misc: add get_base64_content() to get file content as base64 (#39306)

tests/test_workflows.py

@@ -1,3 +1,4 @@
+import base64
 import json
 import datetime
 import os
@@ -3665,6 +3666,8 @@ def test_set_backoffice_field_file(http_requests, two_pubs):
     assert formdata.data['bo1'].base_filename == 'test.jpeg'
     assert formdata.data['bo1'].content_type == 'image/jpeg'
     assert formdata.data['bo1'].get_content() == open(os.path.join(os.path.dirname(__file__), 'image-with-gps-data.jpeg'), 'rb').read()
+    assert formdata.data['bo1'].get_base64_content() == base64.encodestring(
+            open(os.path.join(os.path.dirname(__file__), 'image-with-gps-data.jpeg'), 'rb').read())
 
     # same test with PicklableUpload wcs.qommon.form
     from wcs.qommon.form import PicklableUpload as PicklableUpload2

wcs/qommon/form.py

@@ -866,6 +866,12 @@ class PicklableUpload(Upload):
             return open(filename, 'rb').read()
         return None
 
+    def get_base64_content(self):
+        content = self.get_content()
+        if content:
+            return base64.encodestring(content)
+        return None
+
 
 class EmailWidget(StringWidget):
     HTML_TYPE = 'email'