Add support for displaying prosody version

This only works for authenticated users even in debug mode because
it requires a session with prosody to send the request.

Fixes #66.

snikket_web/main.py

@@ -101,6 +101,10 @@ async def about() -> str:
         extra_versions["babel"] = babel.__version__
         extra_versions["wtforms"] = wtforms.__version__
         extra_versions["flask-wtf"] = flask_wtf.__version__
+        try:
+            extra_versions["Prosody"] = await client.get_server_version()
+        except quart.exceptions.Unauthorized:
+            extra_versions["Prosody"] = "unknown"
 
     return await render_template(
         "about.html",

snikket_web/prosodyclient.py

@@ -503,6 +503,22 @@ class ProsodyClient:
         async with session.post(self._rest_endpoint, data=req) as resp:
             return resp.status == 200
 
+    @autosession
+    async def get_server_version(self, session: aiohttp.ClientSession) -> str:
+        _, domain, _ = split_jid(self.session_address)
+        req = {
+            "kind": "iq",
+            "type": "get",
+            "version": True,
+            "to": domain,
+        }
+
+        async with session.post(self._rest_endpoint, data=req) as resp:
+            try:
+                return (await resp.json())["version"]["version"]
+            except:
+                return "unknown"
+
     @autosession
     async def get_user_nickname(
             self,