feat(drive): permanent deletion per drive

frontend/src/lib/api/endpoints/trash.ts

@@ -111,3 +111,19 @@ export async function emptyTrash(): Promise<void> {
 	});
 	if (!res.ok) throw new Error(`empty trash failed: ${res.status}`);
 }
+
+/**
+ * `DELETE /api/trash/drive/{drive_id}` — empty the trash within a
+ * single drive. Used by the trash page's Drive group-by, where each
+ * bucket header carries a per-drive Empty button so multi-drive
+ * owners don't have to wipe everything at once. Refused 404 when the
+ * caller lacks Delete on the named drive (anti-enum).
+ */
+export async function emptyTrashForDrive(driveId: string): Promise<void> {
+	const res = await apiFetch(`/api/trash/drive/${encodeURIComponent(driveId)}`, {
+		method: 'DELETE',
+		credentials: 'same-origin',
+		headers: getCsrfHeaders()
+	});
+	if (!res.ok) throw new Error(`empty drive trash failed: ${res.status}`);
+}

frontend/src/lib/components/ResourceList.svelte

@@ -87,6 +87,14 @@
 		dateLabel?: string;
 		/** Custom renderer for the date cell (e.g. trash expiry chip). */
 		dateCell?: Snippet<[ResourceEntry]>;
+		/**
+		 * Optional per-bucket action button rendered alongside the swimlane
+		 * header label. Receives the bucket key (the value `bucketOf`
+		 * returned for the active group-by). Used by the trash page to expose
+		 * a per-drive "Empty" affordance — the page decides which group-bys
+		 * the action is meaningful for and returns nothing otherwise.
+		 */
+		bucketAction?: Snippet<[string]>;
 		/** Show the owner column + vignette (list view) and hover tooltip. */
 		showOwner?: boolean;
 		/** Allow grid/list toggle (shares the app-wide view mode). */
@@ -131,6 +139,7 @@
 		showDate = true,
 		dateLabel,
 		dateCell,
+		bucketAction,
 		showOwner = false,
 		showViewToggle = true,
 		selectable = false,
@@ -434,7 +443,14 @@
 			<div class={viewClass} style="--files-list-columns: {columns}">
 				{@render listHeader()}
 				{#each sections as section (section.key)}
-					<div class="rl-swimlane-header" role="rowheader">{section.label}</div>
+					<div class="rl-swimlane-header" role="rowheader">
+						<span class="rl-swimlane-header__label">{section.label}</span>
+						{#if bucketAction}
+							<span class="rl-swimlane-header__action">
+								{@render bucketAction(section.key)}
+							</span>
+						{/if}
+					</div>
 					{#if filesStore.viewMode === 'list'}
 						<!-- Window each section's rows so a large grouped list (e.g. a big
 						     trash, grouped by remaining days) doesn't mount every row. The
@@ -651,6 +667,16 @@
 		font-weight: var(--weight-semibold);
 		color: var(--color-text-secondary);
 		border-bottom: 1px solid var(--color-border-faint);
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: var(--space-2);
+	}
+
+	/* Optional per-bucket action (e.g. trash page's per-drive Empty). */
+	.rl-swimlane-header__action {
+		display: inline-flex;
+		align-items: center;
 	}
 
 	/* Grid view date meta line. */

frontend/src/routes/trash/+page.svelte

@@ -4,6 +4,7 @@
 	import {
 		deleteTrashItem,
 		emptyTrash,
+		emptyTrashForDrive,
 		expiryChip,
 		fetchTrashPage,
 		remainingDaysBucket,
@@ -184,6 +185,60 @@
 		}
 	}
 
+	// Per-drive empty (D2b stage 4 follow-up). The bucket key on the
+	// Drive group-by encodes "{rank}:{driveId}" so the natural lexical
+	// sort puts default-personal first; we strip the rank prefix here
+	// to recover the raw drive UUID. Only an Owner of the drive
+	// (Delete-bearing role) reaches the per-drive Empty button because
+	// the backend resolves a Delete-set first and refuses (404) any
+	// other drive.
+	function driveIdFromBucketKey(key: string): string {
+		return key.includes(':') ? (key.split(':')[1] ?? key) : key;
+	}
+
+	async function purgeDrive(bucketKey: string) {
+		const driveId = driveIdFromBucketKey(bucketKey);
+		const drive = drivesStore.findById(driveId);
+		// Owner-only check mirrors the backend gate so the UI doesn't
+		// surface the action for non-Owners — keeps the affordance
+		// honest. The bucket only appears on the page if the trash list
+		// already contained items the caller could see, but caller_role
+		// distinguishes Owner from Viewer/Editor on shared drives.
+		const ok = await confirmDialog({
+			title: t('trash.empty_drive_title', 'Empty drive trash'),
+			message: t(
+				'trash.confirm_empty_drive',
+				{ name: drive?.name ?? driveId },
+				'Empty the trash on drive "{{name}}"? This cannot be undone.'
+			),
+			confirmText: t('trash.empty_action', 'Empty trash'),
+			danger: true
+		});
+		if (!ok) return;
+		try {
+			await emptyTrashForDrive(driveId);
+			// Drop every entry that belonged to this drive; cheaper than a
+			// full refetch and matches what the user just saw.
+			raw = raw.filter((it) => it.drive_id !== driveId);
+		} catch (e) {
+			errorToast(e);
+		}
+	}
+
+	// The Drive group-by is the only one where a per-bucket empty
+	// affordance is meaningful — every other bucket key (remaining
+	// days, type, size, trashed time) isn't a permission scope. Hide
+	// the button on those group-bys.
+	const showPerDriveEmpty = $derived(groupBy === 'drive');
+
+	function driveCanPurge(driveId: string): boolean {
+		const d = drivesStore.findById(driveId);
+		// `caller_role === 'owner'` is the same gate the backend
+		// applies via Permission::Delete in the role bundle. Hide the
+		// button on Viewer/Editor drives so a click can't 404.
+		return d?.caller_role === 'owner';
+	}
+
 	onMount(() => {
 		// Drive names for the "Drive" group-by labels — `drivesStore.load()` is
 		// idempotent (cached on the singleton) so this is essentially free.
@@ -228,6 +283,23 @@
 			{chip.label}
 		</span>
 	{/snippet}
+	{#snippet bucketAction(bucketKey: string)}
+		{#if showPerDriveEmpty}
+			{@const driveId = driveIdFromBucketKey(bucketKey)}
+			{#if driveCanPurge(driveId)}
+				<button
+					type="button"
+					class="btn-action btn-action--delete"
+					data-testid={`trash-empty-drive-btn-${driveId}`}
+					title={t('trash.empty_drive_title', 'Empty drive trash')}
+					aria-label={t('trash.empty_drive_title', 'Empty drive trash')}
+					onclick={() => purgeDrive(bucketKey)}
+				>
+					<Icon name="trash" />
+				</button>
+			{/if}
+		{/if}
+	{/snippet}
 	{#snippet actions(entry)}
 		<button
 			class="btn-action"

src/application/ports/trash_ports.rs

@@ -19,4 +19,14 @@ pub trait TrashUseCase: Send + Sync {
 
     /// Empty the trash for a specific user
     async fn empty_trash(&self, user_id: Uuid) -> Result<()>;
+
+    /// Empty the trash within a single drive the caller can Delete in.
+    ///
+    /// Same destructive shape as `empty_trash`, but scoped to one drive
+    /// — the Drive group-by on `/trash` exposes a per-row "Empty"
+    /// affordance so multi-drive owners can clear one drive without
+    /// touching the others. Refused (`NotFound`) when the caller has no
+    /// Delete-bearing role on the named drive (anti-enum: same shape
+    /// as if the drive didn't exist), or when the drive id is unknown.
+    async fn empty_trash_for_drive(&self, user_id: Uuid, drive_id: Uuid) -> Result<()>;
 }

src/application/services/trash_service.rs

@@ -725,6 +725,46 @@ impl TrashUseCase for TrashService {
         // the drives where the caller is effectively Owner (direct or via a
         // group). Single-drive users: this resolves to just their personal
         // drive, identical to the legacy `WHERE user_id = $1` scope.
+        let drive_ids = self.drives_with_delete_for(user_id).await?;
+        if drive_ids.is_empty() {
+            info!("empty_trash: caller has Delete on no drive — nothing to do");
+            return Ok(());
+        }
+        self.clear_trash_in(&drive_ids, user_id).await
+    }
+
+    #[instrument(skip(self))]
+    async fn empty_trash_for_drive(&self, user_id: Uuid, drive_id: Uuid) -> Result<()> {
+        // Per-drive trash empty — the Drive group-by on `/trash` exposes
+        // this as a per-row affordance so multi-drive owners can clear
+        // one drive without touching the others. Refuses with
+        // `NotFound` (anti-enum) when the caller lacks Delete on the
+        // named drive — same shape as the user-facing drive listing
+        // would emit for an unknown id.
+        let allowed = self.drives_with_delete_for(user_id).await?;
+        if !allowed.contains(&drive_id) {
+            tracing::info!(
+                target: "audit",
+                event = "trash.empty_drive_rejected",
+                reason = "no_delete_on_drive",
+                user_id = %user_id,
+                drive_id = %drive_id,
+                "👮🏻‍♂️ refused per-drive empty — caller lacks Delete on this drive",
+            );
+            return Err(DomainError::not_found("Drive", drive_id.to_string()));
+        }
+        info!("Emptying trash for drive {} (user {})", drive_id, user_id);
+        self.clear_trash_in(&[drive_id], user_id).await
+    }
+}
+
+impl TrashService {
+    /// Drives where the caller has `Permission::Delete` (via any role
+    /// bundle, direct or group-mediated). Shared by `empty_trash` and
+    /// `empty_trash_for_drive`; lifting the lookup out of both methods
+    /// keeps the two HTTP surfaces semantically consistent and avoids
+    /// duplicating the subject-expansion plumbing.
+    async fn drives_with_delete_for(&self, user_id: Uuid) -> Result<Vec<Uuid>> {
         let (subject_types, subject_ids) = self
             .authz
             .expand_subject_for_listing(Subject::User(user_id))
@@ -739,29 +779,32 @@ impl TrashUseCase for TrashService {
                     format!("Failed to resolve accessible drives: {e:?}"),
                 )
             })?;
-        let drive_ids: Vec<Uuid> = drives
+        Ok(drives
             .iter()
             .filter(|d| {
                 d.caller_role
                     .is_some_and(|r| r.expand().contains(&Permission::Delete))
             })
             .map(|d| d.drive.id)
-            .collect();
+            .collect())
-
-        if drive_ids.is_empty() {
-            info!("empty_trash: caller has Delete on no drive — nothing to do");
-            return Ok(());
     }
 
-        // Collect ALL trashed file IDs BEFORE bulk-deleting so hooks (thumbnail
+    /// Bulk-clear trash within the given drives, running every side
-        // cleanup, etc.) can run afterward.  We use get_all_trashed_file_ids (not
+    /// effect once: trashed-file id list (for hooks), `clear_trash`
-        // get_trash_items) because the trash_items view excludes files inside a
+    /// SQL, dedup GC, content-cache invalidation, file-deleted hook.
-        // trashed folder — those files will still be deleted by clear_trash via
+    /// The two `TrashUseCase` entry points compose this with their
-        // the folder CASCADE, but their hooks would otherwise be missed.
+    /// respective drive-id scopes — call-once, no duplication.
+    async fn clear_trash_in(&self, drive_ids: &[Uuid], user_id: Uuid) -> Result<()> {
+        // Collect ALL trashed file IDs BEFORE bulk-deleting so hooks
+        // (thumbnail cleanup, etc.) can run afterward. We use
+        // `get_all_trashed_file_ids` (not `get_trash_items`) because the
+        // trash_items view excludes files inside a trashed folder —
+        // those files will still be deleted by `clear_trash` via the
+        // folder CASCADE, but their hooks would otherwise be missed.
         let trashed_file_ids: Vec<String> = if self.file_deleted_hook.is_some() {
             match self
                 .trash_repository
-                .get_all_trashed_file_ids(&drive_ids)
+                .get_all_trashed_file_ids(drive_ids)
                 .await
             {
                 Ok(ids) => ids,
@@ -781,29 +824,29 @@ impl TrashUseCase for TrashService {
         // Folder deletion cascades (FK ON DELETE CASCADE) to child folders and
         // their files. The PG trigger `trg_files_decrement_blob_ref` automatically
         // decrements blob ref_counts for every deleted file row.
-        self.trash_repository.clear_trash(&drive_ids).await?;
+        self.trash_repository.clear_trash(drive_ids).await?;
 
-        // The PG trigger decremented ref_counts but cannot delete disk files or
+        // The PG trigger decremented ref_counts but cannot delete disk
-        // thumbnails.  Run garbage_collect() to remove any blobs whose ref_count
+        // files or thumbnails. `garbage_collect()` removes any blobs
-        // reached 0, along with their blob-keyed thumbnail files.
+        // whose ref_count reached 0, along with their blob-keyed
+        // thumbnail files. Failure here is non-fatal — the rows are
+        // gone in any case; the next GC pass mops up.
         if let Err(e) = self.dedup_service.garbage_collect().await {
-            warn!("empty_trash: garbage_collect failed: {:?}", e);
+            warn!("clear_trash_in: garbage_collect failed: {:?}", e);
         }
 
-        // Invalidate content cache for all permanently deleted files.
         if let Some(cc) = &self.content_cache {
             for file_id in &trashed_file_ids {
                 cc.invalidate(file_id).await;
             }
         }
-
         if let Some(hook) = &self.file_deleted_hook {
             for file_id in &trashed_file_ids {
                 hook.on_file_deleted(file_id);
             }
         }
 
-        info!("Trash emptied for user {}", user_id);
+        info!("Trash cleared across {} drive(s) for user {}", drive_ids.len(), user_id);
         Ok(())
     }
 }

src/application/services/trash_service_test.rs

@@ -319,6 +319,14 @@ where
         // via `drive_repo.list_for_subjects` + role-bundle filter.
         self.trash_repository.clear_trash(&[user_id]).await
     }
+
+    async fn empty_trash_for_drive(&self, _user_id: Uuid, drive_id: Uuid) -> Result<()> {
+        // Test mock — uses the passed-in drive id verbatim. Production
+        // checks the caller's Delete-bearing drives first and refuses
+        // with NotFound on a mismatch; the mock skips that and just
+        // clears the given drive directly.
+        self.trash_repository.clear_trash(&[drive_id]).await
+    }
 }
 
 // Mock repositories for testing

src/interfaces/api/handlers/trash_handler.rs

@@ -405,3 +405,61 @@ pub async fn empty_trash(
         }
     }
 }
+
+/// `DELETE /api/trash/drive/{drive_id}` — per-drive empty trash.
+///
+/// Same destructive shape as the all-drives `DELETE /api/trash`, but
+/// scoped to a single drive the caller can Delete in. Used by the
+/// `/trash` page's Drive group-by, which exposes a per-row "Empty"
+/// affordance so multi-drive owners don't have to wipe everything at
+/// once.
+///
+/// Refused with `404` (anti-enum) when the caller has no Delete-bearing
+/// role on the named drive — the user-facing drive listing would emit
+/// the same shape for an unknown id.
+#[utoipa::path(
+    delete,
+    path = "/api/trash/drive/{drive_id}",
+    params(("drive_id" = Uuid, Path, description = "Drive UUID")),
+    responses(
+        (status = 200, description = "Drive trash emptied successfully"),
+        (status = 404, description = "Caller lacks Delete on this drive"),
+        (status = 501, description = "Trash feature not enabled"),
+    ),
+    security(("bearerAuth" = [])),
+    tag = "trash"
+)]
+#[instrument(skip_all)]
+pub async fn empty_trash_for_drive(
+    State(state): State<Arc<AppState>>,
+    auth_user: AuthUser,
+    Path(drive_id): Path<uuid::Uuid>,
+) -> impl IntoResponse {
+    debug!(
+        "Request to empty trash for drive {} by user {}",
+        drive_id, auth_user.id
+    );
+
+    let trash_service = match state.trash_service.as_ref() {
+        Some(service) => service,
+        None => {
+            return (
+                StatusCode::NOT_IMPLEMENTED,
+                Json(json!({ "error": "Trash feature is not enabled" })),
+            )
+                .into_response();
+        }
+    };
+
+    match trash_service
+        .empty_trash_for_drive(auth_user.id, drive_id)
+        .await
+    {
+        Ok(_) => (
+            StatusCode::OK,
+            Json(json!({ "success": true, "drive_id": drive_id })),
+        )
+            .into_response(),
+        Err(e) => AppError::from(e).into_response(),
+    }
+}

src/interfaces/api/routes.rs

@@ -469,6 +469,13 @@ pub fn create_api_routes(app_state: &Arc<AppState>) -> Router<Arc<AppState>> {
             // when a wildcard like /{id} could otherwise capture them.
             .route("/resources", get(trash_handler::get_trash_resources))
             .route("/empty", delete(trash_handler::empty_trash))
+            // Per-drive empty (D2b stage 4 / per-drive UX). Scoped
+            // empty of one drive's trash; refused 404 when the caller
+            // lacks Delete on the named drive.
+            .route(
+                "/drive/{drive_id}",
+                delete(trash_handler::empty_trash_for_drive),
+            )
             .route("/files/{id}", delete(trash_handler::move_file_to_trash))
             .route("/folders/{id}", delete(trash_handler::move_folder_to_trash))
             .route("/{id}/restore", post(trash_handler::restore_from_trash))

tests/api/run.sh

@@ -160,7 +160,8 @@ hurl --variables-file "$API_DIR/test.env" --file-root "$REPO_ROOT/tests" --test
   "$API_DIR/admin_user_ops.hurl" \
   "$API_DIR/chunked_upload_cap.hurl" \
   "$API_DIR/nc_auth_failures.hurl" \
-  "$API_DIR/dedup_create.hurl"
+  "$API_DIR/dedup_create.hurl" \
+  "$API_DIR/trash_per_drive.hurl"
 
 #bash "$API_DIR/dedup_bulk_upload.sh"
 

tests/api/trash_per_drive.hurl

@@ -0,0 +1,332 @@
+# =============================================================
+# OxiCloud — Per-drive trash empty (D2b stage 4 follow-up)
+# =============================================================
+# Pins the contract on `DELETE /api/trash/drive/{drive_id}` — the
+# per-drive variant of `DELETE /api/trash/empty`. Scope of coverage:
+#
+#   1. Owner of a drive CAN empty that drive's trash → 204.
+#   2. Idempotent: calling again on an empty drive still returns 204.
+#   3. Scope: emptying drive A leaves drive B's trash intact.
+#   4. Viewer of a shared drive → 404 (Viewer's bundle has no Delete).
+#   5. Editor of a shared drive → 404 (Editor's bundle has no Delete).
+#   6. Non-member of a shared drive → 404 (anti-enum).
+#   7. Unknown drive UUID → 404 (same shape as no-role case; can't
+#      enumerate drive existence through this endpoint).
+#
+# The owner gate has three layers in the implementation (filter,
+# membership check, UI hide); cases 4-6 protect the first two. Test 3
+# (scope) is the load-bearing assertion against a regression that
+# silently merges scopes.
+#
+# Self-contained: provisions its own users (`tpd_*` prefix) so it
+# survives running alongside the rest of the API test suite.
+# =============================================================
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 1 — Admin login.
+# ─────────────────────────────────────────────────────────────
+POST {{base_url}}/api/auth/login
+Content-Type: application/json
+{ "username": "{{username}}", "password": "{{password}}" }
+
+HTTP 200
+[Captures]
+admin_token: jsonpath "$.access_token"
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 2 — Provision `tpd_owner` (will own the shared drive and a
+#          personal-drive trash item that must NOT be touched).
+# ─────────────────────────────────────────────────────────────
+POST {{base_url}}/api/admin/users
+Authorization: Bearer {{admin_token}}
+Content-Type: application/json
+{
+  "username": "tpd_owner",
+  "password": "TpdOwnerPwd1!",
+  "email":    "tpd_owner@example.com",
+  "role":     "user"
+}
+
+HTTP 201
+[Captures]
+owner_user_id: jsonpath "$.id"
+
+POST {{base_url}}/api/auth/login
+Content-Type: application/json
+{ "username": "tpd_owner", "password": "TpdOwnerPwd1!" }
+
+HTTP 200
+[Captures]
+owner_token: jsonpath "$.access_token"
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 3 — Capture the owner's default-personal drive + its root.
+# ─────────────────────────────────────────────────────────────
+GET {{base_url}}/api/drives
+Authorization: Bearer {{owner_token}}
+
+HTTP 200
+[Asserts]
+jsonpath "$" count == 1
+jsonpath "$[0].default_for_user" == "{{owner_user_id}}"
+[Captures]
+personal_drive_id: jsonpath "$[0].id"
+personal_root_id:  jsonpath "$[0].root_folder_id"
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 4 — Admin creates a shared drive owned directly by `tpd_owner`.
+#          Direct-user-owner keeps the test self-contained (no group
+#          plumbing needed); the membership-API path is exercised
+#          separately by `drives_membership.hurl`.
+# ─────────────────────────────────────────────────────────────
+POST {{base_url}}/api/drives
+Authorization: Bearer {{admin_token}}
+Content-Type: application/json
+{
+  "kind": "shared",
+  "name": "tpd-shared",
+  "owner": { "type": "user", "id": "{{owner_user_id}}" }
+}
+
+HTTP 201
+[Captures]
+shared_drive_id: jsonpath "$.id"
+shared_root_id:  jsonpath "$.root_folder_id"
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 5 — Seed one file in each drive, then trash both. We end up
+#          with two trash entries the owner can see: one per drive.
+# ─────────────────────────────────────────────────────────────
+POST {{base_url}}/api/files/upload
+Authorization: Bearer {{owner_token}}
+[MultipartFormData]
+folder_id: {{personal_root_id}}
+file: file,fixtures/hello.txt; text/plain
+
+HTTP 201
+[Captures]
+personal_file_id: jsonpath "$.id"
+
+
+POST {{base_url}}/api/files/upload
+Authorization: Bearer {{owner_token}}
+[MultipartFormData]
+folder_id: {{shared_root_id}}
+file: file,fixtures/hello-copy.txt; text/plain
+
+HTTP 201
+[Captures]
+shared_file_id: jsonpath "$.id"
+
+
+DELETE {{base_url}}/api/files/{{personal_file_id}}
+Authorization: Bearer {{owner_token}}
+
+HTTP 204
+
+
+DELETE {{base_url}}/api/files/{{shared_file_id}}
+Authorization: Bearer {{owner_token}}
+
+HTTP 204
+
+
+# Both files are now trashed; trash listing carries one row per drive.
+GET {{base_url}}/api/trash/resources
+Authorization: Bearer {{owner_token}}
+
+HTTP 200
+[Asserts]
+jsonpath "$.items[*].drive_id" contains "{{personal_drive_id}}"
+jsonpath "$.items[*].drive_id" contains "{{shared_drive_id}}"
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 6 — Test 1 + Test 3: Owner empties the shared drive's trash;
+#          the personal drive's trash item is untouched (scope check).
+# ─────────────────────────────────────────────────────────────
+DELETE {{base_url}}/api/trash/drive/{{shared_drive_id}}
+Authorization: Bearer {{owner_token}}
+
+HTTP 200
+
+
+GET {{base_url}}/api/trash/resources
+Authorization: Bearer {{owner_token}}
+
+HTTP 200
+[Asserts]
+jsonpath "$.items[*].drive_id" contains "{{personal_drive_id}}"
+jsonpath "$.items[*].drive_id" not contains "{{shared_drive_id}}"
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 7 — Test 2: idempotent on an already-empty drive.
+#          No trash items left in the shared drive, but the owner
+#          still holds Delete on it, so the response is 200.
+# ─────────────────────────────────────────────────────────────
+DELETE {{base_url}}/api/trash/drive/{{shared_drive_id}}
+Authorization: Bearer {{owner_token}}
+
+HTTP 200
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 8 — Test 7: unknown drive id → 404.
+#          The endpoint refuses with the same shape it uses for "no
+#          Delete on this drive" so callers can't enumerate which
+#          drive UUIDs exist via this endpoint.
+# ─────────────────────────────────────────────────────────────
+DELETE {{base_url}}/api/trash/drive/00000000-0000-0000-0000-000000000000
+Authorization: Bearer {{owner_token}}
+
+HTTP 404
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 9 — Provision a Viewer of the shared drive (`tpd_viewer`),
+#          then assert the per-drive empty refuses for Viewer / Editor
+#          / non-member callers. Each refusal is 404 (anti-enum).
+# ─────────────────────────────────────────────────────────────
+POST {{base_url}}/api/admin/users
+Authorization: Bearer {{admin_token}}
+Content-Type: application/json
+{
+  "username": "tpd_viewer",
+  "password": "TpdViewerPwd1!",
+  "email":    "tpd_viewer@example.com",
+  "role":     "user"
+}
+
+HTTP 201
+[Captures]
+viewer_user_id: jsonpath "$.id"
+
+POST {{base_url}}/api/auth/login
+Content-Type: application/json
+{ "username": "tpd_viewer", "password": "TpdViewerPwd1!" }
+
+HTTP 200
+[Captures]
+viewer_token: jsonpath "$.access_token"
+
+
+# Owner grants Viewer role on the shared drive.
+POST {{base_url}}/api/drives/{{shared_drive_id}}/members
+Authorization: Bearer {{owner_token}}
+Content-Type: application/json
+{
+  "subject": { "type": "user", "id": "{{viewer_user_id}}" },
+  "role": "viewer"
+}
+
+HTTP 201
+
+
+# Seed a trash item in the shared drive so the negative tests can't
+# pass via the "drive happens to be empty" trivial path. The owner
+# trashes a new file; the Viewer/Editor/non-member attempts that
+# follow must still refuse — the scope check is on permission, not
+# on whether work would be done.
+POST {{base_url}}/api/files/upload
+Authorization: Bearer {{owner_token}}
+[MultipartFormData]
+folder_id: {{shared_root_id}}
+file: file,fixtures/hello.txt; text/plain
+
+HTTP 201
+[Captures]
+canary_file_id: jsonpath "$.id"
+
+DELETE {{base_url}}/api/files/{{canary_file_id}}
+Authorization: Bearer {{owner_token}}
+
+HTTP 204
+
+
+# Test 4 — Viewer cannot empty the drive's trash.
+DELETE {{base_url}}/api/trash/drive/{{shared_drive_id}}
+Authorization: Bearer {{viewer_token}}
+
+HTTP 404
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 10 — Test 5: Editor cannot either.
+#           Promote tpd_viewer to Editor; same refusal. Confirms
+#           `Delete` isn't in the Editor bundle.
+# ─────────────────────────────────────────────────────────────
+PATCH {{base_url}}/api/drives/{{shared_drive_id}}/members/user/{{viewer_user_id}}
+Authorization: Bearer {{owner_token}}
+Content-Type: application/json
+{ "role": "editor" }
+
+HTTP 200
+
+
+DELETE {{base_url}}/api/trash/drive/{{shared_drive_id}}
+Authorization: Bearer {{viewer_token}}
+
+HTTP 404
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 11 — Test 6: non-member of the drive cannot empty its trash.
+#           Fresh user with no grant on the shared drive whatsoever.
+# ─────────────────────────────────────────────────────────────
+POST {{base_url}}/api/admin/users
+Authorization: Bearer {{admin_token}}
+Content-Type: application/json
+{
+  "username": "tpd_outsider",
+  "password": "TpdOutsiderPwd1!",
+  "email":    "tpd_outsider@example.com",
+  "role":     "user"
+}
+
+HTTP 201
+
+POST {{base_url}}/api/auth/login
+Content-Type: application/json
+{ "username": "tpd_outsider", "password": "TpdOutsiderPwd1!" }
+
+HTTP 200
+[Captures]
+outsider_token: jsonpath "$.access_token"
+
+
+DELETE {{base_url}}/api/trash/drive/{{shared_drive_id}}
+Authorization: Bearer {{outsider_token}}
+
+HTTP 404
+
+
+# Trash row is still there — none of the negative attempts purged it.
+GET {{base_url}}/api/trash/resources
+Authorization: Bearer {{owner_token}}
+
+HTTP 200
+[Asserts]
+jsonpath "$.items[*].drive_id" contains "{{shared_drive_id}}"
+
+
+# ─────────────────────────────────────────────────────────────
+# Step 12 — Cleanup: drop the canary, then the shared drive itself
+#           (D3b's delete-drive guard refuses non-empty drives, so
+#           clearing trash + the live tree first is required).
+# ─────────────────────────────────────────────────────────────
+DELETE {{base_url}}/api/trash/drive/{{shared_drive_id}}
+Authorization: Bearer {{owner_token}}
+
+HTTP 200
+
+
+DELETE {{base_url}}/api/drives/{{shared_drive_id}}
+Authorization: Bearer {{owner_token}}
+
+HTTP 204