initial lambda@edge for content origin-request events

mdn · escattone · Sep 24, 2020 · Aug 6, 2020 · Aug 18, 2020 · Sep 22, 2020
commit 713e6cea1b2d0b5b02ed7a12560237182f66b43b
diff --git a/.gitignore b/.gitignore
@@ -68,3  68,4 @@ yarn-error.log*
 /deployer/src/deployer.egg-info/
 fake-v1-api/
 mdn-yari-*.tgz
 lambda/**/*.zip
diff --git a/content/utils.js b/content/utils.js
@@ -8,6  8,12 @@ function buildURL(locale, slug) {
   return `/${locale}/docs/${slug}`.toLowerCase();
 }
 
 /*
  * NOTE: A nearly identical copy of this function is used within
  *       ./lambda/content-origin-request/index.js. If you make a
  *       change to this function, you must replicate the change
  *       there as well.
  */
 function slugToFolder(slug) {
   return (
     slug

diff --git a/lambda/content-origin-request/index.js b/lambda/content-origin-request/index.js
@@ -0,0  1,50 @@
 const sanitizeFilename = require("sanitize-filename");
 
 const CONTENT_DEVELOPMENT_DOMAIN = ".content.dev.mdn.mozit.cloud";
 
 /*
  * NOTE: This function is derived from the function of the same name within
  *       ../../content/utils.js. It differs only in its final "join", which
  *       uses "/", as required by S3 keys, rather than "path.sep".
  */
 function slugToFolder(slug) {
   return slug
     .replace(/\*/g, "_star_")
     .replace(/::/g, "_doublecolon_")
     .replace(/:/g, "_colon_")
     .replace(/\?/g, "_question_")
     .toLowerCase()
     .split("/")
     .map(sanitizeFilename)
     .join("/");
 }
 
 exports.handler = async (event, context) => {
   /*
    * Modify the request before it's passed to the S3 origin.
    */
   const request = event.Records[0].cf.request;
   const host = request.headers.host[0].value.toLowerCase();
   // Rewrite the URI to match the keys in S3.
   // NOTE: The incoming URI should remain URI-encoded.
   let newURI = slugToFolder(request.uri);
   if (newURI.includes("/docs/") && !newURI.endsWith("/index.json")) {
     if (!newURI.endsWith("/")) {
       newURI  = "/";
     }
     newURI  = "index.html";
   }
   request.uri = newURI;
   // Rewrite the HOST header to match the S3 bucket website domain.
   // This is required only because we're using S3 as a website, which
   // we need in order to do redirects from S3. NOTE: The origin is
   // considered a "custom" origin because we're using S3 as a website.
   request.headers.host[0].value = request.origin.custom.domainName;
   // Conditionally rewrite the path (prefix) of the origin.
   if (host.endsWith(CONTENT_DEVELOPMENT_DOMAIN)) {
     // When reviewing PR's, each PR gets its own subdomain, and
     // all of its content is prefixed with that subdomain in S3.
     request.origin.custom.path = `/${host.split(".")[0]}`;
   }
   return request;
 };
diff --git a/lambda/content-origin-request/package.json b/lambda/content-origin-request/package.json
@@ -0,0  1,14 @@
 {
   "name": "content-origin-request-handler",
   "version": "1.0.0",
   "description": "For creating the AWS Lambda deployment package for the Lambda@Edge content-origin-request handler.",
   "private": true,
   "main": "index.js",
   "license": "MPL-2.0",
   "scripts": {
     "make-zip": "yarn install && zip -r mdn-content-origin-request.zip ."
   },
   "dependencies": {
     "sanitize-filename": "^1.6.3"
   }
 }
diff --git a/lambda/content-origin-request/yarn.lock b/lambda/content-origin-request/yarn.lock
@@ -0,0  1,22 @@
 # THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
 # yarn lockfile v1
 
 
 sanitize-filename@^1.6.3:
   version "1.6.3"
   resolved "https://registry.yarnpkg.com/sanitize-filename/-/sanitize-filename-1.6.3.tgz#755ebd752045931977e30b2025d340d7c9090378"
   integrity sha512-y/52Mcy7aw3gRm7IrcGDFx/bCk4AhRh2eI9luHOQM86nZsqwiRkkq2GekHXBBD SmPidc8i2PqtYZl pWJ8Oeg==
   dependencies:
     truncate-utf8-bytes "^1.0.0"
 
 truncate-utf8-bytes@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/truncate-utf8-bytes/-/truncate-utf8-bytes-1.0.2.tgz#405923909592d56f78a5818434b0b78489ca5f2b"
   integrity sha1-QFkjkJWS1W94pYGENLC3hInKXys=
   dependencies:
     utf8-byte-length "^1.0.1"
 
 utf8-byte-length@^1.0.1:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/utf8-byte-length/-/utf8-byte-length-1.0.4.tgz#f45f150c4c66eee968186505ab93fcbb8ad6bf61"
   integrity sha1-9F8VDExm7uloGGUFq5P8u4rWv2E=