Adding a Pusher container as a middleware/dispatcher between front and back

docs/diagrams.md

@@ -0,0 +1,27 @@
+Diagrams are rendered with "mermaid.js"
+
+sequenceDiagram
+    participant Br as Browser
+    participant P as Pusher
+    participant Ba as Back
+    participant A as Admin
+    Note left of Br: The user has a JWT token
+    Br->>P: /verify: verify the token (no answer)
+    P->>A: /api/check-user: the user must not be banned
+    A->>P: 200 (no body)
+    P->>Br: 200 (no body)
+    Br->>P: connect to websocket /room?roomid=...
+    P->>A: /api/check-user(uuid): the user must not be banned
+    A->>P: 200 (no body)
+    P->>A: /api/membership(uuid): get data from the user
+    A->>P: 200 (user data)
+    Note right of P: Zones are computed on Pusher
+    P->>Ba: doJoinRoom + list of listened zones
+    Ba->>P: RoomJoinedMessage
+    P->>Br: RoomJoinedMessage (users/groups/items/current user id)
+    P->>A: /api/membership(uuid): get data from the user (again!)
+    A->>P: 200 (user data)
+    P->>Br: SendUserMessage (if any message to send)
+
+    
+