postmain 通过函数动态设置参数

调用服务器的服务，其中有个参数是签名，签名需要计算，需要写一个本地函数。

下一步

pre-request Script 的代码如下：

(function($) {

    if(!$.encoding)
        $.encoding = {};
    $.extend($.encoding,{
        strToBe32s: function(str) {
            // Convert a string to an array of big-endian 32-bit words
            var be=[];
            var len=Math.floor(str.length/4);
            var i, j;
            for(i=0, j=0; i<len; i++, j+=4) {
                be[i]=((str.charCodeAt(j)&0xff) << 24)|((str.charCodeAt(j+1)&0xff) << 16)|((str.charCodeAt(j+2)&0xff) << 8)|(str.charCodeAt(j+3)&0xff);
            }
            while(j<str.length) {
                be[j>>2] |= (str.charCodeAt(j)&0xff)<<(24-(j*8)%32);
                j++;
            }
            return be;
        },
        be32sToStr: function(be) {
            // Convert an array of big-endian 32-bit words to a string
            var str='';
            for(var i=0;i<be.length*32;i+=8) {
                str += String.fromCharCode((be[i>>5]>>>(24-i%32)) & 0xff);
            }
            return str;
        },
        be32sToHex: function(be) {
            // Convert an array of big-endian 32-bit words to a hex string
            var hex='0123456789ABCDEF';
            var str='';
            for(var i=0;i<be.length*4;i++) {
                str += hex.charAt((be[i>>2]>>((3-i%4)*8+4))&0xF) + hex.charAt((be[i>>2]>>((3-i%4)*8))&0xF);
            }
            return str;
        }
    });
})(jQuery);

(function($) {

    if(!$.encoding.digests)
        $.encoding.digests = {};
    $.extend($.encoding.digests,{
        hexSha1Str: function(str) {
            // Return, in hex, the SHA-1 hash of a string
            return $.encoding.be32sToHex($.encoding.digests.sha1Str(str));
        },
        sha1Str: function(str) {
            // Return the SHA-1 hash of a string
            return sha1($.encoding.strToBe32s(str),str.length);
        },
        sha1: function(x,blen) {
            // Calculate the SHA-1 hash of an array of blen bytes of big-endian 32-bit words
            return sha1($.encoding.strToBe32s(str),str.length);
        }
    });

    // Private functions.
    function sha1(x,blen) {
        // Calculate the SHA-1 hash of an array of blen bytes of big-endian 32-bit words
        function add32(a,b) {
            // Add 32-bit integers, wrapping at 32 bits
            // Uses 16-bit operations internally to work around bugs in some JavaScript interpreters.
            var lsw=(a&0xFFFF)+(b&0xFFFF);
            var msw=(a>>16)+(b>>16)+(lsw>>16);
            return (msw<<16)|(lsw&0xFFFF);
        }
        function AA(a,b,c,d,e) {
            // Cryptographic round helper function. Add five 32-bit integers, wrapping at 32 bits, second parameter is rotated left 5 bits before the addition
            // Uses 16-bit operations internally to work around bugs in some JavaScript interpreters.
            b=(b>>>27)|(b<<5);
            var lsw=(a&0xFFFF)+(b&0xFFFF)+(c&0xFFFF)+(d&0xFFFF)+(e&0xFFFF);
            var msw=(a>>16)+(b>>16)+(c>>16)+(d>>16)+(e>>16)+(lsw>>16);
            return (msw<<16)|(lsw&0xFFFF);
        }
        function RR(w,j) {
            // Cryptographic round helper function.
            var n=w[j-3]^w[j-8]^w[j-14]^w[j-16];
            return (n>>>31)|(n<<1);
        }

        var len=blen*8;
        //# Append padding so length in bits is 448 mod 512
        x[len>>5] |= 0x80 << (24-len%32);
        //# Append length
        x[((len+64>>9)<<4)+15]=len;
        var w=new Array(80);

        var k1=0x5A827999;
        var k2=0x6ED9EBA1;
        var k3=0x8F1BBCDC;
        var k4=0xCA62C1D6;

        var h0=0x67452301;
        var h1=0xEFCDAB89;
        var h2=0x98BADCFE;
        var h3=0x10325476;
        var h4=0xC3D2E1F0;

        for(var i=0;i<x.length;i+=16) {
            var j=0;
            var t;
            var a=h0;
            var b=h1;
            var c=h2;
            var d=h3;
            var e=h4;
            while(j<16) {
                w[j]=x[i+j];
                t=AA(e,a,d^(b&(c^d)),w[j],k1);
                e=d; d=c; c=(b>>>2)|(b<<30); b=a; a=t; j++;
            }
            while(j<20) {
                w[j]=RR(w,j);
                t=AA(e,a,d^(b&(c^d)),w[j],k1);
                e=d; d=c; c=(b>>>2)|(b<<30); b=a; a=t; j++;
            }
            while(j<40) {
                w[j]=RR(w,j);
                t=AA(e,a,b^c^d,w[j],k2);
                e=d; d=c; c=(b>>>2)|(b<<30); b=a; a=t; j++;
            }
            while(j<60) {
                w[j]=RR(w,j);
                t=AA(e,a,(b&c)|(d&(b|c)),w[j],k3);
                e=d; d=c; c=(b>>>2)|(b<<30); b=a; a=t; j++;
            }
            while(j<80) {
                w[j]=RR(w,j);
                t=AA(e,a,b^c^d,w[j],k4);
                e=d; d=c; c=(b>>>2)|(b<<30); b=a; a=t; j++;
            }
            h0=add32(h0,a);
            h1=add32(h1,b);
            h2=add32(h2,c);
            h3=add32(h3,d);
            h4=add32(h4,e);
        }
        return [h0,h1,h2,h3,h4];
    }
})(jQuery);

 function signBySha1(data){
     data={"appKey":"00001","messageFormat":"json","method":"user.getSession","userName":"tomson","sign":"","v":"1.0","secret":"abcdeabcdeabcdeabcdeabcde"};

          var secret ='abcdeabcdeabcdeabcdeabcde';
          var tempStr = secret+ "appKey"+data["appKey"];
          tempStr += "messageFormat"+data["messageFormat"];
          tempStr += "method"+data["method"];
         // tempStr += "password"+data["password"];
          tempStr +="secret"+data["secret"];
          tempStr += "userName"+data["userName"];
          tempStr += "v"+data["v"];

          tempStr += secret;
          var signData = $.encoding.digests.hexSha1Str(tempStr);
         // data["sign"]=signData;
          return signData;
        }

postman.setGlobalVariable("sign", signBySha1());
 

postman.setGlobalVariable("sign", signBySha1());是设置全局变量

ok，完成了