Expose user avatar URL field in the UI

To be able to change a avatar the URL field needs to be exposed but
changing the URL alone is difficult. This patch adds a image upload
field to the edit view of a user. If there is a file detected it
uploads it to the servers media repository and sets that new URL
as the avatar URL one. This way a admin can change any users avatar
which is especially nice for bridged users like in the IRC bridge
and bots.

src/components/users.js

@@ -36,6 +36,8 @@ import {
   ExportButton,
   TopToolbar,
   sanitizeListRestProps,
+  ImageInput,
+  ImageField,
 } from "react-admin";
 import { ServerNoticeButton, ServerNoticeBulkButton } from "./ServerNotices";
 import { DeviceRemoveButton } from "./devices";
@@ -221,6 +223,9 @@ export const UserEdit = props => {
           <TextInput source="id" disabled />
           <TextInput source="displayname" />
           <PasswordInput source="password" autoComplete="new-password" />
+          <ImageInput source="avatar_file" label="Avatar" accept="image/*">
+            <ImageField source="avatar_src" title="Avatar" />
+          </ImageInput>
           <BooleanInput source="admin" />
           <BooleanInput
             source="deactivated"

src/synapse/dataProvider.js

@@ -32,6 +32,7 @@ const resourceMap = {
       ...u,
       id: u.name,
       avatar_src: mxcUrlToHttp(u.avatar_url),
+      avatar_url: u.avatar_url,
       is_guest: !!u.is_guest,
       admin: !!u.admin,
       deactivated: !!u.deactivated,
@@ -202,12 +203,38 @@ const dataProvider = {
     const res = resourceMap[resource];
 
     const endpoint_url = homeserver + res.path;
-    return jsonClient(`${endpoint_url}/${params.data.id}`, {
-      method: "PUT",
-      body: JSON.stringify(params.data, filterNullValues),
-    }).then(({ json }) => ({
-      data: res.map(json),
-    }));
+
+    // In case there is a avatar_file object, save it in the media repository
+    // and update the avatar_url.
+    const f = params?.data?.avatar_file?.rawFile;
+    if (f instanceof File) {
+      const file_endpoint =
+        homeserver + "/_matrix/media/r0/upload?filename=" + f.name;
+      const headers = new Headers();
+      headers.append("Content-Type", f.type);
+      const options = {
+        method: "POST",
+        body: f,
+        headers: headers,
+      };
+      return jsonClient(file_endpoint, options).then(r => {
+        params.data.avatar_url = r.json.content_uri;
+
+        return jsonClient(`${endpoint_url}/${params.data.id}`, {
+          method: "PUT",
+          body: JSON.stringify(params.data, filterNullValues),
+        }).then(({ json }) => ({
+          data: res.map(json),
+        }));
+      });
+    } else {
+      return jsonClient(`${endpoint_url}/${params.data.id}`, {
+        method: "PUT",
+        body: JSON.stringify(params.data, filterNullValues),
+      }).then(({ json }) => ({
+        data: res.map(json),
+      }));
+    }
   },
 
   updateMany: (resource, params) => {