0.5.2: Improve UTF-8 handling in previewer.

This improves the handling of non-ASCII encoded headers and message
bodies within the message previewer.

Thanks to @yunmanger1 and Sebastian Vetter (@elbaschid) for the initial
patches.

Closes #5, #6.

mailviews/previews.py

@@ -2,6 +2,7 @@
 import os
 from base64 import b64encode
 from collections import namedtuple
+from email.header import decode_header
 
 from django.conf.urls.defaults import include, patterns, url
 from django.core.urlresolvers import reverse
@@ -23,6 +24,17 @@
 ModulePreviews = namedtuple('ModulePreviews', ('module', 'previews'))
 
 
+def maybe_decode_header(header):
+    """
+    Decodes an encoded 7-bit ASCII header value into it's actual value.
+    """
+    value, encoding = decode_header(header)[0]
+    if encoding:
+        return value.decode(encoding)
+    else:
+        return value
+
+
 class PreviewSite(object):
     def __init__(self):
         self.__previews = {}
@@ -162,7 +174,7 @@ def detail_view(self, request):
 
         message = message_view.render_to_message()
         raw = message.message()
-        headers = SortedDict((header, raw[header]) for header in self.headers)
+        headers = SortedDict((header, maybe_decode_header(raw[header])) for header in self.headers)
 
         context.update({
             'message': message,
@@ -178,7 +190,7 @@ def detail_view(self, request):
                 if alternative[1] == 'text/html')
             context.update({
                 'html': html,
-                'escaped_html': b64encode(html),
+                'escaped_html': b64encode(html.encode('utf-8')),
             })
         except StopIteration:
             pass

mailviews/templates/mailviews/base.html

@@ -4,6 +4,8 @@
 
     {% load mailviews %}
 
+    <meta charset="utf-8" />
+
     <link rel="stylesheet" type="text/css" href="{% mailviews_static 'mailviews/css/bootstrap.css' %}" />
     <link rel="stylesheet" type="text/css" href="{% mailviews_static 'mailviews/css/mailviews.css' %}" />
 

mailviews/templates/mailviews/previews/detail.html

@@ -95,7 +95,7 @@ <h3>HTML</h3>
         <div class="tab-content">
 
             <section id="body-html" class="tab-pane active">
-                <iframe src="data:text/html;base64,{{ escaped_html }}" frameborder="0" allowtransparency="true"></iframe>
+                <iframe src="data:text/html;charset=utf-8;base64,{{ escaped_html }}" frameborder="0" allowtransparency="true"></iframe>
             </section>
 
             <section id="html-raw" class="tab-pane">

setup.py

@@ -5,7 +5,7 @@
 install_requires = ['django']
 
 setup(name='django-mailviews',
-    version='0.5.1',
+    version='0.5.2',
     url='http://github.com/disqus/django-mailviews/',
     author='ted kaemming',
     author_email='[email protected]',