Update avatar.

src/snek/view/avatar.py

@@ -24,7 +24,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 from multiavatar import multiavatar
-
+import uuid
 from aiohttp import web
 from snek.system.view import BaseView
 
@@ -33,6 +33,8 @@ class AvatarView(BaseView):
 
     async def get(self):
         uid = self.request.match_info.get("uid")
+        if uid == "unique":
+            uid = str(uuid.uuid4())
         avatar = multiavatar.multiavatar(uid,None, None)
         response = web.Response(text=avatar, content_type='image/svg+xml')
         response.headers['Cache-Control'] = f'public, max-age={1337*42}'