package com.sinata.appointment.integration;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.sinata.appointment.config.WechatMiniAppProperties;
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import com.sinata.appointment.constants.BizErrorCode;
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import com.sinata.appointment.exception.BizException;
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import java.util.concurrent.locks.ReentrantLock;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.factory.annotation.Qualifier;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.MediaType;
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import org.springframework.stereotype.Service;
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import org.springframework.web.client.RestTemplate;
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import org.springframework.web.util.UriComponentsBuilder;
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/**
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* 微信小程序服务端：js_code → openId；access_token + phoneCode → 手机号。
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*
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* <p>官方文档：code2session、getAccessToken(client_credential)、getuserphonenumber。
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*/
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@Slf4j
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@Service
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public class WechatMiniGateway {
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private static final String JSCODE2SESSION =
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"https://api.weixin.qq.com/sns/jscode2session";
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private static final String CGI_BIN_TOKEN =
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"https://api.weixin.qq.com/cgi-bin/token";
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private static final String GET_USER_PHONE =
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"https://api.weixin.qq.com/wxa/business/getuserphonenumber";
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private final WechatMiniAppProperties props;
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private final RestTemplate restTemplate;
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private final ObjectMapper objectMapper;
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private final ReentrantLock tokenLock = new ReentrantLock();
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private volatile String cachedAccessToken;
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private volatile long accessTokenExpireAtEpochMs;
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public WechatMiniGateway(
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WechatMiniAppProperties props,
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@Qualifier("wechatRestTemplate") RestTemplate restTemplate,
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ObjectMapper objectMapper) {
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this.props = props;
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this.restTemplate = restTemplate;
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this.objectMapper = objectMapper;
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}
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public WxCode2SessionResult code2Session(String jsCode) {
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if (jsCode == null || jsCode.isBlank()) {
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throw new BizException(BizErrorCode.AUTH_INVALID_CREDENTIALS, "wxCode 不能为空");
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}
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if (props.useStub()) {
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log.debug("Wechat mini stub: code2Session");
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return WxCode2SessionResult.stub(jsCode);
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}
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String url =
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UriComponentsBuilder.fromHttpUrl(JSCODE2SESSION)
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.queryParam("appid", props.getAppId())
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.queryParam("secret", props.getAppSecret())
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.queryParam("js_code", jsCode)
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.queryParam("grant_type", "authorization_code")
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.build()
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.toUriString();
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try {
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String body = restTemplate.getForObject(url, String.class);
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JsonNode root = objectMapper.readTree(body);
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int err = root.path("errcode").asInt(0);
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if (err != 0) {
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String msg = root.path("errmsg").asText("wx error");
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log.warn("code2session errcode={} msg={}", err, msg);
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "微信登录失败: " + msg);
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}
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String openId = root.path("openid").asText(null);
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if (openId == null || openId.isBlank()) {
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "微信未返回 openid");
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}
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return WxCode2SessionResult.builder()
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.openId(openId)
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.unionId(root.path("unionid").asText(null))
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.sessionKey(root.path("session_key").asText(null))
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.build();
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} catch (BizException e) {
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throw e;
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} catch (Exception e) {
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log.error("code2session http error", e);
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "微信接口调用异常");
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}
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}
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/**
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* @param phoneCode 前端 button open-type=getPhoneNumber 回调中的 code（非手机号明文）
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*/
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public String getPhoneNumber(String phoneCode) {
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if (phoneCode == null || phoneCode.isBlank()) {
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throw new BizException(BizErrorCode.AUTH_INVALID_CREDENTIALS, "phoneCode 不能为空");
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}
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if (props.useStub()) {
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int h = Math.abs(phoneCode.hashCode() % 100_000_000);
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String stubPhone = "138" + String.format("%08d", h);
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log.debug("Wechat mini stub: phoneCode -> {}", stubPhone);
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return stubPhone;
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}
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String token = getAccessToken();
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String url =
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UriComponentsBuilder.fromHttpUrl(GET_USER_PHONE)
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.queryParam("access_token", token)
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.build()
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.toUriString();
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try {
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String reqJson = objectMapper.createObjectNode().put("code", phoneCode).toString();
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HttpHeaders headers = new HttpHeaders();
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headers.setContentType(MediaType.APPLICATION_JSON);
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String body =
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restTemplate.postForObject(url, new HttpEntity<>(reqJson, headers), String.class);
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JsonNode root = objectMapper.readTree(body);
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int err = root.path("errcode").asInt(-1);
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if (err != 0) {
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String msg = root.path("errmsg").asText("wx error");
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log.warn("getuserphonenumber errcode={} msg={}", err, msg);
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "获取手机号失败: " + msg);
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}
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String phone = root.path("phone_info").path("purePhoneNumber").asText(null);
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if (phone == null || phone.isBlank()) {
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phone = root.path("phone_info").path("phoneNumber").asText(null);
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}
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if (phone == null || phone.isBlank()) {
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "微信未返回手机号");
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}
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return phone;
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} catch (BizException e) {
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throw e;
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} catch (Exception e) {
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log.error("getuserphonenumber http error", e);
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "微信手机号接口异常");
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}
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}
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private String getAccessToken() {
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tokenLock.lock();
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try {
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long now = System.currentTimeMillis();
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if (cachedAccessToken != null && now < accessTokenExpireAtEpochMs - 120_000) {
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return cachedAccessToken;
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}
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String url =
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UriComponentsBuilder.fromHttpUrl(CGI_BIN_TOKEN)
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.queryParam("grant_type", "client_credential")
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.queryParam("appid", props.getAppId())
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.queryParam("secret", props.getAppSecret())
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.build()
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.toUriString();
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String body = restTemplate.getForObject(url, String.class);
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JsonNode root = objectMapper.readTree(body);
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int err = root.path("errcode").asInt(0);
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if (err != 0) {
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throw new BizException(
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BizErrorCode.MINI_WX_API_ERROR,
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"获取 access_token 失败: " + root.path("errmsg").asText());
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}
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String token = root.path("access_token").asText(null);
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int expiresIn = root.path("expires_in").asInt(7200);
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if (token == null || token.isBlank()) {
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "微信未返回 access_token");
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}
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cachedAccessToken = token;
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accessTokenExpireAtEpochMs = now + expiresIn * 1000L;
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return token;
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} catch (BizException e) {
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throw e;
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} catch (Exception e) {
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log.error("getAccessToken error", e);
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throw new BizException(BizErrorCode.MINI_WX_API_ERROR, "获取 access_token 异常");
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} finally {
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tokenLock.unlock();
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}
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}
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}
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