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1 | <?php | |
2 | namespace Shaarli; | |
3 | ||
4 | use DateTime; | |
5 | use Exception; | |
6 | use Shaarli\Bookmark\Bookmark; | |
7 | use Shaarli\Helper\FileUtils; | |
8 | ||
9 | /** | |
10 | * Class History | |
11 | * | |
12 | * Handle the history file tracing events in Shaarli. | |
13 | * The history is stored as JSON in a file set by 'resource.history' setting. | |
14 | * | |
15 | * Available data: | |
16 | * - event: event key | |
17 | * - datetime: event date, in ISO8601 format. | |
18 | * - id: event item identifier (currently only link IDs). | |
19 | * | |
20 | * Available event keys: | |
21 | * - CREATED: new link | |
22 | * - UPDATED: link updated | |
23 | * - DELETED: link deleted | |
24 | * - SETTINGS: the settings have been updated through the UI. | |
25 | * - IMPORT: bulk bookmarks import | |
26 | * | |
27 | * Note: new events are put at the beginning of the file and history array. | |
28 | */ | |
29 | class History | |
30 | { | |
31 | /** | |
32 | * @var string Action key: a new link has been created. | |
33 | */ | |
34 | const CREATED = 'CREATED'; | |
35 | ||
36 | /** | |
37 | * @var string Action key: a link has been updated. | |
38 | */ | |
39 | const UPDATED = 'UPDATED'; | |
40 | ||
41 | /** | |
42 | * @var string Action key: a link has been deleted. | |
43 | */ | |
44 | const DELETED = 'DELETED'; | |
45 | ||
46 | /** | |
47 | * @var string Action key: settings have been updated. | |
48 | */ | |
49 | const SETTINGS = 'SETTINGS'; | |
50 | ||
51 | /** | |
52 | * @var string Action key: a bulk import has been processed. | |
53 | */ | |
54 | const IMPORT = 'IMPORT'; | |
55 | ||
56 | /** | |
57 | * @var string History file path. | |
58 | */ | |
59 | protected $historyFilePath; | |
60 | ||
61 | /** | |
62 | * @var array History data. | |
63 | */ | |
64 | protected $history; | |
65 | ||
66 | /** | |
67 | * @var int History retention time in seconds (1 month). | |
68 | */ | |
69 | protected $retentionTime = 2678400; | |
70 | ||
71 | /** | |
72 | * History constructor. | |
73 | * | |
74 | * @param string $historyFilePath History file path. | |
75 | * @param int $retentionTime History content retention time in seconds. | |
76 | * | |
77 | * @throws Exception if something goes wrong. | |
78 | */ | |
79 | public function __construct($historyFilePath, $retentionTime = null) | |
80 | { | |
81 | $this->historyFilePath = $historyFilePath; | |
82 | if ($retentionTime !== null) { | |
83 | $this->retentionTime = $retentionTime; | |
84 | } | |
85 | } | |
86 | ||
87 | /** | |
88 | * Initialize: read history file. | |
89 | * | |
90 | * Allow lazy loading (don't read the file if it isn't necessary). | |
91 | */ | |
92 | protected function initialize() | |
93 | { | |
94 | $this->check(); | |
95 | $this->read(); | |
96 | } | |
97 | ||
98 | /** | |
99 | * Add Event: new link. | |
100 | * | |
101 | * @param Bookmark $link Link data. | |
102 | */ | |
103 | public function addLink($link) | |
104 | { | |
105 | $this->addEvent(self::CREATED, $link->getId()); | |
106 | } | |
107 | ||
108 | /** | |
109 | * Add Event: update existing link. | |
110 | * | |
111 | * @param Bookmark $link Link data. | |
112 | */ | |
113 | public function updateLink($link) | |
114 | { | |
115 | $this->addEvent(self::UPDATED, $link->getId()); | |
116 | } | |
117 | ||
118 | /** | |
119 | * Add Event: delete existing link. | |
120 | * | |
121 | * @param Bookmark $link Link data. | |
122 | */ | |
123 | public function deleteLink($link) | |
124 | { | |
125 | $this->addEvent(self::DELETED, $link->getId()); | |
126 | } | |
127 | ||
128 | /** | |
129 | * Add Event: settings updated. | |
130 | */ | |
131 | public function updateSettings() | |
132 | { | |
133 | $this->addEvent(self::SETTINGS); | |
134 | } | |
135 | ||
136 | /** | |
137 | * Add Event: bulk import. | |
138 | * | |
139 | * Note: we don't store bookmarks add/update one by one since it can have a huge impact on performances. | |
140 | */ | |
141 | public function importLinks() | |
142 | { | |
143 | $this->addEvent(self::IMPORT); | |
144 | } | |
145 | ||
146 | /** | |
147 | * Save a new event and write it in the history file. | |
148 | * | |
149 | * @param string $status Event key, should be defined as constant. | |
150 | * @param mixed $id Event item identifier (e.g. link ID). | |
151 | */ | |
152 | protected function addEvent($status, $id = null) | |
153 | { | |
154 | if ($this->history === null) { | |
155 | $this->initialize(); | |
156 | } | |
157 | ||
158 | $item = [ | |
159 | 'event' => $status, | |
160 | 'datetime' => new DateTime(), | |
161 | 'id' => $id !== null ? $id : '', | |
162 | ]; | |
163 | $this->history = array_merge([$item], $this->history); | |
164 | $this->write(); | |
165 | } | |
166 | ||
167 | /** | |
168 | * Check that the history file is writable. | |
169 | * Create the file if it doesn't exist. | |
170 | * | |
171 | * @throws Exception if it isn't writable. | |
172 | */ | |
173 | protected function check() | |
174 | { | |
175 | if (!is_file($this->historyFilePath)) { | |
176 | FileUtils::writeFlatDB($this->historyFilePath, []); | |
177 | } | |
178 | ||
179 | if (!is_writable($this->historyFilePath)) { | |
180 | throw new Exception(t('History file isn\'t readable or writable')); | |
181 | } | |
182 | } | |
183 | ||
184 | /** | |
185 | * Read JSON history file. | |
186 | */ | |
187 | protected function read() | |
188 | { | |
189 | $this->history = FileUtils::readFlatDB($this->historyFilePath, []); | |
190 | if ($this->history === false) { | |
191 | throw new Exception(t('Could not parse history file')); | |
192 | } | |
193 | } | |
194 | ||
195 | /** | |
196 | * Write JSON history file and delete old entries. | |
197 | */ | |
198 | protected function write() | |
199 | { | |
200 | $comparaison = new DateTime('-' . $this->retentionTime . ' seconds'); | |
201 | foreach ($this->history as $key => $value) { | |
202 | if ($value['datetime'] < $comparaison) { | |
203 | unset($this->history[$key]); | |
204 | } | |
205 | } | |
206 | FileUtils::writeFlatDB($this->historyFilePath, array_values($this->history)); | |
207 | } | |
208 | ||
209 | /** | |
210 | * Get the History. | |
211 | * | |
212 | * @return array | |
213 | */ | |
214 | public function getHistory() | |
215 | { | |
216 | if ($this->history === null) { | |
217 | $this->initialize(); | |
218 | } | |
219 | ||
220 | return $this->history; | |
221 | } | |
222 | } |