diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 000000000..2e2e7d9c3
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,10 @@
+build_and_deploy:
+    stage: build
+    script:
+        - npm install
+        - npm run build
+        - git log --oneline --decorate > ./build/_h5ai/CHANGELOG.txt
+        - cd ./build/
+        - rm h5ai-*.zip
+        - scp -r . root@dose.rsc.lan:/var/www/
+    environment: staging
\ No newline at end of file
diff --git a/src/_h5ai/private/conf/options.json b/src/_h5ai/private/conf/options.json
index 1ec53edc0..6c9af0755 100644
--- a/src/_h5ai/private/conf/options.json
+++ b/src/_h5ai/private/conf/options.json
@@ -181,7 +181,7 @@
     */
     "info": {
         "enabled": true,
-        "show": false,
+        "show": true,
         "qrcode": true,
         "qrFill": "#999",
         "qrBack": "#fff"
@@ -323,6 +323,14 @@
         "checkboxes": true
     },
 
+    /*
+    Calc the SHA-1 checksum of files.
+    This operation is real slow for large files.
+    */
+    "sha1": {
+        "enabled": true
+    },
+
     /*
     Default sort order.
     "column" and "reverse" are locally stored.
diff --git a/src/_h5ai/private/php/core/class-item.php b/src/_h5ai/private/php/core/class-item.php
index 2b9ce3486..a52c091b3 100644
--- a/src/_h5ai/private/php/core/class-item.php
+++ b/src/_h5ai/private/php/core/class-item.php
@@ -34,6 +34,7 @@ public static function get($context, $path, &$cache) {
     public $href;
     public $date;
     public $size;
+    public $sha1;
     public $is_folder;
     public $is_content_fetched;
 
@@ -45,6 +46,7 @@ private function __construct($context, $path) {
         $this->href = $context->to_href($this->path, $this->is_folder);
         $this->date = @filemtime($this->path);
         $this->size = Util::filesize($context, $this->path);
+        $this->sha1 = Util::sha1($context, $this->path);
         $this->is_content_fetched = false;
     }
 
@@ -52,7 +54,8 @@ public function to_json_object() {
         $obj = [
             'href' => $this->href,
             'time' => $this->date * 1000, // seconds (PHP) to milliseconds (JavaScript)
-            'size' => $this->size
+            'size' => $this->size,
+            'sha1' => $this->sha1
         ];
 
         if ($this->is_folder) {
diff --git a/src/_h5ai/private/php/core/class-sha1.php b/src/_h5ai/private/php/core/class-sha1.php
new file mode 100644
index 000000000..3b3019a1b
--- /dev/null
+++ b/src/_h5ai/private/php/core/class-sha1.php
@@ -0,0 +1,34 @@
+<?php
+
+class SHA1 {
+    private static $cache = [];
+
+    public static function getHash($path) {
+        $sha1 = new SHA1();
+        return $sha1->hash($path);
+    }
+
+    public static function getCachedHash($path, $clear_cache = false) {
+        if (array_key_exists($path, SHA1::$cache) && !$clear_cache) {
+            return SHA1::$cache[$path];
+        }
+
+        $hash = SHA1::getHash($path, $clear_cache);
+
+        SHA1::$cache[$path] = $hash;
+        return $hash;
+    }
+
+
+    private function __construct() {
+
+    }
+
+    private function hash($path) {
+        if (is_file($path)) {
+            return sha1_file($path);
+        }
+
+        return null;
+    }
+}
diff --git a/src/_h5ai/private/php/core/class-util.php b/src/_h5ai/private/php/core/class-util.php
index ce6c80295..ae4f11581 100644
--- a/src/_h5ai/private/php/core/class-util.php
+++ b/src/_h5ai/private/php/core/class-util.php
@@ -86,4 +86,13 @@ public static function filesize($context, $path) {
         $withDu = $context->get_setup()->get('HAS_CMD_DU') && $context->query_option('foldersize.type', null) === 'shell-du';
         return Filesize::getCachedSize($path, $withFoldersize, $withDu);
     }
+
+    public static function sha1($context, $path, $clear_cache = false) {
+        $sha1Enabled = $context->query_option('sha1.enabled', false);
+        if($sha1Enabled) {
+    	   return SHA1::getCachedHash($path, $clear_cache);
+        } else {
+            return null;
+        }
+    }
 }
diff --git a/src/_h5ai/public/css/lib/ext/info.less b/src/_h5ai/public/css/lib/ext/info.less
index cc8d7e56d..8ed167417 100644
--- a/src/_h5ai/public/css/lib/ext/info.less
+++ b/src/_h5ai/public/css/lib/ext/info.less
@@ -3,13 +3,12 @@
     flex: 0 0 auto;
     order: 99;
 
-    padding: 32px 32px 32px 48px;
+    padding: 32px;
     white-space: nowrap;
     overflow-x: hidden;
-    width: 240px;
+    width: 320px;
 
     .icon {
-        width: 240px;
         height: 180px;
 
         img {
diff --git a/src/_h5ai/public/js/lib/ext/info.js b/src/_h5ai/public/js/lib/ext/info.js
index 85f9b0f35..b5527bb22 100644
--- a/src/_h5ai/public/js/lib/ext/info.js
+++ b/src/_h5ai/public/js/lib/ext/info.js
@@ -20,6 +20,7 @@ const tpl =
                 <div class="label"></div>
                 <div class="time"></div>
                 <div class="size"></div>
+                <div class="sha1"></div>
                 <div class="content">
                     <span class="folders"></span> <span class="l10n-folders"></span>,
                     <span class="files"></span> <span class="l10n-files"></span>
@@ -39,6 +40,7 @@ let $img;
 let $label;
 let $time;
 let $size;
+let $sha1;
 let $content;
 let $folders;
 let $files;
@@ -85,6 +87,13 @@ const update = item => {
         $size.hide();
     }
 
+    if(item.sha1) {
+        $sha1.text(item.sha1 + ' (SHA-1)');
+        $sha1.show();
+    } else {
+        $sha1.hide();
+    }
+
     if (item.isContentFetched) {
         const stats = item.getStats();
         $folders.text(stats.folders);
@@ -131,6 +140,7 @@ const init = () => {
     $label = $info.find('.label');
     $time = $info.find('.time');
     $size = $info.find('.size');
+    $sha1 = $info.find('.sha1');
     $content = $info.find('.content');
     $folders = $info.find('.folders');
     $files = $info.find('.files');
diff --git a/src/_h5ai/public/js/lib/model/item.js b/src/_h5ai/public/js/lib/model/item.js
index 3d725b16c..a0491cd23 100644
--- a/src/_h5ai/public/js/lib/model/item.js
+++ b/src/_h5ai/public/js/lib/model/item.js
@@ -64,6 +64,11 @@ const getItem = options => {
     if (isNum(options.size)) {
         item.size = options.size;
     }
+    
+    if(options.sha1) {
+        item.sha1 = options.sha1;
+    }
+
     if (options.managed) {
         item.isManaged = true;
     }
@@ -120,6 +125,7 @@ const Item = absHref => {
         label: createLabel(absHref === '/' ? location.getDomain() : split.name),
         time: null,
         size: null,
+        sha1: null,
         parent: null,
         isManaged: null,
         content: {}