From 673ba0176a31c9052810f227be6731e087ebd3cf Mon Sep 17 00:00:00 2001
From: Gyubin-Han <yangglei2@naver.com>
Date: Tue, 17 Jun 2025 16:04:09 +0900
Subject: [PATCH] =?UTF-8?q?Feat:=20=EB=8B=A8=EC=B6=95=20URL=EB=A1=9C=20?=
 =?UTF-8?q?=EC=9B=90=EB=B3=B8=20URL=20=EC=A1=B0=ED=9A=8C=20=EA=B8=B0?=
 =?UTF-8?q?=EB=8A=A5=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../exception/ShortUrlNotFoundException.java        |  6 ++++++
 .../urlShortener/repository/UrlMapRepository.java   |  6 ++++--
 .../be/gyu/urlShortener/service/MainService.java    | 13 +++++++++++++
 3 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/be/gyu/urlShortener/exception/ShortUrlNotFoundException.java

diff --git a/src/main/java/be/gyu/urlShortener/exception/ShortUrlNotFoundException.java b/src/main/java/be/gyu/urlShortener/exception/ShortUrlNotFoundException.java
new file mode 100644
index 0000000..b5bd276
--- /dev/null
+++ b/src/main/java/be/gyu/urlShortener/exception/ShortUrlNotFoundException.java
@@ -0,0 +1,6 @@
+package be.gyu.urlShortener.exception;
+
+public class ShortUrlNotFoundException extends RuntimeException{
+    public ShortUrlNotFoundException(){ super("존재하지 않는 단축 URL 입니다."); }
+    public ShortUrlNotFoundException(String msg){ super(msg); }
+}
diff --git a/src/main/java/be/gyu/urlShortener/repository/UrlMapRepository.java b/src/main/java/be/gyu/urlShortener/repository/UrlMapRepository.java
index 3a9f2d4..c741119 100644
--- a/src/main/java/be/gyu/urlShortener/repository/UrlMapRepository.java
+++ b/src/main/java/be/gyu/urlShortener/repository/UrlMapRepository.java
@@ -1,9 +1,11 @@
 package be.gyu.urlShortener.repository;
 
+import java.util.Optional;
+
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import be.gyu.urlShortener.entity.UrlMap;
 
 public interface UrlMapRepository extends JpaRepository<UrlMap,Integer> {
-    
-}
+    public Optional<UrlMap> findByUrlMapShort(String urlMapShort);
+}
\ No newline at end of file
diff --git a/src/main/java/be/gyu/urlShortener/service/MainService.java b/src/main/java/be/gyu/urlShortener/service/MainService.java
index b574d81..72b9b40 100644
--- a/src/main/java/be/gyu/urlShortener/service/MainService.java
+++ b/src/main/java/be/gyu/urlShortener/service/MainService.java
@@ -4,8 +4,10 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import be.gyu.urlShortener.entity.UrlMap;
+import be.gyu.urlShortener.exception.ShortUrlNotFoundException;
 import be.gyu.urlShortener.repository.UrlMapRepository;
 
+import java.util.Optional;
 import java.time.LocalDateTime;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -79,4 +81,15 @@ public class MainService {
         // 단축된 URL 반환
         return shortResult;
     }
+
+    // 단축 URL로 원본 URL 조회 및 반환 메소드
+    public String getOriginalUrl(String shortUrl){
+        Optional<UrlMap> optional=urlMapRepository.findByUrlMapShort(shortUrl);
+        
+        if(!optional.isPresent()){
+            throw new ShortUrlNotFoundException();
+        }
+
+        return optional.get().getUrlMapOriginal();
+    }
 }