456 lines
9.1 KiB
PHP
Executable File
456 lines
9.1 KiB
PHP
Executable File
#!/usr/bin/php
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<?php
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require_once __DIR__.'/../../include/php/const';
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$f_auth;
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$f_gstate;
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$f_accesslog;
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$f_actions;
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$actions = [];
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$last_user = null;
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$timeout = 0;
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/* RETURN CURRENT GLOBAL STATE
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*
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* @return gstate<string> Current global state as string
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*
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*/
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function get_gstate(){
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/* (1) Export global file descriptor */
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global $f_gstate;
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/* (2) Read first line */
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$f_gstate->seek(0);
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$state = $f_gstate->current();
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$state = preg_replace('@^\s+@', '', $state);
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$state = preg_replace('@\s+$@', '', $state);
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/* (3) Check data */
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if( strlen($state) < 1 )
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return false;
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/* (4) Return global state */
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return $state;
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}
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/* RETURNS THE PERMISSIONS FOR A SPECIFIC CODE AND AN ACTION
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*
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* @code<string> Some RFID code
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*
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* @return user<array> User info if found ; else NULL
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*
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*/
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function auth($code){
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global $f_auth;
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/* (1) Goto first line */
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$f_auth->seek(0);
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/* (2) Parse each line */
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while( !$f_auth->eof() ){
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/* (3) Try to parse line */
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$parsed = json_decode($f_auth->fgets(), true);
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/* (3) Ignore if parse error */
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if( is_null($parsed) )
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continue;
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/* (4) If wrong code -> go to next */
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if( $parsed[0] != $code )
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continue;
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/* (5) return user info */
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return [
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'id' => $parsed[1],
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'can' => $parsed[2]
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];
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}
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/* (6) Return FALSE if not found */
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return null;
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}
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/* PROCESS ACTIONS IF ACTION CAN BE PERFORMED BY USER (DEPENDING ON TIMEOUT/STATE)
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*
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* @user<array> Current user information
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*
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* @return success<bool> If success (action performed) | FALSE
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*
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*/
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function act($user){
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/* [1] Export global caches + variables
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=========================================================*/
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/* (1) Variables */
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global $timeout;
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/* (2) Caches */
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global $actions;
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/* (3) Log history file descriptor */
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global $f_accesslog;
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/* (5) Update global state */
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global $f_gstate;
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$state = get_gstate();
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// manage error
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if( $state === false )
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return false;
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/* [2] Manage timeout
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=========================================================*/
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/* (1) If no action for this @timeout -> reset to 0 */
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if( !isset($actions[$timeout]) || !is_array($actions[$timeout]) )
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$timeout = 0;
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/* (2) fetch actions for the current @timeout */
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$actionlist = $actions[$timeout];
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/* [3] Manage permissions (action that can be performed)
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=========================================================*/
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/* (1) Will contain available @id_action-s granted for the user */
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$grantedFor = [];
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/* (2) Search an action the user can perform in the list */
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foreach($actionlist as $id_action=>$acttion){
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/* (3) If have permission -> add to list */
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if( in_array($id_action, $user['can']) )
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$grantedFor[] = $id_action;
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}
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/* (4) If no action found -> abort */
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if( count($grantedFor) == 0 ){
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slog('user not granted to any action', 'mfrc522:loop');
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return false;
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}
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/* [4] Manage action depending on the actual STATE
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=========================================================*/
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/* (1) Will contain the first available action depending on STATE */
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$toPerform = null;
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/* (2) For each granted action, check the STATE */
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foreach($grantedFor as $id_action){
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$failed = false;
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/* (3) Fetch action data */
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$action = $actionlist[$id_action];
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/* (4) Check if the state allows the action to be performed */
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for( $c = 0 ; $c < strlen($state) || $c < strlen($action['prev']) ; $c++ ){
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// {1} 'X' = any state -> so ignore //
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if( $action['prev'][$c] == 'X' )
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continue;
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// {2} Other state : if not equal -> set as FAILED //
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else if( $action['prev'][$c] != $state[$c] ){
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$failed = true;
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break;
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}
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}
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/* (5) If not failed -> save action in @toPerform */
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if( !$failed ){
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$toPerform = $id_action;
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break;
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}
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}
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/* (6) If no action cant be performed -> abort */
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if( is_null($toPerform) ){
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slog('global state allows no action to be performed', 'mfrc522:loop');
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return false;
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}
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/* (7) Extract corresponding action */
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$action = $grantedFor[$toPerform];
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/* [5] Process the action on the STATE
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=========================================================*/
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/* (1) Update the state with the found action */
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for( $c = 0 ; $c < strlen($state) || $c < strlen($action['next']) ; $c++ ){
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// {1} If 'x' -> let the current state //
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if( $action['next'][$c] == 'X' )
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continue;
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// {2} If other state -> update it //
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else
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$state[$c] = $action['next'][$c];
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}
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/* (2) Update the state file */
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$f_gstate->seek(0);
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$written = $f_gstate->fwrite($state);
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/* (3) Manage error */
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if( $written === false )
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slog('cannot update STATE file', 'mfrc522:loop');
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/* [6] Log action
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=========================================================*/
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/* (1) Log action to default log file */
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$f_accesslog->fwrite( json_encode([
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time(),
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$user['id'],
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$toPerform
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]).PHP_EOL );
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/* (2) Return status */
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return true;
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}
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function mfrc522_setup(){
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/* [0] Initialize global variables
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=========================================================*/
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/* (1) File descriptiors */
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global $f_auth, $f_accesslog, $f_gstate;
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/* (2) Caches */
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global $actions;
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/* [1] Open file descriptors on useful files
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=========================================================*/
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/* (1) Read accesses */
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$f_auth = new SplFileObject(AUTH_CONF, 'r');
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$f_actions = new SplFileObject(ACTIONS_CONF, 'r');
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$f_gstate = new SplFileObject(STATE_CONF, 'r+');
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/* (2) Append accesses (logs) */
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$f_accesslog = new SplFileObject(DEFAULT_DATA, 'a');
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/* [2] Parse ACTIONS and cache them
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=========================================================*/
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/* (1) Parse each line */
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while( !$f_actions->eof() ){
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/* (2) Try to parse line */
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$parsed = json_decode($f_actions->fgets(), true);
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/* (2) Ignore if parse error */
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if( is_null($parsed) )
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continue;
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/* (3) Add key (timeout) to cache */
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if( !isset($actions[$parsed[0]]) )
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$actions[$parsed[0]] = [];
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/* (4) Add entry to cache */
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$actions[$parsed[0]][$parsed[1]] = [
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'prev' => $parsed[2],
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'next' => $parsed[3]
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];
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}
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/* (5) Free file descriptor */
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$f_actions = null;
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/* [3] Check global state
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=========================================================*/
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/* (1) Check file */
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$gstate = get_gstate();
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/* (2) Manage error */
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if( $gstate === false )
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return 127;
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return 0;
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}
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function mfrc522_loop(){
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/* [1] Load global variables
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=========================================================*/
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/* (1) Persistent variabes */
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global $last_user;
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global $timeout;
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/* (2) Caches */
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global $actions;
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/* (3) Get global state */
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$gstate = get_gstate();
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// Manage error
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if( $gstate === false )
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return false;
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/* [1] Wait for rfid card
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=========================================================*/
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/* (1) Read card */
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$code = syscall(SOURCE_DIR.'/lib/mfrc522/read');
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/* (2) If no card read -> reset @last_user / @timeout + abort */
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if( $code === false ){
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$last_user = null;
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$timeout = 0;
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return false;
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}
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/* (3) If code -> format it */
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$code = strtoupper($code);
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slog("card '$code' read", 'mfrc522:read');
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/* [2] Check for user in auth list
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=========================================================*/
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/* (1) Check user for this code */
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$user = auth($code);
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/* (2) If not found -> reset @last_user / @timeout + abort */
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if( is_null($user) ){
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slog("Unknown user (not authenticated)", "mfrc522:loop");
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$last_user = null;
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$timeout = 0;
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return false;
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}
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/* [3] Manage @timeout incrementation + @last_user
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=========================================================*/
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/* (1) If same as last -> increment @timeout */
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if( $last_user == $user['id'] )
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$timeout++;
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/* (2) If different -> reset @timeout to 0 */
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else
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$timeout = 0;
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/* [4] Manage action
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=========================================================*/
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/* (1) Try to process action */
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$performed = act($user);
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/* (2) If performed -> update chip according to new state */
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if( $performed ){
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// {1} Try to update state //
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$updateds = syscall(SOURCE_DIR.'/lib/global-state/update');
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// {2} If not updated -> error //
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if( !$updateds )
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slog("Cannot update chips to '{$gstate}'", 'mfrc522:loop');
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// {3} If updated -> success //
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else
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slog("Chips updated to '{$gstate}'", 'mfrc522:loop');
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/* (3) If not performed -> log error */
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}else
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slog("Cannot perform action by '$code' at timeout $timeout", 'mfrc522:loop');
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/* (4) Store user for next loop */
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$last_user = $user['id'];
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}
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/* [1] Set up daemon
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=========================================================*/
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/* (1) Set up */
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$exec = mfrc522_setup();
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/* (2) Manage error */
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if( $exec != 0 ){
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slog('cannot set up the daemon', 'mfrc522:loop');
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echo $exec;
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die($exec);
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}
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/* (3) Success message */
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slog('daemon started (loop)', 'mfrc522:loop');
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/* [2] Daemon loop
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=========================================================*/
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while( true ){
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$start_ts = microtime(true);
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mfrc522_loop();
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while( microtime(true) - $start_ts < 0.5 );
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}
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?>
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