mooc.js

var client_id = "50c4648f34bb075578c383ec62d6908fa49b6986d992c34a2a029be777e0337e";
var client_secret = "d15d4d4ba2b80a91aaff7a5c94d30fe65c87b058991a327a5de4dfe71f7c5576";
var mooc_status = 0;
var mooc_token;

function mooc_login(username,password,callback) {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4) {
            var response = this.responseText;
            mooc_status = this.status == 200 && response != "ERROR" ? 1 : 2;
            if (mooc_status == 1) {
                mooc_token = response;
                sessionStorage.setItem("mooc_token",mooc_token);
            }
            callback();
        }
    }
    xhttp.open("POST","https://ahslaaks.users.cs.helsinki.fi/mooc/login.php",true);
    xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    xhttp.send("username="+encodeURIComponent(username)+"&"+
               "password="+encodeURIComponent(password));
}

function mooc_logout(callback) {
    mooc_status = 0;
    mooc_token = "";
    sessionStorage.clear();
    callback();
}

function mooc_query(query,callback) {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            callback(JSON.parse(this.responseText));
        }
    }
    xhttp.open("GET",query,true);
    xhttp.setRequestHeader("Authorization","Bearer "+mooc_token);
    xhttp.send();
}

function quizzes_status(callback) {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            callback(this.responseText.split(" "));
        }
    }
    xhttp.open("GET","https://ahslaaks.users.cs.helsinki.fi/mooc/sql_status.php?token="+mooc_token,true);
    xhttp.send();
}

function quizzes_send(task,sql,result,callback) {
    result = result ? 1 : 0;
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            callback();
        }
    }
    xhttp.open("POST","https://ahslaaks.users.cs.helsinki.fi/mooc/sql_send.php",true);
    xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    xhttp.send("token="+mooc_token+"&"+
               "task="+task+"&"+
               "result="+result+"&"+
               "data="+encodeURIComponent(sql));
}

function quizzes_answer(task,callback) {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            callback(this.responseText);
        }
    }
    xhttp.open("GET","https://ahslaaks.users.cs.helsinki.fi/mooc/sql_answer.php?token="+mooc_token+"&task="+task,true);
    xhttp.send();
}

function quizzes_model(task,callback) {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            callback(this.responseText);
        }
    }
    xhttp.open("GET","https://ahslaaks.users.cs.helsinki.fi/mooc/sql_model.php?token="+mooc_token+"&task="+task,true);
    xhttp.send();
}

if (sessionStorage.getItem("mooc_token")) {
    mooc_status = 1;
    mooc_token = sessionStorage.getItem("mooc_token");
}