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config.py
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config.py
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# Copyright (c) 2015, Menno Smits
# Released subject to the New BSD License
# Please see http://en.wikipedia.org/wiki/BSD_licenses
import json
from os import environ, path
import ssl
import configparser
import urllib.parse
import urllib.request
import imapclient
def getenv(name, default):
return environ.get("imapclient_" + name, default)
def get_config_defaults():
return dict(
username=getenv("username", None),
password=getenv("password", None),
ssl=True,
ssl_check_hostname=True,
ssl_verify_cert=True,
ssl_ca_file=None,
timeout=None,
starttls=False,
stream=False,
oauth2=False,
oauth2_client_id=getenv("oauth2_client_id", None),
oauth2_client_secret=getenv("oauth2_client_secret", None),
oauth2_refresh_token=getenv("oauth2_refresh_token", None),
expect_failure=None,
)
def parse_config_file(filename):
"""Parse INI files containing IMAP connection details.
Used by livetest.py and interact.py
"""
parser = configparser.SafeConfigParser(get_string_config_defaults())
with open(filename, "r") as fh:
parser.readfp(fh)
conf = _read_config_section(parser, "DEFAULT")
if conf.expect_failure:
raise ValueError("expect_failure should not be set for the DEFAULT section")
conf.alternates = {}
for section in parser.sections():
conf.alternates[section] = _read_config_section(parser, section)
return conf
def get_string_config_defaults():
out = {}
for k, v in get_config_defaults().items():
if v is True:
v = "true"
elif v is False:
v = "false"
elif not v:
v = ""
out[k] = v
return out
def _read_config_section(parser, section):
get = lambda name: parser.get(section, name)
getboolean = lambda name: parser.getboolean(section, name)
def get_allowing_none(name, typefunc):
try:
v = parser.get(section, name)
except configparser.NoOptionError:
return None
if not v:
return None
return typefunc(v)
def getint(name):
return get_allowing_none(name, int)
def getfloat(name):
return get_allowing_none(name, float)
ssl_ca_file = get("ssl_ca_file")
if ssl_ca_file:
ssl_ca_file = path.expanduser(ssl_ca_file)
return Bunch(
host=get("host"),
port=getint("port"),
ssl=getboolean("ssl"),
starttls=getboolean("starttls"),
ssl_check_hostname=getboolean("ssl_check_hostname"),
ssl_verify_cert=getboolean("ssl_verify_cert"),
ssl_ca_file=ssl_ca_file,
timeout=getfloat("timeout"),
stream=getboolean("stream"),
username=get("username"),
password=get("password"),
oauth2=getboolean("oauth2"),
oauth2_client_id=get("oauth2_client_id"),
oauth2_client_secret=get("oauth2_client_secret"),
oauth2_refresh_token=get("oauth2_refresh_token"),
expect_failure=get("expect_failure"),
)
OAUTH2_REFRESH_URLS = {
"imap.gmail.com": "https://accounts.google.com/o/oauth2/token",
"imap.mail.yahoo.com": "https://api.login.yahoo.com/oauth2/get_token",
}
def refresh_oauth2_token(hostname, client_id, client_secret, refresh_token):
url = OAUTH2_REFRESH_URLS.get(hostname)
if not url:
raise ValueError("don't know where to refresh OAUTH2 token for %r" % hostname)
post = dict(
client_id=client_id.encode("ascii"),
client_secret=client_secret.encode("ascii"),
refresh_token=refresh_token.encode("ascii"),
grant_type=b"refresh_token",
)
response = urllib.request.urlopen(
url, urllib.parse.urlencode(post).encode("ascii")
).read()
return json.loads(response.decode("ascii"))["access_token"]
# Tokens are expensive to refresh so use the same one for the duration of the process.
_oauth2_cache = {}
def get_oauth2_token(hostname, client_id, client_secret, refresh_token):
cache_key = (hostname, client_id, client_secret, refresh_token)
token = _oauth2_cache.get(cache_key)
if token:
return token
token = refresh_oauth2_token(hostname, client_id, client_secret, refresh_token)
_oauth2_cache[cache_key] = token
return token
def create_client_from_config(conf, login=True):
assert conf.host, "missing host"
ssl_context = None
if conf.ssl:
ssl_context = ssl.create_default_context()
ssl_context.check_hostname = conf.ssl_check_hostname
if not conf.ssl_verify_cert:
ssl_context.verify_mode = ssl.CERT_NONE
if conf.ssl_ca_file:
ssl_context.load_verify_locations(cafile=conf.ssl_ca_file)
client = imapclient.IMAPClient(
conf.host,
port=conf.port,
ssl=conf.ssl,
ssl_context=ssl_context,
stream=conf.stream,
timeout=conf.timeout,
)
if not login:
return client
try:
if conf.starttls:
client.starttls()
if conf.oauth2:
assert conf.oauth2_client_id, "missing oauth2 id"
assert conf.oauth2_client_secret, "missing oauth2 secret"
assert conf.oauth2_refresh_token, "missing oauth2 refresh token"
access_token = get_oauth2_token(
conf.host,
conf.oauth2_client_id,
conf.oauth2_client_secret,
conf.oauth2_refresh_token,
)
client.oauth2_login(conf.username, access_token)
elif not conf.stream:
assert conf.username, "missing username"
assert conf.password, "missing password"
client.login(conf.username, conf.password)
return client
except:
client.shutdown()
raise
class Bunch(dict):
def __getattr__(self, k):
try:
return self[k]
except KeyError:
raise AttributeError
def __setattr__(self, k, v):
self[k] = v