diff --git a/synapse/rest/media/upload_resource.py b/synapse/rest/media/upload_resource.py
new file mode 100644
index 0000000000..697348613b
--- /dev/null
+++ b/synapse/rest/media/upload_resource.py
@@ -0,0 +1,108 @@
+# Copyright 2014-2016 OpenMarket Ltd
+# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+from typing import IO, TYPE_CHECKING, Dict, List, Optional
+
+from synapse.api.errors import Codes, SynapseError
+from synapse.http.server import DirectServeJsonResource, respond_with_json
+from synapse.http.servlet import parse_bytes_from_args
+from synapse.http.site import SynapseRequest
+from synapse.media.media_storage import SpamMediaException
+
+if TYPE_CHECKING:
+ from synapse.media.media_repository import MediaRepository
+ from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+class UploadResource(DirectServeJsonResource):
+ isLeaf = True
+
+ def __init__(self, hs: "HomeServer", media_repo: "MediaRepository"):
+ super().__init__()
+
+ self.media_repo = media_repo
+ self.filepaths = media_repo.filepaths
+ self.store = hs.get_datastores().main
+ self.clock = hs.get_clock()
+ self.server_name = hs.hostname
+ self.auth = hs.get_auth()
+ self.max_upload_size = hs.config.media.max_upload_size
+ self.clock = hs.get_clock()
+
+ async def _async_render_OPTIONS(self, request: SynapseRequest) -> None:
+ respond_with_json(request, 200, {}, send_cors=True)
+
+ async def _async_render_POST(self, request: SynapseRequest) -> None:
+ requester = await self.auth.get_user_by_req(request)
+ raw_content_length = request.getHeader("Content-Length")
+ if raw_content_length is None:
+ raise SynapseError(msg="Request must specify a Content-Length", code=400)
+ try:
+ content_length = int(raw_content_length)
+ except ValueError:
+ raise SynapseError(msg="Content-Length value is invalid", code=400)
+ if content_length > self.max_upload_size:
+ raise SynapseError(
+ msg="Upload request body is too large",
+ code=413,
+ errcode=Codes.TOO_LARGE,
+ )
+
+ args: Dict[bytes, List[bytes]] = request.args # type: ignore
+ upload_name_bytes = parse_bytes_from_args(args, "filename")
+ if upload_name_bytes:
+ try:
+ upload_name: Optional[str] = upload_name_bytes.decode("utf8")
+ except UnicodeDecodeError:
+ raise SynapseError(
+ msg="Invalid UTF-8 filename parameter: %r" % (upload_name_bytes,),
+ code=400,
+ )
+
+ # If the name is falsey (e.g. an empty byte string) ensure it is None.
+ else:
+ upload_name = None
+
+ headers = request.requestHeaders
+
+ if headers.hasHeader(b"Content-Type"):
+ content_type_headers = headers.getRawHeaders(b"Content-Type")
+ assert content_type_headers # for mypy
+ media_type = content_type_headers[0].decode("ascii")
+ else:
+ media_type = "application/octet-stream"
+
+ # if headers.hasHeader(b"Content-Disposition"):
+ # disposition = headers.getRawHeaders(b"Content-Disposition")[0]
+ # TODO(markjh): parse content-dispostion
+
+ try:
+ content: IO = request.content # type: ignore
+ content_uri = await self.media_repo.create_content(
+ media_type, upload_name, content, content_length, requester.user
+ )
+ except SpamMediaException:
+ # For uploading of media we want to respond with a 400, instead of
+ # the default 404, as that would just be confusing.
+ raise SynapseError(400, "Bad content")
+
+ logger.info("Uploaded content with URI '%s'", content_uri)
+
+ respond_with_json(
+ request, 200, {"content_uri": str(content_uri)}, send_cors=True
+ )
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