PHP Rest API Framework SLIM to Create REST API – Android Coding by DMTechnolab

 

<?php

 

//including the required files

require_once ‘../include/DbOperation.php’;

require ‘.././libs/Slim/Slim.php’;

 

SlimSlim::registerAutoloader();

 

$app = new SlimSlim();

 

/* *

* URL: http://localhost/StudentApp/v1/createstudent

* Parameters: name, username, password

* Method: POST

* */

$app->post(‘/createstudent’, function () use ($app) {

    verifyRequiredParams(array(‘name’, ‘username’, ‘password’));

    $response = array();

    $name = $app->request->post(‘name’);

    $username = $app->request->post(‘username’);

    $password = $app->request->post(‘password’);

    $db = new DbOperation();

    $res = $db->createStudent($name, $username, $password);

    if ($res == 0) {

        $response[“error”] = false;

        $response[“message”] = “You are successfully registered”;

        echoResponse(201, $response);

    } else if ($res == 1) {

        $response[“error”] = true;

        $response[“message”] = “Oops! An error occurred while registereing”;

        echoResponse(200, $response);

    } else if ($res == 2) {

        $response[“error”] = true;

        $response[“message”] = “Sorry, this student  already existed”;

        echoResponse(200, $response);

    }

});

 

/* *

* URL: http://localhost/StudentApp/v1/studentlogin

* Parameters: username, password

* Method: POST

* */

$app->post(‘/studentlogin’, function () use ($app) {

    verifyRequiredParams(array(‘username’, ‘password’));

    $username = $app->request->post(‘username’);

    $password = $app->request->post(‘password’);

    $db = new DbOperation();

    $response = array();

    if ($db->studentLogin($username, $password)) {

        $student = $db->getStudent($username);

        $response[‘error’] = false;

        $response[‘id’] = $student[‘id’];

        $response[‘name’] = $student[‘name’];

        $response[‘username’] = $student[‘username’];

        $response[‘apikey’] = $student[‘api_key’];

    } else {

        $response[‘error’] = true;

        $response[‘message’] = “Invalid username or password”;

    }

    echoResponse(200, $response);

});

 

/* *

* URL: http://localhost/StudentApp/v1/createfaculty

* Parameters: name, username, password, subject

* Method: POST

* */

$app->post(‘/createfaculty’, function () use ($app) {

    verifyRequiredParams(array(‘name’, ‘username’, ‘password’, ‘subject’));

    $name = $app->request->post(‘name’);

    $username = $app->request->post(‘username’);

    $password = $app->request->post(‘password’);

    $subject = $app->request->post(‘subject’);

 

    $db = new DbOperation();

    $response = array();

 

    $res = $db->createFaculty($name, $username, $password, $subject);

    if ($res == 0) {

        $response[“error”] = false;

        $response[“message”] = “You are successfully registered”;

        echoResponse(201, $response);

    } else if ($res == 1) {

        $response[“error”] = true;

        $response[“message”] = “Oops! An error occurred while registereing”;

        echoResponse(200, $response);

    } else if ($res == 2) {

        $response[“error”] = true;

        $response[“message”] = “Sorry, this faculty already existed”;

        echoResponse(200, $response);

    }

});

 

 

/* *

* URL: http://localhost/StudentApp/v1/facultylogin

* Parameters: username, password

* Method: POST

* */

 

$app->post(‘/facultylogin’, function() use ($app){

    verifyRequiredParams(array(‘username’,‘password’));

    $username = $app->request->post(‘username’);

    $password = $app->request->post(‘password’);

 

    $db = new DbOperation();

 

    $response = array();

 

    if($db->facultyLogin($username,$password)){

        $faculty = $db->getFaculty($username);

        $response[‘error’] = false;

        $response[‘id’] = $faculty[‘id’];

        $response[‘name’] = $faculty[‘name’];

        $response[‘username’] = $faculty[‘username’];

        $response[‘subject’] = $faculty[‘subject’];

        $response[‘apikey’] = $faculty[‘api_key’];

    }else{

        $response[‘error’] = true;

        $response[‘message’] = “Invalid username or password”;

    }

 

    echoResponse(200,$response);

});

 

 

/* *

* URL: http://localhost/StudentApp/v1/createassignment

* Parameters: name, details, facultyid, studentid

* Method: POST

* */

$app->post(‘/createassignment’,function() use ($app){

    verifyRequiredParams(array(‘name’,‘details’,‘facultyid’,‘studentid’));

 

    $name = $app->request->post(‘name’);

    $details = $app->request->post(‘details’);

    $facultyid = $app->request->post(‘facultyid’);

    $studentid = $app->request->post(‘studentid’);

 

    $db = new DbOperation();

 

    $response = array();

 

    if($db->createAssignment($name,$details,$facultyid,$studentid)){

        $response[‘error’] = false;

        $response[‘message’] = “Assignment created successfully”;

    }else{

        $response[‘error’] = true;

        $response[‘message’] = “Could not create assignment”;

    }

 

    echoResponse(200,$response);

 

});

 

/* *

* URL: http://localhost/StudentApp/v1/assignments/<student_id>

* Parameters: none

* Authorization: Put API Key in Request Header

* Method: GET

* */

$app->get(‘/assignments/:id’, ‘authenticateStudent’, function($student_id) use ($app){

    $db = new DbOperation();

    $result = $db->getAssignments($student_id);

    $response = array();

    $response[‘error’] = false;

    $response[‘assignments’] = array();

    while($row = $result->fetch_assoc()){

        $temp = array();

        $temp[‘id’]=$row[‘id’];

        $temp[‘name’] = $row[‘name’];

        $temp[‘details’] = $row[‘details’];

        $temp[‘completed’] = $row[‘completed’];

        $temp[‘faculty’]= $db->getFacultyName($row[‘faculties_id’]);

        array_push($response[‘assignments’],$temp);

    }

    echoResponse(200,$response);

});

 

 

/* *

* URL: http://localhost/StudentApp/v1/submitassignment/<assignment_id>

* Parameters: none

* Authorization: Put API Key in Request Header

* Method: PUT

* */

 

$app->put(‘/submitassignment/:id’, ‘authenticateFaculty’, function($assignment_id) use ($app){

    $db = new DbOperation();

    $result = $db->updateAssignment($assignment_id);

    $response = array();

    if($result){

        $response[‘error’] = false;

        $response[‘message’] = “Assignment submitted successfully”;

    }else{

        $response[‘error’] = true;

        $response[‘message’] = “Could not submit assignment”;

    }

    echoResponse(200,$response);

});

 

 

/* *

* URL: http://localhost/StudentApp/v1/students

* Parameters: none

* Authorization: Put API Key in Request Header

* Method: GET

* */

$app->get(‘/students’, ‘authenticateFaculty’, function() use ($app){

    $db = new DbOperation();

    $result = $db->getAllStudents();

    $response = array();

    $response[‘error’] = false;

    $response[‘students’] = array();

 

    while($row = $result->fetch_assoc()){

        $temp = array();

        $temp[‘id’] = $row[‘id’];

        $temp[‘name’] = $row[‘name’];

        $temp[‘username’] = $row[‘username’];

        array_push($response[‘students’],$temp);

    }

 

    echoResponse(200,$response);

});

 

function echoResponse($status_code, $response)

{

    $app = SlimSlim::getInstance();

    $app->status($status_code);

    $app->contentType(‘application/json’);

    echo json_encode($response);

}

 

 

function verifyRequiredParams($required_fields)

{

    $error = false;

    $error_fields = “”;

    $request_params = $_REQUEST;

 

    if ($_SERVER[‘REQUEST_METHOD’] == ‘PUT’) {

        $app = SlimSlim::getInstance();

        parse_str($app->request()->getBody(), $request_params);

    }

 

    foreach ($required_fields as $field) {

        if (!isset($request_params[$field]) || strlen(trim($request_params[$field])) <= 0) {

            $error = true;

            $error_fields .= $field . ‘, ‘;

        }

    }

 

    if ($error) {

        $response = array();

        $app = SlimSlim::getInstance();

        $response[“error”] = true;

        $response[“message”] = ‘Required field(s) ‘ . substr($error_fields, 0, –2) . ‘ is missing or empty’;

        echoResponse(400, $response);

        $app->stop();

    }

}

 

function authenticateStudent(SlimRoute $route)

{

    $headers = apache_request_headers();

    $response = array();

    $app = SlimSlim::getInstance();

 

    if (isset($headers[‘Authorization’])) {

        $db = new DbOperation();

        $api_key = $headers[‘Authorization’];

        if (!$db->isValidStudent($api_key)) {

            $response[“error”] = true;

            $response[“message”] = “Access Denied. Invalid Api key”;

            echoResponse(401, $response);

            $app->stop();

        }

    } else {

        $response[“error”] = true;

        $response[“message”] = “Api key is misssing”;

        echoResponse(400, $response);

        $app->stop();

    }

}

 

 

function authenticateFaculty(SlimRoute $route)

{

    $headers = apache_request_headers();

    $response = array();

    $app = SlimSlim::getInstance();

    if (isset($headers[‘Authorization’])) {

        $db = new DbOperation();

        $api_key = $headers[‘Authorization’];

        if (!$db->isValidFaculty($api_key)) {

            $response[“error”] = true;

            $response[“message”] = “Access Denied. Invalid Api key”;

            echoResponse(401, $response);

            $app->stop();

        }

    } else {

        $response[“error”] = true;

        $response[“message”] = “Api key is misssing”;

        echoResponse(400, $response);

        $app->stop();

    }

}

 

$app->run();