package com.tcm.training.admin.app.auth.service;
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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.tcm.training.admin.app.auth.config.AppWechatAuthProperties;
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import com.tcm.training.admin.app.auth.dto.AppWechatLoginRequest;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.stereotype.Service;
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import org.springframework.web.client.RestOperations;
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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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* 微信登录接口客户端，负责换取授权信息并拉取微信头像昵称。
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*/
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@Service
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public class AppWechatAuthClient {
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private static final Logger log = LoggerFactory.getLogger(AppWechatAuthClient.class);
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private final AppWechatAuthProperties properties;
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private final ObjectMapper objectMapper;
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private final RestOperations restOperations;
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/**
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* 使用默认 HTTP 客户端构造微信认证客户端。
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*/
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public AppWechatAuthClient(AppWechatAuthProperties properties, ObjectMapper objectMapper) {
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this(properties, objectMapper, new RestTemplate());
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}
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/**
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* 注入微信配置、JSON 解析器与 HTTP 客户端。
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*/
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AppWechatAuthClient(AppWechatAuthProperties properties,
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ObjectMapper objectMapper,
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RestOperations restOperations) {
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this.properties = properties;
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this.objectMapper = objectMapper;
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this.restOperations = restOperations;
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}
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/**
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* 按当前请求中的授权信息换取微信用户资料。
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*/
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public AppWechatUserProfile resolveUserProfile(AppWechatLoginRequest request) {
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if (request == null) {
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throw new IllegalArgumentException("微信授权信息不完整");
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}
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String accessToken = trimToNull(request.getAccessToken());
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String openid = trimToNull(request.getOpenid());
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String unionid = trimToNull(request.getUnionid());
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if (accessToken != null && openid != null) {
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AppWechatUserProfile profile = fetchUserInfo(accessToken, openid);
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if (profile.getUnionid() == null) {
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profile.setUnionid(unionid);
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}
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return profile;
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}
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String code = trimToNull(request.getCode());
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if (code == null) {
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throw new IllegalArgumentException("微信授权信息不完整");
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}
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if (!properties.isServerAuthConfigured()) {
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throw new IllegalArgumentException("微信登录暂未配置，请稍后重试");
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}
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WechatAccessTokenSnapshot tokenSnapshot = exchangeCode(code);
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AppWechatUserProfile profile = fetchUserInfo(tokenSnapshot.getAccessToken(), tokenSnapshot.getOpenid());
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if (profile.getUnionid() == null) {
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profile.setUnionid(tokenSnapshot.getUnionid());
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}
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return profile;
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}
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/**
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* 使用临时 code 向微信换取 accessToken 与 openid。
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*/
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private WechatAccessTokenSnapshot exchangeCode(String code) {
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String url = UriComponentsBuilder.fromHttpUrl(properties.getAccessTokenUrl())
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.queryParam("appid", properties.getAppId())
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.queryParam("secret", properties.getAppSecret())
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.queryParam("code", code)
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.queryParam("grant_type", "authorization_code")
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.build(true)
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.toUriString();
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JsonNode payload = getWechatPayload(url, "微信登录授权失败");
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ensureWechatSuccess(payload, "微信登录授权失败");
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String accessToken = trimToNull(readText(payload, "access_token"));
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String openid = trimToNull(readText(payload, "openid"));
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if (accessToken == null || openid == null) {
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throw new IllegalArgumentException("微信登录授权失败");
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}
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WechatAccessTokenSnapshot snapshot = new WechatAccessTokenSnapshot();
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snapshot.setAccessToken(accessToken);
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snapshot.setOpenid(openid);
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snapshot.setUnionid(trimToNull(readText(payload, "unionid")));
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return snapshot;
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}
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/**
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* 使用微信 accessToken 与 openid 拉取昵称、头像和性别。
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*/
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private AppWechatUserProfile fetchUserInfo(String accessToken, String openid) {
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String url = UriComponentsBuilder.fromHttpUrl(properties.getUserInfoUrl())
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.queryParam("access_token", accessToken)
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.queryParam("openid", openid)
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.queryParam("lang", "zh_CN")
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.build(true)
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.toUriString();
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JsonNode payload = getWechatPayload(url, "获取微信用户信息失败");
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ensureWechatSuccess(payload, "获取微信用户信息失败");
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AppWechatUserProfile profile = new AppWechatUserProfile();
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profile.setOpenid(openid);
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profile.setUnionid(trimToNull(readText(payload, "unionid")));
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profile.setNickname(trimToNull(readText(payload, "nickname")));
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profile.setAvatar(trimToNull(readText(payload, "headimgurl")));
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profile.setSex(readInteger(payload, "sex"));
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return profile;
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}
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/**
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* 发起微信接口调用并将响应解析为 JSON。
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*/
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private JsonNode getWechatPayload(String url, String failureMessage) {
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try {
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String responseBody = restOperations.getForObject(url, String.class);
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if (responseBody == null || responseBody.trim().isEmpty()) {
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throw new IllegalArgumentException(failureMessage);
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}
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return objectMapper.readTree(responseBody);
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} catch (IllegalArgumentException ex) {
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throw ex;
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} catch (Exception ex) {
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log.error("调用微信接口失败: url={}", url, ex);
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throw new IllegalArgumentException(failureMessage);
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}
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}
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/**
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* 校验微信接口返回是否为成功态。
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*/
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private void ensureWechatSuccess(JsonNode payload, String failureMessage) {
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Integer errcode = readInteger(payload, "errcode");
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if (errcode == null || errcode == 0) {
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return;
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}
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String errmsg = trimToNull(readText(payload, "errmsg"));
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if (errmsg == null) {
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errmsg = failureMessage;
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}
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log.warn("微信接口返回异常: errcode={}, errmsg={}", errcode, errmsg);
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throw new IllegalArgumentException(errmsg);
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}
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/**
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* 读取字符串字段。
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*/
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private String readText(JsonNode payload, String fieldName) {
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JsonNode valueNode = payload.get(fieldName);
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if (valueNode == null || valueNode.isNull()) {
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return null;
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}
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return valueNode.asText();
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}
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/**
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* 读取整数字段。
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*/
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private Integer readInteger(JsonNode payload, String fieldName) {
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String value = trimToNull(readText(payload, fieldName));
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if (value == null) {
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return null;
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}
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try {
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return Integer.valueOf(value);
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} catch (NumberFormatException ex) {
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return null;
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}
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}
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/**
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* 将空白字符串归一化为 null。
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*/
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private String trimToNull(String value) {
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if (value == null) {
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return null;
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}
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String trimmed = value.trim();
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return trimmed.isEmpty() ? null : trimmed;
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}
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/**
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* 保存微信换票结果，避免在多个私有方法之间散落参数。
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*/
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private static class WechatAccessTokenSnapshot {
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private String accessToken;
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private String openid;
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private String unionid;
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/**
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* 获取 accessToken。
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*/
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public String getAccessToken() {
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return accessToken;
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}
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/**
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* 设置 accessToken。
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*/
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public void setAccessToken(String accessToken) {
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this.accessToken = accessToken;
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}
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/**
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* 获取 openid。
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*/
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public String getOpenid() {
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return openid;
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}
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/**
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* 设置 openid。
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*/
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public void setOpenid(String openid) {
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this.openid = openid;
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}
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/**
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* 获取 unionid。
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*/
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public String getUnionid() {
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return unionid;
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}
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/**
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* 设置 unionid。
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*/
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public void setUnionid(String unionid) {
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this.unionid = unionid;
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}
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}
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}
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