admin.rs 88.2%

447 of 507 lines run, 53 of 146 functions · run #522 on main · run missed
//! Site administration (hub spec §6.3 `/admin/*`): accounts, registration
//! mode and invitations, the audit log.

use super::settings::csrf;
use super::{filters, Error, Page, Shell};
use crate::auth::{self, Viewer};
use crate::db::accounts;
use crate::Shared;
use askama::Template;
use axum::extract::{Form, State};
use serde::Deserialize;

/// A page of the admin area (oxygenhub#288): grouped in a sidebar, one
/// page per section, as a repository's settings are (#278).
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum AdminSection {
    Overview,
    Accounts,
    Registration,
    Organisations,
    SignIn,
    SecurityContact,
    Mail,
    Runners,
    Images,
    RunnerSettings,
    RunnerUpdates,
    Insights,
    Variables,
    Secrets,
    Assistants,
    Diffusion,
    Storage,
    Backups,
    Audit,
}

/// The sidebar: each group's heading and its pages, in order.
const ADMIN_GROUPS: &[(&str, &[AdminSection])] = &[
    ("Overview", &[AdminSection::Overview]),
    ("People", &[AdminSection::Accounts, AdminSection::Registration, AdminSection::Organisations]),
    ("Sign-in", &[AdminSection::SignIn, AdminSection::SecurityContact]),
    ("Mail", &[AdminSection::Mail]),
    (
        "Flow",
        &[
            AdminSection::Runners,
            AdminSection::Images,
            AdminSection::RunnerSettings,
            AdminSection::RunnerUpdates,
            AdminSection::Insights,
            AdminSection::Variables,
            AdminSection::Secrets,
        ],
    ),
    ("Integrations", &[AdminSection::Assistants, AdminSection::Diffusion]),
    ("Data", &[AdminSection::Storage, AdminSection::Backups]),
    ("Audit", &[AdminSection::Audit]),
];

/// The admin sidebar's groups, for templates.
pub fn admin_groups() -> &'static [(&'static str, &'static [AdminSection])] {
    ADMIN_GROUPS
}

impl AdminSection {
    /// Its page's address.
    pub fn href(self) -> &'static str {
        match self {
            AdminSection::Overview => "/admin",
            AdminSection::Accounts => "/admin/accounts",
            AdminSection::Registration => "/admin/registration",
            AdminSection::Organisations => "/admin/organisations",
            AdminSection::SignIn => "/admin/signin",
            AdminSection::SecurityContact => "/admin/security",
            AdminSection::Mail => "/admin/mail",
            AdminSection::Runners => "/admin/runners",
            AdminSection::Images => "/admin/runners/images",
            AdminSection::RunnerSettings => "/admin/runners/settings",
            AdminSection::RunnerUpdates => "/admin/runners/updates",
            AdminSection::Insights => "/admin/insights",
            AdminSection::Variables => "/admin/variables",
            AdminSection::Secrets => "/admin/secrets",
            AdminSection::Assistants => "/admin/assistants",
            AdminSection::Diffusion => "/admin/diffusion",
            AdminSection::Storage => "/admin/storage",
            AdminSection::Backups => "/admin/backups",
            AdminSection::Audit => "/admin/audit",
        }
    }

    /// The anchor it had on the one-page admin, so a kept `/admin#mail`
    /// link opens its page (hub.js).
    pub fn slug(self) -> &'static str {
        match self {
            AdminSection::Overview => "overview",
            AdminSection::Accounts => "accounts",
            AdminSection::Registration => "registration",
            AdminSection::Organisations => "organisations",
            AdminSection::SignIn => "signin",
            AdminSection::SecurityContact => "security",
            AdminSection::Mail => "mail",
            AdminSection::Runners => "runners",
            AdminSection::Images => "images",
            AdminSection::RunnerSettings => "runner-settings",
            AdminSection::RunnerUpdates => "runner-updates",
            AdminSection::Insights => "insights",
            AdminSection::Variables => "variables",
            AdminSection::Secrets => "secrets",
            AdminSection::Assistants => "assistants",
            AdminSection::Diffusion => "diffusion",
            AdminSection::Storage => "storage",
            AdminSection::Backups => "backups",
            AdminSection::Audit => "audit",
        }
    }

    pub fn title(self) -> &'static str {
        match self {
            AdminSection::Overview => "Overview",
            AdminSection::Accounts => "Accounts",
            AdminSection::Registration => "Registration & invitations",
            AdminSection::Organisations => "Organisations",
            AdminSection::SignIn => "Sign in with",
            AdminSection::SecurityContact => "Security contact",
            AdminSection::Mail => "Mail",
            AdminSection::Runners => "Runners",
            AdminSection::Images => "Images",
            AdminSection::RunnerSettings => "Runner settings",
            AdminSection::RunnerUpdates => "Runner updates",
            AdminSection::Insights => "Insights",
            AdminSection::Variables => "Variables",
            AdminSection::Secrets => "Secrets",
            AdminSection::Assistants => "AI assistants",
            AdminSection::Diffusion => "Diffusion",
            AdminSection::Storage => "Storage & maintenance",
            AdminSection::Backups => "Backups",
            AdminSection::Audit => "Audit log",
        }
    }

    /// The section a page of admin.html shows, by its address.
    fn of_path(path: &str) -> Option<AdminSection> {
        ADMIN_GROUPS.iter().flat_map(|(_, pages)| pages.iter().copied()).find(|s| s.href() == path)
    }
}

#[derive(Template)]
#[template(path = "admin.html")]
pub struct AdminPage {
    shell: Shell,
    /// The page shown (oxygenhub#288).
    section: AdminSection,
    accounts: Vec<accounts::Account>,
    orgs: Vec<accounts::Organisation>,
    mode: String,
    invitations: Vec<(String, Option<i64>, i64)>,
    audit: Vec<accounts::AuditRow>,
    repos: usize,
    notice: Option<String>,
    /// Mail settings (#101): the SMTP URL with its password masked, the
    /// From address, whether mail is on, and the administrator's own
    /// address for a test message.
    mail_smtp: String,
    mail_from: String,
    mail_enabled: bool,
    /// The saved mail settings as the panel shows them (oxygenhub#181).
    mail: crate::mail::Choice,
    my_email: String,
    /// The audit log's next page: rows older than this id (#110).
    audit_older: Option<i64>,
    /// The site's AI assistants and prompt (#97).
    assistants: super::assistants::Panel,
    /// The site's Flow variables (#102).
    variables: super::variables::Panel,
    /// The site's Flow secrets (#107).
    secrets: super::secrets::Panel,
    /// Sign-in providers (#106).
    providers: Vec<super::signin::ProviderView>,
    /// The security.txt contact and policy (oxygenhub#224).
    security_contact: String,
    security_policy: String,
    /// The /security-contact page's address and text (oxygenhub#230).
    security_email: String,
    security_page: String,
    security_default: &'static str,
}

pub(super) fn require_admin(viewer: &Viewer, shell: &Shell) -> Result<accounts::Account, Error> {
    match viewer.account() {
        Some(a) if a.is_admin => Ok(a.clone()),
        _ => Err(Error::not_found(shell.clone())),
    }
}

pub(super) async fn admin_page(
    app: &Shared,
    shell: Shell,
    section: AdminSection,
    notice: Option<String>,
) -> Result<Page<AdminPage>, Error> {
    admin_page_at(app, shell, section, notice, None).await
}

/// The audit log shows this many rows a page.
const AUDIT_PAGE: i64 = 50;

async fn admin_page_at(
    app: &Shared,
    shell: Shell,
    section: AdminSection,
    notice: Option<String>,
    audit_before: Option<i64>,
) -> Result<Page<AdminPage>, Error> {
    let e = |e| Error::from_db(shell.clone(), e);
    let accounts_list = accounts::accounts(&app.db).await.map_err(e)?;
    let orgs = accounts::orgs(&app.db).await.map_err(e)?;
    let mode = super::session::registration_mode(app).await;
    let invitations = accounts::invitations(&app.db).await.map_err(e)?;
    let mut audit = accounts::audit_page(&app.db, audit_before, AUDIT_PAGE + 1).await.map_err(e)?;
    let audit_older = if audit.len() as i64 > AUDIT_PAGE {
        audit.truncate(AUDIT_PAGE as usize);
        audit.last().map(|r| r.id)
    } else {
        None
    };
    let repos = crate::db::repos::list(&app.db).await.map_err(e)?.len();
    let mail = crate::mail::settings(app);
    let my_email = match shell.user.as_deref() {
        Some(u) => accounts::account_by_name(&app.db, u).await.map_err(e)?.map(|a| a.email).unwrap_or_default(),
        None => String::new(),
    };
    let assistants = super::assistants::panel(app, &site_assistants()).await.map_err(e)?;
    let variables = super::variables::panel(app, &site_assistants()).await.map_err(e)?;
    let secrets = super::secrets::panel(app, &site_assistants()).await.map_err(e)?;
    let providers = super::signin::provider_views(app).await.map_err(e)?;
    let (security_contact, security_policy) = super::security_txt::settings(app).await;
    let (security_email, security_page) = super::security_txt::page_settings(app).await;
    Ok(Page(AdminPage {
        section,
        providers,
        security_contact,
        security_policy,
        security_email,
        security_page,
        security_default: super::security_txt::DEFAULT_PAGE,
        assistants,
        variables,
        secrets,
        shell,
        accounts: accounts_list,
        orgs,
        mode,
        invitations,
        audit,
        repos,
        notice,
        mail: crate::mail::describe(&mail.smtp),
        mail_smtp: crate::mail::masked(&mail.smtp),
        mail_from: mail.from.clone(),
        mail_enabled: !mail.smtp.is_empty() && !mail.from.is_empty(),
        my_email,
        audit_older,
    }))
}

impl AdminPage {
    fn mail_services(&self) -> &'static [(&'static str, &'static str)] {
        crate::mail::SERVICES
    }
}

#[derive(Deserialize)]
pub struct MailForm {
    #[serde(rename = "_csrf")]
    csrf_token: String,
    #[serde(default)]
    smtp: String,
    #[serde(default)]
    from: String,
    /// The panel's service (oxygenhub#181); absent, `smtp` is the URL as
    /// before.
    #[serde(default)]
    service: String,
    #[serde(default)]
    region: String,
    #[serde(default)]
    user: String,
    #[serde(default)]
    secret: String,
    #[serde(default)]
    host: String,
    #[serde(default)]
    port: String,
    #[serde(default)]
    security: String,
}

/// `POST /admin/mail`: the SMTP URL and From address (#101). The URL
/// comes back masked, so a masked value left as it was keeps the stored
/// one; an empty URL turns mail off.
pub async fn set_mail(State(app): State<Shared>, viewer: Viewer, Form(f): Form<MailForm>) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    let me = require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    let current = crate::mail::settings(&app);
    // A service the panel knows: it makes the SMTP URL (oxygenhub#181).
    let smtp = match f.service.as_str() {
        "off" => String::new(),
        "" | "url" => {
            let smtp = f.smtp.trim();
            if !current.smtp.is_empty() && smtp == crate::mail::masked(&current.smtp) {
                current.smtp.clone()
            } else {
                smtp.to_string()
            }
        }
        _ => {
            let asked = crate::mail::Asked {
                service: f.service.clone(),
                region: f.region.clone(),
                user: f.user.clone(),
                secret: f.secret.trim().to_string(),
                host: f.host.clone(),
                port: f.port.clone(),
                security: f.security.clone(),
            };
            match crate::mail::compose(&asked, &current.smtp) {
                Ok(url) => url,
                Err(why) => return admin_page(&app, shell, AdminSection::Mail, Some(why)).await,
            }
        }
    };
    let from = f.from.trim().to_string();
    if !smtp.is_empty() && !(smtp.starts_with("smtp://") || smtp.starts_with("smtps://") || smtp.starts_with("file://")) {
        return admin_page(
            &app,
            shell,
            AdminSection::Mail,
            Some("The SMTP URL starts with smtp:// or smtps:// (file:///dir writes messages to a directory, for testing).".into()),
        )
        .await;
    }
    if !smtp.is_empty() && from.is_empty() {
        return admin_page(&app, shell, AdminSection::Mail, Some("A From address is needed: OxygenHub <[email protected]>.".into()))
            .await;
    }
    crate::mail::save(&app, &smtp, &from).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    accounts::audit(&app.db, Some(&me), "admin.mail", if smtp.is_empty() { "off" } else { "on" }, &from).await.ok();
    admin_page(&app, shell, AdminSection::Mail, Some(if smtp.is_empty() { "Mail is off.".into() } else { "Mail settings saved.".into() }))
        .await
}

/// `POST /admin/mail/test`: a message to the administrator's own address.
pub async fn test_mail(
    State(app): State<Shared>,
    viewer: Viewer,
    Form(f): Form<super::session::CsrfForm>,
) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    let me = require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf, &shell)?;
    if !crate::mail::enabled(&app) {
        return admin_page(&app, shell, AdminSection::Mail, Some("Mail is off; save an SMTP URL and a From address first.".into())).await;
    }
    if me.email.is_empty() {
        return admin_page(&app, shell, AdminSection::Mail, Some("Your account has no email address to send the test to.".into())).await;
    }
    let base = app.config.base_url().to_string();
    let notice = match crate::mail::send_letter(
        &app,
        me.name(),
        &me.email,
        "🧪 Test message",
        "This is a test message from your hub's mail settings. If you can read it, mail works: verification links, password resets and notifications will reach people.",
        Some(crate::mail::Action { label: "Open the hub", url: &base }),
        None,
    )
    .await
    {
        Ok(()) => format!("Sent a test message to {}.", me.email),
        Err(e) => format!("Sending failed: {e}"),
    };
    admin_page(&app, shell, AdminSection::Mail, Some(notice)).await
}

#[derive(Deserialize)]
pub struct IndexQuery {
    audit_before: Option<i64>,
}

pub async fn index(
    State(app): State<Shared>,
    viewer: Viewer,
    axum::extract::Query(q): axum::extract::Query<IndexQuery>,
) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    require_admin(&viewer, &shell)?;
    admin_page_at(&app, shell, AdminSection::Overview, None, q.audit_before).await
}

/// `GET /admin/{page}` for the sections admin.html shows (oxygenhub#288):
/// accounts, registration, organisations, sign-in, the security contact,
/// mail, variables, secrets, AI assistants and the audit log.
pub async fn section(
    State(app): State<Shared>,
    viewer: Viewer,
    uri: axum::http::Uri,
    axum::extract::Query(q): axum::extract::Query<IndexQuery>,
) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, uri.path(), &viewer);
    require_admin(&viewer, &shell)?;
    let section = AdminSection::of_path(uri.path()).ok_or_else(|| Error::not_found(shell.clone()))?;
    admin_page_at(&app, shell, section, None, q.audit_before).await
}

#[derive(Deserialize)]
pub struct ModeForm {
    #[serde(rename = "_csrf")]
    csrf_token: String,
    mode: String,
}

pub async fn set_mode(State(app): State<Shared>, viewer: Viewer, Form(f): Form<ModeForm>) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    let me = require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    if !matches!(f.mode.as_str(), "open" | "invite" | "closed") {
        return Err(Error::bad(shell, "mode is open, invite or closed"));
    }
    accounts::set_setting(&app.db, "registration_mode", &f.mode).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    accounts::audit(&app.db, Some(&me), "admin.registration", &f.mode, "").await.ok();
    admin_page(&app, shell, AdminSection::Registration, Some(format!("Registration is {}.", f.mode))).await
}

pub async fn invite(State(app): State<Shared>, viewer: Viewer, Form(f): Form<super::session::CsrfForm>) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    let me = require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf, &shell)?;
    let code = auth::random_hex(12);
    accounts::create_invitation(&app.db, &code, Some(me.id)).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    accounts::audit(&app.db, Some(&me), "admin.invite", &code, "").await.ok();
    admin_page(
        &app,
        shell,
        AdminSection::Registration,
        Some(format!("Invitation created: {}/register?invite={code}", app.config.base_url())),
    )
    .await
}

#[derive(Deserialize)]
pub struct AccountForm {
    #[serde(rename = "_csrf")]
    csrf_token: String,
    username: String,
    action: String,
    /// For delete: the username typed again.
    #[serde(default)]
    confirm: String,
}

pub async fn account(State(app): State<Shared>, viewer: Viewer, Form(f): Form<AccountForm>) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    let me = require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    let Some(target) = accounts::account_by_name(&app.db, f.username.trim()).await.map_err(|e| Error::from_db(shell.clone(), e))? else {
        return admin_page(&app, shell, AdminSection::Accounts, Some("No such account.".into())).await;
    };
    if target.id == me.id && matches!(f.action.as_str(), "ban" | "demote" | "disable" | "delete") {
        return admin_page(&app, shell, AdminSection::Accounts, Some("Not on yourself.".into())).await;
    }
    let e = |e| Error::from_db(shell.clone(), e);
    // The hub must keep an admin who can sign in (oxygenhub#81).
    if target.is_admin && matches!(f.action.as_str(), "disable" | "delete") {
        let others =
            accounts::accounts(&app.db).await.map_err(e)?.into_iter().filter(|a| a.is_admin && !a.blocked() && a.id != target.id).count();
        if others == 0 {
            return admin_page(
                &app,
                shell,
                AdminSection::Accounts,
                Some(format!("{} is the last admin who can sign in.", target.username)),
            )
            .await;
        }
    }
    if f.action == "delete" {
        if f.confirm.trim() != target.username {
            return admin_page(&app, shell, AdminSection::Accounts, Some(format!("Not deleted: type {} to confirm.", target.username)))
                .await;
        }
        let repos = crate::db::repos::list_by_owner(&app.db, &target.username).await.map_err(e)?;
        let orgs = accounts::orgs_owned_only_by(&app.db, target.id).await.map_err(e)?;
        if !repos.is_empty() || !orgs.is_empty() {
            let mut held: Vec<String> = repos.iter().map(|r| r.slug()).collect();
            held.extend(orgs.iter().map(|o| format!("organisation {o} (sole owner)")));
            return admin_page(
                &app,
                shell,
                AdminSection::Accounts,
                Some(format!("Not deleted: {} still owns {}. Transfer or delete them first.", target.username, held.join(", "))),
            )
            .await;
        }
        accounts::delete_account(&app.db, target.id, &target.username).await.map_err(e)?;
        accounts::audit(&app.db, Some(&me), "admin.account.delete", &target.username, "").await.ok();
        return admin_page(&app, shell, AdminSection::Accounts, Some(format!("{} deleted; the name stays retired.", target.username)))
            .await;
    }
    if f.action == "reset_link" {
        if target.blocked() {
            return admin_page(&app, shell, AdminSection::Accounts, Some("A banned or disabled account cannot be reset.".into())).await;
        }
        let url = super::recovery::admin_reset_link(&app, &me, &target).await.map_err(e)?;
        return admin_page(
            &app,
            shell,
            AdminSection::Accounts,
            Some(format!("Reset link for {} (works once, for 24 hours; shown only now): {url}", target.username)),
        )
        .await;
    }
    match f.action.as_str() {
        "ban" => accounts::set_banned(&app.db, target.id, true).await.map_err(e)?,
        "unban" => accounts::set_banned(&app.db, target.id, false).await.map_err(e)?,
        "disable" => accounts::set_disabled(&app.db, target.id, true).await.map_err(e)?,
        "enable" => accounts::set_disabled(&app.db, target.id, false).await.map_err(e)?,
        "promote" => accounts::set_admin(&app.db, target.id, true).await.map_err(e)?,
        "demote" => accounts::set_admin(&app.db, target.id, false).await.map_err(e)?,
        _ => return Err(Error::bad(shell, "unknown action")),
    }
    accounts::audit(&app.db, Some(&me), &format!("admin.account.{}", f.action), &target.username, "").await.ok();
    admin_page(&app, shell, AdminSection::Accounts, Some(format!("{}: {}.", target.username, f.action))).await
}

// ------------------------------------------------------------------ storage

/// One repository's footprint on disk.
pub struct StorageRow {
    pub slug: String,
    /// A drop (#279), labelled as one.
    pub drop: bool,
    pub bytes: u64,
    /// Objects not yet in a pack.
    pub loose: usize,
    pub packs: usize,
}

#[derive(Template)]
#[template(path = "admin_storage.html")]
pub struct StoragePage {
    shell: Shell,
    rows: Vec<StorageRow>,
    total: u64,
    notice: Option<String>,
    error: Option<String>,
}

/// Size, loose objects and packs under a repository directory.
fn footprint(dir: &std::path::Path) -> (u64, usize, usize) {
    let (mut bytes, mut loose, mut packs) = (0u64, 0usize, 0usize);
    let mut stack = vec![dir.to_path_buf()];
    while let Some(d) = stack.pop() {
        let Ok(rd) = std::fs::read_dir(&d) else { continue };
        for e in rd.flatten() {
            let Ok(ft) = e.file_type() else { continue };
            if ft.is_dir() {
                stack.push(e.path());
            } else if ft.is_file() {
                bytes += e.metadata().map(|m| m.len()).unwrap_or(0);
                let p = e.path();
                if p.components().any(|c| c.as_os_str() == "loose") {
                    loose += 1;
                } else if p.extension().is_some_and(|x| x == "pack") {
                    packs += 1;
                }
            }
        }
    }
    (bytes, loose, packs)
}

async fn storage_page(app: &Shared, shell: Shell, notice: Option<String>, error: Option<String>) -> Result<Page<StoragePage>, Error> {
    // Drops too, labelled as such (#279).
    let repos = crate::db::repos::list_with_drops(&app.db).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    let dirs: Vec<(String, bool, std::path::PathBuf)> = repos
        .iter()
        .filter_map(|r| crate::repos::RepoName::new(&r.owner, &r.name).map(|n| (n.to_string(), r.is_drop(), app.repos.dir(&n))))
        .collect();
    let mut rows = tokio::task::spawn_blocking(move || {
        dirs.into_iter()
            .map(|(slug, drop, dir)| {
                let (bytes, loose, packs) = footprint(&dir);
                StorageRow { slug, drop, bytes, loose, packs }
            })
            .collect::<Vec<_>>()
    })
    .await
    .unwrap_or_default();
    rows.sort_by_key(|r| std::cmp::Reverse(r.bytes));
    let total = rows.iter().map(|r| r.bytes).sum();
    Ok(Page(StoragePage { shell, rows, total, notice, error }))
}

pub async fn storage(State(app): State<Shared>, viewer: Viewer) -> Result<Page<StoragePage>, Error> {
    let shell = Shell::new(&app, "/admin/storage", &viewer);
    require_admin(&viewer, &shell)?;
    storage_page(&app, shell, None, None).await
}

#[derive(Deserialize)]
pub struct MaintainForm {
    #[serde(rename = "_csrf")]
    csrf_token: String,
    /// `owner/name`, or `*` for every repository.
    repo: String,
}

/// `POST /admin/storage`: `oxy gc` on one repository or all of them, under
/// each repository's write lock, with the grace period kept.
pub async fn maintain(State(app): State<Shared>, viewer: Viewer, Form(f): Form<MaintainForm>) -> Result<Page<StoragePage>, Error> {
    let shell = Shell::new(&app, "/admin/storage", &viewer);
    let me = require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    let names: Vec<crate::repos::RepoName> = if f.repo == "*" {
        crate::db::repos::list_with_drops(&app.db)
            .await
            .map_err(|e| Error::from_db(shell.clone(), e))?
            .iter()
            .filter_map(|r| crate::repos::RepoName::new(&r.owner, &r.name))
            .collect()
    } else {
        match crate::repos::RepoName::parse(&f.repo) {
            Some(n) if app.repos.exists(&n) => vec![n],
            _ => return storage_page(&app, shell, None, Some(format!("No repository {}.", f.repo))).await,
        }
    };
    let (mut packed, mut pruned, mut freed, mut failed) = (0usize, 0usize, 0u64, Vec::new());
    for name in &names {
        match app.repos.write(name, |r, _| r.gc(false).map_err(crate::repos::RepoError::Oxy)).await {
            Ok(rep) => {
                packed += rep.packed.objects;
                pruned += rep.pruned.objects;
                freed += rep.pruned.bytes + rep.packed.raw_bytes.saturating_sub(rep.packed.packed_bytes);
            }
            Err(e) => failed.push(format!("{name}: {e}")),
        }
    }
    let summary = format!(
        "Maintained {} repositor{}: {packed} loose objects packed, {pruned} unreachable objects pruned, about {} saved.",
        names.len(),
        if names.len() == 1 { "y" } else { "ies" },
        crate::render::bytes(freed)
    );
    accounts::audit(&app.db, Some(&me), "admin.gc", &f.repo, &summary).await.ok();
    let error = (!failed.is_empty()).then(|| failed.join("; "));
    storage_page(&app, shell, Some(summary), error).await
}

fn site_assistants() -> crate::levels::At {
    crate::levels::At::site()
}

/// `POST /admin/assistants`: the site's assistants and prompt (#97).
pub async fn assistants(
    State(app): State<Shared>,
    viewer: Viewer,
    Form(f): Form<super::assistants::AssistantForm>,
) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    let outcome = super::assistants::apply(&app, &viewer, &site_assistants(), f).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    admin_page(&app, shell, AdminSection::Assistants, Some(outcome.unwrap_or_else(|e| e))).await
}

/// `POST /admin/variables`: the site's Flow variables (#102).
pub async fn variables(
    State(app): State<Shared>,
    viewer: Viewer,
    Form(f): Form<super::variables::VariableForm>,
) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    let outcome = super::variables::apply(&app, &viewer, &site_assistants(), f).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    admin_page(&app, shell, AdminSection::Variables, Some(outcome.unwrap_or_else(|e| e))).await
}

/// `POST /admin/secrets`: the site's Flow secrets (#107).
pub async fn secrets(
    State(app): State<Shared>,
    viewer: Viewer,
    Form(f): Form<super::secrets::SecretForm>,
) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    let outcome = super::secrets::apply(&app, &viewer, &site_assistants(), f).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    admin_page(&app, shell, AdminSection::Secrets, Some(outcome.unwrap_or_else(|e| e))).await
}

/// `POST /admin/signin`: a sign-in provider's client id, secret and switch (#106).
pub async fn signin(
    State(app): State<Shared>,
    viewer: Viewer,
    Form(f): Form<super::signin::ProviderForm>,
) -> Result<Page<AdminPage>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    let outcome = super::signin::apply(&app, &viewer, f).await.map_err(|e| Error::from_db(shell.clone(), e))?;
    admin_page(&app, shell, AdminSection::SignIn, Some(outcome.unwrap_or_else(|e| e))).await
}

/// `POST /admin/assistants/models`: what a provider offers, as JSON (#109).
pub async fn assistant_models(
    State(app): State<Shared>,
    viewer: Viewer,
    Form(f): Form<super::assistants::ModelsForm>,
) -> Result<axum::Json<serde_json::Value>, Error> {
    let shell = Shell::new(&app, "/admin", &viewer);
    require_admin(&viewer, &shell)?;
    csrf(&viewer, &f.csrf_token, &shell)?;
    Ok(axum::Json(super::assistants::models(&app, &site_assistants(), f).await.map_err(|e| Error::from_db(shell.clone(), e))?))
}
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