1 files changed, 57 insertions, 0 deletions
diff --git a/Functions/FirebaseFunctions/FUNInstanceIDProxy.m b/Functions/FirebaseFunctions/FUNInstanceIDProxy.m
new file mode 100644
index 0000000..f89ec98
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNInstanceIDProxy.m
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Note: This is forked from FIRMessagingInstanceIDProxy.m
+
+#import "FUNInstanceIDProxy.h"
+
+@implementation FUNInstanceIDProxy
+
++ (nonnull instancetype)instanceIDProxy {
+  static id proxyInstanceID = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    Class instanceIDClass = NSClassFromString(@"FIRInstanceID");
+    if (!instanceIDClass) {
+      proxyInstanceID = nil;
+      return;
+    }
+    SEL instanceIDSelector = NSSelectorFromString(@"instanceID");
+    if (![instanceIDClass respondsToSelector:instanceIDSelector]) {
+      proxyInstanceID = nil;
+      return;
+    }
+    IMP instanceIDImp = [instanceIDClass methodForSelector:instanceIDSelector];
+    id (*instanceIDFunc)(id, SEL) = (void *)instanceIDImp;
+    proxyInstanceID = instanceIDFunc(instanceIDClass, instanceIDSelector);
+  });
+  return (FUNInstanceIDProxy *)proxyInstanceID;
+}
+
+#pragma mark - Tokens
+
+- (nullable NSString *)token {
+  id proxy = [[self class] instanceIDProxy];
+  SEL getTokenSelector = NSSelectorFromString(@"token");
+  if (![proxy respondsToSelector:getTokenSelector]) {
+    return nil;
+  }
+  IMP getTokenIMP = [proxy methodForSelector:getTokenSelector];
+  NSString *(*getToken)(id, SEL) = (void *)getTokenIMP;
+  return getToken(proxy, getTokenSelector);
+}
+
+@end