feat: added useZopfliForGzip option

Closes #39

.travis.yml

@@ -10,23 +10,3 @@ cache:
 before_cache: rm -rf node_modules/.cache
 install: npm install --build-from-source
 after_success: cat ./coverage/lcov.info | coveralls
-
-#stages:
-#- test
-##- name: Deploy
-##  if: tag IS present
-
-#jobs:
-#  include:
-#  - stage: Deploy
-#    node_js: stable
-#    script: node ./prepublish.js
-#    after_success: false
-##    deploy:
-##    - provider: npm
-##      skip_cleanup: true
-##      on:
-##        tags: true
-##      email: [email protected]
-##      api_key:
-##        secure: iSr5sIvDsSP3c+55Wa91G3a3WXkb8Eb9iGc6wontJDZQx7PZ+xYHFFYEAQkK6LYw08i0eik/2xTdt76djb1jySOi/OlvAQIGsf/GPcTG0qRcRvW/rR6CM7yX36xQ9pWUn/PEuDHSmzBnKVHHrhbYR66olUrOBu7GcgTJoLDj0ppFSbtUMqqFCM8bNQs8d3gMgwF96+7jpzjHbFDVrB+jMN8qNZF29RO+Xqv9oaPSQyY2o7IJUwsbVGUs6g6EpnNlj4p7MfzBmhoNLikY73UtW2teLyobDTf8Qv0+PwuRq1WwB8UhlgSlqQ+TWaFcywqmhiZIm30fu69M1qfkuO6N51jIuvq19qCZekcl02vS5kUs0VnbOozp+5BuQNdEzkbmrQrtDkGXaI86ZVr7MUGfFZqPQlEcIoOQyRT6cA8BtZ4SrhCS73xLbFoHcLhbXR7i3gpNQK1Ap5YMnlwQS+z4e5NI6h/VQ+8GRXuVCTclAuJdpXkJWGuoOMfLK0keCkO1iqETW4Iv7t58tjJXiwfU8VBgxd/8bI5lyVoy9VpBoptaDjfWJpfaSskXjxTv+RVVmwhjr44wngvvNid93q0hB7+AFhr4kR52fQ8vXtZtfM3fdTUy036IUo/omQzXKV7EyL/QFkI62a4EDJAFWpuZOO+wtlCaijbcadTrtIV5wJk=

README.md

@@ -46,6 +46,7 @@ project.
 - [API](#api)
   - [`shrinkRay([options])`](#shrinkrayoptions)
     - [Options](#options)
+      - [useZopfliForGzip](#usezopfliforgzip)
       - [filter](#filter)
       - [cache](#cache)
       - [cacheSize](#cachesize)
@@ -129,6 +130,11 @@ we have also moved all of the gzip/deflate/zlib-specific parameters
 into a sub-object called `zlib`. If you use `zlib` parameters at the root level
 of options in `shrink-ray`, you will get a deprecation warning.
 
+#### useZopfliForGzip
+
+Whether to use [node-zopfli-es](https://www.npmjs.com/package/node-zopfli-es) (`true`) or zlib (`false`) for gzip compression.
+Defaults to `true`.
+
 #### filter
 
 A function to decide if the response should be considered for compression.

brotli-compat.js

@@ -1,6 +1,4 @@
-module.exports = getBrotliModule;
-
-function getBrotliModule() {
+module.exports = function brotliCompat() {
   const zlib = require('zlib');
 
   if (typeof zlib.createBrotliCompress === 'function') {
@@ -12,8 +10,8 @@ function getBrotliModule() {
       quality: zlib.constants.BROTLI_PARAM_QUALITY,
       lgwin: zlib.constants.BROTLI_PARAM_LGWIN,
       lgblock: zlib.constants.BROTLI_PARAM_LGBLOCK,
-      disable_literal_context_modeling:  
-        zlib.constants.BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING,
+      disable_literal_context_modeling:
+      zlib.constants.BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING,
       large_window: zlib.constants.BROTLI_PARAM_LARGE_WINDOW
     };
     const iltorbOptionsToNodeZlibBrotliOpts = iltorbOpts => {
@@ -23,11 +21,11 @@ function getBrotliModule() {
         if (ILTORB_OPTION_NAMES_TO_BROTLI_PARAM_NAMES.hasOwnProperty(key)) {
           params[ILTORB_OPTION_NAMES_TO_BROTLI_PARAM_NAMES[key]] = iltorbOpts[
             key
-          ];
+            ];
         }
       });
       return { params };
-    }
+    };
 
     /**
      * Replicate the 'iltorb' interface for backwards compatibility.
@@ -42,7 +40,7 @@ function getBrotliModule() {
     };
 
   }
-  
+
   // If we get here, then our NodeJS does not support brotli natively.
   try {
     return require('iltorb');
@@ -55,8 +53,8 @@ function getBrotliModule() {
       }
     );
   }
-  
+
   // Return a signal value instead of throwing an exception, so the code in the
   // index file doesn't have to try/catch again.
   return false;
-}
+};

index.js

@@ -2,6 +2,7 @@
 
 /*!
  * compression
+ * Copyright(c) 2019 CodeIter (https://github.com/CodeIter)
  * Copyright(c) 2017 Arturas Molcanovas
  * Copyright(c) 2010 Sencha Inc.
  * Copyright(c) 2011 TJ Holowaychuk
@@ -28,19 +29,18 @@ const zlib         = require('zlib');
  * Optional dependencies handling. If some binary dependencies cannot build in
  * this environment, or are incompatible with this version of Node, the rest of
  * the module should work!
- * Known dependency issues: 
+ * Known dependency issues:
  *  - node-zopfli-es is not compatible with Node <8.11.
  *  - iltorb is not required for Node >= 11.8, whose zlib has brotli built in.
  */
 
- const brotliCompat = require('./brotli-compat');
- const zopfliCompat = require('./zopfli-compat');
-
- // These are factory functions because they dynamically require dependencies
- // and may log errors.
- // They need to be tested, so they shouldn't have side effects on load.
- const brotli = brotliCompat();
- const zopfli = zopfliCompat();
+const brotliCompat = require('./brotli-compat');
+const zopfliCompat = require('./zopfli-compat');
+
+// These are factory functions because they dynamically require dependencies
+// and may log errors.
+// They need to be tested, so they shouldn't have side effects on load.
+const brotli = brotliCompat();
 
 /**
  * Module exports.
@@ -76,6 +76,7 @@ function compression(options) {
   const opts = options || {};
 
   // options
+  const zopfli = zopfliCompat('useZopfliForGzip' in opts ? opts.useZopfliForGzip : true);
   const filter  = opts.filter || shouldCompress;
   let threshold = bytes.parse(opts.threshold);
 
@@ -93,7 +94,7 @@ function compression(options) {
   });
 
   if (!opts.hasOwnProperty('cacheSize')) opts.cacheSize = '128mB';
-  const cache = opts.cacheSize ? createCache(bytes(opts.cacheSize.toString())) : null;
+  const cache = opts.cacheSize ? createCache(bytes(opts.cacheSize.toString()), zopfli) : null;
 
   const shouldCache = opts.cache || stubTrue;
 
@@ -359,7 +360,7 @@ function shouldTransform(req, res) {
          !cacheControlNoTransformRegExp.test(cacheControl);
 }
 
-function createCache(size) {
+function createCache(size, zopfli) {
   const index = {};
   const lru   = new lruCache({
                            max:     size,
@@ -411,7 +412,7 @@ function createCache(size) {
       const result = new BufferWritable();
 
       new BufferReadable(buffer)
-        .pipe(getBestQualityReencoder(coding))
+        .pipe(getBestQualityReencoder(coding, zopfli))
         .pipe(result)
         .on('finish', function () {
           const itemInCache = lru.peek(key);
@@ -489,7 +490,7 @@ BufferDuplex.prototype._write = function (chunk, encoding, callback) {
 
 // get a decode --> encode transform stream that will re-encode the content at
 // the best quality available for that coding method.
-function getBestQualityReencoder(coding) {
+function getBestQualityReencoder(coding, zopfli) {
   switch (coding) {
     case 'gzip':
       return multipipe(zlib.createGunzip(), zopfli.createGzip());

package.json

@@ -1,9 +1,10 @@
 {
   "name": "shrink-ray-current",
   "description": "Node.js compression middleware with brotli and zopfli support",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "contributors": [
-    "Arturas Molcanovas <[email protected]> (https://alorel.github.io)",
+    "Arturas Molcanovas <[email protected]> (https://github.com/Alorel)",
+    "CodeIter (https://github.com/CodeIter)",
     "Douglas Christopher Wilson <[email protected]>",
     "Jonathan Ong <[email protected]> (http://jongleberry.com)",
     "Scott Davis (https://github.com/scttdavs)",