On Mobile App Authentication database method

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4D v19.8


$1 -> On Mobile App Authentication database method -> $0

Parameter	Type	Description
$1	Object	Information passed by the mobile application
$0	Object	Authentication status

Description

The On Mobile App Authentication database method is in charge of managing mobile app authentication to 4D Server or 4D Developer. It is automatically called by 4D when a user agent sends a login request to 4D Server or 4D Developer for the first time.

Note: A user agent is defined by an application ID, a device ID, and a team ID. These ids are passed to the On Mobile App Authentication database method (see below).

The On Mobile App Authentication database method is always called for a first connection, even if the mobile application was built in Guest mode.

The method receives all necessary information from the mobile application in the $1 parameter (object), and must return an authentication status in the $0 parameter (object). You must declare and initialize these parameters as follows:

  //On Mobile App Authentication database method

 C_OBJECT($0;$1)

  // ...Code for the method

 $0:=New object //do not forget to create the object to return

The following properties are received in the $1 object parameter:

Property name		Type	Description
email		Text	User email. Not mandatory, can be empty for guest access
application		Object	Information about the mobile application
	id	Text	Mobile application id
	name	Text	Mobile application name
	version	Text	Mobile application version
device		Object	Information about the mobile device (usually, a mobile phone)
	id	Text	Generated unique device id
	version	Text	System version of the device
	description	Text	Description of the device
	simulator	Boolean	True if the device is a simulator
team		Object	Apple Developer Team information
	id	Text	Team id (allows developers to use the Xcode project Build and Run functionality)
language		Object	Language settings of the user device
	id	Text	User device current language id, ex: en_US
	region	Text	User device current region, ex: US
	code	Text	User device current language, ex: en
parameters		Object	Any additional information that could be added by the mobile app for custom use
session		Object	Session information
	id	Text	Session UUID created for this authentication. Could be stored for future use
	ip	Text	Client IP address

After processing information, the database method should return an object with the following properties in $0:

Property name	Type	Description
userInfo	Object	User values to filter queries.
success	Boolean	True if authentication is successful, False otherwise. If success=False, the connection is denied.
statusText	Text	(Optional) Message to display on the mobile application. If success=true, welcome message; if success=false, can be used to provide user with an explanation

The connection is automatically rejected if:

no value is set to $0 or $0 is not defined,
an invalid value is set to $0,
the On Mobile App Authentication database method is not defined in the application.

The connection is automatically accepted if it comes from "localhost" since it is considered a developer testing connection.

Authenticating a mobile request

Basically, authenticating a mobile application connection request is based upon the provided email. For example, if you want to grant access only to connections from emails at 4d.com domain, you can write in the On Mobile App Authentication database method:

 If($1.email="@"+Char(At sign)+"4d.com")

    $0.success:=True

 End if

You can also identify the user agent using the application.id, device.id, and team.id from the $1 object, and decide to allow or deny access.

Guest access

If the mobile application has been built with the "Requires an email to connect" option unchecked, it is a "guest mode" application. Then, the $1.email string will be provided empty. In this case, you can:

allow access to guests by returning True in $0.success,
identify and evaluate guest access using the user agent information, the decide to allow or deny access.
deny access to guests by returning False in $0.success. This can be done for example if the server is in maintenance mode. In this case, an error will be displayed on the mobile app if the user clicks on the Reload button.

Example

Here is a template example for a On Mobile App Authentication database method:

  //On Mobile App Authentication database method

 C_OBJECT($0)

 C_OBJECT($1)

 

 C_BOOLEAN($Boo_simulator)

 C_TEXT($Txt_appID;$Txt_appName;$Txt_appVersion;$Txt_device;$Txt_deviceID;$Txt_email)

 C_TEXT($Txt_IP;$Txt_languageCode;$Txt_languageId;$Txt_languageRegion;$Txt_osVersion;$Txt_sessionId)

 C_TEXT($Txt_teamID)

 C_OBJECT($Obj_request;$Obj_response)

 

 $Obj_request:=$1 //Information provided by mobile application

 $Obj_response:=New object //To return in $0 after processing

 

  //Get user email

 $Txt_email:=String($Obj_request.email)

 

 If(Length($Txt_email)=0) //no email was provided

  // Guest mode - allow or deny connection

    $Obj_response.success:=True

  // $Obj_response.success:=False if you want to deny guest access

 

  // Optional welcome message to display on mobile App.

    $Obj_response.statusText:="Welcome to my application"

 

 Else

  // Authenticated mode -  Allow or not the connection

    If(Is compiled mode) // Deployment version

 

  //Allow, for example, emails from the 4D.com domain

       $Obj_response.success:=($Obj_request.email=("@"+Char(At sign)+"4d.com"))

 

    Else //Development version

 

  //Allow all adress for testing purposes

       $Obj_response.success:=True

 

    End if

 

    If($Obj_response.success)

 

  //Optional welcome message to display on mobile App.

       $Obj_response.statusText:="Authentication successful"

 

    Else

 

       $Obj_response.statusText:=$Obj_request.email+" is not an authorized email address."

 

    End if

 End if

 

  // Get App information if identification is needed (optional)

 If($Obj_request.application#Null)

    $Txt_appID:=$Obj_request.application.id // App Id

    $Txt_appName:=$Obj_request.application.name //App Name

    $Txt_appVersion:=$Obj_request.application.version // App Version

 End if

 

  //Get Device information if identification is needed (optional)

 If($Obj_request.device#Null)

    $Txt_device:=$Obj_request.device.description //Device Description

    $Txt_deviceID:=$Obj_request.device.id //Device Id

    $Txt_osVersion:=$Obj_request.device.version //System Version

    $Boo_simulator:=$Obj_request.device.simulator //True if device is a Simulator

 End if

 

  //Get the Team information if needed (optional)

 If($Obj_request.team#Null)

    $Txt_teamID:=$Obj_request.team.id //Team Id

 End if

 

  //Get the User Language information (optional)

 If($Obj_request.language#Null)

    $Txt_languageCode:=$Obj_request.language.Code

    $Txt_languageId:=$Obj_request.language.id

    $Txt_languageRegion:=$Obj_request.language.region

 End if

 

  //Get the session information

 If($Obj_request.session#Null)

  //Could be stored for future use.

    $Txt_sessionId:=$Obj_request.session.id //UUID created for this authentication

    $Txt_IP:=$Obj_request.session.ip //IP address

 End if

 

  //Get the App parameters

 If($Obj_request.parameters#Null)

  //Any additional information that could be added by mobile app for custom use (C_OBJECT)

 End if

 

 $0:=$Obj_response