OS.get_unique_id() returns empty string on Web target

[kxn]

Godot version

Godot v4.1.1.stable - Windows 10.0.22621 - Vulkan (Compatibility) - AMD Radeon RX 5700 XT (Advanced Micro Devices, Inc.; 31.0.21001.45002) - Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz (16 Threads)

System information

Godot v4.1.1.stable - Windows 10.0.22621 - Vulkan (Compatibility) - AMD Radeon RX 5700 XT (Advanced Micro Devices, Inc.; 31.0.21001.45002) - Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz (16 Threads)

Issue description

OS.get_unique_id() returns empty string

there is an error in developer console as well

Steps to reproduce

func _ready():
print(OS.get_unique_id())

Minimal reproduction project

not needed

[akien-mga]

Indeed OS.get_unique_id() is not implemented in platform/web/os_web.cpp, so it falls back to the default implementation in core/os/os.cpp which is just:

String OS::get_unique_id() const {
	ERR_FAIL_V("");
}

I vaguely remember that getting a unique ID on Web may not be possible by design, as it's considered a security issue to let websites identify and thus track users like this. But there should be a proper override that makes this clear, possibly by printing a more explicit error, and maybe a non-unique fallback value.

[AThousandShips]

This is also documented

[kxn]

Indeed OS.get_unique_id() is not implemented in platform/web/os_web.cpp, so it falls back to the default implementation in core/os/os.cpp which is just:

String OS::get_unique_id() const {
	ERR_FAIL_V("");
}

I vaguely remember that getting a unique ID on Web may not be possible by design, as it's considered a security issue to let websites identify and thus track users like this. But there should be a proper override that makes this clear, possibly by printing a more explicit error, and maybe a non-unique fallback value.

Agree that a non-unique fallback value would be better, e.g a random uuid