source: admin/WebConsole/rest/server.php @ 213a832

<?php
/**
 * @file    index.php
 * @brief   OpenGnsys Server REST API manager.
 * @warning All input and output messages are formatted in JSON.
 * @note    Some ideas are based on article "How to create REST API for Android app using PHP, Slim and MySQL" by Ravi Tamada, thanx.
 * @license GNU GPLv3+
 * @author  Ramón M. Gómez, ETSII Univ. Sevilla
 * @version 1.1.0 - First version
 * @date    2016-09-19
 */


// Auxiliar functions.

/**
 * @brief    Check if user is administrator and print error messages if not.
 * @param    int adminid   Administrator id.
 * @return   boolean       "true" if admin id. is equals to global user id., otherwise "false".
 */
function checkAdmin($adminid) {
        global $userid;

        if ($adminid == $userid) {
                return true;
        } else {
                // Print error message.
                $response['message'] = 'Cannot access this resource';
                jsonResponse(401, $response);
                return false;
        }
}

/**
 * @fn    addClassroomGroup(&$classroomGroups, $rs)
 * @brief Funcion privada usada para añadir grupos de aulas recursivamente
 * @param classroomGroups Grupos de aulas que pueden contener más grupos
 * @param rs resultset de la consulta a la base de datos.
 */
function addClassroomGroup(&$classroomGroups, $rs){

        array_walk($classroomGroups, function(&$group,$key){
                global $rs;
                if (isset($group['id']) && $group['id'] === $rs->campos["group_group_id"]) {
                        array_push($group["classroomGroups"],array("id" => $rs->campos["group_id"], 
                                "name" => $rs->campos["nombregrupoordenador"], 
                                "comments" => $rs->campos["comentarios"],
                                "classroomGroups" => array()));
                }
                else if(count($group["classroomGroups"]) > 0){
                        addClassroomGroup($group["classroomGroups"], $rs);
                }
                /**/
        });
}


// REST routes.

/**
 * @brief    user login.
 * @note     Route: /login, Method: POST
 * @param    string username   User name.
 * @param    string password   User password.
 * @return   string            JSON response with user id. and API key.
 * @note     User's API key is stored in a new field of "usuarios" table.
 */
$app->post('/login',
    function() use ($app) {
        global $cmd;
        global $userid;

        $response = Array();
        // Reading JSON parameters.
        try {
                $input = json_decode($app->request()->getBody());
                $user = htmlspecialchars($input->username);
                $pass = htmlspecialchars($input->password);
        } catch (Exception $e) {
                // Error message.
                $response["message"] = $e->getMessage();
                jsonResponse(400, $response);
                $app->stop();
        }

        // Checking parameters. 
        if (! empty($user) and ! empty($pass)) {
                // Database query.
                $cmd->texto = "SELECT idusuario, apikey
                                 FROM usuarios
                                WHERE usuario='$user' AND pasguor='$pass'";
                $rs=new Recordset;
                $rs->Comando=&$cmd;
                if ($rs->Abrir()) {
                        $rs->Primero();
                        if (!$rs->EOF){
                                // JSON response.
                                $userid=$rs->campos["idusuario"];
                                $apikey=$rs->campos["apikey"];
                                $response['userid'] = $userid;
                                $response['apikey'] = $apikey;
                                jsonResponse(200, $response);
                        } else {
                                // Credentials error.
                                $response['message'] = 'Login failed. Incorrect credentials';
                                jsonResponse(401, $response);
                                $app->stop();
                        }
                        $rs->Cerrar();
                } else {
                        // Access error.
                        $response['message'] = "An error occurred. Please try again";
                        jsonResponse(500, $response);
                        $app->stop();
                }
        } else {
                # Error: missing some input parameter.
                $response['message'] = 'Missing username or password';
                jsonResponse(400, $response);
                $app->stop();
        }
    }
);

/**
 * @brief    List all defined Organizational Units
 * @note     Route: /ous, Method: GET
 * @param    no
 * @return   JSON array with id. and name for every defined OU
 */
$app->get('/ous(/)', function() {
        global $cmd;

        $cmd->texto = "SELECT * FROM centros";
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $response = Array();
        $rs->Primero();
        while (!$rs->EOF) {
                $tmp = Array();
                $tmp['id'] = $rs->campos["idcentro"];
                $tmp['name'] = $rs->campos["nombrecentro"];
                array_push($response, $tmp);
                $rs->Siguiente();
        }
        $rs->Cerrar(); 
        jsonResponse(200, $response);
   } 
);

/**
 * @brief    Get Organizational Unit data
 * @note     Route: /ous/id, Method: GET
 * @param    id      OU id.
 * @return   JSON string with OU's parameters
 */
$app->get('/ous/:ouid(/)', 'validateApiKey',
    function($ouid) {
        global $cmd;
        global $userid;

        $ouid = htmlspecialchars($ouid);
        // Show OU information if user is OU's admin.
        $cmd->texto = <<<EOD
SELECT *
  FROM centros
 RIGHT JOIN administradores_centros USING(idcentro)
 WHERE administradores_centros.idadministradorcentro = '$userid'
   AND centros.idcentro = '$ouid'
 LIMIT 1;
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        if (checkAdmin($rs->campos["idadministradorcentro"]) and
            checkParameter($rs->campos["idcentro"])) {
                $response['id'] = $ouid;
                $response['name'] = $rs->campos["nombrecentro"];
                $response['description'] = $rs->campos["comentarios"];
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    List group of labs in an Organizational Unit
 * @note     Route: /ous/id/groups, Method: GET
 * @param    id      OU id.
 * @return   JSON array of OU groups
 */
$app->get('/ous/:ouid/groups(/)', 'validateApiKey', function($ouid) {
        global $cmd;
        global $userid;

        $ouid = htmlspecialchars($ouid);
        // List group of labs if user is OU's admin.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, grupos.*
  FROM grupos
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND idcentro='$ouid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin.
        if (checkAdmin($rs->campos["idadministradorcentro"])) {
                $response = Array();
                // Read data.
                if (! is_null($rs->campos["idcentro"])) {
                        while (!$rs->EOF) {
                                $tmp = Array();
                                $tmp['id'] = $rs->campos["idgrupo"];
                                $tmp['name'] = $rs->campos["nombregrupo"];
                                $tmp['type'] = $rs->campos["tipo"];
                                $tmp['comments'] = $rs->campos["comentarios"];
                                if($rs->campos["grupoid"] != 0){
                                        $tmp['parent']['id'] = $rs->campos["grupoid"];
                                }
                                array_push($response, $tmp);
                                $rs->Siguiente();
                        }
                }
                jsonResponse(200, $response);
        }
        $rs->Cerrar();
    }
);

/**
 * @brief    List all labs defined in an OU
 * @note     Route: /ous/id/labs, Method: GET
 * @param    id      OU id.
 * @return   JSON array of all UO's labs data 
 */
$app->get('/ous/:ouid/labs(/)', 'validateApiKey',
    function($ouid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, aulas.*, grp.idgrupo AS group_id,
       grp.nombregrupoordenador, grp.grupoid AS group_group_id, grp.comentarios
  FROM aulas
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
  LEFT JOIN gruposordenadores AS grp USING(idaula)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid'
 ORDER BY aulas.idaula, grp.idgrupo
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error opening recordset.
        // Check if user is an UO admin.
        $rs->Primero();
        if (checkAdmin($rs->campos["idadministradorcentro"])) {
                $response = Array();
                if (! is_null($rs->campos["idcentro"])) {
                        while (!$rs->EOF) {
                                // En los resultados las aulas vienen repetidas tantas veces como grupos tengan, solo dejamos uno
                                $classroomIndex = -1;
                                $found=false;
                                $index = 0;
                                while(!$found && $index < count($response)){
                                        if(isset($response[$index]["id"]) && $response[$index]["id"] == $rs->campos["idaula"]){
                                                $classroomIndex = $index;
                                                $found = true;
                                        }
                                        $index++;
                                }
                                if(!$found){
                                        $tmp = Array();
                                        $tmp['id'] = $rs->campos["idaula"];
                                        $tmp['name'] = $rs->campos["nombreaula"];
                                        $tmp['inremotepc'] = $rs->campos["inremotepc"]==0 ? false: true;
                                        $tmp['group']['id'] = $rs->campos["grupoid"];
                                        $tmp['ou']['id'] = $ouid;
                                        array_push($response, $tmp);
                                }
                                else{
                                        // Le añadimos el grupo en cuestion siempre que no sea un subgrupo
                                        if($rs->campos["group_group_id"] == 0){
                                                array_push($response[$classroomIndex]['classroomGroups'],
                                                        array("id" => $rs->campos["group_id"],
                                                        "name" => $rs->campos["nombregrupoordenador"],
                                                        "comments" => $rs->campos["comentarios"],
                                                        "classroomGroups" => array()));
                                        }
                                        else {
                                                // Buscamos el grupo donde añadir el grupo
                                                addClassroomGroup($response[$classroomIndex]['classroomGroups'], $rs);
                                        }
                                }
                                $rs->Siguiente();
                        }
                }
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    Get lab data
 * @note     Route: /ous/id1/labs/id2, Method: GET
 * @param    id1     OU id.
 * @param    id2     lab id.
 * @return   JSON string with lab parameters
 */
$app->get('/ous/:ouid/labs/:labid(/)', 'validateApiKey',
    function($ouid, $labid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $labid = htmlspecialchars($labid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, COUNT(idordenador) AS defclients, aulas.*
  FROM aulas
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
  LEFT JOIN ordenadores USING(idaula)
 WHERE adm.idadministradorcentro = '$userid'
   AND idcentro='$ouid'
   AND idaula='$labid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and lab exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idaula"])) {
                $response['id'] = $rs->campos["idaula"];
                $response['name'] = $rs->campos["nombreaula"];
                $response['location'] = $rs->campos["ubicacion"];
                $response['description'] = $rs->campos["comentarios"];
                $response['inremotepc'] = $rs->campos["inremotepc"]==0 ? false: true;
                $response['capacity'] = $rs->campos["puestos"];
                $response['defclients'] = $rs->campos["defclients"];
                $response['projector'] = $rs->campos["cagnon"]==0 ? false: true;
                $response['board'] = $rs->campos["pizarra"]==0 ? false: true;
                $response['routerip'] = $rs->campos["router"];
                $response['netmask'] = $rs->campos["netmask"];
                $response['ntp'] = $rs->campos["ntp"];
                $response['dns'] = $rs->campos["dns"];
                $response['proxyurl'] = $rs->campos["proxy"];
                switch ($rs->campos["modomul"]) {
                        case 1:  $response['mcastmode'] = "half-duplex"; break;
                        case 2:  $response['mcastmode'] = "full-duplex"; break;
                        default: $response['mcastmode'] = $rs->campos["modomul"];
                }
                $response['mcastip'] = $rs->campos["ipmul"];
                $response['mcastport'] = $rs->campos["pormul"];
                $response['mcastspeed'] = $rs->campos["velmul"];
                $response['p2pmode'] = $rs->campos["modp2p"];
                $response['p2ptime'] = $rs->campos["timep2p"];
                $response['picture'] = $rs->campos["urlfoto"];
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);


/**
 * @brief    List all clients defined in a lab
 * @note     Route: /ous/id1/labs/id2/clients, Method: GET
 * @param    id1     OU id.
 * @param    id2     lab id.
 * @return   JSON data with lab id. and array of lab parameters
 */
$app->get('/ous/:ouid/labs/:labid/clients(/)', 'validateApiKey',
    function($ouid, $labid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $labid = htmlspecialchars($labid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, ordenadores.*, aulas.idaula AS labid
  FROM ordenadores
 RIGHT JOIN aulas USING(idaula)
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid'
   AND aulas.idaula='$labid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and lab exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["labid"])) {
                $response = Array();
                while (!$rs->EOF) {
                        if (!is_null($rs->campos["idordenador"])) {
                                $tmp = Array();
                                $tmp['id'] = $rs->campos["idordenador"];
                                $tmp['name'] = $rs->campos["nombreordenador"];
                                $tmp['ip'] = $rs->campos["ip"];
                                $tmp['mac'] = $rs->campos["mac"];
                                $tmp['ou']['id'] = $ouid;
                                $tmp['lab']['id'] = $labid;
                                array_push($response, $tmp);
                        }
                        $rs->Siguiente();
                }
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    Get client data
 * @note     Route: /ous/id1/labs/id2clients/id3, Method: GET
 * @param    id1     OU id.
 * @param    id2     lab id.
 * @param    id3     client id.
 * @return   JSON string with hardware parameters
 */
$app->get('/ous/:ouid/labs/:labid/clients/:clntid(/)', 'validateApiKey',
    function($ouid, $labid, $clntid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $labid = htmlspecialchars($labid);
        $clntid = htmlspecialchars($clntid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, ordenadores.*
  FROM ordenadores
  JOIN aulas USING(idaula)
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND idcentro='$ouid'
   AND idaula='$labid'
   AND idordenador='$clntid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin, lab exists and client exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idaula"]) and checkParameter($rs->campos["idordenador"])) {
                // Read data.
                $response['id'] = $rs->campos["idordenador"];
                $response['name'] = $rs->campos["nombreordenador"];
                $response['serialno'] = $rs->campos["numserie"];
                $response['netiface'] = $rs->campos["netiface"];
                $response['netdriver'] = $rs->campos["netdriver"];
                $response['mac'] = $rs->campos["mac"];
                $response['ip'] = $rs->campos["ip"];
                $response['netmask'] = $rs->campos["mascara"];
                $response['routerip'] = $rs->campos["router"];
                $response['repo']['id'] = $rs->campos["idrepositorio"];
                //$response['hardprofile']['id'] = $rs->campos["idperfilhard"];
                //$response['menu']['id'] = $rs->campos["idmenu"];
                $response['validation'] = $rs->campos["validacion"]==0 ? false: true;
                $response['boottype'] = $rs->campos["arranque"];
                $response['picture'] = $rs->campos["fotoord"];
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    Get client's harware configuration data
 * @note     Route: /ous/id1/labs/id2clients/id3/hardware, Method: GET
 * @param    id1     OU id.
 * @param    id2     lab id.
 * @param    id3     client id.
 * @return   JSON string with cleint parameters
 */
$app->get('/ous/:ouid/labs/:labid/clients/:clntid/hardware(/)', 'validateApiKey',
    function($ouid, $labid, $clntid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $labid = htmlspecialchars($labid);
        $clntid = htmlspecialchars($clntid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, ordenadores.idordenador, ordenadores.nombreordenador,
       tipohardwares.nemonico, hardwares.descripcion
  FROM ordenadores
  JOIN aulas USING(idaula)
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
  LEFT JOIN perfileshard_hardwares USING(idperfilhard)
  LEFT JOIN hardwares ON perfileshard_hardwares.idhardware=hardwares.idhardware
  LEFT JOIN tipohardwares ON tipohardwares.idtipohardware=hardwares.idtipohardware
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid'
   AND aulas.idaula='$labid'
   AND ordenadores.idordenador='$clntid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and client exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idordenador"])) {
                // Read data.
                $response['id'] = $rs->campos["idordenador"];
                $response['name'] = $rs->campos["nombreordenador"];
                $response['hardware'] = Array();
                while (!$rs->EOF) {
                        if (!is_null($rs->campos["nemonico"])) {
                                $tmp = Array();
                                $tmp['type'] = $rs->campos["nemonico"];
                                $tmp['description'] = $rs->campos["descripcion"];
                                array_push($response['hardware'], $tmp);
                        }
                        $rs->Siguiente();
                }
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    Get client's disk configuration data
 * @note     Route: /ous/id1/labs/id2clients/id3/diskcfg, Method: GET
 * @param    id1     OU id.
 * @param    id2     lab id.
 * @param    id3     client id.
 * @return   JSON string with disk parameters
 */
$app->get('/ous/:ouid/labs/:labid/clients/:clntid/diskcfg(/)', 'validateApiKey',
    function($ouid, $labid, $clntid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $labid = htmlspecialchars($labid);
        $clntid = htmlspecialchars($clntid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, ordenadores.idordenador AS clientid,
       ordenadores.nombreordenador, ordenadores_particiones.*, tipospar.tipopar,
       sistemasficheros.nemonico, nombresos.nombreso, imagenes.nombreca,
       (imagenes.revision - ordenadores_particiones.revision) AS difimagen
  FROM ordenadores_particiones
 RIGHT JOIN ordenadores USING(idordenador)
  JOIN aulas USING(idaula)
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
  LEFT JOIN tipospar USING(codpar)
  LEFT JOIN sistemasficheros USING(idsistemafichero)
  LEFT JOIN nombresos USING(idnombreso)
  LEFT JOIN imagenes USING(idimagen)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid'
   AND aulas.idaula='$labid'
   AND ordenadores.idordenador='$clntid'
 ORDER BY numdisk ASC, numpar ASC;
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and client exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["clientid"])) {
                // Read data.
                $response['id'] = $rs->campos["clientid"];
                $response['name'] = $rs->campos["nombreordenador"];
                $response['diskcfg'] = Array();
                while (!$rs->EOF) {
                        if ($rs->campos["numdisk"] == 0) {
                                $rs->Siguiente();
                                continue;
                        }
                        $tmp = Array();
                        if ($rs->campos["numpar"] == 0) {
                                // Disk data.
                                $tmp['disk'] = $rs->campos["numdisk"];
                                switch ($rs->campos["codpar"]) {
                                        case 1:  $tmp['parttable'] = "MSDOS"; break;
                                        case 2:  $tmp['parttable'] = "GPT"; break;
                                        case 3:  $tmp['parttable'] = "LVM"; break;
                                        case 4:  $tmp['parttable'] = "ZPOOL"; break;
                                        default: $tmp['parttable'] = $rs->campos["codpar"];
                                }
                                $tmp['size'] = $rs->campos["tamano"];
                        } else {
                                // Partition data.
                                $tmp['partition'] = $rs->campos["numpar"];
                                $tmp['parttype'] = $rs->campos["tipopar"];
                                $tmp['filesystem'] = $rs->campos["nemonico"];
                                $tmp['size'] = $rs->campos["tamano"];
                                $tmp['usage'] = $rs->campos["uso"];
                                if ($rs->campos["nombreso"] != null) {
                                        $tmp['os'] = $rs->campos["nombreso"];
                                        if ($rs->campos["idimagen"] > 0) {
                                                // Restored image data.
                                                $tmp['image']['id'] = $rs->campos["idimagen"];
                                                $tmp['image']['deploydate'] = $rs->campos["fechadespliegue"];
                                                // Check if image is updated.
                                                $tmp['image']['updated'] = ($rs->campos["difimagen"]>0 ? "false" : "true");
                                        }
                                }
                                //$tmp['cachedata'] = $rs->campos["cache"];
                        }
                        array_push($response['diskcfg'], $tmp);
                        $rs->Siguiente();
                }
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    Get client's execution status
 * @note     Route: /ous/id1/labs/id2clients/id3/status, Method: GET
 * @param    id1     OU id.
 * @param    id2     lab id.
 * @param    id3     client id.
 * @return   JSON string with client status
 */
$app->get('/ous/:ouid/labs/:labid/clients//status(/)', 'validateApiKey', 'getStatus');
$app->get('/ous/:ouid/labs/:labid/clients/:clntid/status(/)', 'validateApiKey', 'getStatus');
function getStatus($ouid, $labid, $clntid=0) {
        global $userid;
        global $cmd;
        global $LONCABECERA;
        global $LONHEXPRM;
        $app = \Slim\Slim::getInstance();
        $clientid = $clientip = "";
        $urls = Array();
        // Status mapping.
        $status = Array('OFF'=>"off",
                        'INI'=>"initializing",
                        'OPG'=>"ogclient",
                        'BSY'=>"busy",
                        'LNX'=>"linux",
                        'OSX'=>"macos",
                        'WIN'=>"windows",
                        'UNK'=>"unknown");
        // Parameters.
        $ouid = htmlspecialchars($ouid);
        $labid = htmlspecialchars($labid);
        $single = is_numeric(explode("/", $app->request->getResourceUri())[6]);

        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, entornos.ipserveradm, entornos.portserveradm,
       aulas.idaula, ordenadores.idordenador, ordenadores.ip
  FROM entornos, ordenadores
  JOIN aulas USING(idaula)
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid'
   AND aulas.idaula='$labid'
EOD;
        // Request for a single client.
        if ($single) {
                $clntid = htmlspecialchars($clntid);
                $cmd->texto .= <<<EOD
   AND ordenadores.idordenador='$clntid';
EOD;
        } else {
                $response = Array();
        }
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and asset exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and (($single and checkParameter($rs->campos["idordenador"])) or (! $single and checkParameter($rs->campos["idaula"])))) {
                // First, try to connect to ogAdmCleint service.
                $serverip = $rs->campos["ipserveradm"];
                $serverport = $rs->campos["portserveradm"];
                while (!$rs->EOF) {
                        $id[$rs->campos["ip"]] = $rs->campos["idordenador"];
                        $stat[$rs->campos["ip"]] = $status['OFF'];
                        $rs->Siguiente();
                }
                // Connect to reset client's status.
                $clientid = implode(",", $id);
                $clientip = implode(";", array_keys($id));
                $reqframe = "nfn=Sondeo\r".
                            "ido=$clientid\r".
                            "iph=$clientip\r";
                $result = sendCommand($serverip, $serverport, $reqframe, $values);
                // Connect to fetch client's status.
                // Asuming client is off by default.
                $values["tso"]="OFF";
                // Iterate to check client's status.
                // Exit if status!=OFF or end iterations (status=OFF).
                $maxIter = 30;
                for ($i=1; $i<$maxIter and preg_match('/OFF/', $values["tso"]); $i++) {
                        // Connect to check status.
                        $reqframe = "nfn=respuestaSondeo\r".
                                    "ido=$clientid\r".
                                    "iph=$clientip\r";
                        $result = sendCommand($serverip, $serverport, $reqframe, $values);
                        // Wait until next checking (0.1 ms).
                        usleep(100000);
                }
                // Parse status response.
                if ($result) {
                        // Check status type.
                        if (checkParameter($values["tso"])) {
                                foreach (explode(";", $values["tso"]) as $data) {
                                        if (!empty($data)) {
                                                list($clip, $clst) = explode("/", $data);
                                                if ($clst != "OFF") {
                                                        // Update current status.
                                                        $stat[$clip] = $status[$clst];
                                                }
                                        }
                                }
                        }
                        // Prepare request to new OGAgent for OSes.
                        foreach ($stat as $ip => $st) {
                                if ($st == "off") {
                                        $urls[$ip] = "https://$ip:8000/opengnsys/status";
                                }
                        }
                        // Send request to OGAgents.
                        if (isset($urls)) {
                                $result = multiRequest($urls);
                        }
                        // Parse responses.
                        reset($urls);
                        foreach ($result as $res) {
                                if (!empty($res['data'])) {
                                        // Get status and session data.
                                        $ip = key($urls);
                                        $data = json_decode($res['data']);
                                        if (@isset($status[$data->status])) {
                                                $stat[$ip] = $status[$data->status];
                                                $logged[$ip] = $data->loggedin;
                                        } else {
                                                $stat[$ip] = $status['UNK'];
                                        }
                                }
                                unset($urls[$ip]);
                        }
                        // Compose JSON response.
                        if ($single) {
                                // Single response.
                                $response['id'] = reset($id);
                                $response['ip'] = key($id);
                                $response['status'] = $stat[$ip];
                                empty($logged[$ip]) || $response['loggedin'] = $logged[$ip];
                        } else {
                                // Multiple responses.
                                foreach ($stat as $ip => $st) {
                                        $tmp = Array();
                                        $tmp['id'] = $id[$ip];
                                        $tmp['ip'] = $ip;
                                        $tmp['status'] = $stat[$ip];
                                        empty($logged[$ip]) || $tmp['loggedin'] = $logged[$ip];
                                        array_push($response, $tmp);
                                }
                        }
                        jsonResponse(200, $response);
                } else {
                        // Access error.
                        $response['message'] = "Cannot access to OpenGnsys server";
                        jsonResponse(500, $response);
                }
        }
        $rs->Cerrar(); 
}


/**
 * @brief    List all image repositories defined in an OU
 * @note     Route: /ous/id/repos, Method: GET
 * @param    id      OU id.
 * @return   JSON array of all UO's repo data 
 */
$app->get('/ous/:ouid/repos(/)', 'validateApiKey',
    function($ouid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, adm.idcentro AS ouid, repositorios.*
  FROM repositorios
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["ouid"])) {
                $response = Array();
                while (!$rs->EOF) {
                        if (! is_null($rs->campos["idcentro"])) {
                                $tmp = Array();
                                $tmp['id'] = $rs->campos["idrepositorio"];
                                $tmp['name'] = $rs->campos["nombrerepositorio"];
                                $tmp['ou']['id'] = $ouid;
                                array_push($response, $tmp);
                        }
                        $rs->Siguiente();
                }
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    Get image repository data
 * @note     Route: /ous/id1/repos/id2, Method: GET
 * @param    id1     OU id.
 * @param    id2     repo id.
 * @return   JSON string with repo parameters
 */
$app->get('/ous/:ouid/repos/:repoid(/)', 'validateApiKey',
    function($ouid, $repoid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $repoid = htmlspecialchars($repoid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, repositorios.*
  FROM repositorios
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid'
   AND idrepositorio='$repoid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and repo exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idrepositorio"])) {
                // Read data.
                $response['id'] = $rs->campos["idrepositorio"];
                $response['name'] = $rs->campos["nombrerepositorio"];
                $response['description'] = $rs->campos["comentarios"];
                $response['ip'] = $rs->campos["ip"];
                //$response['port'] = $rs->campos["puertorepo"];
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

/**
 * @brief    List all images defined in an OU
 * @note     Route: /ous/id/images, Method: GET
 * @param    id      OU id.
 * @return   JSON array of all UO's image data 
 */
$app->get('/ous/:ouid/images(/)', 'validateApiKey',
    function($ouid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, adm.idcentro AS ouid, imagenes.*
  FROM imagenes
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["ouid"])) {
                $response = Array();
                while (!$rs->EOF) {
                        if (! is_null($rs->campos["idcentro"])) {
                                $tmp = Array();
                                $tmp['id'] = $rs->campos["idimagen"];
                                $tmp['name'] = $rs->campos["nombreca"];
                                $tmp['inremotepc'] = $rs->campos["inremotepc"]==0 ? false: true;
                                $tmp['ou']['id'] = $ouid;
                                array_push($response, $tmp);
                        }
                        $rs->Siguiente();
                }
                jsonResponse(200, $response);
        }
    }
);

/**
 * @brief    Get image data
 * @note     Route: /ous/id1/images/id2, Method: GET
 * @param    id1     OU id.
 * @param    id2     image id.
 * @return   JSON string with image parameters
 */
$app->get('/ous/:ouid/images/:imgid(/)', 'validateApiKey',
    function($ouid, $imgid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $imgid = htmlspecialchars($imgid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, imagenes.*
  FROM imagenes
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
 WHERE adm.idadministradorcentro = '$userid'
   AND adm.idcentro='$ouid'
   AND idimagen='$imgid';
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and repo exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idimagen"])) {
                // Read data.
                $response['id'] = $rs->campos["idimagen"];
                $response['name'] = $rs->campos["nombreca"];
                $response['description'] = $rs->campos["descripcion"];
                $response['comments'] = $rs->campos["comentarios"];
                $response['inremotepc'] = $rs->campos["inremotepc"]==0 ? false: true;
                $response['repo']['id'] = $rs->campos["idrepositorio"];
                switch ($rs->campos["tipo"]) {
                        // Image type.
                        case 1:  $response['type'] = "monolithic"; break;
                        case 2:  $response['type'] = "base"; break;
                        case 3:  $response['type'] = "incremental";
                                 $response['baseimg'] = $rs->campos["imagenid"];
                                 $response['path'] = $rs->campos["ruta"];
                                 break;
                        default: $response['type'] = $rs->campos["tipo"];
                }
                if ($rs->campos["idordenador"] != 0) {
                        // Source client data.
                        $response['client']['id'] = $rs->campos["idordenador"];
                        $response['client']['disk'] = $rs->campos["numdisk"];
                        $response['client']['partition'] = $rs->campos["numpar"];
                        $response['creationdate'] = $rs->campos["fechacreacion"];
                        $response['release'] = $rs->campos["revision"];
                }
                jsonResponse(200, $response);
        }
        $rs->Cerrar(); 
    }
);

// Lista de softeare instalado en una imagen.
$app->get('/ous/:ouid/images/:imgid/software(/)', 'validateApiKey',
    function($ouid, $imgid) {
        global $userid;
        global $cmd;

        $ouid = htmlspecialchars($ouid);
        $imgid = htmlspecialchars($imgid);
        // Database query.
        $cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, imagenes.idimagen, imagenes.nombreca,
       nombresos.nombreso, softwares.descripcion
  FROM imagenes
 RIGHT JOIN administradores_centros AS adm USING(idcentro)
  LEFT JOIN perfilessoft USING(idperfilsoft)
  LEFT JOIN nombresos USING(idnombreso)
  LEFT JOIN perfilessoft_softwares USING(idperfilsoft)
  LEFT JOIN softwares USING(idsoftware)
 WHERE adm.idadministradorcentro = '$userid'
   AND imagenes.idimagen='$imgid'
 ORDER BY softwares.descripcion ASC;
EOD;
        $rs=new Recordset;
        $rs->Comando=&$cmd;
        if (!$rs->Abrir()) return(false);       // Error oppening recordset.
        $rs->Primero();
        // Check if user is an UO admin and repo exists.
        if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idimagen"])) {
                $response['id'] = $rs->campos["idimagen"];
                $response['name'] = $rs->campos["nombreca"];
                if (is_null($rs->campos["nombreso"])) {
                        // Null object.
                        $response['software'] = Array();
                        jsonResponse(200, $response, JSON_FORCE_OBJECT);
                } else {
                        // Read data.
                        $response['software']['os'] = $rs->campos["nombreso"];
                        //$response['software']['type'] = ...;  // OS type
                        $response['software']['applications'] = Array();
                        while (!$rs->EOF) {
                                // Ignoring empty fields.
                                if (!is_null($rs->campos["descripcion"])) {
                                        array_push($response['software']['application'], $rs->campos["descripcion"]);
                                }
                                $rs->Siguiente();
                        }
                        jsonResponse(200, $response);
                }
        }
        $rs->Cerrar(); 
    }
);

?>