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608 lines
25 KiB
608 lines
25 KiB
import hashlib
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from abc import abstractmethod
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import chardet
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import json
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import logging
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import os
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import requests
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import sys
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import time
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visualselector_xpath_selectors = 'div,span,form,table,tbody,tr,td,a,p,ul,li,h1,h2,h3,h4, header, footer, section, article, aside, details, main, nav, section, summary'
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class Non200ErrorCodeReceived(Exception):
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def __init__(self, status_code, url, screenshot=None, xpath_data=None, page_html=None):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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self.xpath_data = xpath_data
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self.page_text = None
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if page_html:
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from changedetectionio import html_tools
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self.page_text = html_tools.html_to_text(page_html)
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return
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class checksumFromPreviousCheckWasTheSame(Exception):
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def __init__(self):
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return
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class JSActionExceptions(Exception):
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def __init__(self, status_code, url, screenshot, message=''):
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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self.message = message
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return
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class BrowserStepsStepTimout(Exception):
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def __init__(self, step_n):
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self.step_n = step_n
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return
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class PageUnloadable(Exception):
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def __init__(self, status_code, url, message, screenshot=False):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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self.message = message
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return
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class EmptyReply(Exception):
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def __init__(self, status_code, url, screenshot=None):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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return
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class ScreenshotUnavailable(Exception):
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def __init__(self, status_code, url, page_html=None):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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if page_html:
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from html_tools import html_to_text
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self.page_text = html_to_text(page_html)
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return
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class ReplyWithContentButNoText(Exception):
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def __init__(self, status_code, url, screenshot=None):
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# Set this so we can use it in other parts of the app
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self.status_code = status_code
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self.url = url
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self.screenshot = screenshot
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return
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class Fetcher():
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error = None
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status_code = None
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content = None
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headers = None
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browser_steps = None
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browser_steps_screenshot_path = None
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fetcher_description = "No description"
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webdriver_js_execute_code = None
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xpath_element_js = ""
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xpath_data = None
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# Will be needed in the future by the VisualSelector, always get this where possible.
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screenshot = False
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system_http_proxy = os.getenv('HTTP_PROXY')
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system_https_proxy = os.getenv('HTTPS_PROXY')
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# Time ONTOP of the system defined env minimum time
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render_extract_delay = 0
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def __init__(self):
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from pkg_resources import resource_string
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# The code that scrapes elements and makes a list of elements/size/position to click on in the VisualSelector
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self.xpath_element_js = resource_string(__name__, "res/xpath_element_scraper.js").decode('utf-8')
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@abstractmethod
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def get_error(self):
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return self.error
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@abstractmethod
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def run(self,
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url,
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timeout,
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request_headers,
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request_body,
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request_method,
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ignore_status_codes=False,
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current_include_filters=None,
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is_binary=False):
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# Should set self.error, self.status_code and self.content
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pass
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@abstractmethod
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def quit(self):
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return
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@abstractmethod
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def get_last_status_code(self):
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return self.status_code
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@abstractmethod
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def screenshot_step(self, step_n):
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return None
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@abstractmethod
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# Return true/false if this checker is ready to run, in the case it needs todo some special config check etc
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def is_ready(self):
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return True
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def iterate_browser_steps(self):
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from changedetectionio.blueprint.browser_steps.browser_steps import steppable_browser_interface
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from playwright._impl._api_types import TimeoutError
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from jinja2 import Environment
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jinja2_env = Environment(extensions=['jinja2_time.TimeExtension'])
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step_n = 0
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if self.browser_steps is not None and len(self.browser_steps):
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interface = steppable_browser_interface()
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interface.page = self.page
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valid_steps = filter(lambda s: (s['operation'] and len(s['operation']) and s['operation'] != 'Choose one' and s['operation'] != 'Goto site'), self.browser_steps)
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for step in valid_steps:
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step_n += 1
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print(">> Iterating check - browser Step n {} - {}...".format(step_n, step['operation']))
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self.screenshot_step("before-"+str(step_n))
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self.save_step_html("before-"+str(step_n))
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try:
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optional_value = step['optional_value']
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selector = step['selector']
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# Support for jinja2 template in step values, with date module added
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if '{%' in step['optional_value'] or '{{' in step['optional_value']:
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optional_value = str(jinja2_env.from_string(step['optional_value']).render())
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if '{%' in step['selector'] or '{{' in step['selector']:
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selector = str(jinja2_env.from_string(step['selector']).render())
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getattr(interface, "call_action")(action_name=step['operation'],
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selector=selector,
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optional_value=optional_value)
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self.screenshot_step(step_n)
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self.save_step_html(step_n)
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except TimeoutError:
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# Stop processing here
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raise BrowserStepsStepTimout(step_n=step_n)
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# It's always good to reset these
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def delete_browser_steps_screenshots(self):
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import glob
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if self.browser_steps_screenshot_path is not None:
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dest = os.path.join(self.browser_steps_screenshot_path, 'step_*.jpeg')
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files = glob.glob(dest)
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for f in files:
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os.unlink(f)
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# Maybe for the future, each fetcher provides its own diff output, could be used for text, image
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# the current one would return javascript output (as we use JS to generate the diff)
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#
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def available_fetchers():
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# See the if statement at the bottom of this file for how we switch between playwright and webdriver
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import inspect
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p = []
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for name, obj in inspect.getmembers(sys.modules[__name__], inspect.isclass):
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if inspect.isclass(obj):
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# @todo html_ is maybe better as fetcher_ or something
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# In this case, make sure to edit the default one in store.py and fetch_site_status.py
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if name.startswith('html_'):
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t = tuple([name, obj.fetcher_description])
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p.append(t)
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return p
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class base_html_playwright(Fetcher):
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fetcher_description = "Playwright {}/Javascript".format(
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os.getenv("PLAYWRIGHT_BROWSER_TYPE", 'chromium').capitalize()
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)
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if os.getenv("PLAYWRIGHT_DRIVER_URL"):
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fetcher_description += " via '{}'".format(os.getenv("PLAYWRIGHT_DRIVER_URL"))
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browser_type = ''
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command_executor = ''
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# Configs for Proxy setup
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# In the ENV vars, is prefixed with "playwright_proxy_", so it is for example "playwright_proxy_server"
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playwright_proxy_settings_mappings = ['bypass', 'server', 'username', 'password']
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proxy = None
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def __init__(self, proxy_override=None):
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super().__init__()
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# .strip('"') is going to save someone a lot of time when they accidently wrap the env value
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self.browser_type = os.getenv("PLAYWRIGHT_BROWSER_TYPE", 'chromium').strip('"')
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self.command_executor = os.getenv(
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"PLAYWRIGHT_DRIVER_URL",
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'ws://playwright-chrome:3000'
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).strip('"')
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# If any proxy settings are enabled, then we should setup the proxy object
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proxy_args = {}
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for k in self.playwright_proxy_settings_mappings:
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v = os.getenv('playwright_proxy_' + k, False)
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if v:
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proxy_args[k] = v.strip('"')
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if proxy_args:
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self.proxy = proxy_args
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# allow per-watch proxy selection override
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if proxy_override:
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self.proxy = {'server': proxy_override}
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if self.proxy:
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# Playwright needs separate username and password values
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from urllib.parse import urlparse
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parsed = urlparse(self.proxy.get('server'))
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if parsed.username:
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self.proxy['username'] = parsed.username
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self.proxy['password'] = parsed.password
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def screenshot_step(self, step_n=''):
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# There's a bug where we need to do it twice or it doesnt take the whole page, dont know why.
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self.page.screenshot(type='jpeg', clip={'x': 1.0, 'y': 1.0, 'width': 1280, 'height': 1024})
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screenshot = self.page.screenshot(type='jpeg', full_page=True, quality=85)
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if self.browser_steps_screenshot_path is not None:
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destination = os.path.join(self.browser_steps_screenshot_path, 'step_{}.jpeg'.format(step_n))
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logging.debug("Saving step screenshot to {}".format(destination))
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with open(destination, 'wb') as f:
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f.write(screenshot)
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def save_step_html(self, step_n):
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content = self.page.content()
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destination = os.path.join(self.browser_steps_screenshot_path, 'step_{}.html'.format(step_n))
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logging.debug("Saving step HTML to {}".format(destination))
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with open(destination, 'w') as f:
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f.write(content)
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def run(self,
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url,
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timeout,
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request_headers,
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request_body,
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request_method,
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ignore_status_codes=False,
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current_include_filters=None,
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is_binary=False):
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from playwright.sync_api import sync_playwright
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import playwright._impl._api_types
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self.delete_browser_steps_screenshots()
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response = None
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with sync_playwright() as p:
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browser_type = getattr(p, self.browser_type)
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# Seemed to cause a connection Exception even tho I can see it connect
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# self.browser = browser_type.connect(self.command_executor, timeout=timeout*1000)
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# 60,000 connection timeout only
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browser = browser_type.connect_over_cdp(self.command_executor, timeout=60000)
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# Set user agent to prevent Cloudflare from blocking the browser
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# Use the default one configured in the App.py model that's passed from fetch_site_status.py
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context = browser.new_context(
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user_agent=request_headers['User-Agent'] if request_headers.get('User-Agent') else 'Mozilla/5.0',
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proxy=self.proxy,
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# This is needed to enable JavaScript execution on GitHub and others
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bypass_csp=True,
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# Can't think why we need the service workers for our use case?
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service_workers='block',
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# Should never be needed
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accept_downloads=False
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)
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self.page = context.new_page()
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if len(request_headers):
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context.set_extra_http_headers(request_headers)
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self.page.set_default_navigation_timeout(90000)
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self.page.set_default_timeout(90000)
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# Listen for all console events and handle errors
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self.page.on("console", lambda msg: print(f"Playwright console: Watch URL: {url} {msg.type}: {msg.text} {msg.args}"))
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# Goto page
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try:
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# Wait_until = commit
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# - `'commit'` - consider operation to be finished when network response is received and the document started loading.
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# Better to not use any smarts from Playwright and just wait an arbitrary number of seconds
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# This seemed to solve nearly all 'TimeoutErrors'
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response = self.page.goto(url, wait_until='commit')
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except playwright._impl._api_types.Error as e:
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# Retry once - https://github.com/browserless/chrome/issues/2485
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# Sometimes errors related to invalid cert's and other can be random
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print ("Content Fetcher > retrying request got error - ", str(e))
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time.sleep(1)
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response = self.page.goto(url, wait_until='commit')
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except Exception as e:
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print ("Content Fetcher > Other exception when page.goto", str(e))
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context.close()
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browser.close()
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raise PageUnloadable(url=url, status_code=None, message=str(e))
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# Execute any browser steps
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try:
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extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
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self.page.wait_for_timeout(extra_wait * 1000)
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if self.webdriver_js_execute_code is not None and len(self.webdriver_js_execute_code):
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self.page.evaluate(self.webdriver_js_execute_code)
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except playwright._impl._api_types.TimeoutError as e:
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context.close()
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browser.close()
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# This can be ok, we will try to grab what we could retrieve
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pass
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except Exception as e:
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print ("Content Fetcher > Other exception when executing custom JS code", str(e))
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context.close()
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browser.close()
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raise PageUnloadable(url=url, status_code=None, message=str(e))
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if response is None:
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context.close()
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browser.close()
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print ("Content Fetcher > Response object was none")
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raise EmptyReply(url=url, status_code=None)
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# Bug 2(?) Set the viewport size AFTER loading the page
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self.page.set_viewport_size({"width": 1280, "height": 1024})
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# Run Browser Steps here
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self.iterate_browser_steps()
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extra_wait = int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay
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time.sleep(extra_wait)
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self.content = self.page.content()
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self.status_code = response.status
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if len(self.page.content().strip()) == 0:
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context.close()
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browser.close()
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print ("Content Fetcher > Content was empty")
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raise EmptyReply(url=url, status_code=response.status)
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# Bug 2(?) Set the viewport size AFTER loading the page
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self.page.set_viewport_size({"width": 1280, "height": 1024})
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self.status_code = response.status
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self.content = self.page.content()
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self.headers = response.all_headers()
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# So we can find an element on the page where its selector was entered manually (maybe not xPath etc)
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if current_include_filters is not None:
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self.page.evaluate("var include_filters={}".format(json.dumps(current_include_filters)))
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else:
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self.page.evaluate("var include_filters=''")
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self.xpath_data = self.page.evaluate("async () => {" + self.xpath_element_js.replace('%ELEMENTS%', visualselector_xpath_selectors) + "}")
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# Bug 3 in Playwright screenshot handling
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# Some bug where it gives the wrong screenshot size, but making a request with the clip set first seems to solve it
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# JPEG is better here because the screenshots can be very very large
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# Screenshots also travel via the ws:// (websocket) meaning that the binary data is base64 encoded
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# which will significantly increase the IO size between the server and client, it's recommended to use the lowest
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# acceptable screenshot quality here
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try:
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# Quality set to 1 because it's not used, just used as a work-around for a bug, no need to change this.
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self.page.screenshot(type='jpeg', clip={'x': 1.0, 'y': 1.0, 'width': 1280, 'height': 1024}, quality=1)
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# The actual screenshot
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self.screenshot = self.page.screenshot(type='jpeg', full_page=True, quality=int(os.getenv("PLAYWRIGHT_SCREENSHOT_QUALITY", 72)))
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except Exception as e:
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context.close()
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browser.close()
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raise ScreenshotUnavailable(url=url, status_code=None)
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context.close()
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browser.close()
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class base_html_webdriver(Fetcher):
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if os.getenv("WEBDRIVER_URL"):
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fetcher_description = "WebDriver Chrome/Javascript via '{}'".format(os.getenv("WEBDRIVER_URL"))
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else:
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fetcher_description = "WebDriver Chrome/Javascript"
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command_executor = ''
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# Configs for Proxy setup
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# In the ENV vars, is prefixed with "webdriver_", so it is for example "webdriver_sslProxy"
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selenium_proxy_settings_mappings = ['proxyType', 'ftpProxy', 'httpProxy', 'noProxy',
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'proxyAutoconfigUrl', 'sslProxy', 'autodetect',
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'socksProxy', 'socksVersion', 'socksUsername', 'socksPassword']
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proxy = None
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def __init__(self, proxy_override=None):
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super().__init__()
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from selenium.webdriver.common.proxy import Proxy as SeleniumProxy
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# .strip('"') is going to save someone a lot of time when they accidently wrap the env value
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self.command_executor = os.getenv("WEBDRIVER_URL", 'http://browser-chrome:4444/wd/hub').strip('"')
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# If any proxy settings are enabled, then we should setup the proxy object
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proxy_args = {}
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for k in self.selenium_proxy_settings_mappings:
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v = os.getenv('webdriver_' + k, False)
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if v:
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proxy_args[k] = v.strip('"')
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# Map back standard HTTP_ and HTTPS_PROXY to webDriver httpProxy/sslProxy
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if not proxy_args.get('webdriver_httpProxy') and self.system_http_proxy:
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proxy_args['httpProxy'] = self.system_http_proxy
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if not proxy_args.get('webdriver_sslProxy') and self.system_https_proxy:
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proxy_args['httpsProxy'] = self.system_https_proxy
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# Allows override the proxy on a per-request basis
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if proxy_override is not None:
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proxy_args['httpProxy'] = proxy_override
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if proxy_args:
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self.proxy = SeleniumProxy(raw=proxy_args)
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def run(self,
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url,
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timeout,
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request_headers,
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request_body,
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request_method,
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ignore_status_codes=False,
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current_include_filters=None,
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is_binary=False):
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from selenium import webdriver
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from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
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from selenium.common.exceptions import WebDriverException
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# request_body, request_method unused for now, until some magic in the future happens.
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# check env for WEBDRIVER_URL
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self.driver = webdriver.Remote(
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command_executor=self.command_executor,
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desired_capabilities=DesiredCapabilities.CHROME,
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|
proxy=self.proxy)
|
|
|
|
try:
|
|
self.driver.get(url)
|
|
except WebDriverException as e:
|
|
# Be sure we close the session window
|
|
self.quit()
|
|
raise
|
|
|
|
self.driver.set_window_size(1280, 1024)
|
|
self.driver.implicitly_wait(int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)))
|
|
|
|
if self.webdriver_js_execute_code is not None:
|
|
self.driver.execute_script(self.webdriver_js_execute_code)
|
|
# Selenium doesn't automatically wait for actions as good as Playwright, so wait again
|
|
self.driver.implicitly_wait(int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)))
|
|
|
|
# @todo - how to check this? is it possible?
|
|
self.status_code = 200
|
|
# @todo somehow we should try to get this working for WebDriver
|
|
# raise EmptyReply(url=url, status_code=r.status_code)
|
|
|
|
# @todo - dom wait loaded?
|
|
time.sleep(int(os.getenv("WEBDRIVER_DELAY_BEFORE_CONTENT_READY", 5)) + self.render_extract_delay)
|
|
self.content = self.driver.page_source
|
|
self.headers = {}
|
|
|
|
self.screenshot = self.driver.get_screenshot_as_png()
|
|
|
|
# Does the connection to the webdriver work? run a test connection.
|
|
def is_ready(self):
|
|
from selenium import webdriver
|
|
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
|
|
|
|
self.driver = webdriver.Remote(
|
|
command_executor=self.command_executor,
|
|
desired_capabilities=DesiredCapabilities.CHROME)
|
|
|
|
# driver.quit() seems to cause better exceptions
|
|
self.quit()
|
|
return True
|
|
|
|
def quit(self):
|
|
if self.driver:
|
|
try:
|
|
self.driver.quit()
|
|
except Exception as e:
|
|
print("Content Fetcher > Exception in chrome shutdown/quit" + str(e))
|
|
|
|
|
|
# "html_requests" is listed as the default fetcher in store.py!
|
|
class html_requests(Fetcher):
|
|
fetcher_description = "Basic fast Plaintext/HTTP Client"
|
|
|
|
def __init__(self, proxy_override=None):
|
|
self.proxy_override = proxy_override
|
|
|
|
def run(self,
|
|
url,
|
|
timeout,
|
|
request_headers,
|
|
request_body,
|
|
request_method,
|
|
ignore_status_codes=False,
|
|
current_include_filters=None,
|
|
is_binary=False):
|
|
|
|
# Make requests use a more modern looking user-agent
|
|
if not 'User-Agent' in request_headers:
|
|
request_headers['User-Agent'] = os.getenv("DEFAULT_SETTINGS_HEADERS_USERAGENT",
|
|
'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36')
|
|
|
|
proxies = {}
|
|
|
|
# Allows override the proxy on a per-request basis
|
|
if self.proxy_override:
|
|
proxies = {'http': self.proxy_override, 'https': self.proxy_override, 'ftp': self.proxy_override}
|
|
else:
|
|
if self.system_http_proxy:
|
|
proxies['http'] = self.system_http_proxy
|
|
if self.system_https_proxy:
|
|
proxies['https'] = self.system_https_proxy
|
|
|
|
r = requests.request(method=request_method,
|
|
data=request_body,
|
|
url=url,
|
|
headers=request_headers,
|
|
timeout=timeout,
|
|
proxies=proxies,
|
|
verify=False)
|
|
|
|
# If the response did not tell us what encoding format to expect, Then use chardet to override what `requests` thinks.
|
|
# For example - some sites don't tell us it's utf-8, but return utf-8 content
|
|
# This seems to not occur when using webdriver/selenium, it seems to detect the text encoding more reliably.
|
|
# https://github.com/psf/requests/issues/1604 good info about requests encoding detection
|
|
if not is_binary:
|
|
# Don't run this for PDF (and requests identified as binary) takes a _long_ time
|
|
if not r.headers.get('content-type') or not 'charset=' in r.headers.get('content-type'):
|
|
encoding = chardet.detect(r.content)['encoding']
|
|
if encoding:
|
|
r.encoding = encoding
|
|
|
|
if not r.content or not len(r.content):
|
|
raise EmptyReply(url=url, status_code=r.status_code)
|
|
|
|
# @todo test this
|
|
# @todo maybe you really want to test zero-byte return pages?
|
|
if r.status_code != 200 and not ignore_status_codes:
|
|
# maybe check with content works?
|
|
raise Non200ErrorCodeReceived(url=url, status_code=r.status_code, page_html=r.text)
|
|
|
|
self.status_code = r.status_code
|
|
if is_binary:
|
|
# Binary files just return their checksum until we add something smarter
|
|
self.content = hashlib.md5(r.content).hexdigest()
|
|
else:
|
|
self.content = r.text
|
|
|
|
self.headers = r.headers
|
|
self.raw_content = r.content
|
|
|
|
|
|
# Decide which is the 'real' HTML webdriver, this is more a system wide config
|
|
# rather than site-specific.
|
|
use_playwright_as_chrome_fetcher = os.getenv('PLAYWRIGHT_DRIVER_URL', False)
|
|
if use_playwright_as_chrome_fetcher:
|
|
html_webdriver = base_html_playwright
|
|
else:
|
|
html_webdriver = base_html_webdriver
|