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import logging
import json
import six
from urlparse import urlparse
from mechanize import ParseResponseEx
from mechanize._form import ControlNotFoundError, AmbiguityError
from mechanize._form import ListControl
__author__ = 'rohe0002'
logger = logging.getLogger(__name__)
class FlowException(Exception):
def __init__(self, function="", content="", url=""):
Exception.__init__(self)
self.function = function
self.content = content
self.url = url
def __str__(self):
return json.dumps(self.__dict__)
class DResponse():
""" A Response class that behaves in the way that mechanize expects it
"""
def __init__(self, **kwargs):
self.status = 200 # default
self.index = 0
self._message = ""
self.url = ""
if kwargs:
for key, val in kwargs.items():
if val:
self.__setitem__(key, val)
def __setitem__(self, key, value):
setattr(self, key, value)
def __getitem__(self, item):
if item == "content-location":
return self.url
elif item == "content-length":
return len(self._message)
else:
return getattr(self, item)
def geturl(self):
"""
The base url for the response
:return: The url
"""
return self.url
def read(self, size=0):
"""
Read from the content of the response. The class remembers what has
been read so it's possible to read small consecutive parts of the
content.
:param size: The number of bytes to read
:return: Somewhere between zero and 'size' number of bytes depending
on how much it left in the content buffer to read.
"""
if size:
if self._len < size:
return self._message
else:
if self._len == self.index:
part = None
elif self._len - self.index < size:
part = self._message[self.index:]
self.index = self._len
else:
part = self._message[self.index:self.index + size]
self.index += size
return part
else:
return self._message
def write(self, message):
"""
Write the message into the content buffer
:param message: The message
"""
self._message = message
self._len = len(message)
def do_request(client, url, method, body="", headers=None):
"""
Sends a HTTP request.
:param client: The client instance
:param url: Where to send the request
:param method: The HTTP method to use for the request
:param body: The request body
:param headers: The requset headers
:return: A tuple of
url - the url the request was sent to
response - the response to the request
content - the content of the response if any
"""
if headers is None:
headers = {}
logger.info("--> URL: %s", url)
logger.info("--> BODY: %s", body)
logger.info("--> Headers: %s", headers)
response = client.http_request(url, method=method, data=body,
headers=headers)
logger.info("<-- RESPONSE: %s", response)
logger.info("<-- CONTENT: %s", response.text)
if response.cookies:
logger.info("<-- COOKIES: %s", response.cookies)
return url, response, response.text
def pick_form(response, content, url=None, **kwargs):
"""
Picks which form in a web-page that should be used
:param response: A HTTP request response. A DResponse instance
:param content: The HTTP response content
:param url: The url the request was sent to
:return: The picked form or None of no form matched the criteria.
"""
forms = ParseResponseEx(response)
if not forms:
raise FlowException(content=content, url=url)
#if len(forms) == 1:
# return forms[0]
#else:
_form = None
# ignore the first form for now
forms = forms[1:]
if len(forms) == 1:
_form = forms[0]
else:
if "pick" in kwargs:
_dict = kwargs["pick"]
for form in forms:
if _form:
break
for key, _ava in _dict.items():
if key == "form":
_keys = form.attrs.keys()
for attr, val in _ava.items():
if attr in _keys and val == form.attrs[attr]:
_form = form
elif key == "control":
prop = _ava["id"]
_default = _ava["value"]
try:
orig_val = form[prop]
if isinstance(orig_val, six.string_types):
if orig_val == _default:
_form = form
elif _default in orig_val:
_form = form
except KeyError:
pass
elif key == "method":
if form.method == _ava:
_form = form
else:
_form = None
if not _form:
break
elif "index" in kwargs:
_form = forms[int(kwargs["index"])]
return _form
def do_click(client, form, **kwargs):
"""
Emulates the user clicking submit on a form.
:param client: The Client instance
:param form: The form that should be submitted
:return: What do_request() returns
"""
if "click" in kwargs:
request = None
_name = kwargs["click"]
try:
_ = form.find_control(name=_name)
request = form.click(name=_name)
except AmbiguityError:
# more than one control with that name
_val = kwargs["set"][_name]
_nr = 0
while True:
try:
cntrl = form.find_control(name=_name, nr=_nr)
if cntrl.value == _val:
request = form.click(name=_name, nr=_nr)
break
else:
_nr += 1
except ControlNotFoundError:
raise Exception("No submit control with the name='%s' and "
"value='%s' could be found" % (_name,
_val))
else:
request = form.click()
headers = {}
for key, val in request.unredirected_hdrs.items():
headers[key] = val
url = request._Request__original
if form.method == "POST":
return do_request(client, url, "POST", request.data, headers)
else:
return do_request(client, url, "GET", headers=headers)
def select_form(client, orig_response, content, **kwargs):
"""
Pick a form on a web page, possibly enter some information and submit
the form.
:param client: The Client
:param orig_response: The original response (as returned by httplib2)
:param content: The content of the response
:return: The response do_click() returns
"""
try:
_url = orig_response.url
except KeyError:
_url = kwargs["location"]
# content is a form to be filled in and returned
response = DResponse(status=orig_response.status_code, url=_url)
response.write(content)
form = pick_form(response, content, _url, **kwargs)
#form.backwards_compatible = False
if not form:
raise Exception("Can't pick a form !!")
if "set" in kwargs:
for key, val in kwargs["set"].items():
if key.startswith("_"):
continue
if "click" in kwargs and kwargs["click"] == key:
continue
try:
form[key] = val
except ControlNotFoundError:
pass
except TypeError:
cntrl = form.find_control(key)
if isinstance(cntrl, ListControl):
form[key] = [val]
else:
raise
return do_click(client, form, **kwargs)
#noinspection PyUnusedLocal
def chose(client, orig_response, content, path, **kwargs):
"""
Sends a HTTP GET to a url given by the present url and the given
relative path.
:param orig_response: The original response
:param content: The content of the response
:param path: The relative path to add to the base URL
:return: The response do_click() returns
"""
if not path.startswith("http"):
try:
_url = orig_response.url
except KeyError:
_url = kwargs["location"]
part = urlparse(_url)
url = "%s://%s%s" % (part[0], part[1], path)
else:
url = path
return do_request(client, url, "GET")
def post_form(client, orig_response, content, **kwargs):
"""
The same as select_form but with no possibility of change the content
of the form.
:param client: The Client instance
:param orig_response: The original response (as returned by httplib2)
:param content: The content of the response
:return: The response do_click() returns
"""
_url = orig_response.url
# content is a form to be filled in and returned
response = DResponse(status=orig_response.status_code, url=_url)
response.write(content)
form = pick_form(response, content, _url, **kwargs)
return do_click(client, form, **kwargs)
def NoneFunc():
return None
def interaction(args):
_type = args["type"]
if _type == "form":
return select_form
elif _type == "link":
return chose
else:
return NoneFunc
# ========================================================================
class Operation(object):
def __init__(self, conv, args=None, features=None):
if args:
self.function = interaction(args)
self.args = args or {}
self.request = None
self.conv = conv
self.features = features
self.cconf = conv.client_config
def update(self, dic):
self.args.update(dic)
#noinspection PyUnusedLocal
def post_op(self, result, environ, args):
pass
def __call__(self, location, response, content, feature=None):
try:
_args = self.args.copy()
except (KeyError, AttributeError):
_args = {}
_args["location"] = location
logger.info("--> FUNCTION: %s", self.function.__name__)
logger.info("--> ARGS: %s", _args)
result = self.function(self.conv.client, response, content, **_args)
self.post_op(result, self.conv, _args)
return result
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