feat: 람다 코드 추가

.gitignore

@@ -4,4 +4,3 @@ dist/
 tmp/
 .idea/
 .env
-lambda/

lambda/index.mjs

@@ -0,0 +1,50 @@
+import axios from 'axios';
+const PREFIX_URL = "https://www.googleapis.com/youtube/v3/commentThreads?part=snippet&key=";
+const COUNT = 3;
+
+async function getYoutubeComment(videoId) {
+  const url = PREFIX_URL + process.env.API_KEY + "&videoId=" + videoId + "&maxResults=100";
+  let { data } = await axios.get(url);
+  if(!data) {
+    return [];
+  }
+  let i = 1;
+  const ret = data.items.map((ele) => ele.snippet.topLevelComment.snippet);
+  while (data.nextPageToken && i < COUNT) {
+    const res = await axios.get(url + "&pageToken=" + data.nextPageToken);
+    data = res.data;
+    data.items.forEach((ele) => ret.push(ele.snippet.topLevelComment.snippet));
+    i++;
+  }
+  return ret;
+}
+
+export const handler = async(event) => {
+  const {queryStringParameters} = event;
+  let ret = [];
+
+  if(!queryStringParameters) {
+    const response = {
+      statusCode: 200,
+      headers: {
+        "Access-Control-Allow-Headers" : "Content-Type",
+        "Access-Control-Allow-Origin": "https://www.youtube.com",
+        "Access-Control-Allow-Methods": "OPTIONS,GET"
+      },
+      body: JSON.stringify(ret),
+    };
+    return response;
+  }
+
+  ret = await getYoutubeComment(queryStringParameters.videoId);
+  const response = {
+    statusCode: 200,
+    headers: {
+      "Access-Control-Allow-Headers" : "Content-Type",
+      "Access-Control-Allow-Origin": "https://www.youtube.com",
+      "Access-Control-Allow-Methods": "OPTIONS,GET"
+    },
+    body: JSON.stringify(ret),
+  };
+  return response;
+};