Rename State -> Session
This commit is contained in:
Mads Marquart
296
fbchat/_session.py
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296
fbchat/_session.py
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import attr
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import bs4
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import re
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import requests
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import random
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import urllib.parse
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from ._core import log, attrs_default
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from . import _graphql, _util, _exception
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FB_DTSG_REGEX = re.compile(r'name="fb_dtsg" value="(.*?)"')
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def get_user_id(session):
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# TODO: Optimize this `.get_dict()` call!
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rtn = session.cookies.get_dict().get("c_user")
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if rtn is None:
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raise _exception.FBchatException("Could not find user id")
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return str(rtn)
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def find_input_fields(html):
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return bs4.BeautifulSoup(html, "html.parser", parse_only=bs4.SoupStrainer("input"))
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def session_factory():
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session = requests.session()
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session.headers["Referer"] = "https://www.facebook.com"
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# TODO: Deprecate setting the user agent manually
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session.headers["User-Agent"] = random.choice(_util.USER_AGENTS)
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return session
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def client_id_factory():
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return hex(int(random.random() * 2 ** 31))[2:]
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def is_home(url):
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parts = urllib.parse.urlparse(url)
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# Check the urls `/home.php` and `/`
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return "home" in parts.path or "/" == parts.path
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def _2fa_helper(session, code, r):
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soup = find_input_fields(r.text)
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data = dict()
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url = "https://m.facebook.com/login/checkpoint/"
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data["approvals_code"] = code
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data["fb_dtsg"] = soup.find("input", {"name": "fb_dtsg"})["value"]
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data["nh"] = soup.find("input", {"name": "nh"})["value"]
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data["submit[Submit Code]"] = "Submit Code"
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data["codes_submitted"] = 0
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log.info("Submitting 2FA code.")
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r = session.post(url, data=data)
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if is_home(r.url):
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return r
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del data["approvals_code"]
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del data["submit[Submit Code]"]
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del data["codes_submitted"]
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data["name_action_selected"] = "save_device"
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data["submit[Continue]"] = "Continue"
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log.info("Saving browser.")
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# At this stage, we have dtsg, nh, name_action_selected, submit[Continue]
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r = session.post(url, data=data)
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if is_home(r.url):
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return r
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del data["name_action_selected"]
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log.info("Starting Facebook checkup flow.")
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# At this stage, we have dtsg, nh, submit[Continue]
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r = session.post(url, data=data)
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if is_home(r.url):
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return r
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del data["submit[Continue]"]
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data["submit[This was me]"] = "This Was Me"
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log.info("Verifying login attempt.")
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# At this stage, we have dtsg, nh, submit[This was me]
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r = session.post(url, data=data)
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if is_home(r.url):
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return r
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del data["submit[This was me]"]
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data["submit[Continue]"] = "Continue"
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data["name_action_selected"] = "save_device"
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log.info("Saving device again.")
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# At this stage, we have dtsg, nh, submit[Continue], name_action_selected
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r = session.post(url, data=data)
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return r
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@attrs_default
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class Session:
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"""Stores and manages state required for most Facebook requests."""
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user_id = attr.ib()
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_fb_dtsg = attr.ib()
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_revision = attr.ib()
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_session = attr.ib(factory=session_factory)
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_counter = attr.ib(0)
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_client_id = attr.ib(factory=client_id_factory)
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_logout_h = attr.ib(None)
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def get_params(self):
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self._counter += 1 # TODO: Make this operation atomic / thread-safe
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return {
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"__a": 1,
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"__req": _util.str_base(self._counter, 36),
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"__rev": self._revision,
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"fb_dtsg": self._fb_dtsg,
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}
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@classmethod
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def login(cls, email, password, on_2fa_callback):
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session = session_factory()
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soup = find_input_fields(session.get("https://m.facebook.com/").text)
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data = dict(
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(elem["name"], elem["value"])
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for elem in soup
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if elem.has_attr("value") and elem.has_attr("name")
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)
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data["email"] = email
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data["pass"] = password
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data["login"] = "Log In"
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r = session.post("https://m.facebook.com/login.php?login_attempt=1", data=data)
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# Usually, 'Checkpoint' will refer to 2FA
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if "checkpoint" in r.url and ('id="approvals_code"' in r.text.lower()):
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code = on_2fa_callback()
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r = _2fa_helper(session, code, r)
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# Sometimes Facebook tries to show the user a "Save Device" dialog
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if "save-device" in r.url:
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r = session.get("https://m.facebook.com/login/save-device/cancel/")
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if is_home(r.url):
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return cls.from_session(session=session)
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else:
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raise _exception.FBchatException(
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"Login failed. Check email/password. "
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"(Failed on url: {})".format(r.url)
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)
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def is_logged_in(self):
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# Send a request to the login url, to see if we're directed to the home page
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url = "https://m.facebook.com/login.php?login_attempt=1"
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r = self._session.get(url, allow_redirects=False)
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return "Location" in r.headers and is_home(r.headers["Location"])
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def logout(self):
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logout_h = self._logout_h
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if not logout_h:
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url = _util.prefix_url("/bluebar/modern_settings_menu/")
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h_r = self._session.post(url, data={"pmid": "4"})
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logout_h = re.search(r'name=\\"h\\" value=\\"(.*?)\\"', h_r.text).group(1)
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url = _util.prefix_url("/logout.php")
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return self._session.get(url, params={"ref": "mb", "h": logout_h}).ok
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@classmethod
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def from_session(cls, session):
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# TODO: Automatically set user_id when the cookie changes in the session
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user_id = get_user_id(session)
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r = session.get(_util.prefix_url("/"))
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soup = find_input_fields(r.text)
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fb_dtsg_element = soup.find("input", {"name": "fb_dtsg"})
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if fb_dtsg_element:
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fb_dtsg = fb_dtsg_element["value"]
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else:
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# Fall back to searching with a regex
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fb_dtsg = FB_DTSG_REGEX.search(r.text).group(1)
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revision = int(r.text.split('"client_revision":', 1)[1].split(",", 1)[0])
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logout_h_element = soup.find("input", {"name": "h"})
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logout_h = logout_h_element["value"] if logout_h_element else None
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return cls(
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user_id=user_id,
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fb_dtsg=fb_dtsg,
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revision=revision,
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session=session,
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logout_h=logout_h,
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)
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def get_cookies(self):
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return self._session.cookies.get_dict()
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@classmethod
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def from_cookies(cls, cookies):
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session = session_factory()
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session.cookies = requests.cookies.merge_cookies(session.cookies, cookies)
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return cls.from_session(session=session)
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def _get(self, url, params, error_retries=3):
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params.update(self.get_params())
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r = self._session.get(_util.prefix_url(url), params=params)
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content = _util.check_request(r)
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return _util.to_json(content)
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def _post(self, url, data, files=None, as_graphql=False):
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data.update(self.get_params())
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r = self._session.post(_util.prefix_url(url), data=data, files=files)
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content = _util.check_request(r)
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if as_graphql:
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return _graphql.response_to_json(content)
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else:
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return _util.to_json(content)
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def _payload_post(self, url, data, files=None):
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j = self._post(url, data, files=files)
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_util.handle_payload_error(j)
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try:
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return j["payload"]
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except (KeyError, TypeError):
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raise _exception.FBchatException("Missing payload: {}".format(j))
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def _graphql_requests(self, *queries):
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data = {
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"method": "GET",
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"response_format": "json",
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"queries": _graphql.queries_to_json(*queries),
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}
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return self._post("/api/graphqlbatch/", data, as_graphql=True)
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def _upload(self, files, voice_clip=False):
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"""Upload files to Facebook.
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`files` should be a list of files that requests can upload, see
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`requests.request <https://docs.python-requests.org/en/master/api/#requests.request>`_.
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Return a list of tuples with a file's ID and mimetype.
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"""
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file_dict = {"upload_{}".format(i): f for i, f in enumerate(files)}
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data = {"voice_clip": voice_clip}
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j = self._payload_post(
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"https://upload.facebook.com/ajax/mercury/upload.php", data, files=file_dict
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)
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if len(j["metadata"]) != len(files):
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raise _exception.FBchatException(
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"Some files could not be uploaded: {}, {}".format(j, files)
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)
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return [
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(data[_util.mimetype_to_key(data["filetype"])], data["filetype"])
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for data in j["metadata"]
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]
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def _do_send_request(self, data):
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offline_threading_id = _util.generate_offline_threading_id()
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data["client"] = "mercury"
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data["author"] = "fbid:{}".format(self.user_id)
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data["timestamp"] = _util.now()
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data["source"] = "source:chat:web"
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data["offline_threading_id"] = offline_threading_id
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data["message_id"] = offline_threading_id
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data["threading_id"] = _util.generate_message_id(self._client_id)
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data["ephemeral_ttl_mode:"] = "0"
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j = self._post("/messaging/send/", data)
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# update JS token if received in response
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fb_dtsg = _util.get_jsmods_require(j, 2)
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if fb_dtsg is not None:
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self._fb_dtsg = fb_dtsg
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try:
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message_ids = [
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(action["message_id"], action["thread_fbid"])
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for action in j["payload"]["actions"]
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if "message_id" in action
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]
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if len(message_ids) != 1:
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log.warning("Got multiple message ids' back: {}".format(message_ids))
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return message_ids[0]
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except (KeyError, IndexError, TypeError) as e:
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raise _exception.FBchatException(
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"Error when sending message: "
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"No message IDs could be found: {}".format(j)
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)
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