tvmao接口分析和实现(Golang)

近期在整理家里的iptv的节目表,iptv提供的epg不完整,更新不及时,准备手动整理一个epg数据,当然,已经有比较知名的免费服务了http://epg.51zmt.top:8000/,之所以还是要自己搞,主要还是因为51zmt的频道信息匹配在我家的xteve里面每次都要收工匹配,爱折腾的人经常变换播放源数据,手动匹配epg数据实在是太痛苦,毕竟我的播放源数据也不少.

xteve

通过Chrome模拟手机页面,打开某个频道的节目表,这里以CCTV1的节目单为例,打开后能看到上午的节目排期表,要通过查看更多来加载剩下的节目单,这里也是本次的关键,涉及到一部分加密的逻辑.

https://m.tvmao.com/api/pg?p=

chrome-01

通过查看页面源码,可以找到发送请求的处理逻辑,这里请求核心的p参数的获取来自于var d = A.d("a", val);,所以重点就是看这部分的实现.
chrome-source-js

var A = {
    _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
    _keyStr2: "KQMFS=DVGO",
    J: function(a) {
        var b = "";
        var c, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
        a = A._C(a);
        while (i < a.length) {
            c = a.charCodeAt(i++);
            chr2 = a.charCodeAt(i++);
            chr3 = a.charCodeAt(i++);
            enc1 = c >> 2;
            enc2 = ((c & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64
            } else if (isNaN(chr3)) {
                enc4 = 64
            }
            b = b + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4)
        }
        return b
    },
    H: function(a) {
        a = a.toString();
        var b = '';
        for (var i = 0; i < a.length; i++) {
            b += this._keyStr2[a.charAt(i)]
        }
        for (var i = 0; i < a.length; i++) {
            b += this._keyStr[a.charAt(i)]
        }
        return b
    },
    _C: function(a) {
        a = a.replace(/\r\n/g, "\n");
        var b = "";
        for (var n = 0; n < a.length; n++) {
            var c = a.charCodeAt(n);
            if (c < 128) {
                b += String.fromCharCode(c)
            } else if ((c > 127) && (c < 2048)) {
                b += String.fromCharCode((c >> 6) | 192);
                b += String.fromCharCode((c & 63) | 128)
            } else {
                b += String.fromCharCode((c >> 12) | 224);
                b += String.fromCharCode(((c >> 6) & 63) | 128);
                b += String.fromCharCode((c & 63) | 128)
            }
        }
        return b
    },
    E: function(a) {
        $(':input[name="ed"]', a).val(A.J('l' + $(".ed", a).val() + 'o'))
    },
    B: function(a) {
        var b = (new Date()).getTime();
        if (a != undefined)
            return A.J(a + '|' + b);
        else
            return A.J('' + b)
    },
    e: function(u) {
        var x = 1;
        var f = $('form').first();
        var a = f.find("input[class='baidu']");
        if (a != undefined) {
            x = 2
        } else if (u != undefined) {
            x = u
        }
        if (f == undefined)
            return x;
        return f.attr('a')
    },
    c: function(e) {
        var v;
        var f = $('form').first();
        if (f == undefined)
            return "";
        var s = f.find("*[type='submit']");
        if (s == undefined) {
            v = f.find("input[class='qq']");
            if (v == undefined)
                return "";
            v = e
        }
        v = s.attr('id');
        return v
    },
    d: function(p, h) {
        var v = A.w(h);
        var a = $("div.fix");
        var x = a || p;
        if (a != undefined) {
            x = h || $("s.fix1")
        }
        x = A.c();
        var b = new Date();
        var c = b.getUTCDate();
        var d = b.getDay();
        var i = d == 0 ? 7 : d;
        i = i * i;
        var F = this._keyStr.charAt(i);
        return F + A.J(x + "|" + A.e(p)) + v
    },
    w: function(v) {
        var t = $("head");
        var a = "|";
        if (t == undefined) {
            tl = "/"
        } else {
            tl = v
        }
        var r = A.J(a + k(tl));
        return r
    },
    s: function(a, b) {
        var c = this._keyStr.charAt(37);
        return A.J(c + a)
    }
};
var k = function(a) {
    var f = $('form').first();
    if (f == undefined)
        return "";
    var b = f.attr('id');
    if (b == undefined)
        f.attr('id', a);
    return f.attr('q')
};
$(function() {
    var b = $('<input type="hidden" name="ek"/>');
    b.val(A.B());
    $('form[name="frmlogin"]').append(b);
    $('a[class^="by"]').each(function() {
        var a = $(this).attr("href") + "&ek=" + encodeURIComponent(A.B());
        $(this).attr("href", a)
    })
});