OXYGENHUB
# 3b3a51afde59 oxygenhub / crates / hub / src / web / proposals.rs
84.6 KiB · Rust · last changed Proposal lists without rendering every diff; each file's lines computed once 16 days ago source blame history raw
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//! Proposal pages (hub spec §7): list, new, detail with conversation,
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//! changes and files, comments anchored to atoms, reviews, landing.
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use super::history::{render_files, FileRows};
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use super::settings::{csrf, require};
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use super::{filters, lookup, lookup_role, Error, Page, RepoShell, Shell};
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use crate::auth::{Access, Role, Viewer};
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use crate::db::{self, accounts, proposals as pdb};
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use crate::render::{self, diff};
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use crate::repos::proposals::{self as pl, Projection, Source};
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use crate::repos::view::{self, ChangeView, ConflictView};
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use crate::repos::RepoName;
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use crate::Shared;
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use askama::Template;
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use axum::extract::{Form, Path, Query, State};
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use axum::response::{IntoResponse, Redirect, Response};
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use hub_api::{Approval, ProposalSource, ProposalState};
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use oxy_core::hash::ChangeHash;
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use serde::Deserialize;
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use std::collections::{BTreeMap, HashMap};
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// ------------------------------------------------------------------ list
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#[derive(Template)]
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#[template(path = "proposals.html")]
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pub struct ProposalsPage {
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    shell: Shell,
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    repo: RepoShell,
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    rows: Vec<pdb::ProposalRow>,
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    filter: String,
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    counts: (usize, usize, usize),
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    bookmarks: Vec<String>,
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    q: String,
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    sort: String,
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    pager: super::Pager,
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    labels: std::collections::HashMap<i64, Vec<db::issues::Label>>,
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}
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impl ProposalsPage {
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    fn labels_of(&self, id: &i64) -> &[db::issues::Label] {
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        self.labels.get(id).map(Vec::as_slice).unwrap_or(&[])
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    }
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}
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#[derive(Deserialize)]
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pub struct ListQuery {
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    state: Option<String>,
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    q: Option<String>,
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    sort: Option<String>,
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    page: Option<usize>,
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}
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/// The list's sort orders.
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pub const SORTS: &[(&str, &str)] = &[("updated", "recently updated"), ("newest", "newest"), ("oldest", "oldest")];
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pub async fn list(
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    State(app): State<Shared>,
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    viewer: Viewer,
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    Path((owner, name)): Path<(String, String)>,
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    Query(q): Query<ListQuery>,
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) -> Result<Page<ProposalsPage>, Error> {
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    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposals"), &viewer);
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    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
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    let all = pdb::list(&app.db, row.id, &[]).await.map_err(|e| Error::from_db(shell.clone(), e))?;
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    let counts = (
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        all.iter().filter(|p| p.is_open()).count(),
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        all.iter().filter(|p| p.state == "landed").count(),
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        all.iter().filter(|p| p.state == "closed").count(),
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    );
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    let filter = q.state.unwrap_or_else(|| "open".into());
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    let mut labels: std::collections::HashMap<i64, Vec<db::issues::Label>> = std::collections::HashMap::new();
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    for (id, l) in db::issues::labels_by_proposal(&app.db, row.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {
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        labels.entry(id).or_default().push(l);
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    }
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    // `author:bob label:ui target:main words…`
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    let qtext = q.q.clone().unwrap_or_default();
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    let (mut authors, mut wanted, mut targets, mut words) = (vec![], vec![], vec![], vec![]);
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    for tok in qtext.split_whitespace() {
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        match tok.split_once(':') {
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            Some(("author", v)) => authors.push(v.to_lowercase()),
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            Some(("label", v)) => wanted.push(v.to_lowercase()),
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            Some(("target", v)) => targets.push(v.to_string()),
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            _ => words.push(tok.to_lowercase()),
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        }
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    }
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    let mut rows: Vec<pdb::ProposalRow> = all
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        .into_iter()
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        .filter(|p| match filter.as_str() {
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            "open" => p.is_open(),
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            "landed" => p.state == "landed",
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            "closed" => p.state == "closed",
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            _ => true,
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        })
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        .filter(|p| authors.is_empty() || authors.contains(&p.author.to_lowercase()))
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        .filter(|p| targets.is_empty() || targets.contains(&p.target))
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        .filter(|p| wanted.iter().all(|w| labels.get(&p.id).is_some_and(|ls| ls.iter().any(|l| l.name.to_lowercase() == *w))))
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        .filter(|p| words.iter().all(|w| p.title.to_lowercase().contains(w) || p.body.to_lowercase().contains(w)))
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        .collect();
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    let sort = q.sort.filter(|s| SORTS.iter().any(|(k, _)| k == s)).unwrap_or_else(|| "updated".into());
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    match sort.as_str() {
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        "newest" => rows.sort_by_key(|p| std::cmp::Reverse(p.number)),
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        "oldest" => rows.sort_by_key(|p| p.number),
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        _ => rows.sort_by_key(|p| std::cmp::Reverse(p.updated_ms)),
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    }
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    let pager = super::Pager::new(rows.len(), q.page, &[("state", &filter), ("q", &qtext), ("sort", &sort)]);
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    let rows = pager.slice(rows);
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    let bookmarks = app
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        .repos
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        .read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>()))
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        .await
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        .map_err(|e| Error::from_repo(shell.clone(), e))?;
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    Ok(Page(ProposalsPage {
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        shell,
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        repo: RepoShell::new(&app, &row, "proposals").with_role(role),
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        rows,
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        filter,
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        counts,
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        bookmarks,
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        q: qtext,
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        sort,
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        pager,
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        labels,
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    }))
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}
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// ------------------------------------------------------------------- new
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#[derive(Template)]
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#[template(path = "proposal_new.html")]
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pub struct NewProposalPage {
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    shell: Shell,
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    repo: RepoShell,
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    bookmarks: Vec<String>,
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    source: String,
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    target: String,
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    error: Option<String>,
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    /// Preview: the changes the proposal would add.
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    preview: Vec<ChangeView>,
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    conflicted: bool,
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    /// What the form holds so far (after a failed open, or a draft).
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    title: String,
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    body: String,
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    /// AI assistants that may draft the description (hub spec §13.4).
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    assistants: Vec<String>,
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}
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#[derive(Deserialize)]
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pub struct NewQuery {
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    source: Option<String>,
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    target: Option<String>,
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}
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/// `owner/name:bookmark` for a fork, else a bookmark of this repository.
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/// A proposal's source: a bookmark of this repository by name (which may
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/// hold `/`, as `feature/16-hud` does), or `owner/name:bookmark` of a fork;
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/// `owner/name:bookmark` naming this repository is its own bookmark.
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fn parse_source(app: &Shared, repo: &RepoName, source: &str) -> Option<(Option<RepoName>, String)> {
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    let plain = |b: &str| !b.is_empty() && !b.chars().any(|c| c.is_control() || c == ':');
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    if let Some((slug, bookmark)) = source.split_once(':') {
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        let fork = RepoName::parse(slug)?;
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        if !plain(bookmark) {
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            return None;
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        }
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        if fork == *repo {
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            return Some((None, bookmark.to_string()));
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        }
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        if !app.repos.exists(&fork) {
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            return None;
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        }
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        return Some((Some(fork), bookmark.to_string()));
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    }
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    plain(source).then(|| (None, source.to_string()))
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}
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async fn preview_for(
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    app: &Shared,
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    repo: &RepoName,
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    target: &str,
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    source: &str,
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) -> Result<(Vec<ChangeView>, bool), crate::repos::RepoError> {
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    let Some((fork, bookmark)) = parse_source(app, repo, source) else { return Ok((vec![], false)) };
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    let target = target.to_string();
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    let fork_dir = fork.as_ref().map(|f| app.repos.dir(f));
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    app.repos
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        .read(repo, move |r, cache| {
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            let projection = match &fork_dir {
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                Some(dir) => {
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                    let fork_repo = oxy_core::repo::Repo::open(dir)?;
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                    let heads = fork_repo.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
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                    pl::project(r, cache, &target, Source::Fork { fork: &fork_repo, heads })?
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                }
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                None => {
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                    let heads = r.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
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                    pl::project(r, cache, &target, Source::Bookmark(heads))?
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                }
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            };
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            Ok((projection.changes, projection.conflicted))
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        })
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        .await
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}
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pub async fn new_form(
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    State(app): State<Shared>,
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    viewer: Viewer,
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    Path((owner, name)): Path<(String, String)>,
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    Query(q): Query<NewQuery>,
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) -> Result<Page<NewProposalPage>, Error> {
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    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposals/new"), &viewer);
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    require(&viewer, &shell)?;
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    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
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    let bookmarks = app
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        .repos
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        .read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>()))
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        .await
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        .map_err(|e| Error::from_repo(shell.clone(), e))?;
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    let target = q.target.unwrap_or_else(|| row.default_bookmark.clone());
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    let source = q.source.unwrap_or_default();
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    let (preview, conflicted) =
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        if source.is_empty() { (vec![], false) } else { preview_for(&app, &repo, &target, &source).await.unwrap_or((vec![], false)) };
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    let assistants = if preview.is_empty() { vec![] } else { assistant_names(&app, &row).await };
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    Ok(Page(NewProposalPage {
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        shell,
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        repo: RepoShell::new(&app, &row, "proposals").with_role(role),
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        bookmarks,
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        source,
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        target,
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        error: None,
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        preview,
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        conflicted,
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        title: String::new(),
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        body: String::new(),
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        assistants,
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    }))
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}
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#[derive(Deserialize)]
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pub struct NewForm {
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    #[serde(rename = "_csrf")]
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    csrf_token: String,
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    title: String,
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    #[serde(default)]
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    body: String,
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    target: String,
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    source: String,
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    #[serde(default)]
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    draft: Option<String>,
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    /// For `/proposals/new/draft`: which assistant writes the description.
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    #[serde(default)]
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    assistant: String,
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}
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/// Open a proposal from a form or the API: validate, create, index, notify.
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#[allow(clippy::too_many_arguments)]
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pub async fn open_proposal(
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    app: &Shared,
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    repo: &RepoName,
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    row: &db::repos::RepoRow,
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    me: &accounts::Account,
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    title: &str,
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    body: &str,
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    target: &str,
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    source: &str,
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    draft: bool,
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) -> Result<pdb::ProposalRow, String> {
265 
    if title.trim().is_empty() {
266 
        return Err("Give the proposal a title.".into());
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    }
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    let bookmarks =
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        app.repos.read(repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>())).await.map_err(|e| e.to_string())?;
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    if !bookmarks.iter().any(|b| b == target) {
271 
        return Err("Pick a target bookmark of this repository.".into());
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    }
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    let Some((fork, bookmark)) = parse_source(app, repo, source.trim()) else {
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        return Err("The source is a bookmark of this repository, or owner/name:bookmark of a fork.".into());
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    };
276 
    if fork.is_none() && !bookmarks.contains(&bookmark) {
277 
        return Err(format!("There is no bookmark {bookmark} in this repository."));
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    }
279 
    if fork.is_none() && bookmark == target {
280 
        return Err("The source and the target are the same bookmark.".into());
281 
    }
282 
    let (preview, _) = preview_for(app, repo, target, source.trim()).await.map_err(|e| e.to_string())?;
283 
    if preview.is_empty() {
284 
        return Err("The source adds nothing to the target.".into());
285 
    }
286 
    let source_repo_id = match &fork {
287 
        Some(fk) => db::repos::get(&app.db, &fk.owner, &fk.name).await.map_err(|e| e.to_string())?.map(|r| r.id),
288 
        None => None,
289 
    };
290 
    let created = pdb::create(
291 
        &app.db,
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        pdb::NewProposal {
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            repo_id: row.id,
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            title: title.trim(),
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            body: body.trim(),
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            author_id: Some(me.id),
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            author: &me.username,
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            draft,
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            target,
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            source_kind: if fork.is_some() { "fork" } else { "bookmark" },
301 
            source_repo_id,
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            source_bookmark: &bookmark,
303 
            source_changes: "",
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        },
305 
    )
306 
    .await
307 
    .map_err(|e| e.to_string())?;
308 
    pdb::add_event(&app.db, created.id, &me.username, "opened", "").await.ok();
309 
    accounts::audit(&app.db, Some(me), "proposal.opened", &format!("{}#{}", row.slug(), created.number), title).await.ok();
310 
    db::notify::index(&app.db, "proposal", row.id, created.id, created.number, &created.title, &created.body).await.ok();
311 
    let url = format!("/{}/proposal/{}", row.slug(), created.number);
312 
    crate::notify::deliver(
313 
        app,
314 
        crate::notify::Event {
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            kind: "proposal.opened",
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            title: format!("{}#{}: {}", row.slug(), created.number, created.title),
317 
            url,
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            actor: me,
319 
            repo_id: row.id,
320 
            thread: Some(("proposal", created.id)),
321 
            mention_text: body,
322 
            direct: vec![],
323 
        },
324 
    )
325 
    .await;
326 
    crate::hooks::emit(
327 
        app,
328 
        row,
329 
        "proposal.opened",
330 
        &me.username,
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        serde_json::json!({ "number": created.number, "title": created.title, "target": target, "source": source }),
332 
    )
333 
    .await;
334 
    Ok(created)
335 
}
336
337 
pub async fn create(
338 
    State(app): State<Shared>,
339 
    viewer: Viewer,
340 
    Path((owner, name)): Path<(String, String)>,
341 
    Form(f): Form<NewForm>,
342 
) -> Result<Response, Error> {
343 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposals/new"), &viewer);
344 
    let me = require(&viewer, &shell)?;
345 
    csrf(&viewer, &f.csrf_token, &shell)?;
346 
    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
347 
    super::writable(&row, &shell)?;
348 
    match open_proposal(&app, &repo, &row, &me.account, &f.title, &f.body, &f.target, &f.source, f.draft.is_some()).await {
349 
        Ok(created) => Ok(Redirect::to(&format!("/{owner}/{name}/proposal/{}", created.number)).into_response()),
350 
        Err(msg) => {
351 
            let bookmarks =
352 
                app.repos.read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>())).await.unwrap_or_default();
353 
            Ok(Page(NewProposalPage {
354 
                shell,
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                repo: RepoShell::new(&app, &row, "proposals").with_role(role),
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                bookmarks,
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                source: f.source.clone(),
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                target: f.target.clone(),
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                error: Some(msg),
360 
                preview: vec![],
361 
                conflicted: false,
362 
                title: f.title.clone(),
363 
                body: f.body.clone(),
364 
                assistants: vec![],
365 
            })
366 
            .into_response())
367 
        }
368 
    }
369 
}
370
371 
// ---------------------------------------------------------------- detail
372
373 
/// A comment placed on a diff row, or general.
374 
pub struct CommentView {
375 
    pub row: pdb::CommentRow,
376 
    pub body_html: String,
377 
    pub line: Option<usize>,
378 
}
379
380 
/// One entry of a proposal's conversation, in time order: what kind it
381 
/// is and its index in `comments`, `reviews` or `events`.
382 
pub struct Entry {
383 
    pub kind: &'static str,
384 
    pub index: usize,
385 
}
386
387 
pub struct ReviewView {
388 
    pub row: pdb::ReviewRow,
389 
    pub body_html: String,
390 
    pub sealed: bool,
391 
}
392
393 
/// Everything the detail page and the API need, computed once under the lock.
394 
pub struct Loaded {
395 
    pub row: pdb::ProposalRow,
396 
    pub changes: Vec<ChangeView>,
397 
    pub hashes: Vec<ChangeHash>,
398 
    pub heads: Vec<ChangeHash>,
399 
    pub target_heads: Vec<ChangeHash>,
400 
    pub state: String,
401 
    pub target_state: String,
402 
    pub conflicted: bool,
403 
    pub conflicts: Vec<ConflictView>,
404 
    pub files: Vec<FileRows>,
405 
    /// The per-file hunks and bases behind `files`, to render again with other options.
406 
    pub diffs: Vec<oxy_core::repo::FileDiff>,
407 
    pub bases: std::collections::BTreeMap<String, Vec<u8>>,
408 
    /// Atom per (path, new line number) of the projected state.
409 
    pub atoms: HashMap<(String, usize), (String, u32)>,
410 
    pub sealing_keys: Vec<String>,
411 
    pub touched: Vec<String>,
412 
    pub owners: Vec<String>,
413 
    pub landed_already: bool,
414 
    /// Whether its source has any changes at all (#141): an open proposal
415 
    /// whose source has changes, none of them missing from the target, was
416 
    /// landed by some other route.
417 
    pub source_has_changes: bool,
418 
}
419
420 
/// Compute the projection and everything derived from it.
421 
pub async fn load(app: &Shared, repo: &RepoName, row: pdb::ProposalRow) -> Result<Loaded, crate::repos::RepoError> {
422 
    load_with(app, repo, row, true).await
423 
}
424
425 
/// [`load`] without the rendered diff and the line-to-atom map, which only
426 
/// the proposal page needs: for lists, the API, landing and the checks that
427 
/// follow a push. On a repository with large files those two were most of
428 
/// a list's time (metalgear2's took 3-4 s per call).
429 
pub async fn load_summary(app: &Shared, repo: &RepoName, row: pdb::ProposalRow) -> Result<Loaded, crate::repos::RepoError> {
430 
    load_with(app, repo, row, false).await
431 
}
432
433 
async fn load_with(app: &Shared, repo: &RepoName, row: pdb::ProposalRow, render: bool) -> Result<Loaded, crate::repos::RepoError> {
434 
    let fork_dir = match (row.source_kind.as_str(), row.source_repo_id) {
435 
        ("fork", Some(id)) => {
436 
            db::repos::get_by_id(&app.db, id).await.ok().flatten().and_then(|r| RepoName::new(&r.owner, &r.name)).map(|n| app.repos.dir(&n))
437 
        }
438 
        _ => None,
439 
    };
440 
    let r2 = row.clone();
441 
    let loaded = app
442 
        .repos
443 
        .read(repo, move |r, cache| {
444 
            let source = match (r2.source_kind.as_str(), &fork_dir) {
445 
                ("changes", _) => Source::Changes(r2.source_changes().iter().filter_map(|h| ChangeHash::from_hex(h)).collect()),
446 
                ("fork", Some(dir)) => {
447 
                    let fork_repo = oxy_core::repo::Repo::open(dir)?;
448 
                    let heads =
449 
                        fork_repo.bookmarks()?.into_iter().find(|b| b.name == r2.source_bookmark).map(|b| b.heads).unwrap_or_default();
450 
                    // Bring the fork's changes over now, so the projection below can read them.
451 
                    let fork_state = fork_repo.load_state(&heads)?;
452 
                    let missing: Vec<ChangeHash> = fork_state.changes().map(|(h, _)| *h).filter(|h| !r.store().has(h)).collect();
453 
                    if !missing.is_empty() {
454 
                        r.import_bundle(&fork_repo.bundle_for(&missing)?, r.current_policy()?.is_some())?;
455 
                    }
456 
                    Source::Changes(heads)
457 
                }
458 
                _ => {
459 
                    let heads = r.bookmarks()?.into_iter().find(|b| b.name == r2.source_bookmark).map(|b| b.heads).unwrap_or_default();
460 
                    Source::Bookmark(heads)
461 
                }
462 
            };
463 
            let source_has_changes = match &source {
464 
                Source::Changes(h) | Source::Bookmark(h) | Source::Fork { heads: h, .. } => !h.is_empty(),
465 
            };
466 
            let p: Projection = pl::project(r, cache, &r2.target, source)?;
467 
            let target_loaded = cache.load(r, &p.target_heads)?;
468 
            let files = if render { render_files(&p.files, &p.bases) } else { Vec::new() };
469 
            let mut atoms = HashMap::new();
470 
            for f in &files {
471 
                // Each file's live lines once, not once per line.
472 
                let Some(live) = pl::atoms_of(&p.loaded, &f.path) else { continue };
473 
                for l in &f.lines {
474 
                    if let Some((h, i)) = l.new_no.and_then(|n| live.get((n as usize).checked_sub(1)?)) {
475 
                        atoms.insert((f.path.clone(), l.new_no.unwrap_or(0) as usize), (h.to_hex(), *i));
476 
                    }
477 
                }
478 
            }
479 
            let touched: Vec<String> = p.files.iter().map(|f| f.path.clone()).collect();
480 
            let owners = pl::owners_for(&target_loaded, &touched);
481 
            let sealing = pl::sealing_keys(r, &p.hashes)?.into_iter().map(|k| k.to_hex()).collect();
482 
            let landed_already = !p.hashes.is_empty() && p.hashes.iter().all(|h| target_loaded.state.contains(h));
483 
            // A landed proposal's changes are in its target now: it shows
484 
            // the ones it landed, as recorded when it landed.
485 
            let (changes, hashes) = if r2.state == "landed" && p.hashes.is_empty() {
486 
                let hashes: Vec<ChangeHash> = r2.projected_changes().iter().filter_map(|h| ChangeHash::from_hex(h)).collect();
487 
                let labels = HashMap::new();
488 
                let changes = hashes
489 
                    .iter()
490 
                    .filter_map(|h| Some(view::change_view_pub(r, h, &r.store().get_change_meta(h).ok()?, false, &labels)))
491 
                    .collect();
492 
                (changes, hashes)
493 
            } else {
494 
                (p.changes, p.hashes)
495 
            };
496 
            Ok(Loaded {
497 
                row: r2,
498 
                changes,
499 
                hashes,
500 
                heads: p.heads,
501 
                target_heads: p.target_heads.clone(),
502 
                state: p.state.to_hex(),
503 
                target_state: p.target_state.to_hex(),
504 
                conflicted: p.conflicted,
505 
                conflicts: p.conflicts,
506 
                files,
507 
                diffs: p.files.clone(),
508 
                bases: p.bases.clone(),
509 
                atoms,
510 
                sealing_keys: sealing,
511 
                touched,
512 
                owners,
513 
                landed_already,
514 
                source_has_changes,
515 
            })
516 
        })
517 
        .await?;
518 
    // Landed by another route (#141): `oxy proposal land` from a client (a
519 
    // repository with a trust policy needs it), or the work merged and
520 
    // pushed by hand. Everything it proposes is in its target, so it is
521 
    // landed, not open with nothing to land.
522 
    let mut loaded = loaded;
523 
    if loaded.row.is_open()
524 
        && loaded.source_has_changes
525 
        && loaded.hashes.is_empty()
526 
        && pdb::set_landed(&app.db, loaded.row.id, &loaded.target_state, "", "push").await.is_ok()
527 
    {
528 
        loaded.row.state = "landed".into();
529 
        loaded.row.landed_via = "push".into();
530 
        loaded.row.landed_state = loaded.target_state.clone();
531 
        return Ok(loaded);
532 
    }
533 
    // Remember the projection for the list, the API and other proposals'
534 
    // stacking checks, while the proposal is open: a landed one keeps what
535 
    // it landed.
536 
    if !loaded.row.is_open() {
537 
        return Ok(loaded);
538 
    }
539 
    let heads_csv = loaded.heads.iter().map(|h| h.to_hex()).collect::<Vec<_>>().join(",");
540 
    let changes_csv = loaded.hashes.iter().map(|h| h.to_hex()).collect::<Vec<_>>().join(",");
541 
    pdb::set_projection(&app.db, loaded.row.id, &loaded.state, &heads_csv, &loaded.target_state, &changes_csv, loaded.conflicted)
542 
        .await
543 
        .ok();
544 
    Ok(loaded)
545 
}
546
547 
/// After a push moved `bookmark`: open proposals into it whose work it now
548 
/// holds are marked landed, by the pusher (#141).
549 
pub async fn settle_after_push(app: &Shared, row: &db::repos::RepoRow, bookmark: &str, actor: &str) {
550 
    let Some(repo) = RepoName::new(&row.owner, &row.name) else { return };
551 
    let Ok(open) = pdb::list(&app.db, row.id, &["open", "draft"]).await else { return };
552 
    for p in open.into_iter().filter(|p| p.target == bookmark) {
553 
        let id = p.id;
554 
        let number = p.number;
555 
        if let Ok(l) = load_summary(app, &repo, p).await {
556 
            if l.row.state == "landed" && l.row.landed_by.is_empty() {
557 
                pdb::set_landed(&app.db, id, &l.target_state, actor, "push").await.ok();
558 
            } else if l.row.is_open() && !l.hashes.is_empty() && crate::flow::enabled(app, row) {
559 
                // The target moved, so the proposal's projected state is
560 
                // new and its checks would be for an older one (#134): run
561 
                // the pipeline on it, once.
562 
                let ran: i64 = sqlx::query_scalar("SELECT COUNT(*) FROM flow_runs WHERE repo_id = $1 AND state = $2")
563 
                    .bind(row.id)
564 
                    .bind(&l.state)
565 
                    .fetch_one(&app.db)
566 
                    .await
567 
                    .unwrap_or(1);
568 
                if ran == 0 {
569 
                    let label = format!("proposal/{number}");
570 
                    match crate::flow::start_run_scoped(app, row, &label, &l.state, &l.heads, actor, "proposal", None).await {
571 
                        Ok(Some(n)) => tracing::info!("proposal {number}: its target moved; run #{n} checks its new projected state"),
572 
                        Ok(None) => {}
573 
                        Err(e) => tracing::warn!("proposal {number}: a run of its new projected state did not start: {e}"),
574 
                    }
575 
                }
576 
            }
577 
        }
578 
    }
579 
}
580
581 
/// Reviews, approvals and blockers.
582 
pub struct Verdict {
583 
    pub reviews: Vec<ReviewView>,
584 
    pub approvals: Vec<Approval>,
585 
    pub blockers: Vec<String>,
586 
    /// The required-checks blocker, also in `blockers`: the one a
587 
    /// maintainer may land over with a reason (#261).
588 
    pub checks_blocker: Option<String>,
589 
    pub depends_on: Vec<i64>,
590 
    pub requirements: pdb::Requirements,
591 
}
592
593 
pub async fn verdict(app: &Shared, loaded: &Loaded, repo_id: i64) -> Result<Verdict, sqlx::Error> {
594 
    let rows = pdb::reviews(&app.db, loaded.row.id).await?;
595 
    let links = accounts::identity_accounts(&app.db).await?;
596 
    let sealed_accounts: Vec<String> = links.iter().filter(|(k, _)| loaded.sealing_keys.contains(k)).map(|(_, u)| u.clone()).collect();
597 
    // Latest verdict per reviewer.
598 
    let mut latest: BTreeMap<String, &pdb::ReviewRow> = BTreeMap::new();
599 
    for r in rows.iter().filter(|r| r.via.is_empty()) {
600 
        // An assistant's answer is never the person's own verdict.
601 
        latest.insert(r.author.clone(), r);
602 
    }
603 
    let mut approvals = Vec::new();
604 
    for (who, r) in &latest {
605 
        if r.verdict == "approve" {
606 
            let sealed = sealed_accounts.contains(who);
607 
            let key = links.iter().find(|(k, u)| u == who && loaded.sealing_keys.contains(k)).map(|(k, _)| k.clone());
608 
            approvals.push(Approval { account: who.clone(), sealed, key });
609 
        }
610 
    }
611 
    let reviews = rows
612 
        .iter()
613 
        .map(|r| ReviewView {
614 
            row: r.clone(),
615 
            body_html: render::markdown::render(&r.body, "/", "/"),
616 
            sealed: r.verdict == "approve" && sealed_accounts.contains(&r.author),
617 
        })
618 
        .collect();
619 
    let requirements = pdb::requirements(&app.db, repo_id).await?;
620 
    let mut blockers = Vec::new();
621 
    // Only an open proposal can be held back.
622 
    if !loaded.row.is_open() {
623 
        return Ok(Verdict { reviews, approvals, blockers, checks_blocker: None, depends_on: vec![], requirements });
624 
    }
625 
    if loaded.row.state == "draft" {
626 
        blockers.push("the proposal is a draft".into());
627 
    }
628 
    if loaded.hashes.is_empty() {
629 
        blockers.push("the proposal adds no changes".into());
630 
    }
631 
    let sealed_count = approvals.iter().filter(|a| a.sealed).count() as i64;
632 
    if sealed_count < requirements.required_approvals {
633 
        blockers.push(format!("{sealed_count} of {} required sealed approvals", requirements.required_approvals));
634 
    }
635 
    if requirements.require_owners {
636 
        let missing: Vec<&String> = loaded.owners.iter().filter(|o| !approvals.iter().any(|a| a.sealed && &a.account == *o)).collect();
637 
        if !missing.is_empty() {
638 
            blockers.push(format!("code owners still to approve: {}", missing.iter().map(|s| s.as_str()).collect::<Vec<_>>().join(", ")));
639 
        }
640 
    }
641 
    if loaded.conflicted && !requirements.allow_conflicts {
642 
        blockers.push("landing would carry conflicts, which this repository refuses".into());
643 
    }
644 
    let mut checks_blocker = None;
645 
    let required = db::hooks::required_checks(&app.db, repo_id).await?;
646 
    if !required.is_empty() {
647 
        let checks = db::hooks::checks_for_state(&app.db, repo_id, &loaded.state).await?;
648 
        let missing: Vec<String> =
649 
            required.iter().filter(|n| !checks.iter().any(|c| &c.name == *n && c.status == "passed")).cloned().collect();
650 
        if !missing.is_empty() {
651 
            let b = format!("required checks not passed on the projected state: {}", missing.join(", "));
652 
            checks_blocker = Some(b.clone());
653 
            blockers.push(b);
654 
        }
655 
    }
656 
    let requesting: Vec<&String> = latest.iter().filter(|(_, r)| r.verdict == "changes").map(|(who, _)| who).collect();
657 
    if !requesting.is_empty() {
658 
        blockers.push(format!("changes requested by {}", requesting.iter().map(|s| s.as_str()).collect::<Vec<_>>().join(", ")));
659 
    }
660 
    // Stacking: another open, earlier proposal whose changes this one includes.
661 
    let mut depends_on = Vec::new();
662 
    for other in pdb::list(&app.db, repo_id, &["open", "draft"]).await? {
663 
        if other.id == loaded.row.id || other.number > loaded.row.number {
664 
            continue;
665 
        }
666 
        let theirs = other.projected_changes();
667 
        if !theirs.is_empty() && theirs.iter().all(|h| loaded.hashes.iter().any(|m| m.to_hex() == *h)) {
668 
            depends_on.push(other.number);
669 
        }
670 
    }
671 
    if !depends_on.is_empty() {
672 
        blockers.push(format!("depends on {}", depends_on.iter().map(|n| format!("#{n}")).collect::<Vec<_>>().join(", ")));
673 
    }
674 
    Ok(Verdict { reviews, approvals, blockers, checks_blocker, depends_on, requirements })
675 
}
676
677 
#[derive(Template)]
678 
#[template(path = "proposal.html")]
679 
pub struct ProposalPage {
680 
    shell: Shell,
681 
    repo: RepoShell,
682 
    p: pdb::ProposalRow,
683 
    /// Live topics (oxygenhub#205): the proposal's and its repository's
684 
    /// (checks arrive on the latter).
685 
    live_topic: String,
686 
    repo_topic: String,
687 
    /// Assistants answering now: shown as pending until they do.
688 
    pending: Vec<String>,
689 
    /// Issues it closes, from its description and its changes.
690 
    closes: Vec<super::chain::Link>,
691 
    /// Projects the viewer may add it to.
692 
    project_choices: Option<Vec<db::projects::Project>>,
693 
    /// Comments (not anchored to a line), reviews and events, oldest first.
694 
    timeline: Vec<Entry>,
695 
    /// The viewer may set labels (triage or above).
696 
    can_triage: bool,
697 
    body_html: String,
698 
    tab: String,
699 
    changes: Vec<ChangeView>,
700 
    files: Vec<FileRows>,
701 
    diffs: Vec<oxy_core::repo::FileDiff>,
702 
    bases: std::collections::BTreeMap<String, Vec<u8>>,
703 
    /// Whitespace-only changes are hidden (`?w=1`).
704 
    ignore_ws: bool,
705 
    conflicts: Vec<ConflictView>,
706 
    conflicted: bool,
707 
    comments: Vec<CommentView>,
708 
    /// Anchored comments by (path, current line).
709 
    placed: HashMap<(String, usize), Vec<usize>>,
710 
    outdated: Vec<usize>,
711 
    reviews: Vec<ReviewView>,
712 
    approvals: Vec<Approval>,
713 
    blockers: Vec<String>,
714 
    depends_on: Vec<i64>,
715 
    events: Vec<pdb::EventRow>,
716 
    owners: Vec<String>,
717 
    requirements: pdb::Requirements,
718 
    landed_already: bool,
719 
    can_edit: bool,
720 
    /// The landed proposal's source bookmark, when it is this repository's,
721 
    /// still there, and the viewer may delete it (oxygenhub#86).
722 
    deletable_source: Option<String>,
723 
    can_land: bool,
724 
    can_land_over_checks: bool,
725 
    can_auto_land: bool,
726 
    hub_can_land: bool,
727 
    notice: Option<String>,
728 
    error: Option<String>,
729 
    heads: Vec<String>,
730 
    state_hash: String,
731 
    source_label: String,
732 
    api_url: String,
733 
    labels: Vec<db::issues::Label>,
734 
    all_labels: Vec<db::issues::Label>,
735 
    checks: Vec<db::hooks::Check>,
736 
    required_checks: Vec<String>,
737 
    /// Projects this proposal is on that the viewer may see, with the column.
738 
    projects: Vec<(db::projects::Project, String)>,
739 
    /// Asked to review and not yet reviewing.
740 
    requested: Vec<String>,
741 
    /// Who can be asked to review, for the sidebar's menu (oxygenhub#84).
742 
    reviewable: Vec<String>,
743 
    /// The viewer may ask for reviews (the author, or a writer).
744 
    can_request: bool,
745 
    /// AI assistants the viewer may ask, by name (hub spec §13.4).
746 
    assistants: Vec<String>,
747 
    /// A description an assistant just drafted, for the editor.
748 
    draft: Option<String>,
749 
}
750
751 
#[derive(Deserialize)]
752 
pub struct DetailQuery {
753 
    tab: Option<String>,
754 
    /// What an action said, after it redirected here.
755 
    #[serde(default)]
756 
    notice: Option<String>,
757 
    #[serde(default)]
758 
    error: Option<String>,
759 
    #[serde(default)]
760 
    w: Option<String>,
761 
    /// Only this part of the page (live pages, oxygenhub#205).
762 
    #[serde(default)]
763 
    fragment: Option<String>,
764 
}
765
766 
/// The page assembler every action ends in; its arguments are the route
767 
/// plus what to say, and a struct would only rename them.
768 
#[allow(clippy::too_many_arguments)]
769 
async fn detail(
770 
    app: &Shared,
771 
    shell: Shell,
772 
    viewer: &Viewer,
773 
    owner: &str,
774 
    name: &str,
775 
    number: i64,
776 
    tab: String,
777 
    notice: Option<String>,
778 
    error: Option<String>,
779 
) -> Result<Page<ProposalPage>, Error> {
780 
    let (repo, row, role) = lookup(app, &shell, viewer, owner, name).await?;
781 
    let p = pdb::get(&app.db, row.id, number)
782 
        .await
783 
        .map_err(|e| Error::from_db(shell.clone(), e))?
784 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
785 
    let p_id = p.id;
786 
    let loaded = load(app, &repo, p).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
787 
    // A proposal whose changes all reached the target landed by another route.
788 
    if loaded.landed_already && loaded.row.is_open() {
789 
        pdb::set_state(&app.db, loaded.row.id, "landed", &loaded.target_state).await.ok();
790 
        pdb::add_event(&app.db, loaded.row.id, "", "landed", "every change reached the target").await.ok();
791 
    }
792 
    let p = pdb::get(&app.db, row.id, number).await.map_err(|e| Error::from_db(shell.clone(), e))?.unwrap_or(loaded.row.clone());
793 
    let v = verdict(app, &loaded, row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
794 
    let comment_rows = pdb::comments(&app.db, loaded.row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
795 
    let events = pdb::events(&app.db, loaded.row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
796 
    // Place anchored comments at their atom's current line.
797 
    let mut by_atom: HashMap<(String, String, u32), usize> = HashMap::new();
798 
    for ((path, line), (h, i)) in &loaded.atoms {
799 
        by_atom.insert((path.clone(), h.clone(), *i), *line);
800 
    }
801 
    let mut comments = Vec::new();
802 
    let mut placed: HashMap<(String, usize), Vec<usize>> = HashMap::new();
803 
    let mut outdated = Vec::new();
804 
    for (idx, c) in comment_rows.into_iter().enumerate() {
805 
        let line = if c.anchor_change.is_empty() {
806 
            None
807 
        } else {
808 
            by_atom.get(&(c.path.clone(), c.anchor_change.clone(), c.anchor_index as u32)).copied()
809 
        };
810 
        if !c.anchor_change.is_empty() {
811 
            match line {
812 
                Some(l) => placed.entry((c.path.clone(), l)).or_default().push(idx),
813 
                None => outdated.push(idx),
814 
            }
815 
        }
816 
        comments.push(CommentView { body_html: render::markdown::render(&c.body, "/", "/"), row: c, line });
817 
    }
818 
    let mut changes = loaded.changes.clone();
819 
    super::attribute(app, &mut changes.iter_mut().collect::<Vec<_>>()).await;
820 
    let me = viewer.account();
821 
    let can_edit = me.is_some_and(|a| Some(a.id) == p.author_id || role >= Role::Maintain);
822 
    let deletable_source =
823 
        if p.state == "landed" && p.source_kind == "bookmark" && role >= Role::Write && p.source_bookmark != row.default_bookmark {
824 
            let b = p.source_bookmark.clone();
825 
            app.repos
826 
                .read(&repo, move |r, _| Ok(r.view()?.bookmarks.contains_key(&b)))
827 
                .await
828 
                .unwrap_or(false)
829 
                .then(|| p.source_bookmark.clone())
830 
        } else {
831 
            None
832 
        };
833 
    let can_land = role >= Role::Write && p.is_open() && v.blockers.is_empty();
834 
    // Not landable yet: anyone who may land can set it to land when its
835 
    // checks pass (#261).
836 
    let can_auto_land = role >= Role::Write && p.is_open() && !v.blockers.is_empty();
837 
    // Checks alone in the way: a maintainer may land over them (#261).
838 
    let can_land_over_checks = role >= Role::Maintain && p.is_open() && v.checks_blocker.is_some() && v.blockers.len() == 1;
839 
    let can_request = p.is_open() && me.is_some_and(|a| Some(a.id) == p.author_id || role >= Role::Write);
840 
    let requested = pdb::review_requests(&app.db, p.id).await.unwrap_or_default();
841 
    let mut reviewable: Vec<String> = if can_request {
842 
        accounts::assignable(&app.db, row.id, &row.owner).await.unwrap_or_default().into_iter().filter(|u| *u != p.author).collect()
843 
    } else {
844 
        Vec::new()
845 
    };
846 
    for r in &requested {
847 
        if !reviewable.iter().any(|x| x.eq_ignore_ascii_case(r)) {
848 
            reviewable.push(r.clone());
849 
        }
850 
    }
851 
    let assistants: Vec<String> = if (can_request || can_edit) && p.is_open() { assistant_names(app, &row).await } else { Vec::new() };
852 
    let delegated = match viewer.account() {
853 
        Some(a) => super::edit::delegated_identity(app, a.id).await.is_some(),
854 
        None => false,
855 
    };
856 
    let hub_can_land = delegated || app.repos.read(&repo, |r, _| Ok(r.current_policy()?.is_none())).await.unwrap_or(false);
857 
    let source_label = match p.source_kind.as_str() {
858 
        "fork" => format!(
859 
            "fork {}",
860 
            db::repos::get_by_id(&app.db, p.source_repo_id.unwrap_or(0))
861 
                .await
862 
                .ok()
863 
                .flatten()
864 
                .map(|r| format!("{}:{}", r.slug(), p.source_bookmark))
865 
                .unwrap_or_default()
866 
        ),
867 
        "changes" => format!("{} changes", p.source_changes().len()),
868 
        _ => p.source_bookmark.clone(),
869 
    };
870 
    let projects = super::projects::placements_for(app, viewer, &row, p.number).await;
871 
    let texts: Vec<String> = std::iter::once(p.body.clone()).chain(changes.iter().map(|c| format!("{}\n{}", c.title, c.body))).collect();
872 
    let closes = super::chain::issues_closed_by(app, &row, &texts.iter().map(String::as_str).collect::<Vec<_>>()).await;
873 
    let project_choices = super::projects::project_choices(app, viewer, &row, &projects).await;
874 
    let mut dated: Vec<(i64, Entry)> = Vec::new();
875 
    for (index, c) in comments.iter().enumerate() {
876 
        if c.row.anchor_change.is_empty() {
877 
            dated.push((c.row.created_ms, Entry { kind: "comment", index }));
878 
        }
879 
    }
880 
    for (index, r) in v.reviews.iter().enumerate() {
881 
        dated.push((r.row.created_ms, Entry { kind: "review", index }));
882 
    }
883 
    for (index, e) in events.iter().enumerate() {
884 
        dated.push((e.at_ms, Entry { kind: "event", index }));
885 
    }
886 
    dated.sort_by_key(|(at, _)| *at);
887 
    let timeline: Vec<Entry> = dated.into_iter().map(|(_, e)| e).collect();
888 
    let pending = app.assistant_gate.lock().unwrap_or_else(|e| e.into_inner()).answering(p_id);
889 
    Ok(Page(ProposalPage {
890 
        live_topic: crate::events::topic::proposal(row.id, number),
891 
        repo_topic: crate::events::topic::repo(row.id),
892 
        pending,
893 
        can_triage: role >= Role::Triage,
894 
        timeline,
895 
        closes,
896 
        project_choices,
897 
        projects,
898 
        shell,
899 
        repo: RepoShell::new(app, &row, "proposals").with_role(role).with_sky(app, &row).await,
900 
        body_html: super::issues::markdown(app, &row, &row.default_bookmark, &p.body).await,
901 
        p,
902 
        tab,
903 
        changes,
904 
        files: loaded.files,
905 
        diffs: loaded.diffs,
906 
        bases: loaded.bases,
907 
        ignore_ws: false,
908 
        conflicts: loaded.conflicts,
909 
        conflicted: loaded.conflicted,
910 
        comments,
911 
        placed,
912 
        outdated,
913 
        reviews: v.reviews,
914 
        approvals: v.approvals,
915 
        blockers: v.blockers,
916 
        depends_on: v.depends_on,
917 
        events,
918 
        owners: loaded.owners,
919 
        requirements: v.requirements,
920 
        landed_already: loaded.landed_already,
921 
        can_edit,
922 
        deletable_source,
923 
        can_land,
924 
        can_land_over_checks,
925 
        can_auto_land,
926 
        hub_can_land,
927 
        notice,
928 
        error,
929 
        heads: loaded.heads.iter().map(|h| h.to_hex()).collect(),
930 
        state_hash: loaded.state.clone(),
931 
        source_label,
932 
        api_url: format!("{}/api/v1/repos/{owner}/{name}/proposals/{number}", app.config.base_url()),
933 
        labels: db::issues::proposal_labels(&app.db, loaded.row.id).await.unwrap_or_default(),
934 
        all_labels: db::issues::labels(&app.db, row.id).await.unwrap_or_default(),
935 
        checks: db::hooks::checks_for_state(&app.db, row.id, &loaded.state).await.unwrap_or_default(),
936 
        required_checks: db::hooks::required_checks(&app.db, row.id).await.unwrap_or_default(),
937 
        requested,
938 
        reviewable,
939 
        assistants,
940 
        draft: None,
941 
        can_request,
942 
    }))
943 
}
944
945 
/// Back to the proposal after an action, with what to say: a redirect, so
946 
/// reloading the page (the checks script does) never repeats the action.
947 
fn back(owner: &str, name: &str, number: i64, tab: &str, notice: Option<String>, error: Option<String>) -> Response {
948 
    let mut url = format!("/{owner}/{name}/proposal/{number}?tab={tab}");
949 
    if let Some(n) = notice {
950 
        url.push_str(&format!("&notice={}", super::settings::urlencode(&n)));
951 
    }
952 
    if let Some(e) = error {
953 
        url.push_str(&format!("&error={}", super::settings::urlencode(&e)));
954 
    }
955 
    Redirect::to(&url).into_response()
956 
}
957
958 
pub async fn show(
959 
    State(app): State<Shared>,
960 
    viewer: Viewer,
961 
    Path((owner, name, number)): Path<(String, String, i64)>,
962 
    Query(q): Query<DetailQuery>,
963 
) -> Result<Response, Error> {
964 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
965 
    let mut page =
966 
        detail(&app, shell, &viewer, &owner, &name, number, q.tab.unwrap_or_else(|| "conversation".into()), q.notice, q.error).await?;
967 
    if q.w.as_deref() == Some("1") {
968 
        // Hide whitespace-only changes: the same hunks, rendered again.
969 
        page.0.files =
970 
            super::history::render_files_with(&page.0.diffs, &page.0.bases, crate::render::diff::Options { ignore_whitespace: true });
971 
        page.0.ignore_ws = true;
972 
    }
973 
    // A live page asks for one part again (oxygenhub#205): rendered by the
974 
    // same route, so the same access, and cut from the whole.
975 
    if let Some(name) = q.fragment.as_deref() {
976 
        let html = page.0.render().map_err(|e| Error::bad(page.0.shell.clone(), e.to_string()))?;
977 
        return Ok(match super::fragment(&html, name) {
978 
            Some(part) => ([(axum::http::header::CACHE_CONTROL, "no-store")], axum::response::Html(part)).into_response(),
979 
            None => (axum::http::StatusCode::NOT_FOUND, "no such fragment").into_response(),
980 
        });
981 
    }
982 
    Ok(page.into_response())
983 
}
984
985 
// ---------------------------------------------------------------- actions
986
987 
#[derive(Deserialize)]
988 
pub struct CommentForm {
989 
    #[serde(rename = "_csrf")]
990 
    csrf_token: String,
991 
    body: String,
992 
    #[serde(default)]
993 
    path: String,
994 
    #[serde(default)]
995 
    line: Option<usize>,
996 
}
997
998 
pub async fn comment(
999 
    State(app): State<Shared>,
1000 
    viewer: Viewer,
1001 
    Path((owner, name, number)): Path<(String, String, i64)>,
1002 
    Form(f): Form<CommentForm>,
1003 
) -> Result<Response, Error> {
1004 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1005 
    let me = require(&viewer, &shell)?;
1006 
    csrf(&viewer, &f.csrf_token, &shell)?;
1007 
    let (repo, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1008 
    super::writable(&row, &shell)?;
1009 
    let p = pdb::get(&app.db, row.id, number)
1010 
        .await
1011 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1012 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1013 
    if f.body.trim().is_empty() {
1014 
        return Ok(back(&owner, &name, number, "conversation", None, Some("An empty comment says nothing.".into())));
1015 
    }
1016 
    let anchor = match (f.path.trim(), f.line) {
1017 
        ("", _) | (_, None) => None,
1018 
        (path, Some(line)) => {
1019 
            let loaded = load(&app, &repo, p.clone()).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
1020 
            loaded.atoms.get(&(path.to_string(), line)).cloned()
1021 
        }
1022 
    };
1023 
    let tab = if anchor.is_some() { "files" } else { "conversation" };
1024 
    pdb::add_comment(
1025 
        &app.db,
1026 
        p.id,
1027 
        Some(me.account.id),
1028 
        &me.account.username,
1029 
        f.body.trim(),
1030 
        f.path.trim(),
1031 
        anchor.as_ref().map(|(h, i)| (h.as_str(), *i as i64)),
1032 
    )
1033 
    .await
1034 
    .map_err(|e| Error::from_db(shell.clone(), e))?;
1035 
    app.bus.live(&crate::events::topic::proposal(row.id, number), "comment");
1036 
    Ok(back(&owner, &name, number, tab, None, None))
1037 
}
1038
1039 
#[derive(Deserialize)]
1040 
pub struct ReviewForm {
1041 
    #[serde(rename = "_csrf")]
1042 
    csrf_token: String,
1043 
    verdict: String,
1044 
    #[serde(default)]
1045 
    body: String,
1046 
}
1047
1048 
pub async fn review(
1049 
    State(app): State<Shared>,
1050 
    viewer: Viewer,
1051 
    Path((owner, name, number)): Path<(String, String, i64)>,
1052 
    Form(f): Form<ReviewForm>,
1053 
) -> Result<Response, Error> {
1054 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1055 
    let me = require(&viewer, &shell)?;
1056 
    csrf(&viewer, &f.csrf_token, &shell)?;
1057 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1058 
    super::writable(&row, &shell)?;
1059 
    let p = pdb::get(&app.db, row.id, number)
1060 
        .await
1061 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1062 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1063 
    if !matches!(f.verdict.as_str(), "comment" | "changes" | "approve") {
1064 
        return Err(Error::bad(shell, "a review is comment, changes or approve"));
1065 
    }
1066 
    if f.verdict == "approve" && Some(me.account.id) == p.author_id {
1067 
        return Ok(back(&owner, &name, number, "conversation", None, Some("You cannot approve your own proposal.".into())));
1068 
    }
1069 
    pdb::add_review(&app.db, p.id, me.account.id, &me.account.username, &f.verdict, f.body.trim())
1070 
        .await
1071 
        .map_err(|e| Error::from_db(shell.clone(), e))?;
1072 
    pdb::add_event(&app.db, p.id, &me.account.username, &format!("review.{}", f.verdict), "").await.ok();
1073 
    reviewed(&app, &row, &p, &me.account, &f.verdict).await;
1074 
    crate::hooks::emit(&app, &row, "review", &me.account.username, serde_json::json!({ "number": number, "verdict": f.verdict })).await;
1075 
    let notice = if f.verdict == "approve" {
1076 
        Some(format!(
1077 
            "Approval recorded. It counts once you seal the changes: oxy seal --proposal {}/{owner}/{name}/proposal/{number}",
1078 
            app.config.base_url()
1079 
        ))
1080 
    } else {
1081 
        None
1082 
    };
1083 
    Ok(back(&owner, &name, number, "conversation", notice, None))
1084 
}
1085
1086 
#[derive(Deserialize)]
1087 
pub struct EditForm {
1088 
    #[serde(rename = "_csrf")]
1089 
    csrf_token: String,
1090 
    title: String,
1091 
    #[serde(default)]
1092 
    body: String,
1093 
    target: String,
1094 
}
1095
1096 
pub async fn edit(
1097 
    State(app): State<Shared>,
1098 
    viewer: Viewer,
1099 
    Path((owner, name, number)): Path<(String, String, i64)>,
1100 
    Form(f): Form<EditForm>,
1101 
) -> Result<Response, Error> {
1102 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1103 
    let me = require(&viewer, &shell)?;
1104 
    csrf(&viewer, &f.csrf_token, &shell)?;
1105 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1106 
    let p = pdb::get(&app.db, row.id, number)
1107 
        .await
1108 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1109 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1110 
    if Some(me.account.id) != p.author_id && role < Role::Maintain {
1111 
        return Err(Error::not_found(shell));
1112 
    }
1113 
    let target = if crate::repos::names::valid_segment(f.target.trim()) { f.target.trim() } else { &p.target };
1114 
    pdb::edit(&app.db, p.id, f.title.trim(), f.body.trim(), target).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1115 
    pdb::add_event(&app.db, p.id, &me.account.username, "edited", "").await.ok();
1116 
    Ok(back(&owner, &name, number, "conversation", Some("Saved.".into()), None))
1117 
}
1118
1119 
#[derive(Deserialize)]
1120 
pub struct StateForm {
1121 
    #[serde(rename = "_csrf")]
1122 
    csrf_token: String,
1123 
    action: String,
1124 
}
1125
1126 
pub async fn state(
1127 
    State(app): State<Shared>,
1128 
    viewer: Viewer,
1129 
    Path((owner, name, number)): Path<(String, String, i64)>,
1130 
    Form(f): Form<StateForm>,
1131 
) -> Result<Response, Error> {
1132 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1133 
    let me = require(&viewer, &shell)?;
1134 
    csrf(&viewer, &f.csrf_token, &shell)?;
1135 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1136 
    let p = pdb::get(&app.db, row.id, number)
1137 
        .await
1138 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1139 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1140 
    if Some(me.account.id) != p.author_id && role < Role::Triage {
1141 
        return Err(Error::not_found(shell));
1142 
    }
1143 
    let new_state = match (f.action.as_str(), p.state.as_str()) {
1144 
        ("close", "open" | "draft") => "closed",
1145 
        ("reopen", "closed") => "open",
1146 
        ("ready", "draft") => "open",
1147 
        ("draft", "open") => "draft",
1148 
        _ => return Err(Error::bad(shell, "that transition is not possible")),
1149 
    };
1150 
    pdb::set_state(&app.db, p.id, new_state, "").await.map_err(|e| Error::from_db(shell.clone(), e))?;
1151 
    pdb::add_event(&app.db, p.id, &me.account.username, new_state, "").await.ok();
1152 
    crate::hooks::emit(&app, &row, &format!("proposal.{new_state}"), &me.account.username, serde_json::json!({ "number": number })).await;
1153 
    Ok(back(&owner, &name, number, "conversation", None, None))
1154 
}
1155
1156 
pub async fn resolve_comment(
1157 
    State(app): State<Shared>,
1158 
    viewer: Viewer,
1159 
    Path((owner, name, number, id)): Path<(String, String, i64, i64)>,
1160 
    Form(f): Form<super::session::CsrfForm>,
1161 
) -> Result<Response, Error> {
1162 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1163 
    require(&viewer, &shell)?;
1164 
    csrf(&viewer, &f.csrf, &shell)?;
1165 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1166 
    let p = pdb::get(&app.db, row.id, number)
1167 
        .await
1168 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1169 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1170 
    let current: Option<bool> = sqlx::query_scalar("SELECT resolved FROM proposal_comments WHERE id = $1 AND proposal_id = $2")
1171 
        .bind(id)
1172 
        .bind(p.id)
1173 
        .fetch_optional(&app.db)
1174 
        .await
1175 
        .map_err(|e| Error::from_db(shell.clone(), e))?;
1176 
    if let Some(r) = current {
1177 
        pdb::set_comment_resolved(&app.db, id, !r).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1178 
    }
1179 
    Ok(back(&owner, &name, number, "files", None, None))
1180 
}
1181
1182 
/// Land from the hub: only when the repository has no trust policy (the
1183 
/// hub never signs a reference update the policy would have to admit).
1184 
#[derive(serde::Deserialize)]
1185 
pub struct LandForm {
1186 
    #[serde(rename = "_csrf")]
1187 
    csrf: String,
1188 
    /// Why it lands over its required checks (#261), for maintainers.
1189 
    #[serde(default)]
1190 
    over_checks: Option<String>,
1191 
}
1192
1193 
pub async fn land(
1194 
    State(app): State<Shared>,
1195 
    viewer: Viewer,
1196 
    Path((owner, name, number)): Path<(String, String, i64)>,
1197 
    Form(f): Form<LandForm>,
1198 
) -> Result<Response, Error> {
1199 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1200 
    let me = require(&viewer, &shell)?;
1201 
    csrf(&viewer, &f.csrf, &shell)?;
1202 
    let need = if f.over_checks.is_some() { Access::Maintain } else { Access::Write };
1203 
    let (repo, row, _) = lookup_role(&app, &shell, &viewer, &owner, &name, need).await?;
1204 
    match land_as(&app, &repo, &row, &me.account, number, "web", false, f.over_checks.as_deref()).await {
1205 
        Ok(_) => Ok(back(&owner, &name, number, "conversation", Some("Landed.".into()), None)),
1206 
        Err(Landing::NotFound) => Err(Error::not_found(shell)),
1207 
        Err(Landing::Refused(m)) => Ok(back(&owner, &name, number, "conversation", None, Some(m))),
1208 
    }
1209 
}
1210
1211 
#[derive(serde::Deserialize)]
1212 
pub struct AutoLandForm {
1213 
    #[serde(rename = "_csrf")]
1214 
    csrf: String,
1215 
    /// `1` to set it, else off.
1216 
    #[serde(default)]
1217 
    on: String,
1218 
}
1219
1220 
/// `POST …/proposal/{n}/auto-land` (#261): land when its checks pass, set
1221 
/// or cleared by someone who may land it.
1222 
pub async fn auto_land(
1223 
    State(app): State<Shared>,
1224 
    viewer: Viewer,
1225 
    Path((owner, name, number)): Path<(String, String, i64)>,
1226 
    Form(f): Form<AutoLandForm>,
1227 
) -> Result<Response, Error> {
1228 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1229 
    let me = require(&viewer, &shell)?;
1230 
    csrf(&viewer, &f.csrf, &shell)?;
1231 
    let (_, row, _) = lookup_role(&app, &shell, &viewer, &owner, &name, Access::Write).await?;
1232 
    let p = pdb::get(&app.db, row.id, number)
1233 
        .await
1234 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1235 
        .filter(|p| p.is_open())
1236 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1237 
    let on = f.on == "1";
1238 
    crate::autoland::set(&app, &row, &p, &me.account, on).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1239 
    let note = if on { "It will land when its checks pass." } else { "It will not land by itself." };
1240 
    Ok(back(&owner, &name, number, "conversation", Some(note.into()), None))
1241 
}
1242
1243 
/// Why a proposal did not land.
1244 
pub enum Landing {
1245 
    NotFound,
1246 
    Refused(String),
1247 
}
1248
1249 
/// Land proposal `number` as `me` (hub spec §8.4), who has write access:
1250 
/// refused while it is not open or has blockers. Moves the target bookmark
1251 
/// (attested by the hub key on `me`'s behalf when they delegated to it),
1252 
/// then records, announces and audits the landing, saying how it was done
1253 
/// (`via`: `web`, or `api (token NAME)`). `as_hub` signs with the hub's own
1254 
/// key rather than `me`'s delegation (Diffusion's auto-land).
1255 
/// `over_checks`, a reason, lands over required checks that have not
1256 
/// passed (#261): the caller has checked `me` maintains the repository;
1257 
/// every other blocker still holds. Returns the new state.
1258 
#[allow(clippy::too_many_arguments)]
1259 
pub async fn land_as(
1260 
    app: &Shared,
1261 
    repo: &RepoName,
1262 
    row: &db::repos::RepoRow,
1263 
    me: &accounts::Account,
1264 
    number: i64,
1265 
    via: &str,
1266 
    as_hub: bool,
1267 
    over_checks: Option<&str>,
1268 
) -> Result<String, Landing> {
1269 
    let (owner, name) = (row.owner.clone(), row.name.clone());
1270 
    let refused = |e: String| Landing::Refused(e);
1271 
    let p = pdb::get(&app.db, row.id, number).await.map_err(|e| refused(e.to_string()))?.ok_or(Landing::NotFound)?;
1272 
    let loaded = load(app, repo, p.clone()).await.map_err(|e| refused(e.to_string()))?;
1273 
    let v = verdict(app, &loaded, row.id).await.map_err(|e| refused(e.to_string()))?;
1274 
    if !p.is_open() {
1275 
        return Err(refused(format!("Cannot land: the proposal is {}", p.state)));
1276 
    }
1277 
    let reason = over_checks.map(str::trim);
1278 
    if reason == Some("") {
1279 
        return Err(refused("Landing over checks needs a reason: say why it can't wait for them".into()));
1280 
    }
1281 
    let blocking: Vec<&String> = v.blockers.iter().filter(|b| !(reason.is_some() && v.checks_blocker.as_ref() == Some(*b))).collect();
1282 
    if !blocking.is_empty() {
1283 
        let list: Vec<&str> = blocking.iter().map(|b| b.as_str()).collect();
1284 
        return Err(refused(format!("Cannot land: {}", list.join("; "))));
1285 
    }
1286 
    // Only when the checks were in the way does the landing say so.
1287 
    let over = reason.filter(|_| v.checks_blocker.is_some());
1288 
    let via_owned = match over {
1289 
        Some(r) => format!("{via}, over checks: {r}"),
1290 
        None => via.to_string(),
1291 
    };
1292 
    let via = via_owned.as_str();
1293 
    let target = p.target.clone();
1294 
    let heads = loaded.heads.clone();
1295 
    // With a delegation the landing is attested by the hub key on the
1296 
    // user's behalf, which a policy accepts when it lets the user update
1297 
    // the target (spec §14.5); without one, only a policy-free repository
1298 
    // can be landed here.
1299 
    let signer = if as_hub { super::edit::hub_signer(app) } else { super::edit::signer_for(app, me.id).await };
1300 
    let result = match signer {
1301 
        Ok(signer) => crate::repos::edits::move_bookmark(&app.repos, repo, target.clone(), heads.clone(), signer).await.map(|_| pl::state_ref(&heads).to_hex()),
1302 
        Err(why) => {
1303 
            app.repos
1304 
                .write(repo, move |r, _| {
1305 
                    if r.current_policy()?.is_some() {
1306 
                        return Err(crate::repos::RepoError::Oxy(oxy_core::repo::RepoError::Msg(format!(
1307 
                            "this repository has a trust policy, so the landing must be signed by a key it authorises. Land from a client with oxy proposal land, or delegate to the hub. {why}"
1308 
                        ))));
1309 
                    }
1310 
                    r.bookmark_set(&target, &heads)?;
1311 
                    Ok(pl::state_ref(&heads).to_hex())
1312 
                })
1313 
                .await
1314 
        }
1315 
    };
1316 
    let state = result.map_err(|e| refused(e.to_string()))?;
1317 
    pdb::set_landed(&app.db, p.id, &state, &me.username, via).await.map_err(|e| refused(e.to_string()))?;
1318 
    let how = if v.approvals.is_empty() { format!("{via}, with no approval") } else { via.to_string() };
1319 
    pdb::add_event(&app.db, p.id, &me.username, "landed", &how).await.ok();
1320 
    crate::hooks::emit(
1321 
        app,
1322 
        row,
1323 
        "proposal.landed",
1324 
        &me.username,
1325 
        serde_json::json!({ "number": number, "target": p.target, "state": state }),
1326 
    )
1327 
    .await;
1328 
    crate::notify::deliver(
1329 
        app,
1330 
        crate::notify::Event {
1331 
            kind: "proposal.landed",
1332 
            title: format!("{owner}/{name}#{number}: {} landed", p.title),
1333 
            url: format!("/{owner}/{name}/proposal/{number}"),
1334 
            actor: me,
1335 
            repo_id: row.id,
1336 
            thread: Some(("proposal", p.id)),
1337 
            mention_text: "",
1338 
            direct: p.author_id.into_iter().collect(),
1339 
        },
1340 
    )
1341 
    .await;
1342 
    if p.target == row.default_bookmark {
1343 
        let messages: Vec<(String, String)> = loaded.changes.iter().map(|c| (c.hash.clone(), format!("{}\n{}", c.title, c.body))).collect();
1344 
        super::issues::close_from_messages(app, row, &messages).await;
1345 
    }
1346 
    accounts::audit(&app.db, Some(me), "proposal.landed", &format!("{owner}/{name}#{number}"), &how).await.ok();
1347 
    if let (Some(r), Some(checks)) = (over, &v.checks_blocker) {
1348 
        accounts::audit(&app.db, Some(me), "proposal.land_over_checks", &format!("{owner}/{name}#{number}"), &format!("{r} ({checks})"))
1349 
            .await
1350 
            .ok();
1351 
    }
1352 
    db::repos::record_push(
1353 
        &app.db,
1354 
        row.id,
1355 
        Some((me.id, me.username.as_str())),
1356 
        &[db::repos::PushOutcome {
1357 
            reference: p.target.clone(),
1358 
            ok: true,
1359 
            reason: format!("landed #{number} ({how})"),
1360 
            old_state: loaded.target_state.clone(),
1361 
            new_state: state.clone(),
1362 
            heads: loaded.heads.len() as i64,
1363 
            changes: loaded.hashes.len() as i64,
1364 
        }],
1365 
    )
1366 
    .await
1367 
    .ok();
1368 
    // The target moved: its other open proposals are checked again (#134).
1369 
    settle_after_push(app, row, &p.target, &me.username).await;
1370 
    // ...and its pipeline runs, as a push of the same heads would start it
1371 
    // (#197): without the run a consumer following it when green would wait
1372 
    // for a state that never runs.
1373 
    crate::flow::on_push(app, row, &p.target, &state, &loaded.heads, &me.username).await;
1374 
    // A landing on the default bookmark closes the issues its changes (and
1375 
    // its description) say they close, as a push there would.
1376 
    if p.target == row.default_bookmark {
1377 
        let body = (format!("proposal #{number}"), p.body.clone());
1378 
        crate::web::issues::close_from_arrived(app, row, loaded.target_heads.clone(), loaded.heads.clone(), Some(body)).await;
1379 
    }
1380 
    // Diffusion (#150): a landing moves the target as a push would, so the
1381 
    // pin index follows it, and the consumers of a moved default bookmark
1382 
    // are bumped.
1383 
    let heads = loaded.heads.clone();
1384 
    let moved = vec![(p.target.clone(), state.clone(), heads.clone())];
1385 
    crate::diffusion::after_push(app, row, &moved).await;
1386 
    if p.target == row.default_bookmark {
1387 
        let (app, row) = (app.clone(), row.clone());
1388 
        tokio::spawn(async move { crate::diffusion::propagate(&app, &row, heads, false).await });
1389 
    }
1390 
    Ok(state)
1391 
}
1392
1393 
#[derive(Deserialize)]
1394 
pub struct LabelsForm {
1395 
    #[serde(rename = "_csrf")]
1396 
    csrf_token: String,
1397 
    #[serde(default)]
1398 
    label: Vec<i64>,
1399 
}
1400
1401 
pub async fn set_labels(
1402 
    State(app): State<Shared>,
1403 
    viewer: Viewer,
1404 
    Path((owner, name, number)): Path<(String, String, i64)>,
1405 
    axum_extra::extract::Form(f): axum_extra::extract::Form<LabelsForm>,
1406 
) -> Result<Response, Error> {
1407 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1408 
    require(&viewer, &shell)?;
1409 
    csrf(&viewer, &f.csrf_token, &shell)?;
1410 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1411 
    if role < Role::Triage {
1412 
        return Err(Error::not_found(shell));
1413 
    }
1414 
    let p = pdb::get(&app.db, row.id, number)
1415 
        .await
1416 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1417 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1418 
    for l in db::issues::labels(&app.db, row.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {
1419 
        db::issues::set_proposal_label(&app.db, p.id, l.id, f.label.contains(&l.id)).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1420 
    }
1421 
    Ok(back(&owner, &name, number, "conversation", None, None))
1422 
}
1423
1424 
/// `GET /{owner}/{name}/proposal/{number}/events`: server-sent events for
1425 
/// checks on the projected state (hub spec §13.1).
1426 
pub async fn events(
1427 
    State(app): State<Shared>,
1428 
    viewer: Viewer,
1429 
    Path((owner, name, number)): Path<(String, String, i64)>,
1430 
) -> Result<axum::response::Sse<impl futures::Stream<Item = Result<axum::response::sse::Event, std::convert::Infallible>>>, Error> {
1431 
    use futures::StreamExt;
1432 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1433 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1434 
    let rx = app.bus.subscribe(crate::bus::Topic::Proposals);
1435 
    let repo_id = row.id;
1436 
    let stream = tokio_stream::wrappers::BroadcastStream::new(rx).filter_map(move |item| async move {
1437 
        match item {
1438 
            Ok(crate::bus::Event::Proposal { repo, event: ev }) if repo == repo_id => {
1439 
                Some(Ok(axum::response::sse::Event::default().event(ev.kind.clone()).data(serde_json::to_string(&ev).unwrap_or_default())))
1440 
            }
1441 
            _ => None,
1442 
        }
1443 
    });
1444 
    Ok(axum::response::Sse::new(futures::StreamExt::take_until(stream, crate::shutdown::stopping()))
1445 
        .keep_alive(axum::response::sse::KeepAlive::default()))
1446 
}
1447
1448 
// -------------------------------------------------------------------- API
1449
1450 
pub async fn to_api(app: &Shared, owner: &str, name: &str, loaded: &Loaded, v: &Verdict, source_url: Option<String>) -> hub_api::Proposal {
1451 
    let p = &loaded.row;
1452 
    hub_api::Proposal {
1453 
        number: p.number,
1454 
        title: p.title.clone(),
1455 
        body: p.body.clone(),
1456 
        author: p.author.clone(),
1457 
        state: ProposalState::parse(&p.state).unwrap_or(ProposalState::Open),
1458 
        target: p.target.clone(),
1459 
        source: match p.source_kind.as_str() {
1460 
            "fork" => {
1461 
                let (o, n) = source_url
1462 
                    .as_deref()
1463 
                    .and_then(|u| u.rsplit_once('/'))
1464 
                    .and_then(|(b, n)| b.rsplit_once('/').map(|(_, o)| (o.to_string(), n.to_string())))
1465 
                    .unwrap_or_default();
1466 
                ProposalSource::Fork { owner: o, name: n, bookmark: p.source_bookmark.clone() }
1467 
            }
1468 
            "changes" => ProposalSource::Changes { hashes: p.source_changes() },
1469 
            _ => ProposalSource::Bookmark { bookmark: p.source_bookmark.clone() },
1470 
        },
1471 
        changes: loaded
1472 
            .changes
1473 
            .iter()
1474 
            .map(|c| hub_api::ChangeSummary {
1475 
                hash: c.hash.clone(),
1476 
                message: if c.body.is_empty() { c.title.clone() } else { format!("{}\n\n{}", c.title, c.body) },
1477 
                author: hub_api::Author {
1478 
                    name: c.author.name.clone(),
1479 
                    email: c.author.email.clone(),
1480 
                    key: c.author.key.clone(),
1481 
                    account: c.author.account.clone(),
1482 
                    note: hub_api::Author::note_for(&c.author.key, &c.author.account),
1483 
                },
1484 
                when_ms: c.when_ms,
1485 
                deps: c.deps.clone(),
1486 
                head: c.head,
1487 
                via: c.via.as_ref().map(|v| hub_api::Via {
1488 
                    name: v.name.clone(),
1489 
                    key: v.key.clone(),
1490 
                    scope: v.scope.clone(),
1491 
                    expires_ms: v.expires_ms,
1492 
                    revoked: v.revoked,
1493 
                }),
1494 
                signature: match &c.signature {
1495 
                    view::SigView::Unsigned => hub_api::Signature::Unsigned,
1496 
                    view::SigView::Valid { key, sealed, revoked, .. } => {
1497 
                        hub_api::Signature::Valid { key: key.clone(), sealed: *sealed, revoked: *revoked }
1498 
                    }
1499 
                    view::SigView::Invalid(why) => hub_api::Signature::Invalid { reason: why.clone() },
1500 
                },
1501 
            })
1502 
            .collect(),
1503 
        projected_heads: loaded.heads.iter().map(|h| h.to_hex()).collect(),
1504 
        projected_state: Some(loaded.state.clone()),
1505 
        conflicted: loaded.conflicted,
1506 
        approvals: v.approvals.clone(),
1507 
        landable: p.is_open() && v.blockers.is_empty(),
1508 
        blockers: v.blockers.clone(),
1509 
        created_ms: p.created_ms,
1510 
        updated_ms: p.updated_ms,
1511 
        url: format!("{}/{owner}/{name}/proposal/{}", app.config.base_url(), p.number),
1512 
        repository_url: format!("{}/{owner}/{name}", app.config.base_url()),
1513 
        source_url,
1514 
        landed: (p.state == "landed" && p.landed_ms > 0).then(|| hub_api::Landed {
1515 
            by: p.landed_by.clone(),
1516 
            via: p.landed_via.clone(),
1517 
            when_ms: p.landed_ms,
1518 
        }),
1519 
        auto_land: (p.is_open() && !p.auto_land_by.is_empty()).then(|| p.auto_land_by.clone()),
1520 
        requested_reviewers: pdb::review_requests(&app.db, p.id).await.unwrap_or_default(),
1521 
        labels: db::issues::proposal_labels(&app.db, p.id)
1522 
            .await
1523 
            .unwrap_or_default()
1524 
            .into_iter()
1525 
            .map(|l| hub_api::Label { name: l.name, colour: l.colour, description: l.description })
1526 
            .collect(),
1527 
    }
1528 
}
1529
1530 
/// The line comment form's placement key, for templates.
1531 
pub fn key(path: &str, line: impl filters::Num) -> (String, usize) {
1532 
    (path.to_string(), line.as_u64() as usize)
1533 
}
1534
1535 
#[allow(dead_code)]
1536 
fn _unused(_: &diff::Line, _: &ConflictView, _: &Role) {}
1537
1538 
// ------------------------------------------------------- review requests
1539
1540 
/// Ask accounts to review a proposal (hub plan 0.4): each must exist, be
1541 
/// someone other than the author, and be able to read the repository. Each
1542 
/// newly asked is told, and the proposal records it. The usernames newly
1543 
/// asked, or why none could be.
1544 
pub async fn request_reviewers(
1545 
    app: &Shared,
1546 
    row: &db::repos::RepoRow,
1547 
    p: &pdb::ProposalRow,
1548 
    by: &accounts::Account,
1549 
    names: &[String],
1550 
) -> Result<Vec<String>, String> {
1551 
    let mut found = Vec::new();
1552 
    for name in names.iter().map(|n| n.trim().trim_start_matches('@')).filter(|n| !n.is_empty()) {
1553 
        let Some(a) = accounts::account_by_name(&app.db, name).await.ok().flatten() else {
1554 
            return Err(format!("There is no account {name}."));
1555 
        };
1556 
        if Some(a.id) == p.author_id {
1557 
            return Err(format!("{name} wrote this proposal, and cannot review it."));
1558 
        }
1559 
        let role = crate::auth::roles::role_for(&app.db, Some(&a), row).await.ok().flatten();
1560 
        if !crate::auth::roles::allows(role, crate::auth::Access::Read) {
1561 
            return Err(format!("{name} cannot read this repository."));
1562 
        }
1563 
        found.push(a);
1564 
    }
1565 
    let mut asked = Vec::new();
1566 
    for a in found {
1567 
        if !pdb::request_review(&app.db, p.id, a.id, &by.username).await.map_err(|e| e.to_string())? {
1568 
            continue;
1569 
        }
1570 
        pdb::add_event(&app.db, p.id, &by.username, "review requested", &a.username).await.ok();
1571 
        crate::notify::deliver(
1572 
            app,
1573 
            crate::notify::Event {
1574 
                kind: "proposal.review_requested",
1575 
                title: format!("{}/{}#{}: {} (review requested from {})", row.owner, row.name, p.number, p.title, a.username),
1576 
                url: format!("/{}/{}/proposal/{}", row.owner, row.name, p.number),
1577 
                actor: by,
1578 
                repo_id: row.id,
1579 
                thread: None,
1580 
                mention_text: "",
1581 
                direct: vec![a.id],
1582 
            },
1583 
        )
1584 
        .await;
1585 
        asked.push(a.username);
1586 
    }
1587 
    Ok(asked)
1588 
}
1589
1590 
/// After a review: it answers the reviewer's request, if there was one, and
1591 
/// the proposal's author is told.
1592 
pub async fn reviewed(app: &Shared, row: &db::repos::RepoRow, p: &pdb::ProposalRow, by: &accounts::Account, verdict: &str) {
1593 
    pdb::unrequest_review(&app.db, p.id, by.id).await.ok();
1594 
    let what = match verdict {
1595 
        "approve" => "approved",
1596 
        "changes" => "changes requested",
1597 
        _ => "reviewed",
1598 
    };
1599 
    crate::notify::deliver(
1600 
        app,
1601 
        crate::notify::Event {
1602 
            kind: "proposal.review",
1603 
            title: format!("{}/{}#{}: {} ({what} by {})", row.owner, row.name, p.number, p.title, by.username),
1604 
            url: format!("/{}/{}/proposal/{}", row.owner, row.name, p.number),
1605 
            actor: by,
1606 
            repo_id: row.id,
1607 
            thread: Some(("proposal", p.id)),
1608 
            mention_text: "",
1609 
            direct: p.author_id.into_iter().collect(),
1610 
        },
1611 
    )
1612 
    .await;
1613 
}
1614
1615 
#[derive(Deserialize)]
1616 
pub struct ReviewersForm {
1617 
    #[serde(rename = "_csrf")]
1618 
    csrf_token: String,
1619 
    /// `add`, `remove`, or `set` (the menu: exactly these are asked).
1620 
    action: String,
1621 
    #[serde(default)]
1622 
    username: Vec<String>,
1623 
}
1624
1625 
/// `POST /{owner}/{name}/proposal/{number}/reviewers`: the author or a
1626 
/// writer asks someone to review, or withdraws the request.
1627 
pub async fn reviewers(
1628 
    State(app): State<Shared>,
1629 
    viewer: Viewer,
1630 
    Path((owner, name, number)): Path<(String, String, i64)>,
1631 
    axum_extra::extract::Form(f): axum_extra::extract::Form<ReviewersForm>,
1632 
) -> Result<Response, Error> {
1633 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1634 
    let me = require(&viewer, &shell)?;
1635 
    csrf(&viewer, &f.csrf_token, &shell)?;
1636 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1637 
    let p = pdb::get(&app.db, row.id, number)
1638 
        .await
1639 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1640 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1641 
    if Some(me.account.id) != p.author_id && role < Role::Write {
1642 
        return Err(Error::not_found(shell));
1643 
    }
1644 
    let names: Vec<String> = f.username.iter().map(|n| n.trim().trim_start_matches('@').to_string()).filter(|n| !n.is_empty()).collect();
1645 
    let current = pdb::review_requests(&app.db, p.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1646 
    // Withdrawn: those named (remove), or those the menu left out (set).
1647 
    let withdraw: Vec<String> = match f.action.as_str() {
1648 
        "remove" => names.clone(),
1649 
        "set" => current.iter().filter(|c| !names.iter().any(|n| n.eq_ignore_ascii_case(c))).cloned().collect(),
1650 
        _ => Vec::new(),
1651 
    };
1652 
    for who in &withdraw {
1653 
        if let Some(a) = accounts::account_by_name(&app.db, who).await.ok().flatten() {
1654 
            if pdb::unrequest_review(&app.db, p.id, a.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {
1655 
                pdb::add_event(&app.db, p.id, &me.account.username, "review request withdrawn", &a.username).await.ok();
1656 
            }
1657 
        }
1658 
    }
1659 
    let ask: Vec<String> = match f.action.as_str() {
1660 
        "add" => names,
1661 
        "set" => names.into_iter().filter(|n| !current.iter().any(|c| c.eq_ignore_ascii_case(n))).collect(),
1662 
        _ => return Ok(back(&owner, &name, number, "conversation", None, None)),
1663 
    };
1664 
    if ask.is_empty() {
1665 
        return Ok(back(&owner, &name, number, "conversation", None, None));
1666 
    }
1667 
    match request_reviewers(&app, &row, &p, &me.account, &ask).await {
1668 
        Ok(asked) if asked.is_empty() => Ok(back(&owner, &name, number, "conversation", Some("Already asked.".into()), None)),
1669 
        Ok(asked) => Ok(back(&owner, &name, number, "conversation", Some(format!("Asked {} to review.", asked.join(", "))), None)),
1670 
        Err(e) => Ok(back(&owner, &name, number, "conversation", None, Some(e))),
1671 
    }
1672 
}
1673
1674 
#[derive(Deserialize)]
1675 
pub struct AssistantForm {
1676 
    #[serde(rename = "_csrf")]
1677 
    csrf_token: String,
1678 
    assistant: String,
1679 
    /// `summary` asks for a summary comment (oxygenhub#190); otherwise a review.
1680 
    #[serde(default)]
1681 
    task: String,
1682 
}
1683
1684 
/// `POST /{owner}/{name}/proposal/{number}/assistant`: the author or a
1685 
/// writer asks an AI assistant to review (hub spec §13.4). The answer
1686 
/// comes later as a review via the assistant.
1687 
pub async fn assistant(
1688 
    State(app): State<Shared>,
1689 
    viewer: Viewer,
1690 
    Path((owner, name, number)): Path<(String, String, i64)>,
1691 
    Form(f): Form<AssistantForm>,
1692 
) -> Result<Response, Error> {
1693 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1694 
    let me = require(&viewer, &shell)?;
1695 
    csrf(&viewer, &f.csrf_token, &shell)?;
1696 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1697 
    super::writable(&row, &shell)?;
1698 
    let p = pdb::get(&app.db, row.id, number)
1699 
        .await
1700 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1701 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1702 
    if Some(me.account.id) != p.author_id && role < Role::Write {
1703 
        return Err(Error::not_found(shell));
1704 
    }
1705 
    if !p.is_open() {
1706 
        return Ok(back(&owner, &name, number, "conversation", None, Some("The proposal is not open.".into())));
1707 
    }
1708 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
1709 
        .await
1710 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1711 
        .into_iter()
1712 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
1713 
    else {
1714 
        return Ok(back(&owner, &name, number, "conversation", None, Some(format!("No assistant called {} here.", f.assistant.trim()))));
1715 
    };
1716 
    let who = a.name.clone();
1717 
    let summary = f.task == "summary";
1718 
    let asked = if summary {
1719 
        crate::assistants::request_summary(&app, &row, &p, &me.account, a).await
1720 
    } else {
1721 
        crate::assistants::request_review(&app, &row, &p, &me.account, a).await
1722 
    };
1723 
    match asked {
1724 
        Ok(()) => Ok(back(
1725 
            &owner,
1726 
            &name,
1727 
            number,
1728 
            "conversation",
1729 
            Some(if summary {
1730 
                format!("Asked {who} for a summary; its comment appears here when it comes.")
1731 
            } else {
1732 
                format!("Asked {who} to review; its answer appears here when it comes.")
1733 
            }),
1734 
            None,
1735 
        )),
1736 
        Err(e) => Ok(back(&owner, &name, number, "conversation", None, Some(format!("Not asked: {e}.")))),
1737 
    }
1738 
}
1739
1740 
/// The assistants a repository may use, by name.
1741 
async fn assistant_names(app: &Shared, row: &db::repos::RepoRow) -> Vec<String> {
1742 
    crate::assistants::enabled_for_repo(&app.db, row).await.unwrap_or_default().into_iter().map(|a| a.name).collect()
1743 
}
1744
1745 
/// The changes and the file diffs a proposal from `source` into `target`
1746 
/// would carry.
1747 
async fn preview_diff(
1748 
    app: &Shared,
1749 
    repo: &RepoName,
1750 
    target: &str,
1751 
    source: &str,
1752 
) -> Result<(Vec<ChangeView>, Vec<oxy_core::repo::FileDiff>), crate::repos::RepoError> {
1753 
    let Some((fork, bookmark)) = parse_source(app, repo, source) else { return Ok((vec![], vec![])) };
1754 
    let target = target.to_string();
1755 
    let fork_dir = fork.as_ref().map(|f| app.repos.dir(f));
1756 
    app.repos
1757 
        .read(repo, move |r, cache| {
1758 
            let projection = match &fork_dir {
1759 
                Some(dir) => {
1760 
                    let fork_repo = oxy_core::repo::Repo::open(dir)?;
1761 
                    let heads = fork_repo.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
1762 
                    pl::project(r, cache, &target, Source::Fork { fork: &fork_repo, heads })?
1763 
                }
1764 
                None => {
1765 
                    let heads = r.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
1766 
                    pl::project(r, cache, &target, Source::Bookmark(heads))?
1767 
                }
1768 
            };
1769 
            Ok((projection.changes, projection.files))
1770 
        })
1771 
        .await
1772 
}
1773
1774 
/// `POST /{owner}/{name}/proposals/new/draft`: an assistant drafts the
1775 
/// description from the changes the proposal would add; the form comes
1776 
/// back with the draft to edit (hub spec §13.4).
1777 
pub async fn new_draft(
1778 
    State(app): State<Shared>,
1779 
    viewer: Viewer,
1780 
    Path((owner, name)): Path<(String, String)>,
1781 
    Form(f): Form<NewForm>,
1782 
) -> Result<Page<NewProposalPage>, Error> {
1783 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposals/new"), &viewer);
1784 
    let me = require(&viewer, &shell)?;
1785 
    csrf(&viewer, &f.csrf_token, &shell)?;
1786 
    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1787 
    super::writable(&row, &shell)?;
1788 
    let bookmarks =
1789 
        app.repos.read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>())).await.unwrap_or_default();
1790 
    let (preview, conflicted) = preview_for(&app, &repo, &f.target, &f.source).await.unwrap_or((vec![], false));
1791 
    let assistants = if preview.is_empty() { vec![] } else { assistant_names(&app, &row).await };
1792 
    let mut page = NewProposalPage {
1793 
        shell,
1794 
        repo: RepoShell::new(&app, &row, "proposals").with_role(role),
1795 
        bookmarks,
1796 
        source: f.source.clone(),
1797 
        target: f.target.clone(),
1798 
        error: None,
1799 
        preview,
1800 
        conflicted,
1801 
        title: f.title.clone(),
1802 
        body: f.body.clone(),
1803 
        assistants,
1804 
    };
1805 
    let assistant = crate::assistants::enabled_for_repo(&app.db, &row)
1806 
        .await
1807 
        .unwrap_or_default()
1808 
        .into_iter()
1809 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()));
1810 
    let Some(a) = assistant else {
1811 
        page.error = Some(format!("No assistant called {} here.", f.assistant.trim()));
1812 
        return Ok(Page(page));
1813 
    };
1814 
    if page.preview.is_empty() {
1815 
        page.error = Some("Nothing to describe: the source adds nothing to the target.".into());
1816 
        return Ok(Page(page));
1817 
    }
1818 
    let (changes, diffs) = match preview_diff(&app, &repo, &f.target, &f.source).await {
1819 
        Ok(x) => x,
1820 
        Err(e) => {
1821 
            page.error = Some(e.to_string());
1822 
            return Ok(Page(page));
1823 
        }
1824 
    };
1825 
    let d = crate::assistants::Draft { slot: -row.id, title: &f.title, target: &f.target, changes: &changes, diffs: &diffs };
1826 
    match crate::assistants::draft_description(&app, &row, &me.account, &a, d).await {
1827 
        Ok(text) => page.body = text,
1828 
        Err(why) => page.error = Some(format!("{} did not answer: {why}.", a.name)),
1829 
    }
1830 
    Ok(Page(page))
1831 
}
1832
1833 
#[derive(Deserialize)]
1834 
pub struct DraftForm {
1835 
    #[serde(rename = "_csrf")]
1836 
    csrf_token: String,
1837 
    assistant: String,
1838 
    #[serde(default)]
1839 
    title: String,
1840 
}
1841
1842 
/// `POST /{owner}/{name}/proposal/{number}/draft`: an assistant drafts the
1843 
/// description of an open proposal from its changes; the editor opens
1844 
/// with the draft, nothing is saved (hub spec §13.4).
1845 
pub async fn draft(
1846 
    State(app): State<Shared>,
1847 
    viewer: Viewer,
1848 
    Path((owner, name, number)): Path<(String, String, i64)>,
1849 
    Form(f): Form<DraftForm>,
1850 
) -> Result<Response, Error> {
1851 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1852 
    let me = require(&viewer, &shell)?;
1853 
    csrf(&viewer, &f.csrf_token, &shell)?;
1854 
    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1855 
    super::writable(&row, &shell)?;
1856 
    let p = pdb::get(&app.db, row.id, number)
1857 
        .await
1858 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1859 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1860 
    if Some(me.account.id) != p.author_id && role < Role::Maintain {
1861 
        return Err(Error::not_found(shell));
1862 
    }
1863 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
1864 
        .await
1865 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1866 
        .into_iter()
1867 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
1868 
    else {
1869 
        return Ok(back(&owner, &name, number, "conversation", None, Some(format!("No assistant called {} here.", f.assistant.trim()))));
1870 
    };
1871 
    let loaded = crate::web::proposals::load(&app, &repo, p.clone()).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
1872 
    let title = if f.title.trim().is_empty() { p.title.clone() } else { f.title.clone() };
1873 
    let d = crate::assistants::Draft { slot: p.id, title: &title, target: &p.target, changes: &loaded.changes, diffs: &loaded.diffs };
1874 
    let draft = crate::assistants::draft_description(&app, &row, &me.account, &a, d).await;
1875 
    match draft {
1876 
        Ok(text) => {
1877 
            let mut page = detail(&app, shell, &viewer, &owner, &name, number, "conversation".into(), None, None).await?;
1878 
            page.0.draft = Some(text);
1879 
            Ok(page.into_response())
1880 
        }
1881 
        Err(why) => Ok(back(&owner, &name, number, "conversation", None, Some(format!("{} did not answer: {why}.", a.name)))),
1882 
    }
1883 
}
1884
1885 
/// A draft being written, as server-sent events for the page: `part` with
1886 
/// each piece of text, then `done` with the whole draft or `error` with
1887 
/// why there is none (each a JSON string). The response starts at once, so
1888 
/// a draft that takes minutes is not cut off by a proxy waiting for it
1889 
/// (oxygenhub#248).
1890 
type DraftEvents = axum::response::Sse<
1891 
    axum::response::sse::KeepAliveStream<
1892 
        tokio_stream::wrappers::ReceiverStream<Result<axum::response::sse::Event, std::convert::Infallible>>,
1893 
    >,
1894 
>;
1895
1896 
fn draft_events(rx: tokio::sync::mpsc::Receiver<Result<axum::response::sse::Event, std::convert::Infallible>>) -> DraftEvents {
1897 
    axum::response::Sse::new(tokio_stream::wrappers::ReceiverStream::new(rx))
1898 
        .keep_alive(axum::response::sse::KeepAlive::new().interval(std::time::Duration::from_secs(15)))
1899 
}
1900
1901 
fn draft_event(kind: &str, text: &str) -> Result<axum::response::sse::Event, std::convert::Infallible> {
1902 
    Ok(axum::response::sse::Event::default().event(kind).data(serde_json::to_string(text).unwrap_or_default()))
1903 
}
1904
1905 
/// Only an error, for a draft that cannot start.
1906 
fn draft_refused(why: String) -> DraftEvents {
1907 
    let (tx, rx) = tokio::sync::mpsc::channel(1);
1908 
    let _ = tx.try_send(draft_event("error", &why));
1909 
    draft_events(rx)
1910 
}
1911
1912 
/// What a draft is written from, owned so a task of its own can have it.
1913 
struct DraftJob {
1914 
    row: db::repos::RepoRow,
1915 
    by: accounts::Account,
1916 
    a: crate::assistants::Assistant,
1917 
    slot: i64,
1918 
    title: String,
1919 
    target: String,
1920 
    changes: Vec<ChangeView>,
1921 
    diffs: Vec<oxy_core::repo::FileDiff>,
1922 
}
1923
1924 
/// Write the draft in a task of its own, its parts to the page.
1925 
fn draft_in_background(app: Shared, job: DraftJob) -> DraftEvents {
1926 
    let (tx, rx) = tokio::sync::mpsc::channel(64);
1927 
    tokio::spawn(async move {
1928 
        let DraftJob { row, by, a, slot, title, target, changes, diffs } = job;
1929 
        let d = crate::assistants::Draft { slot, title: &title, target: &target, changes: &changes, diffs: &diffs };
1930 
        let parts = tx.clone();
1931 
        let result = crate::assistants::draft_description_streaming(&app, &row, &by, &a, d, move |p: &str| {
1932 
            // A page that went away stops nothing: the draft finishes.
1933 
            let _ = parts.try_send(draft_event("part", p));
1934 
        })
1935 
        .await;
1936 
        let last = match result {
1937 
            Ok(text) => draft_event("done", text.trim()),
1938 
            Err(why) => draft_event("error", &format!("{} did not answer: {why}.", a.name)),
1939 
        };
1940 
        let _ = tx.send(last).await;
1941 
    });
1942 
    draft_events(rx)
1943 
}
1944
1945 
/// `POST /{owner}/{name}/proposal/{number}/draft/stream`: [`draft`], with
1946 
/// the draft streamed to the page as it is written.
1947 
pub async fn draft_stream(
1948 
    State(app): State<Shared>,
1949 
    viewer: Viewer,
1950 
    Path((owner, name, number)): Path<(String, String, i64)>,
1951 
    Form(f): Form<DraftForm>,
1952 
) -> Result<DraftEvents, Error> {
1953 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1954 
    let me = require(&viewer, &shell)?;
1955 
    csrf(&viewer, &f.csrf_token, &shell)?;
1956 
    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1957 
    super::writable(&row, &shell)?;
1958 
    let p = pdb::get(&app.db, row.id, number)
1959 
        .await
1960 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1961 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1962 
    if Some(me.account.id) != p.author_id && role < Role::Maintain {
1963 
        return Err(Error::not_found(shell));
1964 
    }
1965 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
1966 
        .await
1967 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1968 
        .into_iter()
1969 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
1970 
    else {
1971 
        return Ok(draft_refused(format!("No assistant called {} here.", f.assistant.trim())));
1972 
    };
1973 
    let loaded = load(&app, &repo, p.clone()).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
1974 
    let title = if f.title.trim().is_empty() { p.title.clone() } else { f.title.clone() };
1975 
    let job = DraftJob {
1976 
        row,
1977 
        by: me.account.clone(),
1978 
        a,
1979 
        slot: p.id,
1980 
        title,
1981 
        target: p.target.clone(),
1982 
        changes: loaded.changes,
1983 
        diffs: loaded.diffs,
1984 
    };
1985 
    Ok(draft_in_background(app.clone(), job))
1986 
}
1987
1988 
/// `POST /{owner}/{name}/proposals/new/draft/stream`: [`new_draft`], with
1989 
/// the draft streamed to the page as it is written.
1990 
pub async fn new_draft_stream(
1991 
    State(app): State<Shared>,
1992 
    viewer: Viewer,
1993 
    Path((owner, name)): Path<(String, String)>,
1994 
    Form(f): Form<NewForm>,
1995 
) -> Result<DraftEvents, Error> {
1996 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposals/new"), &viewer);
1997 
    let me = require(&viewer, &shell)?;
1998 
    csrf(&viewer, &f.csrf_token, &shell)?;
1999 
    let (repo, row, _role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
2000 
    super::writable(&row, &shell)?;
2001 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
2002 
        .await
2003 
        .unwrap_or_default()
2004 
        .into_iter()
2005 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
2006 
    else {
2007 
        return Ok(draft_refused(format!("No assistant called {} here.", f.assistant.trim())));
2008 
    };
2009 
    let (changes, diffs) = match preview_diff(&app, &repo, &f.target, &f.source).await {
2010 
        Ok(x) => x,
2011 
        Err(e) => return Ok(draft_refused(e.to_string())),
2012 
    };
2013 
    if changes.is_empty() {
2014 
        return Ok(draft_refused("Nothing to describe: the source adds nothing to the target.".into()));
2015 
    }
2016 
    let job = DraftJob { slot: -row.id, row, by: me.account.clone(), a, title: f.title.clone(), target: f.target.clone(), changes, diffs };
2017 
    Ok(draft_in_background(app.clone(), job))
2018 
}