Server Access

              
              String signToken = new HmacUtils(HmacAlgorithms.HMAC_SHA_256, captchaKey).hmacHex(lotNumber);

            

              
              {
    "lot_number": "f26d13345c9980c7705b9111b9398a0f",
    "captcha_id": "59bbe0f128f0624fdd185a6a2207aa54",
    "sign_token": "2e61e2f6d40e2896b18978fe6ae1416347fc43027ab7c875460d17ffa149dd7a",
    "pass_token": "79a4b7fc89d917b346d35286991bc9bca388a78bd31c20fa00907dcb8632611c",
    "gen_time": "1684826917",
    "captcha_output": "X4oDQ5p61MhE0Zpy5wQcl98WjrDdlDyL5B_VO0zPYnS9ITuz1ZZ6o0iw4Odk9f0AbAlzraqmeLGSmQWHPwJr2Vvf_Nm2Z0SMCn2ATME67e5UhMdopMgc8_zZi-SFRyH1"
}

            

              
              {
    "status": "success",
    "data": {
        "captcha_args": {
            "cnn_records": 0,
            "lot_number": "a989b864ad08cc08f270c22d9ab1fba0",
            "model_cnn": 0,
            "model_probability": 0,
            "used_type": "slide",
            "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36",
            "user_ip": "59.174.224.96",
            "user_referer": "http://127.0.0.1:5000/",
            "web_simulator": 0
        },
        "reason": "validate success",
        "result": "success"
    }
}

            

              
              package com.engagelab.demo.controller;

import org.apache.commons.codec.digest.HmacAlgorithms;
import org.apache.commons.codec.digest.HmacUtils;
import org.json.JSONObject;
import org.springframework.http.*;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.HashMap;
import java.util.Map;

@RestController
public class MainController {


    @RequestMapping(value = "/login", method = {RequestMethod.GET})
    public String userLogin(@RequestParam Map<String, String> getParams) {
        // 1. Initialize parameter information, needs to be consistent with the captchaId used by the frontend, or can be placed in the configuration file
        String captchaId = "37830cbb24f5a2134d39c7cf3093bc14";
        String captchaKey = "ab8aeb88a3c30e170ab04af8ada6e6ec";
        // domain is the domain name of EngageLab's verification code service
        String domain = "https://captcha-api.engagelab.com";

        // 2. Get the verification serial number and other parameters passed from the frontend after user verification
        String lotNumber = getParams.get("lot_number");
        String captchaOutput = getParams.get("captcha_output");
        String passToken = getParams.get("pass_token");
        String genTime = getParams.get("gen_time");

        // 3. Generate signature
        String signToken = new HmacUtils(HmacAlgorithms.HMAC_SHA_256, captchaKey).hmacHex(lotNumber);

        // 4. Upload verification parameters to the secondary verification interface to validate the user verification status
        Map<String, String> queryParams = new HashMap<>();
        queryParams.put("captcha_id", captchaId);
        queryParams.put("lot_number", lotNumber);
        queryParams.put("captcha_output", captchaOutput);
        queryParams.put("pass_token", passToken);
        queryParams.put("gen_time", genTime);
        queryParams.put("sign_token", signToken);

        String url = String.format(domain + "/validate");
        SimpleClientHttpRequestFactory clientHttpRequestFactory = new SimpleClientHttpRequestFactory();
        clientHttpRequestFactory.setConnectTimeout(3000);  // Set connection timeout
        clientHttpRequestFactory.setReadTimeout(1500);  // Set Read timeout
        RestTemplate client = new RestTemplate();
        client.setRequestFactory(clientHttpRequestFactory);

        JSONObject responseJsonObject = new JSONObject();
        try { 
            RequestEntity<Map<String, String>> requestEntity = RequestEntity.post(url).accept(MediaType.APPLICATION_JSON).body(queryParams);
            ResponseEntity<String> response = client.exchange(requestEntity, String.class);
            String resBody = response.getBody();
            responseJsonObject = new JSONObject(resBody);
        }catch (Exception e){
            responseJsonObject.put("status", "success");
            responseJsonObject.put("data", new JSONObject("{\"result\": \"success\", \"reason\": \"request captcha api fail\"}"));
        }

        JSONObject res = new JSONObject();
        String status = responseJsonObject.getString("status");
        if (status.equals("success")) {
            String data = responseJsonObject.getJSONObject("data").getString("result");
            if (data.equals("success")) {
                res.put("login", "success");
                res.put("reason", responseJsonObject.getJSONObject("data").getString("reason"));
            } else {
                res.put("login", "fail");
                res.put("reason", responseJsonObject.getJSONObject("data").getString("reason"));
            }
            JSONObject captchaArgs = responseJsonObject.getJSONObject("data").getJSONObject("captcha_args");
            Integer model_probability = captchaArgs.getInt("model_probability");
            System.out.println("The captcha recognition result is: " + model_probability);
        } else {
            res.put("login", "fail");
            res.put("reason", "captcha verify fail");
        }
        return res.toString();

    }
}