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adventureland/libraries/stripe/http_client.py
T
Kaan Soral 553b121f17 Open source
2023-10-15 13:06:58 +03:00

296 lines
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import os
import sys
import textwrap
import warnings
import email
from libraries.stripe import error, util
# - Requests is the preferred HTTP library
# - Google App Engine has urlfetch
# - Use Pycurl if it's there (at least it verifies SSL certs)
# - Fall back to urllib2 with a warning if needed
try:
import urllib2
except ImportError:
pass
try:
import pycurl
except ImportError:
pycurl = None
try:
import requests
except ImportError:
requests = None
else:
try:
# Require version 0.8.8, but don't want to depend on distutils
version = requests.__version__
major, minor, patch = [int(i) for i in version.split('.')]
except Exception:
# Probably some new-fangled version, so it should support verify
pass
else:
if (major, minor, patch) < (0, 8, 8):
sys.stderr.write(
'Warning: the Stripe library requires that your Python '
'"requests" library be newer than version 0.8.8, but your '
'"requests" library is version %s. Stripe will fall back to '
'an alternate HTTP library so everything should work. We '
'recommend upgrading your "requests" library. If you have any '
'questions, please contact support@stripe.com. (HINT: running '
'"pip install -U requests" should upgrade your requests '
'library to the latest version.)' % (version,))
requests = None
try:
from google.appengine.api import urlfetch
except ImportError:
urlfetch = None
def new_default_http_client(*args, **kwargs):
if urlfetch:
impl = UrlFetchClient
elif requests:
impl = RequestsClient
elif pycurl:
impl = PycurlClient
else:
impl = Urllib2Client
warnings.warn(
"Warning: the Stripe library is falling back to urllib2/urllib "
"because neither requests nor pycurl are installed. "
"urllib2's SSL implementation doesn't verify server "
"certificates. For improved security, we suggest installing "
"requests.")
return impl(*args, **kwargs)
class HTTPClient(object):
def __init__(self, verify_ssl_certs=True):
self._verify_ssl_certs = verify_ssl_certs
def request(self, method, url, headers, post_data=None):
raise NotImplementedError(
'HTTPClient subclasses must implement `request`')
class RequestsClient(HTTPClient):
name = 'requests'
def request(self, method, url, headers, post_data=None):
kwargs = {}
if self._verify_ssl_certs:
kwargs['verify'] = os.path.join(
os.path.dirname(__file__), 'data/ca-certificates.crt')
else:
kwargs['verify'] = False
try:
try:
result = requests.request(method,
url,
headers=headers,
data=post_data,
timeout=80,
**kwargs)
except TypeError as e:
raise TypeError(
'Warning: It looks like your installed version of the '
'"requests" library is not compatible with Stripe\'s '
'usage thereof. (HINT: The most likely cause is that '
'your "requests" library is out of date. You can fix '
'that by running "pip install -U requests".) The '
'underlying error was: %s' % (e,))
# This causes the content to actually be read, which could cause
# e.g. a socket timeout. TODO: The other fetch methods probably
# are susceptible to the same and should be updated.
content = result.content
status_code = result.status_code
except Exception as e:
# Would catch just requests.exceptions.RequestException, but can
# also raise ValueError, RuntimeError, etc.
self._handle_request_error(e)
return content, status_code, result.headers
def _handle_request_error(self, e):
if isinstance(e, requests.exceptions.RequestException):
msg = ("Unexpected error communicating with Stripe. "
"If this problem persists, let us know at "
"support@stripe.com.")
err = "%s: %s" % (type(e).__name__, str(e))
else:
msg = ("Unexpected error communicating with Stripe. "
"It looks like there's probably a configuration "
"issue locally. If this problem persists, let us "
"know at support@stripe.com.")
err = "A %s was raised" % (type(e).__name__,)
if str(e):
err += " with error message %s" % (str(e),)
else:
err += " with no error message"
msg = textwrap.fill(msg) + "\n\n(Network error: %s)" % (err,)
raise error.APIConnectionError(msg)
class UrlFetchClient(HTTPClient):
name = 'urlfetch'
def __init__(self, verify_ssl_certs=True, deadline=55):
self._verify_ssl_certs = verify_ssl_certs
# GAE requests time out after 60 seconds, so make sure to default
# to 55 seconds to allow for a slow Stripe
self._deadline = deadline
def request(self, method, url, headers, post_data=None):
try:
result = urlfetch.fetch(
url=url,
method=method,
headers=headers,
# Google App Engine doesn't let us specify our own cert bundle.
# However, that's ok because the CA bundle they use recognizes
# api.stripe.com.
validate_certificate=self._verify_ssl_certs,
deadline=self._deadline,
payload=post_data
)
except urlfetch.Error as e:
self._handle_request_error(e, url)
return result.content, result.status_code, result.headers
def _handle_request_error(self, e, url):
if isinstance(e, urlfetch.InvalidURLError):
msg = ("The Stripe library attempted to fetch an "
"invalid URL (%r). This is likely due to a bug "
"in the Stripe Python bindings. Please let us know "
"at support@stripe.com." % (url,))
elif isinstance(e, urlfetch.DownloadError):
msg = "There was a problem retrieving data from Stripe."
elif isinstance(e, urlfetch.ResponseTooLargeError):
msg = ("There was a problem receiving all of your data from "
"Stripe. This is likely due to a bug in Stripe. "
"Please let us know at support@stripe.com.")
else:
msg = ("Unexpected error communicating with Stripe. If this "
"problem persists, let us know at support@stripe.com.")
msg = textwrap.fill(msg) + "\n\n(Network error: " + str(e) + ")"
raise error.APIConnectionError(msg)
class PycurlClient(HTTPClient):
name = 'pycurl'
def parse_headers(self, data):
if '\r\n' not in data:
return {}
raw_headers = data.split('\r\n', 1)[1]
headers = email.message_from_string(raw_headers)
return dict((k.lower(), v) for k, v in dict(headers).iteritems())
def request(self, method, url, headers, post_data=None):
s = util.StringIO.StringIO()
rheaders = util.StringIO.StringIO()
curl = pycurl.Curl()
if method == 'get':
curl.setopt(pycurl.HTTPGET, 1)
elif method == 'post':
curl.setopt(pycurl.POST, 1)
curl.setopt(pycurl.POSTFIELDS, post_data)
else:
curl.setopt(pycurl.CUSTOMREQUEST, method.upper())
# pycurl doesn't like unicode URLs
curl.setopt(pycurl.URL, util.utf8(url))
curl.setopt(pycurl.WRITEFUNCTION, s.write)
curl.setopt(pycurl.HEADERFUNCTION, rheaders.write)
curl.setopt(pycurl.NOSIGNAL, 1)
curl.setopt(pycurl.CONNECTTIMEOUT, 30)
curl.setopt(pycurl.TIMEOUT, 80)
curl.setopt(pycurl.HTTPHEADER, ['%s: %s' % (k, v)
for k, v in headers.iteritems()])
if self._verify_ssl_certs:
curl.setopt(pycurl.CAINFO, os.path.join(
os.path.dirname(__file__), 'data/ca-certificates.crt'))
else:
curl.setopt(pycurl.SSL_VERIFYHOST, False)
try:
curl.perform()
except pycurl.error as e:
self._handle_request_error(e)
rbody = s.getvalue()
rcode = curl.getinfo(pycurl.RESPONSE_CODE)
return rbody, rcode, self.parse_headers(rheaders.getvalue())
def _handle_request_error(self, e):
if e[0] in [pycurl.E_COULDNT_CONNECT,
pycurl.E_COULDNT_RESOLVE_HOST,
pycurl.E_OPERATION_TIMEOUTED]:
msg = ("Could not connect to Stripe. Please check your "
"internet connection and try again. If this problem "
"persists, you should check Stripe's service status at "
"https://twitter.com/stripestatus, or let us know at "
"support@stripe.com.")
elif (e[0] in [pycurl.E_SSL_CACERT,
pycurl.E_SSL_PEER_CERTIFICATE]):
msg = ("Could not verify Stripe's SSL certificate. Please make "
"sure that your network is not intercepting certificates. "
"If this problem persists, let us know at "
"support@stripe.com.")
else:
msg = ("Unexpected error communicating with Stripe. If this "
"problem persists, let us know at support@stripe.com.")
msg = textwrap.fill(msg) + "\n\n(Network error: " + e[1] + ")"
raise error.APIConnectionError(msg)
class Urllib2Client(HTTPClient):
if sys.version_info >= (3, 0):
name = 'urllib.request'
else:
name = 'urllib2'
def request(self, method, url, headers, post_data=None):
if sys.version_info >= (3, 0) and isinstance(post_data, basestring):
post_data = post_data.encode('utf-8')
req = urllib2.Request(url, post_data, headers)
if method not in ('get', 'post'):
req.get_method = lambda: method.upper()
try:
response = urllib2.urlopen(req)
rbody = response.read()
rcode = response.code
headers = dict(response.info())
except urllib2.HTTPError as e:
rcode = e.code
rbody = e.read()
headers = dict(e.info())
except (urllib2.URLError, ValueError) as e:
self._handle_request_error(e)
lh = dict((k.lower(), v) for k, v in dict(headers).iteritems())
return rbody, rcode, lh
def _handle_request_error(self, e):
msg = ("Unexpected error communicating with Stripe. "
"If this problem persists, let us know at support@stripe.com.")
msg = textwrap.fill(msg) + "\n\n(Network error: " + str(e) + ")"
raise error.APIConnectionError(msg)
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