Precompression for (pipelined) assets (nginx::gzip_static support).

system/blueprints/config/system.yaml

@@ -794,6 +794,27 @@ form:
                     validate:
                         type: bool
 
+                assets.precompress:
+                    type: toggle
+                    label: PLUGIN_ADMIN.PRECOMPRESS_ASSET
+                    help: PLUGIN_ADMIN.PRECOMPRESS_ASSET_HELP
+                    highlight: 0
+                    options:
+                        1: PLUGIN_ADMIN.YES
+                        0: PLUGIN_ADMIN.NO
+                    validate:
+                        type: bool
+
+                assets.precompress_level:
+                    type: text
+                    size: x-small
+                    label: PLUGIN_ADMIN.PRECOMPRESS_ASSET_LEVEL
+                    help: PLUGIN_ADMIN.PRECOMPRESS_ASSET_LEVEL_HELP
+                    validate:
+                        type: number
+                        min: 1
+                        max: 9
+
                 assets.enable_asset_timestamp:
                     type: toggle
                     label: PLUGIN_ADMIN.ENABLED_TIMESTAMPS_ON_ASSETS

system/config/system.yaml

@@ -102,6 +102,8 @@ assets:                                          # Configuration for Assets Mana
   js_pipeline_include_externals: true            # Include external URLs in the pipeline by default
   js_pipeline_before_excludes: true              # Render the pipeline before any excluded files
   js_minify: true                                # Minify the JS during pipelining
+  precompress: false                             # Precompress assets with GZip
+  precompress_level: 9                           # Compression level to use (1 = fastest, 9 = highest)
   enable_asset_timestamp: false                  # Enable asset timestamps
   collections:
     jquery: system://assets/jquery/jquery-2.x.min.js

system/src/Grav/Common/Assets.php

@@ -90,6 +90,10 @@ class Assets
     protected $css_no_pipeline = [];
     protected $js_no_pipeline = [];
 
+    // Default values for asset precompression.
+    protected $precompress = false;
+    protected $precompress_level = 9;
+
     /**
      * Assets constructor.
      *
@@ -170,6 +174,15 @@ public function config(array $config)
             $this->js_minify = $config['js_minify'];
         }
 
+        // Asset precompression
+        if (isset($config['precompress'])) {
+            $this->precompress = $config['precompress'];
+        }
+
+        if (isset($config['precompress_level'])) {
+            $this->precompress_level = $config['precompress_level'];
+        }
+
         // Set collections
         if (isset($config['collections']) && is_array($config['collections'])) {
             $this->collections = $config['collections'];
@@ -750,6 +763,10 @@ protected function pipelineCss($group = 'head', $returnURL = true)
         // Write non-pipeline files out
         if (!empty($this->css_no_pipeline)) {
             file_put_contents($this->assets_dir . $inline_file, json_encode($this->css_no_pipeline));
+
+            if ($this->precompress) {
+                $this->compressFile($this->assets_dir . $inline_file);
+            }
         }
 
 
@@ -774,6 +791,10 @@ protected function pipelineCss($group = 'head', $returnURL = true)
         if (strlen(trim($buffer)) > 0) {
             file_put_contents($this->assets_dir . $file, $buffer);
 
+            if ($this->precompress) {
+                $this->compressFile($this->assets_dir . $file);
+            }
+
             if ($returnURL) {
                 return $relative_path . $this->getTimestamp();
             }
@@ -843,6 +864,10 @@ protected function pipelineJs($group = 'head', $returnURL = true)
         // Write non-pipeline files out
         if (!empty($this->js_no_pipeline)) {
             file_put_contents($this->assets_dir . $inline_file, json_encode($this->js_no_pipeline));
+
+            if ($this->precompress) {
+                $this->compressFile($this->assets_dir . $inline_file);
+            }
         }
 
         // Concatenate files
@@ -857,6 +882,10 @@ protected function pipelineJs($group = 'head', $returnURL = true)
         if (strlen(trim($buffer)) > 0) {
             file_put_contents($this->assets_dir . $file, $buffer);
 
+            if ($this->precompress) {
+                $this->compressFile($this->assets_dir . $file);
+            }
+
             if ($returnURL) {
                 return $relative_path . $this->getTimestamp();
             }
@@ -868,6 +897,49 @@ protected function pipelineJs($group = 'head', $returnURL = true)
         }
     }
 
+    /**
+     * Compresses the given file.
+     *
+     * @param string $filename  File to compress
+     * @return bool             true if succesful, false if not.
+     */
+    protected function compressFile($filename = null)
+    {
+        // Test if we have gzencode()
+        if (!function_exists('gzencode')) {
+            return false;
+        }
+
+        // Test if $filename is set
+        if (!empty($filename)) {
+
+            // Test if the source file exists and can be read
+            if (!is_readable($filename)) {
+                return false;
+            }
+
+            // Test if we can write to the target file
+            $fp = fopen($filename . ".gz", "w");
+            if (!$fp) {
+                return false;
+            }
+
+            // Load source file, gzencode it, and write it out
+            $written = fwrite($fp, gzencode(file_get_contents($filename), $this->precompress_level));
+            fclose($fp);
+
+            if ($written === false) {
+                return false;
+            }
+
+            // Make the file modification time identical to that of the source file
+            touch($filename . ".gz", filemtime($filename));
+
+            return true;
+        }
+        return false;
+    }
+
     /**
      * Return the array of all the registered CSS assets
      * If a $key is provided, it will try to return only that asset