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fix(gateway): MIME type fallback for Matrix document uploads

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Cherry-picked run.py portion from PR #3495 by dlkakbs.
When Matrix sends non-image files (text, YAML, JSON, etc.), the MIME
type may be empty or application/octet-stream. Falls back to
extension-based detection so text files are properly injected into
agent context.
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dlkakbs 2026-04-05 10:48:20 -07:00 • committed by Teknium
parent bec02f3731
commit 36e046e843
1 changed files with 12 additions and 0 deletions
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12
gateway/run.py
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@ -2650,8 +2650,20 @@ class GatewayRunner:
# Enrich document messages with context notes for the agent
# -----------------------------------------------------------------
if event.media_urls and event.message_type == MessageType.DOCUMENT:
import mimetypes as _mimetypes
_TEXT_EXTENSIONS = {".txt", ".md", ".csv", ".log", ".json", ".xml", ".yaml", ".yml", ".toml", ".ini", ".cfg"}
for i, path in enumerate(event.media_urls):
mtype = event.media_types[i] if i < len(event.media_types) else ""
# Fall back to extension-based detection when MIME type is unreliable.
if mtype in ("", "application/octet-stream"):
import os as _os2
_ext = _os2.path.splitext(path)[1].lower()
if _ext in _TEXT_EXTENSIONS:
mtype = "text/plain"
else:
guessed, _ = _mimetypes.guess_type(path)
if guessed:
mtype = guessed
if not (mtype.startswith("application/") or mtype.startswith("text/")):
continue
# Extract display filename by stripping the doc_{uuid12}_ prefix