constitution · epochs · watch · epoch 3

comparison

c_97611919bf0b (tommy-mor) vs c_afa638171cf7 (tommy-mor)

download prompt · raw event · cmp_fd1e5508997088

council reasoning

~anthropic/claude-sonnet-latest · winner B · 55:45 · permalink

Side B ships a real feature (Reddit OAuth linking, UUID-centric identity, private linked-provider display, session/link-conflict handling) with corresponding server, test-harness, and mock-server updates, delivering concrete new user-facing capability. Side A is a large but purely mechanical rename/refactor (CanonicalItemUrl -> ItemId) that preserves existing behavior and even deletes its own planning doc, providing structural cleanup but no new functionality or bugfix of comparable weight.

~x-ai/grok-latest · winner A · 3:2 · permalink

Commit A lands a core domain redesign: a real ItemId type (Root/Local/Web/Opaque), split wire normalization (item_wire), and end-to-end replacement of CanonicalItemUrl across reducer maps, ranking, RPC, HTML routing, and tests—foundational structure used everywhere items are keyed. Commit B is valuable product/auth work (Reddit OAuth, multi-provider link-to-UUID, private linked-provider UI, pending trust weights in projection batches) but is narrower in blast radius than rewriting item identity through the graph.

openai/gpt-chat-latest · winner A · 3:2 · permalink

Side A introduces a new `ItemId` type with parsing, serialization, parent/display logic, extracts wire-normalization into `item_wire.rs`, and propagates the new identity model throughout reducers, ranking, routing, HTML, and tests, replacing `CanonicalItemUrl` across the project. Side B adds valuable Reddit OAuth support and a UUID-centric account-linking flow with provider linking and trust-weight updates, but it is a feature-focused authentication enhancement rather than the broad foundational identity and API refactor in Side A.

sides

A — c_97611919bf0b (tommy-mor)

message

[3b3d5873] item refactor

diff preview

diff --git a/plan.md b/plan.md
deleted file mode 100644
index 00d6867a1e0ed144a16a020ea037f685ce646c73..0000000000000000000000000000000000000000
--- a/plan.md
+++ /dev/null
@@ -1,155 +0,0 @@
-# Plan: `ItemId` + `RouteContext` (identity vs hrefs)
-
-This document is for **the next agent** to continue the refactor without re-deriving context from chat. It supersedes ad-hoc notes: treat it as the checklist of record until the work lands and this file is deleted or trimmed.
-
-## Goal
-
-- **Identity** (what lives in the reducer graph, votes, indexes) becomes a **structural `ItemId` enum** in `slug-types`, not a canonical `String` / `CanonicalItemUrl` newtype.
-- **Presentation** (tilde / dash display, breadcrumbs) derives from `ItemId` via explicit methods, not string stripping.
-- **Routing** (browser `href`s for public vs room) goes through **`RouteContext`** (started in `server/src/html/routing.rs`) so Maud/handlers do not stitch `/r/…` vs `/~` ad hoc.
-
-**Non-goals for v1 of the migration:** backward-compatible JSONL or dual-read of old canonical strings in the event log (project has accepted breaking changes). If you reintroduce compat, document it here.
-
-## Current state (as of this plan)
-
-- **`CanonicalItemUrl`** (`types/src/paths.rs`): newtype around `String`; `parse` / `parent` / `display_path` / `tilde_tail` / etc. Reducer `ContentState`, `VoteData`, ranking, RPC, search, garden, breadcrumbs all use it or `String` keys derived from it.
-- **`ThreadNav`** (`server/src/html/forum/nav.rs`): encodes scope prefixes for threads and garden URLs; **`RouteContext`** now wraps `ThreadNav` (`server/src/html/routing.rs`, re-exported from `server/src/html/mod.rs`) but **most HTML still takes `&ThreadNav` directly** — migration incomplete.
-- **URL normalization** lives in `types/src/url_normalize.rs` + `canonicalize_item` / `finalize_external_identity_url` in `paths.rs` (YouTube, sorted query params, room path `room_route_segment` in `paths.rs`).
-- **Room HTTP paths** are `/r/{short}{slug}` (fused segment); wire **`room_id`** remains `short/slug` for RPC/events.
-
-## Target architecture
-
-### `ItemId` (types)
-
-Suggested shape (adjust after profiling `Ord` / `Hash` / serde size):
-
-```text
-ItemId::Root                      — tilde ontology root (today `SLUG_TILDE_ONTOLOGY_ROOT`)
-ItemId::Local { segments }        — slug.social ~/… path as Vec<String> (lowercase segments, non-empty for non-root)
-ItemId::External { url: Url }    — normalized `url::Url` (crate `url` already in `slug-types`)
-```
-
-**API surface (minimum):**
-
-- `ItemId::parse(&str) -> Option<ItemId>` — single entry from DSL / user input / legacy wire (internally may call `canonicalize_item` + structured split).
-- `ItemId::to_wire_url(&self) -> String` — only for **external** boundaries if needed (HTTP fetch, rare assertions); avoid using as the primary key once maps use `ItemId`.
-- `parent`, `display_path`, `tilde_tail` / `tilde_http_tail`, `tilde_segments`, `last_segment`, `normalized_storage` — port from `CanonicalItemUrl`.
-- **`Ord` + `Hash` + `Eq`** stable for `BTreeSet` / `HashMap` (see `write_actor` scope-rank snapshots).
-- **`Serialize` / `Deserialize`** — decide **tagged JSON** for any persisted or API-carried structs (e.g. `VoteData` in tests). If RPC must stay stringy for clients, use a **DTO layer** that converts `ItemId` ↔ wire at the boundary only.
-
-**Remove:** `CanonicalItemUrl` type and all `path_types::CanonicalItemUrl` / `slug_types::paths::CanonicalItemUrl` exports once call sites are migrated. **`Borrow<str>`** on the old newtype goes away; update `nav!` / any code that assumed map keys borrowed as `str`.
-
-### `RouteContext` (server HTML)
-
-- **File:** `server/src/html/routing.rs` — **`RouteContext(ThreadNav)`** with `item_href`, `item_href_raw`, `thread_url`, `garden_root_url`, `room_url`, `From`/`Into` `ThreadNav`.
-- **Direction:** new code and refactored Maud should take **`&RouteContext`** (or owned where appropriate) instead of `&ThreadNav` when building links. Long term, **`item_href(&ItemId)`** should not parse strings — it should pattern-match `ItemId` and append tilde tail or `/-/…` external tail using the same rules as today’s `ThreadNav::garden_item_url`.
-
-### Axum / garden routes
-
-- **No** single catch-all route (explicit decision): keep the existing router layout in `server/src/lib.rs`.
-- Room routes stay **`/r/:room_key/...`** with `room_key` fused; parsing via `slug_types::room_id_from_route_segment` / `room_route_segment` in `paths.rs`.
-
-## Phased execution (recommended order)
-
-### Phase 0 — Preconditions (quick)
-
-1. Read **`AGENTS.md`** (UI contract, durability matrix, `RpcCommand` vs `HtmlUiAction`).
-2. Run **`cargo test --workspace`** and **`./scripts/clj-test.sh`** on clean `main` before large diffs; repeat after each phase.
-
-### Phase 1 — `ItemId` in `slug-types` (no server yet)
-
-1. Add **`ItemId`** (new file e.g. `types/src/item_id.rs` **or** inline at bottom of `paths.rs` — see **Module cycle** below).
-2. Implement **`ItemId::parse`** using existing **`canonicalize_item`** + normalization; port **`CanonicalItemUrl`** methods to **`ItemId`** with tests ported from `paths.rs` `#[cfg(test)] mod tests`.
-3. **`GardenItemUrl::from_stored(&ItemId, room_wire)`** (and thread helpers) — build absolute hrefs from structure, not from re-parsing a canonical string.
-4. **`TildeHttpPathTail::to_item_id`** (rename from `to_canonical`) / **`tilde_http_path_to_item_id`**.
-5. **`TildeOntologyPath::from_stored(&ItemId)`**.
-6. Export **`ItemId`** from **`types/src/lib.rs`**; update **`server/src/path_types.rs`** re-exports.
-7. **Delete `CanonicalItemUrl`** and fix all **in-crate** references in `types` only until `cargo test` passes for `slug-types`.
-
-**Module cycle trap:** `item_id.rs` must not `use crate::paths::{...}` if `paths.rs` also imports `ItemId` for `GardenItemUrl` in the same module. **Fix one of:**
-
-- **A)** Put `ItemId` **inside `paths.rs`** below `canonicalize_item` / helpers (simplest, large file), or  
-- **B)** Split **`canonicalize_item`** (+ dash host helpers + `finalize_external_identity_url`) into **`types/src/item_wire.rs`**, then `paths.rs` + `item_id.rs` both depend on `item_wire` only (cleaner, more files).
-
-### Phase 2 — Reducer + ranking (server core)
-
-1. **`server/src/reducer.rs`**: `ContentState` / `GroupState` / **`VoteData`** — replace **`CanonicalItemUrl`** with **`ItemId`** on all maps, sets, deques, vectors.
-2. **`apply_vote`**: normalize `a`/`b` via **`ItemId::parse`** or **`ItemId`**-aware logic (remove string round-trip).
-3. **`apply_ingest_to_content`**: **`dsl`** still yields strings for item titles in statements; normalize to **`ItemId`** at ingest boundary via **`ItemId::parse`** once per item.
-4. **`server/src/ranking.rs`**, **`server/src/scope_rank.rs`**, **`server/src/api/write_actor.rs`** (including **`BTreeSet`** ordering), **`server/src/api/validate.rs`**, **`server/src/api/helpers.rs`** — propagate **`ItemId`**.
-5. **`server/tests/basic.rs`** and any reducer tests constructing **`VoteData`** — use **`ItemId::parse(...).unwrap()`** or helpers.
-
-### Phase 3 — RPC + search + external resolver
-
-1. **`server/src/api/rpc.rs`**: rank/pair/matchup/search payloads; today many paths use **`GardenItemUrl::from_storage_str(item.as_str(), …)`** — switch to **`ItemId`** + **`GardenItemUrl::from_stored(&item_id, …)`** (or equivalent).
-2. **`server/src/html/search.rs`**: scoring uses item path strings — derive from **`ItemId::display_path`** / **`to_wire_url`** only at the scoring boundary if needed.
-3. **`server/src/external_resolver.rs`**: take **`&ItemId`** or **`ItemId::external_url()`** instead of **`&CanonicalItemUrl`**.
-
-### Phase 4 — HTML / Maud
-
-1. **`ThreadNav::garden_item_url`**: overload or replace with **`garden_item_href(&self, item: &ItemId)`** (no `CanonicalItemUrl::parse` inside).
-2. **`RouteContext`**: extend **`item_href(&ItemId)`**; migrate call sites from **`ThreadNav`** to **`RouteContext`** where only link-building is needed (keep **`ThreadNav`** where scope / auth helpers need the full struct).
-3. **`server/src/html/garden.rs`**, **`breadcrumb_path.rs`**, **`forum/*`**, **`editor.rs`**: replace **`CanonicalItemUrl`** with **`ItemId`**; breadcrumbs should walk **`ItemId::parent`** without string `rsplit`.
-4. **`types` JSON types** (`RankRow`, etc.): decide whether **`GardenItemUrl`** stays string for JSON or becomes a structured field; keep **one** wire format for the public API.
-
-### Phase 5 — Cleanup + docs
-
-1. Remove dead **`canonical_path`** / **`breadcrumb_path`** string logic if fully superseded.
-2. Update **`AGENTS.md`** if durability, `POST /ui`, or command surfaces change.
-3. Delete or shrink **`plan.md`** when done.
-
-## File / symbol checklist (non-exhaustive — grep-driven)
-
-Run periodically:
-
-```bash
-rg "CanonicalItemUrl" -g'*.rs'
-rg "path_types::CanonicalItemUrl" -g'*.rs'
-rg "tilde_http_path_to_canonical" -g'*.rs'
-```
-
-**High-touch files (from prior exploration):**
-
-| Area | Files |
-|------|--------|
-| Types | `types/src/paths.rs`, `types/src/lib.rs`, `types/src/url_normalize.rs`, (optional) `types/src/item_id.rs`, `types/src/item_wire.rs` |
-| Server re-exports | `server/src/path_types.rs`, `server/src/canonical_path.rs` |
-| Reducer / ingest | `server/src/reducer.rs`, `server/src/dsl.rs` (parse output types if changed) |
-| Ranking | `server/src/ranking.rs`, `server/src/scope_rank.rs` |
-| Writer / RPC | `server/src/api/write_actor.rs`, `server/src/api/rpc.rs`, `server/src/api/helpers.rs`, `server/src/api/validate.rs` |
-| HTML | `server/src/html/garden.rs`, `server/src/html/breadcrumb_path.rs`, `server/src/html/forum/nav.rs`, `server/src/html/routing.rs`, `server/src/html/search.rs`, `server/src/html/editor.rs`, `server/src/html/forum/ingest.rs`, … |
-| Tests | `server/tests/basic.rs`, `server/tests/integration.rs`, `types/src/paths.rs` tests, Clojure under `test/` if URLs/assertions mention canonical shapes |
-
-## Events / JSONL
-
-- **`Ingest`** events store **`raw` DSL** only — no change required for item identity inside the event.
-- If any future event type stores item ids as strings, migrate to **structured `ItemId` serde** or accept string only at the event boundary with immediate parse into **`ItemId`** on `apply_event`.
-
-## `nav!` macro (`server/src/paths.rs`)
-
-- Macros use **`keypath($key)`** with **`.clone()`** — **`ItemId`** must be **`Clone`** (already for enums). Remove any reliance on **`Borrow<str>`** for map keys.
-
-## Testing gate
-
-After each phase:
-
-```bash
-cargo test --workspace
-./scripts/clj-test.sh
-```
-
-## Risks / gotchas
-
-1. **`Ord` on `ItemId`**: must match prior **`CanonicalItemUrl`** / `String` ordering wherever **`BTreeSet`** is used (e.g. deterministic scope-rank snapshots in **`write_actor`**).
-2. **External `ItemId`**: **`Url`** equality / hashing — normalization is already centralized in **`url_normalize`**; ensure **`ItemId::parse`** always inserts normalized **`Url`** into **`External`**.
-3. **Fake parent URLs** in garden (e.g. **`https://.`** for external root ranking): find all **`parse("https://.")`** style hacks and express as **`ItemId`** or a dedicated sentinel.
-4. **Serde**: tests and any RPC clients that snapshot JSON may need expectation updates if **`VoteData`** shape changes.
-
-## Optional follow-ups (not blocking `ItemId`)
-
-- More **domain normalizers** in **`url_normalize.rs`** (e.g. `music.youtube.com`, Spotify, etc.).
-- **Room wire** vs **HTTP segment** helpers already in **`paths.rs`** (`ROOM_SHORT_ID_LEN`, `room_route_segment`, `room_id_from_route_segment`).
-
----
-
-**End state criteria:** `rg CanonicalItemUrl` returns nothing; reducer maps use **`ItemId`**; HTML link generation for items goes through **`RouteContext` + `ItemId`**; tests and Kaocha green.
diff --git a/server/src/api/helpers.rs b/server/src/api/helpers.rs
index 1b291db83df7364a026f2e147e0a2

… preview truncated; 100,301 characters omitted

download full diff A

B — c_afa638171cf7 (tommy-mor)

message

[52f5c51c] Add Reddit OAuth linking and make UUID the only account identity.

OAuth providers only attach to a session UUID (first link creates the
principal); linked providers stay private on the account page.

Co-authored-by: Cursor <cursoragent@cursor.com>

diff preview

diff --git a/AGENTS.md b/AGENTS.md
index 6e0fd8ebb65d665c9c1438e3275971d62b98fd95..e9cc3173dbeb21ad0fc090ca7b407b027c7820a9 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -35,8 +35,11 @@ Environment variables (defaults in `server/src/state.rs`):
 - `SORTER2_DATA_DIR` — default `./data` (created on startup)
 - `SORTER2_EVENT_LOG` — default `{data_dir}/events.jsonl`
 - `SORTER2_BASE_URL` — public origin (also drives Secure cookies when `https://`)
-- `GITHUB_CLIENT_ID` / `GITHUB_CLIENT_SECRET` — GitHub OAuth (optional; login disabled if unset)
-- `SORTER2_ALLOW_MOCK_OAUTH=1` — allow `mock_user` on `/auth/github` (tests only)
+- `GITHUB_CLIENT_ID` / `GITHUB_CLIENT_SECRET` — GitHub OAuth linking (optional)
+- `REDDIT_CLIENT_ID` / `REDDIT_CLIENT_SECRET` (or `REDDIT_APP_*`) — Reddit API import + OAuth linking (optional)
+- `SORTER2_ALLOW_MOCK_OAUTH=1` — allow `mock_user` on `/auth/github` and `/auth/reddit` (tests only)
+
+Identity: UUID is canonical. OAuth providers only *link* to a UUID (first link creates the principal). Linked providers are private to the account owner.
 
 Health check: `GET /healthz` → `ok`.
 
diff --git a/server/src/auth/mod.rs b/server/src/auth/mod.rs
index 5906f93b13853421e96a3c37bc9d8202a47842bf..c706ae8045a811e5941f5f6c72da88f42a403a82 100644
--- a/server/src/auth/mod.rs
+++ b/server/src/auth/mod.rs
@@ -1,4 +1,8 @@
-//! GitHub OAuth login, session cookies, and vote actor resolution.
+//! OAuth linking, session cookies, and vote actor resolution.
+//!
+//! Canonical identity is a UUID. OAuth providers only *link* to that UUID
+//! (first link creates the principal; later links attach while logged in).
+//! Which providers are linked is private to the account owner.
 
 pub mod config;
 pub mod identity;
@@ -22,7 +26,9 @@ use crate::{
     form_template::template_json_compact,
     html::layout,
     state::AppState,
-    storage_schema::{oauth_link_owner, pseudonym_owner, Store, StoreFields},
+    storage_schema::{
+        linked_providers_for_uuid, oauth_link_owner, pseudonym_owner, Store, StoreFields,
+    },
     ui_action::UI_RPC_FIELD,
 };
 
@@ -53,10 +59,12 @@ fn new_actor_uuid() -> String {
 pub struct LoginQuery {
     #[serde(default)]
     pub return_to: Option<String>,
+    #[serde(default)]
+    pub error: Option<String>,
 }
 
 #[derive(Debug, Deserialize)]
-pub struct GitHubStartQuery {
+pub struct OAuthStartQuery {
     #[serde(default)]
     pub return_to: Option<String>,
     #[serde(default)]
@@ -72,15 +80,22 @@ fn return_from_query_or_jar(jar: &CookieJar, query: Option<&str>) -> String {
         .unwrap_or_else(|| "/".to_string())
 }
 
-fn oauth_providers(base_url: &str, return_to: &str) -> Vec<(&'static str, String)> {
+/// Available OAuth link targets: `(provider_key, label, start_href)`.
+fn oauth_providers(base_url: &str, return_to: &str) -> Vec<(&'static str, &'static str, String)> {
     let mut out = Vec::new();
+    let enc = urlencoding::encode(return_to);
     if oauth::GitHubConfig::from_env(base_url).is_some() {
         out.push((
-            "GitHub",
-            format!(
-                "/auth/github?return_to={}",
-                urlencoding::encode(return_to)
-            ),
+            "github",
+            oauth::provider_label("github"),
+            format!("/auth/github?return_to={enc}"),
+        ));
+    }
+    if oauth::RedditConfig::from_env(base_url).is_some() {
+        out.push((
+            "reddit",
+            oauth::provider_label("reddit"),
+            format!("/auth/reddit?return_to={enc}"),
         ));
     }
     out
@@ -125,23 +140,41 @@ fn alias_claim_forms(return_to: &str, submit_label: &str) -> Result<Markup, Stat
     })
 }
 
-fn signed_out_body(providers: &[(&str, String)]) -> Markup {
+fn login_error_message(code: Option<&str>) -> Option<&'static str> {
+    match code {
+        Some("oauth_taken") => {
+            Some("that OAuth account is already linked to a different sorter2 account")
+        }
+        Some("oauth_failed") => Some("OAuth failed — try again"),
+        _ => None,
+    }
+}
+
+fn signed_out_body(
+    providers: &[(&str, &str, String)],
+    error: Option<&str>,
+) -> Markup {
     html! {
         main class="panel login-page" {
             section class="login-section" {
                 h1 { "sign in" }
-                p class="muted" { "link an account to vote under a lasting alias" }
+                p class="muted" {
+                    "link an OAuth account to create your identity, then claim an alias to vote"
+                }
+                @if let Some(msg) = login_error_message(error) {
+                    p class="alias-bad" data-testid="login-error" { (msg) }
+                }
                 @if providers.is_empty() {
                     p class="muted" {
-                        "OAuth is not configured. Set GITHUB_CLIENT_ID and GITHUB_CLIENT_SECRET."
+                        "OAuth is not configured. Set GitHub and/or Reddit client credentials."
                     }
                 } @else {
                     ul class="oauth-provider-list" {
-                        @for (name, href) in providers {
+                        @for (key, label, href) in providers {
                             li {
                                 a href=(href) class="btn-primary oauth-provider"
-                                    data-testid=(format!("oauth-{}", name.to_lowercase())) {
-                                    (format!("Continue with {name}"))
+                                    data-testid=(format!("oauth-{key}")) {
+                                    (format!("Link {label}"))
                                 }
                             }
                         }
@@ -156,7 +189,10 @@ fn signed_out_body(providers: &[(&str, String)]) -> Markup {
 fn account_body(
     actor: &session::SessionActor,
     aliases: &[String],
-    providers: &[(&str, String)],
+    // Provider keys already linked to this UUID (private).
+    linked: &[String],
+    // Providers available to link: not yet attached.
+    unlinkable: &[(&str, &str, String)],
     claim_forms: Markup,
 ) -> Markup {
     let current = actor.pseudonym.trim();
@@ -212,16 +248,29 @@ fn account_body(
                 (claim_forms)
             }
 
-            @if !providers.is_empty() {
-                section class="login-section" {
-                    h2 { "linked sign-in" }
-                    p class="muted small" { "sign in again with the same provider to return to this account" }
+            section class="login-section" {
+                h2 { "linked sign-in" }
+                p class="muted small" {
+                    "private to you — linking more providers raises trust weight without publishing which accounts you use"
+                }
+                @if linked.is_empty() {
+                    p class="muted" data-testid="linked-providers-empty" { "none yet" }
+                } @else {
+                    ul class="linked-provider-list" data-testid="linked-providers" {
+                        @for key in linked {
+                            li data-testid=(format!("linked-{key}")) {
+                                (oauth::provider_label(key))
+                            }
+                        }
+                    }
+                }
+                @if !unlinkable.is_empty() {
                     ul class="oauth-provider-list" {
-                        @for (name, href) in providers {
+                        @for (key, label, href) in unlinkable {
                             li {
                                 a href=(href) class="btn-secondary oauth-provider"
-                                    data-testid=(format!("oauth-relink-{}", name.to_lowercase())) {
-                                    (format!("Re-link {name}"))
+                                    data-testid=(format!("oauth-link-{key}")) {
+                                    (format!("Link {label}"))
                                 }
                             }
                         }
@@ -243,12 +292,21 @@ fn account_body(
 fn login_body(
     session: Option<&session::SessionActor>,
     aliases: &[String],
-    providers: &[(&str, String)],
+    linked: &[String],
+    providers: &[(&str, &str, String)],
     claim_forms: Option<Markup>,
+    error: Option<&str>,
 ) -> Markup {
     match (session, claim_forms) {
-        (Some(actor), Some(forms)) => account_body(actor, aliases, providers, forms),
-        _ => signed_out_body(providers),
+        (Some(actor), Some(forms)) => {
+            let unlinkable: Vec<_> = providers
+                .iter()
+                .filter(|(key, _, _)| !linked.iter().any(|p| p == key))
+                .cloned()
+                .collect();
+            account_body(actor, aliases, linked, &unlinkable, forms)
+        }
+        _ => signed_out_body(providers, error),
     }
 }
 
@@ -268,6 +326,10 @@ pub async fn login_page(
         .as_ref()
         .map(|s| alias_list(db, &s.uuid))
         .unwrap_or_default();
+    let linked = session
+        .as_ref()
+        .map(|s| linked_providers_for_uuid(db, &s.uuid).unwrap_or_default())
+        .unwrap_or_default();
     let providers = oauth_providers(&base_url_from_env(state.cfg.port), &return_to);
 
     let claim_forms = if session.is_some() {
@@ -282,7 +344,14 @@ pub async fn login_page(
         } else {
             "login · sorter2"
         },
-        login_body(session.as_ref(), &aliases, &providers, claim_forms),
+        login_body(
+            session.as_ref(),
+            &aliases,
+            &linked,
+            &providers,
+            claim_forms,
+            query.error.as_deref(),
+        ),
         state.views.get_views("/login"),
         session
             .as_ref()
@@ -302,7 +371,6 @@ pub async fn alias_page(
     let db = state.projection_store.db();
     let session = session::load_valid_session(db, &session_id).ok_or(StatusCode::UNAUTHORIZED)?;
     if session::session_has_pseudonym(&session) {
-        // Already onboarded — manage aliases on the account page.
         return Ok(Redirect::to("/login").into_response());
     }
 
@@ -331,7 +399,7 @@ pub async fn alias_page(
 pub async fn github_start(
     State(state): State<AppState>,
     jar: CookieJar,
-    Query(query): Query<GitHubStartQuery>,
+    Query(query): Query<OAuthStartQuery>,
 ) -> Result<Response, StatusCode> {
     let cfg = oauth::GitHubConfig::from_env(&base_url_from_env(state.cfg.port))
         .ok_or(StatusCode::SERVICE_UNAVAILABLE)?;
@@ -342,7 +410,28 @@ pub async fn github_start(
     } else {
         None
     };
-    let url = oauth::authorize_url(&cfg, &state_token, mock_user);
+    let url = oauth::github_authorize_url(&cfg, &state_token, mock_user);
+    let jar = jar
+        .add(session::oauth_state_cookie_value(&state_token))
+        .add(session::auth_return_cookie_value(&return_to));
+    Ok((jar, Redirect::temporary(&url)).into_response())
+}
+
+pub async fn reddit_start(
+    State(state): State<AppState>,
+    jar: CookieJar,
+    Query(query): Query<OAuthStartQuery>,
+) -> Result<Response, StatusCode> {
+    let cfg = oauth::RedditConfig::from_env(&base_url_from_env(state.cfg.port))
+        .ok_or(StatusCode::SERVICE_UNAVAILABLE)?;
+    let return_to = return_from_query_or_jar(&jar, query.return_to.as_deref());
+    let state_token = session::new_oauth_state();
+    let mock_user = if config::mock_oauth_allowed() {
+        query.mock_user.as_deref()
+    } else {
+        None
+    };
+    let url = oauth::reddit_authorize_url(&cfg, &state_token, mock_user);
     let jar = jar
         .add(session::oauth_state_cookie_value(&state_token))
         .add(session::auth_return_cookie_value(&return_to));
@@ -355,6 +444,13 @@ pub struct OAuthCallbackQuery {
     pub state: String,
 }
 
+/// Link `provider:provider_id` to a UUID.
+///
+/// - Logged in + new provider → attach to session UUID
+/// - Logged in + already ours → no-op
+/// - Logged in 

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