Minamp 1.2

- Transcoding: send client identities Plex has a profile for (unknown ones get
  400 "unable to find a matching profile"), with a fresh session id per variant
- Stream proxy: fetch transcodes once into a temp file and serve every player
  request from it, so reconnects no longer restart the transcode (503s, tracks
  cut short); original files still pass Range requests through
- Sign-in: remember the pending link code so it survives Minamp being closed
  while the code is entered elsewhere; add "I've entered it - check now"
- Diagnostics: in-app connection log (DiagLog) with a streaming test and save
  to SD card; tokens are never logged

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/mock_plex.py

@@ -61,6 +61,7 @@ TOKEN = "server-token-xyz"
 ACCOUNT = "account-token-123"
 pins = {}
 log = []
+starts = []
 
 TRACKS = [
     {"type": "track", "ratingKey": "101", "key": "/library/metadata/101", "title": "Song One", "grandparentTitle": "The Testers",
@@ -141,7 +142,24 @@ class H(BaseHTTPRequestHandler):
                 {"type": "track", "title": "Tracks", "Metadata": TRACKS[:1]}]}})
         if p.startswith("/library/parts/501"):
             return self.file(method, MP3)
-        if p in ("/music/:/transcode/universal/start.mp3", "/audio/:/transcode/universal/start.mp3"):
+        if p.endswith("/transcode/universal/decision"):
+            if not self.profile_ok(q):
+                return self.send_json({"error": "unable to find a matching profile"}, 400)
+            return self.send_json({"MediaContainer": {"generalDecisionCode": 1001, "generalDecisionText": "Direct play not available; Conversion OK.",
+                                                      "transcodeDecisionCode": 1001, "transcodeDecisionText": "Transcode OK."}})
+        if p in ("/music/:/transcode/universal/start.mp3", "/audio/:/transcode/universal/start.mp3", "/audio/:/transcode/universal/start"):
+            # like a real server: unknown client identity -> 400; a session started twice -> 503
+            if not self.profile_ok(q):
+                body = b"<html><body><h1>400 Bad Request</h1></body></html>"
+                self.send_response(400)
+                self.send_header("Content-Type", "text/html")
+                self.send_header("Content-Length", str(len(body)))
+                self.end_headers()
+                return self.wfile.write(body)
+            sess = (q.get("session") or [""])[0]
+            starts.append(sess)
+            if starts.count(sess) > 1:
+                return self.send_json({"error": "session busy"}, 503)
             extra = (q.get("X-Plex-Client-Profile-Extra") or [""])[0]
             if "scopeName=*" in extra:  # pretend this server rejects that variant
                 body = b"<html><head><title>Bad Request</title></head><body><h1>400 Bad Request</h1></body></html>"
@@ -157,6 +175,11 @@ class H(BaseHTTPRequestHandler):
             return self.send_json({})
         self.send_json({"error": "not found " + p}, 404)
 
+    def profile_ok(self, q):
+        platform = (q.get("X-Plex-Platform") or [""])[0]
+        device = (q.get("X-Plex-Device") or [""])[0]
+        return platform in ("Chrome", "Linux") and device in ("", "Sonos")
+
     def file(self, method, data, ctype="audio/mpeg"):
         rng = self.headers.get("Range")
         start, end = 0, len(data) - 1