MediaCrawler/media_platform/xhs/client.py

import asyncio
import json
from typing import Callable, Dict, List, Optional
from urllib.parse import urlencode

import httpx
from playwright.async_api import BrowserContext, Page

from tools import utils

from .exception import DataFetchError, IPBlockError
from .field import SearchNoteType, SearchSortType
from .help import get_search_id, sign


class XHSClient:
    def __init__(
            self,
            timeout=10,
            proxies=None,
            *,
            headers: Dict[str, str],
            playwright_page: Page,
            cookie_dict: Dict[str, str],
    ):
        self.proxies = proxies
        self.timeout = timeout
        self.headers = headers
        self._host = "https://edith.xiaohongshu.com"
        self.IP_ERROR_STR = "网络连接异常，请检查网络设置或重启试试"
        self.IP_ERROR_CODE = 300012
        self.NOTE_ABNORMAL_STR = "笔记状态异常，请稍后查看"
        self.NOTE_ABNORMAL_CODE = -510001
        self.playwright_page = playwright_page
        self.cookie_dict = cookie_dict

    async def _pre_headers(self, url: str, data=None) -> Dict:
        """
        请求头参数签名
        Args:
            url:
            data:

        Returns:

        """
        encrypt_params = await self.playwright_page.evaluate("([url, data]) => window._webmsxyw(url,data)", [url, data])
        local_storage = await self.playwright_page.evaluate("() => window.localStorage")
        signs = sign(
            a1=self.cookie_dict.get("a1", ""),
            b1=local_storage.get("b1", ""),
            x_s=encrypt_params.get("X-s", ""),
            x_t=str(encrypt_params.get("X-t", ""))
        )

        headers = {
            "X-S": signs["x-s"],
            "X-T": signs["x-t"],
            "x-S-Common": signs["x-s-common"],
            "X-B3-Traceid": signs["x-b3-traceid"]
        }
        self.headers.update(headers)
        return self.headers

    async def request(self, method, url, **kwargs) -> Dict:
        """
        封装httpx的公共请求方法，对请求响应做一些处理
        Args:
            method: 请求方法
            url: 请求的URL
            **kwargs: 其他请求参数，例如请求头、请求体等

        Returns:

        """
        async with httpx.AsyncClient(proxies=self.proxies) as client:
            response = await client.request(
                method, url, timeout=self.timeout,
                **kwargs
            )
        data: Dict = response.json()
        if data["success"]:
            return data.get("data", data.get("success", {}))
        elif data["code"] == self.IP_ERROR_CODE:
            raise IPBlockError(self.IP_ERROR_STR)
        else:
            raise DataFetchError(data.get("msg", None))

    async def get(self, uri: str, params=None) -> Dict:
        """
        GET请求，对请求头签名
        Args:
            uri: 请求路由
            params: 请求参数

        Returns:

        """
        final_uri = uri
        if isinstance(params, dict):
            final_uri = (f"{uri}?"
                         f"{urlencode(params)}")
        headers = await self._pre_headers(final_uri)
        return await self.request(method="GET", url=f"{self._host}{final_uri}", headers=headers)

    async def post(self, uri: str, data: dict) -> Dict:
        """
        POST请求，对请求头签名
        Args:
            uri: 请求路由
            data: 请求体参数

        Returns:

        """
        headers = await self._pre_headers(uri, data)
        json_str = json.dumps(data, separators=(',', ':'), ensure_ascii=False)
        return await self.request(method="POST", url=f"{self._host}{uri}",
                                  data=json_str, headers=headers)

    async def pong(self) -> bool:
        """
        用于检查登录态是否失效了
        Returns:

        """
        """get a note to check if login state is ok"""
        utils.logger.info("[XHSClient.pong] Begin to pong xhs...")
        ping_flag = False
        try:
            note_card: Dict = await self.get_note_by_keyword(keyword="小红书")
            if note_card.get("items"):
                ping_flag = True
        except Exception as e:
            utils.logger.error(f"[XHSClient.pong] Ping xhs failed: {e}, and try to login again...")
            ping_flag = False
        return ping_flag

    async def update_cookies(self, browser_context: BrowserContext):
        """
        API客户端提供的更新cookies方法，一般情况下登录成功后会调用此方法
        Args:
            browser_context: 浏览器上下文对象

        Returns:

        """
        cookie_str, cookie_dict = utils.convert_cookies(await browser_context.cookies())
        self.headers["Cookie"] = cookie_str
        self.cookie_dict = cookie_dict

    async def get_note_by_keyword(
            self, keyword: str,
            page: int = 1, page_size: int = 20,
            sort: SearchSortType = SearchSortType.GENERAL,
            note_type: SearchNoteType = SearchNoteType.ALL
    ) -> Dict:
        """
        根据关键词搜索笔记
        Args:
            keyword: 关键词参数
            page: 分页第几页
            page_size: 分页数据长度
            sort: 搜索结果排序指定
            note_type: 搜索的笔记类型

        Returns:

        """
        uri = "/api/sns/web/v1/search/notes"
        data = {
            "keyword": keyword,
            "page": page,
            "page_size": page_size,
            "search_id": get_search_id(),
            "sort": sort.value,
            "note_type": note_type.value
        }
        return await self.post(uri, data)

    async def get_note_by_id(self, note_id: str) -> Dict:
        """
        获取笔记详情API
        Args:
            note_id:笔记ID

        Returns:

        """
        data = {"source_note_id": note_id}
        uri = "/api/sns/web/v1/feed"
        res = await self.post(uri, data)
        if res and res.get("items"):
            res_dict: Dict = res["items"][0]["note_card"]
            return res_dict
        utils.logger.error(f"[XHSClient.get_note_by_id] get note empty and res:{res}")
        return dict()

    async def get_note_comments(self, note_id: str, cursor: str = "") -> Dict:
        """
        获取一级评论的API
        Args:
            note_id: 笔记ID
            cursor: 分页游标

        Returns:

        """
        uri = "/api/sns/web/v2/comment/page"
        params = {
            "note_id": note_id,
            "cursor": cursor
        }
        return await self.get(uri, params)

    async def get_note_sub_comments(self, note_id: str, root_comment_id: str, num: int = 30, cursor: str = ""):
        """
        获取指定父评论下的子评论的API
        Args:
            note_id: 子评论的帖子ID
            root_comment_id: 根评论ID
            num: 分页数量
            cursor: 分页游标

        Returns:

        """
        uri = "/api/sns/web/v2/comment/sub/page"
        params = {
            "note_id": note_id,
            "root_comment_id": root_comment_id,
            "num": num,
            "cursor": cursor,
        }
        return await self.get(uri, params)

    async def get_note_all_comments(self, note_id: str, crawl_interval: float = 1.0,
                                    callback: Optional[Callable] = None) -> List[Dict]:
        """
        获取指定笔记下的所有一级评论，该方法会一直查找一个帖子下的所有评论信息
        Args:
            note_id: 笔记ID
            crawl_interval: 爬取一次笔记的延迟单位（秒）
            callback: 一次笔记爬取结束后

        Returns:

        """
        result = []
        comments_has_more = True
        comments_cursor = ""
        while comments_has_more:
            comments_res = await self.get_note_comments(note_id, comments_cursor)
            comments_has_more = comments_res.get("has_more", False)
            comments_cursor = comments_res.get("cursor", "")
            if "comments" not in comments_res:
                utils.logger.info(
                    f"[XHSClient.get_note_all_comments] No 'comments' key found in response: {comments_res}")
                break
            comments = comments_res["comments"]
            if callback:
                await callback(note_id, comments)
            await asyncio.sleep(crawl_interval)
            result.extend(comments)
        return result