OXYGENHUB
# d1727c573f30 oxygenhub / crates / hub / src / web / proposals.rs
68.2 KiB · Rust · last changed AI assistants review proposals and draft their descriptions 1 month 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());
267 
    }
268 
    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())?;
270 
    if !bookmarks.iter().any(|b| b == target) {
271 
        return Err("Pick a target bookmark of this repository.".into());
272 
    }
273 
    let Some((fork, bookmark)) = parse_source(app, repo, source.trim()) else {
274 
        return Err("The source is a bookmark of this repository, or owner/name:bookmark of a fork.".into());
275 
    };
276 
    if fork.is_none() && !bookmarks.contains(&bookmark) {
277 
        return Err(format!("There is no bookmark {bookmark} in this repository."));
278 
    }
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,
292 
        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,
298 
            draft,
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            target,
300 
            source_kind: if fork.is_some() { "fork" } else { "bookmark" },
301 
            source_repo_id,
302 
            source_bookmark: &bookmark,
303 
            source_changes: "",
304 
        },
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",
316 
            title: format!("{}#{}: {}", row.slug(), created.number, created.title),
317 
            url,
318 
            actor: me,
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            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,
331 
        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 
    match open_proposal(&app, &repo, &row, &me.account, &f.title, &f.body, &f.target, &f.source, f.draft.is_some()).await {
348 
        Ok(created) => Ok(Redirect::to(&format!("/{owner}/{name}/proposal/{}", created.number)).into_response()),
349 
        Err(msg) => {
350 
            let bookmarks =
351 
                app.repos.read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>())).await.unwrap_or_default();
352 
            Ok(Page(NewProposalPage {
353 
                shell,
354 
                repo: RepoShell::new(&app, &row, "proposals").with_role(role),
355 
                bookmarks,
356 
                source: f.source.clone(),
357 
                target: f.target.clone(),
358 
                error: Some(msg),
359 
                preview: vec![],
360 
                conflicted: false,
361 
                title: f.title.clone(),
362 
                body: f.body.clone(),
363 
                assistants: vec![],
364 
            })
365 
            .into_response())
366 
        }
367 
    }
368 
}
369
370 
// ---------------------------------------------------------------- detail
371
372 
/// A comment placed on a diff row, or general.
373 
pub struct CommentView {
374 
    pub row: pdb::CommentRow,
375 
    pub body_html: String,
376 
    pub line: Option<usize>,
377 
}
378
379 
/// One entry of a proposal's conversation, in time order: what kind it
380 
/// is and its index in `comments`, `reviews` or `events`.
381 
pub struct Entry {
382 
    pub kind: &'static str,
383 
    pub index: usize,
384 
}
385
386 
pub struct ReviewView {
387 
    pub row: pdb::ReviewRow,
388 
    pub body_html: String,
389 
    pub sealed: bool,
390 
}
391
392 
/// Everything the detail page and the API need, computed once under the lock.
393 
pub struct Loaded {
394 
    pub row: pdb::ProposalRow,
395 
    pub changes: Vec<ChangeView>,
396 
    pub hashes: Vec<ChangeHash>,
397 
    pub heads: Vec<ChangeHash>,
398 
    pub target_heads: Vec<ChangeHash>,
399 
    pub state: String,
400 
    pub target_state: String,
401 
    pub conflicted: bool,
402 
    pub conflicts: Vec<ConflictView>,
403 
    pub files: Vec<FileRows>,
404 
    /// The per-file hunks and bases behind `files`, to render again with other options.
405 
    pub diffs: Vec<oxy_core::repo::FileDiff>,
406 
    pub bases: std::collections::BTreeMap<String, Vec<u8>>,
407 
    /// Atom per (path, new line number) of the projected state.
408 
    pub atoms: HashMap<(String, usize), (String, u32)>,
409 
    pub sealing_keys: Vec<String>,
410 
    pub touched: Vec<String>,
411 
    pub owners: Vec<String>,
412 
    pub landed_already: bool,
413 
}
414
415 
/// Compute the projection and everything derived from it.
416 
pub async fn load(app: &Shared, repo: &RepoName, row: pdb::ProposalRow) -> Result<Loaded, crate::repos::RepoError> {
417 
    let fork_dir = match (row.source_kind.as_str(), row.source_repo_id) {
418 
        ("fork", Some(id)) => {
419 
            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))
420 
        }
421 
        _ => None,
422 
    };
423 
    let r2 = row.clone();
424 
    let loaded = app
425 
        .repos
426 
        .read(repo, move |r, cache| {
427 
            let source = match (r2.source_kind.as_str(), &fork_dir) {
428 
                ("changes", _) => Source::Changes(r2.source_changes().iter().filter_map(|h| ChangeHash::from_hex(h)).collect()),
429 
                ("fork", Some(dir)) => {
430 
                    let fork_repo = oxy_core::repo::Repo::open(dir)?;
431 
                    let heads =
432 
                        fork_repo.bookmarks()?.into_iter().find(|b| b.name == r2.source_bookmark).map(|b| b.heads).unwrap_or_default();
433 
                    // Bring the fork's changes over now, so the projection below can read them.
434 
                    let fork_state = fork_repo.load_state(&heads)?;
435 
                    let missing: Vec<ChangeHash> = fork_state.changes().map(|(h, _)| *h).filter(|h| !r.store().has(h)).collect();
436 
                    if !missing.is_empty() {
437 
                        r.import_bundle(&fork_repo.bundle_for(&missing)?, r.current_policy()?.is_some())?;
438 
                    }
439 
                    Source::Changes(heads)
440 
                }
441 
                _ => {
442 
                    let heads = r.bookmarks()?.into_iter().find(|b| b.name == r2.source_bookmark).map(|b| b.heads).unwrap_or_default();
443 
                    Source::Bookmark(heads)
444 
                }
445 
            };
446 
            let p: Projection = pl::project(r, cache, &r2.target, source)?;
447 
            let target_loaded = cache.load(r, &p.target_heads)?;
448 
            let files = render_files(&p.files, &p.bases);
449 
            let mut atoms = HashMap::new();
450 
            for f in &files {
451 
                for l in &f.lines {
452 
                    if let Some(n) = l.new_no {
453 
                        if let Some((h, i)) = pl::atom_at(&p.loaded, &f.path, n as usize) {
454 
                            atoms.insert((f.path.clone(), n as usize), (h.to_hex(), i));
455 
                        }
456 
                    }
457 
                }
458 
            }
459 
            let touched: Vec<String> = p.files.iter().map(|f| f.path.clone()).collect();
460 
            let owners = pl::owners_for(&target_loaded, &touched);
461 
            let sealing = pl::sealing_keys(r, &p.hashes)?.into_iter().map(|k| k.to_hex()).collect();
462 
            let landed_already = !p.hashes.is_empty() && p.hashes.iter().all(|h| target_loaded.state.contains(h));
463 
            // A landed proposal's changes are in its target now: it shows
464 
            // the ones it landed, as recorded when it landed.
465 
            let (changes, hashes) = if r2.state == "landed" && p.hashes.is_empty() {
466 
                let hashes: Vec<ChangeHash> = r2.projected_changes().iter().filter_map(|h| ChangeHash::from_hex(h)).collect();
467 
                let labels = HashMap::new();
468 
                let changes = hashes
469 
                    .iter()
470 
                    .filter_map(|h| Some(view::change_view_pub(r, h, &r.store().get_change_meta(h).ok()?, false, &labels)))
471 
                    .collect();
472 
                (changes, hashes)
473 
            } else {
474 
                (p.changes, p.hashes)
475 
            };
476 
            Ok(Loaded {
477 
                row: r2,
478 
                changes,
479 
                hashes,
480 
                heads: p.heads,
481 
                target_heads: p.target_heads.clone(),
482 
                state: p.state.to_hex(),
483 
                target_state: p.target_state.to_hex(),
484 
                conflicted: p.conflicted,
485 
                conflicts: p.conflicts,
486 
                files,
487 
                diffs: p.files.clone(),
488 
                bases: p.bases.clone(),
489 
                atoms,
490 
                sealing_keys: sealing,
491 
                touched,
492 
                owners,
493 
                landed_already,
494 
            })
495 
        })
496 
        .await?;
497 
    // Remember the projection for the list, the API and other proposals'
498 
    // stacking checks, while the proposal is open: a landed one keeps what
499 
    // it landed.
500 
    if !loaded.row.is_open() {
501 
        return Ok(loaded);
502 
    }
503 
    let heads_csv = loaded.heads.iter().map(|h| h.to_hex()).collect::<Vec<_>>().join(",");
504 
    let changes_csv = loaded.hashes.iter().map(|h| h.to_hex()).collect::<Vec<_>>().join(",");
505 
    pdb::set_projection(&app.db, loaded.row.id, &loaded.state, &heads_csv, &loaded.target_state, &changes_csv, loaded.conflicted)
506 
        .await
507 
        .ok();
508 
    Ok(loaded)
509 
}
510
511 
/// Reviews, approvals and blockers.
512 
pub struct Verdict {
513 
    pub reviews: Vec<ReviewView>,
514 
    pub approvals: Vec<Approval>,
515 
    pub blockers: Vec<String>,
516 
    pub depends_on: Vec<i64>,
517 
    pub requirements: pdb::Requirements,
518 
}
519
520 
pub async fn verdict(app: &Shared, loaded: &Loaded, repo_id: i64) -> Result<Verdict, sqlx::Error> {
521 
    let rows = pdb::reviews(&app.db, loaded.row.id).await?;
522 
    let links = accounts::identity_accounts(&app.db).await?;
523 
    let sealed_accounts: Vec<String> = links.iter().filter(|(k, _)| loaded.sealing_keys.contains(k)).map(|(_, u)| u.clone()).collect();
524 
    // Latest verdict per reviewer.
525 
    let mut latest: BTreeMap<String, &pdb::ReviewRow> = BTreeMap::new();
526 
    for r in rows.iter().filter(|r| r.via.is_empty()) {
527 
        // An assistant's answer is never the person's own verdict.
528 
        latest.insert(r.author.clone(), r);
529 
    }
530 
    let mut approvals = Vec::new();
531 
    for (who, r) in &latest {
532 
        if r.verdict == "approve" {
533 
            let sealed = sealed_accounts.contains(who);
534 
            let key = links.iter().find(|(k, u)| u == who && loaded.sealing_keys.contains(k)).map(|(k, _)| k.clone());
535 
            approvals.push(Approval { account: who.clone(), sealed, key });
536 
        }
537 
    }
538 
    let reviews = rows
539 
        .iter()
540 
        .map(|r| ReviewView {
541 
            row: r.clone(),
542 
            body_html: render::markdown::render(&r.body, "/", "/"),
543 
            sealed: r.verdict == "approve" && sealed_accounts.contains(&r.author),
544 
        })
545 
        .collect();
546 
    let requirements = pdb::requirements(&app.db, repo_id).await?;
547 
    let mut blockers = Vec::new();
548 
    // Only an open proposal can be held back.
549 
    if !loaded.row.is_open() {
550 
        return Ok(Verdict { reviews, approvals, blockers, depends_on: vec![], requirements });
551 
    }
552 
    if loaded.row.state == "draft" {
553 
        blockers.push("the proposal is a draft".into());
554 
    }
555 
    if loaded.hashes.is_empty() {
556 
        blockers.push("the proposal adds no changes".into());
557 
    }
558 
    let sealed_count = approvals.iter().filter(|a| a.sealed).count() as i64;
559 
    if sealed_count < requirements.required_approvals {
560 
        blockers.push(format!("{sealed_count} of {} required sealed approvals", requirements.required_approvals));
561 
    }
562 
    if requirements.require_owners {
563 
        let missing: Vec<&String> = loaded.owners.iter().filter(|o| !approvals.iter().any(|a| a.sealed && &a.account == *o)).collect();
564 
        if !missing.is_empty() {
565 
            blockers.push(format!("code owners still to approve: {}", missing.iter().map(|s| s.as_str()).collect::<Vec<_>>().join(", ")));
566 
        }
567 
    }
568 
    if loaded.conflicted && !requirements.allow_conflicts {
569 
        blockers.push("landing would carry conflicts, which this repository refuses".into());
570 
    }
571 
    let required = db::hooks::required_checks(&app.db, repo_id).await?;
572 
    if !required.is_empty() {
573 
        let checks = db::hooks::checks_for_state(&app.db, repo_id, &loaded.state).await?;
574 
        let missing: Vec<String> =
575 
            required.iter().filter(|n| !checks.iter().any(|c| &c.name == *n && c.status == "passed")).cloned().collect();
576 
        if !missing.is_empty() {
577 
            blockers.push(format!("required checks not passed on the projected state: {}", missing.join(", ")));
578 
        }
579 
    }
580 
    let requesting: Vec<&String> = latest.iter().filter(|(_, r)| r.verdict == "changes").map(|(who, _)| who).collect();
581 
    if !requesting.is_empty() {
582 
        blockers.push(format!("changes requested by {}", requesting.iter().map(|s| s.as_str()).collect::<Vec<_>>().join(", ")));
583 
    }
584 
    // Stacking: another open, earlier proposal whose changes this one includes.
585 
    let mut depends_on = Vec::new();
586 
    for other in pdb::list(&app.db, repo_id, &["open", "draft"]).await? {
587 
        if other.id == loaded.row.id || other.number > loaded.row.number {
588 
            continue;
589 
        }
590 
        let theirs = other.projected_changes();
591 
        if !theirs.is_empty() && theirs.iter().all(|h| loaded.hashes.iter().any(|m| m.to_hex() == *h)) {
592 
            depends_on.push(other.number);
593 
        }
594 
    }
595 
    if !depends_on.is_empty() {
596 
        blockers.push(format!("depends on {}", depends_on.iter().map(|n| format!("#{n}")).collect::<Vec<_>>().join(", ")));
597 
    }
598 
    Ok(Verdict { reviews, approvals, blockers, depends_on, requirements })
599 
}
600
601 
#[derive(Template)]
602 
#[template(path = "proposal.html")]
603 
pub struct ProposalPage {
604 
    shell: Shell,
605 
    repo: RepoShell,
606 
    p: pdb::ProposalRow,
607 
    /// Issues it closes, from its description and its changes.
608 
    closes: Vec<super::chain::Link>,
609 
    /// Projects the viewer may add it to.
610 
    project_choices: Option<Vec<db::projects::Project>>,
611 
    /// Comments (not anchored to a line), reviews and events, oldest first.
612 
    timeline: Vec<Entry>,
613 
    /// The viewer may set labels (triage or above).
614 
    can_triage: bool,
615 
    body_html: String,
616 
    tab: String,
617 
    changes: Vec<ChangeView>,
618 
    files: Vec<FileRows>,
619 
    diffs: Vec<oxy_core::repo::FileDiff>,
620 
    bases: std::collections::BTreeMap<String, Vec<u8>>,
621 
    /// Whitespace-only changes are hidden (`?w=1`).
622 
    ignore_ws: bool,
623 
    conflicts: Vec<ConflictView>,
624 
    conflicted: bool,
625 
    comments: Vec<CommentView>,
626 
    /// Anchored comments by (path, current line).
627 
    placed: HashMap<(String, usize), Vec<usize>>,
628 
    outdated: Vec<usize>,
629 
    reviews: Vec<ReviewView>,
630 
    approvals: Vec<Approval>,
631 
    blockers: Vec<String>,
632 
    depends_on: Vec<i64>,
633 
    events: Vec<pdb::EventRow>,
634 
    owners: Vec<String>,
635 
    requirements: pdb::Requirements,
636 
    landed_already: bool,
637 
    can_edit: bool,
638 
    /// The landed proposal's source bookmark, when it is this repository's,
639 
    /// still there, and the viewer may delete it (oxygenhub#86).
640 
    deletable_source: Option<String>,
641 
    can_land: bool,
642 
    hub_can_land: bool,
643 
    notice: Option<String>,
644 
    error: Option<String>,
645 
    heads: Vec<String>,
646 
    state_hash: String,
647 
    source_label: String,
648 
    api_url: String,
649 
    labels: Vec<db::issues::Label>,
650 
    all_labels: Vec<db::issues::Label>,
651 
    checks: Vec<db::hooks::Check>,
652 
    required_checks: Vec<String>,
653 
    /// Projects this proposal is on that the viewer may see, with the column.
654 
    projects: Vec<(db::projects::Project, String)>,
655 
    /// Asked to review and not yet reviewing.
656 
    requested: Vec<String>,
657 
    /// Who can be asked to review, for the sidebar's menu (oxygenhub#84).
658 
    reviewable: Vec<String>,
659 
    /// The viewer may ask for reviews (the author, or a writer).
660 
    can_request: bool,
661 
    /// AI assistants the viewer may ask, by name (hub spec §13.4).
662 
    assistants: Vec<String>,
663 
    /// A description an assistant just drafted, for the editor.
664 
    draft: Option<String>,
665 
}
666
667 
#[derive(Deserialize)]
668 
pub struct DetailQuery {
669 
    tab: Option<String>,
670 
    /// What an action said, after it redirected here.
671 
    #[serde(default)]
672 
    notice: Option<String>,
673 
    #[serde(default)]
674 
    error: Option<String>,
675 
    #[serde(default)]
676 
    w: Option<String>,
677 
}
678
679 
/// The page assembler every action ends in; its arguments are the route
680 
/// plus what to say, and a struct would only rename them.
681 
#[allow(clippy::too_many_arguments)]
682 
async fn detail(
683 
    app: &Shared,
684 
    shell: Shell,
685 
    viewer: &Viewer,
686 
    owner: &str,
687 
    name: &str,
688 
    number: i64,
689 
    tab: String,
690 
    notice: Option<String>,
691 
    error: Option<String>,
692 
) -> Result<Page<ProposalPage>, Error> {
693 
    let (repo, row, role) = lookup(app, &shell, viewer, owner, name).await?;
694 
    let p = pdb::get(&app.db, row.id, number)
695 
        .await
696 
        .map_err(|e| Error::from_db(shell.clone(), e))?
697 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
698 
    let loaded = load(app, &repo, p).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
699 
    // A proposal whose changes all reached the target landed by another route.
700 
    if loaded.landed_already && loaded.row.is_open() {
701 
        pdb::set_state(&app.db, loaded.row.id, "landed", &loaded.target_state).await.ok();
702 
        pdb::add_event(&app.db, loaded.row.id, "", "landed", "every change reached the target").await.ok();
703 
    }
704 
    let p = pdb::get(&app.db, row.id, number).await.map_err(|e| Error::from_db(shell.clone(), e))?.unwrap_or(loaded.row.clone());
705 
    let v = verdict(app, &loaded, row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
706 
    let comment_rows = pdb::comments(&app.db, loaded.row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
707 
    let events = pdb::events(&app.db, loaded.row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
708 
    // Place anchored comments at their atom's current line.
709 
    let mut by_atom: HashMap<(String, String, u32), usize> = HashMap::new();
710 
    for ((path, line), (h, i)) in &loaded.atoms {
711 
        by_atom.insert((path.clone(), h.clone(), *i), *line);
712 
    }
713 
    let mut comments = Vec::new();
714 
    let mut placed: HashMap<(String, usize), Vec<usize>> = HashMap::new();
715 
    let mut outdated = Vec::new();
716 
    for (idx, c) in comment_rows.into_iter().enumerate() {
717 
        let line = if c.anchor_change.is_empty() {
718 
            None
719 
        } else {
720 
            by_atom.get(&(c.path.clone(), c.anchor_change.clone(), c.anchor_index as u32)).copied()
721 
        };
722 
        if !c.anchor_change.is_empty() {
723 
            match line {
724 
                Some(l) => placed.entry((c.path.clone(), l)).or_default().push(idx),
725 
                None => outdated.push(idx),
726 
            }
727 
        }
728 
        comments.push(CommentView { body_html: render::markdown::render(&c.body, "/", "/"), row: c, line });
729 
    }
730 
    let mut changes = loaded.changes.clone();
731 
    super::attribute(app, &mut changes.iter_mut().collect::<Vec<_>>()).await;
732 
    let me = viewer.account();
733 
    let can_edit = me.is_some_and(|a| Some(a.id) == p.author_id || role >= Role::Maintain);
734 
    let deletable_source =
735 
        if p.state == "landed" && p.source_kind == "bookmark" && role >= Role::Write && p.source_bookmark != row.default_bookmark {
736 
            let b = p.source_bookmark.clone();
737 
            app.repos
738 
                .read(&repo, move |r, _| Ok(r.view()?.bookmarks.contains_key(&b)))
739 
                .await
740 
                .unwrap_or(false)
741 
                .then(|| p.source_bookmark.clone())
742 
        } else {
743 
            None
744 
        };
745 
    let can_land = role >= Role::Write && p.is_open() && v.blockers.is_empty();
746 
    let can_request = p.is_open() && me.is_some_and(|a| Some(a.id) == p.author_id || role >= Role::Write);
747 
    let requested = pdb::review_requests(&app.db, p.id).await.unwrap_or_default();
748 
    let mut reviewable: Vec<String> = if can_request {
749 
        accounts::assignable(&app.db, row.id, &row.owner).await.unwrap_or_default().into_iter().filter(|u| *u != p.author).collect()
750 
    } else {
751 
        Vec::new()
752 
    };
753 
    for r in &requested {
754 
        if !reviewable.iter().any(|x| x.eq_ignore_ascii_case(r)) {
755 
            reviewable.push(r.clone());
756 
        }
757 
    }
758 
    let assistants: Vec<String> = if (can_request || can_edit) && p.is_open() { assistant_names(app, &row).await } else { Vec::new() };
759 
    let delegated = match viewer.account() {
760 
        Some(a) => super::edit::delegated_identity(app, a.id).await.is_some(),
761 
        None => false,
762 
    };
763 
    let hub_can_land = delegated || app.repos.read(&repo, |r, _| Ok(r.current_policy()?.is_none())).await.unwrap_or(false);
764 
    let source_label = match p.source_kind.as_str() {
765 
        "fork" => format!(
766 
            "fork {}",
767 
            db::repos::get_by_id(&app.db, p.source_repo_id.unwrap_or(0))
768 
                .await
769 
                .ok()
770 
                .flatten()
771 
                .map(|r| format!("{}:{}", r.slug(), p.source_bookmark))
772 
                .unwrap_or_default()
773 
        ),
774 
        "changes" => format!("{} changes", p.source_changes().len()),
775 
        _ => p.source_bookmark.clone(),
776 
    };
777 
    let projects = super::projects::placements_for(app, viewer, &row, p.number).await;
778 
    let texts: Vec<String> = std::iter::once(p.body.clone()).chain(changes.iter().map(|c| format!("{}\n{}", c.title, c.body))).collect();
779 
    let closes = super::chain::issues_closed_by(app, &row, &texts.iter().map(String::as_str).collect::<Vec<_>>()).await;
780 
    let project_choices = super::projects::project_choices(app, viewer, &row, &projects).await;
781 
    let mut dated: Vec<(i64, Entry)> = Vec::new();
782 
    for (index, c) in comments.iter().enumerate() {
783 
        if c.row.anchor_change.is_empty() {
784 
            dated.push((c.row.created_ms, Entry { kind: "comment", index }));
785 
        }
786 
    }
787 
    for (index, r) in v.reviews.iter().enumerate() {
788 
        dated.push((r.row.created_ms, Entry { kind: "review", index }));
789 
    }
790 
    for (index, e) in events.iter().enumerate() {
791 
        dated.push((e.at_ms, Entry { kind: "event", index }));
792 
    }
793 
    dated.sort_by_key(|(at, _)| *at);
794 
    let timeline: Vec<Entry> = dated.into_iter().map(|(_, e)| e).collect();
795 
    Ok(Page(ProposalPage {
796 
        can_triage: role >= Role::Triage,
797 
        timeline,
798 
        closes,
799 
        project_choices,
800 
        projects,
801 
        shell,
802 
        repo: RepoShell::new(app, &row, "proposals").with_role(role),
803 
        body_html: super::issues::markdown(app, &row, &row.default_bookmark, &p.body).await,
804 
        p,
805 
        tab,
806 
        changes,
807 
        files: loaded.files,
808 
        diffs: loaded.diffs,
809 
        bases: loaded.bases,
810 
        ignore_ws: false,
811 
        conflicts: loaded.conflicts,
812 
        conflicted: loaded.conflicted,
813 
        comments,
814 
        placed,
815 
        outdated,
816 
        reviews: v.reviews,
817 
        approvals: v.approvals,
818 
        blockers: v.blockers,
819 
        depends_on: v.depends_on,
820 
        events,
821 
        owners: loaded.owners,
822 
        requirements: v.requirements,
823 
        landed_already: loaded.landed_already,
824 
        can_edit,
825 
        deletable_source,
826 
        can_land,
827 
        hub_can_land,
828 
        notice,
829 
        error,
830 
        heads: loaded.heads.iter().map(|h| h.to_hex()).collect(),
831 
        state_hash: loaded.state.clone(),
832 
        source_label,
833 
        api_url: format!("{}/api/v1/repos/{owner}/{name}/proposals/{number}", app.config.base_url()),
834 
        labels: db::issues::proposal_labels(&app.db, loaded.row.id).await.unwrap_or_default(),
835 
        all_labels: db::issues::labels(&app.db, row.id).await.unwrap_or_default(),
836 
        checks: db::hooks::checks_for_state(&app.db, row.id, &loaded.state).await.unwrap_or_default(),
837 
        required_checks: db::hooks::required_checks(&app.db, row.id).await.unwrap_or_default(),
838 
        requested,
839 
        reviewable,
840 
        assistants,
841 
        draft: None,
842 
        can_request,
843 
    }))
844 
}
845
846 
/// Back to the proposal after an action, with what to say: a redirect, so
847 
/// reloading the page (the checks script does) never repeats the action.
848 
fn back(owner: &str, name: &str, number: i64, tab: &str, notice: Option<String>, error: Option<String>) -> Response {
849 
    let mut url = format!("/{owner}/{name}/proposal/{number}?tab={tab}");
850 
    if let Some(n) = notice {
851 
        url.push_str(&format!("&notice={}", super::settings::urlencode(&n)));
852 
    }
853 
    if let Some(e) = error {
854 
        url.push_str(&format!("&error={}", super::settings::urlencode(&e)));
855 
    }
856 
    Redirect::to(&url).into_response()
857 
}
858
859 
pub async fn show(
860 
    State(app): State<Shared>,
861 
    viewer: Viewer,
862 
    Path((owner, name, number)): Path<(String, String, i64)>,
863 
    Query(q): Query<DetailQuery>,
864 
) -> Result<Page<ProposalPage>, Error> {
865 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
866 
    let mut page =
867 
        detail(&app, shell, &viewer, &owner, &name, number, q.tab.unwrap_or_else(|| "conversation".into()), q.notice, q.error).await?;
868 
    if q.w.as_deref() == Some("1") {
869 
        // Hide whitespace-only changes: the same hunks, rendered again.
870 
        page.0.files =
871 
            super::history::render_files_with(&page.0.diffs, &page.0.bases, crate::render::diff::Options { ignore_whitespace: true });
872 
        page.0.ignore_ws = true;
873 
    }
874 
    Ok(page)
875 
}
876
877 
// ---------------------------------------------------------------- actions
878
879 
#[derive(Deserialize)]
880 
pub struct CommentForm {
881 
    #[serde(rename = "_csrf")]
882 
    csrf_token: String,
883 
    body: String,
884 
    #[serde(default)]
885 
    path: String,
886 
    #[serde(default)]
887 
    line: Option<usize>,
888 
}
889
890 
pub async fn comment(
891 
    State(app): State<Shared>,
892 
    viewer: Viewer,
893 
    Path((owner, name, number)): Path<(String, String, i64)>,
894 
    Form(f): Form<CommentForm>,
895 
) -> Result<Response, Error> {
896 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
897 
    let me = require(&viewer, &shell)?;
898 
    csrf(&viewer, &f.csrf_token, &shell)?;
899 
    let (repo, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
900 
    let p = pdb::get(&app.db, row.id, number)
901 
        .await
902 
        .map_err(|e| Error::from_db(shell.clone(), e))?
903 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
904 
    if f.body.trim().is_empty() {
905 
        return Ok(back(&owner, &name, number, "conversation", None, Some("An empty comment says nothing.".into())));
906 
    }
907 
    let anchor = match (f.path.trim(), f.line) {
908 
        ("", _) | (_, None) => None,
909 
        (path, Some(line)) => {
910 
            let loaded = load(&app, &repo, p.clone()).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
911 
            loaded.atoms.get(&(path.to_string(), line)).cloned()
912 
        }
913 
    };
914 
    let tab = if anchor.is_some() { "files" } else { "conversation" };
915 
    pdb::add_comment(
916 
        &app.db,
917 
        p.id,
918 
        Some(me.account.id),
919 
        &me.account.username,
920 
        f.body.trim(),
921 
        f.path.trim(),
922 
        anchor.as_ref().map(|(h, i)| (h.as_str(), *i as i64)),
923 
    )
924 
    .await
925 
    .map_err(|e| Error::from_db(shell.clone(), e))?;
926 
    Ok(back(&owner, &name, number, tab, None, None))
927 
}
928
929 
#[derive(Deserialize)]
930 
pub struct ReviewForm {
931 
    #[serde(rename = "_csrf")]
932 
    csrf_token: String,
933 
    verdict: String,
934 
    #[serde(default)]
935 
    body: String,
936 
}
937
938 
pub async fn review(
939 
    State(app): State<Shared>,
940 
    viewer: Viewer,
941 
    Path((owner, name, number)): Path<(String, String, i64)>,
942 
    Form(f): Form<ReviewForm>,
943 
) -> Result<Response, Error> {
944 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
945 
    let me = require(&viewer, &shell)?;
946 
    csrf(&viewer, &f.csrf_token, &shell)?;
947 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
948 
    let p = pdb::get(&app.db, row.id, number)
949 
        .await
950 
        .map_err(|e| Error::from_db(shell.clone(), e))?
951 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
952 
    if !matches!(f.verdict.as_str(), "comment" | "changes" | "approve") {
953 
        return Err(Error::bad(shell, "a review is comment, changes or approve"));
954 
    }
955 
    if f.verdict == "approve" && Some(me.account.id) == p.author_id {
956 
        return Ok(back(&owner, &name, number, "conversation", None, Some("You cannot approve your own proposal.".into())));
957 
    }
958 
    pdb::add_review(&app.db, p.id, me.account.id, &me.account.username, &f.verdict, f.body.trim())
959 
        .await
960 
        .map_err(|e| Error::from_db(shell.clone(), e))?;
961 
    pdb::add_event(&app.db, p.id, &me.account.username, &format!("review.{}", f.verdict), "").await.ok();
962 
    reviewed(&app, &row, &p, &me.account, &f.verdict).await;
963 
    crate::hooks::emit(&app, &row, "review", &me.account.username, serde_json::json!({ "number": number, "verdict": f.verdict })).await;
964 
    let notice = if f.verdict == "approve" {
965 
        Some(format!(
966 
            "Approval recorded. It counts once you seal the changes: oxy seal --proposal {}/{owner}/{name}/proposal/{number}",
967 
            app.config.base_url()
968 
        ))
969 
    } else {
970 
        None
971 
    };
972 
    Ok(back(&owner, &name, number, "conversation", notice, None))
973 
}
974
975 
#[derive(Deserialize)]
976 
pub struct EditForm {
977 
    #[serde(rename = "_csrf")]
978 
    csrf_token: String,
979 
    title: String,
980 
    #[serde(default)]
981 
    body: String,
982 
    target: String,
983 
}
984
985 
pub async fn edit(
986 
    State(app): State<Shared>,
987 
    viewer: Viewer,
988 
    Path((owner, name, number)): Path<(String, String, i64)>,
989 
    Form(f): Form<EditForm>,
990 
) -> Result<Response, Error> {
991 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
992 
    let me = require(&viewer, &shell)?;
993 
    csrf(&viewer, &f.csrf_token, &shell)?;
994 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
995 
    let p = pdb::get(&app.db, row.id, number)
996 
        .await
997 
        .map_err(|e| Error::from_db(shell.clone(), e))?
998 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
999 
    if Some(me.account.id) != p.author_id && role < Role::Maintain {
1000 
        return Err(Error::not_found(shell));
1001 
    }
1002 
    let target = if crate::repos::names::valid_segment(f.target.trim()) { f.target.trim() } else { &p.target };
1003 
    pdb::edit(&app.db, p.id, f.title.trim(), f.body.trim(), target).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1004 
    pdb::add_event(&app.db, p.id, &me.account.username, "edited", "").await.ok();
1005 
    Ok(back(&owner, &name, number, "conversation", Some("Saved.".into()), None))
1006 
}
1007
1008 
#[derive(Deserialize)]
1009 
pub struct StateForm {
1010 
    #[serde(rename = "_csrf")]
1011 
    csrf_token: String,
1012 
    action: String,
1013 
}
1014
1015 
pub async fn state(
1016 
    State(app): State<Shared>,
1017 
    viewer: Viewer,
1018 
    Path((owner, name, number)): Path<(String, String, i64)>,
1019 
    Form(f): Form<StateForm>,
1020 
) -> Result<Response, Error> {
1021 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1022 
    let me = require(&viewer, &shell)?;
1023 
    csrf(&viewer, &f.csrf_token, &shell)?;
1024 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1025 
    let p = pdb::get(&app.db, row.id, number)
1026 
        .await
1027 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1028 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1029 
    if Some(me.account.id) != p.author_id && role < Role::Triage {
1030 
        return Err(Error::not_found(shell));
1031 
    }
1032 
    let new_state = match (f.action.as_str(), p.state.as_str()) {
1033 
        ("close", "open" | "draft") => "closed",
1034 
        ("reopen", "closed") => "open",
1035 
        ("ready", "draft") => "open",
1036 
        ("draft", "open") => "draft",
1037 
        _ => return Err(Error::bad(shell, "that transition is not possible")),
1038 
    };
1039 
    pdb::set_state(&app.db, p.id, new_state, "").await.map_err(|e| Error::from_db(shell.clone(), e))?;
1040 
    pdb::add_event(&app.db, p.id, &me.account.username, new_state, "").await.ok();
1041 
    crate::hooks::emit(&app, &row, &format!("proposal.{new_state}"), &me.account.username, serde_json::json!({ "number": number })).await;
1042 
    Ok(back(&owner, &name, number, "conversation", None, None))
1043 
}
1044
1045 
pub async fn resolve_comment(
1046 
    State(app): State<Shared>,
1047 
    viewer: Viewer,
1048 
    Path((owner, name, number, id)): Path<(String, String, i64, i64)>,
1049 
    Form(f): Form<super::session::CsrfForm>,
1050 
) -> Result<Response, Error> {
1051 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1052 
    require(&viewer, &shell)?;
1053 
    csrf(&viewer, &f.csrf, &shell)?;
1054 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1055 
    let p = pdb::get(&app.db, row.id, number)
1056 
        .await
1057 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1058 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1059 
    let current: Option<bool> = sqlx::query_scalar("SELECT resolved FROM proposal_comments WHERE id = ? AND proposal_id = ?")
1060 
        .bind(id)
1061 
        .bind(p.id)
1062 
        .fetch_optional(&app.db)
1063 
        .await
1064 
        .map_err(|e| Error::from_db(shell.clone(), e))?;
1065 
    if let Some(r) = current {
1066 
        pdb::set_comment_resolved(&app.db, id, !r).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1067 
    }
1068 
    Ok(back(&owner, &name, number, "files", None, None))
1069 
}
1070
1071 
/// Land from the hub: only when the repository has no trust policy (the
1072 
/// hub never signs a reference update the policy would have to admit).
1073 
pub async fn land(
1074 
    State(app): State<Shared>,
1075 
    viewer: Viewer,
1076 
    Path((owner, name, number)): Path<(String, String, i64)>,
1077 
    Form(f): Form<super::session::CsrfForm>,
1078 
) -> Result<Response, Error> {
1079 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1080 
    let me = require(&viewer, &shell)?;
1081 
    csrf(&viewer, &f.csrf, &shell)?;
1082 
    let (repo, row, _) = lookup_role(&app, &shell, &viewer, &owner, &name, Access::Write).await?;
1083 
    match land_as(&app, &repo, &row, &me.account, number, "web").await {
1084 
        Ok(_) => Ok(back(&owner, &name, number, "conversation", Some("Landed.".into()), None)),
1085 
        Err(Landing::NotFound) => Err(Error::not_found(shell)),
1086 
        Err(Landing::Refused(m)) => Ok(back(&owner, &name, number, "conversation", None, Some(m))),
1087 
    }
1088 
}
1089
1090 
/// Why a proposal did not land.
1091 
pub enum Landing {
1092 
    NotFound,
1093 
    Refused(String),
1094 
}
1095
1096 
/// Land proposal `number` as `me` (hub spec §8.4), who has write access:
1097 
/// refused while it is not open or has blockers. Moves the target bookmark
1098 
/// (attested by the hub key on `me`'s behalf when they delegated to it),
1099 
/// then records, announces and audits the landing, saying how it was done
1100 
/// (`via`: `web`, or `api (token NAME)`). Returns the new state.
1101 
pub async fn land_as(
1102 
    app: &Shared,
1103 
    repo: &RepoName,
1104 
    row: &db::repos::RepoRow,
1105 
    me: &accounts::Account,
1106 
    number: i64,
1107 
    via: &str,
1108 
) -> Result<String, Landing> {
1109 
    let (owner, name) = (row.owner.clone(), row.name.clone());
1110 
    let refused = |e: String| Landing::Refused(e);
1111 
    let p = pdb::get(&app.db, row.id, number).await.map_err(|e| refused(e.to_string()))?.ok_or(Landing::NotFound)?;
1112 
    let loaded = load(app, repo, p.clone()).await.map_err(|e| refused(e.to_string()))?;
1113 
    let v = verdict(app, &loaded, row.id).await.map_err(|e| refused(e.to_string()))?;
1114 
    if !p.is_open() {
1115 
        return Err(refused(format!("Cannot land: the proposal is {}", p.state)));
1116 
    }
1117 
    if !v.blockers.is_empty() {
1118 
        return Err(refused(format!("Cannot land: {}", v.blockers.join("; "))));
1119 
    }
1120 
    let target = p.target.clone();
1121 
    let heads = loaded.heads.clone();
1122 
    // With a delegation the landing is attested by the hub key on the
1123 
    // user's behalf, which a policy accepts when it lets the user update
1124 
    // the target (spec §14.5); without one, only a policy-free repository
1125 
    // can be landed here.
1126 
    let result = match super::edit::signer_for(app, me.id).await {
1127 
        Ok(signer) => crate::repos::edits::move_bookmark(&app.repos, repo, target.clone(), heads.clone(), signer).await.map(|_| pl::state_ref(&heads).to_hex()),
1128 
        Err(why) => {
1129 
            app.repos
1130 
                .write(repo, move |r, _| {
1131 
                    if r.current_policy()?.is_some() {
1132 
                        return Err(crate::repos::RepoError::Oxy(oxy_core::repo::RepoError::Msg(format!(
1133 
                            "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}"
1134 
                        ))));
1135 
                    }
1136 
                    r.bookmark_set(&target, &heads)?;
1137 
                    Ok(pl::state_ref(&heads).to_hex())
1138 
                })
1139 
                .await
1140 
        }
1141 
    };
1142 
    let state = result.map_err(|e| refused(e.to_string()))?;
1143 
    pdb::set_landed(&app.db, p.id, &state, &me.username, via).await.map_err(|e| refused(e.to_string()))?;
1144 
    let how = if v.approvals.is_empty() { format!("{via}, with no approval") } else { via.to_string() };
1145 
    pdb::add_event(&app.db, p.id, &me.username, "landed", &how).await.ok();
1146 
    crate::hooks::emit(
1147 
        app,
1148 
        row,
1149 
        "proposal.landed",
1150 
        &me.username,
1151 
        serde_json::json!({ "number": number, "target": p.target, "state": state }),
1152 
    )
1153 
    .await;
1154 
    crate::notify::deliver(
1155 
        app,
1156 
        crate::notify::Event {
1157 
            kind: "proposal.landed",
1158 
            title: format!("{owner}/{name}#{number}: {} landed", p.title),
1159 
            url: format!("/{owner}/{name}/proposal/{number}"),
1160 
            actor: me,
1161 
            repo_id: row.id,
1162 
            thread: Some(("proposal", p.id)),
1163 
            mention_text: "",
1164 
            direct: p.author_id.into_iter().collect(),
1165 
        },
1166 
    )
1167 
    .await;
1168 
    if p.target == row.default_bookmark {
1169 
        let messages: Vec<(String, String)> = loaded.changes.iter().map(|c| (c.hash.clone(), format!("{}\n{}", c.title, c.body))).collect();
1170 
        super::issues::close_from_messages(app, row, &messages).await;
1171 
    }
1172 
    accounts::audit(&app.db, Some(me), "proposal.landed", &format!("{owner}/{name}#{number}"), &how).await.ok();
1173 
    db::repos::record_push(
1174 
        &app.db,
1175 
        row.id,
1176 
        Some((me.id, me.username.as_str())),
1177 
        &[db::repos::PushOutcome {
1178 
            reference: p.target.clone(),
1179 
            ok: true,
1180 
            reason: format!("landed #{number} ({how})"),
1181 
            old_state: loaded.target_state.clone(),
1182 
            new_state: state.clone(),
1183 
            heads: loaded.heads.len() as i64,
1184 
            changes: loaded.hashes.len() as i64,
1185 
        }],
1186 
    )
1187 
    .await
1188 
    .ok();
1189 
    Ok(state)
1190 
}
1191
1192 
#[derive(Deserialize)]
1193 
pub struct LabelsForm {
1194 
    #[serde(rename = "_csrf")]
1195 
    csrf_token: String,
1196 
    #[serde(default)]
1197 
    label: Vec<i64>,
1198 
}
1199
1200 
pub async fn set_labels(
1201 
    State(app): State<Shared>,
1202 
    viewer: Viewer,
1203 
    Path((owner, name, number)): Path<(String, String, i64)>,
1204 
    axum_extra::extract::Form(f): axum_extra::extract::Form<LabelsForm>,
1205 
) -> Result<Response, Error> {
1206 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1207 
    require(&viewer, &shell)?;
1208 
    csrf(&viewer, &f.csrf_token, &shell)?;
1209 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1210 
    if role < Role::Triage {
1211 
        return Err(Error::not_found(shell));
1212 
    }
1213 
    let p = pdb::get(&app.db, row.id, number)
1214 
        .await
1215 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1216 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1217 
    for l in db::issues::labels(&app.db, row.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {
1218 
        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))?;
1219 
    }
1220 
    Ok(back(&owner, &name, number, "conversation", None, None))
1221 
}
1222
1223 
/// `GET /{owner}/{name}/proposal/{number}/events`: server-sent events for
1224 
/// checks on the projected state (hub spec §13.1).
1225 
pub async fn events(
1226 
    State(app): State<Shared>,
1227 
    viewer: Viewer,
1228 
    Path((owner, name, number)): Path<(String, String, i64)>,
1229 
) -> Result<axum::response::Sse<impl futures::Stream<Item = Result<axum::response::sse::Event, std::convert::Infallible>>>, Error> {
1230 
    use futures::StreamExt;
1231 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1232 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1233 
    let rx = app.events.proposals.subscribe();
1234 
    let repo_id = row.id;
1235 
    let stream = tokio_stream::wrappers::BroadcastStream::new(rx).filter_map(move |item| async move {
1236 
        match item {
1237 
            Ok((id, ev)) if id == repo_id => {
1238 
                Some(Ok(axum::response::sse::Event::default().event(ev.kind.clone()).data(serde_json::to_string(&ev).unwrap_or_default())))
1239 
            }
1240 
            _ => None,
1241 
        }
1242 
    });
1243 
    Ok(axum::response::Sse::new(stream).keep_alive(axum::response::sse::KeepAlive::default()))
1244 
}
1245
1246 
// -------------------------------------------------------------------- API
1247
1248 
pub async fn to_api(app: &Shared, owner: &str, name: &str, loaded: &Loaded, v: &Verdict, source_url: Option<String>) -> hub_api::Proposal {
1249 
    let p = &loaded.row;
1250 
    hub_api::Proposal {
1251 
        number: p.number,
1252 
        title: p.title.clone(),
1253 
        body: p.body.clone(),
1254 
        author: p.author.clone(),
1255 
        state: ProposalState::parse(&p.state).unwrap_or(ProposalState::Open),
1256 
        target: p.target.clone(),
1257 
        source: match p.source_kind.as_str() {
1258 
            "fork" => {
1259 
                let (o, n) = source_url
1260 
                    .as_deref()
1261 
                    .and_then(|u| u.rsplit_once('/'))
1262 
                    .and_then(|(b, n)| b.rsplit_once('/').map(|(_, o)| (o.to_string(), n.to_string())))
1263 
                    .unwrap_or_default();
1264 
                ProposalSource::Fork { owner: o, name: n, bookmark: p.source_bookmark.clone() }
1265 
            }
1266 
            "changes" => ProposalSource::Changes { hashes: p.source_changes() },
1267 
            _ => ProposalSource::Bookmark { bookmark: p.source_bookmark.clone() },
1268 
        },
1269 
        changes: loaded
1270 
            .changes
1271 
            .iter()
1272 
            .map(|c| hub_api::ChangeSummary {
1273 
                hash: c.hash.clone(),
1274 
                message: if c.body.is_empty() { c.title.clone() } else { format!("{}\n\n{}", c.title, c.body) },
1275 
                author: hub_api::Author {
1276 
                    name: c.author.name.clone(),
1277 
                    email: c.author.email.clone(),
1278 
                    key: c.author.key.clone(),
1279 
                    account: c.author.account.clone(),
1280 
                    note: hub_api::Author::note_for(&c.author.key, &c.author.account),
1281 
                },
1282 
                when_ms: c.when_ms,
1283 
                deps: c.deps.clone(),
1284 
                head: c.head,
1285 
                via: c.via.as_ref().map(|v| hub_api::Via {
1286 
                    name: v.name.clone(),
1287 
                    key: v.key.clone(),
1288 
                    scope: v.scope.clone(),
1289 
                    expires_ms: v.expires_ms,
1290 
                    revoked: v.revoked,
1291 
                }),
1292 
                signature: match &c.signature {
1293 
                    view::SigView::Unsigned => hub_api::Signature::Unsigned,
1294 
                    view::SigView::Valid { key, sealed, revoked, .. } => {
1295 
                        hub_api::Signature::Valid { key: key.clone(), sealed: *sealed, revoked: *revoked }
1296 
                    }
1297 
                    view::SigView::Invalid(why) => hub_api::Signature::Invalid { reason: why.clone() },
1298 
                },
1299 
            })
1300 
            .collect(),
1301 
        projected_heads: loaded.heads.iter().map(|h| h.to_hex()).collect(),
1302 
        projected_state: Some(loaded.state.clone()),
1303 
        conflicted: loaded.conflicted,
1304 
        approvals: v.approvals.clone(),
1305 
        landable: p.is_open() && v.blockers.is_empty(),
1306 
        blockers: v.blockers.clone(),
1307 
        created_ms: p.created_ms,
1308 
        updated_ms: p.updated_ms,
1309 
        url: format!("{}/{owner}/{name}/proposal/{}", app.config.base_url(), p.number),
1310 
        repository_url: format!("{}/{owner}/{name}", app.config.base_url()),
1311 
        source_url,
1312 
        landed: (p.state == "landed" && p.landed_ms > 0).then(|| hub_api::Landed {
1313 
            by: p.landed_by.clone(),
1314 
            via: p.landed_via.clone(),
1315 
            when_ms: p.landed_ms,
1316 
        }),
1317 
        requested_reviewers: pdb::review_requests(&app.db, p.id).await.unwrap_or_default(),
1318 
        labels: db::issues::proposal_labels(&app.db, p.id)
1319 
            .await
1320 
            .unwrap_or_default()
1321 
            .into_iter()
1322 
            .map(|l| hub_api::Label { name: l.name, colour: l.colour, description: l.description })
1323 
            .collect(),
1324 
    }
1325 
}
1326
1327 
/// The line comment form's placement key, for templates.
1328 
pub fn key(path: &str, line: impl filters::Num) -> (String, usize) {
1329 
    (path.to_string(), line.as_u64() as usize)
1330 
}
1331
1332 
#[allow(dead_code)]
1333 
fn _unused(_: &diff::Line, _: &ConflictView, _: &Role) {}
1334
1335 
// ------------------------------------------------------- review requests
1336
1337 
/// Ask accounts to review a proposal (hub plan 0.4): each must exist, be
1338 
/// someone other than the author, and be able to read the repository. Each
1339 
/// newly asked is told, and the proposal records it. The usernames newly
1340 
/// asked, or why none could be.
1341 
pub async fn request_reviewers(
1342 
    app: &Shared,
1343 
    row: &db::repos::RepoRow,
1344 
    p: &pdb::ProposalRow,
1345 
    by: &accounts::Account,
1346 
    names: &[String],
1347 
) -> Result<Vec<String>, String> {
1348 
    let mut found = Vec::new();
1349 
    for name in names.iter().map(|n| n.trim().trim_start_matches('@')).filter(|n| !n.is_empty()) {
1350 
        let Some(a) = accounts::account_by_name(&app.db, name).await.ok().flatten() else {
1351 
            return Err(format!("There is no account {name}."));
1352 
        };
1353 
        if Some(a.id) == p.author_id {
1354 
            return Err(format!("{name} wrote this proposal, and cannot review it."));
1355 
        }
1356 
        let role = crate::auth::roles::role_for(&app.db, Some(&a), row).await.ok().flatten();
1357 
        if !crate::auth::roles::allows(role, crate::auth::Access::Read) {
1358 
            return Err(format!("{name} cannot read this repository."));
1359 
        }
1360 
        found.push(a);
1361 
    }
1362 
    let mut asked = Vec::new();
1363 
    for a in found {
1364 
        if !pdb::request_review(&app.db, p.id, a.id, &by.username).await.map_err(|e| e.to_string())? {
1365 
            continue;
1366 
        }
1367 
        pdb::add_event(&app.db, p.id, &by.username, "review requested", &a.username).await.ok();
1368 
        crate::notify::deliver(
1369 
            app,
1370 
            crate::notify::Event {
1371 
                kind: "proposal.review_requested",
1372 
                title: format!("{}/{}#{}: {} (review requested from {})", row.owner, row.name, p.number, p.title, a.username),
1373 
                url: format!("/{}/{}/proposal/{}", row.owner, row.name, p.number),
1374 
                actor: by,
1375 
                repo_id: row.id,
1376 
                thread: None,
1377 
                mention_text: "",
1378 
                direct: vec![a.id],
1379 
            },
1380 
        )
1381 
        .await;
1382 
        asked.push(a.username);
1383 
    }
1384 
    Ok(asked)
1385 
}
1386
1387 
/// After a review: it answers the reviewer's request, if there was one, and
1388 
/// the proposal's author is told.
1389 
pub async fn reviewed(app: &Shared, row: &db::repos::RepoRow, p: &pdb::ProposalRow, by: &accounts::Account, verdict: &str) {
1390 
    pdb::unrequest_review(&app.db, p.id, by.id).await.ok();
1391 
    let what = match verdict {
1392 
        "approve" => "approved",
1393 
        "changes" => "changes requested",
1394 
        _ => "reviewed",
1395 
    };
1396 
    crate::notify::deliver(
1397 
        app,
1398 
        crate::notify::Event {
1399 
            kind: "proposal.review",
1400 
            title: format!("{}/{}#{}: {} ({what} by {})", row.owner, row.name, p.number, p.title, by.username),
1401 
            url: format!("/{}/{}/proposal/{}", row.owner, row.name, p.number),
1402 
            actor: by,
1403 
            repo_id: row.id,
1404 
            thread: Some(("proposal", p.id)),
1405 
            mention_text: "",
1406 
            direct: p.author_id.into_iter().collect(),
1407 
        },
1408 
    )
1409 
    .await;
1410 
}
1411
1412 
#[derive(Deserialize)]
1413 
pub struct ReviewersForm {
1414 
    #[serde(rename = "_csrf")]
1415 
    csrf_token: String,
1416 
    /// `add`, `remove`, or `set` (the menu: exactly these are asked).
1417 
    action: String,
1418 
    #[serde(default)]
1419 
    username: Vec<String>,
1420 
}
1421
1422 
/// `POST /{owner}/{name}/proposal/{number}/reviewers`: the author or a
1423 
/// writer asks someone to review, or withdraws the request.
1424 
pub async fn reviewers(
1425 
    State(app): State<Shared>,
1426 
    viewer: Viewer,
1427 
    Path((owner, name, number)): Path<(String, String, i64)>,
1428 
    axum_extra::extract::Form(f): axum_extra::extract::Form<ReviewersForm>,
1429 
) -> Result<Response, Error> {
1430 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1431 
    let me = require(&viewer, &shell)?;
1432 
    csrf(&viewer, &f.csrf_token, &shell)?;
1433 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1434 
    let p = pdb::get(&app.db, row.id, number)
1435 
        .await
1436 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1437 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1438 
    if Some(me.account.id) != p.author_id && role < Role::Write {
1439 
        return Err(Error::not_found(shell));
1440 
    }
1441 
    let names: Vec<String> = f.username.iter().map(|n| n.trim().trim_start_matches('@').to_string()).filter(|n| !n.is_empty()).collect();
1442 
    let current = pdb::review_requests(&app.db, p.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1443 
    // Withdrawn: those named (remove), or those the menu left out (set).
1444 
    let withdraw: Vec<String> = match f.action.as_str() {
1445 
        "remove" => names.clone(),
1446 
        "set" => current.iter().filter(|c| !names.iter().any(|n| n.eq_ignore_ascii_case(c))).cloned().collect(),
1447 
        _ => Vec::new(),
1448 
    };
1449 
    for who in &withdraw {
1450 
        if let Some(a) = accounts::account_by_name(&app.db, who).await.ok().flatten() {
1451 
            if pdb::unrequest_review(&app.db, p.id, a.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {
1452 
                pdb::add_event(&app.db, p.id, &me.account.username, "review request withdrawn", &a.username).await.ok();
1453 
            }
1454 
        }
1455 
    }
1456 
    let ask: Vec<String> = match f.action.as_str() {
1457 
        "add" => names,
1458 
        "set" => names.into_iter().filter(|n| !current.iter().any(|c| c.eq_ignore_ascii_case(n))).collect(),
1459 
        _ => return Ok(back(&owner, &name, number, "conversation", None, None)),
1460 
    };
1461 
    if ask.is_empty() {
1462 
        return Ok(back(&owner, &name, number, "conversation", None, None));
1463 
    }
1464 
    match request_reviewers(&app, &row, &p, &me.account, &ask).await {
1465 
        Ok(asked) if asked.is_empty() => Ok(back(&owner, &name, number, "conversation", Some("Already asked.".into()), None)),
1466 
        Ok(asked) => Ok(back(&owner, &name, number, "conversation", Some(format!("Asked {} to review.", asked.join(", "))), None)),
1467 
        Err(e) => Ok(back(&owner, &name, number, "conversation", None, Some(e))),
1468 
    }
1469 
}
1470
1471 
#[derive(Deserialize)]
1472 
pub struct AssistantForm {
1473 
    #[serde(rename = "_csrf")]
1474 
    csrf_token: String,
1475 
    assistant: String,
1476 
}
1477
1478 
/// `POST /{owner}/{name}/proposal/{number}/assistant`: the author or a
1479 
/// writer asks an AI assistant to review (hub spec §13.4). The answer
1480 
/// comes later as a review via the assistant.
1481 
pub async fn assistant(
1482 
    State(app): State<Shared>,
1483 
    viewer: Viewer,
1484 
    Path((owner, name, number)): Path<(String, String, i64)>,
1485 
    Form(f): Form<AssistantForm>,
1486 
) -> Result<Response, Error> {
1487 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1488 
    let me = require(&viewer, &shell)?;
1489 
    csrf(&viewer, &f.csrf_token, &shell)?;
1490 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1491 
    let p = pdb::get(&app.db, row.id, number)
1492 
        .await
1493 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1494 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1495 
    if Some(me.account.id) != p.author_id && role < Role::Write {
1496 
        return Err(Error::not_found(shell));
1497 
    }
1498 
    if !p.is_open() {
1499 
        return Ok(back(&owner, &name, number, "conversation", None, Some("The proposal is not open.".into())));
1500 
    }
1501 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
1502 
        .await
1503 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1504 
        .into_iter()
1505 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
1506 
    else {
1507 
        return Ok(back(&owner, &name, number, "conversation", None, Some(format!("No assistant called {} here.", f.assistant.trim()))));
1508 
    };
1509 
    let who = a.name.clone();
1510 
    match crate::assistants::request_review(&app, &row, &p, &me.account, a).await {
1511 
        Ok(()) => Ok(back(
1512 
            &owner,
1513 
            &name,
1514 
            number,
1515 
            "conversation",
1516 
            Some(format!("Asked {who} to review; its answer appears here when it comes.")),
1517 
            None,
1518 
        )),
1519 
        Err(e) => Ok(back(&owner, &name, number, "conversation", None, Some(format!("Not asked: {e}.")))),
1520 
    }
1521 
}
1522
1523 
/// The assistants a repository may use, by name.
1524 
async fn assistant_names(app: &Shared, row: &db::repos::RepoRow) -> Vec<String> {
1525 
    crate::assistants::enabled_for_repo(&app.db, row).await.unwrap_or_default().into_iter().map(|a| a.name).collect()
1526 
}
1527
1528 
/// The changes and the file diffs a proposal from `source` into `target`
1529 
/// would carry.
1530 
async fn preview_diff(
1531 
    app: &Shared,
1532 
    repo: &RepoName,
1533 
    target: &str,
1534 
    source: &str,
1535 
) -> Result<(Vec<ChangeView>, Vec<oxy_core::repo::FileDiff>), crate::repos::RepoError> {
1536 
    let Some((fork, bookmark)) = parse_source(app, repo, source) else { return Ok((vec![], vec![])) };
1537 
    let target = target.to_string();
1538 
    let fork_dir = fork.as_ref().map(|f| app.repos.dir(f));
1539 
    app.repos
1540 
        .read(repo, move |r, cache| {
1541 
            let projection = match &fork_dir {
1542 
                Some(dir) => {
1543 
                    let fork_repo = oxy_core::repo::Repo::open(dir)?;
1544 
                    let heads = fork_repo.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
1545 
                    pl::project(r, cache, &target, Source::Fork { fork: &fork_repo, heads })?
1546 
                }
1547 
                None => {
1548 
                    let heads = r.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
1549 
                    pl::project(r, cache, &target, Source::Bookmark(heads))?
1550 
                }
1551 
            };
1552 
            Ok((projection.changes, projection.files))
1553 
        })
1554 
        .await
1555 
}
1556
1557 
/// `POST /{owner}/{name}/proposals/new/draft`: an assistant drafts the
1558 
/// description from the changes the proposal would add; the form comes
1559 
/// back with the draft to edit (hub spec §13.4).
1560 
pub async fn new_draft(
1561 
    State(app): State<Shared>,
1562 
    viewer: Viewer,
1563 
    Path((owner, name)): Path<(String, String)>,
1564 
    Form(f): Form<NewForm>,
1565 
) -> Result<Page<NewProposalPage>, Error> {
1566 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposals/new"), &viewer);
1567 
    let me = require(&viewer, &shell)?;
1568 
    csrf(&viewer, &f.csrf_token, &shell)?;
1569 
    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1570 
    let bookmarks =
1571 
        app.repos.read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>())).await.unwrap_or_default();
1572 
    let (preview, conflicted) = preview_for(&app, &repo, &f.target, &f.source).await.unwrap_or((vec![], false));
1573 
    let assistants = if preview.is_empty() { vec![] } else { assistant_names(&app, &row).await };
1574 
    let mut page = NewProposalPage {
1575 
        shell,
1576 
        repo: RepoShell::new(&app, &row, "proposals").with_role(role),
1577 
        bookmarks,
1578 
        source: f.source.clone(),
1579 
        target: f.target.clone(),
1580 
        error: None,
1581 
        preview,
1582 
        conflicted,
1583 
        title: f.title.clone(),
1584 
        body: f.body.clone(),
1585 
        assistants,
1586 
    };
1587 
    let assistant = crate::assistants::enabled_for_repo(&app.db, &row)
1588 
        .await
1589 
        .unwrap_or_default()
1590 
        .into_iter()
1591 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()));
1592 
    let Some(a) = assistant else {
1593 
        page.error = Some(format!("No assistant called {} here.", f.assistant.trim()));
1594 
        return Ok(Page(page));
1595 
    };
1596 
    if page.preview.is_empty() {
1597 
        page.error = Some("Nothing to describe: the source adds nothing to the target.".into());
1598 
        return Ok(Page(page));
1599 
    }
1600 
    let (changes, diffs) = match preview_diff(&app, &repo, &f.target, &f.source).await {
1601 
        Ok(x) => x,
1602 
        Err(e) => {
1603 
            page.error = Some(e.to_string());
1604 
            return Ok(Page(page));
1605 
        }
1606 
    };
1607 
    let d = crate::assistants::Draft { slot: -row.id, title: &f.title, target: &f.target, changes: &changes, diffs: &diffs };
1608 
    match crate::assistants::draft_description(&app, &row, &me.account, &a, d).await {
1609 
        Ok(text) => page.body = text,
1610 
        Err(why) => page.error = Some(format!("{} did not answer: {why}.", a.name)),
1611 
    }
1612 
    Ok(Page(page))
1613 
}
1614
1615 
#[derive(Deserialize)]
1616 
pub struct DraftForm {
1617 
    #[serde(rename = "_csrf")]
1618 
    csrf_token: String,
1619 
    assistant: String,
1620 
    #[serde(default)]
1621 
    title: String,
1622 
}
1623
1624 
/// `POST /{owner}/{name}/proposal/{number}/draft`: an assistant drafts the
1625 
/// description of an open proposal from its changes; the editor opens
1626 
/// with the draft, nothing is saved (hub spec §13.4).
1627 
pub async fn draft(
1628 
    State(app): State<Shared>,
1629 
    viewer: Viewer,
1630 
    Path((owner, name, number)): Path<(String, String, i64)>,
1631 
    Form(f): Form<DraftForm>,
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 (repo, 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::Maintain {
1642 
        return Err(Error::not_found(shell));
1643 
    }
1644 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
1645 
        .await
1646 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1647 
        .into_iter()
1648 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
1649 
    else {
1650 
        return Ok(back(&owner, &name, number, "conversation", None, Some(format!("No assistant called {} here.", f.assistant.trim()))));
1651 
    };
1652 
    let loaded = crate::web::proposals::load(&app, &repo, p.clone()).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
1653 
    let title = if f.title.trim().is_empty() { p.title.clone() } else { f.title.clone() };
1654 
    let d = crate::assistants::Draft { slot: p.id, title: &title, target: &p.target, changes: &loaded.changes, diffs: &loaded.diffs };
1655 
    let draft = crate::assistants::draft_description(&app, &row, &me.account, &a, d).await;
1656 
    match draft {
1657 
        Ok(text) => {
1658 
            let mut page = detail(&app, shell, &viewer, &owner, &name, number, "conversation".into(), None, None).await?;
1659 
            page.0.draft = Some(text);
1660 
            Ok(page.into_response())
1661 
        }
1662 
        Err(why) => Ok(back(&owner, &name, number, "conversation", None, Some(format!("{} did not answer: {why}.", a.name)))),
1663 
    }
1664 
}