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Given a mission

get the most popular repository in the github python trending page.
  1. Here crawl and parse the HTML from https://github.com/trending/python?since=daily
  2. Although you can get it from the api.github.com

Create a CrawlerRule

  1. Get the request args
    1. Use the URL: https://github.com/trending/python?since=daily
    2. Or copy the curl-string from chrome
      1. Chrome dev tools -> Network -> url (RClick) -> Copy -> Copy as cURL
      2. some scenes need the cookie authentication or headers anti-crawler.
      3. Copy cURL
  2. Create crawler rule
    1. Open watchdog page. Default http://127.0.0.1:9901/
    2. Click <New> tab.
    3. First step is to set the CrawlerRule's meta info.
      1. Now start to ensure the request is correct.
      2. Click <cURL Parse> link.
      3. Input the cURL string or URL got before.
      5. Then it generates the default regex & request args, maybe need some change for match more url pattern.
      6. Click <Download> button, wait for it finish downloading => Response Body [200]
        1. If after downloading, <Rule Name> is still null, need to input manually.
      7. Check the source code downloaded, ensure it is what you want.
        1. Also you can check it in the parse rules by using a rule named __schema__, the parser will raise Error except this __schema__ rule returns True.
    4. Now to set the ParseRules of this CrawlerRule.
      1. A valid CrawlerRule should contains text rule and url rule, and the url rule is optional.
      2. Delete the existing text rule, create a new parse rule named list.
      3. Create a new Parse Rule like as below:
        1. Here we got the list item for child rules.
      4. Then need two child rules named text and url for the list rule.
      5. Create a new parse rule named text like this:
        1. Click the button send the text rule to list rule.
      6. Create a new parse rule named url like text, or ignore this rule. But $text attribute should use @href for get href attribute. Also need to send this rule to list rule.
    5. OK, now click Parse button to parse this CrawlerRule, and get the result.
    6. Click the <1. Save Crawler Rule> button to save rule into database.

Parse result

{'Trending Python repositories on GitHub today · GitHub': {'list': {'text': 'gwen001 /      pentest-tools', 'url': 'https://github.com/gwen001/pentest-tools'}}}

CrawlerRule JSON. This JSON string can be loaded by clicking the <Loads> button.

{"name":"Trending Python repositories on GitHub today · GitHub","request_args":{"method":"get","url":"https://github.com/trending/python?since=daily","headers":{"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36"}},"parse_rules":[{"name":"list","chain_rules":[["css","h1.lh-condensed>a","$string"],["python","index","0"],["re","=\"/","@=\"https://github.com/"]],"child_rules":[{"name":"text","chain_rules":[["css","a","$text"],["py","index","0"],["udf","input_object.strip().replace('\\n', '')",""]],"child_rules":[],"iter_parse_child":false},{"name":"url","chain_rules":[["css","a","@href"],["python","index","0"]],"child_rules":[],"iter_parse_child":false}],"iter_parse_child":false}],"regex":"^https://github\\.com/trending/python\\?since=daily$","encoding":""}

Create a Task

  1. Click the <2. Add New Task> button.
  2. Ensure the task info.
  3. Click <Submit> button. Create task success.

Update a Task

  1. Click <Tasks> tab.
  2. Double click the task's row.
  3. Update it, submit.