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-rw-r--r--synapse/rest/media/v1/identicon_resource.py6
-rw-r--r--synapse/rest/media/v1/preview_url_resource.py5
-rw-r--r--synapse/rest/media/v1/upload_resource.py5
3 files changed, 10 insertions, 6 deletions
diff --git a/synapse/rest/media/v1/identicon_resource.py b/synapse/rest/media/v1/identicon_resource.py
index a2e391415f..b3217eff53 100644
--- a/synapse/rest/media/v1/identicon_resource.py
+++ b/synapse/rest/media/v1/identicon_resource.py
@@ -14,6 +14,8 @@
 
 from pydenticon import Generator
 
+from synapse.http.servlet import parse_integer
+
 from twisted.web.resource import Resource
 
 FOREGROUND = [
@@ -56,8 +58,8 @@ class IdenticonResource(Resource):
 
     def render_GET(self, request):
         name = "/".join(request.postpath)
-        width = int(request.args.get("width", [96])[0])
-        height = int(request.args.get("height", [96])[0])
+        width = parse_integer(request, "width", default=96)
+        height = parse_integer(request, "height", default=96)
         identicon_bytes = self.generate_identicon(name, width, height)
         request.setHeader(b"Content-Type", b"image/png")
         request.setHeader(
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 4e3a18ce08..b70b15c4c2 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -40,6 +40,7 @@ from synapse.http.server import (
     respond_with_json_bytes,
     wrap_json_request_handler,
 )
+from synapse.http.servlet import parse_integer, parse_string
 from synapse.util.async import ObservableDeferred
 from synapse.util.caches.expiringcache import ExpiringCache
 from synapse.util.logcontext import make_deferred_yieldable, run_in_background
@@ -96,9 +97,9 @@ class PreviewUrlResource(Resource):
 
         # XXX: if get_user_by_req fails, what should we do in an async render?
         requester = yield self.auth.get_user_by_req(request)
-        url = request.args.get("url")[0]
+        url = parse_string(request, "url")
         if "ts" in request.args:
-            ts = int(request.args.get("ts")[0])
+            ts = parse_integer(request, "ts")
         else:
             ts = self.clock.time_msec()
 
diff --git a/synapse/rest/media/v1/upload_resource.py b/synapse/rest/media/v1/upload_resource.py
index 1a98120e1d..9b22d204a6 100644
--- a/synapse/rest/media/v1/upload_resource.py
+++ b/synapse/rest/media/v1/upload_resource.py
@@ -21,6 +21,7 @@ from twisted.web.server import NOT_DONE_YET
 
 from synapse.api.errors import SynapseError
 from synapse.http.server import respond_with_json, wrap_json_request_handler
+from synapse.http.servlet import parse_string
 
 logger = logging.getLogger(__name__)
 
@@ -65,10 +66,10 @@ class UploadResource(Resource):
                 code=413,
             )
 
-        upload_name = request.args.get("filename", None)
+        upload_name = parse_string(request, "filename")
         if upload_name:
             try:
-                upload_name = upload_name[0].decode('UTF-8')
+                upload_name = upload_name.decode('UTF-8')
             except UnicodeDecodeError:
                 raise SynapseError(
                     msg="Invalid UTF-8 filename parameter: %r" % (upload_name),