GAE-postmark.py

#!python
from google.appengine.api import mail
from google.appengine.api import urlfetch

try:
import json
except ImportError:
try:
    import simplejson as json
except ImportError:
    from django.utils import simplejson as json


class PMEmailMessage(mail.EmailMessage):
""" PMEmailMessage subclass that enables
                you to call the pmsend()
    method in order to send via Postmark
                instead of using GAE's
    built-in mail service.
"""

PM_API_KEY = 'PUTYOURKEYHERE'
PM_URL = 'http://api.postmarkapp.com/email'

@classmethod
def get_pm_headers(cls, test=False):
    """docstring for get_pm_headers"""
    d = {
        'Accept' : 'application/json',
        "Content-Type" : "application/json",
    }
    if test:
        k = 'POSTMARK_API_TEST'
    else:
        k = cls.PM_API_KEY

    d['X-Postmark-Server-Token'] = k
    return d

@property
def postmark_dict(self):
    """docstring for postmark_dict"""

    param_mapping = {
        'Headers' : 'headers',
        'ReplyTo' : 'reply_to',
        'Tag' : 'tag',
        'To' : 'to',
        'From' : 'sender',
        'Cc' : 'cc',
        'Bcc' : 'bcc',
        'Subject' : 'subject',
        'HtmlBody' : 'html',
        'TextBody' : 'body',
    }
    d = {}
    for k,v in param_mapping.iteritems():
        val = getattr(self, v, None)
        if val:
            d[k] = val

    return d

@property
def postmark_json(self):
    """docstring for postmark_json"""
    return json.dumps(self.postmark_dict)

def pmsend(self):
    """docstring for pmsend"""
    response = urlfetch.fetch(self.PM_URL,
                           method=urlfetch.POST,
                           payload=self.postmark_json,
                           headers=self.get_pm_headers())
    return response