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Web: Clarify that OS.get_unique_id is not supported #82441

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Oct 2, 2023
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Web: Clarify that OS.get_unique_id is not supported #82441

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2 changes: 1 addition & 1 deletion core/os/os.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -355,7 +355,7 @@ void OS::set_cmdline(const char *p_execpath, const List<String> &p_args, const L
}

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

int OS::get_processor_count() const {
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2 changes: 1 addition & 1 deletion doc/classes/OS.xml
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Expand Up @@ -449,7 +449,7 @@
<description>
Returns a string that is unique to the device.
[b]Note:[/b] This string may change without notice if the user reinstalls/upgrades their operating system or changes their hardware. This means it should generally not be used to encrypt persistent data as the data saved before an unexpected ID change would become inaccessible. The returned string may also be falsified using external programs, so do not rely on the string returned by [method get_unique_id] for security purposes.
[b]Note:[/b] Returns an empty string on Web, as this method isn't implemented on this platform yet.
[b]Note:[/b] Returns an empty string and prints an error on Web, as this method cannot be implemented on this platform.
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That's my understanding at least, please confirm @Faless.

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Indeed, or at least, no intended way to do this.
User/Device fingerprinting is detrimental for privacy, so web browsers actively fight against it.
There a bunch of known fingerprinting techniques (see e.g. Canvas fingerprinting), but none of those are there on purpose, and might be mitigated by browsers in the future (to the point of breaking your app).
The way I see it, the only "proper" way to implement this, would be to randomly generate an ID, and store it in local storage / cookie / etc.
The ID will change if the user delete local storage and will be always different when using a private window.

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The way I see it, the only "proper" way to implement this, would be to randomly generate an ID, and store it in local storage / cookie / etc.
The ID will change if the user delete local storage and will be always different when using a private window.

That seems like an interesting compromise. I guess it would also mean have a different unique ID for each game, which might also be desired for privacy reason? You'll only be recognized by the game when you play that same game.

</description>
</method>
<method name="get_user_data_dir" qualifiers="const">
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4 changes: 4 additions & 0 deletions platform/web/os_web.cpp
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Expand Up @@ -132,6 +132,10 @@ int OS_Web::get_processor_count() const {
return godot_js_os_hw_concurrency_get();
}

String OS_Web::get_unique_id() const {
ERR_FAIL_V_MSG("", "OS::get_unique_id() is not available on the Web platform.");
}

bool OS_Web::_check_internal_feature_support(const String &p_feature) {
if (p_feature == "web") {
return true;
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1 change: 1 addition & 0 deletions platform/web/os_web.h
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Expand Up @@ -83,6 +83,7 @@ class OS_Web : public OS_Unix {
int get_process_id() const override;
bool is_process_running(const ProcessID &p_pid) const override;
int get_processor_count() const override;
String get_unique_id() const override;
int get_default_thread_pool_size() const override { return 1; }

String get_executable_path() const override;
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