콘텐츠 API 추가

src/main/kotlin/kr/co/vividnext/sodalive/aws/cloudfront/AudioContentCloudFront.kt

@@ -0,0 +1,48 @@
+package kr.co.vividnext.sodalive.aws.cloudfront
+
+import com.amazonaws.services.cloudfront.CloudFrontUrlSigner
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.stereotype.Component
+import java.nio.file.Files
+import java.nio.file.Paths
+import java.security.KeyFactory
+import java.security.PrivateKey
+import java.security.spec.PKCS8EncodedKeySpec
+import java.util.Date
+
+@Component
+class AudioContentCloudFront(
+    @Value("\${cloud.aws.content-cloud-front.host}")
+    private val cloudfrontDomain: String,
+
+    @Value("\${cloud.aws.content-cloud-front.private-key-file-path}")
+    private val privateKeyFilePath: String,
+
+    @Value("\${cloud.aws.content-cloud-front.key-pair-id}")
+    private val keyPairId: String
+) {
+    fun generateSignedURL(
+        resourcePath: String,
+        expirationTime: Long
+    ): String {
+        // Load private key from file
+        val privateKey = loadPrivateKey(privateKeyFilePath)
+
+        // Generate signed URL for resource with custom policy and expiration time
+
+        return CloudFrontUrlSigner.getSignedURLWithCannedPolicy(
+            "https://$cloudfrontDomain/$resourcePath", // Resource URL
+            keyPairId, // CloudFront key pair ID
+            privateKey, // CloudFront private key
+            Date(System.currentTimeMillis() + expirationTime) // Expiration date
+        )
+    }
+
+    private fun loadPrivateKey(resourceName: String): PrivateKey {
+        val path = Paths.get(resourceName)
+        val bytes = Files.readAllBytes(path)
+        val keySpec = PKCS8EncodedKeySpec(bytes)
+        val keyFactory = KeyFactory.getInstance("RSA")
+        return keyFactory.generatePrivate(keySpec)
+    }
+}