procssing malformed docx: media file not in [Content_Types].xml

Author: wangkebo

requirements.txt

@@ -1,2 +1,3 @@
 lxml>=3.1.0
 typing-extensions
+python-magic

src/docx/opc/pkgreader.py

@@ -5,6 +5,7 @@
 from docx.opc.packuri import PACKAGE_URI, PackURI
 from docx.opc.phys_pkg import PhysPkgReader
 from docx.opc.shared import CaseInsensitiveDict
+import magic
 
 
 class PackageReader:
@@ -51,7 +52,10 @@ def _load_serialized_parts(phys_reader, pkg_srels, content_types):
         sparts = []
         part_walker = PackageReader._walk_phys_parts(phys_reader, pkg_srels)
         for partname, blob, reltype, srels in part_walker:
-            content_type = content_types[partname]
+            try:
+                content_type = content_types[partname]
+            except KeyError:
+                content_type = magic.from_buffer(blob, mime=True)
             spart = _SerializedPart(partname, content_type, reltype, blob, srels)
             sparts.append(spart)
         return tuple(sparts)