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1 | <?php |
2 | /* | |
3 | +--------------------------------------------------------------------+ | |
4 | | CiviCRM version 4.3 | | |
5 | +--------------------------------------------------------------------+ | |
6 | | Copyright CiviCRM LLC (c) 2004-2013 | | |
7 | +--------------------------------------------------------------------+ | |
8 | | This file is a part of CiviCRM. | | |
9 | | | | |
10 | | CiviCRM is free software; you can copy, modify, and distribute it | | |
11 | | under the terms of the GNU Affero General Public License | | |
12 | | Version 3, 19 November 2007 and the CiviCRM Licensing Exception. | | |
13 | | | | |
14 | | CiviCRM is distributed in the hope that it will be useful, but | | |
15 | | WITHOUT ANY WARRANTY; without even the implied warranty of | | |
16 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | | |
17 | | See the GNU Affero General Public License for more details. | | |
18 | | | | |
19 | | You should have received a copy of the GNU Affero General Public | | |
20 | | License and the CiviCRM Licensing Exception along | | |
21 | | with this program; if not, contact CiviCRM LLC | | |
22 | | at info[AT]civicrm[DOT]org. If you have questions about the | | |
23 | | GNU Affero General Public License or the licensing of CiviCRM, | | |
24 | | see the CiviCRM license FAQ at http://civicrm.org/licensing | | |
25 | +--------------------------------------------------------------------+ | |
26 | */ | |
27 | ||
28 | /** | |
29 | * Manage the download, validation, and rendering of community messages | |
30 | */ | |
31 | class CRM_Core_CommunityMessages { | |
32 | ||
06847d3d | 33 | const DEFAULT_MESSAGES_URL = 'http://alert.civicrm.org/alert?prot=1&ver={ver}&uf={uf}&sid={sid}&lang={lang}&co={co}'; |
dc92f2f8 | 34 | const DEFAULT_PERMISSION = 'administer CiviCRM'; |
e8977170 | 35 | |
ecbe1139 TO |
36 | /** |
37 | * Default time to wait before retrying | |
38 | */ | |
39 | const DEFAULT_RETRY = 7200; // 2 hours | |
40 | ||
41 | /** | |
42 | * @var CRM_Utils_HttpClient | |
43 | */ | |
44 | protected $client; | |
45 | ||
46 | /** | |
47 | * @var CRM_Utils_Cache_Interface | |
48 | */ | |
49 | protected $cache; | |
50 | ||
e8977170 TO |
51 | /** |
52 | * @var FALSE|string | |
53 | */ | |
54 | protected $messagesUrl; | |
55 | ||
847c93ac TO |
56 | /** |
57 | * Create default instance | |
58 | * | |
59 | * @return CRM_Core_CommunityMessages | |
60 | */ | |
61 | public static function create() { | |
62 | return new CRM_Core_CommunityMessages( | |
63 | new CRM_Utils_Cache_SqlGroup(array( | |
64 | 'group' => 'community-messages', | |
65 | 'prefetch' => FALSE, | |
66 | )), | |
67 | CRM_Utils_HttpClient::singleton() | |
68 | ); | |
69 | } | |
70 | ||
ecbe1139 TO |
71 | /** |
72 | * @param CRM_Utils_Cache_Interface $cache | |
73 | * @param CRM_Utils_HttpClient $client | |
74 | */ | |
e8977170 | 75 | public function __construct($cache, $client, $messagesUrl = NULL) { |
ecbe1139 TO |
76 | $this->cache = $cache; |
77 | $this->client = $client; | |
e8977170 | 78 | if ($messagesUrl === NULL) { |
847c93ac | 79 | $this->messagesUrl = CRM_Core_BAO_Setting::getItem(CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME, 'communityMessagesUrl', NULL, '*default*'); |
e8977170 TO |
80 | } |
81 | else { | |
82 | $this->messagesUrl = $messagesUrl; | |
83 | } | |
847c93ac TO |
84 | if ($this->messagesUrl === '*default*') { |
85 | $this->messagesUrl = self::DEFAULT_MESSAGES_URL; | |
86 | } | |
ecbe1139 TO |
87 | } |
88 | ||
89 | /** | |
d1b65097 | 90 | * Get the messages document (either from the cache or by downloading) |
ecbe1139 TO |
91 | * |
92 | * @return NULL|array | |
93 | */ | |
94 | public function getDocument() { | |
ecbe1139 TO |
95 | $isChanged = FALSE; |
96 | $document = $this->cache->get('communityMessages'); | |
97 | ||
98 | if (empty($document) || !is_array($document)) { | |
99 | $document = array( | |
100 | 'messages' => array(), | |
101 | 'expires' => 0, // ASAP | |
102 | 'ttl' => self::DEFAULT_RETRY, | |
103 | 'retry' => self::DEFAULT_RETRY, | |
104 | ); | |
105 | $isChanged = TRUE; | |
106 | } | |
107 | ||
108 | if ($document['expires'] <= CRM_Utils_Time::getTimeRaw()) { | |
847c93ac | 109 | $newDocument = $this->fetchDocument(); |
8bfc3cb1 | 110 | if ($newDocument && $this->validateDocument($newDocument)) { |
ecbe1139 TO |
111 | $document = $newDocument; |
112 | $document['expires'] = CRM_Utils_Time::getTimeRaw() + $document['ttl']; | |
e8977170 TO |
113 | } |
114 | else { | |
d1b65097 | 115 | // keep the old messages for now, try again later |
ecbe1139 TO |
116 | $document['expires'] = CRM_Utils_Time::getTimeRaw() + $document['retry']; |
117 | } | |
118 | $isChanged = TRUE; | |
119 | } | |
120 | ||
121 | if ($isChanged) { | |
122 | $this->cache->set('communityMessages', $document); | |
123 | } | |
124 | ||
125 | return $document; | |
126 | } | |
127 | ||
128 | /** | |
129 | * Download document from URL and parse as JSON | |
130 | * | |
ecbe1139 TO |
131 | * @return NULL|array parsed JSON |
132 | */ | |
847c93ac TO |
133 | public function fetchDocument() { |
134 | list($status, $json) = $this->client->get($this->getRenderedUrl()); | |
ecbe1139 TO |
135 | if ($status != CRM_Utils_HttpClient::STATUS_OK || empty($json)) { |
136 | return NULL; | |
137 | } | |
138 | $doc = json_decode($json, TRUE); | |
139 | if (empty($doc) || json_last_error() != JSON_ERROR_NONE) { | |
140 | return NULL; | |
141 | } | |
142 | return $doc; | |
143 | } | |
144 | ||
847c93ac TO |
145 | /** |
146 | * Get the final, usable URL string (after interpolating any variables) | |
147 | * | |
148 | * @return FALSE|string | |
149 | */ | |
150 | public function getRenderedUrl() { | |
151 | return CRM_Utils_System::evalUrl($this->messagesUrl); | |
152 | } | |
153 | ||
154 | /** | |
155 | * @return bool | |
156 | */ | |
157 | public function isEnabled() { | |
158 | return $this->messagesUrl !== FALSE && $this->messagesUrl !== 'FALSE'; | |
159 | } | |
160 | ||
ecbe1139 | 161 | /** |
d1b65097 | 162 | * Pick a message to display |
ecbe1139 | 163 | * |
ecbe1139 TO |
164 | * @return NULL|array |
165 | */ | |
dc92f2f8 TO |
166 | public function pick() { |
167 | $document = $this->getDocument(); | |
168 | $messages = array(); | |
169 | foreach ($document['messages'] as $message) { | |
170 | if (!isset($message['perms'])) { | |
171 | $message['perms'] = array(self::DEFAULT_PERMISSION); | |
172 | } | |
173 | if (!CRM_Core_Permission::checkAnyPerm($message['perms'])) { | |
174 | continue; | |
175 | } | |
176 | ||
177 | if (isset($message['components'])) { | |
178 | $enabled = array_keys(CRM_Core_Component::getEnabledComponents()); | |
179 | if (count(array_intersect($enabled, $message['components'])) == 0) { | |
180 | continue; | |
181 | } | |
182 | } | |
183 | ||
184 | $messages[] = $message; | |
185 | } | |
186 | if (empty($messages)) { | |
187 | return NULL; | |
188 | } | |
189 | ||
190 | $idx = rand(0, count($messages) - 1); | |
191 | return $messages[$idx]; | |
ecbe1139 TO |
192 | } |
193 | ||
194 | /** | |
195 | * @param string $markup | |
196 | * @return string | |
197 | */ | |
198 | public static function evalMarkup($markup) { | |
d1b65097 TO |
199 | $config = CRM_Core_Config::singleton(); |
200 | $vals = array( | |
201 | 'resourceUrl' => rtrim($config->resourceBase, '/'), | |
202 | 'ver' => CRM_Utils_System::version(), | |
203 | 'uf' => $config->userFramework, | |
204 | 'php' => phpversion(), | |
205 | 'sid' => md5('sid_' . (defined('CIVICRM_SITE_KEY') ? CIVICRM_SITE_KEY : '') . '_' . $config->userFrameworkBaseURL), | |
206 | 'baseUrl' => $config->userFrameworkBaseURL, | |
207 | 'lang' => $config->lcMessages, | |
208 | 'co' => $config->defaultContactCountry, | |
209 | ); | |
210 | $vars = array(); | |
211 | foreach ($vals as $k => $v) { | |
847c93ac TO |
212 | $vars['%%' . $k . '%%'] = $v; |
213 | $vars['{{' . $k . '}}'] = urlencode($v); | |
d1b65097 TO |
214 | } |
215 | return strtr($markup, $vars); | |
ecbe1139 TO |
216 | } |
217 | ||
8bfc3cb1 TO |
218 | /** |
219 | * Ensure that a document is well-formed | |
220 | * | |
221 | * @param array $document | |
222 | * @return bool | |
223 | */ | |
224 | public function validateDocument($document) { | |
225 | if (!isset($document['ttl']) || !is_integer($document['ttl'])) { | |
226 | return FALSE; | |
227 | } | |
228 | if (!isset($document['retry']) || !is_integer($document['retry'])) { | |
229 | return FALSE; | |
230 | } | |
231 | if (!isset($document['messages']) || !is_array($document['messages'])) { | |
232 | return FALSE; | |
233 | } | |
234 | foreach ($document['messages'] as $message) { | |
235 | // TODO validate $message['markup'] | |
236 | } | |
237 | ||
238 | return TRUE; | |
239 | } | |
240 | ||
ecbe1139 | 241 | } |