Learn to use the feature ‘'Should Append Parameters from URL with existing one to override’'.
It is possible to append CMD Line Arguments with existing ones. This can be used for authentication / token purposes.
Prerequisites
For this document, you need :
Access to the Control Panel ;
At least one uploaded application.
Instructions
Step 1. Prepare the setup
Follow this tutorial first then see the steps below.
STEP 2. Enter -green in the text field of Parameters to Pass to App. Click Save
Go to: Control Panel > Step 2: Config Selection > Edit > Developer Option > Parameters to Pass to App > Enter -green > Save.
Step 3. Enable Should append parameters from URL with existing one to override. Click Save
UE will receive the command during runtime. The color of the sphere should be green when you run the game.
Step 4. Open the game. Run to the 12th bay
Open the game to check the color of the sphere.
Go to: Control Panel > Step 3: Generate URLs > Play App > Run to the 12th bay
The color of the sphere changed to green.
Step 5. Copy the App URL
Go to : Control Panel > Step 3: Generate URLs > Copy App URL
This is the URL you would get:
https://connector.eagle3dstreaming.com/v5/demo/E3DSFeaturesTemplate/CmdLineDemo
Step 6. Add additional command lines to the copied App URL
Add '?exeLunchArgs=-[variable]' to the end of the URL.
For example:
Add '?exeLunchArgs=-blue' to the end of it like so :
https://connector.eagle3dstreaming.com/v5/demo/E3DSFeaturesTemplate/CmdLineDemo?exeLunchArgs=-blue
The system has now appended the additional command and has sent both the command added into the config and the command added into the URL to the UE game.
Example:
Step 6. Open the game. Run to the 12th bay
Open the game again to see the additional Command Lines you have added.
When you click on https://connector.eagle3dstreaming.com/v5/demo/E3DSFeaturesTemplate/CmdLineDemo?exeLunchArgs=-blue,
2 values will be getting parsed from two places in CMDLine arguments in the game.
Now that we are familiar with how the appending system works, we can explore how this is used for authentication.
Step 7. Authenticate by a user’s Email address
On the URL side, append the user’s email address to the URL, so that it looks like this:
(assuming that you know how to do this programmatically)
https://connector.eagle3dstreaming.com/v5/demo/E3DSFeaturesTemplate/CmdLineDemo?exeLunchArgs=-user=myEmailAddress@gmail.com
(this link will not work and is for demonstration purposes only).
By adding the email address into the URL (the '@' sign is an accepted character),
you will be able to pass the email address into your UE app where you can then proceed with the authentication.
Within the E3DSFeaturesTemplate App, there is a blueprint showing how to receive a value
(in the E3DSFeaturesTemplate example we show how to use the Command Line to get an IP Address for multiplayer).
Special data:
%ip_streamer% will pass the IP address of the machine where UE app is running
%ip_ss% will pass the IP address of the Signaling server
%port_streamer2ss% will pass the port of the Signaling server through which UE app communicates with the signaling server
Step 8. Add -bb=%ip_streamer% -aa=%ip_ss%:%port_streamer2ss%
Add these Commands in Parameters to Pass to App.
Step 9. Get this Output
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