pdfjs-viewer.php

<?php
/*
Plugin Name: PDFjs Viewer
Plugin URI: http://byterevel.com/
Description: Embed PDFs with the gorgeous PDF.js viewer
Version: 1.3
Author: Ben Lawson
Author URI: http://byterevel.com/
License: GPLv3
*/


//==== Shortcode ====

//tell wordpress to register the pdfjs-viewer shortcode
add_shortcode("pdfjs-viewer", "pdfjs_handler");

function pdfjs_handler($incoming_from_post) {
  //set defaults 
  $incoming_from_post=shortcode_atts(array(
    'url' => 'bad-url.pdf',  
    'viewer_height' => '1360px',
    'viewer_width' => '100%',
    'fullscreen' => 'true',
    'download' => 'true',
    'print' => 'true',
    'openfile' => 'false'
  ), $incoming_from_post);

  $pdfjs_output = pdfjs_generator($incoming_from_post);

  //send back text to replace shortcode in post
  return $pdfjs_output;
}

function pdfjs_generator($incoming_from_handler) {
  $viewer_base_url= plugins_url()."/pdfjs-viewer-shortcode/pdfjs/web/viewer.php";
  

  $file_name = $incoming_from_handler["url"];
  $viewer_height = $incoming_from_handler["viewer_height"];
  $viewer_width = $incoming_from_handler["viewer_width"];
  $fullscreen = $incoming_from_handler["fullscreen"];
  $download = $incoming_from_handler["download"];
  $print = $incoming_from_handler["print"];
  $openfile = $incoming_from_handler["openfile"];
  
  if ($download != 'true') {
      $download = 'false';
  }
  
  if ($print != 'true') {
      $print = 'false';
  }
  
  if ($openfile != 'true') {
      $openfile = 'false';
  }
  
  $final_url = $viewer_base_url."?file=".$file_name."&download=".$download."&print=".$print."&openfile=".$openfile;
  
  $fullscreen_link = '';
  if($fullscreen == 'true'){
       $fullscreen_link = '<a href="'.$final_url.'">View Fullscreen</a><br>';
  }
  $iframe_code = '<iframe width="'.$viewer_width.'" height="'.$viewer_height.'" src="'.$final_url.'"></iframe> ';
  
  return $fullscreen_link.$iframe_code;
}

//==== Media Button ====

//priority is 12 since default button is 10
add_action('media_buttons', 'pdfjs_media_button', 12);
function pdfjs_media_button() {
    echo '<a href="#" id="insert-pdfjs" class="button">Add PDF</a>';
}

add_action('wp_enqueue_media', 'include_pdfjs_media_button_js_file');
function include_pdfjs_media_button_js_file() {
    wp_enqueue_script('media_button', plugins_url().'/pdfjs-viewer-shortcode/pdfjs-media-button.js', array('jquery'), '1.0', true);
}

?>