Created
May 24, 2020 18:58
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lambda@edge function handle 404,403 response from s3 origin
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| 'use strict'; | |
| const http = require('https'); | |
| const indexPage = 'index.html'; | |
| exports.handler = async (event, context, callback) => { | |
| const cf = event.Records[0].cf; | |
| const request = cf.request; | |
| const response = cf.response; | |
| const statusCode = response.status; | |
| // Only replace 403 and 404 requests typically received | |
| // when loading a page for a SPA that uses client-side routing | |
| const doReplace = request.method === 'GET' | |
| && (statusCode == '403' || statusCode == '404'); | |
| if (doReplace){ | |
| let appPath = getAppPath(request.uri); | |
| let appPathLower = appPath.toLowerCase(); | |
| if (appPath && appPathLower != 'api')){ | |
| response.status = '301'; | |
| response.statusDescription = 'Found'; | |
| response.body = ''; | |
| let redirect_path = "/index.html"; | |
| if (appPathLower == 'admin' || appPathLower == 'reports'){ | |
| redirect_path = "/"+appPath+"/index.html"; | |
| } | |
| if (! response.headers){ | |
| response.headers = {}; | |
| } | |
| response.headers['location'] = [{ key: 'Location', value: redirect_path }]; | |
| } | |
| } | |
| callback(null, response); | |
| }; | |
| // Get the app path segment | |
| function getAppPath(path){ | |
| if(!path){ | |
| return ''; | |
| } | |
| if(path[0] === '/'){ | |
| path = path.slice(1); | |
| } | |
| const segments = path.split('/'); | |
| return segments[0]; | |
| } |
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