CSV problems revealed by new cloudooo

New cloudooo uses text/csv as mimetype for CSV, which is correct, but this revealed issues in ERP5:
 - ERP5 did not detect text/csv for csv extensions
 - downloading a file with content type text/csv caused an error

See merge request nexedi/erp5!1859

bt5/erp5_dms/TestTemplateItem/portal_components/test.erp5.testDms.py

@@ -691,6 +691,56 @@ class TestDocument(TestDocumentMixin):
       'attachment; filename="PDF.pdf"; filename*=UTF-8\'\'PDF%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB.pdf',
     )
 
+  def test_download_content_type_by_mimetype_registry_extension(self):
+    content_type = 'application/andrew-inset'
+    data = b"data"
+    mime_type_entry, = self.portal.mimetypes_registry.lookup(content_type)
+    self.assertTrue(mime_type_entry.extensions)
+
+    doc = self.portal.document_module.newContent(
+      portal_type='File',
+      content_type=content_type,
+      data=data,
+    )
+    doc.publish()
+    self.tic()
+    response = self.publish('%s?format=' % doc.getPath())
+    self.assertEqual(response.getBody(), data)
+    self.assertEqual(response.getHeader('Content-Type'), content_type)
+
+  def test_download_content_type_by_mimetype_registry_glob(self):
+    content_type = 'application/x-compressed-tar'
+    data = (
+      b"\x1f\x8b\x08\x08e\x8a\x89e\x00\x03empty.tar\x00\xed\xc1\x01\r\x00\x00\x00\xc2\xa0"
+      b"\xf7Om\x0e7\xa0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x807\x03\x9a\xde\x1d'\x00(\x00\x00")
+    mime_type_entry, = self.portal.mimetypes_registry.lookup(content_type)
+    self.assertFalse(mime_type_entry.extensions)
+    self.assertTrue(mime_type_entry.globs)
+
+    doc = self.portal.document_module.newContent(
+      portal_type='File',
+      content_type=content_type,
+      data=data,
+    )
+    doc.publish()
+    self.tic()
+    response = self.publish('%s?format=' % doc.getPath())
+    self.assertEqual(response.getBody(), data)
+    self.assertEqual(response.getHeader('Content-Type'), content_type)
+
+  def test_csv(self):
+    doc = self.portal.document_module.newContent(
+      portal_type='Spreadsheet',
+      file=makeFileUpload('simple.csv'),
+    )
+    self.assertEqual(doc.getContentType(), 'text/csv')
+    doc.publish()
+    self.tic()
+    response = self.publish('%s?format=' % doc.getPath())
+    self.assertEqual(response.getBody(), makeFileUpload('simple.csv').read())
+    self.assertEqual(response.getHeader('Content-Type'), 'text/csv; charset=utf-8')
+    self.assertEqual(response.getHeader('Content-Disposition'), 'attachment; filename="simple.csv"')
+
   def test_05_getCreationDate(self):
     """
     Check getCreationDate on all document types.

product/ERP5/bootstrap/erp5_core/MixinTemplateItem/portal_components/mixin.erp5.DownloadableMixin.py

@@ -140,7 +140,7 @@ class DownloadableMixin:
             output_format = mimetype_object.extensions[0]
             break
           elif mimetype_object.globs:
-            output_format = mimetype_object.globs.strip('*.')
+            output_format = mimetype_object.globs[0].strip('*.')
             break
     if output_format is None:
       output_format = format

product/ERP5OOo/OOoTemplate.py

@@ -549,7 +549,7 @@ class OOoTemplate(ZopePageTemplate):
         extension = mimetype_object.extensions[0]
         break
       elif mimetype_object.globs:
-        extension = mimetype_object.globs.strip('*.')
+        extension = mimetype_object.globs[0].strip('*.')
         break
     if extension:
       filename = '%s.%s' % (self._getFileName(), extension)