OXYGENHUB
# 71e65fcf95ab oxygenhub / crates / hub / src / web / proposals.rs
70.2 KiB · Rust · last changed Proposals: mark landed when their work reaches the target by push 24 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)]
148 
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 {
165 
            return Some((None, bookmark.to_string()));
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        }
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        if !app.repos.exists(&fork) {
168 
            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> {
181 
    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)]
237 
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.
248 
    #[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.
253 
#[allow(clippy::too_many_arguments)]
254 
pub async fn open_proposal(
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    app: &Shared,
256 
    repo: &RepoName,
257 
    row: &db::repos::RepoRow,
258 
    me: &accounts::Account,
259 
    title: &str,
260 
    body: &str,
261 
    target: &str,
262 
    source: &str,
263 
    draft: bool,
264 
) -> Result<pdb::ProposalRow, String> {
265 
    if title.trim().is_empty() {
266 
        return Err("Give the proposal a title.".into());
267 
    }
268 
    let bookmarks =
269 
        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,
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,
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 
    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,
355 
                repo: RepoShell::new(&app, &row, "proposals").with_role(role),
356 
                bookmarks,
357 
                source: f.source.clone(),
358 
                target: f.target.clone(),
359 
                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 
    let fork_dir = match (row.source_kind.as_str(), row.source_repo_id) {
423 
        ("fork", Some(id)) => {
424 
            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))
425 
        }
426 
        _ => None,
427 
    };
428 
    let r2 = row.clone();
429 
    let loaded = app
430 
        .repos
431 
        .read(repo, move |r, cache| {
432 
            let source = match (r2.source_kind.as_str(), &fork_dir) {
433 
                ("changes", _) => Source::Changes(r2.source_changes().iter().filter_map(|h| ChangeHash::from_hex(h)).collect()),
434 
                ("fork", Some(dir)) => {
435 
                    let fork_repo = oxy_core::repo::Repo::open(dir)?;
436 
                    let heads =
437 
                        fork_repo.bookmarks()?.into_iter().find(|b| b.name == r2.source_bookmark).map(|b| b.heads).unwrap_or_default();
438 
                    // Bring the fork's changes over now, so the projection below can read them.
439 
                    let fork_state = fork_repo.load_state(&heads)?;
440 
                    let missing: Vec<ChangeHash> = fork_state.changes().map(|(h, _)| *h).filter(|h| !r.store().has(h)).collect();
441 
                    if !missing.is_empty() {
442 
                        r.import_bundle(&fork_repo.bundle_for(&missing)?, r.current_policy()?.is_some())?;
443 
                    }
444 
                    Source::Changes(heads)
445 
                }
446 
                _ => {
447 
                    let heads = r.bookmarks()?.into_iter().find(|b| b.name == r2.source_bookmark).map(|b| b.heads).unwrap_or_default();
448 
                    Source::Bookmark(heads)
449 
                }
450 
            };
451 
            let source_has_changes = match &source {
452 
                Source::Changes(h) | Source::Bookmark(h) | Source::Fork { heads: h, .. } => !h.is_empty(),
453 
            };
454 
            let p: Projection = pl::project(r, cache, &r2.target, source)?;
455 
            let target_loaded = cache.load(r, &p.target_heads)?;
456 
            let files = render_files(&p.files, &p.bases);
457 
            let mut atoms = HashMap::new();
458 
            for f in &files {
459 
                for l in &f.lines {
460 
                    if let Some(n) = l.new_no {
461 
                        if let Some((h, i)) = pl::atom_at(&p.loaded, &f.path, n as usize) {
462 
                            atoms.insert((f.path.clone(), n as usize), (h.to_hex(), i));
463 
                        }
464 
                    }
465 
                }
466 
            }
467 
            let touched: Vec<String> = p.files.iter().map(|f| f.path.clone()).collect();
468 
            let owners = pl::owners_for(&target_loaded, &touched);
469 
            let sealing = pl::sealing_keys(r, &p.hashes)?.into_iter().map(|k| k.to_hex()).collect();
470 
            let landed_already = !p.hashes.is_empty() && p.hashes.iter().all(|h| target_loaded.state.contains(h));
471 
            // A landed proposal's changes are in its target now: it shows
472 
            // the ones it landed, as recorded when it landed.
473 
            let (changes, hashes) = if r2.state == "landed" && p.hashes.is_empty() {
474 
                let hashes: Vec<ChangeHash> = r2.projected_changes().iter().filter_map(|h| ChangeHash::from_hex(h)).collect();
475 
                let labels = HashMap::new();
476 
                let changes = hashes
477 
                    .iter()
478 
                    .filter_map(|h| Some(view::change_view_pub(r, h, &r.store().get_change_meta(h).ok()?, false, &labels)))
479 
                    .collect();
480 
                (changes, hashes)
481 
            } else {
482 
                (p.changes, p.hashes)
483 
            };
484 
            Ok(Loaded {
485 
                row: r2,
486 
                changes,
487 
                hashes,
488 
                heads: p.heads,
489 
                target_heads: p.target_heads.clone(),
490 
                state: p.state.to_hex(),
491 
                target_state: p.target_state.to_hex(),
492 
                conflicted: p.conflicted,
493 
                conflicts: p.conflicts,
494 
                files,
495 
                diffs: p.files.clone(),
496 
                bases: p.bases.clone(),
497 
                atoms,
498 
                sealing_keys: sealing,
499 
                touched,
500 
                owners,
501 
                landed_already,
502 
                source_has_changes,
503 
            })
504 
        })
505 
        .await?;
506 
    // Landed by another route (#141): `oxy proposal land` from a client (a
507 
    // repository with a trust policy needs it), or the work merged and
508 
    // pushed by hand. Everything it proposes is in its target, so it is
509 
    // landed, not open with nothing to land.
510 
    let mut loaded = loaded;
511 
    if loaded.row.is_open()
512 
        && loaded.source_has_changes
513 
        && loaded.hashes.is_empty()
514 
        && pdb::set_landed(&app.db, loaded.row.id, &loaded.target_state, "", "push").await.is_ok()
515 
    {
516 
        loaded.row.state = "landed".into();
517 
        loaded.row.landed_via = "push".into();
518 
        loaded.row.landed_state = loaded.target_state.clone();
519 
        return Ok(loaded);
520 
    }
521 
    // Remember the projection for the list, the API and other proposals'
522 
    // stacking checks, while the proposal is open: a landed one keeps what
523 
    // it landed.
524 
    if !loaded.row.is_open() {
525 
        return Ok(loaded);
526 
    }
527 
    let heads_csv = loaded.heads.iter().map(|h| h.to_hex()).collect::<Vec<_>>().join(",");
528 
    let changes_csv = loaded.hashes.iter().map(|h| h.to_hex()).collect::<Vec<_>>().join(",");
529 
    pdb::set_projection(&app.db, loaded.row.id, &loaded.state, &heads_csv, &loaded.target_state, &changes_csv, loaded.conflicted)
530 
        .await
531 
        .ok();
532 
    Ok(loaded)
533 
}
534
535 
/// After a push moved `bookmark`: open proposals into it whose work it now
536 
/// holds are marked landed, by the pusher (#141).
537 
pub async fn settle_after_push(app: &Shared, row: &db::repos::RepoRow, bookmark: &str, actor: &str) {
538 
    let Some(repo) = RepoName::new(&row.owner, &row.name) else { return };
539 
    let Ok(open) = pdb::list(&app.db, row.id, &["open", "draft"]).await else { return };
540 
    for p in open.into_iter().filter(|p| p.target == bookmark) {
541 
        let id = p.id;
542 
        if let Ok(l) = load(app, &repo, p).await {
543 
            if l.row.state == "landed" && l.row.landed_by.is_empty() {
544 
                pdb::set_landed(&app.db, id, &l.target_state, actor, "push").await.ok();
545 
            }
546 
        }
547 
    }
548 
}
549
550 
/// Reviews, approvals and blockers.
551 
pub struct Verdict {
552 
    pub reviews: Vec<ReviewView>,
553 
    pub approvals: Vec<Approval>,
554 
    pub blockers: Vec<String>,
555 
    pub depends_on: Vec<i64>,
556 
    pub requirements: pdb::Requirements,
557 
}
558
559 
pub async fn verdict(app: &Shared, loaded: &Loaded, repo_id: i64) -> Result<Verdict, sqlx::Error> {
560 
    let rows = pdb::reviews(&app.db, loaded.row.id).await?;
561 
    let links = accounts::identity_accounts(&app.db).await?;
562 
    let sealed_accounts: Vec<String> = links.iter().filter(|(k, _)| loaded.sealing_keys.contains(k)).map(|(_, u)| u.clone()).collect();
563 
    // Latest verdict per reviewer.
564 
    let mut latest: BTreeMap<String, &pdb::ReviewRow> = BTreeMap::new();
565 
    for r in rows.iter().filter(|r| r.via.is_empty()) {
566 
        // An assistant's answer is never the person's own verdict.
567 
        latest.insert(r.author.clone(), r);
568 
    }
569 
    let mut approvals = Vec::new();
570 
    for (who, r) in &latest {
571 
        if r.verdict == "approve" {
572 
            let sealed = sealed_accounts.contains(who);
573 
            let key = links.iter().find(|(k, u)| u == who && loaded.sealing_keys.contains(k)).map(|(k, _)| k.clone());
574 
            approvals.push(Approval { account: who.clone(), sealed, key });
575 
        }
576 
    }
577 
    let reviews = rows
578 
        .iter()
579 
        .map(|r| ReviewView {
580 
            row: r.clone(),
581 
            body_html: render::markdown::render(&r.body, "/", "/"),
582 
            sealed: r.verdict == "approve" && sealed_accounts.contains(&r.author),
583 
        })
584 
        .collect();
585 
    let requirements = pdb::requirements(&app.db, repo_id).await?;
586 
    let mut blockers = Vec::new();
587 
    // Only an open proposal can be held back.
588 
    if !loaded.row.is_open() {
589 
        return Ok(Verdict { reviews, approvals, blockers, depends_on: vec![], requirements });
590 
    }
591 
    if loaded.row.state == "draft" {
592 
        blockers.push("the proposal is a draft".into());
593 
    }
594 
    if loaded.hashes.is_empty() {
595 
        blockers.push("the proposal adds no changes".into());
596 
    }
597 
    let sealed_count = approvals.iter().filter(|a| a.sealed).count() as i64;
598 
    if sealed_count < requirements.required_approvals {
599 
        blockers.push(format!("{sealed_count} of {} required sealed approvals", requirements.required_approvals));
600 
    }
601 
    if requirements.require_owners {
602 
        let missing: Vec<&String> = loaded.owners.iter().filter(|o| !approvals.iter().any(|a| a.sealed && &a.account == *o)).collect();
603 
        if !missing.is_empty() {
604 
            blockers.push(format!("code owners still to approve: {}", missing.iter().map(|s| s.as_str()).collect::<Vec<_>>().join(", ")));
605 
        }
606 
    }
607 
    if loaded.conflicted && !requirements.allow_conflicts {
608 
        blockers.push("landing would carry conflicts, which this repository refuses".into());
609 
    }
610 
    let required = db::hooks::required_checks(&app.db, repo_id).await?;
611 
    if !required.is_empty() {
612 
        let checks = db::hooks::checks_for_state(&app.db, repo_id, &loaded.state).await?;
613 
        let missing: Vec<String> =
614 
            required.iter().filter(|n| !checks.iter().any(|c| &c.name == *n && c.status == "passed")).cloned().collect();
615 
        if !missing.is_empty() {
616 
            blockers.push(format!("required checks not passed on the projected state: {}", missing.join(", ")));
617 
        }
618 
    }
619 
    let requesting: Vec<&String> = latest.iter().filter(|(_, r)| r.verdict == "changes").map(|(who, _)| who).collect();
620 
    if !requesting.is_empty() {
621 
        blockers.push(format!("changes requested by {}", requesting.iter().map(|s| s.as_str()).collect::<Vec<_>>().join(", ")));
622 
    }
623 
    // Stacking: another open, earlier proposal whose changes this one includes.
624 
    let mut depends_on = Vec::new();
625 
    for other in pdb::list(&app.db, repo_id, &["open", "draft"]).await? {
626 
        if other.id == loaded.row.id || other.number > loaded.row.number {
627 
            continue;
628 
        }
629 
        let theirs = other.projected_changes();
630 
        if !theirs.is_empty() && theirs.iter().all(|h| loaded.hashes.iter().any(|m| m.to_hex() == *h)) {
631 
            depends_on.push(other.number);
632 
        }
633 
    }
634 
    if !depends_on.is_empty() {
635 
        blockers.push(format!("depends on {}", depends_on.iter().map(|n| format!("#{n}")).collect::<Vec<_>>().join(", ")));
636 
    }
637 
    Ok(Verdict { reviews, approvals, blockers, depends_on, requirements })
638 
}
639
640 
#[derive(Template)]
641 
#[template(path = "proposal.html")]
642 
pub struct ProposalPage {
643 
    shell: Shell,
644 
    repo: RepoShell,
645 
    p: pdb::ProposalRow,
646 
    /// Issues it closes, from its description and its changes.
647 
    closes: Vec<super::chain::Link>,
648 
    /// Projects the viewer may add it to.
649 
    project_choices: Option<Vec<db::projects::Project>>,
650 
    /// Comments (not anchored to a line), reviews and events, oldest first.
651 
    timeline: Vec<Entry>,
652 
    /// The viewer may set labels (triage or above).
653 
    can_triage: bool,
654 
    body_html: String,
655 
    tab: String,
656 
    changes: Vec<ChangeView>,
657 
    files: Vec<FileRows>,
658 
    diffs: Vec<oxy_core::repo::FileDiff>,
659 
    bases: std::collections::BTreeMap<String, Vec<u8>>,
660 
    /// Whitespace-only changes are hidden (`?w=1`).
661 
    ignore_ws: bool,
662 
    conflicts: Vec<ConflictView>,
663 
    conflicted: bool,
664 
    comments: Vec<CommentView>,
665 
    /// Anchored comments by (path, current line).
666 
    placed: HashMap<(String, usize), Vec<usize>>,
667 
    outdated: Vec<usize>,
668 
    reviews: Vec<ReviewView>,
669 
    approvals: Vec<Approval>,
670 
    blockers: Vec<String>,
671 
    depends_on: Vec<i64>,
672 
    events: Vec<pdb::EventRow>,
673 
    owners: Vec<String>,
674 
    requirements: pdb::Requirements,
675 
    landed_already: bool,
676 
    can_edit: bool,
677 
    /// The landed proposal's source bookmark, when it is this repository's,
678 
    /// still there, and the viewer may delete it (oxygenhub#86).
679 
    deletable_source: Option<String>,
680 
    can_land: bool,
681 
    hub_can_land: bool,
682 
    notice: Option<String>,
683 
    error: Option<String>,
684 
    heads: Vec<String>,
685 
    state_hash: String,
686 
    source_label: String,
687 
    api_url: String,
688 
    labels: Vec<db::issues::Label>,
689 
    all_labels: Vec<db::issues::Label>,
690 
    checks: Vec<db::hooks::Check>,
691 
    required_checks: Vec<String>,
692 
    /// Projects this proposal is on that the viewer may see, with the column.
693 
    projects: Vec<(db::projects::Project, String)>,
694 
    /// Asked to review and not yet reviewing.
695 
    requested: Vec<String>,
696 
    /// Who can be asked to review, for the sidebar's menu (oxygenhub#84).
697 
    reviewable: Vec<String>,
698 
    /// The viewer may ask for reviews (the author, or a writer).
699 
    can_request: bool,
700 
    /// AI assistants the viewer may ask, by name (hub spec §13.4).
701 
    assistants: Vec<String>,
702 
    /// A description an assistant just drafted, for the editor.
703 
    draft: Option<String>,
704 
}
705
706 
#[derive(Deserialize)]
707 
pub struct DetailQuery {
708 
    tab: Option<String>,
709 
    /// What an action said, after it redirected here.
710 
    #[serde(default)]
711 
    notice: Option<String>,
712 
    #[serde(default)]
713 
    error: Option<String>,
714 
    #[serde(default)]
715 
    w: Option<String>,
716 
}
717
718 
/// The page assembler every action ends in; its arguments are the route
719 
/// plus what to say, and a struct would only rename them.
720 
#[allow(clippy::too_many_arguments)]
721 
async fn detail(
722 
    app: &Shared,
723 
    shell: Shell,
724 
    viewer: &Viewer,
725 
    owner: &str,
726 
    name: &str,
727 
    number: i64,
728 
    tab: String,
729 
    notice: Option<String>,
730 
    error: Option<String>,
731 
) -> Result<Page<ProposalPage>, Error> {
732 
    let (repo, row, role) = lookup(app, &shell, viewer, owner, name).await?;
733 
    let p = pdb::get(&app.db, row.id, number)
734 
        .await
735 
        .map_err(|e| Error::from_db(shell.clone(), e))?
736 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
737 
    let loaded = load(app, &repo, p).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
738 
    // A proposal whose changes all reached the target landed by another route.
739 
    if loaded.landed_already && loaded.row.is_open() {
740 
        pdb::set_state(&app.db, loaded.row.id, "landed", &loaded.target_state).await.ok();
741 
        pdb::add_event(&app.db, loaded.row.id, "", "landed", "every change reached the target").await.ok();
742 
    }
743 
    let p = pdb::get(&app.db, row.id, number).await.map_err(|e| Error::from_db(shell.clone(), e))?.unwrap_or(loaded.row.clone());
744 
    let v = verdict(app, &loaded, row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
745 
    let comment_rows = pdb::comments(&app.db, loaded.row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
746 
    let events = pdb::events(&app.db, loaded.row.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
747 
    // Place anchored comments at their atom's current line.
748 
    let mut by_atom: HashMap<(String, String, u32), usize> = HashMap::new();
749 
    for ((path, line), (h, i)) in &loaded.atoms {
750 
        by_atom.insert((path.clone(), h.clone(), *i), *line);
751 
    }
752 
    let mut comments = Vec::new();
753 
    let mut placed: HashMap<(String, usize), Vec<usize>> = HashMap::new();
754 
    let mut outdated = Vec::new();
755 
    for (idx, c) in comment_rows.into_iter().enumerate() {
756 
        let line = if c.anchor_change.is_empty() {
757 
            None
758 
        } else {
759 
            by_atom.get(&(c.path.clone(), c.anchor_change.clone(), c.anchor_index as u32)).copied()
760 
        };
761 
        if !c.anchor_change.is_empty() {
762 
            match line {
763 
                Some(l) => placed.entry((c.path.clone(), l)).or_default().push(idx),
764 
                None => outdated.push(idx),
765 
            }
766 
        }
767 
        comments.push(CommentView { body_html: render::markdown::render(&c.body, "/", "/"), row: c, line });
768 
    }
769 
    let mut changes = loaded.changes.clone();
770 
    super::attribute(app, &mut changes.iter_mut().collect::<Vec<_>>()).await;
771 
    let me = viewer.account();
772 
    let can_edit = me.is_some_and(|a| Some(a.id) == p.author_id || role >= Role::Maintain);
773 
    let deletable_source =
774 
        if p.state == "landed" && p.source_kind == "bookmark" && role >= Role::Write && p.source_bookmark != row.default_bookmark {
775 
            let b = p.source_bookmark.clone();
776 
            app.repos
777 
                .read(&repo, move |r, _| Ok(r.view()?.bookmarks.contains_key(&b)))
778 
                .await
779 
                .unwrap_or(false)
780 
                .then(|| p.source_bookmark.clone())
781 
        } else {
782 
            None
783 
        };
784 
    let can_land = role >= Role::Write && p.is_open() && v.blockers.is_empty();
785 
    let can_request = p.is_open() && me.is_some_and(|a| Some(a.id) == p.author_id || role >= Role::Write);
786 
    let requested = pdb::review_requests(&app.db, p.id).await.unwrap_or_default();
787 
    let mut reviewable: Vec<String> = if can_request {
788 
        accounts::assignable(&app.db, row.id, &row.owner).await.unwrap_or_default().into_iter().filter(|u| *u != p.author).collect()
789 
    } else {
790 
        Vec::new()
791 
    };
792 
    for r in &requested {
793 
        if !reviewable.iter().any(|x| x.eq_ignore_ascii_case(r)) {
794 
            reviewable.push(r.clone());
795 
        }
796 
    }
797 
    let assistants: Vec<String> = if (can_request || can_edit) && p.is_open() { assistant_names(app, &row).await } else { Vec::new() };
798 
    let delegated = match viewer.account() {
799 
        Some(a) => super::edit::delegated_identity(app, a.id).await.is_some(),
800 
        None => false,
801 
    };
802 
    let hub_can_land = delegated || app.repos.read(&repo, |r, _| Ok(r.current_policy()?.is_none())).await.unwrap_or(false);
803 
    let source_label = match p.source_kind.as_str() {
804 
        "fork" => format!(
805 
            "fork {}",
806 
            db::repos::get_by_id(&app.db, p.source_repo_id.unwrap_or(0))
807 
                .await
808 
                .ok()
809 
                .flatten()
810 
                .map(|r| format!("{}:{}", r.slug(), p.source_bookmark))
811 
                .unwrap_or_default()
812 
        ),
813 
        "changes" => format!("{} changes", p.source_changes().len()),
814 
        _ => p.source_bookmark.clone(),
815 
    };
816 
    let projects = super::projects::placements_for(app, viewer, &row, p.number).await;
817 
    let texts: Vec<String> = std::iter::once(p.body.clone()).chain(changes.iter().map(|c| format!("{}\n{}", c.title, c.body))).collect();
818 
    let closes = super::chain::issues_closed_by(app, &row, &texts.iter().map(String::as_str).collect::<Vec<_>>()).await;
819 
    let project_choices = super::projects::project_choices(app, viewer, &row, &projects).await;
820 
    let mut dated: Vec<(i64, Entry)> = Vec::new();
821 
    for (index, c) in comments.iter().enumerate() {
822 
        if c.row.anchor_change.is_empty() {
823 
            dated.push((c.row.created_ms, Entry { kind: "comment", index }));
824 
        }
825 
    }
826 
    for (index, r) in v.reviews.iter().enumerate() {
827 
        dated.push((r.row.created_ms, Entry { kind: "review", index }));
828 
    }
829 
    for (index, e) in events.iter().enumerate() {
830 
        dated.push((e.at_ms, Entry { kind: "event", index }));
831 
    }
832 
    dated.sort_by_key(|(at, _)| *at);
833 
    let timeline: Vec<Entry> = dated.into_iter().map(|(_, e)| e).collect();
834 
    Ok(Page(ProposalPage {
835 
        can_triage: role >= Role::Triage,
836 
        timeline,
837 
        closes,
838 
        project_choices,
839 
        projects,
840 
        shell,
841 
        repo: RepoShell::new(app, &row, "proposals").with_role(role),
842 
        body_html: super::issues::markdown(app, &row, &row.default_bookmark, &p.body).await,
843 
        p,
844 
        tab,
845 
        changes,
846 
        files: loaded.files,
847 
        diffs: loaded.diffs,
848 
        bases: loaded.bases,
849 
        ignore_ws: false,
850 
        conflicts: loaded.conflicts,
851 
        conflicted: loaded.conflicted,
852 
        comments,
853 
        placed,
854 
        outdated,
855 
        reviews: v.reviews,
856 
        approvals: v.approvals,
857 
        blockers: v.blockers,
858 
        depends_on: v.depends_on,
859 
        events,
860 
        owners: loaded.owners,
861 
        requirements: v.requirements,
862 
        landed_already: loaded.landed_already,
863 
        can_edit,
864 
        deletable_source,
865 
        can_land,
866 
        hub_can_land,
867 
        notice,
868 
        error,
869 
        heads: loaded.heads.iter().map(|h| h.to_hex()).collect(),
870 
        state_hash: loaded.state.clone(),
871 
        source_label,
872 
        api_url: format!("{}/api/v1/repos/{owner}/{name}/proposals/{number}", app.config.base_url()),
873 
        labels: db::issues::proposal_labels(&app.db, loaded.row.id).await.unwrap_or_default(),
874 
        all_labels: db::issues::labels(&app.db, row.id).await.unwrap_or_default(),
875 
        checks: db::hooks::checks_for_state(&app.db, row.id, &loaded.state).await.unwrap_or_default(),
876 
        required_checks: db::hooks::required_checks(&app.db, row.id).await.unwrap_or_default(),
877 
        requested,
878 
        reviewable,
879 
        assistants,
880 
        draft: None,
881 
        can_request,
882 
    }))
883 
}
884
885 
/// Back to the proposal after an action, with what to say: a redirect, so
886 
/// reloading the page (the checks script does) never repeats the action.
887 
fn back(owner: &str, name: &str, number: i64, tab: &str, notice: Option<String>, error: Option<String>) -> Response {
888 
    let mut url = format!("/{owner}/{name}/proposal/{number}?tab={tab}");
889 
    if let Some(n) = notice {
890 
        url.push_str(&format!("&notice={}", super::settings::urlencode(&n)));
891 
    }
892 
    if let Some(e) = error {
893 
        url.push_str(&format!("&error={}", super::settings::urlencode(&e)));
894 
    }
895 
    Redirect::to(&url).into_response()
896 
}
897
898 
pub async fn show(
899 
    State(app): State<Shared>,
900 
    viewer: Viewer,
901 
    Path((owner, name, number)): Path<(String, String, i64)>,
902 
    Query(q): Query<DetailQuery>,
903 
) -> Result<Page<ProposalPage>, Error> {
904 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
905 
    let mut page =
906 
        detail(&app, shell, &viewer, &owner, &name, number, q.tab.unwrap_or_else(|| "conversation".into()), q.notice, q.error).await?;
907 
    if q.w.as_deref() == Some("1") {
908 
        // Hide whitespace-only changes: the same hunks, rendered again.
909 
        page.0.files =
910 
            super::history::render_files_with(&page.0.diffs, &page.0.bases, crate::render::diff::Options { ignore_whitespace: true });
911 
        page.0.ignore_ws = true;
912 
    }
913 
    Ok(page)
914 
}
915
916 
// ---------------------------------------------------------------- actions
917
918 
#[derive(Deserialize)]
919 
pub struct CommentForm {
920 
    #[serde(rename = "_csrf")]
921 
    csrf_token: String,
922 
    body: String,
923 
    #[serde(default)]
924 
    path: String,
925 
    #[serde(default)]
926 
    line: Option<usize>,
927 
}
928
929 
pub async fn comment(
930 
    State(app): State<Shared>,
931 
    viewer: Viewer,
932 
    Path((owner, name, number)): Path<(String, String, i64)>,
933 
    Form(f): Form<CommentForm>,
934 
) -> Result<Response, Error> {
935 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
936 
    let me = require(&viewer, &shell)?;
937 
    csrf(&viewer, &f.csrf_token, &shell)?;
938 
    let (repo, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
939 
    super::writable(&row, &shell)?;
940 
    let p = pdb::get(&app.db, row.id, number)
941 
        .await
942 
        .map_err(|e| Error::from_db(shell.clone(), e))?
943 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
944 
    if f.body.trim().is_empty() {
945 
        return Ok(back(&owner, &name, number, "conversation", None, Some("An empty comment says nothing.".into())));
946 
    }
947 
    let anchor = match (f.path.trim(), f.line) {
948 
        ("", _) | (_, None) => None,
949 
        (path, Some(line)) => {
950 
            let loaded = load(&app, &repo, p.clone()).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
951 
            loaded.atoms.get(&(path.to_string(), line)).cloned()
952 
        }
953 
    };
954 
    let tab = if anchor.is_some() { "files" } else { "conversation" };
955 
    pdb::add_comment(
956 
        &app.db,
957 
        p.id,
958 
        Some(me.account.id),
959 
        &me.account.username,
960 
        f.body.trim(),
961 
        f.path.trim(),
962 
        anchor.as_ref().map(|(h, i)| (h.as_str(), *i as i64)),
963 
    )
964 
    .await
965 
    .map_err(|e| Error::from_db(shell.clone(), e))?;
966 
    Ok(back(&owner, &name, number, tab, None, None))
967 
}
968
969 
#[derive(Deserialize)]
970 
pub struct ReviewForm {
971 
    #[serde(rename = "_csrf")]
972 
    csrf_token: String,
973 
    verdict: String,
974 
    #[serde(default)]
975 
    body: String,
976 
}
977
978 
pub async fn review(
979 
    State(app): State<Shared>,
980 
    viewer: Viewer,
981 
    Path((owner, name, number)): Path<(String, String, i64)>,
982 
    Form(f): Form<ReviewForm>,
983 
) -> Result<Response, Error> {
984 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
985 
    let me = require(&viewer, &shell)?;
986 
    csrf(&viewer, &f.csrf_token, &shell)?;
987 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
988 
    super::writable(&row, &shell)?;
989 
    let p = pdb::get(&app.db, row.id, number)
990 
        .await
991 
        .map_err(|e| Error::from_db(shell.clone(), e))?
992 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
993 
    if !matches!(f.verdict.as_str(), "comment" | "changes" | "approve") {
994 
        return Err(Error::bad(shell, "a review is comment, changes or approve"));
995 
    }
996 
    if f.verdict == "approve" && Some(me.account.id) == p.author_id {
997 
        return Ok(back(&owner, &name, number, "conversation", None, Some("You cannot approve your own proposal.".into())));
998 
    }
999 
    pdb::add_review(&app.db, p.id, me.account.id, &me.account.username, &f.verdict, f.body.trim())
1000 
        .await
1001 
        .map_err(|e| Error::from_db(shell.clone(), e))?;
1002 
    pdb::add_event(&app.db, p.id, &me.account.username, &format!("review.{}", f.verdict), "").await.ok();
1003 
    reviewed(&app, &row, &p, &me.account, &f.verdict).await;
1004 
    crate::hooks::emit(&app, &row, "review", &me.account.username, serde_json::json!({ "number": number, "verdict": f.verdict })).await;
1005 
    let notice = if f.verdict == "approve" {
1006 
        Some(format!(
1007 
            "Approval recorded. It counts once you seal the changes: oxy seal --proposal {}/{owner}/{name}/proposal/{number}",
1008 
            app.config.base_url()
1009 
        ))
1010 
    } else {
1011 
        None
1012 
    };
1013 
    Ok(back(&owner, &name, number, "conversation", notice, None))
1014 
}
1015
1016 
#[derive(Deserialize)]
1017 
pub struct EditForm {
1018 
    #[serde(rename = "_csrf")]
1019 
    csrf_token: String,
1020 
    title: String,
1021 
    #[serde(default)]
1022 
    body: String,
1023 
    target: String,
1024 
}
1025
1026 
pub async fn edit(
1027 
    State(app): State<Shared>,
1028 
    viewer: Viewer,
1029 
    Path((owner, name, number)): Path<(String, String, i64)>,
1030 
    Form(f): Form<EditForm>,
1031 
) -> Result<Response, Error> {
1032 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1033 
    let me = require(&viewer, &shell)?;
1034 
    csrf(&viewer, &f.csrf_token, &shell)?;
1035 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1036 
    let p = pdb::get(&app.db, row.id, number)
1037 
        .await
1038 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1039 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1040 
    if Some(me.account.id) != p.author_id && role < Role::Maintain {
1041 
        return Err(Error::not_found(shell));
1042 
    }
1043 
    let target = if crate::repos::names::valid_segment(f.target.trim()) { f.target.trim() } else { &p.target };
1044 
    pdb::edit(&app.db, p.id, f.title.trim(), f.body.trim(), target).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1045 
    pdb::add_event(&app.db, p.id, &me.account.username, "edited", "").await.ok();
1046 
    Ok(back(&owner, &name, number, "conversation", Some("Saved.".into()), None))
1047 
}
1048
1049 
#[derive(Deserialize)]
1050 
pub struct StateForm {
1051 
    #[serde(rename = "_csrf")]
1052 
    csrf_token: String,
1053 
    action: String,
1054 
}
1055
1056 
pub async fn state(
1057 
    State(app): State<Shared>,
1058 
    viewer: Viewer,
1059 
    Path((owner, name, number)): Path<(String, String, i64)>,
1060 
    Form(f): Form<StateForm>,
1061 
) -> Result<Response, Error> {
1062 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1063 
    let me = require(&viewer, &shell)?;
1064 
    csrf(&viewer, &f.csrf_token, &shell)?;
1065 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1066 
    let p = pdb::get(&app.db, row.id, number)
1067 
        .await
1068 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1069 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1070 
    if Some(me.account.id) != p.author_id && role < Role::Triage {
1071 
        return Err(Error::not_found(shell));
1072 
    }
1073 
    let new_state = match (f.action.as_str(), p.state.as_str()) {
1074 
        ("close", "open" | "draft") => "closed",
1075 
        ("reopen", "closed") => "open",
1076 
        ("ready", "draft") => "open",
1077 
        ("draft", "open") => "draft",
1078 
        _ => return Err(Error::bad(shell, "that transition is not possible")),
1079 
    };
1080 
    pdb::set_state(&app.db, p.id, new_state, "").await.map_err(|e| Error::from_db(shell.clone(), e))?;
1081 
    pdb::add_event(&app.db, p.id, &me.account.username, new_state, "").await.ok();
1082 
    crate::hooks::emit(&app, &row, &format!("proposal.{new_state}"), &me.account.username, serde_json::json!({ "number": number })).await;
1083 
    Ok(back(&owner, &name, number, "conversation", None, None))
1084 
}
1085
1086 
pub async fn resolve_comment(
1087 
    State(app): State<Shared>,
1088 
    viewer: Viewer,
1089 
    Path((owner, name, number, id)): Path<(String, String, i64, i64)>,
1090 
    Form(f): Form<super::session::CsrfForm>,
1091 
) -> Result<Response, Error> {
1092 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1093 
    require(&viewer, &shell)?;
1094 
    csrf(&viewer, &f.csrf, &shell)?;
1095 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1096 
    let p = pdb::get(&app.db, row.id, number)
1097 
        .await
1098 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1099 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1100 
    let current: Option<bool> = sqlx::query_scalar("SELECT resolved FROM proposal_comments WHERE id = ? AND proposal_id = ?")
1101 
        .bind(id)
1102 
        .bind(p.id)
1103 
        .fetch_optional(&app.db)
1104 
        .await
1105 
        .map_err(|e| Error::from_db(shell.clone(), e))?;
1106 
    if let Some(r) = current {
1107 
        pdb::set_comment_resolved(&app.db, id, !r).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1108 
    }
1109 
    Ok(back(&owner, &name, number, "files", None, None))
1110 
}
1111
1112 
/// Land from the hub: only when the repository has no trust policy (the
1113 
/// hub never signs a reference update the policy would have to admit).
1114 
pub async fn land(
1115 
    State(app): State<Shared>,
1116 
    viewer: Viewer,
1117 
    Path((owner, name, number)): Path<(String, String, i64)>,
1118 
    Form(f): Form<super::session::CsrfForm>,
1119 
) -> Result<Response, Error> {
1120 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1121 
    let me = require(&viewer, &shell)?;
1122 
    csrf(&viewer, &f.csrf, &shell)?;
1123 
    let (repo, row, _) = lookup_role(&app, &shell, &viewer, &owner, &name, Access::Write).await?;
1124 
    match land_as(&app, &repo, &row, &me.account, number, "web").await {
1125 
        Ok(_) => Ok(back(&owner, &name, number, "conversation", Some("Landed.".into()), None)),
1126 
        Err(Landing::NotFound) => Err(Error::not_found(shell)),
1127 
        Err(Landing::Refused(m)) => Ok(back(&owner, &name, number, "conversation", None, Some(m))),
1128 
    }
1129 
}
1130
1131 
/// Why a proposal did not land.
1132 
pub enum Landing {
1133 
    NotFound,
1134 
    Refused(String),
1135 
}
1136
1137 
/// Land proposal `number` as `me` (hub spec §8.4), who has write access:
1138 
/// refused while it is not open or has blockers. Moves the target bookmark
1139 
/// (attested by the hub key on `me`'s behalf when they delegated to it),
1140 
/// then records, announces and audits the landing, saying how it was done
1141 
/// (`via`: `web`, or `api (token NAME)`). Returns the new state.
1142 
pub async fn land_as(
1143 
    app: &Shared,
1144 
    repo: &RepoName,
1145 
    row: &db::repos::RepoRow,
1146 
    me: &accounts::Account,
1147 
    number: i64,
1148 
    via: &str,
1149 
) -> Result<String, Landing> {
1150 
    let (owner, name) = (row.owner.clone(), row.name.clone());
1151 
    let refused = |e: String| Landing::Refused(e);
1152 
    let p = pdb::get(&app.db, row.id, number).await.map_err(|e| refused(e.to_string()))?.ok_or(Landing::NotFound)?;
1153 
    let loaded = load(app, repo, p.clone()).await.map_err(|e| refused(e.to_string()))?;
1154 
    let v = verdict(app, &loaded, row.id).await.map_err(|e| refused(e.to_string()))?;
1155 
    if !p.is_open() {
1156 
        return Err(refused(format!("Cannot land: the proposal is {}", p.state)));
1157 
    }
1158 
    if !v.blockers.is_empty() {
1159 
        return Err(refused(format!("Cannot land: {}", v.blockers.join("; "))));
1160 
    }
1161 
    let target = p.target.clone();
1162 
    let heads = loaded.heads.clone();
1163 
    // With a delegation the landing is attested by the hub key on the
1164 
    // user's behalf, which a policy accepts when it lets the user update
1165 
    // the target (spec §14.5); without one, only a policy-free repository
1166 
    // can be landed here.
1167 
    let result = match super::edit::signer_for(app, me.id).await {
1168 
        Ok(signer) => crate::repos::edits::move_bookmark(&app.repos, repo, target.clone(), heads.clone(), signer).await.map(|_| pl::state_ref(&heads).to_hex()),
1169 
        Err(why) => {
1170 
            app.repos
1171 
                .write(repo, move |r, _| {
1172 
                    if r.current_policy()?.is_some() {
1173 
                        return Err(crate::repos::RepoError::Oxy(oxy_core::repo::RepoError::Msg(format!(
1174 
                            "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}"
1175 
                        ))));
1176 
                    }
1177 
                    r.bookmark_set(&target, &heads)?;
1178 
                    Ok(pl::state_ref(&heads).to_hex())
1179 
                })
1180 
                .await
1181 
        }
1182 
    };
1183 
    let state = result.map_err(|e| refused(e.to_string()))?;
1184 
    pdb::set_landed(&app.db, p.id, &state, &me.username, via).await.map_err(|e| refused(e.to_string()))?;
1185 
    let how = if v.approvals.is_empty() { format!("{via}, with no approval") } else { via.to_string() };
1186 
    pdb::add_event(&app.db, p.id, &me.username, "landed", &how).await.ok();
1187 
    crate::hooks::emit(
1188 
        app,
1189 
        row,
1190 
        "proposal.landed",
1191 
        &me.username,
1192 
        serde_json::json!({ "number": number, "target": p.target, "state": state }),
1193 
    )
1194 
    .await;
1195 
    crate::notify::deliver(
1196 
        app,
1197 
        crate::notify::Event {
1198 
            kind: "proposal.landed",
1199 
            title: format!("{owner}/{name}#{number}: {} landed", p.title),
1200 
            url: format!("/{owner}/{name}/proposal/{number}"),
1201 
            actor: me,
1202 
            repo_id: row.id,
1203 
            thread: Some(("proposal", p.id)),
1204 
            mention_text: "",
1205 
            direct: p.author_id.into_iter().collect(),
1206 
        },
1207 
    )
1208 
    .await;
1209 
    if p.target == row.default_bookmark {
1210 
        let messages: Vec<(String, String)> = loaded.changes.iter().map(|c| (c.hash.clone(), format!("{}\n{}", c.title, c.body))).collect();
1211 
        super::issues::close_from_messages(app, row, &messages).await;
1212 
    }
1213 
    accounts::audit(&app.db, Some(me), "proposal.landed", &format!("{owner}/{name}#{number}"), &how).await.ok();
1214 
    db::repos::record_push(
1215 
        &app.db,
1216 
        row.id,
1217 
        Some((me.id, me.username.as_str())),
1218 
        &[db::repos::PushOutcome {
1219 
            reference: p.target.clone(),
1220 
            ok: true,
1221 
            reason: format!("landed #{number} ({how})"),
1222 
            old_state: loaded.target_state.clone(),
1223 
            new_state: state.clone(),
1224 
            heads: loaded.heads.len() as i64,
1225 
            changes: loaded.hashes.len() as i64,
1226 
        }],
1227 
    )
1228 
    .await
1229 
    .ok();
1230 
    Ok(state)
1231 
}
1232
1233 
#[derive(Deserialize)]
1234 
pub struct LabelsForm {
1235 
    #[serde(rename = "_csrf")]
1236 
    csrf_token: String,
1237 
    #[serde(default)]
1238 
    label: Vec<i64>,
1239 
}
1240
1241 
pub async fn set_labels(
1242 
    State(app): State<Shared>,
1243 
    viewer: Viewer,
1244 
    Path((owner, name, number)): Path<(String, String, i64)>,
1245 
    axum_extra::extract::Form(f): axum_extra::extract::Form<LabelsForm>,
1246 
) -> Result<Response, Error> {
1247 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1248 
    require(&viewer, &shell)?;
1249 
    csrf(&viewer, &f.csrf_token, &shell)?;
1250 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1251 
    if role < Role::Triage {
1252 
        return Err(Error::not_found(shell));
1253 
    }
1254 
    let p = pdb::get(&app.db, row.id, number)
1255 
        .await
1256 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1257 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1258 
    for l in db::issues::labels(&app.db, row.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {
1259 
        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))?;
1260 
    }
1261 
    Ok(back(&owner, &name, number, "conversation", None, None))
1262 
}
1263
1264 
/// `GET /{owner}/{name}/proposal/{number}/events`: server-sent events for
1265 
/// checks on the projected state (hub spec §13.1).
1266 
pub async fn events(
1267 
    State(app): State<Shared>,
1268 
    viewer: Viewer,
1269 
    Path((owner, name, number)): Path<(String, String, i64)>,
1270 
) -> Result<axum::response::Sse<impl futures::Stream<Item = Result<axum::response::sse::Event, std::convert::Infallible>>>, Error> {
1271 
    use futures::StreamExt;
1272 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1273 
    let (_, row, _) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1274 
    let rx = app.events.proposals.subscribe();
1275 
    let repo_id = row.id;
1276 
    let stream = tokio_stream::wrappers::BroadcastStream::new(rx).filter_map(move |item| async move {
1277 
        match item {
1278 
            Ok((id, ev)) if id == repo_id => {
1279 
                Some(Ok(axum::response::sse::Event::default().event(ev.kind.clone()).data(serde_json::to_string(&ev).unwrap_or_default())))
1280 
            }
1281 
            _ => None,
1282 
        }
1283 
    });
1284 
    Ok(axum::response::Sse::new(stream).keep_alive(axum::response::sse::KeepAlive::default()))
1285 
}
1286
1287 
// -------------------------------------------------------------------- API
1288
1289 
pub async fn to_api(app: &Shared, owner: &str, name: &str, loaded: &Loaded, v: &Verdict, source_url: Option<String>) -> hub_api::Proposal {
1290 
    let p = &loaded.row;
1291 
    hub_api::Proposal {
1292 
        number: p.number,
1293 
        title: p.title.clone(),
1294 
        body: p.body.clone(),
1295 
        author: p.author.clone(),
1296 
        state: ProposalState::parse(&p.state).unwrap_or(ProposalState::Open),
1297 
        target: p.target.clone(),
1298 
        source: match p.source_kind.as_str() {
1299 
            "fork" => {
1300 
                let (o, n) = source_url
1301 
                    .as_deref()
1302 
                    .and_then(|u| u.rsplit_once('/'))
1303 
                    .and_then(|(b, n)| b.rsplit_once('/').map(|(_, o)| (o.to_string(), n.to_string())))
1304 
                    .unwrap_or_default();
1305 
                ProposalSource::Fork { owner: o, name: n, bookmark: p.source_bookmark.clone() }
1306 
            }
1307 
            "changes" => ProposalSource::Changes { hashes: p.source_changes() },
1308 
            _ => ProposalSource::Bookmark { bookmark: p.source_bookmark.clone() },
1309 
        },
1310 
        changes: loaded
1311 
            .changes
1312 
            .iter()
1313 
            .map(|c| hub_api::ChangeSummary {
1314 
                hash: c.hash.clone(),
1315 
                message: if c.body.is_empty() { c.title.clone() } else { format!("{}\n\n{}", c.title, c.body) },
1316 
                author: hub_api::Author {
1317 
                    name: c.author.name.clone(),
1318 
                    email: c.author.email.clone(),
1319 
                    key: c.author.key.clone(),
1320 
                    account: c.author.account.clone(),
1321 
                    note: hub_api::Author::note_for(&c.author.key, &c.author.account),
1322 
                },
1323 
                when_ms: c.when_ms,
1324 
                deps: c.deps.clone(),
1325 
                head: c.head,
1326 
                via: c.via.as_ref().map(|v| hub_api::Via {
1327 
                    name: v.name.clone(),
1328 
                    key: v.key.clone(),
1329 
                    scope: v.scope.clone(),
1330 
                    expires_ms: v.expires_ms,
1331 
                    revoked: v.revoked,
1332 
                }),
1333 
                signature: match &c.signature {
1334 
                    view::SigView::Unsigned => hub_api::Signature::Unsigned,
1335 
                    view::SigView::Valid { key, sealed, revoked, .. } => {
1336 
                        hub_api::Signature::Valid { key: key.clone(), sealed: *sealed, revoked: *revoked }
1337 
                    }
1338 
                    view::SigView::Invalid(why) => hub_api::Signature::Invalid { reason: why.clone() },
1339 
                },
1340 
            })
1341 
            .collect(),
1342 
        projected_heads: loaded.heads.iter().map(|h| h.to_hex()).collect(),
1343 
        projected_state: Some(loaded.state.clone()),
1344 
        conflicted: loaded.conflicted,
1345 
        approvals: v.approvals.clone(),
1346 
        landable: p.is_open() && v.blockers.is_empty(),
1347 
        blockers: v.blockers.clone(),
1348 
        created_ms: p.created_ms,
1349 
        updated_ms: p.updated_ms,
1350 
        url: format!("{}/{owner}/{name}/proposal/{}", app.config.base_url(), p.number),
1351 
        repository_url: format!("{}/{owner}/{name}", app.config.base_url()),
1352 
        source_url,
1353 
        landed: (p.state == "landed" && p.landed_ms > 0).then(|| hub_api::Landed {
1354 
            by: p.landed_by.clone(),
1355 
            via: p.landed_via.clone(),
1356 
            when_ms: p.landed_ms,
1357 
        }),
1358 
        requested_reviewers: pdb::review_requests(&app.db, p.id).await.unwrap_or_default(),
1359 
        labels: db::issues::proposal_labels(&app.db, p.id)
1360 
            .await
1361 
            .unwrap_or_default()
1362 
            .into_iter()
1363 
            .map(|l| hub_api::Label { name: l.name, colour: l.colour, description: l.description })
1364 
            .collect(),
1365 
    }
1366 
}
1367
1368 
/// The line comment form's placement key, for templates.
1369 
pub fn key(path: &str, line: impl filters::Num) -> (String, usize) {
1370 
    (path.to_string(), line.as_u64() as usize)
1371 
}
1372
1373 
#[allow(dead_code)]
1374 
fn _unused(_: &diff::Line, _: &ConflictView, _: &Role) {}
1375
1376 
// ------------------------------------------------------- review requests
1377
1378 
/// Ask accounts to review a proposal (hub plan 0.4): each must exist, be
1379 
/// someone other than the author, and be able to read the repository. Each
1380 
/// newly asked is told, and the proposal records it. The usernames newly
1381 
/// asked, or why none could be.
1382 
pub async fn request_reviewers(
1383 
    app: &Shared,
1384 
    row: &db::repos::RepoRow,
1385 
    p: &pdb::ProposalRow,
1386 
    by: &accounts::Account,
1387 
    names: &[String],
1388 
) -> Result<Vec<String>, String> {
1389 
    let mut found = Vec::new();
1390 
    for name in names.iter().map(|n| n.trim().trim_start_matches('@')).filter(|n| !n.is_empty()) {
1391 
        let Some(a) = accounts::account_by_name(&app.db, name).await.ok().flatten() else {
1392 
            return Err(format!("There is no account {name}."));
1393 
        };
1394 
        if Some(a.id) == p.author_id {
1395 
            return Err(format!("{name} wrote this proposal, and cannot review it."));
1396 
        }
1397 
        let role = crate::auth::roles::role_for(&app.db, Some(&a), row).await.ok().flatten();
1398 
        if !crate::auth::roles::allows(role, crate::auth::Access::Read) {
1399 
            return Err(format!("{name} cannot read this repository."));
1400 
        }
1401 
        found.push(a);
1402 
    }
1403 
    let mut asked = Vec::new();
1404 
    for a in found {
1405 
        if !pdb::request_review(&app.db, p.id, a.id, &by.username).await.map_err(|e| e.to_string())? {
1406 
            continue;
1407 
        }
1408 
        pdb::add_event(&app.db, p.id, &by.username, "review requested", &a.username).await.ok();
1409 
        crate::notify::deliver(
1410 
            app,
1411 
            crate::notify::Event {
1412 
                kind: "proposal.review_requested",
1413 
                title: format!("{}/{}#{}: {} (review requested from {})", row.owner, row.name, p.number, p.title, a.username),
1414 
                url: format!("/{}/{}/proposal/{}", row.owner, row.name, p.number),
1415 
                actor: by,
1416 
                repo_id: row.id,
1417 
                thread: None,
1418 
                mention_text: "",
1419 
                direct: vec![a.id],
1420 
            },
1421 
        )
1422 
        .await;
1423 
        asked.push(a.username);
1424 
    }
1425 
    Ok(asked)
1426 
}
1427
1428 
/// After a review: it answers the reviewer's request, if there was one, and
1429 
/// the proposal's author is told.
1430 
pub async fn reviewed(app: &Shared, row: &db::repos::RepoRow, p: &pdb::ProposalRow, by: &accounts::Account, verdict: &str) {
1431 
    pdb::unrequest_review(&app.db, p.id, by.id).await.ok();
1432 
    let what = match verdict {
1433 
        "approve" => "approved",
1434 
        "changes" => "changes requested",
1435 
        _ => "reviewed",
1436 
    };
1437 
    crate::notify::deliver(
1438 
        app,
1439 
        crate::notify::Event {
1440 
            kind: "proposal.review",
1441 
            title: format!("{}/{}#{}: {} ({what} by {})", row.owner, row.name, p.number, p.title, by.username),
1442 
            url: format!("/{}/{}/proposal/{}", row.owner, row.name, p.number),
1443 
            actor: by,
1444 
            repo_id: row.id,
1445 
            thread: Some(("proposal", p.id)),
1446 
            mention_text: "",
1447 
            direct: p.author_id.into_iter().collect(),
1448 
        },
1449 
    )
1450 
    .await;
1451 
}
1452
1453 
#[derive(Deserialize)]
1454 
pub struct ReviewersForm {
1455 
    #[serde(rename = "_csrf")]
1456 
    csrf_token: String,
1457 
    /// `add`, `remove`, or `set` (the menu: exactly these are asked).
1458 
    action: String,
1459 
    #[serde(default)]
1460 
    username: Vec<String>,
1461 
}
1462
1463 
/// `POST /{owner}/{name}/proposal/{number}/reviewers`: the author or a
1464 
/// writer asks someone to review, or withdraws the request.
1465 
pub async fn reviewers(
1466 
    State(app): State<Shared>,
1467 
    viewer: Viewer,
1468 
    Path((owner, name, number)): Path<(String, String, i64)>,
1469 
    axum_extra::extract::Form(f): axum_extra::extract::Form<ReviewersForm>,
1470 
) -> Result<Response, Error> {
1471 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1472 
    let me = require(&viewer, &shell)?;
1473 
    csrf(&viewer, &f.csrf_token, &shell)?;
1474 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1475 
    let p = pdb::get(&app.db, row.id, number)
1476 
        .await
1477 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1478 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1479 
    if Some(me.account.id) != p.author_id && role < Role::Write {
1480 
        return Err(Error::not_found(shell));
1481 
    }
1482 
    let names: Vec<String> = f.username.iter().map(|n| n.trim().trim_start_matches('@').to_string()).filter(|n| !n.is_empty()).collect();
1483 
    let current = pdb::review_requests(&app.db, p.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;
1484 
    // Withdrawn: those named (remove), or those the menu left out (set).
1485 
    let withdraw: Vec<String> = match f.action.as_str() {
1486 
        "remove" => names.clone(),
1487 
        "set" => current.iter().filter(|c| !names.iter().any(|n| n.eq_ignore_ascii_case(c))).cloned().collect(),
1488 
        _ => Vec::new(),
1489 
    };
1490 
    for who in &withdraw {
1491 
        if let Some(a) = accounts::account_by_name(&app.db, who).await.ok().flatten() {
1492 
            if pdb::unrequest_review(&app.db, p.id, a.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {
1493 
                pdb::add_event(&app.db, p.id, &me.account.username, "review request withdrawn", &a.username).await.ok();
1494 
            }
1495 
        }
1496 
    }
1497 
    let ask: Vec<String> = match f.action.as_str() {
1498 
        "add" => names,
1499 
        "set" => names.into_iter().filter(|n| !current.iter().any(|c| c.eq_ignore_ascii_case(n))).collect(),
1500 
        _ => return Ok(back(&owner, &name, number, "conversation", None, None)),
1501 
    };
1502 
    if ask.is_empty() {
1503 
        return Ok(back(&owner, &name, number, "conversation", None, None));
1504 
    }
1505 
    match request_reviewers(&app, &row, &p, &me.account, &ask).await {
1506 
        Ok(asked) if asked.is_empty() => Ok(back(&owner, &name, number, "conversation", Some("Already asked.".into()), None)),
1507 
        Ok(asked) => Ok(back(&owner, &name, number, "conversation", Some(format!("Asked {} to review.", asked.join(", "))), None)),
1508 
        Err(e) => Ok(back(&owner, &name, number, "conversation", None, Some(e))),
1509 
    }
1510 
}
1511
1512 
#[derive(Deserialize)]
1513 
pub struct AssistantForm {
1514 
    #[serde(rename = "_csrf")]
1515 
    csrf_token: String,
1516 
    assistant: String,
1517 
}
1518
1519 
/// `POST /{owner}/{name}/proposal/{number}/assistant`: the author or a
1520 
/// writer asks an AI assistant to review (hub spec §13.4). The answer
1521 
/// comes later as a review via the assistant.
1522 
pub async fn assistant(
1523 
    State(app): State<Shared>,
1524 
    viewer: Viewer,
1525 
    Path((owner, name, number)): Path<(String, String, i64)>,
1526 
    Form(f): Form<AssistantForm>,
1527 
) -> Result<Response, Error> {
1528 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1529 
    let me = require(&viewer, &shell)?;
1530 
    csrf(&viewer, &f.csrf_token, &shell)?;
1531 
    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1532 
    super::writable(&row, &shell)?;
1533 
    let p = pdb::get(&app.db, row.id, number)
1534 
        .await
1535 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1536 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1537 
    if Some(me.account.id) != p.author_id && role < Role::Write {
1538 
        return Err(Error::not_found(shell));
1539 
    }
1540 
    if !p.is_open() {
1541 
        return Ok(back(&owner, &name, number, "conversation", None, Some("The proposal is not open.".into())));
1542 
    }
1543 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
1544 
        .await
1545 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1546 
        .into_iter()
1547 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
1548 
    else {
1549 
        return Ok(back(&owner, &name, number, "conversation", None, Some(format!("No assistant called {} here.", f.assistant.trim()))));
1550 
    };
1551 
    let who = a.name.clone();
1552 
    match crate::assistants::request_review(&app, &row, &p, &me.account, a).await {
1553 
        Ok(()) => Ok(back(
1554 
            &owner,
1555 
            &name,
1556 
            number,
1557 
            "conversation",
1558 
            Some(format!("Asked {who} to review; its answer appears here when it comes.")),
1559 
            None,
1560 
        )),
1561 
        Err(e) => Ok(back(&owner, &name, number, "conversation", None, Some(format!("Not asked: {e}.")))),
1562 
    }
1563 
}
1564
1565 
/// The assistants a repository may use, by name.
1566 
async fn assistant_names(app: &Shared, row: &db::repos::RepoRow) -> Vec<String> {
1567 
    crate::assistants::enabled_for_repo(&app.db, row).await.unwrap_or_default().into_iter().map(|a| a.name).collect()
1568 
}
1569
1570 
/// The changes and the file diffs a proposal from `source` into `target`
1571 
/// would carry.
1572 
async fn preview_diff(
1573 
    app: &Shared,
1574 
    repo: &RepoName,
1575 
    target: &str,
1576 
    source: &str,
1577 
) -> Result<(Vec<ChangeView>, Vec<oxy_core::repo::FileDiff>), crate::repos::RepoError> {
1578 
    let Some((fork, bookmark)) = parse_source(app, repo, source) else { return Ok((vec![], vec![])) };
1579 
    let target = target.to_string();
1580 
    let fork_dir = fork.as_ref().map(|f| app.repos.dir(f));
1581 
    app.repos
1582 
        .read(repo, move |r, cache| {
1583 
            let projection = match &fork_dir {
1584 
                Some(dir) => {
1585 
                    let fork_repo = oxy_core::repo::Repo::open(dir)?;
1586 
                    let heads = fork_repo.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
1587 
                    pl::project(r, cache, &target, Source::Fork { fork: &fork_repo, heads })?
1588 
                }
1589 
                None => {
1590 
                    let heads = r.bookmarks()?.into_iter().find(|b| b.name == bookmark).map(|b| b.heads).unwrap_or_default();
1591 
                    pl::project(r, cache, &target, Source::Bookmark(heads))?
1592 
                }
1593 
            };
1594 
            Ok((projection.changes, projection.files))
1595 
        })
1596 
        .await
1597 
}
1598
1599 
/// `POST /{owner}/{name}/proposals/new/draft`: an assistant drafts the
1600 
/// description from the changes the proposal would add; the form comes
1601 
/// back with the draft to edit (hub spec §13.4).
1602 
pub async fn new_draft(
1603 
    State(app): State<Shared>,
1604 
    viewer: Viewer,
1605 
    Path((owner, name)): Path<(String, String)>,
1606 
    Form(f): Form<NewForm>,
1607 
) -> Result<Page<NewProposalPage>, Error> {
1608 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposals/new"), &viewer);
1609 
    let me = require(&viewer, &shell)?;
1610 
    csrf(&viewer, &f.csrf_token, &shell)?;
1611 
    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1612 
    super::writable(&row, &shell)?;
1613 
    let bookmarks =
1614 
        app.repos.read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().map(|b| b.name).collect::<Vec<_>>())).await.unwrap_or_default();
1615 
    let (preview, conflicted) = preview_for(&app, &repo, &f.target, &f.source).await.unwrap_or((vec![], false));
1616 
    let assistants = if preview.is_empty() { vec![] } else { assistant_names(&app, &row).await };
1617 
    let mut page = NewProposalPage {
1618 
        shell,
1619 
        repo: RepoShell::new(&app, &row, "proposals").with_role(role),
1620 
        bookmarks,
1621 
        source: f.source.clone(),
1622 
        target: f.target.clone(),
1623 
        error: None,
1624 
        preview,
1625 
        conflicted,
1626 
        title: f.title.clone(),
1627 
        body: f.body.clone(),
1628 
        assistants,
1629 
    };
1630 
    let assistant = crate::assistants::enabled_for_repo(&app.db, &row)
1631 
        .await
1632 
        .unwrap_or_default()
1633 
        .into_iter()
1634 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()));
1635 
    let Some(a) = assistant else {
1636 
        page.error = Some(format!("No assistant called {} here.", f.assistant.trim()));
1637 
        return Ok(Page(page));
1638 
    };
1639 
    if page.preview.is_empty() {
1640 
        page.error = Some("Nothing to describe: the source adds nothing to the target.".into());
1641 
        return Ok(Page(page));
1642 
    }
1643 
    let (changes, diffs) = match preview_diff(&app, &repo, &f.target, &f.source).await {
1644 
        Ok(x) => x,
1645 
        Err(e) => {
1646 
            page.error = Some(e.to_string());
1647 
            return Ok(Page(page));
1648 
        }
1649 
    };
1650 
    let d = crate::assistants::Draft { slot: -row.id, title: &f.title, target: &f.target, changes: &changes, diffs: &diffs };
1651 
    match crate::assistants::draft_description(&app, &row, &me.account, &a, d).await {
1652 
        Ok(text) => page.body = text,
1653 
        Err(why) => page.error = Some(format!("{} did not answer: {why}.", a.name)),
1654 
    }
1655 
    Ok(Page(page))
1656 
}
1657
1658 
#[derive(Deserialize)]
1659 
pub struct DraftForm {
1660 
    #[serde(rename = "_csrf")]
1661 
    csrf_token: String,
1662 
    assistant: String,
1663 
    #[serde(default)]
1664 
    title: String,
1665 
}
1666
1667 
/// `POST /{owner}/{name}/proposal/{number}/draft`: an assistant drafts the
1668 
/// description of an open proposal from its changes; the editor opens
1669 
/// with the draft, nothing is saved (hub spec §13.4).
1670 
pub async fn draft(
1671 
    State(app): State<Shared>,
1672 
    viewer: Viewer,
1673 
    Path((owner, name, number)): Path<(String, String, i64)>,
1674 
    Form(f): Form<DraftForm>,
1675 
) -> Result<Response, Error> {
1676 
    let shell = Shell::new(&app, &format!("/{owner}/{name}/proposal/{number}"), &viewer);
1677 
    let me = require(&viewer, &shell)?;
1678 
    csrf(&viewer, &f.csrf_token, &shell)?;
1679 
    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;
1680 
    super::writable(&row, &shell)?;
1681 
    let p = pdb::get(&app.db, row.id, number)
1682 
        .await
1683 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1684 
        .ok_or_else(|| Error::not_found(shell.clone()))?;
1685 
    if Some(me.account.id) != p.author_id && role < Role::Maintain {
1686 
        return Err(Error::not_found(shell));
1687 
    }
1688 
    let Some(a) = crate::assistants::enabled_for_repo(&app.db, &row)
1689 
        .await
1690 
        .map_err(|e| Error::from_db(shell.clone(), e))?
1691 
        .into_iter()
1692 
        .find(|a| a.name.eq_ignore_ascii_case(f.assistant.trim()))
1693 
    else {
1694 
        return Ok(back(&owner, &name, number, "conversation", None, Some(format!("No assistant called {} here.", f.assistant.trim()))));
1695 
    };
1696 
    let loaded = crate::web::proposals::load(&app, &repo, p.clone()).await.map_err(|e| Error::from_repo(shell.clone(), e))?;
1697 
    let title = if f.title.trim().is_empty() { p.title.clone() } else { f.title.clone() };
1698 
    let d = crate::assistants::Draft { slot: p.id, title: &title, target: &p.target, changes: &loaded.changes, diffs: &loaded.diffs };
1699 
    let draft = crate::assistants::draft_description(&app, &row, &me.account, &a, d).await;
1700 
    match draft {
1701 
        Ok(text) => {
1702 
            let mut page = detail(&app, shell, &viewer, &owner, &name, number, "conversation".into(), None, None).await?;
1703 
            page.0.draft = Some(text);
1704 
            Ok(page.into_response())
1705 
        }
1706 
        Err(why) => Ok(back(&owner, &name, number, "conversation", None, Some(format!("{} did not answer: {why}.", a.name)))),
1707 
    }
1708 
}