FaceID dialog does not show up in rare cases #93
Description
We have an issue that the Face ID dialog is not showing up in rare cases.
The issue seems to be that the function laContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics returns an error "User interaction is required" (code: -1004).
The problem is prevented by creating a dedicated instance of LAContext just for the above check. https://stackoverflow.com/questions/35094167/lacontext-evaluatepolicy-does-not-always-prompt-user
- (void) verifyFingerprintWithCustomPasswordFallback:(NSString*)callbackId withMessage:(NSString*)message andEnterPasswordLabel:(NSString*)enterPasswordLabel {
if (NSClassFromString(@"LAContext") == NULL) {
[self.commandDelegate sendPluginResult:[CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR]
callbackId:callbackId];
return;
}
[self.commandDelegate runInBackground:^{
NSError *error = nil;
LAContext *laContext = [[LAContext alloc] init];
if (![laContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
[self.commandDelegate sendPluginResult:[CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR messageAsString:[error localizedDescription]]
callbackId:callbackId];
return;
}
// if we add a 'verifyFingerprintWithOptions' method we can add stuff like this:
// the nr of seconds you allow to reuse the last touchid device unlock (default 0, so never reuse)
// laContext.touchIDAuthenticationAllowableReuseDuration = 30;
// ################################################################################
// ###### This seems to fix the problem: use this instance for further calls ######
LAContext *laContextEvaluate = [[LAContext alloc] init];
// this replaces the default 'Enter password' button label
if (enterPasswordLabel != nil) {
laContextEvaluate.localizedFallbackTitle = enterPasswordLabel;
}
[laContextEvaluate evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:message reply:^(BOOL authOK, NSError *error) {
if (authOK) {
[self.commandDelegate sendPluginResult:[CDVPluginResult resultWithStatus:CDVCommandStatus_OK]
callbackId:callbackId];
} else {
// invoked when the scan failed 3 times in a row, the cancel button was pressed, or the 'enter password' button was pressed
NSArray *errorKeys = @[@"code", @"localizedDescription"];
[self.commandDelegate sendPluginResult:[CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR
messageAsDictionary:[error dictionaryWithValuesForKeys:errorKeys]]
callbackId:callbackId];
}
}];
}];
}
Another way would be to call evaluatePolicy twice, which also works but doesn't feel right.