前台Html页面
"margin:300px;" >
"yzm">
后台验证码处理
if (Request["action"]==GeeTestHelper.Create) { Response.ContentType = "application/json"; GeeTestHelper geetest = new GeeTestHelper("846e30599eb209b6aad0b8c2477fccb5", "f5a7e9d5bbc6b79bb1812dbfb5898215"); String userID = "test"; Byte gtServerStatus = geetest.preProcess(userID); Session[GeeTestHelper.gtServerStatusSessionKey] = gtServerStatus; Session["GeetestUserTest"] = userID; string s = geetest.getResponseStr(); Response.Write(s); Response.End(); } if (Request["action"]==GeeTestHelper.Check) { GeeTestHelper geetest = new GeeTestHelper("846e30599eb209b6aad0b8c2477fccb5", "f5a7e9d5bbc6b79bb1812dbfb5898215"); Byte gt_server_status_code = (Byte)Session[GeeTestHelper.gtServerStatusSessionKey]; String userID = (String)Session["GeetestUserTest"]; int result = 0; String challenge = Request[GeeTestHelper.fnGeetestChallenge]; String validate = Request[GeeTestHelper.fnGeetestValidate]; String seccode = Request[GeeTestHelper.fnGeetestSeccode]; if (gt_server_status_code == 1) { result = geetest.enhencedValidateRequest(challenge, validate, seccode, userID); } else result = geetest.failbackValidateRequest(challenge, validate, seccode); if (result == 1) Response.Write("ok"); else Response.Write("error"); }
GeeTestHelper
using System; using System.Collections; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Security.Cryptography; using System.Text; using System.Web; public class GeeTestHelper { ////// SDK版本号 /// public const String version = "3.2.0"; public const string Create = "Create"; public const string Check = "Check"; /// /// SDK开发语言 /// public const String sdkLang = "csharp"; /// /// 极验验证API URL /// protected const String apiUrl = "http://api.geetest.com"; /// /// register url /// protected const String registerUrl = "/register.php"; /// /// validate url /// protected const String validateUrl = "/validate.php"; /// /// 极验验证API服务状态Session Key /// public const String gtServerStatusSessionKey = "gt_server_status"; /// /// 极验验证二次验证表单数据 Chllenge /// public const String fnGeetestChallenge = "geetest_challenge"; /// /// 极验验证二次验证表单数据 Validate /// public const String fnGeetestValidate = "geetest_validate"; /// /// 极验验证二次验证表单数据 Seccode /// public const String fnGeetestSeccode = "geetest_seccode"; private String userID = ""; private String responseStr = ""; private String captchaID = ""; private String privateKey = ""; /// /// 验证成功结果字符串 /// public const int successResult = 1; /// /// 证结失败验果字符串 /// public const int failResult = 0; /// /// 判定为机器人结果字符串 /// public const String forbiddenResult = "forbidden"; /// /// GeetestLib构造函数 /// /// 极验验证公钥 /// 极验验证私钥 public GeeTestHelper(String publicKey, String privateKey) { this.privateKey = privateKey; this.captchaID = publicKey; } private int getRandomNum() { Random rand = new Random(); int randRes = rand.Next(100); return randRes; } /// /// 验证初始化预处理 /// /// 初始化结果 public Byte preProcess() { if (this.captchaID == null) { Console.WriteLine("publicKey is null!"); } else { String challenge = this.registerChallenge(); if (challenge.Length == 32) { this.getSuccessPreProcessRes(challenge); return 1; } else { this.getFailPreProcessRes(); Console.WriteLine("Server regist challenge failed!"); } } return 0; } public Byte preProcess(String userID) { if (this.captchaID == null) { Console.WriteLine("publicKey is null!"); } else { this.userID = userID; String challenge = this.registerChallenge(); if (challenge.Length == 32) { this.getSuccessPreProcessRes(challenge); return 1; } else { this.getFailPreProcessRes(); Console.WriteLine("Server regist challenge failed!"); } } return 0; } public String getResponseStr() { return this.responseStr; } /// /// 预处理失败后的返回格式串 /// private void getFailPreProcessRes() { int rand1 = this.getRandomNum(); int rand2 = this.getRandomNum(); String md5Str1 = this.md5Encode(rand1 + ""); String md5Str2 = this.md5Encode(rand2 + ""); String challenge = md5Str1 + md5Str2.Substring(0, 2); this.responseStr = "{" + string.Format( "\"success\":{0},\"gt\":\"{1}\",\"challenge\":\"{2}\"", 0, this.captchaID, challenge) + "}"; } /// /// 预处理成功后的标准串 /// private void getSuccessPreProcessRes(String challenge) { challenge = this.md5Encode(challenge + this.privateKey); this.responseStr = "{" + string.Format( "\"success\":{0},\"gt\":\"{1}\",\"challenge\":\"{2}\"", 1, this.captchaID, challenge) + "}"; } /// /// failback模式的验证方式 /// /// failback模式下用于与validate一起解码答案， 判断验证是否正确 /// failback模式下用于与challenge一起解码答案， 判断验证是否正确 /// failback模式下，其实是个没用的参数 /// 验证结果 public int failbackValidateRequest(String challenge, String validate, String seccode) { if (!this.requestIsLegal(challenge, validate, seccode)) return GeeTestHelper.failResult; String[] validateStr = validate.Split('_'); String encodeAns = validateStr[0]; String encodeFullBgImgIndex = validateStr[1]; String encodeImgGrpIndex = validateStr[2]; int decodeAns = this.decodeResponse(challenge, encodeAns); int decodeFullBgImgIndex = this.decodeResponse(challenge, encodeFullBgImgIndex); int decodeImgGrpIndex = this.decodeResponse(challenge, encodeImgGrpIndex); int validateResult = this.validateFailImage(decodeAns, decodeFullBgImgIndex, decodeImgGrpIndex); return validateResult; } private int validateFailImage(int ans, int full_bg_index, int img_grp_index) { const int thread = 3; String full_bg_name = this.md5Encode(full_bg_index + "").Substring(0, 10); String bg_name = md5Encode(img_grp_index + "").Substring(10, 10); String answer_decode = ""; for (int i = 0; i < 9; i++) { if (i % 2 == 0) answer_decode += full_bg_name.ElementAt(i); else if (i % 2 == 1) answer_decode += bg_name.ElementAt(i); } String x_decode = answer_decode.Substring(4); int x_int = Convert.ToInt32(x_decode, 16); int result = x_int % 200; if (result < 40) result = 40; if (Math.Abs(ans - result) < thread) return GeeTestHelper.successResult; else return GeeTestHelper.failResult; } private Boolean requestIsLegal(String challenge, String validate, String seccode) { if (challenge.Equals(string.Empty) || validate.Equals(string.Empty) || seccode.Equals(string.Empty)) return false; return true; } /// /// 向gt-server进行二次验证 /// /// 本次验证会话的唯一标识 /// 拖动完成后server端返回的验证结果标识字符串 /// 验证结果的校验码，如果gt-server返回的不与这个值相等则表明验证失败 /// 二次验证结果 public int enhencedValidateRequest(String challenge, String validate, String seccode) { if (!this.requestIsLegal(challenge, validate, seccode)) return GeeTestHelper.failResult; if (validate.Length > 0 && checkResultByPrivate(challenge, validate)) { String query = "seccode=" + seccode + "&sdk=csharp_" + GeeTestHelper.version; String response = ""; try { response = postValidate(query); } catch (Exception e) { Console.WriteLine(e); } if (response.Equals(md5Encode(seccode))) { return GeeTestHelper.successResult; } } return GeeTestHelper.failResult; } public int enhencedValidateRequest(String challenge, String validate, String seccode, String userID) { if (!this.requestIsLegal(challenge, validate, seccode)) return GeeTestHelper.failResult; if (validate.Length > 0 && checkResultByPrivate(challenge, validate)) { String query = "seccode=" + seccode + "&user_id=" + userID + "&sdk=csharp_" + GeeTestHelper.version; String response = ""; try { response = postValidate(query); } catch (Exception e) { Console.WriteLine(e); } if (response.Equals(md5Encode(seccode))) { return GeeTestHelper.successResult; } } return GeeTestHelper.failResult; } private String readContentFromGet(String url) { try { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Timeout = 20000; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); Stream myResponseStream = response.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")); String retString = myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close(); return retString; } catch { return ""; } } private String registerChallenge() { String url = ""; if (string.Empty.Equals(this.userID)) { url = string.Format("{0}{1}?gt={2}", GeeTestHelper.apiUrl, GeeTestHelper.registerUrl, this.captchaID); } else { url = string.Format("{0}{1}?gt={2}&user_id={3}", GeeTestHelper.apiUrl, GeeTestHelper.registerUrl, this.captchaID, this.userID); } string retString = this.readContentFromGet(url); return retString; } private Boolean checkResultByPrivate(String origin, String validate) { String encodeStr = md5Encode(privateKey + "geetest" + origin); return validate.Equals(encodeStr); } private String postValidate(String data) { String url = string.Format("{0}{1}", GeeTestHelper.apiUrl, GeeTestHelper.validateUrl); HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = Encoding.UTF8.GetByteCount(data); // 发送数据 Stream myRequestStream = request.GetRequestStream(); byte[] requestBytes = System.Text.Encoding.ASCII.GetBytes(data); myRequestStream.Write(requestBytes, 0, requestBytes.Length); myRequestStream.Close(); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); // 读取返回信息 Stream myResponseStream = response.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")); string retString = myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close(); return retString; } private int decodeRandBase(String challenge) { String baseStr = challenge.Substring(32, 2); List<int> tempList = new List<int>(); for (int i = 0; i < baseStr.Length; i++) { int tempAscii = (int)baseStr[i]; tempList.Add((tempAscii > 57) ? (tempAscii - 87) : (tempAscii - 48)); } int result = tempList.ElementAt(0) * 36 + tempList.ElementAt(1); return result; } private int decodeResponse(String challenge, String str) { if (str.Length > 100) return 0; int[] shuzi = new int[] { 1, 2, 5, 10, 50 }; String chongfu = ""; Hashtable key = new Hashtable(); int count = 0; for (int i = 0; i < challenge.Length; i++) { String item = challenge.ElementAt(i) + ""; if (chongfu.Contains(item)) continue; else { int value = shuzi[count % 5]; chongfu += item; count++; key.Add(item, value); } } int res = 0; for (int i = 0; i < str.Length; i++) res += (int)key[str[i] + ""]; res = res - this.decodeRandBase(challenge); return res; } private String md5Encode(String plainText) { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(plainText))); t2 = t2.Replace("-", ""); t2 = t2.ToLower(); return t2; } }