[FIX] 결제 redirect url 302 구현 (#79)

src/main/java/com/sumte/payment/controller/KakaoRedirectController.java

@@ -0,0 +1,97 @@
+package com.sumte.payment.controller;
+
+import com.sumte.apiPayload.ApiResponse;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import java.net.URI;
+
+@RestController
+@RequiredArgsConstructor
+@Slf4j
+@Tag(name = "결제 리다이렉트 API", description = "PG사 결제 후 앱으로 리다이렉트 처리")
+public class KakaoRedirectController {
+
+    @Value("${kakao.pay.android.scheme}")
+    private String scheme;
+
+    @Value("${kakao.pay.android.host}")
+    private String host;
+
+    @GetMapping("/pay/success")
+    @Operation(
+            summary = "결제 성공 리다이렉트",
+            description = "카카오페이 결제 성공 후 앱으로 리다이렉트합니다.<br>" +
+                    "Query Parameter로 paymentId, pg_token이 전달됩니다."
+    )
+    public ResponseEntity<ApiResponse<String>> success(
+            @RequestParam Long paymentId,
+            @RequestParam("pg_token") String pgToken) {
+
+        String deepLink = UriComponentsBuilder.newInstance()
+                .scheme(scheme).host(host).path("/success")
+                .queryParam("paymentId", paymentId)
+                .queryParam("pg_token", pgToken)
+                .build().toUriString();
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setLocation(URI.create(deepLink));
+        return ResponseEntity.status(HttpStatus.FOUND)
+                .headers(headers)
+                .body(ApiResponse.success(deepLink));
+    }
+
+    @GetMapping("/pay/cancel")
+    @Operation(
+            summary = "결제 취소 리다이렉트",
+            description = "카카오페이 결제 취소 후 앱으로 리다이렉트합니다.<br>" +
+                    "Query Parameter로 paymentId가 전달됩니다."
+    )
+    public ResponseEntity<ApiResponse<String>> cancel(@RequestParam Long paymentId) {
+        String deepLink = UriComponentsBuilder.newInstance()
+                .scheme(scheme).host(host).path("/cancel")
+                .queryParam("paymentId", paymentId)
+                .build().toUriString();
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setLocation(URI.create(deepLink));
+        return ResponseEntity.status(HttpStatus.FOUND)
+                .headers(headers)
+                .body(ApiResponse.success(deepLink));
+    }
+
+    @GetMapping("/pay/fail")
+    @Operation(
+            summary = "결제 실패 리다이렉트",
+            description = "카카오페이 결제 실패 후 앱으로 리다이렉트합니다.<br>" +
+                    "Query Parameter로 paymentId, code, message가 전달됩니다."
+    )
+    public ResponseEntity<ApiResponse<String>> fail(
+            @RequestParam Long paymentId,
+            @RequestParam(required=false) String code,
+            @RequestParam(required=false) String message) {
+
+        String deepLink = UriComponentsBuilder.newInstance()
+                .scheme(scheme).host(host).path("/fail")
+                .queryParam("paymentId", paymentId)
+                .queryParam("code", code)
+                .queryParam("message", message)
+                .build().toUriString();
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setLocation(URI.create(deepLink));
+        return ResponseEntity.status(HttpStatus.FOUND)
+                .headers(headers)
+                .body(ApiResponse.success(deepLink));
+    }
+}

src/main/java/com/sumte/payment/service/PaymentServiceImpl.java

@@ -52,9 +52,9 @@ public PaymentResponseDTO.PaymentReadyResponse requestPayment(PaymentRequestDTO.
                 .quantity("1")
                 .total_amount(String.valueOf(dto.getAmount()))
                 .tax_free_amount("0")
-                .approval_url(redirectDomain + "/pay/success")
-                .cancel_url(redirectDomain  + "/pay/cancel")
-                .fail_url(redirectDomain  + "/pay/fail")
+                .approval_url(redirectDomain + "/pay/success?paymentId=" + payment.getId())
+                .cancel_url(redirectDomain  + "/pay/cancel?paymentId=" + payment.getId())
+                .fail_url(redirectDomain    + "/pay/fail?paymentId=" + payment.getId())
                 .build();
 
         KakaoPayReadyResponseDTO kakaoResponse = kakaoPayClient.requestPayment(request);

src/main/resources/application-prod.yml

@@ -64,4 +64,7 @@ kakao:
   pay:
     secret-key: ${KAKAOPAY_SECRET_KEY}
     redirect:
-      domain: ${DOMAIN}
+      domain: ${DOMAIN}
+    android:
+      scheme : myapp
+      host : pay