256 lines
9.7 KiB
PHP
256 lines
9.7 KiB
PHP
<?php
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namespace App\Services;
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use App\Exceptions\RepositoryException;
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use EasyWeChat\Pay\Application;
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use Illuminate\Http\Request;
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use Illuminate\Support\Facades\Log;
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use Throwable;
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/**
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* 微信官方支付服务（APIv3 小程序 JSAPI，基于 EasyWeChat Pay）
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*
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* - 统一下单：POST /v3/pay/transactions/jsapi → prepay_id → 商户私钥签名生成 wx.requestPayment 调起参数
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* - 交易查询：GET /v3/pay/transactions/out-trade-no/{商户订单号}
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* - 支付通知：Wechatpay-Signature 验签（配置平台证书/公钥时）+ APIv3 密钥 AES-256-GCM 解密报文
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*
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* 配置优先级：后台「系统设置 → 支付配置」(site_config pay.wxpay_*) > config/services.php（env）
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*/
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class WechatPayService
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{
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/** 通知应答码：成功 / 失败（微信收到 SUCCESS 才停止重推） */
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public const string NOTIFY_ACK_OK = 'SUCCESS';
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public const string NOTIFY_ACK_FAIL = 'FAIL';
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/** 交易状态：支付成功（交易查询 / 支付通知的 trade_state） */
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public const string TRADE_STATE_SUCCESS = 'SUCCESS';
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protected ?Application $application = null;
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/**
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* 统一下单（小程序 JSAPI）
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*
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* @param string $paymentNo 商户订单号（本系统支付单号）
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* @param string $amountYuan 金额（元，两位小数）
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* @param string $openid 付款人 openid
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* @param string $description 订单标题
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* @return array<string, mixed> wx.requestPayment 调起参数（timeStamp/nonceStr/package/signType/paySign）
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* @throws RepositoryException 未配置或下单失败
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*/
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public function createOrder(string $paymentNo, string $amountYuan, string $openid, string $description): array
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{
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$result = $this->call('POST', '/v3/pay/transactions/jsapi', [
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'appid' => $this->appid(),
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'mchid' => $this->config('mch_id'),
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'description' => mb_substr($description, 0, 127),
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'out_trade_no' => $paymentNo,
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'notify_url' => $this->notifyUrl(),
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'amount' => [
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'total' => (int) bcmul($amountYuan, '100'), // APIv3 金额单位：分
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'currency' => 'CNY',
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],
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'payer' => ['openid' => $openid],
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], '下单');
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$prepayId = (string) ($result['prepay_id'] ?? '');
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if ($prepayId === '') {
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Log::driver('pay')->error('微信支付下单应答缺少 prepay_id', ['response' => $result]);
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throw new RepositoryException('微信支付下单失败：应答缺少 prepay_id');
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}
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$params = $this->app()->getUtils()->buildMiniAppConfig($prepayId, $this->appid());
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Log::driver('pay')->info('微信支付下单成功', ['out_trade_no' => $paymentNo, 'prepay_id' => $prepayId]);
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return $params;
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}
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/**
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* 交易查询（按商户订单号）
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*
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* @param string $paymentNo 商户订单号（本系统支付单号）
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* @return array<string, mixed> 微信交易报文（trade_state/transaction_id/success_time/amount.total 等）
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* @throws RepositoryException 查询失败
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*/
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public function queryOrder(string $paymentNo): array
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{
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return $this->call('GET', '/v3/pay/transactions/out-trade-no/' . $paymentNo, [
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'mchid' => $this->config('mch_id'),
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], '查询');
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}
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/**
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* 解密支付结果后台通知（配置平台证书/公钥时先验签，再以 APIv3 密钥 AES-256-GCM 解密）
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*
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* @return array<string, mixed> 解密后的交易报文（out_trade_no/trade_state/transaction_id/success_time/amount 等）
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* @throws RepositoryException 验签或解密失败
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*/
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public function decryptNotify(Request $request): array
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{
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Log::driver('pay')->info('微信支付通知接收', ['body' => $request->getContent()]);
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$app = $this->app();
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$server = $app->getServer();
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$server->setRequestFromSymfonyRequest($request);
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// 配置平台证书/公钥时校验 Wechatpay-Signature；未配置时依赖 AES-GCM 认证解密（APIv3 密钥仅微信与商户持有）
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if ($this->config('platform_cert') !== '' && $this->config('platform_serial') !== '') {
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try {
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$app->getValidator()->validate($server->getRequest());
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} catch (Throwable $e) {
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throw new RepositoryException('微信支付通知验签失败：' . $e->getMessage());
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}
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}
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try {
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$message = $server->getRequestMessage();
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} catch (Throwable $e) {
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throw new RepositoryException('微信支付通知解密失败：' . $e->getMessage());
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}
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$params = $message->toArray();
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Log::driver('pay')->info('微信支付通知解密', ['params' => $params]);
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return $params;
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}
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/**
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* 支付结果后台通知地址（统一下单时上送的 notify_url）
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*/
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public function notifyUrl(): string
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{
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return rtrim((string) config('app.url'), '/') . '/mini/payment/wechat-notify';
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}
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/**
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* 注入 EasyWeChat Application（测试 mock 用）
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*/
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public function setApplication(Application $application): static
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{
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$this->application = $application;
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return $this;
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}
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/**
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* EasyWeChat Pay Application（按当前配置懒加载构建）
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*
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* @throws RepositoryException 必填配置缺失或密钥无法解析
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*/
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public function app(): Application
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{
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if ($this->application !== null) {
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return $this->application;
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}
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$mchId = $this->config('mch_id');
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if ($mchId === '') {
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throw new RepositoryException('微信支付未配置商户号，请联系管理员');
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}
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$platformCerts = [];
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$platformCert = $this->config('platform_cert');
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$platformSerial = $this->config('platform_serial');
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if ($platformCert !== '' && $platformSerial !== '') {
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$platformCerts[$platformSerial] = $this->pemContent($platformCert, 'CERTIFICATE');
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}
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try {
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$this->application = new Application([
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'mch_id' => $mchId,
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'private_key' => $this->pemContent($this->config('private_key'), 'PRIVATE'),
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'certificate' => $this->pemContent($this->config('certificate'), 'CERTIFICATE'),
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'secret_key' => $this->config('secret_key'),
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'platform_certs' => $platformCerts,
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]);
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} catch (RepositoryException $e) {
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throw $e;
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} catch (Throwable $e) {
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throw new RepositoryException('微信支付配置错误：' . $e->getMessage());
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}
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return $this->application;
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}
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/**
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* 调起微信 v3 接口并处理应答（通讯/业务失败统一抛 RepositoryException）
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*
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* @param array<string, mixed> $payload POST 时为 JSON 报文，GET 时为 query 参数
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* @return array<string, mixed> 应答报文
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* @throws RepositoryException
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*/
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protected function call(string $method, string $uri, array $payload, string $action): array
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{
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try {
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$response = $method === 'GET'
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? $this->app()->getClient()->get($uri, ['query' => $payload])
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: $this->app()->getClient()->postJson($uri, $payload);
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} catch (RepositoryException $e) {
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throw $e;
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} catch (Throwable $e) {
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Log::driver('pay')->error('微信支付' . $action . '通讯异常', ['uri' => $uri, 'error' => $e->getMessage()]);
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throw new RepositoryException('微信支付' . $action . '通讯异常，请稍后重试');
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}
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$body = $response->getContent(false);
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Log::driver('pay')->info('微信支付' . $action . '应答', [
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'uri' => $uri,
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'status' => $response->getStatusCode(),
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'body' => $body,
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]);
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$result = json_decode($body, true);
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if ($response->isFailed()) {
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$message = is_array($result) ? (string) ($result['message'] ?? $result['code'] ?? '') : '';
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throw new RepositoryException('微信支付' . $action . '失败：' . ($message !== '' ? $message : '未知错误'));
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}
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return is_array($result) ? $result : [];
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}
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/**
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* 下单小程序 appid（默认取小程序自身 appid）
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*/
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protected function appid(): string
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{
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$appid = $this->config('appid');
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if ($appid === '') {
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$appid = (string) config('services.wechat.mini.appid', '');
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}
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return $appid;
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}
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/**
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* 密钥/证书内容归一化为 PEM：支持完整 PEM、base64 单行、file:// 路径或本地文件路径
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*
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* @throws RepositoryException 未配置
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*/
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protected function pemContent(string $value, string $kind): string
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{
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$value = trim($value);
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if ($value === '') {
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$name = $kind === 'PRIVATE' ? '商户API私钥' : '证书';
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throw new RepositoryException('微信支付未配置' . $name . '，请联系管理员');
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}
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if (str_starts_with($value, 'file://') || str_contains($value, '-----BEGIN')) {
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return $value;
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}
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if (is_file($value)) {
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return 'file://' . $value;
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}
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// base64 单行内容包装为 PEM
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$header = $kind === 'PRIVATE' ? 'PRIVATE' : 'CERTIFICATE';
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return "-----BEGIN {$header}-----\n" . wordwrap($value, 64, "\n", true) . "\n-----END {$header}-----";
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}
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/**
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* 读取支付配置：后台站点配置优先，为空回退 config/services.php（env）
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*/
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protected function config(string $key): string
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{
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$value = site_config('pay.wxpay_' . $key, '');
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if ($value === null || $value === '') {
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$value = config('services.wxpay.' . $key, '');
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}
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return trim((string) $value);
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}
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}
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