Add debugging example to CODE_SAMPLES.md (#295)

Add an example invocation to CODE_SAMPLES that would allow for
MITM interception as well as debug prints to the console.

Drive-By: blacken the code samples.
Drive-By: Make code samples compliant with python3 (print->print())
Fixes: #270

CODE_SAMPLES.md

@@ -25,56 +25,55 @@ import datetime
 from pyicloud import PyiCloudService
 
 
-print('Setup Time Zone')
+print("Setup Time Zone")
-time.strftime('%X %x %Z')
+time.strftime("%X %x %Z")
-os.environ['TZ'] = 'America/New_York'
+os.environ["TZ"] = "America/New_York"
 
 
-
+print("Py iCloud Services")
-print('Py iCloud Services')
+api = PyiCloudService("your@me.com", "password")
-api = PyiCloudService('your@me.com', 'password')
 
 if api.requires_2fa:
-    print "Two-factor authentication required. Your trusted devices are:"
+    print("Two-factor authentication required. Your trusted devices are:")
 
     devices = api.trusted_devices
     for i, device in enumerate(devices):
-        print "  %s: %s" % (i, device.get('deviceName', "SMS to %s" %
+        print(
-        device.get('phoneNumber')))
+            "  %s: %s"
+            % (i, device.get("deviceName", "SMS to %s" % device.get("phoneNumber")))
+        )
 
-    device = click.prompt('Which device would you like to use?', default=0)
+    device = click.prompt("Which device would you like to use?", default=0)
     device = devices[device]
     if not api.send_verification_code(device):
-        print "Failed to send verification code"
+        print("Failed to send verification code")
         sys.exit(1)
 
-    code = click.prompt('Please enter validation code')
+    code = click.prompt("Please enter validation code")
     if not api.validate_verification_code(device, code):
-        print "Failed to verify verification code"
+        print("Failed to verify verification code")
         sys.exit(1)
 
 #
 # Devices
 #
-print('Devices')
+print("Devices")
 print(api.devices)
 print(api.devices[0])
 print(api.iphone)
 
 
-
 #
 # Location
 #
-print('Location')
+print("Location")
 print(api.iphone.location())
 
 
-
 #
 # Status
 #
-print('Status')
+print("Status")
 print(api.iphone.status())
 
 #
@@ -86,7 +85,7 @@ print(api.iphone.status())
 #
 # Events
 #
-print('Events')
+print("Events")
 print(api.calendar.events())
 from_dt = datetime.date(2018, 1, 1)
 to_dt = datetime.date(2018, 1, 31)
@@ -96,9 +95,9 @@ print(api.calendar.events(from_dt, to_dt))
 # ========
 # Contacts
 # ========
-print('Contacts')
+print("Contacts")
 for c in api.contacts.all():
-    print c.get('firstName'), c.get('phones')
+    print(c.get("firstName"), c.get("phones"))
 
 
 # =======================
@@ -107,6 +106,118 @@ for c in api.contacts.all():
 
 # You can access documents stored in your iCloud account by using the
 # ``files`` property's ``dir`` method:
-print('File Storage') 
+print("File Storage")
 print(api.files.dir())
 ```
+
+## From [@ixs](https://github.com/ixs)
+
+### Debug build of pyicloud
+
+This example allows to use tools like mitmproxy, fiddler, charles or similiar
+things to debug the data sent on the wire.
+
+In addition, the underlying requests module and the http.client are asked, to
+output all data sent and received to stdout.
+
+This uses code taken from [How do I disable the security certificate check in Python requests](https://stackoverflow.com/questions/15445981/how-do-i-disable-the-security-certificate-check-in-python-requests)
+and [Log all requests from the python-requests module](https://stackoverflow.com/questions/16337511/log-all-requests-from-the-python-requests-module)
+
+
+```python
+#!/usr/bin/env python3
+
+import contextlib
+import http.client
+import logging
+import requests
+import warnings
+from pprint import pprint
+from pyicloud import PyiCloudService
+from urllib3.exceptions import InsecureRequestWarning
+
+# Handle certificate warnings by ignoring them
+old_merge_environment_settings = requests.Session.merge_environment_settings
+
+
+@contextlib.contextmanager
+def no_ssl_verification():
+    opened_adapters = set()
+
+    def merge_environment_settings(self, url, proxies, stream, verify, cert):
+        # Verification happens only once per connection so we need to close
+        # all the opened adapters once we're done. Otherwise, the effects of
+        # verify=False persist beyond the end of this context manager.
+        opened_adapters.add(self.get_adapter(url))
+
+        settings = old_merge_environment_settings(
+            self, url, proxies, stream, verify, cert
+        )
+        settings["verify"] = False
+
+        return settings
+
+    requests.Session.merge_environment_settings = merge_environment_settings
+
+    try:
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", InsecureRequestWarning)
+            yield
+    finally:
+        requests.Session.merge_environment_settings = old_merge_environment_settings
+
+        for adapter in opened_adapters:
+            try:
+                adapter.close()
+            except:
+                pass
+
+
+# Monkeypatch the http client for full debugging output
+httpclient_logger = logging.getLogger("http.client")
+
+
+def httpclient_logging_patch(level=logging.DEBUG):
+    """Enable HTTPConnection debug logging to the logging framework"""
+
+    def httpclient_log(*args):
+        httpclient_logger.log(level, " ".join(args))
+
+    # mask the print() built-in in the http.client module to use
+    # logging instead
+    http.client.print = httpclient_log
+    # enable debugging
+    http.client.HTTPConnection.debuglevel = 1
+
+
+# Enable general debug logging
+logging.basicConfig(level=logging.DEBUG)
+
+httpclient_logging_patch()
+
+api = PyiCloudService(username, password)
+if api.requires_2sa:
+    print("Two-factor authentication required. Your trusted devices are:")
+
+    devices = api.trusted_devices
+    for i, device in enumerate(devices):
+        print(
+            "  %s: %s"
+            % (i, device.get("deviceName", "SMS to %s") % device.get("phoneNumber"))
+        )
+
+    device = click.prompt("Which device would you like to use?", default=0)
+    device = devices[device]
+    if not api.send_verification_code(device):
+        print("Failed to send verification code")
+        sys.exit(1)
+
+    code = click.prompt("Please enter validation code")
+    if not api.validate_verification_code(device, code):
+        print("Failed to verify verification code")
+        sys.exit(1)
+
+# This request will not fail, even if using intercepting proxies.
+with no_ssl_verification():
+    pprint(api.account)
+```