Add local fork of the go-touchid library

go-touchid/go.mod

@@ -0,0 +1,3 @@
+module github.com/lox/go-touchid
+
+go 1.16

go-touchid/touchid.go

@@ -0,0 +1,60 @@
+package touchid
+
+// Forked from: https://github.com/lox/go-touchid
+// Commit 619cc8e578d0ef916aa29c806117c370f9d621cb
+// Unknown license.
+
+/*
+#cgo CFLAGS: -x objective-c -fmodules -fblocks
+#cgo LDFLAGS: -framework CoreFoundation -framework LocalAuthentication -framework Foundation
+#include <stdlib.h>
+#include <stdio.h>
+#import <LocalAuthentication/LocalAuthentication.h>
+
+int Authenticate(char const* reason) {
+  LAContext *myContext = [[LAContext alloc] init];
+  NSError *authError = nil;
+  dispatch_semaphore_t sema = dispatch_semaphore_create(0);
+  NSString *nsReason = [NSString stringWithUTF8String:reason];
+  __block int result = 0;
+
+  if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError]) {
+    [myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
+      localizedReason:nsReason
+      reply:^(BOOL success, NSError *error) {
+        if (success) {
+          result = 1;
+        } else {
+          result = 2;
+        }
+        dispatch_semaphore_signal(sema);
+      }];
+  }
+
+  dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
+  dispatch_release(sema);
+  return result;
+}
+*/
+import (
+	"C"
+)
+import (
+	"errors"
+	"unsafe"
+)
+
+func Authenticate(reason string) (bool, error) {
+	reasonStr := C.CString(reason)
+	defer C.free(unsafe.Pointer(reasonStr))
+
+	result := C.Authenticate(reasonStr)
+	switch result {
+	case 1:
+		return true, nil
+	case 2:
+		return false, nil
+	}
+
+	return false, errors.New("Error occurred accessing biometrics")
+}

go.mod

@@ -3,6 +3,7 @@ module github.com/jorgelbg/pinentry-touchid
 go 1.16
 
 replace github.com/foxcpp/go-assuan => ./go-assuan
+replace github.com/lox/go-touchid => ./go-touchid
 
 require (
 	github.com/enescakir/emoji v1.0.0 // indirect