#######################
LoginAPI (api/login)
#######################
GET -> Authentication method 
    Out:
        200 -> AUTH_RESULT = "OK" : Authentication sucessful
        401 -> AUTH_RESULT = "AUTHENTICATION_FAILURE" : Wrong login/password
        403 -> AUTH_RESULT = "NOT_ALLOWED" : User is not allowed for this application
        201 -> AUTH_RESULT = "ALREADY_LOGGED" : A user is already logged on this session

DELETE -> Logout current user
    Out:
        200 -> AUTH_RESULT = "OK" : Logout sucessful


#######################
UserInfoAPI (api/userInfo)
#######################
GET -> Get the current logged user, return None if no one is connected
    Out:
        200 -> USER = <USER_OBJECT>|null : Dictionary containing user infos or null


########################
Redirect to cas auth (/login)
########################
Redirect to cas auth


########################
UserAPI (api/user)
########################
POST -> Create a user if it not already exists
    In:
        CASid = Login of the user caught from the CAS authentication
        role = Role of the user (can be concatenated with -) 1=secrétaire, 2=resp_formation, 3=tuteur_univ, 4=étudiant
    Out:
        200 -> UID = <USER_ID> : The user already exists with the id USER_ID
        201 -> UID = <USER_ID> : The user has been successfully created with the id USER_ID
        400 -> ERROR = "One or more parameters are missing" : Bad request

PUT -> Modify an existing user
    In: (Suffix = /byuid/<USER_ID>)
        CASid = Login of the user caught from the CAS authentication
        role = Role of the user (can be concatenated with -) 1=secrétaire, 2=resp_formation, 3=tuteur_univ, 4=étudiant
        phone = Phone number of the user (00.00.00.00.00)
        email = Email of the user
    Out:
        200 -> UID = <USER_ID> : The user has been modified sucessfully with the id USER_ID
        400 -> ERROR = "One or more parameters are missing !" : Bad request
        405 -> ERROR = "This user doesn't exists !" : Bad USER_ID provided

GET -> Getting specified user infos
    In: (Suffixes = /byuid/<USER_ID> | /bylogin/<USER_LOGIN> | /byemail/<USER_EMAIL>)
    Out:
        200 -> USER = <USER_OBJECT>|null : Dictionary containing user infos or null