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-rw-r--r--synapse/rest/admin/__init__.py2
-rw-r--r--synapse/rest/admin/users.py67
-rw-r--r--synapse/storage/databases/main/events_bg_updates.py7
-rw-r--r--synapse/storage/databases/main/media_repository.py51
-rw-r--r--synapse/storage/databases/main/schema/delta/58/22users_have_local_media.sql2
5 files changed, 128 insertions, 1 deletions
diff --git a/synapse/rest/admin/__init__.py b/synapse/rest/admin/__init__.py
index df14bdf26e..a79996cae1 100644
--- a/synapse/rest/admin/__init__.py
+++ b/synapse/rest/admin/__init__.py
@@ -53,6 +53,7 @@ from synapse.rest.admin.users import (
     ResetPasswordRestServlet,
     SearchUsersRestServlet,
     UserAdminServlet,
+    UserMediaRestServlet,
     UserMembershipRestServlet,
     UserRegisterServlet,
     UserRestServletV2,
@@ -218,6 +219,7 @@ def register_servlets(hs, http_server):
     SendServerNoticeServlet(hs).register(http_server)
     VersionServlet(hs).register(http_server)
     UserAdminServlet(hs).register(http_server)
+    UserMediaRestServlet(hs).register(http_server)
     UserMembershipRestServlet(hs).register(http_server)
     UserRestServletV2(hs).register(http_server)
     UsersRestServletV2(hs).register(http_server)
diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py
index e71d9b0e1c..933bb45346 100644
--- a/synapse/rest/admin/users.py
+++ b/synapse/rest/admin/users.py
@@ -16,6 +16,7 @@ import hashlib
 import hmac
 import logging
 from http import HTTPStatus
+from typing import Tuple
 
 from synapse.api.constants import UserTypes
 from synapse.api.errors import Codes, NotFoundError, SynapseError
@@ -27,13 +28,14 @@ from synapse.http.servlet import (
     parse_json_object_from_request,
     parse_string,
 )
+from synapse.http.site import SynapseRequest
 from synapse.rest.admin._base import (
     admin_patterns,
     assert_requester_is_admin,
     assert_user_is_admin,
     historical_admin_path_patterns,
 )
-from synapse.types import UserID
+from synapse.types import JsonDict, UserID
 
 logger = logging.getLogger(__name__)
 
@@ -709,3 +711,66 @@ class UserMembershipRestServlet(RestServlet):
         room_ids = await self.store.get_rooms_for_user(user_id)
         ret = {"joined_rooms": list(room_ids), "total": len(room_ids)}
         return 200, ret
+
+
+class UserMediaRestServlet(RestServlet):
+    """
+    Gets information about all uploaded local media for a specific `user_id`.
+
+    Example:
+        http://localhost:8008/_synapse/admin/v1/users/
+        @user:server/media
+
+    Args:
+        The parameters `from` and `limit` are required for pagination.
+        By default, a `limit` of 100 is used.
+    Returns:
+        A list of media and an integer representing the total number of
+        media that exist given for this user
+    """
+
+    PATTERNS = admin_patterns("/users/(?P<user_id>[^/]+)/media$")
+
+    def __init__(self, hs):
+        self.is_mine = hs.is_mine
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastore()
+
+    async def on_GET(
+        self, request: SynapseRequest, user_id: str
+    ) -> Tuple[int, JsonDict]:
+        await assert_requester_is_admin(self.auth, request)
+
+        if not self.is_mine(UserID.from_string(user_id)):
+            raise SynapseError(400, "Can only lookup local users")
+
+        user = await self.store.get_user_by_id(user_id)
+        if user is None:
+            raise NotFoundError("Unknown user")
+
+        start = parse_integer(request, "from", default=0)
+        limit = parse_integer(request, "limit", default=100)
+
+        if start < 0:
+            raise SynapseError(
+                400,
+                "Query parameter from must be a string representing a positive integer.",
+                errcode=Codes.INVALID_PARAM,
+            )
+
+        if limit < 0:
+            raise SynapseError(
+                400,
+                "Query parameter limit must be a string representing a positive integer.",
+                errcode=Codes.INVALID_PARAM,
+            )
+
+        media, total = await self.store.get_local_media_by_user_paginate(
+            start, limit, user_id
+        )
+
+        ret = {"media": media, "total": total}
+        if (start + limit) < total:
+            ret["next_token"] = start + len(media)
+
+        return 200, ret
diff --git a/synapse/storage/databases/main/events_bg_updates.py b/synapse/storage/databases/main/events_bg_updates.py
index 5e4af2eb51..97b6754846 100644
--- a/synapse/storage/databases/main/events_bg_updates.py
+++ b/synapse/storage/databases/main/events_bg_updates.py
@@ -92,6 +92,13 @@ class EventsBackgroundUpdatesStore(SQLBaseStore):
             where_clause="NOT have_censored",
         )
 
+        self.db_pool.updates.register_background_index_update(
+            "users_have_local_media",
+            index_name="users_have_local_media",
+            table="local_media_repository",
+            columns=["user_id", "created_ts"],
+        )
+
     async def _background_reindex_fields_sender(self, progress, batch_size):
         target_min_stream_id = progress["target_min_stream_id_inclusive"]
         max_stream_id = progress["max_stream_id_exclusive"]
diff --git a/synapse/storage/databases/main/media_repository.py b/synapse/storage/databases/main/media_repository.py
index 7ef5f1bf2b..daf57675d8 100644
--- a/synapse/storage/databases/main/media_repository.py
+++ b/synapse/storage/databases/main/media_repository.py
@@ -116,6 +116,57 @@ class MediaRepositoryStore(MediaRepositoryBackgroundUpdateStore):
             desc="get_local_media",
         )
 
+    async def get_local_media_by_user_paginate(
+        self, start: int, limit: int, user_id: str
+    ) -> Tuple[List[Dict[str, Any]], int]:
+        """Get a paginated list of metadata for a local piece of media
+        which an user_id has uploaded
+
+        Args:
+            start: offset in the list
+            limit: maximum amount of media_ids to retrieve
+            user_id: fully-qualified user id
+        Returns:
+            A paginated list of all metadata of user's media,
+            plus the total count of all the user's media
+        """
+
+        def get_local_media_by_user_paginate_txn(txn):
+
+            args = [user_id]
+            sql = """
+                SELECT COUNT(*) as total_media
+                FROM local_media_repository
+                WHERE user_id = ?
+            """
+            txn.execute(sql, args)
+            count = txn.fetchone()[0]
+
+            sql = """
+                SELECT
+                    "media_id",
+                    "media_type",
+                    "media_length",
+                    "upload_name",
+                    "created_ts",
+                    "last_access_ts",
+                    "quarantined_by",
+                    "safe_from_quarantine"
+                FROM local_media_repository
+                WHERE user_id = ?
+                ORDER BY created_ts DESC, media_id DESC
+                LIMIT ? OFFSET ?
+            """
+
+            args += [limit, start]
+            txn.execute(sql, args)
+            media = self.db_pool.cursor_to_dict(txn)
+            return media, count
+
+        return await self.db_pool.runInteraction(
+            "get_local_media_by_user_paginate_txn", get_local_media_by_user_paginate_txn
+        )
+
     async def get_local_media_before(
         self, before_ts: int, size_gt: int, keep_profiles: bool,
     ) -> Optional[List[str]]:
diff --git a/synapse/storage/databases/main/schema/delta/58/22users_have_local_media.sql b/synapse/storage/databases/main/schema/delta/58/22users_have_local_media.sql
new file mode 100644
index 0000000000..a2842687f1
--- /dev/null
+++ b/synapse/storage/databases/main/schema/delta/58/22users_have_local_media.sql
@@ -0,0 +1,2 @@
+INSERT INTO background_updates (update_name, progress_json) VALUES
+  ('users_have_local_media', '{}');
\ No newline at end of file