monkeypatch NamedBlobFile to always ignore browser supplied mime type (#6337)

src/pfwbged/policy/configure.zcml

@@ -3,6 +3,7 @@
     xmlns:five="http://namespaces.zope.org/five"
     xmlns:grok="http://namespaces.zope.org/grok"
     xmlns:i18n="http://namespaces.zope.org/i18n"
+    xmlns:monkey="http://namespaces.plone.org/monkey"
     xmlns:genericsetup="http://namespaces.zope.org/genericsetup"
     xmlns:cmf="http://namespaces.zope.org/cmf"
     i18n_domain="pfwbged.policy">
@@ -69,4 +70,14 @@
 
     <adapter factory=".customize.DefaultDashboard" />
 
+    <include package="collective.monkeypatcher" />
+
+    <monkey:patch
+        description="Always ignore browser-supplied MIME type"
+        class="plone.namedfile.file.NamedBlobFile"
+        original="__init__"
+        preserveOriginal="true"
+        replacement=".monkey.patchedNamedBlobFileInit"
+        />
+
 </configure>

src/pfwbged/policy/monkey.py

@@ -0,0 +1,4 @@
+def patchedNamedBlobFileInit(self, data='', contentType='', filename=None):
+    if filename:
+        contentType = ''
+    self._old___init__(data=data, contentType=contentType, filename=filename)