[FIX] conflict resolve develop to main

functions/.gitignore

@@ -1,2 +1,3 @@
 node_modules/
-./package-lock.json
+./package-lock.json
+*.p8

functions/lib/appleAuth.js

@@ -0,0 +1,83 @@
+const axios = require('axios');
+const jwt = require('jsonwebtoken'); 
+const functions = require("firebase-functions");
+const slackAPI = require("../middlewares/slackAPI");
+const fs = require('fs').promises;
+const { resolve } = require('path');
+const qs = require('qs');
+
+const appleBaseURL = "https://appleid.apple.com";
+
+const getPrivateKey = async () => {
+    return (await fs.readFile(resolve(__dirname, `../${process.env.APPLE_PRIVATE_KEY_FILE}`), 'utf8')).toString();
+}
+
+const header = {
+    kid: process.env.APPLE_KEY_ID,
+};
+
+const payload = {
+    iss: process.env.APPLE_TEAM_ID,
+    iat: Math.floor(Date.now() / 1000),
+    exp: Math.floor(Date.now() / 1000) + 15777000,
+    aud: appleBaseURL,
+    sub: process.env.APPLE_CLIENT_ID,
+};
+
+/**
+ *  @desc apple 서버에 refresh token 요청
+ *  @param {String} appleCode
+ */
+const getAppleRefreshToken = async (appleCode) => {
+    const clientSecret = jwt.sign(payload, await getPrivateKey(), {
+        algorithm: 'ES256',
+        header
+    });
+
+    const data = {
+        'client_id': process.env.APPLE_CLIENT_ID,
+        'client_secret': clientSecret,
+        'code': appleCode,
+        'grant_type': 'authorization_code'
+    };
+
+    try {
+        const response = await axios.post(`${appleBaseURL}/auth/token`, qs.stringify(data));
+
+        return response.data.refresh_token;
+    } catch (error) {
+        functions.logger.error(`[ERROR] Get Apple Access Token` , `[CONTENT] ${error}`);
+        const slackMessage = `[ERROR] Get Apple Access Token ${JSON.stringify(error)}`;
+        slackAPI.sendMessageToSlack(slackMessage, slackAPI.WEB_HOOK_ERROR_MONITORING);
+        throw error;
+    } 
+}
+
+/**
+ * @desc apple 서버에 소셜 로그인 연결 해지 요청
+ * @param {String} appleRefreshToken
+ */
+const revokeAppleToken = async (appleRefreshToken) => {
+    const clientSecret = jwt.sign(payload, await getPrivateKey(), {
+        algorithm: 'ES256',
+        header
+    });
+
+    const data = {
+        'client_id': process.env.APPLE_CLIENT_ID,
+        'client_secret': clientSecret,
+        'token': appleRefreshToken,
+        'token_type_hint': 'refresh_token',
+    };
+
+    try {
+        await axios.post(`${appleBaseURL}/auth/revoke`, qs.stringify(data));
+    } catch (error) {
+        functions.logger.error(`[ERROR] Get Apple Access Token`, `[CONTENT] ${error}`);
+        const slackMessage = `[ERROR] Get Apple Access Token ${JSON.stringify(error)}`;
+        slackAPI.sendMessageToSlack(slackMessage, slackAPI.WEB_HOOK_ERROR_MONITORING);
+        throw error;
+    }
+}
+
+module.exports = { getAppleRefreshToken, revokeAppleToken }