1: <?php
  2: /**
  3:  * Copyright 2002-2014 Horde LLC (http://www.horde.org/)
  4:  *
  5:  * See the enclosed file COPYING for license information (GPL). If you
  6:  * did not receive this file, see http://www.horde.org/licenses/gpl.
  7:  *
  8:  * @category  Horde
  9:  * @copyright 2002-2014 Horde LLC
 10:  * @license   http://www.horde.org/licenses/gpl GPL
 11:  * @package   IMP
 12:  */
 13: 
 14: /**
 15:  * Renderer for image data.
 16:  *
 17:  * @author    Michael Slusarz <slusarz@horde.org>
 18:  * @category  Horde
 19:  * @copyright 2002-2014 Horde LLC
 20:  * @license   http://www.horde.org/licenses/gpl GPL
 21:  * @package   IMP
 22:  */
 23: class IMP_Mime_Viewer_Images extends Horde_Mime_Viewer_Images
 24: {
 25:     /**
 26:      * This driver's display capabilities.
 27:      *
 28:      * @var array
 29:      */
 30:     protected $_capability = array(
 31:         'full' => false,
 32:         'info' => true,
 33:         'inline' => true,
 34:         'raw' => false
 35:     );
 36: 
 37:     /**
 38:      */
 39:     public function canRender($mode)
 40:     {
 41:         global $browser, $registry;
 42: 
 43:         switch ($mode) {
 44:         case 'full':
 45:         case 'raw':
 46:             /* Only display raw images we know the browser supports, and we
 47:              * know can't cause any sort of security issue. */
 48:             if ($browser->isViewable($this->_getType())) {
 49:                 return true;
 50:             }
 51:             break;
 52: 
 53:         case 'inline':
 54:             /* For minimal view: allow rendering of attachments inline (on the
 55:              * view parts page). */
 56:             if ($registry->getView() == $registry::VIEW_MINIMAL) {
 57:                 return true;
 58:             }
 59:             break;
 60:         }
 61: 
 62:         return parent::canRender($mode);
 63:     }
 64: 
 65:     /**
 66:      * Return the full rendered version of the Horde_Mime_Part object.
 67:      *
 68:      * URL parameters used by this function:
 69:      *   - imp_img_view: (string) One of the following:
 70:      *     - data: Output the image directly.
 71:      *     - view_convert: Convert the image to browser-viewable format and
 72:      *                     display.
 73:      *     - view_thumbnail: Create thumbnail and display.
 74:      *
 75:      * @return array  See parent::render().
 76:      */
 77:     protected function _render()
 78:     {
 79:         switch ($GLOBALS['injector']->getInstance('Horde_Variables')->imp_img_view) {
 80:         case 'data':
 81:             /* If calling page is asking us to output data, do that without
 82:              * any further delay and exit. */
 83:             return parent::_render();
 84: 
 85:         case 'view_convert':
 86:             /* Convert image to browser-viewable format and display. */
 87:             return $this->_viewConvert(false);
 88: 
 89:         case 'view_thumbnail':
 90:             /* Create thumbnail and display. */
 91:             return $this->_viewConvert(true);
 92: 
 93:         default:
 94:             return parent::_render();
 95:         }
 96:     }
 97: 
 98:     /**
 99:      * Return the rendered inline version of the Horde_Mime_Part object.
100:      *
101:      * @return array  See parent::render().
102:      */
103:     protected function _renderInline()
104:     {
105:         /* Only display the image inline if the browser can display it and the
106:          * size of the image is below the config value. */
107:         if ($GLOBALS['browser']->isViewable($this->_getType())) {
108:             if (!isset($this->_conf['inlinesize']) ||
109:                 ($this->_mimepart->getBytes() < $this->_conf['inlinesize'])) {
110:                 $showimg = $GLOBALS['injector']->getInstance('IMP_Images')->showInlineImage($this->getConfigParam('imp_contents'));
111:             } else {
112:                 /* For minimal view - allow rendering of attachments inline
113:                  * (on the view parts page). */
114:                 $showimg = ($GLOBALS['registry']->getView() == Horde_Registry::VIEW_MINIMAL);
115:             }
116: 
117:             if (!$showimg) {
118:                 return $this->_renderInfo();
119:             }
120: 
121:             /* Viewing inline, and the browser can handle the image type
122:              * directly. So output an <img> tag to load the image. */
123:             return array(
124:                 $this->_mimepart->getMimeId() => array(
125:                     'data' => $this->_outputImgTag('data', $this->_mimepart->getName(true)),
126:                     'type' => 'text/html; charset=' . $this->getConfigParam('charset')
127:                 )
128:             );
129:         }
130: 
131:         /* The browser cannot view this image. Inform the user of this and
132:          * ask user if we should convert to another image type. */
133:         $status = new IMP_Mime_Status(_("Your browser does not support inline display of this image type."));
134: 
135:         /* See if we can convert to an inline browser viewable form. */
136:         switch ($GLOBALS['registry']->getView()) {
137:         case Horde_Registry::VIEW_MINIMAL:
138:             // Do nothing.
139:             break;
140: 
141:         default:
142:             $img = $this->_getHordeImageOb(false);
143:             if ($img &&
144:                 $GLOBALS['browser']->isViewable($img->getContentType())) {
145:                 $convert_link = $this->getConfigParam('imp_contents')->linkViewJS($this->_mimepart, 'view_attach', _("HERE"), array('params' => array('imp_img_view' => 'view_convert')));
146:                 $status->addText(sprintf(_("Click %s to convert the image file into a format your browser can attempt to view."), $convert_link));
147:             }
148:             break;
149:         }
150: 
151:         return array(
152:             $this->_mimepart->getMimeId() => array(
153:                 'data' => '',
154:                 'status' => $status,
155:                 'type' => 'text/html; charset=' . $this->getConfigParam('charset')
156:             )
157:         );
158:     }
159: 
160:     /**
161:      * Return the rendered information about the Horde_Mime_Part object.
162:      *
163:      * @return array  See parent::render().
164:      */
165:     protected function _renderInfo()
166:     {
167:         /* Check to see if convert utility is available. */
168:         if (!$this->_getHordeImageOb(false)) {
169:             return array();
170:         }
171: 
172:         $status = new IMP_Mime_Status(_("This is a thumbnail of an image attachment."));
173:         $status->icon('mime/image.png');
174: 
175:         switch ($GLOBALS['registry']->getView()) {
176:         case Horde_Registry::VIEW_MINIMAL:
177:             $status->addText(Horde::link($this->getConfigParam('imp_contents')->urlView($this->_mimepart, 'view_attach')) . $this->_outputImgTag('view_thumbnail', _("View Attachment")) . '</a>');
178:             break;
179: 
180:         default:
181:             $status->addText($this->getConfigParam('imp_contents')->linkViewJS($this->_mimepart, 'view_attach', $this->_outputImgTag('view_thumbnail', _("View Attachment")), null, null, null));
182:         }
183: 
184:         return array(
185:             $this->_mimepart->getMimeId() => array(
186:                 'data' => '',
187:                 'status' => $status,
188:                 'type' => 'text/html; charset=' . $this->getConfigParam('charset')
189:             )
190:         );
191:     }
192: 
193:     /**
194:      * Return the full rendered version of the Horde_Mime_Part object.
195:      *
196:      * @return array  See parent::render().
197:      */
198:     protected function _renderRaw()
199:     {
200:         return parent::_render();
201:     }
202: 
203:     /**
204:      * Convert image.
205:      *
206:      * @param boolean $thumb  View image in thumbnail size?
207:      *
208:      * @return string  The image data.
209:      */
210:     protected function _viewConvert($thumb)
211:     {
212:         $img = $this->_getHordeImageOb(true);
213: 
214:         if ($img) {
215:             if ($thumb) {
216:                 $dim = $img->getDimensions();
217:                 if (($dim['height'] > 150) || ($dim['width'] > 150)) {
218:                     $img->resize(150, 150, true);
219:                 }
220:             }
221:             $type = $img->getContentType();
222:             try {
223:                 $data = $img->raw(true);
224:             } catch (Exception $e) {}
225:         }
226: 
227:         if (!$img || !$data) {
228:             $type = 'image/png';
229:             $img_ob = Horde_Themes::img('mini-error.png', 'imp');
230:             $data = file_get_contents($img_ob->fs);
231:         }
232: 
233:         return array(
234:             $this->_mimepart->getMimeId() => array(
235:                 'data' => $data,
236:                 'type' => $type
237:             )
238:         );
239:     }
240: 
241:     /**
242:      * Return a Horde_Image object.
243:      *
244:      * @param boolean $load  Whether to load the image data.
245:      *
246:      * @return mixed  The Horde_Image object, or false on error.
247:      */
248:     protected function _getHordeImageOb($load)
249:     {
250:         if (!$this->getConfigParam('thumbnails')) {
251:             return false;
252:         }
253: 
254:         try {
255:             if (($img = $GLOBALS['injector']->getInstance('Horde_Core_Factory_Image')->create()) && $load) {
256:                 $img->loadString($this->_mimepart->getContents());
257:             }
258:             return $img;
259:         } catch (Horde_Exception $e) {
260:             Horde::log($e, 'DEBUG');
261:         }
262: 
263:         return false;
264:     }
265: 
266:     /**
267:      * Output an image tag.
268:      *
269:      * @param string $type  The view type.
270:      * @param string $alt   The ALT text.
271:      *
272:      * @return string  An image tag.
273:      */
274:     protected function _outputImgTag($type, $alt)
275:     {
276:         global $browser;
277: 
278:         switch ($type) {
279:         case 'view_thumbnail':
280:             if ($this->getConfigParam('thumbnails_dataurl') &&
281:                 $browser->getFeature('dataurl')) {
282:                 $thumb = $this->_viewConvert(true);
283:                 $thumb = reset($thumb);
284:                 $src = Horde_Url_Data::create($thumb['type'], $thumb['data']);
285:                 break;
286:             }
287: 
288:         default:
289:             $src = $this->getConfigParam('imp_contents')->urlView($this->_mimepart, 'view_attach', array('params' => array('imp_img_view' => $type)));
290:             break;
291:         }
292: 
293:         return '<img src="' . $src . '" alt="' . htmlspecialchars($alt, ENT_COMPAT, $this->getConfigParam('charset')) . '" />';
294:     }
295: 
296: }
297: