Add IPFS CID support for asset lookup

- Upload endpoint returns both CID and content_hash
- Cache manager handles both SHA3-256 hashes and IPFS CIDs
- get_by_cid() fetches from IPFS if not cached locally
- Execute tasks support :cid in addition to :hash

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/routers/cache.py

@@ -209,9 +209,9 @@ async def upload_content(
     ctx: UserContext = Depends(require_auth),
     cache_service: CacheService = Depends(get_cache_service),
 ):
-    """Upload content to cache."""
+    """Upload content to cache and IPFS."""
     content = await file.read()
-    content_hash, error = await cache_service.upload_content(
+    content_hash, ipfs_cid, error = await cache_service.upload_content(
         content=content,
         filename=file.filename,
         actor_id=ctx.actor_id,
@@ -221,7 +221,8 @@ async def upload_content(
         raise HTTPException(400, error)
 
     return {
-        "content_hash": content_hash,
+        "cid": ipfs_cid,
+        "content_hash": content_hash,  # Legacy, for backwards compatibility
         "filename": file.filename,
         "size": len(content),
         "uploaded": True,

app/services/cache_service.py

@@ -453,8 +453,8 @@ class CacheService:
         content: bytes,
         filename: str,
         actor_id: str,
-    ) -> Tuple[Optional[str], Optional[str]]:
-        """Upload content to cache. Returns (content_hash, error)."""
+    ) -> Tuple[Optional[str], Optional[str], Optional[str]]:
+        """Upload content to cache. Returns (content_hash, ipfs_cid, error)."""
         import tempfile
 
         try:
@@ -466,7 +466,7 @@ class CacheService:
             # Detect MIME type before moving file
             mime_type = get_mime_type(tmp_path)
 
-            # Store in cache
+            # Store in cache (also stores in IPFS)
             cached, ipfs_cid = self.cache.put(tmp_path, node_type="upload", move=True)
             content_hash = cached.content_hash
 
@@ -479,9 +479,9 @@ class CacheService:
                 filename=filename
             )
 
-            return content_hash, None
+            return content_hash, ipfs_cid, None
         except Exception as e:
-            return None, f"Upload failed: {e}"
+            return None, None, f"Upload failed: {e}"
 
     async def list_media(
         self,

cache_manager.py

@@ -427,8 +427,17 @@ class L1CacheManager:
         """Get cached file path by node_id."""
         return self.cache.get(node_id)
 
+    def _is_ipfs_cid(self, identifier: str) -> bool:
+        """Check if identifier looks like an IPFS CID."""
+        # CIDv0 starts with "Qm", CIDv1 starts with "bafy" or other multibase prefixes
+        return identifier.startswith("Qm") or identifier.startswith("bafy") or identifier.startswith("baf")
+
     def get_by_content_hash(self, content_hash: str) -> Optional[Path]:
-        """Get cached file path by content_hash. Falls back to IPFS if not in local cache."""
+        """Get cached file path by content_hash or IPFS CID. Falls back to IPFS if not in local cache."""
+
+        # If it looks like an IPFS CID, use get_by_cid instead
+        if self._is_ipfs_cid(content_hash):
+            return self.get_by_cid(content_hash)
 
         # Check index first (Redis then local)
         node_id = self._get_content_index(content_hash)
@@ -469,6 +478,32 @@ class L1CacheManager:
 
         return None
 
+    def get_by_cid(self, ipfs_cid: str) -> Optional[Path]:
+        """Get cached file path by IPFS CID. Fetches from IPFS if not in local cache."""
+
+        # Check if we have this CID cached locally (indexed by CID)
+        cached_path = self.legacy_dir / ipfs_cid
+        if cached_path.exists() and cached_path.is_file():
+            return cached_path
+
+        # Check cache directory structure
+        cid_cache_dir = self.cache_dir / ipfs_cid
+        if cid_cache_dir.exists() and cid_cache_dir.is_dir():
+            # Look for output file
+            for f in cid_cache_dir.iterdir():
+                if f.is_file() and not f.name.endswith('.json'):
+                    return f
+
+        # Fetch from IPFS
+        logger.info(f"Fetching from IPFS: {ipfs_cid[:16]}...")
+        recovery_path = self.legacy_dir / ipfs_cid
+        recovery_path.parent.mkdir(parents=True, exist_ok=True)
+        if ipfs_client.get_file(ipfs_cid, recovery_path):
+            logger.info(f"Fetched from IPFS: {recovery_path}")
+            return recovery_path
+
+        return None
+
     def has_content(self, content_hash: str) -> bool:
         """Check if content exists in cache."""
         return self.get_by_content_hash(content_hash) is not None

tasks/execute_sexp.py

@@ -197,13 +197,14 @@ def execute_step_sexp(
     try:
         # Handle SOURCE nodes
         if node_type == "SOURCE":
-            content_hash = config.get("hash")
-            if not content_hash:
-                raise ValueError("SOURCE step missing :hash")
+            # Support both :cid (new IPFS) and :hash (legacy)
+            content_id = config.get("cid") or config.get("hash")
+            if not content_id:
+                raise ValueError("SOURCE step missing :cid or :hash")
 
-            path = cache_mgr.get_by_content_hash(content_hash)
+            path = cache_mgr.get_by_content_hash(content_id)
             if not path:
-                raise ValueError(f"SOURCE input not found: {content_hash[:16]}...")
+                raise ValueError(f"SOURCE input not found: {content_id[:16]}...")
 
             output_path = str(path)
             complete_task(cache_id, worker_id, output_path)