From 39e2b429957e605ed2caf6d4d3909647a38728f7 Mon Sep 17 00:00:00 2001
From: "hehihoho3@gmail.com" <hehihoho3@gmail.com>
Date: Mon, 29 Jun 2026 17:04:15 +0900
Subject: [PATCH] =?UTF-8?q?feat(comment-cards):=20=EC=9C=A0=ED=8A=9C?=
 =?UTF-8?q?=EB=B8=8C=20videoId=20=ED=8C=8C=EC=84=9C=20=EC=B6=94=EA=B0=80?=
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watch/youtu.be/shorts/embed/순수ID 추출, 단위 테스트 포함

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 .../service/YoutubeVideoIdParser.java         | 30 +++++++++++++
 .../service/YoutubeVideoIdParserTest.java     | 43 +++++++++++++++++++
 2 files changed, 73 insertions(+)
 create mode 100644 src/main/java/com/hlab/yanalyst/service/YoutubeVideoIdParser.java
 create mode 100644 src/test/java/com/hlab/yanalyst/service/YoutubeVideoIdParserTest.java

diff --git a/src/main/java/com/hlab/yanalyst/service/YoutubeVideoIdParser.java b/src/main/java/com/hlab/yanalyst/service/YoutubeVideoIdParser.java
new file mode 100644
index 0000000..d6819cc
--- /dev/null
+++ b/src/main/java/com/hlab/yanalyst/service/YoutubeVideoIdParser.java
@@ -0,0 +1,30 @@
+package com.hlab.yanalyst.service;
+
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+/** 유튜브 URL 또는 11자리 영상 ID에서 videoId를 추출한다. 실패 시 null. */
+public final class YoutubeVideoIdParser {
+
+    private static final Pattern BARE = Pattern.compile("^[A-Za-z0-9_-]{11}$");
+    private static final Pattern[] PATTERNS = {
+        Pattern.compile("[?&]v=([A-Za-z0-9_-]{11})"),
+        Pattern.compile("youtu\\.be/([A-Za-z0-9_-]{11})"),
+        Pattern.compile("/shorts/([A-Za-z0-9_-]{11})"),
+        Pattern.compile("/embed/([A-Za-z0-9_-]{11})"),
+    };
+
+    private YoutubeVideoIdParser() {}
+
+    public static String parse(String input) {
+        if (input == null) return null;
+        String s = input.trim();
+        if (s.isEmpty()) return null;
+        if (BARE.matcher(s).matches()) return s;
+        for (Pattern p : PATTERNS) {
+            Matcher m = p.matcher(s);
+            if (m.find()) return m.group(1);
+        }
+        return null;
+    }
+}
diff --git a/src/test/java/com/hlab/yanalyst/service/YoutubeVideoIdParserTest.java b/src/test/java/com/hlab/yanalyst/service/YoutubeVideoIdParserTest.java
new file mode 100644
index 0000000..cbaf2c7
--- /dev/null
+++ b/src/test/java/com/hlab/yanalyst/service/YoutubeVideoIdParserTest.java
@@ -0,0 +1,43 @@
+package com.hlab.yanalyst.service;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class YoutubeVideoIdParserTest {
+
+    @Test
+    void parsesWatchUrl() {
+        assertEquals("dQw4w9WgXcQ",
+            YoutubeVideoIdParser.parse("https://www.youtube.com/watch?v=dQw4w9WgXcQ"));
+    }
+
+    @Test
+    void parsesWatchUrlWithExtraParams() {
+        assertEquals("dQw4w9WgXcQ",
+            YoutubeVideoIdParser.parse("https://www.youtube.com/watch?v=dQw4w9WgXcQ&t=42s&list=ABC"));
+    }
+
+    @Test
+    void parsesShortLink() {
+        assertEquals("dQw4w9WgXcQ",
+            YoutubeVideoIdParser.parse("https://youtu.be/dQw4w9WgXcQ?si=xyz"));
+    }
+
+    @Test
+    void parsesShortsLink() {
+        assertEquals("abc12345678",
+            YoutubeVideoIdParser.parse("https://www.youtube.com/shorts/abc12345678"));
+    }
+
+    @Test
+    void parsesBareId() {
+        assertEquals("dQw4w9WgXcQ", YoutubeVideoIdParser.parse("dQw4w9WgXcQ"));
+    }
+
+    @Test
+    void returnsNullForGarbage() {
+        assertNull(YoutubeVideoIdParser.parse("not a youtube link"));
+        assertNull(YoutubeVideoIdParser.parse(""));
+        assertNull(YoutubeVideoIdParser.parse(null));
+    }
+}