flask_heroku.py

#!/usr/bin/env python

from logging import getLogger
from os import environ
try:
    from urllib.parse import urlparse
except ImportError:
    from urlparse import urlparse

logger = getLogger(__name__)

class Heroku(object):
    """Heroku configurations for flask."""

    def __init__(self, app=None):
        self.app = app
        if app is not None:
            self.init_app(app)

    def init_app(self, app):
        # app.secret_key
        app.config.setdefault('SECRET_KEY', environ.get('SECRET_KEY'))

        # SQL-Alchemy
        app.config.setdefault('SQLALCHEMY_DATABASE_URI', environ.get('DATABASE_URL'))

        # Sentry
        app.config.setdefault('SENTRY_DSN', environ.get('SENTRY_DSN'))

        # Exceptional
        app.config.setdefault('EXCEPTIONAL_API_KEY', environ.get('EXCEPTIONAL_API_KEY'))

        # Flask-GoogleFed
        app.config.setdefault('GOOGLE_DOMAIN', environ.get('GOOGLE_DOMAIN'))

        # Celery w/ RabbitMQ
        if 'RABBITMQ_URL' in environ:
            app.config.setdefault('BROKER_URL', environ.get('RABBITMQ_URL'))
        # Celery w/ RedisCloud
        elif 'REDISCLOUD_URL' in environ:
            app.config.setdefault('BROKER_URL', environ.get('REDISCLOUD_URL'))
            app.config.setdefault('BROKER_TRANSPORT', environ.get('REDISCLOUD_URL'))

        # Mailgun
        if 'MAILGUN_SMTP_SERVER' in environ:
            app.config.setdefault('SMTP_SERVER', environ.get('MAILGUN_SMTP_SERVER'))
            app.config.setdefault('SMTP_LOGIN', environ.get('MAILGUN_SMTP_LOGIN'))
            app.config.setdefault('SMTP_PASSWORD', environ.get('MAILGUN_SMTP_PASSWORD'))
            app.config.setdefault('MAIL_SERVER', environ.get('MAILGUN_SMTP_SERVER'))
            app.config.setdefault('MAIL_USERNAME', environ.get('MAILGUN_SMTP_LOGIN'))
            app.config.setdefault('MAIL_PASSWORD', environ.get('MAILGUN_SMTP_PASSWORD'))
            app.config.setdefault('MAIL_USE_TLS', True)
        # SendGrid
        elif 'SENDGRID_USERNAME' in environ:
            app.config.setdefault('SMTP_SERVER', 'smtp.sendgrid.net')
            app.config.setdefault('SMTP_LOGIN', environ.get('SENDGRID_USERNAME'))
            app.config.setdefault('SMTP_PASSWORD', environ.get('SENDGRID_PASSWORD'))
            app.config.setdefault('MAIL_SERVER', 'smtp.sendgrid.net')
            app.config.setdefault('MAIL_USERNAME', environ.get('SENDGRID_USERNAME'))
            app.config.setdefault('MAIL_PASSWORD', environ.get('SENDGRID_PASSWORD'))
            app.config.setdefault('MAIL_USE_TLS', True)
        # Postmark
        elif 'POSTMARK_SMTP_SERVER' in environ:
            app.config.setdefault('SMTP_SERVER', 'POSTMARK_SMTP_SERVER')
            app.config.setdefault('SMTP_LOGIN', environ.get('POSTMARK_API_KEY'))
            app.config.setdefault('SMTP_PASSWORD', environ.get('POSTMARK_API_KEY'))
            app.config.setdefault('MAIL_SERVER', 'POSTMARK_SMTP_SERVER')
            app.config.setdefault('MAIL_USERNAME', environ.get('POSTMARK_API_KEY'))
            app.config.setdefault('MAIL_PASSWORD', environ.get('POSTMARK_API_KEY'))
            app.config.setdefault('MAIL_USE_TLS', True)

        # Heroku Redis
        redis_url = environ.get('REDIS_URL')
        if redis_url:
            url = urlparse(redis_url)
            app.config.setdefault('REDIS_HOST', url.hostname)
            app.config.setdefault('REDIS_PORT', url.port)
            app.config.setdefault('REDIS_PASSWORD', url.password)

        # Redis To Go
        redis_url = environ.get('REDISTOGO_URL')
        if redis_url:
            url = urlparse(redis_url)
            app.config.setdefault('REDIS_HOST', url.hostname)
            app.config.setdefault('REDIS_PORT', url.port)
            app.config.setdefault('REDIS_PASSWORD', url.password)

        # Mongolab, MongoHQ and mLab MongoHQ
        mongo_addon_vars = {'MONGOLAB_URI', 'MONGOHQ_URL', 'MONGODB_URI'}
        defined_env_vars = set(environ.keys())

        defined_mongo_addons = defined_env_vars & mongo_addon_vars

        if len(defined_mongo_addons) == 1:
            mongo_addon_var = defined_mongo_addons.pop()
            mongo_uri = environ[mongo_addon_var]

            url = urlparse(mongo_uri)
            app.config.setdefault('MONGO_URI', mongo_uri)
            app.config.setdefault('MONGODB_USER', url.username)
            app.config.setdefault('MONGODB_USERNAME', url.username)
            app.config.setdefault('MONGODB_PASSWORD', url.password)
            app.config.setdefault('MONGODB_HOST', url.hostname)
            app.config.setdefault('MONGODB_PORT', url.port)
            app.config.setdefault('MONGODB_DB', url.path[1:])

        elif len(defined_mongo_addons) > 1:
            logger.error(
                'Multiple MongoDB addons enabled. Flask-Heroku cannot '
                'determine which to use.')


        # Cloudant
        cloudant_uri = environ.get('CLOUDANT_URL')
        if cloudant_uri:
            app.config.setdefault('COUCHDB_SERVER', cloudant_uri)

        # Memcachier
        app.config.setdefault('CACHE_MEMCACHED_SERVERS', environ.get('MEMCACHIER_SERVERS'))
        app.config.setdefault('CACHE_MEMCACHED_USERNAME', environ.get('MEMCACHIER_USERNAME'))
        app.config.setdefault('CACHE_MEMCACHED_PASSWORD', environ.get('MEMCACHIER_PASSWORD'))