python之Django Mandrill 电子邮件编码

编辑。找到解决方案:pdf 文档似乎必须进行 base64 编码。像这样编辑异步 View :

import base64 
result = export_pdf(request) 
encoded = base64.b64encode(result.getvalue()) 
email = mandrill.Mandrill(settings.MANDRILL_API_KEY) 
email.messages.send_template(mandrill_template, [], {'to':[{'email':user.email}], 'subject':subject, 'text':message, attachments':[{'type':'application/pdf', 'name':'pdf file', 'content':encoded}] }) 

编辑结束

我在将使用 xhtml2pdf/pisa 创建的 pdf 文档作为附件发送到 Mandrill 时遇到问题。 应用程序的工作方式如下:content_view 调用 async_view

1. 生成 pdf(通过调用 export_pdf 函数)和
2. 发送带附件的电子邮件。

pdf 文档似乎有效(如果我将 async_view 修改为 HttpResponse 而不是发送 pdf，我会看到一个有效的 pdf 文档)。 但是将它发送到 Mandrill 会返回一个编码错误:

UnicodeDecodeError: 'utf8' codec can't decode byte 0x93 in position 11: invalid start byte.

我尝试按照此处提到的方式解决它 ( Python: Sanitize a string for unicode? )。在这种情况下，不再出现错误，但我作为电子邮件附件获得的 pdf 被视为“文本/纯文本”且不可读。 感谢您的帮助!

异步 View

pdf_doc = export_pdf(request).getvalue() # .decode("windows-1252").encode("utf-8", 'ignore') would not raise an error but would be considered as plain text 
email = mandrill.Mandrill(settings.MANDRILL_API_KEY) 
email.messages.send_template(mandrill_template, [], {'to':[{'email':user.email}], 'subject':subject, 'text':message, attachments':[{'type':'application/pdf', 'name':'pdf file', 'content':pdf_doc}] }) 
 
# return HttpResponse(pdf_doc,  mimetype='application/pdf') would return a well formatted pdf 

export_pdf 函数

def export_pdf(request): 
 
    html  = render_to_string('pdf.html', { 'pagesize' : 'A4', }, context_instance=RequestContext(request,{ 
                'text': text, 
            },)) 
    result = cStringIO.StringIO()        
    pdf = pisa.pisaDocument(StringIO.StringIO(html), dest=result, encoding='UTF-8') 
    if not pdf.err: 
        return result 
    else: 
        return None 

回溯的有趣部分是

(...) 
File "/home/raphael/Applications/Virtualenvs/apps/local/lib/python2.7/site-packages/mandrill.py", line 1476, in send_template 
    return self.master.call('messages/send-template', _params) 
File "/home/raphael/Applications/Virtualenvs/apps/local/lib/python2.7/site-packages/mandrill.py", line 137, in call 
    params = json.dumps(params) 
File "/home/raphael/Applications/Virtualenvs/apps/local/lib/python2.7/site-packages/simplejson/__init__.py", line 354, in dumps 
    return _default_encoder.encode(obj) 
File "/home/raphael/Applications/Virtualenvs/apps/local/lib/python2.7/site-packages/simplejson/encoder.py", line 262, in encode 
    chunks = self.iterencode(o, _one_shot=True) 
File "/home/raphael/Applications/Virtualenvs/apps/local/lib/python2.7/site-packages/simplejson/encoder.py", line 340, in iterencode 
    return _iterencode(o, 0) 
UnicodeDecodeError: 'utf8' codec can't decode byte 0x93 in position 11: invalid start byte 

请您参考如下方法:

找到解决方案:pdf 文档似乎必须进行 base64 编码。像这样编辑异步 View :

import base64 
result = export_pdf(request) 
encoded = base64.b64encode(result.getvalue()) 
email = mandrill.Mandrill(settings.MANDRILL_API_KEY) 
email.messages.send_template(mandrill_template, [], {'to':[{'email':user.email}], 'subject':subject, 'text':message, attachments':[{'type':'application/pdf', 'name':'pdf file', 'content':encoded}] })