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| 1 | <?php |
| 2 | // This file is part of Moodle - https://moodle.org/ |
| 3 | // |
| 4 | // Moodle is free software: you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation, either version 3 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // Moodle is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with Moodle. If not, see <https://www.gnu.org/licenses/>. |
| 16 | |
| 17 | /** |
| 18 | * Privacy provider. |
| 19 | * |
| 20 | * @package local_atrisk |
| 21 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 22 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 23 | */ |
| 24 | |
| 25 | namespace local_atrisk\privacy; |
| 26 | |
| 27 | use core_privacy\local\metadata\collection; |
| 28 | use core_privacy\local\request\approved_contextlist; |
| 29 | use core_privacy\local\request\approved_userlist; |
| 30 | use core_privacy\local\request\contextlist; |
| 31 | use core_privacy\local\request\transform; |
| 32 | use core_privacy\local\request\userlist; |
| 33 | use core_privacy\local\request\writer; |
| 34 | |
| 35 | /** |
| 36 | * Privacy provider, driven by the TABLES map below. |
| 37 | * |
| 38 | * @package local_atrisk |
| 39 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 40 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 41 | */ |
| 42 | class provider implements |
| 43 | \core_privacy\local\metadata\provider, |
| 44 | \core_privacy\local\request\core_userlist_provider, |
| 45 | \core_privacy\local\request\plugin\provider { |
| 46 | /** |
| 47 | * Each table with personal data. The owner's rows are deleted with the owner; actor fields (who |
| 48 | * changed or decided something) are set to 0 instead, so the owner's record stays whole. |
| 49 | * 'instance' is the field holding the context instance id, or null for the system context. |
| 50 | */ |
| 51 | private const TABLES = [ |
| 52 | 'local_atrisk_flag' => [ |
| 53 | 'key' => 'flag', |
| 54 | 'level' => CONTEXT_COURSE, |
| 55 | 'instance' => 'courseid', |
| 56 | 'owner' => 'userid', |
| 57 | 'actors' => [], |
| 58 | 'fields' => ['userid', 'courseid', 'inactive', 'missed', 'grade', 'timecreated'], |
| 59 | ], |
| 60 | 'local_atrisk_contact' => [ |
| 61 | 'key' => 'contact', |
| 62 | 'level' => CONTEXT_COURSE, |
| 63 | 'instance' => 'courseid', |
| 64 | 'owner' => 'userid', |
| 65 | 'actors' => ['contactedby'], |
| 66 | 'fields' => ['userid', 'courseid', 'contactedby', 'note', 'timecreated'], |
| 67 | ], |
| 68 | ]; |
| 69 | |
| 70 | /** |
| 71 | * Describe the stored data. |
| 72 | * |
| 73 | * @param collection $collection |
| 74 | * @return collection |
| 75 | */ |
| 76 | public static function get_metadata(collection $collection): collection { |
| 77 | foreach (self::TABLES as $table => $t) { |
| 78 | $fields = []; |
| 79 | foreach ($t['fields'] as $f) { |
| 80 | $fields[$f] = "privacy:metadata:{$t['key']}:$f"; |
| 81 | } |
| 82 | $collection->add_database_table($table, $fields, "privacy:metadata:{$t['key']}"); |
| 83 | } |
| 84 | return $collection; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * SQL matching rows where any user field is one of the given users. |
| 89 | * |
| 90 | * @param array $t table definition |
| 91 | * @param array $userids |
| 92 | * @return array [sql, params] |
| 93 | */ |
| 94 | private static function user_where(array $t, array $userids): array { |
| 95 | global $DB; |
| 96 | $where = []; |
| 97 | $params = []; |
| 98 | foreach (array_merge([$t['owner']], $t['actors']) as $f) { |
| 99 | [$in, $p] = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED); |
| 100 | $where[] = "t.$f $in"; |
| 101 | $params += $p; |
| 102 | } |
| 103 | return ['(' . implode(' OR ', $where) . ')', $params]; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Contexts holding data about the user. |
| 108 | * |
| 109 | * @param int $userid |
| 110 | * @return contextlist |
| 111 | */ |
| 112 | public static function get_contexts_for_userid(int $userid): contextlist { |
| 113 | global $DB; |
| 114 | $list = new contextlist(); |
| 115 | foreach (self::TABLES as $table => $t) { |
| 116 | [$where, $params] = self::user_where($t, [$userid]); |
| 117 | if ($t['instance'] === null) { |
| 118 | if ($DB->record_exists_sql("SELECT 1 FROM {{$table}} t WHERE $where", $params)) { |
| 119 | $list->add_system_context(); |
| 120 | } |
| 121 | continue; |
| 122 | } |
| 123 | $params['lvl'] = $t['level']; |
| 124 | $list->add_from_sql( |
| 125 | "SELECT ctx.id FROM {{$table}} t |
| 126 | JOIN {context} ctx ON ctx.instanceid = t.{$t['instance']} AND ctx.contextlevel = :lvl |
| 127 | WHERE $where", |
| 128 | $params |
| 129 | ); |
| 130 | } |
| 131 | return $list; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Users with data in a context. |
| 136 | * |
| 137 | * @param userlist $userlist |
| 138 | */ |
| 139 | public static function get_users_in_context(userlist $userlist) { |
| 140 | $ctx = $userlist->get_context(); |
| 141 | foreach (self::TABLES as $table => $t) { |
| 142 | if ($ctx->contextlevel != $t['level']) { |
| 143 | continue; |
| 144 | } |
| 145 | foreach (array_merge([$t['owner']], $t['actors']) as $f) { |
| 146 | $sql = "SELECT $f FROM {{$table}} WHERE $f > 0"; |
| 147 | $params = []; |
| 148 | if ($t['instance'] !== null) { |
| 149 | $sql .= " AND {$t['instance']} = :i"; |
| 150 | $params['i'] = $ctx->instanceid; |
| 151 | } |
| 152 | $userlist->add_from_sql($f, $sql, $params); |
| 153 | } |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Export the user's rows, one file per row. |
| 159 | * |
| 160 | * @param approved_contextlist $contextlist |
| 161 | */ |
| 162 | public static function export_user_data(approved_contextlist $contextlist) { |
| 163 | global $DB; |
| 164 | $userid = (int) $contextlist->get_user()->id; |
| 165 | foreach ($contextlist->get_contexts() as $ctx) { |
| 166 | foreach (self::TABLES as $table => $t) { |
| 167 | if ($ctx->contextlevel != $t['level']) { |
| 168 | continue; |
| 169 | } |
| 170 | [$where, $params] = self::user_where($t, [$userid]); |
| 171 | if ($t['instance'] !== null) { |
| 172 | $where .= " AND t.{$t['instance']} = :i"; |
| 173 | $params['i'] = $ctx->instanceid; |
| 174 | } |
| 175 | $rows = $DB->get_records_sql("SELECT t.* FROM {{$table}} t WHERE $where ORDER BY t.id", $params); |
| 176 | foreach ($rows as $r) { |
| 177 | $data = []; |
| 178 | foreach ($t['fields'] as $f) { |
| 179 | $data[$f] = (strpos($f, 'time') === 0 && $r->$f) ? transform::datetime($r->$f) : $r->$f; |
| 180 | } |
| 181 | writer::with_context($ctx)->export_data( |
| 182 | [get_string('pluginname', 'local_atrisk'), $t['key'], $r->id], |
| 183 | (object) $data |
| 184 | ); |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Delete everything in a context. |
| 192 | * |
| 193 | * @param \context $context |
| 194 | */ |
| 195 | public static function delete_data_for_all_users_in_context(\context $context) { |
| 196 | global $DB; |
| 197 | foreach (self::TABLES as $table => $t) { |
| 198 | if ($context->contextlevel != $t['level']) { |
| 199 | continue; |
| 200 | } |
| 201 | if ($t['instance'] === null) { |
| 202 | $DB->delete_records($table); |
| 203 | } else { |
| 204 | $DB->delete_records($table, [$t['instance'] => $context->instanceid]); |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Delete one user's data in the approved contexts. |
| 211 | * |
| 212 | * @param approved_contextlist $contextlist |
| 213 | */ |
| 214 | public static function delete_data_for_user(approved_contextlist $contextlist) { |
| 215 | $userid = (int) $contextlist->get_user()->id; |
| 216 | foreach ($contextlist->get_contexts() as $ctx) { |
| 217 | self::delete_users($ctx, [$userid]); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Delete several users' data in one context. |
| 223 | * |
| 224 | * @param approved_userlist $userlist |
| 225 | */ |
| 226 | public static function delete_data_for_users(approved_userlist $userlist) { |
| 227 | self::delete_users($userlist->get_context(), $userlist->get_userids()); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Owners lose their rows; actors lose only their id on other people's rows. |
| 232 | * |
| 233 | * @param \context $ctx |
| 234 | * @param int[] $userids |
| 235 | */ |
| 236 | private static function delete_users(\context $ctx, array $userids): void { |
| 237 | global $DB; |
| 238 | if (!$userids) { |
| 239 | return; |
| 240 | } |
| 241 | foreach (self::TABLES as $table => $t) { |
| 242 | if ($ctx->contextlevel != $t['level']) { |
| 243 | continue; |
| 244 | } |
| 245 | $scope = ''; |
| 246 | $scopeparams = []; |
| 247 | if ($t['instance'] !== null) { |
| 248 | $scope = " AND {$t['instance']} = :i"; |
| 249 | $scopeparams['i'] = $ctx->instanceid; |
| 250 | } |
| 251 | [$in, $params] = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED); |
| 252 | $DB->delete_records_select($table, "{$t['owner']} $in" . $scope, $params + $scopeparams); |
| 253 | foreach ($t['actors'] as $f) { |
| 254 | [$in, $params] = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED); |
| 255 | $DB->set_field_select($table, $f, 0, "$f $in" . $scope, $params + $scopeparams); |
| 256 | } |
| 257 | } |
| 258 | } |
| 259 | } |