Start of signer

mod/provider/cloudfront.js

@@ -3,17 +3,13 @@
 
 The cloudfront provider module exports a method to fetch resources from an AWS cloudfront service.
 
-@requires fs
-@requires path
 @requires module:/utils/logger
-@requires @aws-sdk/cloudfront-signer
+@requires module:/sign/cloudfront
 
 @module /provider/cloudfront
 */
 
-const { readFileSync } = require('fs')
-const { join } = require('path')
-const { getSignedUrl } = require('@aws-sdk/cloudfront-signer');
+const cloudfront_signer = require('../sign/cloudfront');
 const logger = require('../utils/logger')
 
 /**
@@ -41,20 +37,7 @@ module.exports = async function cloudfront(ref) {
 
   try {
 
-    // Substitutes {*} with process.env.SRC_* key values.
-    const url = (ref.params?.url || ref).replace(/{(?!{)(.*?)}/g,
-      matched => process.env[`SRC_${matched.replace(/(^{)|(}$)/g, '')}`])
-
-    const date = new Date(Date.now())
-
-    date.setDate(date.getDate() + 1);
-
-    const signedURL = getSignedUrl({
-      url: `https://${url}`,
-      keyPairId: process.env.KEY_CLOUDFRONT,
-      dateLessThan: date.toDateString(),
-      privateKey: String(readFileSync(join(__dirname, `../../${process.env.KEY_CLOUDFRONT}.pem`)))
-    });
+    const signedURL = JSON.parse(cloudfront_signer(ref))
 
     // Return signedURL only from request.
     if (ref.params?.signedURL) {

mod/sign/_sign.js

@@ -9,12 +9,14 @@ The sign API provides access to different request signer modules. Signer modules
 @module /sign
 */
 
+const cloudfront = require('./cloudfront')
 const cloudinary = require('./cloudinary')
 const s3 = require('./s3')
 
 const signerModules = {
   cloudinary,
-  s3
+  s3,
+  cloudfront
 }
 
 /**

mod/sign/cloudfront.js

@@ -0,0 +1,83 @@
+/**
+## /sign/cloudfront
+
+The cloudfront sign module exports a method to sign requests to an AWS cloudfront service.
+
+@requires fs
+@requires path
+@requires aws-sdk/cloudfront-signer
+
+@module /sign/cloudfront
+*/
+
+
+let getSignedUrl;
+
+if(!process.env.KEY_CLOUDFRONT){
+
+    console.log('Cloudfront Sign: Missing credentials from env: KEY_CLOUDFRONT')
+    module.exports = null
+
+}
+else{
+
+    //Third party sources are optional
+    try{
+
+        getSignedUrl = require('@aws-sdk/cloudfront-signer');
+        module.exports = cloudfront_signer
+
+    }catch(err){
+
+        if(err.code === 'MODULE_NOT_FOUND'){
+
+            console.log('AWS_SDK/Cloudfront-Signer is not available')
+            module.exports = null
+        }
+
+        else throw err
+    }
+}
+
+const { readFileSync } = require('fs')
+const { join } = require('path')
+
+/**
+@function cloudfront_signer
+@async
+
+@description
+The method creates a signed URL for a cloudfront resource.
+
+@param {Object|String} req Reference object or URL string.
+@property {Object} [req.params] Optional parameters for the request.
+@property {string} [params.url] Cloudfront resource URL.
+
+@returns {Promise<String>} The method resolves to a string which contains the signed url.
+*/
+async function cloudfront_signer(req) {
+
+  try {
+
+    // Substitutes {*} with process.env.SRC_* key values.
+    const url = (req.params?.url || req).replace(/{(?!{)(.*?)}/g,
+      matched => process.env[`SRC_${matched.replace(/(^{)|(}$)/g, '')}`])
+
+    const date = new Date(Date.now())
+
+    date.setDate(date.getDate() + 1);
+
+    const signedURL = getSignedUrl({
+      url: `https://${url}`,
+      keyPairId: process.env.KEY_CLOUDFRONT,
+      dateLessThan: date.toDateString(),
+      privateKey: String(readFileSync(join(__dirname, `../../${process.env.KEY_CLOUDFRONT}.pem`)))
+    });
+
+    // Return signedURL only from request.
+    return JSON.stringify(signedURL)
+  }
+  catch(err){
+    console.error(err)
+  }
+}