//! Pages (hub spec §6): the router, the shell every template extends, the

//! error page, viewer-aware lookups and askama filters. Handlers are thin:

//! they resolve names, call the view layer under the repository lock, and

//! render.

mod admin;

mod avatar;

pub mod edit;

pub mod filters;

pub mod flow;

mod forks;

pub mod history;

mod home;

mod inbox;

pub mod issues;

mod orgs;

pub mod proposals;

mod refs;

pub mod releases;

mod repo;

mod repo_settings;

mod session;

mod settings;

mod statics;

use crate::auth::{self, Access, Role, Viewer};

use crate::repos::RepoError;

use crate::{db, Shared};

use askama::Template;

use axum::extract::DefaultBodyLimit;

use axum::http::{header, StatusCode};

use axum::response::{Html, IntoResponse, Redirect, Response};

use axum::routing::{any, get, post};

use axum::Router;

use tower_http::compression::CompressionLayer;

use tower_http::trace::TraceLayer;

pub fn router(app: Shared) -> Router {

    let push_limit = app.config.limits.push_body_limit.0 as usize;

    Router::new()

        .route("/", get(home::index))

        .route("/explore", get(home::explore))

        .route("/avatar/{name}", get(avatar::avatar))

        .route("/health", get(home::health))

        .route("/.well-known/oxyhub-key", get(home::hub_key))

        .route("/style.css", get(statics::style))

        .route("/favicon.svg", get(statics::favicon))

        .route("/favicon.ico", get(statics::favicon))

        .route("/static/{*path}", get(statics::asset))

        .route("/login", get(session::login_form).post(session::login))

        .route("/logout", post(session::logout))

        .route("/register", get(session::register_form).post(session::register))

        .route("/settings", get(settings::profile).post(settings::update_profile))

        .route("/settings/password", post(settings::change_password))

        .route("/settings/appearance", post(settings::appearance))

        .route("/settings/security", get(settings::security))

        .route("/settings/security/totp/begin", post(settings::totp_begin))

        .route("/settings/security/totp/enable", post(settings::totp_enable))

        .route("/settings/security/totp/disable", post(settings::totp_disable))

        .route("/settings/security/sessions", post(settings::sessions_reset))

        .route("/settings/keys", get(settings::keys))

        .route("/settings/keys/upload", post(settings::keys_upload))

        .route("/settings/keys/verify", post(settings::keys_verify))

        .route("/settings/keys/unlink", post(settings::keys_unlink))

        .route("/settings/tokens", get(settings::tokens).post(settings::tokens_create))

        .route("/settings/tokens/{id}/delete", post(settings::tokens_delete))

        .route("/new", get(repo_settings::new_form).post(repo_settings::create))

        .route("/orgs/new", get(orgs::new_form).post(orgs::create))

        .route("/orgs/{name}/settings", get(orgs::settings).post(orgs::update))

        .route("/orgs/{name}/settings/members", post(orgs::member))

        .route("/orgs/{name}/settings/teams", post(orgs::team))

        .route("/notifications", get(inbox::inbox))

        .route("/notifications/read", post(inbox::mark_read))

        .route("/settings/notifications", get(inbox::unsubscribe).post(inbox::prefs))

        .route("/search", get(inbox::search))

        .route("/admin", get(admin::index))

        .route("/admin/registration", post(admin::set_mode))

        .route("/admin/invite", post(admin::invite))

        .route("/admin/account", post(admin::account))

        .nest("/api/v1", crate::api::router())

        .route("/{owner}", get(home::owner))

        .route("/{owner}/{name}", get(repo::overview))

        .route("/{owner}/{name}/tree/{r}", get(repo::tree_root))

        .route("/{owner}/{name}/tree/{r}/{*path}", get(repo::tree))

        .route("/{owner}/{name}/file/{r}/{*path}", get(repo::file))

        .route("/{owner}/{name}/last/{r}", get(repo::last_changes))

        .route("/{owner}/{name}/changes/{r}", get(history::history))

        .route("/{owner}/{name}/change/{hash}", get(history::change))

        .route("/{owner}/{name}/compare/{spec}", get(history::compare))

        .route("/{owner}/{name}/bookmarks", get(refs::bookmarks))

        .route("/{owner}/{name}/tags", get(refs::tags))

        .route("/{owner}/{name}/conflicts", get(refs::conflicts))

        .route("/{owner}/{name}/trust", get(refs::trust))

        .route("/{owner}/{name}/pushes", get(refs::pushes))

        .route("/{owner}/{name}/fork", get(forks::form).post(forks::create))

        .route("/{owner}/{name}/forks", get(forks::list))

        .route("/{owner}/{name}/settings", get(repo_settings::settings).post(repo_settings::update))

        .route("/{owner}/{name}/settings/collaborators", post(repo_settings::collaborator))

        .route("/{owner}/{name}/settings/delete", post(repo_settings::delete))

        .route("/{owner}/{name}/settings/requirements", post(repo_settings::requirements))

        .route("/{owner}/{name}/proposals", get(proposals::list))

        .route("/{owner}/{name}/proposals/new", get(proposals::new_form).post(proposals::create))

        .route("/{owner}/{name}/proposal/{number}", get(proposals::show))

        .route("/{owner}/{name}/proposal/{number}/comment", post(proposals::comment))

        .route("/{owner}/{name}/proposal/{number}/comment/{id}/resolve", post(proposals::resolve_comment))

        .route("/{owner}/{name}/proposal/{number}/review", post(proposals::review))

        .route("/{owner}/{name}/proposal/{number}/edit", post(proposals::edit))

        .route("/{owner}/{name}/proposal/{number}/state", post(proposals::state))

        .route("/{owner}/{name}/proposal/{number}/land", post(proposals::land))

        .route("/{owner}/{name}/proposal/{number}/labels", post(proposals::set_labels))

        .route("/{owner}/{name}/proposal/{number}/events", get(proposals::events))

        .route("/{owner}/{name}/settings/hooks", post(repo_settings::hooks))

        .route("/{owner}/{name}/settings/hooks/{id}/deliveries", get(repo_settings::deliveries))

        .route("/{owner}/{name}/settings/hooks/{id}/redeliver/{delivery}", post(repo_settings::redeliver))

        .route("/{owner}/{name}/settings/checks", post(repo_settings::required_checks))

        .route("/{owner}/{name}/watch", post(issues::watch))

        .route("/{owner}/{name}/star", post(issues::star))

        .route("/{owner}/{name}/edit/{r}", post(edit::save))

        .route("/{owner}/{name}/edit/{r}/{*path}", get(edit::edit_form))

        .route("/{owner}/{name}/newfile/{r}", get(edit::new_form))

        .route("/{owner}/{name}/flow", get(flow::runs))

        .route("/{owner}/{name}/flow/{id}", get(flow::run))

        .route("/{owner}/{name}/flow/{id}/live", get(flow::live))

        .route("/{owner}/{name}/releases", get(releases::list))

        .route("/{owner}/{name}/releases/new", get(releases::new_form).post(releases::create))

        .route("/{owner}/{name}/releases/tag/{*tag}", get(releases::show))

        .route("/{owner}/{name}/releases/edit/{id}", post(releases::edit))

        .route(

            "/{owner}/{name}/releases/upload/{id}",

            post(releases::upload).layer(DefaultBodyLimit::max(app.config.limits.asset_limit.0 as usize + (1 << 20))),

        )

        .route("/{owner}/{name}/asset/{id}/{file}", get(releases::download))

        .route("/{owner}/{name}/archive", get(releases::source_archive))

        .route("/{owner}/{name}/search", get(repo::code_search))

        .route("/{owner}/{name}/info/{*rest}", any(git_info))

        .route("/{owner}/{name}/HEAD", get(git_head))

        .route("/{owner}/{name}/objects/{*rest}", get(git_objects))

        .route("/{owner}/{name}/git-upload-pack", post(git_upload_pack))

        .route("/{owner}/{name}/git-receive-pack", post(git_receive_pack))

        .route("/{owner}/{name}/settings/mirror", post(repo_settings::mirror))

        .route("/{owner}/{name}/issues", get(issues::list))

        .route("/{owner}/{name}/issues/new", get(issues::new_form).post(issues::create))

        .route("/{owner}/{name}/issue/{number}", get(issues::show))

        .route("/{owner}/{name}/issue/{number}/comment", post(issues::comment))

        .route("/{owner}/{name}/issue/{number}/comment/{id}/delete", post(issues::delete_comment))

        .route("/{owner}/{name}/issue/{number}/edit", post(issues::edit))

        .route("/{owner}/{name}/issue/{number}/state", post(issues::state))

        .route("/{owner}/{name}/issue/{number}/labels", post(issues::set_labels))

        .route("/{owner}/{name}/issue/{number}/assign", post(issues::assign))

        .route("/{owner}/{name}/issue/{number}/milestone", post(issues::set_milestone))

        .route("/{owner}/{name}/issue/{number}/subscribe", post(issues::subscribe))

        .route("/{owner}/{name}/labels", get(issues::labels).post(issues::save_label))

        .route("/{owner}/{name}/milestones", get(issues::milestones).post(issues::save_milestone))

        .route("/{owner}/{name}/oxy/v1/{endpoint}", any(crate::protocol::dispatch).layer(DefaultBodyLimit::max(push_limit)))

        .fallback(not_found)

        .layer(axum::middleware::from_fn_with_state(app.clone(), same_origin))

        .layer(CompressionLayer::new())

        .layer(TraceLayer::new_for_http())

        .with_state(app)

}

// Git's smart HTTP paths under `/{owner}/{name}.git/`, forwarded to the

// mirror (hub spec §14).

async fn git_info(

    st: axum::extract::State<Shared>,

    axum::extract::Path((o, n, rest)): axum::extract::Path<(String, String, String)>,

    m: axum::http::Method,

    q: axum::extract::RawQuery,

    h: axum::http::HeaderMap,

    b: axum::body::Bytes,

) -> Response {

    crate::mirror::serve(st, axum::extract::Path((o, n, format!("info/{rest}"))), m, q, h, b).await

}

async fn git_head(

    st: axum::extract::State<Shared>,

    axum::extract::Path((o, n)): axum::extract::Path<(String, String)>,

    m: axum::http::Method,

    q: axum::extract::RawQuery,

    h: axum::http::HeaderMap,

    b: axum::body::Bytes,

) -> Response {

    crate::mirror::serve(st, axum::extract::Path((o, n, "HEAD".into())), m, q, h, b).await

}

async fn git_objects(

    st: axum::extract::State<Shared>,

    axum::extract::Path((o, n, rest)): axum::extract::Path<(String, String, String)>,

    m: axum::http::Method,

    q: axum::extract::RawQuery,

    h: axum::http::HeaderMap,

    b: axum::body::Bytes,

) -> Response {

    crate::mirror::serve(st, axum::extract::Path((o, n, format!("objects/{rest}"))), m, q, h, b).await

}

async fn git_upload_pack(

    st: axum::extract::State<Shared>,

    axum::extract::Path((o, n)): axum::extract::Path<(String, String)>,

    m: axum::http::Method,

    q: axum::extract::RawQuery,

    h: axum::http::HeaderMap,

    b: axum::body::Bytes,

) -> Response {

    crate::mirror::serve(st, axum::extract::Path((o, n, "git-upload-pack".into())), m, q, h, b).await

}

async fn git_receive_pack(

    st: axum::extract::State<Shared>,

    axum::extract::Path((o, n)): axum::extract::Path<(String, String)>,

    m: axum::http::Method,

    q: axum::extract::RawQuery,

    h: axum::http::HeaderMap,

    b: axum::body::Bytes,

) -> Response {

    crate::mirror::serve(st, axum::extract::Path((o, n, "git-receive-pack".into())), m, q, h, b).await

}

/// Cross-site form posts are refused (hub spec §15.2): a browser that

/// sends `Origin` or `Sec-Fetch-Site` must name this site. Protocol and

/// API clients send neither.

async fn same_origin(

    axum::extract::State(app): axum::extract::State<Shared>,

    req: axum::extract::Request,

    next: axum::middleware::Next,

) -> Response {

    if req.method() != axum::http::Method::GET && req.method() != axum::http::Method::HEAD {

        let headers = req.headers();

        if headers.get("sec-fetch-site").and_then(|v| v.to_str().ok()) == Some("cross-site") {

            return (StatusCode::FORBIDDEN, "cross-site request refused").into_response();

        }

        if let Some(origin) = headers.get(header::ORIGIN).and_then(|v| v.to_str().ok()) {

            let host_of = |u: &str| u.split("://").nth(1).unwrap_or(u).split('/').next().unwrap_or("").to_ascii_lowercase();

            let request_host = headers.get(header::HOST).and_then(|v| v.to_str().ok()).map(|h| h.to_ascii_lowercase());

            let ok = host_of(origin) == host_of(app.config.base_url()) || request_host.as_deref() == Some(host_of(origin).as_str());

            if !ok && origin != "null" {

                return (StatusCode::FORBIDDEN, "cross-site request refused").into_response();

            }

        }

    }

    next.run(req).await

}

/// What every page's chrome needs.

#[derive(Clone, Debug)]

pub struct Shell {

    pub site: String,

    pub base_url: String,

    pub path: String,

    pub version: &'static str,

    /// The signed-in username, if any.

    pub user: Option<String>,

    pub is_admin: bool,

    pub csrf: String,

    pub unread: i64,

}

impl Shell {

    pub fn new(app: &Shared, path: &str, viewer: &Viewer) -> Shell {

        Shell {

            site: app.config.site.name.clone(),

            base_url: app.config.base_url().to_string(),

            path: path.to_string(),

            version: env!("CARGO_PKG_VERSION"),

            user: viewer.account().map(|a| a.username.clone()),

            is_admin: viewer.is_admin(),

            csrf: viewer.csrf().to_string(),

            unread: viewer.0.as_ref().map(|v| v.unread).unwrap_or(0),

        }

    }

    pub fn anonymous(app: &Shared, path: &str) -> Shell {

        Shell::new(app, path, &Viewer(None))

    }

}

/// The repository chrome: tabs and counts.

#[derive(Clone, Debug)]

pub struct RepoShell {

    pub owner: String,

    pub name: String,

    pub url: String,

    pub description: String,

    pub default_bookmark: String,

    pub visibility: String,

    pub tab: &'static str,

    pub clone_url: String,

    /// The viewer's role, for showing settings and write actions.

    pub role: Option<Role>,

    /// Open issues and proposals, shown on their tabs.

    pub open_issues: i64,

    pub open_proposals: i64,

}

impl RepoShell {

    pub fn new(app: &Shared, row: &db::repos::RepoRow, tab: &'static str) -> RepoShell {

        RepoShell {

            owner: row.owner.clone(),

            name: row.name.clone(),

            url: format!("/{}/{}", row.owner, row.name),

            description: row.description.clone(),

            default_bookmark: row.default_bookmark.clone(),

            visibility: row.visibility.clone(),

            tab,

            clone_url: format!("{}/{}/{}", app.config.base_url(), row.owner, row.name),

            role: None,

            open_issues: row.open_issues,

            open_proposals: row.open_proposals,

        }

    }

    pub fn with_role(mut self, role: Role) -> RepoShell {

        self.role = Some(role);

        self

    }

    pub fn can(&self, access: Access) -> bool {

        auth::roles::allows(self.role, access)

    }

    pub fn can_maintain(&self) -> bool {

        self.can(Access::Maintain)

    }

}

/// Render a template as an HTML response.

/// One page of a long list: which page, how many, and links that keep

/// the rest of the query.

#[derive(Clone, Debug)]

pub struct Pager {

    pub page: usize,

    pub pages: usize,

    pub total: usize,

    /// The query without `page`, each pair encoded, joined with `&`.

    query: String,

}

impl Pager {

    pub const PER_PAGE: usize = 25;

    /// `page` counts from 1; out-of-range pages clamp to the last.

    pub fn new(total: usize, page: Option<usize>, query: &[(&str, &str)]) -> Pager {

        let pages = total.div_ceil(Self::PER_PAGE).max(1);

        let page = page.unwrap_or(1).clamp(1, pages);

        let query = query

            .iter()

            .filter(|(_, v)| !v.is_empty())

            .map(|(k, v)| format!("{k}={}", settings::urlencode(v).replace('/', "%2F")))

            .collect::<Vec<_>>()

            .join("&");

        Pager { page, pages, total, query }

    }

    /// This page's items.

    pub fn slice<T>(&self, all: Vec<T>) -> Vec<T> {

        all.into_iter().skip((self.page - 1) * Self::PER_PAGE).take(Self::PER_PAGE).collect()

    }

    pub fn url(&self, page: usize) -> String {

        if self.query.is_empty() {

            format!("?page={page}")

        } else {

            format!("?{}&page={page}", self.query)

        }

    }

    /// The same query with another sort, back on page one.

    pub fn sorted(&self, sort: &str) -> String {

        let rest: Vec<&str> = self.query.split('&').filter(|p| !p.is_empty() && !p.starts_with("sort=")).collect();

        let mut q = rest.join("&");

        if !q.is_empty() {

            q.push('&');

        }

        format!("?{q}sort={sort}")

    }

}

pub struct Page<T: Template>(pub T);

impl<T: Template> IntoResponse for Page<T> {

    fn into_response(self) -> Response {

        match self.0.render() {

            Ok(s) => Html(s).into_response(),

            Err(e) => {

                tracing::error!("template: {e}");

                (StatusCode::INTERNAL_SERVER_ERROR, "template error").into_response()

            }

        }

    }

}

#[derive(Template)]

#[template(path = "error.html")]

struct ErrorPage {

    shell: Shell,

    status: u16,

    title: String,

    detail: String,

}

/// A page-level failure, rendered inside the shell, or a redirect.

#[derive(Debug)]

pub struct Error {

    pub status: StatusCode,

    pub detail: String,

    shell: Option<Box<Shell>>,

    redirect: Option<String>,

}

impl Error {

    pub fn redirect(to: String) -> Error {

        Error { status: StatusCode::SEE_OTHER, detail: String::new(), shell: None, redirect: Some(to) }

    }

    pub fn not_found(shell: Shell) -> Error {

        Error {

            status: StatusCode::NOT_FOUND,

            detail: "There is nothing at this address.".into(),

            shell: Some(Box::new(shell)),

            redirect: None,

        }

    }

    pub fn bad(shell: Shell, detail: impl Into<String>) -> Error {

        Error { status: StatusCode::BAD_REQUEST, detail: detail.into(), shell: Some(Box::new(shell)), redirect: None }

    }

    pub fn from_repo(shell: Shell, e: RepoError) -> Error {