葉湘?zhèn)?#xff1a;【文字篇】如何系統(tǒng)地自學(xué) Python？?zhuanlan.zhihu.com
直接介紹一下具體的步驟以及注意點：
instagram 爬蟲注意點
- instagram 的首頁數(shù)據(jù)是 服務(wù)端渲染的，所以首頁出現(xiàn)的 11 或 12 條數(shù)據(jù)是以 html 中的一個 json 結(jié)構(gòu)存在的（additionalData）, 之后的帖子加載才是走 ajax 請求的
- 在 2019/06 之前，ins 是有反爬機(jī)制的，請求時需要在請求頭加了 'X-Instagram-GIS' 字段。其算法是：
1、將 rhx_gis 和 queryVariables 進(jìn)行組合
rhx_gis 可以在首頁處的 sharedData 這個 json 結(jié)構(gòu)中獲得
2、然后進(jìn)行 md5 哈希
e.g.
queryVariables = '{"id":"' + user_id + '","first":12,"after":"' +cursor+ '"}'print(queryVariables)headers['X-Instagram-GIS'] = hashStr(GIS_rhx_gis + ":" + queryVariables)
- 但是在在 2019/06 之后， instagram 已經(jīng)取消了 X-Instagram-GIS 的校驗，所以無需再生成 X-Instagram-GIS，上一點內(nèi)容可以當(dāng)做歷史來了解了
- 初始訪問 ins 首頁的時候會設(shè)置一些 cookie，設(shè)置的內(nèi)容 (response header) 如下：
set-cookie: rur=PRN; Domain=.instagram.com; HttpOnly; Path=/; Secureset-cookie: ds_user_id=11859524403; Domain=.instagram.com; expires=Mon, 15-Jul-2019 09:22:48 GMT; Max-Age=7776000; Path=/; Secureset-cookie: urlgen="{"45.63.123.251": 20473}:1hGKIi:7bh3mEau4gMVhrzWRTvtjs9hJ2Q"; Domain=.instagram.com; HttpOnly; Path=/; Secureset-cookie: csrftoken=Or4nQ1T3xidf6CYyTE7vueF46B73JmAd; Domain=.instagram.com; expires=Tue, 14-Apr-2020 09:22:48 GMT; Max-Age=31449600; Path=/; Secure
- 關(guān)于 query_hash，一般這個哈希值不用怎么管，可以直接寫死
- 特別注意：在每次請求時務(wù)必帶上自定義的 header，且 header 里面要有 user-agent，這樣子才能使用 rhx_gis 來進(jìn)行簽名訪問并且獲取到數(shù)據(jù)。切記！是每次訪問！例如：
headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'
}
大部分 api 的訪問需要在請求頭的 cookie 中攜帶 session-id 才能得到數(shù)據(jù)，一個正常的請求頭 (request header) 如下:
:authority: www.instagram.com:method: GET:path: /graphql/query/?query_hash=ae21d996d1918b725a934c0ed7f59a74&variables=%7B%22fetch_media_count%22%3A0%2C%22fetch_suggested_count%22%3A30%2C%22ignore_cache%22%3Atrue%2C%22filter_followed_friends%22%3Atrue%2C%22seen_ids%22%3A%5B%5D%2C%22include_reel%22%3Atrue%7D:scheme: httpsaccept: */*accept-encoding: gzip, deflate, braccept-language: zh-CN,zh;q=0.9,en;q=0.8,la;q=0.7cache-control: no-cachecookie: mid=XI-joQAEAAHpP4H2WkiI0kcY3sxg; csrftoken=Or4nQ1T3xidf6CYyTE7vueF46B73JmAd; ds_user_id=11859524403; sessionid=11859524403%3Al965tcIRCjXmVp%3A25; rur=PRN; urlgen="{"45.63.123.251": 20473}:1hGKIj:JvyKtYz_nHgBsLZnKrbSq0FEfeg"pragma: no-cachereferer: https://www.instagram.com/user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36x-ig-app-id: 936619743392459x-instagram-gis: 8f382d24b07524ad90b4f5ed5d6fccdbx-requested-with: XMLHttpRequest
- 注意 user-agent、x-ig-app-id (html 中的 sharedData 中獲取)、x-instagram-gis，以及 cookie 中的 session-id 配置
api 的分頁 (請求下一頁數(shù)據(jù))，如用戶帖子列表
ins 中一個帶分頁的 ajax 請求，一般請求參數(shù)會類似下面：# 網(wǎng)頁頁面信息page_info = js_data["entry_data"]["ProfilePage"][0]["graphql"]["user"]["edge_owner_to_timeline_media"]['page_info']# 下一頁的索引值A(chǔ)QCSnXw1JsoV6LPOD2Of6qQUY7HWyXRc_CBSMWB6WvKlseC-7ibKho3Em0PEG7_EP8vwoXw5zwzsAv_mNMR8yX2uGFZ5j6YXdyoFfdbHc6942wcursor = page_info['end_cursor']# 是否有下一頁flag = page_info['has_next_page']
- end_cursor 即為 after 的值，has_next_page 檢測是否有下一頁
如果是有下一頁，可進(jìn)行第一次分頁數(shù)據(jù)請求，第一次分頁請求的響應(yīng)數(shù)據(jù)回來之后，id，first 的值不用變，after 的值變?yōu)轫憫?yīng)數(shù)據(jù)中 page_info 中 end_cursor 的值，再構(gòu)造 variables，連同 query_hash 發(fā)起再下一頁的請求
再判斷響應(yīng)數(shù)據(jù)中的 page_info 中 has_next_page 的值，循環(huán)下去，可拿完全部數(shù)據(jù)。若不想拿完，可利用響應(yīng)數(shù)據(jù)中的 edge_owner_to_timeline_media 中的 count 值來做判斷，該值表示用戶總共有多少媒體 - 視頻帖子和圖片帖子數(shù)據(jù)結(jié)構(gòu)不一樣，注意判斷響應(yīng)數(shù)據(jù)中的 is_video 字段
- 如果是用一個 ins 賬號去采集的話，只要請求頭的 cookie 中帶上合法且未過期的 session_id，可直接訪問接口，無需計算簽名。
最直接的做法是：打開瀏覽器，登錄 instagram 后，F12 查看 xhr 請求，將 request header 中的 cookie 復(fù)制過來使用即可，向下面：
# -*- coding:utf-8 -*-
import requests
import re
import json
import urllib.parse
import hashlib
import sysUSER_AGENT = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'BASE_URL = 'https://www.instagram.com'
ACCOUNT_MEDIAS = "http://www.instagram.com/graphql/query/?query_hash=42323d64886122307be10013ad2dcc44&variables=%s"
ACCOUNT_PAGE = 'https://www.instagram.com/%s'proxies = {'http': 'http://127.0.0.1:1087','https': 'http://127.0.0.1:1087',
}# 一次設(shè)置proxy的辦法，將它設(shè)置在一次session會話中，這樣就不用每次都在調(diào)用requests的時候指定proxies參數(shù)了
# s = requests.session()
# s.proxies = {'http': '121.193.143.249:80'}def get_shared_data(html=''):"""get window._sharedData from page,return the dict loaded by window._sharedData str"""if html:target_text = htmlelse:header = generate_header()response = requests.get(BASE_URL, proxies=proxies, headers=header)target_text = response.textregx = r"s*.*s*<script.*?>.*_sharedDatas*=s*(.*?);</script>"match_result = re.match(regx, target_text, re.S)data = json.loads(match_result.group(1))return data# def get_rhx_gis():
# """get the rhx_gis value from sharedData
# """
# share_data = get_shared_data()
# return share_data['rhx_gis']def get_account(user_name):"""get the account info by username:param user_name::return:"""url = get_account_link(user_name)header = generate_header()response = requests.get(url, headers=header, proxies=proxies)data = get_shared_data(response.text)account = resolve_account_data(data)return accountdef get_media_by_user_id(user_id, count=50, max_id=''):"""get media info by user id:param id::param count::param max_id::return:"""index = 0medias = []has_next_page = Truewhile index <= count and has_next_page:varibles = json.dumps({'id': str(user_id),'first': count,'after': str(max_id)}, separators=(',', ':')) # 不指定separators的話key:value的:后會默認(rèn)有空格，因為其默認(rèn)separators為(', ', ': ')url = get_account_media_link(varibles)header = generate_header()response = requests.get(url, headers=header, proxies=proxies)media_json_data = json.loads(response.text)media_raw_data = media_json_data['data']['user']['edge_owner_to_timeline_media']['edges']if not media_raw_data:return mediasfor item in media_raw_data:if index == count:return mediasindex += 1medias.append(general_resolve_media(item['node']))max_id = media_json_data['data']['user']['edge_owner_to_timeline_media']['page_info']['end_cursor']has_next_page = media_json_data['data']['user']['edge_owner_to_timeline_media']['page_info']['has_next_page']return mediasdef get_media_by_url(media_url):response = requests.get(get_media_url(media_url), proxies=proxies, headers=generate_header())media_json = json.loads(response.text)return general_resolve_media(media_json['graphql']['shortcode_media'])def get_account_media_link(varibles):return ACCOUNT_MEDIAS % urllib.parse.quote(varibles)def get_account_link(user_name):return ACCOUNT_PAGE % user_namedef get_media_url(media_url):return media_url.rstrip('/') + '/?__a=1'# def generate_instagram_gis(varibles):
# rhx_gis = get_rhx_gis()
# gis_token = rhx_gis + ':' + varibles
# x_instagram_token = hashlib.md5(gis_token.encode('utf-8')).hexdigest()
# return x_instagram_tokendef generate_header(gis_token=''):# todo: if have session, add the session key:value to headerheader = {'user-agent': USER_AGENT,}if gis_token:header['x-instagram-gis'] = gis_tokenreturn headerdef general_resolve_media(media):res = {'id': media['id'],'type': media['__typename'][5:].lower(),'content': media['edge_media_to_caption']['edges'][0]['node']['text'],'title': 'title' in media and media['title'] or '','shortcode': media['shortcode'],'preview_url': BASE_URL + '/p/' + media['shortcode'],'comments_count': media['edge_media_to_comment']['count'],'likes_count': media['edge_media_preview_like']['count'],'dimensions': 'dimensions' in media and media['dimensions'] or {},'display_url': media['display_url'],'owner_id': media['owner']['id'],'thumbnail_src': 'thumbnail_src' in media and media['thumbnail_src'] or '','is_video': media['is_video'],'video_url': 'video_url' in media and media['video_url'] or ''}return resdef resolve_account_data(account_data):account = {'country': account_data['country_code'],'language': account_data['language_code'],'biography': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['biography'],'followers_count': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['edge_followed_by']['count'],'follow_count': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['edge_follow']['count'],'full_name': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['full_name'],'id': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['id'],'is_private': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['is_private'],'is_verified': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['is_verified'],'profile_pic_url': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['profile_pic_url_hd'],'username': account_data['entry_data']['ProfilePage'][0]['graphql']['user']['username'],}return accountaccount = get_account('shaq')result = get_media_by_user_id(account['id'], 56)media = get_media_by_url('https://www.instagram.com/p/Bw3-Q2XhDMf/')print(len(result))
print(result)
封裝成庫了！
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