feat: 知乎支持（关键词、评论）

media_platform/zhihu/help.py

@@ -0,0 +1,256 @@
+# -*- coding: utf-8 -*-
+from typing import Dict, List
+from urllib.parse import parse_qs, urlparse
+
+import execjs
+
+from constant import zhihu as zhihu_constant
+from model.m_zhihu import ZhihuComment, ZhihuContent, ZhihuCreator
+from tools.crawler_util import extract_text_from_html
+
+ZHIHU_SGIN_JS = None
+
+
+def sign(url: str, cookies: str) -> Dict:
+    """
+    zhihu sign algorithm
+    Args:
+        url: request url with query string
+        cookies: request cookies with d_c0 key
+
+    Returns:
+
+    """
+    global ZHIHU_SGIN_JS
+    if not ZHIHU_SGIN_JS:
+        with open("libs/zhihu.js", "r") as f:
+            ZHIHU_SGIN_JS = execjs.compile(f.read())
+
+    return ZHIHU_SGIN_JS.call("get_sign", url, cookies)
+
+
+class ZhiHuJsonExtractor:
+    def __init__(self):
+        pass
+
+    def extract_contents(self, json_data: Dict) -> List[ZhihuContent]:
+        """
+        extract zhihu contents
+        Args:
+            json_data: zhihu json data
+
+        Returns:
+
+        """
+        if not json_data:
+            return []
+
+        result: List[ZhihuContent] = []
+        search_result: List[Dict] = json_data.get("data", [])
+        search_result = [s_item for s_item in search_result if s_item.get("type") in ['search_result', 'zvideo']]
+        for sr_item in search_result:
+            sr_object: Dict = sr_item.get("object", {})
+            if sr_object.get("type") == zhihu_constant.ANSWER_NAME:
+                result.append(self._extract_answer_content(sr_object))
+            elif sr_object.get("type") == zhihu_constant.ARTICLE_NAME:
+                result.append(self._extract_article_content(sr_object))
+            elif sr_object.get("type") == zhihu_constant.VIDEO_NAME:
+                result.append(self._extract_zvideo_content(sr_object))
+            else:
+                continue
+
+        return result
+
+    def _extract_answer_content(self, answer: Dict) -> ZhihuContent:
+        """
+        extract zhihu answer content
+        Args:
+            answer: zhihu answer
+
+        Returns:
+        """
+        res = ZhihuContent()
+        res.content_id = answer.get("id")
+        res.content_type = answer.get("type")
+        res.content_text = extract_text_from_html(answer.get("content"))
+        res.question_id = answer.get("question").get("id")
+        res.content_url = f"{zhihu_constant.ZHIHU_URL}/question/{res.question_id}/answer/{res.content_id}"
+        res.title = extract_text_from_html(answer.get("title"))
+        res.desc = extract_text_from_html(answer.get("description"))
+        res.created_time = answer.get("created_time")
+        res.updated_time = answer.get("updated_time")
+        res.voteup_count = answer.get("voteup_count")
+        res.comment_count = answer.get("comment_count")
+
+        # extract author info
+        author_info = self._extract_author(answer.get("author"))
+        res.user_id = author_info.user_id
+        res.user_link = author_info.user_link
+        res.user_nickname = author_info.user_nickname
+        res.user_avatar = author_info.user_avatar
+        return res
+
+    def _extract_article_content(self, article: Dict) -> ZhihuContent:
+        """
+        extract zhihu article content
+        Args:
+            article: zhihu article
+
+        Returns:
+
+        """
+        res = ZhihuContent()
+        res.content_id = article.get("id")
+        res.content_type = article.get("type")
+        res.content_text = extract_text_from_html(article.get("content"))
+        res.content_url = f"{zhihu_constant.ZHIHU_URL}/p/{res.content_id}"
+        res.title = extract_text_from_html(article.get("title"))
+        res.desc = extract_text_from_html(article.get("excerpt"))
+        res.created_time = article.get("created_time")
+        res.updated_time = article.get("updated_time")
+        res.voteup_count = article.get("voteup_count")
+        res.comment_count = article.get("comment_count")
+
+        # extract author info
+        author_info = self._extract_author(article.get("author"))
+        res.user_id = author_info.user_id
+        res.user_link = author_info.user_link
+        res.user_nickname = author_info.user_nickname
+        res.user_avatar = author_info.user_avatar
+        return res
+
+    def _extract_zvideo_content(self, zvideo: Dict) -> ZhihuContent:
+        """
+        extract zhihu zvideo content
+        Args:
+            zvideo:
+
+        Returns:
+
+        """
+        res = ZhihuContent()
+        res.content_id = zvideo.get("zvideo_id")
+        res.content_type = zvideo.get("type")
+        res.content_url = zvideo.get("video_url")
+        res.title = extract_text_from_html(zvideo.get("title"))
+        res.desc = extract_text_from_html(zvideo.get("description"))
+        res.created_time = zvideo.get("created_at")
+        res.voteup_count = zvideo.get("voteup_count")
+        res.comment_count = zvideo.get("comment_count")
+
+        # extract author info
+        author_info = self._extract_author(zvideo.get("author"))
+        res.user_id = author_info.user_id
+        res.user_link = author_info.user_link
+        res.user_nickname = author_info.user_nickname
+        res.user_avatar = author_info.user_avatar
+        return res
+
+    @staticmethod
+    def _extract_author(author: Dict) -> ZhihuCreator:
+        """
+        extract zhihu author
+        Args:
+            author:
+
+        Returns:
+
+        """
+        res = ZhihuCreator()
+        if not author:
+            return res
+        if not author.get("id"):
+            author = author.get("member")
+        res.user_id = author.get("id")
+        res.user_link = f"{zhihu_constant.ZHIHU_URL}/people/{author.get('url_token')}"
+        res.user_nickname = author.get("name")
+        res.user_avatar = author.get("avatar_url")
+        return res
+
+    def extract_comments(self, page_content: ZhihuContent, comments: List[Dict]) -> List[ZhihuComment]:
+        """
+        extract zhihu comments
+        Args:
+            page_content: zhihu content object
+            comments: zhihu comments
+
+        Returns:
+
+        """
+        if not comments:
+            return []
+        res: List[ZhihuComment] = []
+        for comment in comments:
+            if comment.get("type") != "comment":
+                continue
+            res.append(self._extract_comment(page_content, comment))
+        return res
+
+    def _extract_comment(self, page_content: ZhihuContent, comment: Dict) -> ZhihuComment:
+        """
+        extract zhihu comment
+        Args:
+            page_content: comment with content object
+            comment: zhihu comment
+
+        Returns:
+
+        """
+        res = ZhihuComment()
+        res.comment_id = str(comment.get("id", ""))
+        res.parent_comment_id = comment.get("reply_comment_id")
+        res.content = extract_text_from_html(comment.get("content"))
+        res.publish_time = comment.get("created_time")
+        res.ip_location = self._extract_comment_ip_location(comment.get("comment_tag", []))
+        res.sub_comment_count = comment.get("child_comment_count")
+        res.like_count = comment.get("like_count") if comment.get("like_count") else 0
+        res.dislike_count = comment.get("dislike_count") if comment.get("dislike_count") else 0
+        res.content_id = page_content.content_id
+        res.content_type = page_content.content_type
+
+        # extract author info
+        author_info = self._extract_author(comment.get("author"))
+        res.user_id = author_info.user_id
+        res.user_link = author_info.user_link
+        res.user_nickname = author_info.user_nickname
+        res.user_avatar = author_info.user_avatar
+        return res
+
+    @staticmethod
+    def _extract_comment_ip_location(comment_tags: List[Dict]) -> str:
+        """
+        extract comment ip location
+        Args:
+            comment_tags:
+
+        Returns:
+
+        """
+        if not comment_tags:
+            return ""
+
+        for ct in comment_tags:
+            if ct.get("type") == "ip_info":
+                return ct.get("text")
+
+        return ""
+
+    @staticmethod
+    def extract_offset(paging_info: Dict) -> str:
+        """
+        extract offset
+        Args:
+            paging_info:
+
+        Returns:
+
+        """
+        # https://www.zhihu.com/api/v4/comment_v5/zvideos/1424368906836807681/root_comment?limit=10&offset=456770961_10125996085_0&order_by=score
+        next_url = paging_info.get("next")
+        if not next_url:
+            return ""
+
+        parsed_url = urlparse(next_url)
+        query_params = parse_qs(parsed_url.query)
+        offset = query_params.get('offset', [""])[0]
+        return offset