Proxy Plex through stemserve (/plex/) so HTTPS pages avoid mixed-content blocks

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

server/stemserve.py

@@ -16,6 +16,7 @@ Endpoints (all GET unless noted; add ?token=... or X-Stem-Token when TOKEN is se
   POST /api/prepare?key=<key>&fmt=opus&br=160 start transcodes in the background
   POST /api/stem  {"paths": [...]}           "Stem Now": stemd separates these Plex files next
   /file/<key>/<file>[?fmt=opus&br=160]       the stem itself, with Range support
+  /plex/...                                  proxy to PLEX_URL (needs TOKEN or the Plex token)
   /api/config                                Plex URL and token from PLEX_URL / PLEX_TOKEN, if set
   /                                           the web player (web/, or WEB_DIR); no token needed
 
@@ -33,7 +34,9 @@ import subprocess
 import sys
 import threading
 import time
+import urllib.error
 import urllib.parse
+import urllib.request
 from array import array
 from concurrent.futures import ThreadPoolExecutor
 from http import HTTPStatus
@@ -263,6 +266,31 @@ class Handler(BaseHTTPRequestHandler):
             return True
         return TOKEN in (self.headers.get("X-Stem-Token"), query.get("token", [None])[0])
 
+    def _plex_proxy(self, path, rawquery, query):
+        """Forward to PLEX_URL so an HTTPS page can reach an HTTP Plex. Needs the stem or Plex token."""
+        given = self.headers.get("X-Plex-Token") or query.get("X-Plex-Token", [None])[0]
+        if not (self._authorized(query) or (PLEX_TOKEN and given == PLEX_TOKEN)):
+            return self._error(HTTPStatus.UNAUTHORIZED, "bad token")
+        pairs = [(k, v) for k, v in urllib.parse.parse_qsl(rawquery, keep_blank_values=True) if k not in ("token", "X-Plex-Token")]
+        req = urllib.request.Request(PLEX_URL + path + ("?" + urllib.parse.urlencode(pairs) if pairs else ""))
+        req.add_header("X-Plex-Token", PLEX_TOKEN or given or "")
+        for h in ("Range", "Accept", "X-Plex-Client-Identifier", "X-Plex-Product", "If-None-Match"):
+            if self.headers.get(h):
+                req.add_header(h, self.headers[h])
+        try:
+            r = urllib.request.urlopen(req, timeout=30)
+        except urllib.error.HTTPError as e:
+            r = e
+        except OSError as e:
+            return self._error(502, f"plex unreachable: {e}")
+        self.send_response(r.status if hasattr(r, "status") else r.code)
+        for h in ("Content-Type", "Content-Length", "Content-Range", "Accept-Ranges", "ETag", "Cache-Control"):
+            if r.headers.get(h):
+                self.send_header(h, r.headers[h])
+        self.end_headers()
+        while chunk := r.read(65536):
+            self.wfile.write(chunk)
+
     def _send(self, status, body=b"", ctype="application/json", headers=None):
         self.send_response(status)
         self.send_header("Content-Type", ctype)
@@ -299,6 +327,8 @@ class Handler(BaseHTTPRequestHandler):
         url = urllib.parse.urlsplit(self.path)
         query = urllib.parse.parse_qs(url.query)
         path = urllib.parse.unquote(url.path)
+        if path.startswith("/plex/") and PLEX_URL:
+            return self._plex_proxy(path[len("/plex"):], url.query, query)
         if not path.startswith(("/api/", "/file/")):
             return self._web(path)
         if not self._authorized(query):

web/app.js

@@ -60,7 +60,7 @@ const plexHeaders = token => ({
 
 async function px(path, params = {}) {
   if (!S.plex) throw new Error("Not signed in to Plex");
-  const u = new URL(S.plex.url + path);
+  const u = new URL(S.plex.url + path, location.href);
   for (const [k, v] of Object.entries(params)) u.searchParams.set(k, v);
   const r = await fetch(u, { headers: plexHeaders(S.plex.token) });
   if (!r.ok) throw new Error(`Plex ${r.status}`);
@@ -782,7 +782,7 @@ const routes = {
     if (S.plex) secs = ((await px("/library/sections").catch(() => ({}))).Directory || []).filter(d => d.type === "artist");
     view.innerHTML = `<h1>Settings</h1>
       <h2>Plex</h2><div class="form">
-        <p class="note">${S.plex ? `Plex: <b>${esc(S.plex.name && S.plex.name !== S.plex.url ? S.plex.name + " (" + S.plex.url + ")" : S.plex.url)}</b>${S.plex.env ? " (set by the server)" : ""}` : "Not signed in."}</p>
+        <p class="note">${S.plex ? `Plex: <b>${esc(S.plex.env ? "via this server" : S.plex.name && S.plex.name !== S.plex.url ? S.plex.name + " (" + S.plex.url + ")" : S.plex.url)}</b>${S.plex.env ? " (set by the server)" : ""}` : "Not signed in."}</p>
         <div class="row"><button class="btn primary" id="signin">Sign in with Plex</button>${S.plex ? `<button class="btn" id="signout">Sign out</button>` : ""}<span class="note" id="sstatus"></span></div>
         ${secs.length > 1 ? `<label>Music library<select id="sec">${secs.map(d => `<option value="${d.key}" ${d.key == S.section ? "selected" : ""}>${esc(d.title)}</option>`).join("")}</select></label>` : ""}
         <details><summary class="note">Enter a server and token by hand</summary><div class="form" style="margin-top:12px">
@@ -850,7 +850,7 @@ async function autoConnect() {
   if (!S.plex || S.plex.env) {
     try {
       const c = await fetch(stemBase() + "/api/config" + stemQuery()).then(r => r.ok ? r.json() : null);
-      if (c?.plex) S.plex = { ...c.plex, name: "", env: true };
+      if (c?.plex) S.plex = { token: c.plex.token, url: stemBase() + "/plex", name: "", env: true };
       else if (S.plex?.env) S.plex = null;
       save();
     } catch {}