replacing Auth/FSTUser by C++ auth implementation (#804)

* replacing Auth/FSTUser by C++ auth implementation

* address changes

2 files changed, 24 insertions, 0 deletions

diff --git a/Firestore/core/src/firebase/firestore/auth/user.h b/Firestore/core/src/firebase/firestore/auth/user.h
index 58b8b55..cc7b66d 100644
--- a/Firestore/core/src/firebase/firestore/auth/user.h
+++ b/Firestore/core/src/firebase/firestore/auth/user.h
@@ -17,6 +17,11 @@
 #ifndef FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_USER_H_
 #define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_USER_H_
 
+#if defined(__OBJC__)
+#import <Foundation/Foundation.h>
+#include "Firestore/core/src/firebase/firestore/util/string_apple.h"
+#endif  // defined(__OBJC__)
+
 #include <string>
 
 #include "absl/strings/string_view.h"
@@ -38,6 +43,12 @@ class User {
   /** Construct an authenticated user with the given UID. */
   explicit User(const absl::string_view uid);
 
+#if defined(__OBJC__)
+  explicit User(NSString* uid)
+      : User(firebase::firestore::util::MakeStringView(uid)) {
+  }
+#endif  // defined(__OBJC__)
+
   const std::string& uid() const {
     return uid_;
   }
@@ -69,6 +80,14 @@ inline bool operator!=(const User& lhs, const User& rhs) {
   return !(lhs == rhs);
 }
 
+// Specializations of std::hash is prohibited. We define a hash function to be
+// passed through manually.
+struct HashUser {
+  inline int64_t operator()(const User& user) const {
+    return std::hash<std::string>{}(user.uid());
+  }
+};
+
 }  // namespace auth
 }  // namespace firestore
 }  // namespace firebase
diff --git a/Firestore/core/test/firebase/firestore/auth/user_test.cc b/Firestore/core/test/firebase/firestore/auth/user_test.cc
index a9f764d..7277283 100644
--- a/Firestore/core/test/firebase/firestore/auth/user_test.cc
+++ b/Firestore/core/test/firebase/firestore/auth/user_test.cc
@@ -49,6 +49,11 @@ TEST(User, Comparison) {
   EXPECT_NE(User("abc"), User("xyz"));
 }
 
+TEST(User, Hash) {
+  const HashUser hash;
+  EXPECT_EQ(hash(User("abc")), hash(User("abc")));
+}
+
 }  // namespace auth
 }  // namespace firestore
 }  // namespace firebase