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Fix: treat first text/plain alternative as plaintext body

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Improve handling of alternative parts and `content_subtype`
to match how Django's SMTP backend handles some unusual cases.

Change Test backend to support (and record) text/* alternative
parts. (But still reject other types of alternatives.)

Fixes #252
This commit is contained in:
medmunds
2022-01-10 15:27:12 -08:00
committed by Mike Edmunds
parent 28247ec042
commit 60fbe1e896
4 changed files with 111 additions and 9 deletions
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37
anymail/backends/base.py
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@@ -281,9 +281,7 @@ class BasePayload:
else:
value = converter(value)
if value is not UNSET:
if attr == 'body':
setter = self.set_html_body if message.content_subtype == 'html' else self.set_text_body
elif attr == 'from_email':
if attr == 'from_email':
setter = self.set_from_email_list
elif attr == 'extra_headers':
setter = self.process_extra_headers
@@ -452,6 +450,18 @@ class BasePayload:
# headers is a CaseInsensitiveDict, and is a copy (so is safe to modify)
self.unsupported_feature('extra_headers')
def set_body(self, body):
# Interpret message.body depending on message.content_subtype.
# (Subclasses should generally implement set_text_body and set_html_body
# rather than overriding this.)
content_subtype = self.message.content_subtype
if content_subtype == "plain":
self.set_text_body(body)
elif content_subtype == "html":
self.set_html_body(body)
else:
self.add_alternative(body, "text/%s" % content_subtype)
def set_text_body(self, body):
raise NotImplementedError("%s.%s must implement set_text_body" %
(self.__class__.__module__, self.__class__.__name__))
@@ -461,17 +471,28 @@ class BasePayload:
(self.__class__.__module__, self.__class__.__name__))
def set_alternatives(self, alternatives):
# Handle treating first text/{plain,html} alternatives as bodies.
# (Subclasses should generally implement add_alternative
# rather than overriding this.)
has_plain_body = self.message.content_subtype == "plain" and self.message.body
has_html_body = self.message.content_subtype == "html" and self.message.body
for content, mimetype in alternatives:
if mimetype == "text/html":
# This assumes that there's at most one html alternative,
# and so it should be the html body. (Most ESPs don't
# support multiple html alternative parts anyway.)
if mimetype == "text/plain" and not has_plain_body:
self.set_text_body(content)
has_plain_body = True
elif mimetype == "text/html" and not has_html_body:
self.set_html_body(content)
has_html_body = True
else:
self.add_alternative(content, mimetype)
def add_alternative(self, content, mimetype):
self.unsupported_feature("alternative part with type '%s'" % mimetype)
if mimetype == "text/plain":
self.unsupported_feature("multiple plaintext parts")
elif mimetype == "text/html":
self.unsupported_feature("multiple html parts")
else:
self.unsupported_feature("alternative part with type '%s'" % mimetype)
def set_attachments(self, attachments):
for attachment in attachments: