Continue AI features and improve protocol support

core/messaging/media_bridge.py

@@ -0,0 +1,48 @@
+import base64
+import hashlib
+import time
+
+from django.core.cache import cache
+
+
+DEFAULT_BLOB_TTL_SECONDS = 60 * 20
+
+
+def _blob_cache_key(service, digest):
+    return f"gia:media:{service}:{digest}"
+
+
+def put_blob(service, content, filename, content_type, ttl=DEFAULT_BLOB_TTL_SECONDS):
+    if not content:
+        return None
+    digest = hashlib.sha1(content).hexdigest()
+    key = _blob_cache_key(service, digest)
+    cache.set(
+        key,
+        {
+            "filename": filename or "attachment.bin",
+            "content_type": content_type or "application/octet-stream",
+            "content_b64": base64.b64encode(content).decode("utf-8"),
+            "size": len(content),
+            "stored_at": int(time.time()),
+        },
+        timeout=ttl,
+    )
+    return key
+
+
+def get_blob(key):
+    row = cache.get(key)
+    if not row:
+        return None
+    try:
+        content = base64.b64decode(row.get("content_b64", ""))
+    except Exception:
+        return None
+    return {
+        "content": content,
+        "filename": row.get("filename") or "attachment.bin",
+        "content_type": row.get("content_type") or "application/octet-stream",
+        "size": row.get("size") or len(content),
+        "stored_at": row.get("stored_at"),
+    }