爬蟲呼叫百度翻譯API

Dictator丶發表於2019-01-14
爬蟲API

1. 分析

1.1 尋找點選翻譯時傳送的請求

按照圖示操作，發現在輸入文字點選翻譯之後，一共傳送了四個請求。

爬蟲呼叫百度翻譯API

分別點開三個檢視返回響應，可以發現有用的為第一個langdetect和第四個v2transapi

  • langdetect

    第一個響應請求資訊

    請求方式為post, 引數為

    query: 你好
複製程式碼

    請求響應為：

    {"error":0,"msg":"success","lan":"zh"}
複製程式碼

    返回值 lan 為 zh，由此推斷改請求是返回需要翻譯的語言的型別。

  • v2transapi

    第四個響應請求資訊

    請求方式為 post，引數為

    from: zh
to: en
query: 你好
transtype: realtime
simple_means_flag: 3
sign: 232427.485594
token: f62805d95edecfe9fbd537179f6a147d
複製程式碼

    請求的響應為：

    {"trans_result":{"from":"zh","to":"en","domain":"all","type":2,"status":0,"data":[{"dst":"Hello","prefixWrap":0,"src":"\u4f60\u597d","relation":[],"result":[[0,"Hello",["0|6"],[],["0|6"],["0|5"]]]}]},"dict_result":{"edict":"","zdict":{"simple":{"chenyu":null,"means":[{"pinyin":"n\u01d0 h\u01ceo","exp":[{"des":[{"main":"[how do you do;how are you;hello] \u7528\u4e8e\u6709\u793c\u8c8c\u7684\u6253\u62db\u547c\u6216\u8868\u793a\u4e0e\u4eba\u89c1\u9762\u65f6\u7684\u95ee\u5019","sub":[]}],"pos":""}]}]},"word":"\u4f60\u597d","detail":null},"from":"kingsoft","simple_means":{"word_name":"\u4f60\u597d","from":"kingsoft","word_means":["hello","hi","How do you do!"],"items":[""],"symbols":[{"word_symbol":"n\u01d0 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複製程式碼

    由此推斷出該請求是真正進行翻譯的請求。

1.2 分析傳送翻譯請求的引數

  • 請求的引數資訊

    • from：需要翻譯的語言型別
    • to： 需要翻譯成哪種語言
    • query：需要翻譯的內容
    • transtype：不清楚，但是這個值一直不變
    • simple_means_flag： 不清楚，但是這個值一直不變
    • sign：經過加密處理後的結果，不同的內容不一樣
    • token：也沒有發生變化

  • 需要處理的引數

    • sign 引數需要我們去分析是怎麼生成的，在開發者模式下搜尋 sign 發現結果過多，所以搜尋 simple_means_flag 來找到 sign。

      search

    • 通過圖示操作找到對應的檔案，如圖所示，發現格式很亂，點選左下角 {} 來格式化程式碼。

      format

    • 格式完程式碼完後發現 sign 引數是通過呼叫 m() 函式並傳入需要翻譯的內容處理生成的。 token 是通過 window.common.token獲取的，在 console 下執行該語句，就能得到值。那麼在 html 頁面中搜尋 token，就能獲取該值。可以通過正則在匹配到。

      js

    console

    • 尋找 m() 函式。在格式完後的js中直接搜尋 m 會有很多匹配結果，找起來很費勁，猜測應該是將一個函式命名為 m。發現傳送翻譯請求的函式在如下所示的大函式中。

      define("translation:widget/translate/input/translate", function(t, a) {
"use strict";
var e = t("translation:widget/translate/input/prompt")
  , n = t("translation:widget/translate/input/textarea")
  , r = t("translation:widget/common/util")
  , s = t("translation:widget/translate/output/output")
  , o = t("translation:widget/common/config/trans")
  , i = t("translation:widget/translate/input/processlang")
  , l = t("translation:widget/common/string")
  , u = t("translation:widget/translate/input/soundicon")
  , g = t("translation:widget/translate/input/hash")
  , c = t("translation:widget/common/environment")
  , d = t("translation:widget/translate/input/longtext")
  , p = t("translation:widget/common/sendLog")
  , y = t("translation:widget/translate/details/dictionary/simplemeans")
  , f = t("translation:widget/translate/history/history")
  , m = t("translation:widget/translate/input/pGrab")
  , h = t("translation:widget/translate/details/adLink/adLink")
  , w = {
    onTrans: function(t) {
        y.translateStopRepeat() || y.shutdownAudio();
        var a = (n.getElem(),
        n.getVal())
          , e = this
          , s = t && t.transtype;
        if (r.isUrl(a))
            return void this.translateWebPage(a);
        if (a.length > 0 && p.sendIndexDisplayLog({
            action: "query"
        }),
        this.isQueryValid(a)) {
            var o = a;
            o.length > 50 && (o = l.cutByByte(o, 0, 50).replace(/[\uD800-\uDBFF]$/, ""));
            var i = {
                query: o
            };
            $.ajax({
                url: "/langdetect",
                type: "POST",
                data: i,
                success: function(t) {
                    0 === t.error && t.lan ? e.langIsDeteced(t.lan, a, s) : e.reponseQuery(a)
                }
            })
        }
    },
    isQueryValid: function(t) {
        return t ? !0 : !1
    },
    processQuery: function(t) {
        var a = t;
        if (l.getByte(t) > o.MAX_QUERY_COUNT) {
            c.set("needLongtextTip", !0);
            var e = t;
            a = l.cutByByte(t, 0, o.MAX_QUERY_COUNT).replace(/[\uD800-\uDBFF]$/, ""),
            e = l.cutByByte(e, o.MAX_QUERY_COUNT, o.MAX_QUERY_COUNT + 9),
            d.showTip({
                query: e
            })
        }
        return a
    },
    langIsDeteced: function(t, a, n, r) {
        if (null !== t) {
            var s = $(".select-from-language .language-selected").attr("data-lang")
              , o = $(".select-to-language .language-selected").attr("data-lang")
              , l = !1;
            c.get("langChangedByUser") && t === o && (l = !0);
            var g = null;
            r && !c.get("fromLangIsAuto") && s !== t ? g = i.processOcrLang(t, s, o) : (e.show(t, s),
            g = i.getLang(t, s, o)),
            u.show();
            var d = this
              , a = this.processQuery(a)
              , p = {
                from: g.fromLang,
                to: g.toLang,
                query: a,
                transtype: n,
                simple_means_flag: 3,
                sign: m(a),
                token: window.common.token
            };
            this.translateXHR && 4 !== this.translateXHR.readyState && this.translateXHR.abort(),
            this.translateXHR = $.ajax({
                type: "POST",
                url: "/v2transapi",
                cache: !1,
                data: p
            }).done(function(t) {
                c.set("isInRtTransState", !0),
                d.translateSuccess(t, g.fromLang, g.toLang, a, l)
            })
        }
    },
    translateWebPage: function(t) {
        var a = "/";
        "https:" === location.protocol && (a = "http://fanyi.baidu.com/"),
        document.location.href = [a + "transpage?", "query=" + encodeURIComponent(t), "&source=url", "&ie=utf8", "&from=" + $(".select-from-language .language-selected").attr("data-lang"), "&to=" + $(".select-to-language .language-selected").attr("data-lang"), "&render=1"].join("")
    },
    textareaFocus: function() {
        n.focus()
    },
    translateSuccess: function(t, a, e, r, i) {
        return n.getVal() ? (r && encodeURIComponent(r).length < o.MAX_URL_COUNT && f.add(a, e, $.trim(r)),
        f.hideHistory(),
        h.hide(),
        s.checkResponse({
            res: t,
            from: a,
            to: e,
            query: r,
            badCaseByForce: i
        }),
        void g.setHash({
            query: r
        })) : void c.set("isInRtTransState", !1)
    },
    reponseQuery: function() {}
};
a.onTranslate = function(t) {
    w.onTrans(t)
}
,
a.translateAfterOcr = function(t, a) {
    _hmt.push(["_trackEvent", "首頁", "59_首頁頁面_翻譯query量_圖片"]),
    w.langIsDeteced(t, a, void 0, !0)
}
});
複製程式碼

      m

      這個大函式中有個 m 函式，搜尋 m 對應的 translation:widget/translate/input/pGrab， 發現此段程式碼中有一行為

      return p = n(p, D),p ^= s,0 > p && (p = (2147483647 & p) + 2147483648),p %= 1e6,p.toString() + "." + (p ^ m)
複製程式碼

      其中p.toString() + "." + (p ^ m) 正好與 sign 的格式相符，所以推測通過這個函式來生成sign，我們在python中呼叫 execjs 執行這個函式就能得到 sign 值。

    • m 函式的程式碼

      define("translation:widget/translate/input/pGrab", function(r, o, t) {
"use strict";
function a(r) {
    if (Array.isArray(r)) {
        for (var o = 0, t = Array(r.length); o < r.length; o++)
            t[o] = r[o];
        return t
    }
    return Array.from(r)
}
function n(r, o) {
    for (var t = 0; t < o.length - 2; t += 3) {
        var a = o.charAt(t + 2);
        a = a >= "a" ? a.charCodeAt(0) - 87 : Number(a),
        a = "+" === o.charAt(t + 1) ? r >>> a : r << a,
        r = "+" === o.charAt(t) ? r + a & 4294967295 : r ^ a
    }
    return r
}
function e(r) {
    var o = r.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g);
    if (null === o) {
        var t = r.length;
        t > 30 && (r = "" + r.substr(0, 10) + r.substr(Math.floor(t / 2) - 5, 10) + r.substr(-10, 10))
    } else {
        for (var e = r.split(/[\uD800-\uDBFF][\uDC00-\uDFFF]/), C = 0, h = e.length, f = []; h > C; C++)
            "" !== e[C] && f.push.apply(f, a(e[C].split(""))),
            C !== h - 1 && f.push(o[C]);
        var g = f.length;
        g > 30 && (r = f.slice(0, 10).join("") + f.slice(Math.floor(g / 2) - 5, Math.floor(g / 2) + 5).join("") + f.slice(-10).join(""))
    }
    var u = void 0
      , l = "" + String.fromCharCode(103) + String.fromCharCode(116) + String.fromCharCode(107);
    u = null !== i ? i : (i = window[l] || "") || "";
    for (var d = u.split("."), m = Number(d[0]) || 0, s = Number(d[1]) || 0, S = [], c = 0, v = 0; v < r.length; v++) {
        var A = r.charCodeAt(v);
        128 > A ? S[c++] = A : (2048 > A ? S[c++] = A >> 6 | 192 : (55296 === (64512 & A) && v + 1 < r.length && 56320 === (64512 & r.charCodeAt(v + 1)) ? (A = 65536 + ((1023 & A) << 10) + (1023 & r.charCodeAt(++v)),
        S[c++] = A >> 18 | 240,
        S[c++] = A >> 12 & 63 | 128) : S[c++] = A >> 12 | 224,
        S[c++] = A >> 6 & 63 | 128),
        S[c++] = 63 & A | 128)
    }
    for (var p = m, F = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(97) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(54)), D = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(51) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(98)) + ("" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(102)), b = 0; b < S.length; b++)
        p += S[b],
        p = n(p, F);
    return p = n(p, D),
    p ^= s,
    0 > p && (p = (2147483647 & p) + 2147483648),
    p %= 1e6,
    p.toString() + "." + (p ^ m)
}
 var i = null;
 t.exports = e
})
複製程式碼

      函式中有兩行程式碼為：

      l = "" + String.fromCharCode(103) + String.fromCharCode(116) + String.fromCharCode(107);
u = null !== i ? i : (i = window[l] || "") || "";
複製程式碼

      在 console 下執行第一行得到 l 為 gtk，再執行 window["gtk"], 得到 gtk 的值，在 html 中也能搜到。需要用到這個值，所以像token一樣用正則匹配即可獲得

    • 修改js函式

      經過除錯修改，js修改為

      var i = null
function a(r) {
    if (Array.isArray(r)) {
        for (var o = 0, t = Array(r.length); o < r.length; o++)
            t[o] = r[o];
        return t
    }
    return Array.from(r)
}
function n(r, o) {
    for (var t = 0; t < o.length - 2; t += 3) {
        var a = o.charAt(t + 2);
        a = a >= "a" ? a.charCodeAt(0) - 87 : Number(a),
        a = "+" === o.charAt(t + 1) ? r >>> a : r << a,
        r = "+" === o.charAt(t) ? r + a & 4294967295 : r ^ a
    }
    return r
}
function e(r, gtk) {
    var t = r.length;
    t > 30 && (r = "" + r.substr(0, 10) + r.substr(Math.floor(t / 2) - 5, 10) + r.substr(-10, 10));
    var u = void 0,
    u = null !== i ? i : (i = gtk || "") || "";
    for (var d = u.split("."), m = Number(d[0]) || 0, s = Number(d[1]) || 0, S = [], c = 0, v = 0; v < r.length; v++) {
        var A = r.charCodeAt(v);
        128 > A ? S[c++] = A : (2048 > A ? S[c++] = A >> 6 | 192 : (55296 === (64512 & A) && v + 1 < r.length && 56320 === (64512 & r.charCodeAt(v + 1)) ? (A = 65536 + ((1023 & A) << 10) + (1023 & r.charCodeAt(++v)),
        S[c++] = A >> 18 | 240,
        S[c++] = A >> 12 & 63 | 128) : S[c++] = A >> 12 | 224,
        S[c++] = A >> 6 & 63 | 128),
        S[c++] = 63 & A | 128)
    }
    for (var p = m, F = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(97) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(54)), D = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(51) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(98)) + ("" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(102)), b = 0; b < S.length; b++)
        p += S[b],
        p = n(p, F);
    return p = n(p, D),
    p ^= s,
    0 > p && (p = (2147483647 & p) + 2147483648),
    p %= 1e6,
    p.toString() + "." + (p ^ m)
}
複製程式碼

2. 程式碼示例

import requests
import json
import re
import execjs
import sys

class BaiduTranslation(object):
    def __init__(self, content):
        self.headers = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36',
            'Cookie': 'BIDUPSID=E9B058D087F0C0FDD3A0C88A93681FCE; PSTM=1536569393; BDUSS=zFYV1NpRVRmSDhEVWg2Y3pjS2t5RFdXWGFoa0NIeFROdnozdWRkWU1MZHB2T3RiQVFBQUFBJCQAAAAAAAAAAAEAAADnj6yvtdK~y83GtuA5NQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGkvxFtpL8RbM; MCITY=-%3A; BAIDUID=0A5182736E61ACA3D7442FC0DDE62F01:FG=1; BDSFRCVID=bV4sJeCCxG3J_p59aEDMQwqW21UdQvfiKQYI3J; H_BDCLCKID_SF=JRA8oK05JIvhDRTvhCcjh-FSMgTBKI62aKDsKp7g-hcqEIL4LPRbQR0pjnOJBnOfQmTH2DQma4OkHUbSj4Qoj-6QbfvLBTolLeJMXJRttq5nhMJm257JDMP0qJ7jttTy523ibR6vQpnNqxtuj6tWj6j0DNR22Pc22-oKWnTXbRu_Hn7zeUjoDbtpbtbmhU-eyJni_C3m5tnnHlQPQJosbR8h5qLDLROg0R7ZVDD5fCtbMDLr-Pvo5t3H5MoX5-QXbPo2WbC35tooDtOv5J5jbjus5p62-KCHtbP8_KL8tD8MbD0Cq6K5j5cWjG4OexneWDTm5-nTtK3VjP_63-jS3pby0M5O2-rLJaKtbM8baU85OCFlD5thD63BeaRKeJQX2COXsJ6VHJOoDDkRjMR5y4LdLp7xJhT00bFf0bRmL-TdO56CbMFMjl4JyM7EtMCeWJLe_KDaJItWbP5kMtn_qttjMfbWetTbHD7yWCv5Wt55OR5JLn7nDpIX0a-fK-7wK66L0lo_2hO1MljhW55SMfJyyGCHt6tjtnAj_Iv55RTWjJuk-4r_bnIJMqJ-2tvtK4o2WbCQJhu28pcNLTDKjbIHLfcaqlkLBK5f-l5-Bt0B8prhjpO1j4_eKG8OttQL3b63blrSt-5J8h5jDh3qb6ksD-RC5JTwJjvy0hvcLR6cShnq5fjrDRLbXU6BK5vPbNcZ0l8K3l02VKO_e6t5jjJLDGtsKbQKaDQ036rh-6rjDnCr2MnOXUI8LNDH2x4HXKTBVlv8LKJbSq54X6rCbbk80RO7ttoAKa535hTR3UjAEf5lqf7nDUL1Db3DW6vMtg3tsRngfInoepvo0tcc3MkF5tjdJJQOBKQB0KnGbUQkeq8CQft205tpeGLfq6tOfnksL6rJbPoEq5rnhPF3-l53KP6-3MJO3b7ZM-tafRjpsh6h5nQRD6_AbbQqKtciLG5AohFLK-oj-D_mD5AB3J; BDORZ=B490B5EBF6F3CD402E515D22BCDA1598; H_PS_PSSID=28312_1456_21125_28132_28266_22160; delPer=0; PSINO=2; BDRCVFR[feWj1Vr5u3D]=I67x6TjHwwYf0; locale=zh; from_lang_often=%5B%7B%22value%22%3A%22en%22%2C%22text%22%3A%22%u82F1%u8BED%22%7D%2C%7B%22value%22%3A%22zh%22%2C%22text%22%3A%22%u4E2D%u6587%22%7D%5D; REALTIME_TRANS_SWITCH=1; FANYI_WORD_SWITCH=1; HISTORY_SWITCH=1; SOUND_SPD_SWITCH=1; SOUND_PREFER_SWITCH=1; Hm_lvt_64ecd82404c51e03dc91cb9e8c025574=1547433565; Hm_lpvt_64ecd82404c51e03dc91cb9e8c025574=1547433565; to_lang_often=%5B%7B%22value%22%3A%22zh%22%2C%22text%22%3A%22%u4E2D%u6587%22%7D%2C%7B%22value%22%3A%22en%22%2C%22text%22%3A%22%u82F1%u8BED%22%7D%5D',
            'Host': 'fanyi.baidu.com',
            'Origin': 'https: // fanyi.baidu.com',
            'Referer': 'https: // fanyi.baidu.com /?aldtype = 16047'
        }
        self.detect_url = 'https://fanyi.baidu.com/langdetect'
        self.trans_url = 'https://fanyi.baidu.com/v2transapi'
        self.ori_url = 'https://fanyi.baidu.com/'
        self.content = content
        self.session = requests.Session()
        self.token = ''
        self.gtk = ''

    def get_token_gtk(self):
        response = self.session.get(self.ori_url, headers=self.headers)
        html = response.content.decode()
        token_matches = re.findall("token: '(.*?)'", html, re.S)
        for match in token_matches:
            self.token = match
        gtk_matches = re.findall("window.gtk = '(.*?)';", html, re.S)
        for match in gtk_matches:
            self.gtk = match
        # print(self.token, self.gtk)

    def get_lan_type(self):
        lan_params = {
            'query': self.content
        }
        response = self.session.post(self.detect_url, headers=self.headers, data=lan_params)
        data = json.loads(response.content.decode())
        return data['lan']

    def get_sign(self):
        js = """
            var i = null
            function a(r) {
                if (Array.isArray(r)) {
                    for (var o = 0, t = Array(r.length); o < r.length; o++)
                        t[o] = r[o];
                    return t
                }
                return Array.from(r)
            }
            function n(r, o) {
                for (var t = 0; t < o.length - 2; t += 3) {
                    var a = o.charAt(t + 2);
                    a = a >= "a" ? a.charCodeAt(0) - 87 : Number(a),
                    a = "+" === o.charAt(t + 1) ? r >>> a : r << a,
                    r = "+" === o.charAt(t) ? r + a & 4294967295 : r ^ a
                }
                return r
            }
            function e(r, gtk) {
                var t = r.length;
                t > 30 && (r = "" + r.substr(0, 10) + r.substr(Math.floor(t / 2) - 5, 10) + r.substr(-10, 10));
                var u = void 0,
                u = null !== i ? i : (i = gtk || "") || "";
                for (var d = u.split("."), m = Number(d[0]) || 0, s = Number(d[1]) || 0, S = [], c = 0, v = 0; v < r.length; v++) {
                    var A = r.charCodeAt(v);
                    128 > A ? S[c++] = A : (2048 > A ? S[c++] = A >> 6 | 192 : (55296 === (64512 & A) && v + 1 < r.length && 56320 === (64512 & r.charCodeAt(v + 1)) ? (A = 65536 + ((1023 & A) << 10) + (1023 & r.charCodeAt(++v)),
                    S[c++] = A >> 18 | 240,
                    S[c++] = A >> 12 & 63 | 128) : S[c++] = A >> 12 | 224,
                    S[c++] = A >> 6 & 63 | 128),
                    S[c++] = 63 & A | 128)
                }
                for (var p = m, F = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(97) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(54)), D = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(51) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(98)) + ("" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(102)), b = 0; b < S.length; b++)
                    p += S[b],
                    p = n(p, F);
                return p = n(p, D),
                p ^= s,
                0 > p && (p = (2147483647 & p) + 2147483648),
                p %= 1e6,
                p.toString() + "." + (p ^ m)
            }
        """
        sign = execjs.compile(js).call('e', self.content, self.gtk)
        return sign

    def get_trans(self):
        # 1. 獲取 token 和 gtk
        self.get_token_gtk()
        # 2. 獲取 sign
        sign = self.get_sign()
        # 3. 獲取語言型別
        lan_type = self.get_lan_type()
        if lan_type == 'zh':
            from_lan = 'zh'
            to_lan = 'en'
        else:
            from_lan = 'en'
            to_lan = 'zh'
        # 傳送翻譯請求
        params = {
            'from': from_lan,
            'to': to_lan,
            'query': self.content,
            'transtype': 'realtime',
            'simple_means_flag': 3,
            'sign': sign,
            'token': self.token
        }
        response = self.session.post(self.trans_url, headers=self.headers, data=params)
        # print(response.request.headers)
        # print(response.content.decode())
        data = json.loads(response.content.decode())
        result = data['trans_result']['data'][0]['dst']
        print('翻譯結果： ' + result)
        
if __name__ == '__main__':
    trans_str = sys.argv[1]
    trans = BaiduTranslation(trans_str)
    trans.get_trans()
複製程式碼

在 cmd 下執行結果：

結果

github連結: github.com/einherjarCa…

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