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Fix media type detection using magic bytes

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Use detect_media_type() with magic bytes instead of mimetypes.guess_type()
which requires file extensions. Cache files are stored by content hash
without extensions, so magic byte detection is needed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
gilesb
2026-01-11 23:53:40 +00:00
parent 0a82158622
commit 48faf7ee43
1 changed files with 19 additions and 7 deletions
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26
app/routers/runs.py
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@@ -157,17 +157,28 @@ async def get_run(
except Exception as e:
logger.warning(f"Failed to load recipe for plan: {e}")
# Helper to convert simple type to MIME type prefix for template
def type_to_mime(simple_type: str) -> str:
if simple_type == "video":
return "video/mp4"
elif simple_type == "image":
return "image/jpeg"
elif simple_type == "audio":
return "audio/mpeg"
return None
# Build artifacts list from output and inputs
artifacts = []
if run.get("output_hash"):
# Detect media type
# Detect media type using magic bytes
output_hash = run["output_hash"]
media_type = None
try:
cache_path = get_cache_manager().get_path(output_hash)
from ..services.run_service import detect_media_type
cache_path = get_cache_manager().get_by_content_hash(output_hash)
if cache_path and cache_path.exists():
import mimetypes
media_type, _ = mimetypes.guess_type(str(cache_path))
simple_type = detect_media_type(cache_path)
media_type = type_to_mime(simple_type)
except Exception:
pass
artifacts.append({
@@ -179,14 +190,15 @@ async def get_run(
# Build inputs list with media types
run_inputs = []
if run.get("inputs"):
import mimetypes
from ..services.run_service import detect_media_type
cache_manager = get_cache_manager()
for i, input_hash in enumerate(run["inputs"]):
media_type = None
try:
cache_path = cache_manager.get_path(input_hash)
cache_path = cache_manager.get_by_content_hash(input_hash)
if cache_path and cache_path.exists():
media_type, _ = mimetypes.guess_type(str(cache_path))
simple_type = detect_media_type(cache_path)
media_type = type_to_mime(simple_type)
except Exception:
pass
run_inputs.append({