date_ical.module 14.8 KB
Newer Older
Karen Stevenson's avatar
Karen Stevenson committed
1
<?php
2

Karen Stevenson's avatar
Karen Stevenson committed
3
4
/**
 * @file
Robert Rollins's avatar
Robert Rollins committed
5
 * Adds ical functionality to Views, and an iCal parser to Feeds.
Karen Stevenson's avatar
Karen Stevenson committed
6
7
 */

8
9
/**
 * The version number of the current release. This is inserted into the PRODID
Robert Rollins's avatar
Robert Rollins committed
10
11
 * value of the iCal feeds created by Date iCal. It's primarily used for
 * debugging.
12
 */
13
define('DATE_ICAL_VERSION', '3.0-dev');
14

15
/**
Robert Rollins's avatar
Robert Rollins committed
16
 * Exception class for generic exceptions thrown by this module.
17
 */
Robert Rollins's avatar
Robert Rollins committed
18
class DateIcalException extends Exception {}
19

20
/**
21
 * Exception used by iCal Fields for when a date field is blank.
22
 */
Robert Rollins's avatar
Robert Rollins committed
23
class BlankDateFieldException extends DateIcalException {}
24
25

/**
Robert Rollins's avatar
Robert Rollins committed
26
 * Exception thrown when the Feeds parser plugin fails.
27
28
29
30
31
32
33
 */
class DateIcalParseException extends DateIcalException {}

/**
 * Implements hook_hook_info().
 */
function date_ical_hook_info() {
Robert Rollins's avatar
Robert Rollins committed
34
35
36
37
38
39
40
41
42
43
44
45
  $hooks = array(
    'date_ical_export_html_alter',
    'date_ical_export_raw_event_alter',
    'date_ical_export_vevent_alter',
    'date_ical_export_vcalendar_alter',
    'date_ical_export_post_render_alter',
    'date_ical_import_vcalendar_alter',
    'date_ical_import_component_alter',
    'date_ical_import_timezone_alter',
  );

  return array_fill_keys($hooks, array('group' => 'date_ical'));
46
47
}

Karen Stevenson's avatar
Karen Stevenson committed
48
/**
49
 * Implements hook_views_api().
Karen Stevenson's avatar
Karen Stevenson committed
50
51
52
53
 */
function date_ical_views_api() {
  return array(
    'api' => 3,
Robert Rollins's avatar
Robert Rollins committed
54
    'path' => drupal_get_path('module', 'date_ical') . '/includes',
Karen Stevenson's avatar
Karen Stevenson committed
55
56
57
  );
}

Robert Rollins's avatar
Robert Rollins committed
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
/**
 * Implements hook_feeds_plugins().
 */
function date_ical_feeds_plugins() {
  $path = drupal_get_path('module', 'date_ical') . '/includes';
  $info = array();
  $info['DateiCalFeedsParser'] = array(
    'name' => 'iCal parser',
    'description' => t('Parse iCal feeds.'),
    'handler' => array(
      'parent' => 'FeedsParser',
      'class' => 'DateiCalFeedsParser',
      'file' => 'DateiCalFeedsParser.inc',
      'path' => $path,
    ),
  );
  return $info;
}

Karen Stevenson's avatar
Karen Stevenson committed
77
78
79
/**
 * Implements hook_theme().
 */
80
function date_ical_theme($existing, $type, $theme, $path) {
Karen Stevenson's avatar
Karen Stevenson committed
81
82
  return array(
    'date_ical_icon' => array(
Robert Rollins's avatar
Robert Rollins committed
83
      'variables' => array('url' => NULL, 'tooltip' => NULL),
84
85
    ),
  );
Karen Stevenson's avatar
Karen Stevenson committed
86
87
88
}

/**
89
90
 * Theme function for the ical icon used by attached iCal feed.
 *
91
92
93
94
95
 * Available variables are:
 * $variables['tooltip'] - The tooltip to be used for the ican feed icon.
 * $variables['url'] - The url to the actual iCal feed.
 * $variables['view'] - The view object from which the iCal feed is being
 *   built (useful for contextual information).
Karen Stevenson's avatar
Karen Stevenson committed
96
 */
97
function theme_date_ical_icon($variables) {
98
99
100
  if (empty($variables['tooltip'])) {
    $variables['tooltip'] = t('Add this event to my calendar');
  }
Robert Rollins's avatar
Robert Rollins committed
101
102
  $variables['path'] = drupal_get_path('module', 'date_ical') . '/images/ical-feed-icon-34x14.png';
  $variables['alt'] = $variables['title'] = $variables['tooltip'];
Karen Stevenson's avatar
Karen Stevenson committed
103
  if ($image = theme('image', $variables)) {
Robert Rollins's avatar
Robert Rollins committed
104
105
106
107
    return "<a href='{$variables['url']}' class='ical-icon'>$image</a>";
  }
  else {
    return "<a href='{$variables['url']}' class='ical-icon'>{$variables['tooltip']}</a>";
Karen Stevenson's avatar
Karen Stevenson committed
108
109
110
111
  }
}

/**
112
 * Implements hook_preprocess_HOOK().
113
 *
114
115
116
 * Hides the page elements which don't belong in an iCal DESCRIPTION element.
 * The display of the body and other fields is controlled by the Manage
 * Display settings for the nodes' iCal view mode.
Karen Stevenson's avatar
Karen Stevenson committed
117
 */
118
119
function date_ical_preprocess_node(&$variables) {
  if (isset($variables['view_mode']) && $variables['view_mode'] == 'ical') {
120
121
    // Trick the default node template into not displaying the page title, by
    // telling it that this *is* a page.
122
    $variables['page'] = TRUE;
Karen Stevenson's avatar
Karen Stevenson committed
123
124
    $variables['title_prefix'] = '';
    $variables['title_suffix'] = '';
125
    
Robert Rollins's avatar
Robert Rollins committed
126
    // We don't want to see the author information in our feed.
Karen Stevenson's avatar
Karen Stevenson committed
127
    $variables['display_submitted'] = FALSE;
128
    
Robert Rollins's avatar
Robert Rollins committed
129
    // Comments and links don't belong in an iCal feed.
130
131
132
133
134
135
    if (isset($variables['content']['comments'])) {
      unset($variables['content']['comments']);
    }
    if (isset($variables['content']['links'])) {
      unset($variables['content']['links']);
    }
Karen Stevenson's avatar
Karen Stevenson committed
136
137
138
139
140
141
  }
}

/**
 * Implements hook_entity_info_alter().
 *
142
143
 * Adds an 'iCal' view mode for entities, which is used by the iCal Entity
 * View plugin.
Karen Stevenson's avatar
Karen Stevenson committed
144
 */
145
146
function date_ical_entity_info_alter(&$entity_info) {
  foreach ($entity_info as $entity_type => $info) {
Robert Rollins's avatar
Robert Rollins committed
147
148
149
    if (!isset($entity_info[$entity_type]['view modes'])) {
      $entity_info[$entity_type]['view modes'] = array();
    }
150
    $entity_info[$entity_type]['view modes'] += array(
Karen Stevenson's avatar
Karen Stevenson committed
151
152
      'ical' => array(
        'label' => t('iCal'),
153
154
        // Set the iCal view mode to default to same settings as the "default"
        // view mode, so it won't pollute Features.
155
        'custom settings' => FALSE,
Karen Stevenson's avatar
Karen Stevenson committed
156
157
158
159
160
      ),
    );
  }
}

Robert Rollins's avatar
Robert Rollins committed
161
162
163
164
165
166
/**
 * Implements hook_libraries_info().
 */
function date_ical_libraries_info() {
  $libraries['iCalcreator'] = array(
    'name' => 'iCalcreator',
167
168
    'vendor url' => 'http://github.com/iCalcreator/iCalcreator',
    'download url' => 'http://github.com/iCalcreator/iCalcreator',
Robert Rollins's avatar
Robert Rollins committed
169
170
171
172
173
174
175
176
177
    'version arguments' => array(
      'file' => 'iCalcreator.class.php',
      'pattern' => "/define\( 'ICALCREATOR_VERSION', 'iCalcreator ([\d\.]+)' \);/",
      'lines' => 100,
    ),
    'files' => array(
      'php' => array('iCalcreator.class.php'),
    ),
  );
178
  
Robert Rollins's avatar
Robert Rollins committed
179
180
181
182
  return $libraries;
}

/**
183
 * Implements hook_ctools_plugin_api().
Robert Rollins's avatar
Robert Rollins committed
184
185
186
187
188
189
190
 */
function date_ical_ctools_plugin_api($owner, $api) {
  if ($owner == 'feeds' && $api == 'plugins') {
    return array('version' => 2);
  }
}

191
192
193
/**
 * Implements hook_feeds_processor_targets_alter().
 *
194
 * Adds the "Field Name: Repeat Rule" target to Date Repeat fields.
195
 *
196
 * @see FeedsNodeProcessor::getMappingTargets()
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
 */
function date_ical_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_name) {
  foreach (field_info_instances($entity_type, $bundle_name) as $name => $instance) {
    $info = field_info_field($name);
    if (in_array($info['type'], array('date', 'datestamp', 'datetime')) && isset($info['settings']['repeat']) && $info['settings']['repeat']) {
      $targets[$name . ':rrule'] = array(
        'name' => t('@name: Repeat Rule', array('@name' => $instance['label'])),
        'callback' => 'date_ical_feeds_set_rrule',
        'description' => t('The repeat rule for the @name field.', array('@name' => $instance['label'])),
        'real_target' => $name,
      );
    }
  }
}

212
213
/**
 * Reformats the provided text to be compliant with the iCal spec.
214
 *
215
216
217
 * If the text contains HTML tags, those tags will be stripped (with <p> tags
 * converted to "\n\n" and link tags converted to footnotes), and uneeded
 * whitespace will be cleaned up.
218
 *
Robert Rollins's avatar
Robert Rollins committed
219
 * @param string $text
220
 *   The text to be sanitized.
221
 */
222
function date_ical_sanitize_text($text = '') {
223
224
  // Use Drupal's built-in HTML to Text converter, which does a mostly
  // adequate job of making the text iCal-compliant.
225
  $text = trim(drupal_html_to_text($text));
226
  // Replace instances of more than one space with exactly one space. This
227
  // cleans up the whitespace mess that drupal_html_to_text() leaves behind.
228
  $text = preg_replace("/  +/", " ", $text);
229
  // The call to drupal_html_to_text() above converted <p> to \n\n, and also
230
231
232
233
  // shoved a \n into the string every 80 characters. We don't want those
  // single \n's lying around, because iCalcreator will properly "fold" long
  // text fields for us. So, we need to remove all instances of \n which
  // are neither immediately preceeded, nor followed, by another \n.
234
235
236
  // However, \n's which are followed immediately by a > character should
  // remain, because of how drupal_html_to_text() converts <blockquote>.
  $text = preg_replace("/(?<!\n)\n(?![\n\>])/", " ", $text);
237
238
239
  return $text;
}

240
241
242
/**
 * Callback specified in date_ical_feeds_processor_targets_alter() for RRULEs.
 *
243
 * @param object $source
244
 *   The FeedsSource object.
245
 * @param object $entity
246
 *   The node that's being built from the iCal element that's being parsed.
247
 * @param string $target
248
249
 *   The machine name of the field into which this RRULE shall be parsed,
 *   with ":rrule" appended to the end.
250
 * @param string $feed_element
251
252
253
 *   The RRULE string (with optional EXDATEs and RDATEs separated by \n).
 */
function date_ical_feeds_set_rrule($source, $entity, $target, $feed_element) {
254
255
256
257
  if (empty($feed_element)) {
    // Make sure that VEVENTs which have no RRULE aren't given repeating dates.
    return;
  }
258
  // Add the RRULE value to the field in $entity.
Robert Rollins's avatar
Robert Rollins committed
259
260
  $exploded = explode(':', $target, 2);
  $field_name = $exploded[0];
261
262
263
  module_load_include('inc', 'date_api', 'date_api_ical');
  $info = field_info_field($field_name);
  foreach ($entity->{$field_name} as $lang => $field_array) {
264
265
    // Add the multiple date values that Date Repeat Field uses to represent
    // recurring dates.
Robert Rollins's avatar
Robert Rollins committed
266
    $values = date_repeat_build_dates($feed_element, NULL, $info, $field_array[0]);
267
268
269
270
271
272
    foreach ($values as $key => $value) {
      $entity->{$field_name}[$lang][$key] = $value;
    }
  }
}

273
/**
274
 * Identify all potential fields which could be used as an iCal LOCATION.
275
276
277
278
 */
function date_ical_get_location_fields($base = 'node', $reset = FALSE) {
  static $fields = array();
  $empty = array('name' => array(), 'alias' => array());
279
  
280
281
282
283
284
285
286
287
288
289
290
291
292
293
  if (empty($fields[$base]) || $reset) {
    $cid = 'date_ical_location_fields_' . $base;
    if (!$reset && $cached = cache_get($cid, 'cache_views')) {
      $fields[$base] = $cached->data;
    }
    else {
      $fields[$base] = _date_ical_get_location_fields($base);
    }
  }
  // Make sure that empty values will be arrays in the expected format.
  return !empty($fields) && !empty($fields[$base]) ? $fields[$base] : $empty;
}

/**
294
295
296
297
298
 * Internal helper function for date_ical_get_location_fields().
 *
 * This is a cut down version of _date_views_fields() from
 * date_views_fields.inc in date_views module.
 *
Robert Rollins's avatar
Robert Rollins committed
299
 * @return array
300
 *   array with fieldname, type, and table.
301
 *
302
 * @see date_views_date_views_fields()
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
 */
function _date_ical_get_location_fields($base = 'node') {
  // Make sure $base is never empty.
  if (empty($base)) {
    $base = 'node';
  }
  
  $cid = 'date_ical_location_fields_' . $base;
  cache_clear_all($cid, 'cache_views');
  
  // Iterate over all the fields that Views knows about.
  $all_fields = date_views_views_fetch_fields($base, 'field');
  $fields = array();
  foreach ($all_fields as $alias => $val) {
    $name = $alias;
    $tmp = explode('.', $name);
    $field_name = $tmp[1];
    $table_name = $tmp[0];
    
    // Skip unsupported field types and fields that weren't defined through
    // the Field module.
    $info = field_info_field($field_name);
325
326
327
328
329
330
331
332
    $supported_location_fields = array(
      'text',
      'text_long',
      'text_with_summary',
      'node_reference',
      'addressfield',
    );
    if (!$info || !in_array($info['type'], $supported_location_fields)) {
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
      continue;
    }
    
    // Build an array of the field info that we'll need.
    $alias = str_replace('.', '_', $alias);
    $fields['name'][$name] = array(
      'label' => "{$val['group']}: {$val['title']} ($field_name)",
      'table_name' => $table_name,
      'field_name' => $field_name,
      'type' => $info['type'],
    );
    
    // These are here only to make this $field array conform to the same format
    // as the one returned by _date_views_fields(). They're probably not needed,
    // but I thought that consistency would be a good idea.
    $fields['name'][$name]['real_field_name'] = $field_name;
    $fields['alias'][$alias] = $fields['name'][$name];
  }
  
  cache_set($cid, $fields, 'cache_views');
  return $fields;
}
355
356
357


/**
358
 * Identify all potential fields which could be used as an iCal SUMMARY.
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
 */
function date_ical_get_summary_fields($base = 'node', $reset = FALSE) {
  static $fields = array();
  $empty = array('name' => array(), 'alias' => array());

  if (empty($fields[$base]) || $reset) {
    $cid = 'date_ical_summary_fields_' . $base;
    if (!$reset && $cached = cache_get($cid, 'cache_views')) {
      $fields[$base] = $cached->data;
    }
    else {
      $fields[$base] = _date_ical_get_summary_fields($base);
    }
  }
  // Make sure that empty values will be arrays in the expected format.
  return !empty($fields) && !empty($fields[$base]) ? $fields[$base] : $empty;
}

/**
378
379
380
381
382
 * Internal helper function for date_ical_get_summary_fields().
 *
 * This is a cut down version of _date_views_fields() from
 * date_views_fields.inc in date_views module.
 *
Robert Rollins's avatar
Robert Rollins committed
383
 * @return array
384
 *   Array with fieldname, type, and table.
385
 *
Robert Rollins's avatar
Robert Rollins committed
386
 * @see date_views_date_views_fields()
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
 */
function _date_ical_get_summary_fields($base = 'node') {
  // Make sure $base is never empty.
  if (empty($base)) {
    $base = 'node';
  }

  $cid = 'date_ical_summary_fields_' . $base;
  cache_clear_all($cid, 'cache_views');

  // Iterate over all the fields that Views knows about.
  $all_fields = date_views_views_fetch_fields($base, 'field');
  $fields = array();
  foreach ($all_fields as $alias => $val) {
    $name = $alias;
    $tmp = explode('.', $name);
    $field_name = $tmp[1];
    $table_name = $tmp[0];

    // Skip unsupported field types and fields that weren't defined through
    // the Field module.
    $info = field_info_field($field_name);
409
410
411
412
413
414
415
416
    $supported_summary_fields = array(
      'text',
      'text_long',
      'text_with_summary',
      'node_reference',
      'taxonomy_term_reference',
    );
    if (!$info || !in_array($info['type'], $supported_summary_fields)) {
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
      continue;
    }

    // Build an array of the field info that we'll need.
    $alias = str_replace('.', '_', $alias);
    $fields['name'][$name] = array(
      'label' => "{$val['group']}: {$val['title']} ($field_name)",
      'table_name' => $table_name,
      'field_name' => $field_name,
      'type' => $info['type'],
    );

    // These are here only to make this $field array conform to the same format
    // as the one returned by _date_views_fields(). They're probably not needed,
    // but I thought that consistency would be a good idea.
    $fields['name'][$name]['real_field_name'] = $field_name;
    $fields['alias'][$alias] = $fields['name'][$name];
  }

  cache_set($cid, $fields, 'cache_views');
  return $fields;
}
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456

/**
 * Convert an rrule array to the iCalcreator format.
 *
 * iCalcreator expects the BYDAY element to be an array like this:
 * (array) ( [([plus] ordwk / minus ordwk)], "DAY" => weekday )
 *
 * But the way that the Date API gives it to us is like this:
 * (array) ( [([plus] ordwk / minus ordwk)]weekday )
 */
function _date_ical_convert_rrule_for_icalcreator($rrule) {
  $new_rrule = array();
  foreach ($rrule as $key => $value) {
    if (strtoupper($key) == 'DATA') {
      // iCalcreator doesn't expect the 'DATA' key that the Date API gives us.
      continue;
    }
    if (strtoupper($key) == 'UNTIL') {
Robert Rollins's avatar
Robert Rollins committed
457
      // iCalcreator expects the 'timestamp' to be array key for UNTIL.
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
      $value['timestamp'] = strtotime($value['datetime']);
    }
    if (strtoupper($key) == 'BYDAY') {
      $new_byday = array();
      foreach ($value as $day) {
        // Fortunately, the weekday values are always 2 characters.
        $weekday = substr($day, -2);
        $ordwk = substr($day, 0, -2);
        $new_byday[] = array($ordwk, 'DAY' => $weekday);
      }
      $value = $new_byday;
    }
    $new_rrule[$key] = $value;
  }
  return $new_rrule;
}