有个网友百度到了我的文章《python模拟登陆登陆二:获取和处理发送post request和head数据》,其中就遇到post的部分参数动态改变的问题,因为部分参数是javascript运行得到的结果。
网友的邮件如下:
function chkpwd(obj) { if(obj.value!='') { var s=md5(document.all.txt_asmcdefsddsd.value+md5(obj.value).substring(0,30).toUpperCase()+'10639').substring(0,30).toUpperCase(); document.all.dsdsdsdsdxcxdfgfg.value=s;} else { document.all.dsdsdsdsdxcxdfgfg.value=obj.value;} } function chkyzm(obj) { if(obj.value!='') { var s=md5(md5(obj.value.toUpperCase()).substring(0,30).toUpperCase()+'10639').substring(0,30).toUpperCase(); document.all.fgfggfdgtyuuyyuuckjg.value=s;} else { document.all.fgfggfdgtyuuyyuuckjg.value=obj.value.toUpperCase();}}
首先要跟你说下抱歉,今天晚上才看到你的邮件。因为我博客上留下的是163邮箱,但是不知道为什么,你发的邮件并没有转发到我的主邮箱。我今天有事偶然登录网易账户才看到你的邮件。不知道你现在是否已经解决了你的问题,这里我说下我的解决思路吧。解决思路:你的教学网站将你输入的分别用chkpwd(obj) 来加密得到参数 dsdsdsdsdxcxdfgfg 和 chkyzm(obj)来加密得到参数fgfggfdgtyuuyyuuckjg。而这两个加密函数都调用了md5.js这个js文件参与加密。我们无须管md5.js的加密过程,只需要调用它得到结果就行了。
function chkpwd(obj) { if(obj.value!='') { var s=md5(document.all.txt_asmcdefsddsd.value+md5(obj.value).substring(0,30).toUpperCase()+'10639').substring(0,30).toUpperCase(); document.all.dsdsdsdsdxcxdfgfg.value=s;} else { document.all.dsdsdsdsdxcxdfgfg.value=obj.value;} }
解释:
document.all.txt_asmcdefsddsd.value 这个参数的值就是学号
obj.value 其实就是你的登录密码
function chkyzm(obj) { if(obj.value!='') { var s=md5(md5(obj.value.toUpperCase()).substring(0,30).toUpperCase()+'10639').substring(0,30).toUpperCase(); document.all.fgfggfdgtyuuyyuuckjg.value=s;} else { document.all.fgfggfdgtyuuyyuuckjg.value=obj.value.toUpperCase();}}
解释:
obj.value 就是验证码的值
由此可以,第一个post需要的参数dsdsdsdsdxcxdfgfg的值肯定是固定的,因为帐号和密码是不变的。
而 第二个post需要的参数fgfggfdgtyuuyyuuckjg的值是随着验证码改变而时刻变化的。所以,我建议采取的方案是我们直接调用这两个加密 的函数,而无需管它加密的过程,我们只要结果就行,我们唯一需要做的就是将帐号,密码,验证码作为参数传递给这两个加密函数就可以了。
那么,现在的问题就是如何在python中调用这js代码了,有两种方法。
第一种就是直接在python中调用js代码,涉及到python与javascript的交互,需要用到一些模块。所以加密函数的代码要稍微改改。
第二种方法,用python实现这两个加密函数。这两个加密函数很容易用python实现,其中的md5.js作用就是使用md5加密字符串,python很容易实现,其余的就是转换大小写,截取字符长度等,一样容易实现。
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分析完毕,上面的思路希望对你有用。如果你已经解决,可以分享下你的思路。
附上我验证两个加密函数作用的测试文件:,直接解压运行index.html就可以了。
<html> <head> <script type="text/javascript" src="md5.js"></script> <script type="text/javascript"> //这里我假设帐号是1109030201 //登录密码是123456 function chkpwd() { var s=md5('1109030201'+md5('123456').substring(0,30).toUpperCase()+'10639').substring(0,30).toUpperCase(); window.alert(s); } chkpwd(); </script </head> <body></body> </html>
function chkpwd(obj) { if(obj.value!='') { var s=md5(document.all.txt_asmcdefsddsd.value+md5(obj.value).substring(0,30).toUpperCase()+'10639').substring(0,30).toUpperCase(); document.all.dsdsdsdsdxcxdfgfg.value=s;} else { document.all.dsdsdsdsdxcxdfgfg.value=obj.value;} } function chkyzm(obj) { if(obj.value!='') { var s=md5(md5(obj.value.toUpperCase()).substring(0,30).toUpperCase()+'10639').substring(0,30).toUpperCase(); document.all.fgfggfdgtyuuyyuuckjg.value=s;} else { document.all.fgfggfdgtyuuyyuuckjg.value=obj.value.toUpperCase();}}
md5.js:
function md5js(pass, code, uin) { var I = hexchar2bin(md5(pass)); var H = md5(I + uin); var G = md5(H + code.toUpperCase()); return G } var hexcase = 1; var b64pad = ""; var chrsz = 8; var mode = 32; function md5(A) { return hex_md5(A) } function hex_md5(A) { return binl2hex(core_md5(str2binl(A), A.length * chrsz)) } function str_md5(A) { return binl2str(core_md5(str2binl(A), A.length * chrsz)) } function hex_hmac_md5(A, B) { return binl2hex(core_hmac_md5(A, B)) } function b64_hmac_md5(A, B) { return binl2b64(core_hmac_md5(A, B)) } function str_hmac_md5(A, B) { return binl2str(core_hmac_md5(A, B)) } function core_md5(K, F) { K[F >> 5] |= 128 << ((F) % 32); K[(((F + 64) >>> 9) << 4) + 14] = F; var J = 1732584193; var I = -271733879; var H = -1732584194; var G = 271733878; for (var C = 0; C < K.length; C += 16) { var E = J; var D = I; var B = H; var A = G; J = md5_ff(J, I, H, G, K[C + 0], 7, -680876936); G = md5_ff(G, J, I, H, K[C + 1], 12, -389564586); H = md5_ff(H, G, J, I, K[C + 2], 17, 606105819); I = md5_ff(I, H, G, J, K[C + 3], 22, -1044525330); J = md5_ff(J, I, H, G, K[C + 4], 7, -176418897); G = md5_ff(G, J, I, H, K[C + 5], 12, 1200080426); H = md5_ff(H, G, J, I, K[C + 6], 17, -1473231341); I = md5_ff(I, H, G, J, K[C + 7], 22, -45705983); J = md5_ff(J, I, H, G, K[C + 8], 7, 1770035416); G = md5_ff(G, J, I, H, K[C + 9], 12, -1958414417); H = md5_ff(H, G, J, I, K[C + 10], 17, -42063); I = md5_ff(I, H, G, J, K[C + 11], 22, -1990404162); J = md5_ff(J, I, H, G, K[C + 12], 7, 1804603682); G = md5_ff(G, J, I, H, K[C + 13], 12, -40341101); H = md5_ff(H, G, J, I, K[C + 14], 17, -1502002290); I = md5_ff(I, H, G, J, K[C + 15], 22, 1236535329); J = md5_gg(J, I, H, G, K[C + 1], 5, -165796510); G = md5_gg(G, J, I, H, K[C + 6], 9, -1069501632); H = md5_gg(H, G, J, I, K[C + 11], 14, 643717713); I = md5_gg(I, H, G, J, K[C + 0], 20, -373897302); J = md5_gg(J, I, H, G, K[C + 5], 5, -701558691); G = md5_gg(G, J, I, H, K[C + 10], 9, 38016083); H = md5_gg(H, G, J, I, K[C + 15], 14, -660478335); I = md5_gg(I, H, G, J, K[C + 4], 20, -405537848); J = md5_gg(J, I, H, G, K[C + 9], 5, 568446438); G = md5_gg(G, J, I, H, K[C + 14], 9, -1019803690); H = md5_gg(H, G, J, I, K[C + 3], 14, -187363961); I = md5_gg(I, H, G, J, K[C + 8], 20, 1163531501); J = md5_gg(J, I, H, G, K[C + 13], 5, -1444681467); G = md5_gg(G, J, I, H, K[C + 2], 9, -51403784); H = md5_gg(H, G, J, I, K[C + 7], 14, 1735328473); I = md5_gg(I, H, G, J, K[C + 12], 20, -1926607734); J = md5_hh(J, I, H, G, K[C + 5], 4, -378558); G = md5_hh(G, J, I, H, K[C + 8], 11, -2022574463); H = md5_hh(H, G, J, I, K[C + 11], 16, 1839030562); I = md5_hh(I, H, G, J, K[C + 14], 23, -35309556); J = md5_hh(J, I, H, G, K[C + 1], 4, -1530992060); G = md5_hh(G, J, I, H, K[C + 4], 11, 1272893353); H = md5_hh(H, G, J, I, K[C + 7], 16, -155497632); I = md5_hh(I, H, G, J, K[C + 10], 23, -1094730640); J = md5_hh(J, I, H, G, K[C + 13], 4, 681279174); G = md5_hh(G, J, I, H, K[C + 0], 11, -358537222); H = md5_hh(H, G, J, I, K[C + 3], 16, -722521979); I = md5_hh(I, H, G, J, K[C + 6], 23, 76029189); J = md5_hh(J, I, H, G, K[C + 9], 4, -640364487); G = md5_hh(G, J, I, H, K[C + 12], 11, -421815835); H = md5_hh(H, G, J, I, K[C + 15], 16, 530742520); I = md5_hh(I, H, G, J, K[C + 2], 23, -995338651); J = md5_ii(J, I, H, G, K[C + 0], 6, -198630844); G = md5_ii(G, J, I, H, K[C + 7], 10, 1126891415); H = md5_ii(H, G, J, I, K[C + 14], 15, -1416354905); I = md5_ii(I, H, G, J, K[C + 5], 21, -57434055); J = md5_ii(J, I, H, G, K[C + 12], 6, 1700485571); G = md5_ii(G, J, I, H, K[C + 3], 10, -1894986606); H = md5_ii(H, G, J, I, K[C + 10], 15, -1051523); I = md5_ii(I, H, G, J, K[C + 1], 21, -2054922799); J = md5_ii(J, I, H, G, K[C + 8], 6, 1873313359); G = md5_ii(G, J, I, H, K[C + 15], 10, -30611744); H = md5_ii(H, G, J, I, K[C + 6], 15, -1560198380); I = md5_ii(I, H, G, J, K[C + 13], 21, 1309151649); J = md5_ii(J, I, H, G, K[C + 4], 6, -145523070); G = md5_ii(G, J, I, H, K[C + 11], 10, -1120210379); H = md5_ii(H, G, J, I, K[C + 2], 15, 718787259); I = md5_ii(I, H, G, J, K[C + 9], 21, -343485551); J = safe_add(J, E); I = safe_add(I, D); H = safe_add(H, B); G = safe_add(G, A) } if (mode == 16) { return Array(I, H) } else { return Array(J, I, H, G) } } function md5_cmn(F, C, B, A, E, D) { return safe_add(bit_rol(safe_add(safe_add(C, F), safe_add(A, D)), E), B) } function md5_ff(C, B, G, F, A, E, D) { return md5_cmn((B & G) | ((~B) & F), C, B, A, E, D) } function md5_gg(C, B, G, F, A, E, D) { return md5_cmn((B & F) | (G & (~F)), C, B, A, E, D) } function md5_hh(C, B, G, F, A, E, D) { return md5_cmn(B ^ G ^ F, C, B, A, E, D) } function md5_ii(C, B, G, F, A, E, D) { return md5_cmn(G ^ (B | (~F)), C, B, A, E, D) } function core_hmac_md5(C, F) { var E = str2binl(C); if (E.length > 16) { E = core_md5(E, C.length * chrsz) } var A = Array(16), D = Array(16); for (var B = 0; B < 16; B++) { A[B] = E[B] ^ 909522486; D[B] = E[B] ^ 1549556828 } var G = core_md5(A.concat(str2binl(F)), 512 + F.length * chrsz); return core_md5(D.concat(G), 512 + 128) } function safe_add(A, D) { var C = (A & 65535) + (D & 65535); var B = (A >> 16) + (D >> 16) + (C >> 16); return (B << 16) | (C & 65535) } function bit_rol(A, B) { return (A << B) | (A >>> (32 - B)) } function str2binl(D) { var C = Array(); var A = (1 << chrsz) - 1; for (var B = 0; B < D.length * chrsz; B += chrsz) { C[B >> 5] |= (D.charCodeAt(B / chrsz) & A) << (B % 32) } return C } function binl2str(C) { var D = ""; var A = (1 << chrsz) - 1; for (var B = 0; B < C.length * 32; B += chrsz) { D += String.fromCharCode((C[B >> 5] >>> (B % 32)) & A) } return D } function binl2hex(C) { var B = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; var D = ""; for (var A = 0; A < C.length * 4; A++) { D += B.charAt((C[A >> 2] >> ((A % 4) * 8 + 4)) & 15) + B.charAt((C[A >> 2] >> ((A % 4) * 8)) & 15) } return D } function binl2b64(D) { var C = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; var F = ""; for (var B = 0; B < D.length * 4; B += 3) { var E = (((D[B >> 2] >> 8 * (B % 4)) & 255) << 16) | (((D[B + 1 >> 2] >> 8 * ((B + 1) % 4)) & 255) << 8) | ((D[B + 2 >> 2] >> 8 * ((B + 2) % 4)) & 255); for (var A = 0; A < 4; A++) { if (B * 8 + A * 6 > D.length * 32) { F += b64pad } else { F += C.charAt((E >> 6 * (3 - A)) & 63) } } } return F } function hexchar2bin(str) { var arr = []; for (var i = 0; i < str.length; i = i + 2) { arr.push("\\x" + str.substr(i, 2)) } arr = arr.join(""); eval("var temp = '" + arr + "'"); return temp }
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