Implement the password change form

crates/handlers/src/lib.rs

@@ -389,6 +389,10 @@ where
             mas_router::AccountRecoveryProgress::route(),
             get(self::views::recovery::progress::get).post(self::views::recovery::progress::post),
         )
+        .route(
+            mas_router::AccountRecoveryFinish::route(),
+            get(self::views::recovery::finish::get).post(self::views::recovery::finish::post),
+        )
         .route(
             mas_router::OAuth2AuthorizationEndpoint::route(),
             get(self::oauth2::authorization::get),

crates/handlers/src/views/recovery/finish.rs

@@ -0,0 +1,246 @@
+// Copyright 2024 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use anyhow::Context;
+use axum::{
+    extract::{Query, State},
+    response::{Html, IntoResponse, Response},
+    Form,
+};
+use mas_axum_utils::{
+    cookies::CookieJar,
+    csrf::{CsrfExt, ProtectedForm},
+    FancyError,
+};
+use mas_policy::Policy;
+use mas_router::UrlBuilder;
+use mas_storage::{BoxClock, BoxRepository, BoxRng};
+use mas_templates::{
+    ErrorContext, FieldError, FormState, RecoveryFinishContext, RecoveryFinishFormField,
+    TemplateContext, Templates,
+};
+use serde::{Deserialize, Serialize};
+use zeroize::Zeroizing;
+
+use crate::{passwords::PasswordManager, PreferredLanguage};
+
+#[derive(Deserialize)]
+pub(crate) struct RouteQuery {
+    ticket: String,
+}
+
+#[derive(Deserialize, Serialize)]
+pub(crate) struct RouteForm {
+    new_password: String,
+    new_password_confirm: String,
+}
+
+pub(crate) async fn get(
+    mut rng: BoxRng,
+    clock: BoxClock,
+    mut repo: BoxRepository,
+    State(templates): State<Templates>,
+    PreferredLanguage(locale): PreferredLanguage,
+    cookie_jar: CookieJar,
+    Query(query): Query<RouteQuery>,
+) -> Result<Response, FancyError> {
+    let (csrf_token, cookie_jar) = cookie_jar.csrf_token(&clock, &mut rng);
+
+    let ticket = repo
+        .user_recovery()
+        .find_ticket(&query.ticket)
+        .await?
+        .context("Unknown ticket")?;
+
+    let session = repo
+        .user_recovery()
+        .lookup_session(ticket.user_recovery_session_id)
+        .await?
+        .context("Unknown session")?;
+
+    if !ticket.active(clock.now()) || session.consumed_at.is_some() {
+        // TODO: render a 'link expired' page
+        let rendered = templates.render_error(
+            &ErrorContext::new()
+                .with_code("Link expired")
+                .with_language(&locale),
+        )?;
+        return Ok((cookie_jar, Html(rendered)).into_response());
+    }
+
+    let user_email = repo
+        .user_email()
+        .lookup(ticket.user_email_id)
+        .await?
+        // Only allow confirmed email addresses
+        .filter(|email| email.confirmed_at.is_some())
+        .context("Unknown email address")?;
+
+    let user = repo
+        .user()
+        .lookup(user_email.user_id)
+        .await?
+        .context("Invalid user")?;
+
+    if !user.is_valid() {
+        // TODO: render a 'account locked' page
+        let rendered = templates.render_error(
+            &ErrorContext::new()
+                .with_code("Account locked")
+                .with_language(&locale),
+        )?;
+        return Ok((cookie_jar, Html(rendered)).into_response());
+    }
+
+    let context = RecoveryFinishContext::new(user)
+        .with_csrf(csrf_token.form_value())
+        .with_language(locale);
+
+    let rendered = templates.render_recovery_finish(&context)?;
+
+    Ok((cookie_jar, Html(rendered)).into_response())
+}
+
+pub(crate) async fn post(
+    mut rng: BoxRng,
+    clock: BoxClock,
+    mut repo: BoxRepository,
+    mut policy: Policy,
+    State(password_manager): State<PasswordManager>,
+    State(templates): State<Templates>,
+    State(url_builder): State<UrlBuilder>,
+    PreferredLanguage(locale): PreferredLanguage,
+    cookie_jar: CookieJar,
+    Query(query): Query<RouteQuery>,
+    Form(form): Form<ProtectedForm<RouteForm>>,
+) -> Result<Response, FancyError> {
+    let (csrf_token, cookie_jar) = cookie_jar.csrf_token(&clock, &mut rng);
+
+    let ticket = repo
+        .user_recovery()
+        .find_ticket(&query.ticket)
+        .await?
+        .context("Unknown ticket")?;
+
+    let session = repo
+        .user_recovery()
+        .lookup_session(ticket.user_recovery_session_id)
+        .await?
+        .context("Unknown session")?;
+
+    if !ticket.active(clock.now()) || session.consumed_at.is_some() {
+        // TODO: render a 'link expired' page
+        let rendered = templates.render_error(
+            &ErrorContext::new()
+                .with_code("Link expired")
+                .with_language(&locale),
+        )?;
+        return Ok((cookie_jar, Html(rendered)).into_response());
+    }
+
+    let user_email = repo
+        .user_email()
+        .lookup(ticket.user_email_id)
+        .await?
+        // Only allow confirmed email addresses
+        .filter(|email| email.confirmed_at.is_some())
+        .context("Unknown email address")?;
+
+    let user = repo
+        .user()
+        .lookup(user_email.user_id)
+        .await?
+        .context("Invalid user")?;
+
+    if !user.is_valid() {
+        // TODO: render a 'account locked' page
+        let rendered = templates.render_error(
+            &ErrorContext::new()
+                .with_code("Account locked")
+                .with_language(&locale),
+        )?;
+        return Ok((cookie_jar, Html(rendered)).into_response());
+    }
+
+    let form = cookie_jar.verify_form(&clock, form)?;
+
+    // Check the form
+    let mut form_state = FormState::from_form(&form);
+
+    if form.new_password.is_empty() {
+        form_state = form_state
+            .with_error_on_field(RecoveryFinishFormField::NewPassword, FieldError::Required);
+    }
+
+    if form.new_password_confirm.is_empty() {
+        form_state = form_state.with_error_on_field(
+            RecoveryFinishFormField::NewPasswordConfirm,
+            FieldError::Required,
+        );
+    }
+
+    if form.new_password != form.new_password_confirm {
+        form_state = form_state
+            .with_error_on_field(
+                RecoveryFinishFormField::NewPassword,
+                FieldError::Unspecified,
+            )
+            .with_error_on_field(
+                RecoveryFinishFormField::NewPasswordConfirm,
+                FieldError::PasswordMismatch,
+            );
+    }
+
+    let res = policy.evaluate_password(&form.new_password).await?;
+
+    if !res.valid() {
+        form_state = form_state.with_error_on_field(
+            RecoveryFinishFormField::NewPassword,
+            FieldError::Policy {
+                message: res.to_string(),
+            },
+        );
+    }
+
+    if !form_state.is_valid() {
+        let context = RecoveryFinishContext::new(user)
+            .with_form_state(form_state)
+            .with_csrf(csrf_token.form_value())
+            .with_language(locale);
+
+        let rendered = templates.render_recovery_finish(&context)?;
+
+        return Ok((cookie_jar, Html(rendered)).into_response());
+    }
+
+    // Form is valid, change the password
+    let password = Zeroizing::new(form.new_password.into_bytes());
+    let (version, hashed_password) = password_manager.hash(&mut rng, password).await?;
+    repo.user_password()
+        .add(&mut rng, &clock, &user, version, hashed_password, None)
+        .await?;
+
+    // Mark the session as consumed
+    repo.user_recovery()
+        .consume_ticket(&clock, ticket, session)
+        .await?;
+
+    repo.save().await?;
+
+    Ok((
+        cookie_jar,
+        url_builder.redirect(&mas_router::Login::default()),
+    )
+        .into_response())
+}

crates/handlers/src/views/recovery/mod.rs

@@ -12,5 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+pub mod finish;
 pub mod progress;
 pub mod start;

crates/handlers/src/views/register.rs

@@ -191,9 +191,11 @@ pub(crate) async fn post(
         }
 
         if form.password != form.password_confirm {
-            state.add_error_on_form(FormError::PasswordMismatch);
             state.add_error_on_field(RegisterFormField::Password, FieldError::Unspecified);
-            state.add_error_on_field(RegisterFormField::PasswordConfirm, FieldError::Unspecified);
+            state.add_error_on_field(
+                RegisterFormField::PasswordConfirm,
+                FieldError::PasswordMismatch,
+            );
         }
 
         // If the site has terms of service, the user must accept them

crates/templates/src/context.rs

@@ -1056,6 +1056,76 @@ impl TemplateContext for RecoveryProgressContext {
     }
 }
 
+/// Fields of the account recovery finish form
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, Hash, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
+pub enum RecoveryFinishFormField {
+    /// The new password
+    NewPassword,
+
+    /// The new password confirmation
+    NewPasswordConfirm,
+}
+
+impl FormField for RecoveryFinishFormField {
+    fn keep(&self) -> bool {
+        false
+    }
+}
+
+/// Context used by the `pages/recovery/finish.html` template
+#[derive(Serialize)]
+pub struct RecoveryFinishContext {
+    user: User,
+    form: FormState<RecoveryFinishFormField>,
+}
+
+impl RecoveryFinishContext {
+    /// Constructs a context for the recovery finish page
+    #[must_use]
+    pub fn new(user: User) -> Self {
+        Self {
+            user,
+            form: FormState::default(),
+        }
+    }
+
+    /// Set the form state
+    #[must_use]
+    pub fn with_form_state(mut self, form: FormState<RecoveryFinishFormField>) -> Self {
+        self.form = form;
+        self
+    }
+}
+
+impl TemplateContext for RecoveryFinishContext {
+    fn sample(now: chrono::DateTime<Utc>, rng: &mut impl Rng) -> Vec<Self>
+    where
+        Self: Sized,
+    {
+        User::samples(now, rng)
+            .into_iter()
+            .flat_map(|user| {
+                vec![
+                    Self::new(user.clone()),
+                    Self::new(user.clone()).with_form_state(
+                        FormState::default().with_error_on_field(
+                            RecoveryFinishFormField::NewPassword,
+                            FieldError::Invalid,
+                        ),
+                    ),
+                    Self::new(user.clone()).with_form_state(
+                        FormState::default().with_error_on_field(
+                            RecoveryFinishFormField::NewPasswordConfirm,
+                            FieldError::Invalid,
+                        ),
+                    ),
+                ]
+            })
+            .collect()
+    }
+}
+
 /// Context used by the `pages/upstream_oauth2/{link_mismatch,do_login}.html`
 /// templates
 #[derive(Serialize)]

crates/templates/src/forms.rs

@@ -36,6 +36,9 @@ pub enum FieldError {
     /// Invalid value for this field
     Invalid,
 
+    /// The password confirmation doesn't match the password
+    PasswordMismatch,
+
     /// That value already exists
     Exists,
 

crates/templates/src/lib.rs

@@ -46,11 +46,12 @@ pub use self::{
         DeviceLinkFormField, EmailAddContext, EmailRecoveryContext, EmailVerificationContext,
         EmailVerificationPageContext, EmptyContext, ErrorContext, FormPostContext, IndexContext,
         LoginContext, LoginFormField, NotFoundContext, PolicyViolationContext, PostAuthContext,
-        PostAuthContextInner, ReauthContext, ReauthFormField, RecoveryProgressContext,
-        RecoveryStartContext, RecoveryStartFormField, RegisterContext, RegisterFormField,
-        SiteBranding, SiteConfigExt, SiteFeatures, TemplateContext, UpstreamExistingLinkContext,
-        UpstreamRegister, UpstreamRegisterFormField, UpstreamSuggestLink, WithCaptcha, WithCsrf,
-        WithLanguage, WithOptionalSession, WithSession,
+        PostAuthContextInner, ReauthContext, ReauthFormField, RecoveryFinishContext,
+        RecoveryFinishFormField, RecoveryProgressContext, RecoveryStartContext,
+        RecoveryStartFormField, RegisterContext, RegisterFormField, SiteBranding, SiteConfigExt,
+        SiteFeatures, TemplateContext, UpstreamExistingLinkContext, UpstreamRegister,
+        UpstreamRegisterFormField, UpstreamSuggestLink, WithCaptcha, WithCsrf, WithLanguage,
+        WithOptionalSession, WithSession,
     },
     forms::{FieldError, FormError, FormField, FormState, ToFormState},
 };
@@ -353,6 +354,8 @@ register_templates! {
     /// Render the account recovery start page
     pub fn render_recovery_progress(WithLanguage<WithCsrf<RecoveryProgressContext>>) { "pages/recovery/progress.html" }
 
+    /// Render the account recovery finish page
+    pub fn render_recovery_finish(WithLanguage<WithCsrf<RecoveryFinishContext>>) { "pages/recovery/finish.html" }
 
     /// Render the re-authentication form
     pub fn render_reauth(WithLanguage<WithCsrf<WithSession<ReauthContext>>>) { "pages/reauth.html" }
@@ -421,6 +424,7 @@ impl Templates {
         check::render_account_verify_email(self, now, rng)?;
         check::render_recovery_start(self, now, rng)?;
         check::render_recovery_progress(self, now, rng)?;
+        check::render_recovery_finish(self, now, rng)?;
         check::render_reauth(self, now, rng)?;
         check::render_form_post::<EmptyContext>(self, now, rng)?;
         check::render_error(self, now, rng)?;