1: <?php
  2: /**
  3:  * The IMP_Mime_Viewer_Pdf class enables generation of thumbnails for
  4:  * PDF attachments.
  5:  *
  6:  * Copyright 2008-2012 Horde LLC (http://www.horde.org/)
  7:  *
  8:  * See the enclosed file COPYING for license information (GPL). If you
  9:  * did not receive this file, see http://www.horde.org/licenses/gpl.
 10:  *
 11:  * @author   Michael Slusarz <slusarz@horde.org>
 12:  * @category Horde
 13:  * @license  http://www.horde.org/licenses/gpl GPL
 14:  * @package  IMP
 15:  */
 16: class IMP_Mime_Viewer_Pdf extends Horde_Mime_Viewer_Pdf
 17: {
 18:     /**
 19:      * This driver's display capabilities.
 20:      *
 21:      * @var array
 22:      */
 23:     protected $_capability = array(
 24:         'full' => true,
 25:         'info' => true,
 26:         'inline' => false,
 27:         'raw' => false
 28:     );
 29: 
 30:     /**
 31:      * Return the full rendered version of the Horde_Mime_Part object.
 32:      *
 33:      * URL parameters used by this function:
 34:      * <pre>
 35:      * 'pdf_view_thumbnail' - (boolean) Output the thumbnail info.
 36:      * </pre>
 37:      *
 38:      * @return array  See parent::render().
 39:      */
 40:     protected function _render()
 41:     {
 42:         /* Create the thumbnail and display. */
 43:         if (!Horde_Util::getFormData('pdf_view_thumbnail')) {
 44:             return parent::_render();
 45:         }
 46: 
 47:         $img = $this->_getHordeImageOb(true);
 48: 
 49:         if ($img) {
 50:             $img->resize(96, 96, true);
 51:             $type = $img->getContentType();
 52:             $data = $img->raw(true);
 53:         }
 54: 
 55:         if (!$img || !$data) {
 56:             $type = 'image/png';
 57:             $img_ob = Horde_Themes::img('mini-error.png', 'imp');
 58:             $data = file_get_contents($img_ob->fs);
 59:         }
 60: 
 61:         return array(
 62:             $this->_mimepart->getMimeId() => array(
 63:                 'data' => $data,
 64:                 'type' => $type
 65:             )
 66:         );
 67:     }
 68: 
 69:     /**
 70:      * Return the rendered information about the Horde_Mime_Part object.
 71:      *
 72:      * @return array  See parent::render().
 73:      */
 74:     protected function _renderInfo()
 75:     {
 76:         /* Check to see if convert utility is available. */
 77:         if (!$this->_getHordeImageOb(false)) {
 78:             return array();
 79:         }
 80: 
 81:         $status = new IMP_Mime_Status(_("This is a thumbnail of a PDF file attachment."));
 82:         $status->icon('mime/image.png');
 83: 
 84:         if ($GLOBALS['browser']->hasFeature('javascript')) {
 85:             $status->addText($this->getConfigParam('imp_contents')->linkViewJS($this->_mimepart, 'view_attach', $this->_outputImgTag(), null, null, null));
 86:         } else {
 87:             $status->addText(Horde::link($this->getConfigParam('imp_contents')->urlView($this->_mimepart, 'view_attach')) . $this->_outputImgTag() . '</a>');
 88:         }
 89: 
 90:         return array(
 91:             $this->_mimepart->getMimeId() => array(
 92:                 'data' => '',
 93:                 'status' => $status,
 94:                 'type' => 'text/html; charset=' . $this->getConfigParam('charset')
 95:             )
 96:         );
 97:     }
 98: 
 99:     /**
100:      * Return a Horde_Image object.
101:      *
102:      * @param boolean $load  Whether to load the image data.
103:      *
104:      * @return mixed  The Hore_Image object, or false on error.
105:      */
106:     protected function _getHordeImageOb($load)
107:     {
108:         if (!$GLOBALS['conf']['image']['driver']) {
109:             return false;
110:         }
111: 
112:         try {
113:             $img = $GLOBALS['injector']->getInstance('Horde_Core_Factory_Image')->create();
114:         } catch (Horde_Exception $e) {
115:             return false;
116:         }
117:         if (!$img->hasCapability('multipage') && !$img->hasCapability('pdf')) {
118:             return false;
119:         }
120: 
121:         if ($load) {
122:             try {
123:                 $img->loadString($this->_mimepart->getContents());
124:             } catch (Horde_Image_Exception $e) {
125:                 return false;
126:             }
127:         }
128: 
129:         try {
130:             if ($img instanceof Horde_Image_Imagick) {
131:                 /* Get rid of PDF transparency. */
132:                 $img->imagick->setImageBackgroundColor('white');
133:                 return $GLOBALS['injector']->getInstance('Horde_Core_Factory_Image')->create(array(
134:                     'data' => $img->imagick->flattenImages()->getImageBlob()
135:                 ));
136:             }
137: 
138:             return $img->getImageAtIndex(0);
139:         } catch (Horde_Image_Exception $e) {
140:             return false;
141:         }
142:     }
143: 
144:     /**
145:      * Output an image tag for the thumbnail.
146:      *
147:      * @return string  An image tag.
148:      */
149:     protected function _outputImgTag()
150:     {
151:         return '<img src="' . $this->getConfigParam('imp_contents')->urlView($this->_mimepart, 'view_attach', array('params' => array('pdf_view_thumbnail' => 1)))->setRaw(false) . '" alt="' . htmlspecialchars(_("View PDF File"), ENT_COMPAT, $this->getConfigParam('charset')) . '" />';
152:     }
153: 
154: }
155: