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site/OFF_plugins/kirby-zipdownload/kirby-zipdownload.php

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+<?php
+// -------------------------------------------
+// kirby plugin
+// Title:  ZipDownload
+// function: This plugin provides basic capacity to select & download multiple image files as a zip.
+
+// copyright: 2016 Joachim Robert <joachim.robert@gmail.com>
+// license: https://creativecommons.org/licenses/by-sa/3.0/ CC BY-SA 3.0
+
+// usage:
+// see README.md
+
+// version: 0.1 (14.08.2016)
+// changelog:
+//  O.1 : initial release. Nothing much to see yet.
+// -------------------------------------------
+
+
+# This, you can change :
+
+# No File Selected error message
+function zipdl_errormessage_noFileSelected() {
+  # TODO : add support for multilang
+  echo "Error : no file was selected :(";
+}
+
+
+# Until the end of the file, you might not want to change :
+
+function zipdl_dl_url() {
+  echo kirby()->urls()->index() . DS . 'download-zip'; // . basename(__DIR__) . '/download.php';
+}
+
+# Set the Download Button snippet
+$kirby->set('snippet', 'zipdl_form_btn', __DIR__ . '/snippets/zipdl_form_btn.php');
+# Set the Checkbox snippet
+$kirby->set('snippet', 'zipdl_checkbox', __DIR__ . '/snippets/zipdl_checkbox.php');
+# Set the Asset Gallery snippet
+$kirby->set('snippet', 'asset_gallery', __DIR__ . '/snippets/asset_gallery.php');
+
+# Set the /download route
+# and define the main Zipping action
+$kirby->set('route', array(
+  'pattern' => 'download-zip',
+  'method'  => 'POST',
+  'action'  => function() {
+    # get the POST values
+    # $current_page = strval($_POST["current_page"]);
+    # $selected_files = explode(',', $_POST["selection"]);
+    $selected_files = array();
+    foreach($_POST as $key => $value) {
+      if ($key == "current_page") {
+        $current_page = strval($value);
+      } else if($value=="on") {
+        # array_push($selected_files, strval(substr($key, 0, -4) . "." . substr($key, -3)));
+        array_push($selected_files, strval(substr($key, 0, strrpos($key, '_')) . "." . substr($key, strrpos($key, '_')+1)));
+      }
+    }
+
+    # set up an empty array
+    $files = array();
+
+    # loop through each file name
+    foreach(site()->page($current_page)->files() as $selected_file){
+      # check if the selected file exists as a file in the current page
+      # so it doesn't get abused
+      if($selected_file) {
+        # perhaps it would be best if a thumbnail of the image was called
+        # but I don't know if I can get the root address of the thumbnail
+
+        # fill up the main array with the root address of each image
+        array_push($files, $selected_file->root());
+      }
+    }
+
+    # only do the zip if we HAVE files
+    if (!empty($files)){
+
+      # this part of the code was adapted from StackOverflow
+      # http://stackoverflow.com/a/20216192
+      # Thank you all! I owe you all a beer.
+
+      # create new zip opbject
+      $zip = new ZipArchive();
+
+      # create a temp file & open it
+      $tmp_file = tempnam( kirby()->roots()->index() . '/site/plugins/kirby-zipdownload/temp' ,'');
+      $zip->open($tmp_file, ZipArchive::CREATE);
+
+      # loop through each file
+      foreach($files as $file){
+
+          # download file
+          $download_file = file_get_contents($file);
+
+          #add it to the zip
+          $zip->addFromString(basename($file),$download_file);
+
+      }
+
+      # close zip
+      $zip->close();
+
+      # send the file to the browser as a download
+      $name = site()->page($current_page)->uid().'_'.date('d-m-Y');
+      header('Content-disposition: attachment; filename='.$name.'.zip');
+      header('Content-type: application/zip');
+      readfile($tmp_file);
+    } else {
+      # That's a call to the function displaying the error message.
+      zipdl_errormessage_noFileSelected();
+    }
+    return false;
+  }
+
+));