Authentication class

[LabiciIvan]

Description:

Create an Authentication::class which will have next capabilities:

• register user;
• log in user;
• log out user;
• check if user is logged in;
• check if user exists;

Class Methods:

register():

• it register a new user into the database;
• expects an array of data with which will be necessary to insert into users table;

userExists():

• it checks if a user record exists into the database;
• expectes a user email as argument;
• additional if user exists will store the user ID and will be available in getUserID() method;

getUserID():

• returns the user ID which was previously stored by the userExists() method;

isLoggedIn():

• checks if the user is logged in the database;
• it expects an user id as parameter;
• checks records from login table where the user_id column belongs to the id passed as parameter and deleted column is marked as 'N' - (NOT DELETED);

login():

• logs the user in to the application;
• login works by inserting a record into the login table;
• it will insert the following column in the login table: token, expire_at and user_id.
• expects parameter an user ID;
• the expire_at TIMESTAMP is calculated from the current time and additional one more day is added.

logout():

• logs the user out of the database;
• a user is logged out by marking the deleted column to 'Y' (YES);
• it expects an userID as parameter;

[LabiciIvan]

Will need an additional method getLastID() which will return the last inserted ID.

This last inserted ID will be stored by the register() method if registration succeeds into a private int variable called $lastID.