Fix code-review findings on multi-tenant branch

- images.rs: scope /api/img and /api/photos/{id}/original by album owner —
  close the cross-tenant original/thumbnail leak (tenancy test now covers
  these routes)
- migration 0003: refuse to run when albums exist and users != 1 instead of
  silently reassigning every album to the oldest user
- Gallery: callback-ref ResizeObserver so a gallery mounted empty still
  lays out once photos arrive (was permanently blank)
- upload dedup: re-uploading identical content whose photo is in 'error'
  resets and re-enqueues it instead of returning the broken row
- client hashing: skip (and fall back to plain upload) above 512MB to avoid
  whole-file arrayBuffer OOM / the ~2GiB cap
- zip: always spool each entry (no unread prefetched S3 body held across a
  slow client stream) and backfill BOTH sha256 and crc32 for legacy photos
- tests/auth: share one session_payload builder instead of re-implementing
  the cookie format in the test and mint_session

Cargo.lock

@@ -2574,6 +2574,7 @@ dependencies = [
  "time",
  "tokio",
  "tokio-util",
+ "tower",
  "tower-http",
  "tracing",
  "tracing-subscriber",

Cargo.toml

@@ -45,6 +45,7 @@ uuid = { version = "1", features = ["v4", "serde"] }
 
 [dev-dependencies]
 cookie = { version = "0.18", features = ["signed"] }
+tower = { version = "0.5", features = ["util"] }
 
 [profile.release]
 lto = "thin"

README.md

@@ -30,10 +30,13 @@ collect ratings and tags, and let clients download originals.
   `photos/<photo_id>/preview.jpg`, `photos/<photo_id>/thumb.jpg`. The bucket
   stays fully private; all image traffic is streamed through the API with
   auth checks (no bucket CORS or public access needed).
-- **Auth**: photographer signs in via any OIDC provider (authorization-code
+- **Auth**: photographers sign in via any OIDC provider (authorization-code
   flow + userinfo); only emails in `ALLOWED_EMAILS` may sign in, and sessions
   are re-checked against the allowlist on every request, so removing an email
-  revokes access immediately. Clients use unguessable share tokens, optionally
+  revokes access immediately. **Multi-tenant**: each allowed email is its own
+  workspace — albums, photos, and share links are owned per photographer and
+  invisible to the others (enforced via ownership-scoped data access and
+  covered by the tenant-isolation test matrix). Clients use unguessable share tokens, optionally
   gated by an argon2-hashed password (10 wrong guesses lock the link for
   15 minutes).
 - **Frontend**: React + Vite SPA — justified gallery, lightbox with rating
@@ -55,6 +58,13 @@ cargo run --bin worker        # job worker (separate terminal, same env)
 cd frontend && npm install && npm run dev   # UI on :5173, proxies /api
 ```
 
+Tests (the tenant-isolation matrix needs a disposable database):
+
+```sh
+createdb photos_test   # or: docker compose exec postgres createdb -U photos photos_test
+TEST_DATABASE_URL=postgres://photos:photos@localhost:5432/photos_test cargo test
+```
+
 Register the OIDC client with redirect URI `<PUBLIC_URL>/api/auth/callback`
 (locally: `http://localhost:5173/api/auth/callback`). Any standard OIDC
 provider works (Authentik, Keycloak, Zitadel, Dex, ...); the app uses
@@ -158,8 +168,6 @@ Notes:
 - Full RAW develop fallback for files whose embedded preview is tiny
   (exceedingly rare on modern cameras; `darktable-cli` in the worker image
   would cover it).
-- Multiple photographer accounts with separate libraries (any allowed email
-  sees everything).
 - No S3 orphan sweeper: a crash in the narrow window between an upload's S3
   put and its DB commit can leave an unreferenced original in the bucket
   (never data loss — just unclaimed storage).

frontend/src/api.js

@@ -73,9 +73,15 @@ export function postDownload(url, ids = '') {
   form.remove()
 }
 
-// SHA-256 of a File, matching the server's content hash — used to skip
+// Above this, hashing whole-file in memory (WebCrypto has no streaming digest)
-// uploading bytes the album already has.
+// risks OOM / the ~2GiB ArrayBuffer cap, so we skip the client dedup check and
+// just upload — the server still dedups on arrival.
+const CLIENT_HASH_LIMIT = 512 * 1024 * 1024
+
+// SHA-256 of a File (lowercase hex), matching the server's content hash, or
+// null when the file is too large to hash safely in the browser.
 export async function sha256Hex(file) {
+  if (file.size > CLIENT_HASH_LIMIT) return null
   const digest = await crypto.subtle.digest('SHA-256', await file.arrayBuffer())
   return [...new Uint8Array(digest)].map((b) => b.toString(16).padStart(2, '0')).join('')
 }

frontend/src/components/Gallery.jsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from 'react'
+import { useCallback, useRef, useState } from 'react'
 import { imgUrl } from '../api'
 
 // True justified layout: pack photos greedily into rows at their real aspect
@@ -32,15 +32,19 @@ function layoutRows(photos, containerWidth, targetHeight, gap) {
 }
 
 export default function Gallery({ photos, onOpen, overlay, selected, onToggleSelect }) {
-  const containerRef = useRef(null)
   const [width, setWidth] = useState(0)
+  const observerRef = useRef(null)
 
-  useEffect(() => {
+  // Callback ref: (re)attaches the observer whenever the container node
-    const el = containerRef.current
+  // mounts. A plain mount-effect misses the case where Gallery first renders
-    if (!el) return
+  // empty (no container) and photos arrive later.
+  const containerRef = useCallback((node) => {
+    observerRef.current?.disconnect()
+    if (!node) return
     const observer = new ResizeObserver((entries) => setWidth(entries[0].contentRect.width))
-    observer.observe(el)
+    observer.observe(node)
-    return () => observer.disconnect()
+    observerRef.current = observer
+    setWidth(node.getBoundingClientRect().width)
   }, [])
 
   if (photos.length === 0) return null

frontend/src/pages/AlbumPage.jsx

@@ -71,13 +71,16 @@ function UploadZone({ albumId, onUploaded }) {
         setQueue((q) => q.map((x) => (x.key === item.key ? { ...x, ...patch } : x)))
       const transfer = async () => {
         // Hash locally first: content the album already has is skipped
-        // without transferring a single byte.
+        // without transferring a single byte. Files too large to hash in the
+        // browser (null) fall straight through to a normal upload.
         update({ status: 'checking' })
         try {
           const hash = await sha256Hex(item.file)
+          if (hash) {
             await api(`/api/albums/${albumId}/photos/by-hash/${hash}`)
             update({ status: 'skipped', progress: 1 })
             return
+          }
         } catch {
           // 404 (not there yet) or hashing unavailable — upload normally.
         }

migrations/0003_multi_tenant.sql

@@ -0,0 +1,27 @@
+-- Albums gain an owner: the tenancy root. Photos, shares, ratings and tags
+-- all hang off albums, so this single column scopes everything.
+alter table albums add column owner_id uuid references users(id);
+
+-- Backfill: pre-tenancy albums had no owner. Assigning them to "the" original
+-- photographer is only unambiguous when exactly one user exists. With several
+-- (v0.1.0 let every allowed email share all albums) the correct owner is
+-- unknowable, so refuse rather than silently transfer everyone's work to one
+-- account — the operator must assign ownership manually before migrating.
+do $$
+declare
+    n_users int;
+    n_albums int;
+begin
+    select count(*) into n_users from users;
+    select count(*) into n_albums from albums;
+    if n_albums > 0 and n_users <> 1 then
+        raise exception
+            'multi-tenant migration: % albums exist but there are % users (need exactly 1 to auto-assign ownership); set albums.owner_id manually first',
+            n_albums, n_users;
+    end if;
+    update albums set owner_id = (select id from users order by created_at limit 1);
+end $$;
+
+alter table albums alter column owner_id set not null;
+
+create index albums_owner_idx on albums (owner_id);

src/auth.rs

@@ -114,11 +114,17 @@ pub(crate) fn base_cookie(name: &'static str, value: String, secure: bool) -> Co
         .build()
 }
 
+/// The signed session-cookie payload, in one place so tests and the
+/// mint_session dev tool can't drift from what user_from_jar parses.
+pub fn session_payload(user_id: Uuid, email: &str, exp: i64) -> String {
+    format!("{user_id}|{exp}|{email}")
+}
+
 fn session_cookie(state: &AppState, user_id: Uuid, email: &str) -> Cookie<'static> {
     let exp = Utc::now().timestamp() + SESSION_DAYS * 86400;
     let mut cookie = base_cookie(
         SESSION_COOKIE,
-        format!("{user_id}|{exp}|{email}"),
+        session_payload(user_id, email, exp),
         state.config.cookie_secure(),
     );
     cookie.set_max_age(time::Duration::days(SESSION_DAYS));

src/lib.rs

@@ -4,6 +4,7 @@ pub mod error;
 pub mod imaging;
 pub mod jobs;
 pub mod models;
+pub mod owned;
 pub mod routes;
 pub mod s3;
 pub mod state;

src/models.rs

@@ -96,6 +96,8 @@ impl JobStatus {
 #[derive(Debug, Clone, sqlx::FromRow, Serialize)]
 pub struct Album {
     pub id: Uuid,
+    #[serde(skip_serializing)]
+    pub owner_id: Uuid,
     pub name: String,
     pub description: String,
     pub created_at: DateTime<Utc>,

src/owned.rs

@@ -0,0 +1,46 @@
+//! Tenant-scoped data access. These are the ONLY functions admin handlers may
+//! use to fetch albums, photos, or shares — every one joins ownership, so a
+//! handler cannot accidentally reach across tenants. Another user's resource
+//! is indistinguishable from a nonexistent one (404).
+
+use uuid::Uuid;
+
+use crate::error::ApiError;
+use crate::models::{Album, Photo, Share};
+use crate::state::AppState;
+
+pub async fn album(state: &AppState, album_id: Uuid, owner: Uuid) -> Result<Album, ApiError> {
+    let album: Option<Album> =
+        sqlx::query_as("select * from albums where id = $1 and owner_id = $2")
+            .bind(album_id)
+            .bind(owner)
+            .fetch_optional(&state.db)
+            .await?;
+    album.ok_or_else(ApiError::not_found)
+}
+
+pub async fn photo(state: &AppState, photo_id: Uuid, owner: Uuid) -> Result<Photo, ApiError> {
+    let photo: Option<Photo> = sqlx::query_as(
+        "select p.* from photos p
+         join albums a on a.id = p.album_id
+         where p.id = $1 and a.owner_id = $2",
+    )
+    .bind(photo_id)
+    .bind(owner)
+    .fetch_optional(&state.db)
+    .await?;
+    photo.ok_or_else(ApiError::not_found)
+}
+
+pub async fn share(state: &AppState, share_id: Uuid, owner: Uuid) -> Result<Share, ApiError> {
+    let share: Option<Share> = sqlx::query_as(
+        "select s.* from shares s
+         join albums a on a.id = s.album_id
+         where s.id = $1 and a.owner_id = $2",
+    )
+    .bind(share_id)
+    .bind(owner)
+    .fetch_optional(&state.db)
+    .await?;
+    share.ok_or_else(ApiError::not_found)
+}

src/routes/albums.rs

@@ -6,8 +6,10 @@ use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
+use crate::auth::AuthUser;
 use crate::error::{ApiError, ApiResult};
 use crate::models::{Album, JobKind, Photo, PhotoStatus};
+use crate::owned;
 use crate::state::AppState;
 
 #[derive(Serialize, sqlx::FromRow)]
@@ -23,6 +25,7 @@ pub struct AlbumListItem {
 
 pub async fn list(
     State(state): State<AppState>,
+    user: AuthUser,
 ) -> ApiResult<Json<Vec<AlbumListItem>>> {
     let albums: Vec<AlbumListItem> = sqlx::query_as(
         "select a.id, a.name, a.description, a.created_at,
@@ -35,9 +38,11 @@ pub async fn list(
              order by coalesce(p.taken_at, p.created_at), p.filename
              limit 1
          ) c on true
+         where a.owner_id = $2
          order by a.created_at desc",
     )
     .bind(PhotoStatus::Ready.as_str())
+    .bind(user.id)
     .fetch_all(&state.db)
     .await?;
     Ok(Json(albums))
@@ -52,14 +57,17 @@ pub struct CreateAlbum {
 
 pub async fn create(
     State(state): State<AppState>,
+    user: AuthUser,
     Json(body): Json<CreateAlbum>,
 ) -> ApiResult<Json<Album>> {
     let name = body.name.trim();
     if name.is_empty() {
         return Err(ApiError::bad_request("album name is required"));
     }
-    let album: Album =
+    let album: Album = sqlx::query_as(
-        sqlx::query_as("insert into albums (name, description) values ($1, $2) returning *")
+        "insert into albums (owner_id, name, description) values ($1, $2, $3) returning *",
+    )
+    .bind(user.id)
     .bind(name)
     .bind(body.description.trim())
     .fetch_one(&state.db)
@@ -94,12 +102,10 @@ pub struct AlbumDetail {
 
 pub async fn get_one(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(album_id): Path<Uuid>,
 ) -> ApiResult<Json<AlbumDetail>> {
-    let album: Album = sqlx::query_as("select * from albums where id = $1")
+    let album = owned::album(&state, album_id, user.id).await?;
-        .bind(album_id)
-        .fetch_one(&state.db)
-        .await?;
     let photos: Vec<Photo> = sqlx::query_as(
         "select * from photos where album_id = $1
          order by coalesce(taken_at, created_at), filename",
@@ -159,6 +165,7 @@ pub struct UpdateAlbum {
 
 pub async fn update(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(album_id): Path<Uuid>,
     Json(body): Json<UpdateAlbum>,
 ) -> ApiResult<Json<Album>> {
@@ -170,12 +177,13 @@ pub async fn update(
     let album: Album = sqlx::query_as(
         "update albums
          set name = coalesce($2, name), description = coalesce($3, description)
-         where id = $1
+         where id = $1 and owner_id = $4
          returning *",
     )
     .bind(album_id)
     .bind(body.name.as_deref().map(str::trim))
     .bind(body.description.as_deref().map(str::trim))
+    .bind(user.id)
     .fetch_one(&state.db)
     .await?;
     Ok(Json(album))
@@ -183,14 +191,17 @@ pub async fn update(
 
 pub async fn delete(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(album_id): Path<Uuid>,
 ) -> ApiResult<Json<serde_json::Value>> {
     let mut tx = state.db.begin().await?;
     // Lock the album row: concurrent uploads block on their FK check against
     // it, then fail once it's gone and clean up their own S3 objects — so no
     // photo can slip in between the cleanup enqueue and the cascade delete.
-    let locked: Option<(Uuid,)> = sqlx::query_as("select id from albums where id = $1 for update")
+    let locked: Option<(Uuid,)> =
+        sqlx::query_as("select id from albums where id = $1 and owner_id = $2 for update")
             .bind(album_id)
+            .bind(user.id)
             .fetch_optional(&mut *tx)
             .await?;
     if locked.is_none() {

src/routes/images.rs

@@ -28,9 +28,20 @@ async fn authorize_photo(
         .await?;
     let photo = photo.ok_or_else(ApiError::not_found)?;
 
-    if user_from_jar(state, jar).is_some() {
+    // Photographers may only reach their OWN photos (scoped by album owner);
+    // otherwise fall through to share-cookie access.
+    if let Some(user) = user_from_jar(state, jar) {
+        let owns: Option<(Uuid,)> = sqlx::query_as(
+            "select a.id from albums a where a.id = $1 and a.owner_id = $2",
+        )
+        .bind(photo.album_id)
+        .bind(user.id)
+        .fetch_optional(&state.db)
+        .await?;
+        if owns.is_some() {
             return Ok(photo);
         }
+    }
     authorize_album_via_cookie(state, jar, photo.album_id, need_download).await?;
     // Clients may only reach photos the share listing exposes.
     if photo.status != PhotoStatus::Ready {

src/routes/photos.rs

@@ -9,9 +9,11 @@ use sha2::Digest;
 use tokio::io::AsyncWriteExt;
 use uuid::Uuid;
 
+use crate::auth::AuthUser;
 use crate::error::{ApiError, ApiResult};
 use crate::jobs;
 use crate::models::{JobKind, Photo, PhotoStatus};
+use crate::owned;
 use crate::s3;
 use crate::state::AppState;
 
@@ -39,20 +41,34 @@ fn sanitize_filename(raw: &str) -> Result<String, ApiError> {
     Ok(cleaned.chars().take(150).collect())
 }
 
+/// A dedup hit on a photo that previously failed processing means the user is
+/// re-uploading to fix it — reset it and re-enqueue instead of handing back a
+/// broken row that the UI would report as "already uploaded".
+async fn heal_if_errored(state: &AppState, photo: Photo) -> ApiResult<Photo> {
+    if photo.status != PhotoStatus::Error {
+        return Ok(photo);
+    }
+    let mut tx = state.db.begin().await?;
+    let healed: Photo =
+        sqlx::query_as("update photos set status = $2, error = null where id = $1 returning *")
+            .bind(photo.id)
+            .bind(PhotoStatus::Uploaded.as_str())
+            .fetch_one(&mut *tx)
+            .await?;
+    jobs::ensure_process_photo(&mut tx, photo.id).await?;
+    tx.commit().await?;
+    Ok(healed)
+}
+
 pub async fn upload(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(album_id): Path<Uuid>,
     Query(query): Query<UploadQuery>,
     headers: HeaderMap,
     body: Body,
 ) -> ApiResult<Json<Photo>> {
-    let album_exists: Option<(Uuid,)> = sqlx::query_as("select id from albums where id = $1")
+    owned::album(&state, album_id, user.id).await?;
-        .bind(album_id)
-        .fetch_optional(&state.db)
-        .await?;
-    if album_exists.is_none() {
-        return Err(ApiError::not_found());
-    }
 
     let filename = sanitize_filename(&query.filename)?;
     let content_type = headers
@@ -97,7 +113,7 @@ pub async fn upload(
             .fetch_optional(&state.db)
             .await?;
     if let Some(existing) = existing {
-        return Ok(Json(existing));
+        return Ok(Json(heal_if_errored(&state, existing).await?));
     }
 
     // Upload to S3 first, then create the row and enqueue processing in one
@@ -156,7 +172,7 @@ pub async fn upload(
                         .fetch_optional(&state.db)
                         .await?;
                 if let Some(winner) = winner {
-                    return Ok(Json(winner));
+                    return Ok(Json(heal_if_errored(&state, winner).await?));
                 }
             }
             return Err(e.into());
@@ -178,8 +194,10 @@ pub async fn upload(
 /// content already exists in the album.
 pub async fn by_hash(
     State(state): State<AppState>,
+    user: AuthUser,
     Path((album_id, sha256)): Path<(Uuid, String)>,
 ) -> ApiResult<Json<Photo>> {
+    owned::album(&state, album_id, user.id).await?;
     let photo: Option<Photo> =
         sqlx::query_as("select * from photos where album_id = $1 and sha256 = $2")
             .bind(album_id)
@@ -191,8 +209,10 @@ pub async fn by_hash(
 
 pub async fn delete(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(photo_id): Path<Uuid>,
 ) -> ApiResult<Json<serde_json::Value>> {
+    owned::photo(&state, photo_id, user.id).await?;
     let mut tx = state.db.begin().await?;
     let deleted = sqlx::query("delete from photos where id = $1")
         .bind(photo_id)
@@ -213,8 +233,10 @@ pub async fn delete(
 
 pub async fn reprocess(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(photo_id): Path<Uuid>,
 ) -> ApiResult<Json<serde_json::Value>> {
+    owned::photo(&state, photo_id, user.id).await?;
     let mut tx = state.db.begin().await?;
     let updated = sqlx::query("update photos set status = $2, error = null where id = $1")
         .bind(photo_id)

src/routes/shares.rs

@@ -7,8 +7,9 @@ use chrono::{DateTime, Utc};
 use serde::Deserialize;
 use uuid::Uuid;
 
-use crate::auth::random_token;
+use crate::auth::{random_token, AuthUser};
 use crate::error::{ApiError, ApiResult};
+use crate::owned;
 use crate::state::AppState;
 
 #[derive(sqlx::FromRow)]
@@ -48,8 +49,10 @@ const SHARE_COLUMNS: &str = "s.id, s.token, s.label, s.password_hash, s.allow_do
 
 pub async fn list(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(album_id): Path<Uuid>,
 ) -> ApiResult<Json<Vec<serde_json::Value>>> {
+    owned::album(&state, album_id, user.id).await?;
     let rows: Vec<ShareAdminRow> = sqlx::query_as(&format!(
         "select {SHARE_COLUMNS} from shares s where s.album_id = $1 order by s.created_at desc"
     ))
@@ -75,16 +78,11 @@ fn default_true() -> bool {
 
 pub async fn create(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(album_id): Path<Uuid>,
     Json(body): Json<CreateShare>,
 ) -> ApiResult<Json<serde_json::Value>> {
-    let album_exists: Option<(Uuid,)> = sqlx::query_as("select id from albums where id = $1")
+    owned::album(&state, album_id, user.id).await?;
-        .bind(album_id)
-        .fetch_optional(&state.db)
-        .await?;
-    if album_exists.is_none() {
-        return Err(ApiError::not_found());
-    }
 
     let password_hash = match body.password.as_deref().map(str::trim) {
         Some(pw) if !pw.is_empty() => {
@@ -131,8 +129,10 @@ pub async fn create(
 /// their way into the 15-minute lock).
 pub async fn reset_lock(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(share_id): Path<Uuid>,
 ) -> ApiResult<Json<serde_json::Value>> {
+    owned::share(&state, share_id, user.id).await?;
     let updated =
         sqlx::query("update shares set failed_attempts = 0, locked_until = null where id = $1")
             .bind(share_id)
@@ -146,8 +146,10 @@ pub async fn reset_lock(
 
 pub async fn delete(
     State(state): State<AppState>,
+    user: AuthUser,
     Path(share_id): Path<Uuid>,
 ) -> ApiResult<Json<serde_json::Value>> {
+    owned::share(&state, share_id, user.id).await?;
     let deleted = sqlx::query("delete from shares where id = $1")
         .bind(share_id)
         .execute(&state.db)

src/routes/zip.rs

@@ -81,12 +81,13 @@ async fn album_name(state: &AppState, album_id: Uuid) -> Result<String, ApiError
 
 pub async fn album_zip(
     State(state): State<AppState>,
+    user: crate::auth::AuthUser,
     Path(album_id): Path<Uuid>,
     Form(request): Form<ZipRequest>,
 ) -> ApiResult<Response> {
-    let name = album_name(&state, album_id).await?;
+    let album = crate::owned::album(&state, album_id, user.id).await?;
     let photos = ready_photos(&state, album_id, &parse_ids(&request.ids)?).await?;
-    stream_zip(state, photos, &name)
+    stream_zip(state, photos, &album.name)
 }
 
 pub async fn share_zip(
@@ -136,9 +137,6 @@ struct Entry {
     offset: u64,
     dos_time: u16,
     dos_date: u16,
-    /// Stored at upload/processing time; photos from before hashes existed
-    /// have None and take the slower spool path (which backfills it).
-    crc: Option<u32>,
 }
 
 struct ZipPlan {
@@ -179,7 +177,6 @@ fn plan_zip(photos: &[Photo]) -> Result<ZipPlan, ApiError> {
             offset: entry_offset,
             dos_time,
             dos_date,
-            crc: photo.crc32.map(|v| v as u32),
         });
     }
     let cd_offset = offset;
@@ -281,23 +278,26 @@ fn stream_zip(state: AppState, photos: Vec<Photo>, album_name: &str) -> ApiResul
         .map_err(|e| anyhow::anyhow!("building response: {e}").into())
 }
 
-enum Fetched {
+struct Fetched {
-    /// CRC already known — the body streams straight into the response.
+    file: tokio::fs::File,
-    Direct(Box<aws_sdk_s3::operation::get_object::GetObjectOutput>),
+    crc: u32,
-    /// Pre-hash photo: spooled to a temp file to compute the CRC first.
+    /// sha256 hex — always computed so legacy photos (crc-only) get their
-    Spooled(tokio::fs::File, u32),
+    /// content hash backfilled, restoring upload dedup for them.
+    sha256: String,
 }
 
-/// Start fetching an original. With a known CRC this only opens the S3
+/// Fetch an original and spool it to an anonymous temp file, computing crc32
-/// response (the body is consumed later, straight into the zip stream);
+/// and sha256 and verifying the byte count the zip plan promised. Spooling
-/// otherwise the object is spooled to an anonymous temp file to compute the
+/// (rather than streaming the live S3 body straight through) is deliberate:
-/// CRC, verifying the byte count the zip plan promised.
+/// the prefetched entry is fully read immediately, so no S3 connection sits
+/// idle across the previous entry's (possibly slow) client stream — which S3
+/// idle-timeouts would otherwise reset mid-download.
 fn fetch_entry(
     state: &AppState,
     key: String,
     expected_size: u64,
-    crc_known: bool,
 ) -> JoinHandle<anyhow::Result<Fetched>> {
+    use sha2::Digest;
     let state = state.clone();
     tokio::spawn(async move {
         let object = state
@@ -308,12 +308,10 @@ fn fetch_entry(
             .send()
             .await
             .map_err(|e| anyhow::anyhow!("fetching {key}: {e}"))?;
-        if crc_known {
-            return Ok(Fetched::Direct(Box::new(object)));
-        }
         let mut file = tokio::fs::File::from_std(tempfile::tempfile()?);
         let mut reader = object.body.into_async_read();
-        let mut hasher = crc32fast::Hasher::new();
+        let mut crc = crc32fast::Hasher::new();
+        let mut sha = sha2::Sha256::new();
         let mut written: u64 = 0;
         let mut buf = vec![0u8; 128 * 1024];
         loop {
@@ -321,7 +319,8 @@ fn fetch_entry(
             if n == 0 {
                 break;
             }
-            hasher.update(&buf[..n]);
+            crc.update(&buf[..n]);
+            sha.update(&buf[..n]);
             file.write_all(&buf[..n]).await?;
             written += n as u64;
         }
@@ -331,7 +330,11 @@ fn fetch_entry(
         );
         file.flush().await?;
         file.seek(std::io::SeekFrom::Start(0)).await?;
-        Ok(Fetched::Spooled(file, hasher.finalize()))
+        Ok(Fetched {
+            file,
+            crc: crc.finalize(),
+            sha256: hex::encode(sha.finalize()),
+        })
     })
 }
 
@@ -344,30 +347,23 @@ async fn write_zip(
     const FLAGS: u16 = 0x0800;
     let mut crcs = Vec::with_capacity(plan.entries.len());
 
-    // Prefetch: start fetching the next object while streaming the current one.
+    // Prefetch: spool the next object to a temp file while streaming the
+    // current one — the prefetched body is drained immediately, never held
+    // open across the current entry's client stream.
     let mut pending: Option<JoinHandle<anyhow::Result<Fetched>>> = None;
     for (i, entry) in plan.entries.iter().enumerate() {
         let current = match pending.take() {
             Some(handle) => handle,
-            None => fetch_entry(state, entry.s3_key.clone(), entry.size, entry.crc.is_some()),
+            None => fetch_entry(state, entry.s3_key.clone(), entry.size),
         };
         if let Some(next) = plan.entries.get(i + 1) {
-            pending = Some(fetch_entry(
+            pending = Some(fetch_entry(state, next.s3_key.clone(), next.size));
-                state,
-                next.s3_key.clone(),
-                next.size,
-                next.crc.is_some(),
-            ));
         }
-        let fetched = current
+        let mut fetched = current
             .await
             .map_err(|e| anyhow::anyhow!("fetch task failed: {e}"))?
             .map_err(|e| anyhow::anyhow!("photo {}: {e:#}", entry.photo_id))?;
-        let crc = match &fetched {
+        crcs.push(fetched.crc);
-            Fetched::Direct(_) => entry.crc.expect("direct fetch implies known crc"),
-            Fetched::Spooled(_, crc) => *crc,
-        };
-        crcs.push(crc);
 
         let mut lfh = Vec::with_capacity(30 + entry.name.len());
         lfh.extend_from_slice(&0x04034b50u32.to_le_bytes());
@@ -376,36 +372,27 @@ async fn write_zip(
         lfh.extend_from_slice(&0u16.to_le_bytes()); // method: stored
         lfh.extend_from_slice(&entry.dos_time.to_le_bytes());
         lfh.extend_from_slice(&entry.dos_date.to_le_bytes());
-        lfh.extend_from_slice(&crc.to_le_bytes());
+        lfh.extend_from_slice(&fetched.crc.to_le_bytes());
         lfh.extend_from_slice(&(entry.size as u32).to_le_bytes()); // compressed
         lfh.extend_from_slice(&(entry.size as u32).to_le_bytes()); // uncompressed
         lfh.extend_from_slice(&(entry.name.len() as u16).to_le_bytes());
         lfh.extend_from_slice(&0u16.to_le_bytes()); // extra len
         lfh.extend_from_slice(&entry.name);
         out.write_all(&lfh).await?;
-        match fetched {
+        tokio::io::copy(&mut fetched.file, &mut out).await?;
-            Fetched::Direct(object) => {
+
-                let mut reader = object.body.into_async_read();
+        // Self-heal legacy photos: backfill both hashes so future zips and
-                let copied = tokio::io::copy(&mut reader, &mut out).await?;
+        // upload dedup both work for them.
-                anyhow::ensure!(
+        let _ = sqlx::query(
-                    copied == entry.size,
+            "update photos set crc32 = coalesce(crc32, $2), sha256 = coalesce(sha256, $3)
-                    "{} is {copied} bytes in s3 but {} in the database",
+             where id = $1",
-                    entry.s3_key,
+        )
-                    entry.size
-                );
-            }
-            Fetched::Spooled(mut file, crc) => {
-                tokio::io::copy(&mut file, &mut out).await?;
-                // Self-heal: store the freshly computed crc so the next
-                // download of this photo streams directly.
-                let _ = sqlx::query("update photos set crc32 = coalesce(crc32, $2) where id = $1")
         .bind(entry.photo_id)
-                    .bind(i64::from(crc))
+        .bind(i64::from(fetched.crc))
+        .bind(&fetched.sha256)
         .execute(&state.db)
         .await;
     }
-        }
-    }
 
     // Central directory.
     for (entry, crc) in plan.entries.iter().zip(&crcs) {

tests/tenancy.rs

@@ -0,0 +1,254 @@
+//! Tenant-isolation matrix: every admin endpoint must treat another user's
+//! resources as nonexistent (404), and unauthenticated requests as 401.
+//!
+//! Needs a disposable Postgres database:
+//!   TEST_DATABASE_URL=postgres://photos:photos@localhost:5432/photos_test cargo test
+//! Skips silently when TEST_DATABASE_URL is unset. S3 is never contacted —
+//! the matrix stops at the ownership checks by construction.
+
+use axum::body::Body;
+use axum::http::{header, Request, StatusCode};
+use cookie::{Cookie, CookieJar, Key};
+use sha2::{Digest, Sha512};
+use tower::ServiceExt;
+use uuid::Uuid;
+
+use photos::config::Config;
+use photos::state::AppState;
+
+const SECRET: &str = "test-secret-test-secret-test-secret-1234";
+
+fn test_config(database_url: String) -> Config {
+    Config {
+        database_url,
+        bind_addr: "127.0.0.1:0".into(),
+        public_url: "http://localhost:8080".into(),
+        session_secret: SECRET.into(),
+        s3_bucket: "photos".into(),
+        // Unroutable on purpose: no test may reach S3.
+        s3_endpoint: Some("http://127.0.0.1:9".into()),
+        s3_region: "us-east-1".into(),
+        s3_access_key: "test".into(),
+        s3_secret_key: "test".into(),
+        s3_force_path_style: true,
+        oidc_issuer: "https://auth.invalid".into(),
+        oidc_client_id: "x".into(),
+        oidc_client_secret: "x".into(),
+        allowed_emails: vec!["a@test".into(), "b@test".into()],
+        static_dir: "frontend/dist".into(),
+        worker_concurrency: 1,
+        dev_autologin_email: None,
+    }
+}
+
+fn session_for(user_id: Uuid, email: &str) -> String {
+    let key = Key::from(&Sha512::digest(SECRET.as_bytes()));
+    let exp = chrono::Utc::now().timestamp() + 3600;
+    // Use the production payload builder so the test can't drift from what
+    // user_from_jar parses.
+    let mut jar = CookieJar::new();
+    jar.signed_mut(&key).add(Cookie::new(
+        "photos_session",
+        photos::auth::session_payload(user_id, email, exp),
+    ));
+    format!("photos_session={}", jar.get("photos_session").unwrap().value())
+}
+
+async fn request(
+    router: &axum::Router,
+    method: &str,
+    path: &str,
+    cookie: Option<&str>,
+    json: Option<serde_json::Value>,
+) -> (StatusCode, serde_json::Value) {
+    let mut builder = Request::builder().method(method).uri(path);
+    if let Some(cookie) = cookie {
+        builder = builder.header(header::COOKIE, cookie);
+    }
+    let body = match json {
+        Some(value) => {
+            builder = builder.header(header::CONTENT_TYPE, "application/json");
+            Body::from(value.to_string())
+        }
+        // Zip endpoints take a form; everything else ignores the body.
+        None if path.ends_with("/zip") => {
+            builder = builder.header(header::CONTENT_TYPE, "application/x-www-form-urlencoded");
+            Body::from("ids=")
+        }
+        None => Body::empty(),
+    };
+    let response = router
+        .clone()
+        .oneshot(builder.body(body).unwrap())
+        .await
+        .unwrap();
+    let status = response.status();
+    let bytes = axum::body::to_bytes(response.into_body(), 1 << 20)
+        .await
+        .unwrap();
+    let value = serde_json::from_slice(&bytes).unwrap_or(serde_json::Value::Null);
+    (status, value)
+}
+
+async fn seed_user(state: &AppState, email: &str) -> Uuid {
+    let (id,): (Uuid,) = sqlx::query_as(
+        "insert into users (oidc_subject, email) values ($1, $2) returning id",
+    )
+    .bind(format!("test:{email}"))
+    .bind(email)
+    .fetch_one(&state.db)
+    .await
+    .unwrap();
+    id
+}
+
+#[tokio::test]
+async fn tenant_isolation_matrix() {
+    let Ok(database_url) = std::env::var("TEST_DATABASE_URL") else {
+        eprintln!("TEST_DATABASE_URL not set — skipping tenancy matrix");
+        return;
+    };
+    let state = AppState::new(test_config(database_url)).await.unwrap();
+    sqlx::query("truncate users, albums, photos, shares, ratings, tags, jobs cascade")
+        .execute(&state.db)
+        .await
+        .unwrap();
+
+    let alice = seed_user(&state, "a@test").await;
+    let bob = seed_user(&state, "b@test").await;
+    let cookie_a = session_for(alice, "a@test");
+    let cookie_b = session_for(bob, "b@test");
+    let router = photos::routes::router(&state).with_state(state.clone());
+
+    // Alice creates an album through the real API.
+    let (status, album) = request(
+        &router,
+        "POST",
+        "/api/albums",
+        Some(&cookie_a),
+        Some(serde_json::json!({ "name": "Alice's Wedding" })),
+    )
+    .await;
+    assert_eq!(status, StatusCode::OK);
+    let album_id = album["id"].as_str().unwrap().to_string();
+
+    // Seed a photo (kept non-ready so no code path reaches S3) and a share.
+    let photo_id = Uuid::new_v4();
+    sqlx::query(
+        "insert into photos (id, album_id, filename, content_type, size_bytes, sha256)
+         values ($1, $2::uuid, 'a.jpg', 'image/jpeg', 3, 'hash-a')",
+    )
+    .bind(photo_id)
+    .bind(&album_id)
+    .execute(&state.db)
+    .await
+    .unwrap();
+    let share_id = Uuid::new_v4();
+    sqlx::query("insert into shares (id, album_id, token) values ($1, $2::uuid, 'tenanttesttoken123456789')")
+        .bind(share_id)
+        .bind(&album_id)
+        .execute(&state.db)
+        .await
+        .unwrap();
+
+    // ---- Bob vs Alice's resources: everything must be a 404 (or absent). ----
+    let bob_hits: &[(&str, String, Option<serde_json::Value>)] = &[
+        ("GET", format!("/api/albums/{album_id}"), None),
+        (
+            "PATCH",
+            format!("/api/albums/{album_id}"),
+            Some(serde_json::json!({ "name": "stolen" })),
+        ),
+        ("DELETE", format!("/api/albums/{album_id}"), None),
+        ("POST", format!("/api/albums/{album_id}/photos?filename=x.jpg"), None),
+        ("GET", format!("/api/albums/{album_id}/shares"), None),
+        (
+            "POST",
+            format!("/api/albums/{album_id}/shares"),
+            Some(serde_json::json!({ "label": "x" })),
+        ),
+        ("POST", format!("/api/albums/{album_id}/zip"), None),
+        ("GET", format!("/api/albums/{album_id}/photos/by-hash/hash-a"), None),
+        ("DELETE", format!("/api/photos/{photo_id}"), None),
+        ("POST", format!("/api/photos/{photo_id}/reprocess"), None),
+        ("DELETE", format!("/api/shares/{share_id}"), None),
+        ("POST", format!("/api/shares/{share_id}/reset-lock"), None),
+    ];
+    for (method, path, body) in bob_hits {
+        let (status, _) = request(&router, method, path, Some(&cookie_b), body.clone()).await;
+        assert_eq!(
+            status,
+            StatusCode::NOT_FOUND,
+            "cross-tenant {method} {path} must 404"
+        );
+    }
+    let (status, list) = request(&router, "GET", "/api/albums", Some(&cookie_b), None).await;
+    assert_eq!(status, StatusCode::OK);
+    assert_eq!(list.as_array().unwrap().len(), 0, "bob must see no albums");
+
+    // ---- Dual-auth image routes must ALSO reject a non-owning photographer.
+    // Bob owns no share and doesn't own the album, so authorize_photo falls
+    // through to the share-cookie path and 401s BEFORE any S3 access — the
+    // cross-tenant original leak these routes previously allowed. ----
+    for path in [
+        format!("/api/img/{photo_id}/thumb"),
+        format!("/api/img/{photo_id}/preview"),
+        format!("/api/photos/{photo_id}/original"),
+    ] {
+        let (status, _) = request(&router, "GET", &path, Some(&cookie_b), None).await;
+        assert_eq!(
+            status,
+            StatusCode::UNAUTHORIZED,
+            "cross-tenant image GET {path} must not authorize"
+        );
+    }
+
+    // ---- Alice keeps full access to her own resources. ----
+    let (status, list) = request(&router, "GET", "/api/albums", Some(&cookie_a), None).await;
+    assert_eq!(status, StatusCode::OK);
+    assert_eq!(list.as_array().unwrap().len(), 1);
+    let (status, _) = request(
+        &router,
+        "GET",
+        &format!("/api/albums/{album_id}"),
+        Some(&cookie_a),
+        None,
+    )
+    .await;
+    assert_eq!(status, StatusCode::OK);
+    let (status, _) = request(
+        &router,
+        "GET",
+        &format!("/api/albums/{album_id}/photos/by-hash/hash-a"),
+        Some(&cookie_a),
+        None,
+    )
+    .await;
+    assert_eq!(status, StatusCode::OK);
+    // Ownership check runs before the body is read: empty upload = 400, not 404.
+    let (status, _) = request(
+        &router,
+        "POST",
+        &format!("/api/albums/{album_id}/photos?filename=x.jpg"),
+        Some(&cookie_a),
+        None,
+    )
+    .await;
+    assert_eq!(status, StatusCode::BAD_REQUEST);
+    // No ready photos yet: zip is a 400 for the owner, never an S3 call.
+    let (status, _) = request(
+        &router,
+        "POST",
+        &format!("/api/albums/{album_id}/zip"),
+        Some(&cookie_a),
+        None,
+    )
+    .await;
+    assert_eq!(status, StatusCode::BAD_REQUEST);
+
+    // ---- No session at all: 401 on the admin surface. ----
+    for path in ["/api/albums", "/api/me"] {
+        let (status, _) = request(&router, "GET", path, None, None).await;
+        assert_eq!(status, StatusCode::UNAUTHORIZED, "{path} without session");
+    }
+}