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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 | namespace local_integritycase\local; |
| 18 | |
| 19 | use context_course; |
| 20 | use core_user; |
| 21 | use local_integritycase\event\case_created; |
| 22 | use local_integritycase\event\case_updated; |
| 23 | use moodle_exception; |
| 24 | use moodle_url; |
| 25 | use stdClass; |
| 26 | |
| 27 | /** |
| 28 | * Opens cases and moves them through the workflow, keeping an audit trail of every action. |
| 29 | * |
| 30 | * Every write checks the capability of the current user and records an event row. Pages call these |
| 31 | * methods; they never write to the tables themselves. |
| 32 | * |
| 33 | * @package local_integritycase |
| 34 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 35 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 36 | */ |
| 37 | final class case_manager { |
| 38 | /** @var string Case table. */ |
| 39 | public const TABLE = 'local_integritycase'; |
| 40 | /** @var string Audit trail table. */ |
| 41 | public const EVENTS = 'local_integritycase_event'; |
| 42 | |
| 43 | /** |
| 44 | * Open a case about a student in a course. |
| 45 | * |
| 46 | * @param int $courseid |
| 47 | * @param int $studentid Must be enrolled in the course. |
| 48 | * @param string $summary What was found, plain text. |
| 49 | * @param int $cmid Related activity in the course, 0 for none. |
| 50 | * @param int|null $handlerid Staff member handling it; the current user when null. |
| 51 | * @return stdClass The case. |
| 52 | */ |
| 53 | public static function open(int $courseid, int $studentid, string $summary, int $cmid = 0, ?int $handlerid = null): stdClass { |
| 54 | global $DB, $USER; |
| 55 | $context = context_course::instance($courseid); |
| 56 | require_capability('local/integritycase:manage', $context); |
| 57 | if (!is_enrolled($context, $studentid)) { |
| 58 | throw new moodle_exception('error:notenrolled', 'local_integritycase'); |
| 59 | } |
| 60 | if ($cmid && !$DB->record_exists('course_modules', ['id' => $cmid, 'course' => $courseid])) { |
| 61 | throw new moodle_exception('error:cmnotincourse', 'local_integritycase'); |
| 62 | } |
| 63 | $handlerid = $handlerid ?? (int) $USER->id; |
| 64 | if (!has_capability('local/integritycase:manage', $context, $handlerid)) { |
| 65 | throw new moodle_exception('error:handlernotstaff', 'local_integritycase'); |
| 66 | } |
| 67 | $now = time(); |
| 68 | $id = (int) $DB->insert_record(self::TABLE, (object) [ |
| 69 | 'courseid' => $courseid, |
| 70 | 'studentid' => $studentid, |
| 71 | 'cmid' => $cmid, |
| 72 | 'handlerid' => $handlerid, |
| 73 | 'createdby' => $USER->id, |
| 74 | 'summary' => $summary, |
| 75 | 'summaryformat' => FORMAT_PLAIN, |
| 76 | 'stage' => workflow::REPORTED, |
| 77 | 'outcome' => null, |
| 78 | 'studentvisible' => 0, |
| 79 | 'timecreated' => $now, |
| 80 | 'timemodified' => $now, |
| 81 | 'timeclosed' => 0, |
| 82 | ]); |
| 83 | self::record($id, 'created', null, workflow::REPORTED, null, null, false); |
| 84 | case_created::create([ |
| 85 | 'objectid' => $id, |
| 86 | 'context' => $context, |
| 87 | 'relateduserid' => $studentid, |
| 88 | ])->trigger(); |
| 89 | return self::get($id); |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Move a case to another stage. Staff only. |
| 94 | * |
| 95 | * Reaching "awaiting response" or "decided" makes the case visible to the student, who is then |
| 96 | * told about every later move. A move into "decided" needs an outcome; moving back to |
| 97 | * "investigating" clears it until a new decision is made. |
| 98 | * |
| 99 | * @param int $caseid |
| 100 | * @param string $to |
| 101 | * @param string $note Shown to the student once the case is visible. |
| 102 | * @param string|null $outcome Required when $to is "decided". |
| 103 | * @return stdClass The updated case. |
| 104 | */ |
| 105 | public static function move(int $caseid, string $to, string $note = '', ?string $outcome = null): stdClass { |
| 106 | global $DB; |
| 107 | $case = self::get($caseid); |
| 108 | $context = context_course::instance($case->courseid); |
| 109 | require_capability('local/integritycase:manage', $context); |
| 110 | if (!workflow::can_move($case->stage, $to)) { |
| 111 | throw new moodle_exception('error:nomove', 'local_integritycase', '', (object) [ |
| 112 | 'from' => self::stage_name($case->stage), |
| 113 | 'to' => self::stage_name($to), |
| 114 | ]); |
| 115 | } |
| 116 | if ($to === workflow::DECIDED && ($outcome === null || !workflow::is_outcome($outcome))) { |
| 117 | throw new moodle_exception('outcomerequired', 'local_integritycase'); |
| 118 | } |
| 119 | |
| 120 | $from = $case->stage; |
| 121 | $case->stage = $to; |
| 122 | if ($to === workflow::DECIDED) { |
| 123 | $case->outcome = $outcome; |
| 124 | } else if ($to === workflow::INVESTIGATING) { |
| 125 | $case->outcome = null; |
| 126 | } |
| 127 | $case->studentvisible = (int) $case->studentvisible || workflow::reveals($to) ? 1 : 0; |
| 128 | $case->timeclosed = $to === workflow::CLOSED ? time() : 0; |
| 129 | $case->timemodified = time(); |
| 130 | $DB->update_record(self::TABLE, $case); |
| 131 | |
| 132 | $visible = (bool) $case->studentvisible; |
| 133 | self::record($caseid, 'stage', $from, $to, $case->outcome, $note, $visible); |
| 134 | self::log($case, $context); |
| 135 | if ($visible) { |
| 136 | self::notify_student($case, $note); |
| 137 | } |
| 138 | return self::get($caseid); |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Add a note only staff can see. |
| 143 | * |
| 144 | * @param int $caseid |
| 145 | * @param string $note |
| 146 | */ |
| 147 | public static function add_note(int $caseid, string $note): void { |
| 148 | $case = self::get($caseid); |
| 149 | $context = context_course::instance($case->courseid); |
| 150 | require_capability('local/integritycase:manage', $context); |
| 151 | self::record($caseid, 'note', null, null, null, $note, false); |
| 152 | self::log($case, $context); |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Replace the case's evidence files with those in a draft area. Staff only, logged privately. |
| 157 | * |
| 158 | * @param int $caseid |
| 159 | * @param int $draftitemid |
| 160 | */ |
| 161 | public static function save_evidence(int $caseid, int $draftitemid): void { |
| 162 | $case = self::get($caseid); |
| 163 | $context = context_course::instance($case->courseid); |
| 164 | require_capability('local/integritycase:manage', $context); |
| 165 | file_save_draft_area_files( |
| 166 | $draftitemid, |
| 167 | $context->id, |
| 168 | 'local_integritycase', |
| 169 | 'evidence', |
| 170 | $caseid, |
| 171 | ['subdirs' => 0, 'maxfiles' => 20] |
| 172 | ); |
| 173 | self::record($caseid, 'evidence', null, null, null, null, false); |
| 174 | self::log($case, $context); |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * The student gives their side while the case awaits it. The handler is told. |
| 179 | * |
| 180 | * @param int $caseid |
| 181 | * @param string $text |
| 182 | */ |
| 183 | public static function respond(int $caseid, string $text): void { |
| 184 | $case = self::student_case($caseid, workflow::AWAITING); |
| 185 | self::record($caseid, 'response', null, null, null, $text, true); |
| 186 | self::touch($case); |
| 187 | self::notify_handler($case, 'response'); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * The student appeals a decision. The case moves to "appealed" and the handler is told. |
| 192 | * |
| 193 | * @param int $caseid |
| 194 | * @param string $reason |
| 195 | * @return stdClass The updated case. |
| 196 | */ |
| 197 | public static function appeal(int $caseid, string $reason): stdClass { |
| 198 | global $DB; |
| 199 | $case = self::student_case($caseid, workflow::DECIDED); |
| 200 | $DB->set_field(self::TABLE, 'stage', workflow::APPEALED, ['id' => $caseid]); |
| 201 | $case->stage = workflow::APPEALED; |
| 202 | self::record($caseid, 'appeal', workflow::DECIDED, workflow::APPEALED, null, $reason, true); |
| 203 | self::touch($case); |
| 204 | self::notify_handler($case, 'appeal'); |
| 205 | return self::get($caseid); |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Load a case. |
| 210 | * |
| 211 | * @param int $caseid |
| 212 | * @return stdClass |
| 213 | */ |
| 214 | public static function get(int $caseid): stdClass { |
| 215 | global $DB; |
| 216 | return $DB->get_record(self::TABLE, ['id' => $caseid], '*', MUST_EXIST); |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * The audit trail, oldest first. |
| 221 | * |
| 222 | * @param stdClass $case |
| 223 | * @param bool $forstudent Only what the student may see. |
| 224 | * @return stdClass[] |
| 225 | */ |
| 226 | public static function events(stdClass $case, bool $forstudent): array { |
| 227 | global $DB; |
| 228 | $conditions = ['caseid' => $case->id]; |
| 229 | if ($forstudent) { |
| 230 | $conditions['visibletostudent'] = 1; |
| 231 | } |
| 232 | return array_values($DB->get_records(self::EVENTS, $conditions, 'timecreated ASC, id ASC')); |
| 233 | } |
| 234 | |
| 235 | /** |
| 236 | * All cases in a course, most recently changed first. Callers check local/integritycase:view. |
| 237 | * |
| 238 | * @param int $courseid |
| 239 | * @return stdClass[] Keyed by id. |
| 240 | */ |
| 241 | public static function for_course(int $courseid): array { |
| 242 | global $DB; |
| 243 | return $DB->get_records(self::TABLE, ['courseid' => $courseid], 'timemodified DESC, id DESC'); |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | * The cases a student can see in a course. |
| 248 | * |
| 249 | * @param int $courseid |
| 250 | * @param int $studentid |
| 251 | * @return stdClass[] Keyed by id. |
| 252 | */ |
| 253 | public static function for_student(int $courseid, int $studentid): array { |
| 254 | global $DB; |
| 255 | return $DB->get_records( |
| 256 | self::TABLE, |
| 257 | ['courseid' => $courseid, 'studentid' => $studentid, 'studentvisible' => 1], |
| 258 | 'timemodified DESC, id DESC' |
| 259 | ); |
| 260 | } |
| 261 | |
| 262 | /** |
| 263 | * Whether the current user may see this case: staff with view, or the student once it is visible. |
| 264 | * |
| 265 | * @param stdClass $case |
| 266 | * @return bool |
| 267 | */ |
| 268 | public static function can_view(stdClass $case): bool { |
| 269 | global $USER; |
| 270 | $context = context_course::instance($case->courseid); |
| 271 | if (has_capability('local/integritycase:view', $context)) { |
| 272 | return true; |
| 273 | } |
| 274 | return (int) $case->studentid === (int) $USER->id && $case->studentvisible |
| 275 | && has_capability('local/integritycase:respond', $context); |
| 276 | } |
| 277 | |
| 278 | /** |
| 279 | * Human name of a stage. |
| 280 | * |
| 281 | * @param string $stage |
| 282 | * @return string |
| 283 | */ |
| 284 | public static function stage_name(string $stage): string { |
| 285 | return get_string_manager()->string_exists("stage:$stage", 'local_integritycase') |
| 286 | ? get_string("stage:$stage", 'local_integritycase') : $stage; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Load the current user's own visible case at the given stage, or fail. |
| 291 | * |
| 292 | * @param int $caseid |
| 293 | * @param string $stage |
| 294 | * @return stdClass |
| 295 | */ |
| 296 | private static function student_case(int $caseid, string $stage): stdClass { |
| 297 | global $USER; |
| 298 | $case = self::get($caseid); |
| 299 | require_capability('local/integritycase:respond', context_course::instance($case->courseid)); |
| 300 | if ((int) $case->studentid !== (int) $USER->id || !$case->studentvisible) { |
| 301 | throw new moodle_exception('error:notyourcase', 'local_integritycase'); |
| 302 | } |
| 303 | if ($case->stage !== $stage) { |
| 304 | throw new moodle_exception('error:wrongstage', 'local_integritycase', '', self::stage_name($case->stage)); |
| 305 | } |
| 306 | return $case; |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * Write an audit trail row. |
| 311 | * |
| 312 | * @param int $caseid |
| 313 | * @param string $action created, stage, note, response or appeal. |
| 314 | * @param string|null $from |
| 315 | * @param string|null $to |
| 316 | * @param string|null $outcome |
| 317 | * @param string|null $note |
| 318 | * @param bool $visible Whether the student may see it. |
| 319 | */ |
| 320 | private static function record( |
| 321 | int $caseid, |
| 322 | string $action, |
| 323 | ?string $from, |
| 324 | ?string $to, |
| 325 | ?string $outcome, |
| 326 | ?string $note, |
| 327 | bool $visible |
| 328 | ): void { |
| 329 | global $DB, $USER; |
| 330 | $DB->insert_record(self::EVENTS, (object) [ |
| 331 | 'caseid' => $caseid, |
| 332 | 'userid' => $USER->id, |
| 333 | 'action' => $action, |
| 334 | 'fromstage' => $from, |
| 335 | 'tostage' => $to, |
| 336 | 'outcome' => $outcome, |
| 337 | 'note' => $note === '' ? null : $note, |
| 338 | 'noteformat' => FORMAT_PLAIN, |
| 339 | 'visibletostudent' => $visible ? 1 : 0, |
| 340 | 'timecreated' => time(), |
| 341 | ]); |
| 342 | } |
| 343 | |
| 344 | /** |
| 345 | * Mark a case as changed and log it. |
| 346 | * |
| 347 | * @param stdClass $case |
| 348 | */ |
| 349 | private static function touch(stdClass $case): void { |
| 350 | global $DB; |
| 351 | $DB->set_field(self::TABLE, 'timemodified', time(), ['id' => $case->id]); |
| 352 | self::log($case, context_course::instance($case->courseid)); |
| 353 | } |
| 354 | |
| 355 | /** |
| 356 | * Trigger the case updated log event. |
| 357 | * |
| 358 | * @param stdClass $case |
| 359 | * @param context_course $context |
| 360 | */ |
| 361 | private static function log(stdClass $case, context_course $context): void { |
| 362 | case_updated::create([ |
| 363 | 'objectid' => $case->id, |
| 364 | 'context' => $context, |
| 365 | 'relateduserid' => $case->studentid, |
| 366 | 'other' => ['stage' => $case->stage], |
| 367 | ])->trigger(); |
| 368 | } |
| 369 | |
| 370 | /** |
| 371 | * Tell the student where their case is now. |
| 372 | * |
| 373 | * @param stdClass $case |
| 374 | * @param string $note |
| 375 | */ |
| 376 | private static function notify_student(stdClass $case, string $note): void { |
| 377 | $course = get_course($case->courseid); |
| 378 | $coursename = format_string($course->fullname, true, ['context' => context_course::instance($course->id)]); |
| 379 | $stage = self::stage_name($case->stage); |
| 380 | if ($case->outcome && in_array($case->stage, [workflow::DECIDED, workflow::CLOSED], true)) { |
| 381 | $stage .= ' (' . get_string('outcome:' . $case->outcome, 'local_integritycase') . ')'; |
| 382 | } |
| 383 | $text = get_string('message:student', 'local_integritycase', (object) ['course' => $coursename, 'stage' => $stage]); |
| 384 | if ($note !== '') { |
| 385 | $text .= "\n\n" . $note; |
| 386 | } |
| 387 | self::send( |
| 388 | $case, |
| 389 | 'casestudent', |
| 390 | (int) $case->studentid, |
| 391 | get_string('message:subject:student', 'local_integritycase', $coursename), |
| 392 | $text |
| 393 | ); |
| 394 | } |
| 395 | |
| 396 | /** |
| 397 | * Tell the handler the student responded or appealed. |
| 398 | * |
| 399 | * @param stdClass $case |
| 400 | * @param string $what response or appeal. |
| 401 | */ |
| 402 | private static function notify_handler(stdClass $case, string $what): void { |
| 403 | $course = get_course($case->courseid); |
| 404 | $student = fullname(core_user::get_user($case->studentid)); |
| 405 | $a = (object) [ |
| 406 | 'student' => $student, |
| 407 | 'course' => format_string($course->fullname, true, ['context' => context_course::instance($course->id)]), |
| 408 | ]; |
| 409 | self::send( |
| 410 | $case, |
| 411 | 'casehandler', |
| 412 | (int) $case->handlerid, |
| 413 | get_string('message:subject:handler', 'local_integritycase', $student), |
| 414 | get_string("message:handler:$what", 'local_integritycase', $a) |
| 415 | ); |
| 416 | } |
| 417 | |
| 418 | /** |
| 419 | * Send a notification about a case. |
| 420 | * |
| 421 | * @param stdClass $case |
| 422 | * @param string $provider |
| 423 | * @param int $userid |
| 424 | * @param string $subject |
| 425 | * @param string $text Plain text. |
| 426 | */ |
| 427 | private static function send(stdClass $case, string $provider, int $userid, string $subject, string $text): void { |
| 428 | $url = new moodle_url('/local/integritycase/view.php', ['id' => $case->id]); |
| 429 | $message = new \core\message\message(); |
| 430 | $message->component = 'local_integritycase'; |
| 431 | $message->name = $provider; |
| 432 | $message->userfrom = core_user::get_noreply_user(); |
| 433 | $message->userto = $userid; |
| 434 | $message->subject = $subject; |
| 435 | $message->fullmessage = $text; |
| 436 | $message->fullmessageformat = FORMAT_PLAIN; |
| 437 | $message->fullmessagehtml = text_to_html(s($text), false, false, true); |
| 438 | $message->smallmessage = $subject; |
| 439 | $message->notification = 1; |
| 440 | $message->contexturl = $url->out(false); |
| 441 | $message->contexturlname = get_string('pluginname', 'local_integritycase'); |
| 442 | $message->courseid = $case->courseid; |
| 443 | message_send($message); |
| 444 | } |
| 445 | } |