Add support for on-device conversions using hashed email address and phone number. (#1603)

* Add function header for hashed email address and phone number functions.

* Format code.

* Add integration test for hashed email/phone.

Add stub.

Fix header definition.

* Add missing header.

* Format code.

* Fix Doxygen.

* Add iOS implementation.

* Add iOS implementation.

* Format code.

* Add readme.

* Fix usage.

* Capitalize SHA

Author: jonsimantov

analytics/integration_test/src/integration_test.cc

@@ -220,6 +220,26 @@ TEST_F(FirebaseAnalyticsTest, TestSetProperties) {
       "my_email@site.com");
   firebase::analytics::InitiateOnDeviceConversionMeasurementWithPhoneNumber(
       "+15551234567");
+
+  std::vector<unsigned char> hashed_email = {
+      // SHA256-encoded "example@example.com"
+      0x31, 0xc5, 0x54, 0x3c, 0x17, 0x34, 0xd2, 0x5c, 0x72, 0x06, 0xf5,
+      0xfd, 0x59, 0x15, 0x25, 0xd0, 0x29, 0x5b, 0xec, 0x6f, 0xe8, 0x4f,
+      0xf8, 0x2f, 0x94, 0x6a, 0x34, 0xfe, 0x97, 0x0a, 0x1e, 0x66,
+  };
+
+  firebase::analytics::
+      InitiateOnDeviceConversionMeasurementWithHashedEmailAddress(hashed_email);
+
+  std::vector<unsigned char> hashed_phone = {
+      // SHA256-encoded "+12345556789"
+      0x12, 0x8c, 0x64, 0xfe, 0x24, 0x0f, 0x08, 0x75, 0xf5, 0x98, 0xc3,
+      0x48, 0x0e, 0xb0, 0x38, 0xd2, 0xe6, 0xb0, 0x05, 0xd1, 0xa0, 0x57,
+      0xb6, 0x21, 0x4a, 0xc2, 0x09, 0xf6, 0xe5, 0xc0, 0x68, 0x41,
+  };
+
+  firebase::analytics::
+      InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber(hashed_phone);
 }
 
 TEST_F(FirebaseAnalyticsTest, TestLogEvents) {

analytics/src/analytics_android.cc

@@ -451,6 +451,26 @@ void InitiateOnDeviceConversionMeasurementWithPhoneNumber(
   // No-op on Android
 }
 
+/// Initiates on-device conversion measurement given a hashed user email address
+/// on iOS (no-op on Android). On iOS, requires dependency
+/// GoogleAppMeasurementOnDeviceConversion to be linked in, otherwise it is a
+/// no-op.
+void InitiateOnDeviceConversionMeasurementWithHashedEmailAddress(
+    std::vector<unsigned char> hashed_email) {
+  FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
+  // No-op on Android
+}
+
+/// Initiates on-device conversion measurement given a hashed phone number on
+/// iOS (no-op on Android). On iOS, requires dependency
+/// GoogleAppMeasurementOnDeviceConversion to be linked in, otherwise it is a
+/// no-op.
+void InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber(
+    std::vector<unsigned char> hashed_phone) {
+  FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
+  // No-op on Android
+}
+
 // Set a user property to the given value.
 void SetUserProperty(const char* name, const char* value) {
   FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());

analytics/src/analytics_ios.mm

@@ -280,6 +280,30 @@ void InitiateOnDeviceConversionMeasurementWithPhoneNumber(const char* phone_numb
   [FIRAnalytics initiateOnDeviceConversionMeasurementWithPhoneNumber:@(phone_number)];
 }
 
+/// Initiates on-device conversion measurement given a hashed user email address
+/// on iOS (no-op on Android). On iOS, requires dependency
+/// GoogleAppMeasurementOnDeviceConversion to be linked in, otherwise it is a
+/// no-op.
+void InitiateOnDeviceConversionMeasurementWithHashedEmailAddress(
+    std::vector<unsigned char> hashed_email) {
+  FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
+  NSData* hashed_email_data =
+      firebase::util::BytesToNSData(hashed_email.data(), hashed_email.size());
+  [FIRAnalytics initiateOnDeviceConversionMeasurementWithHashedEmailAddress:hashed_email_data];
+}
+
+/// Initiates on-device conversion measurement given a hashed phone number on
+/// iOS (no-op on Android). On iOS, requires dependency
+/// GoogleAppMeasurementOnDeviceConversion to be linked in, otherwise it is a
+/// no-op.
+void InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber(
+    std::vector<unsigned char> hashed_phone) {
+  FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
+  NSData* hashed_phone_data =
+      firebase::util::BytesToNSData(hashed_phone.data(), hashed_phone.size());
+  [FIRAnalytics initiateOnDeviceConversionMeasurementWithHashedPhoneNumber:hashed_phone_data];
+}
+
 // Set a user property to the given value.
 void SetUserProperty(const char* name, const char* value) {
   FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());

analytics/src/analytics_stub.cc

@@ -106,6 +106,11 @@ void InitiateOnDeviceConversionMeasurementWithEmailAddress(
   FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
 }
 
+void InitiateOnDeviceConversionMeasurementWithHashedEmailAddress(
+    std::vector<unsigned char> email_address) {
+  FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
+}
+
 /// Initiates on-device conversion measurement given a phone number on iOS
 /// (no-op on Android). On iOS, requires dependency
 /// GoogleAppMeasurementOnDeviceConversion to be linked in, otherwise it is a
@@ -115,6 +120,11 @@ void InitiateOnDeviceConversionMeasurementWithPhoneNumber(
   FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
 }
 
+void InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber(
+    std::vector<unsigned char> phone_number_hash) {
+  FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());
+}
+
 // Set a user property to the given value.
 void SetUserProperty(const char* /*name*/, const char* /*value*/) {
   FIREBASE_ASSERT_RETURN_VOID(internal::IsInitialized());

analytics/src/include/firebase/analytics.h

@@ -21,6 +21,7 @@
 #include <cstdint>
 #include <map>
 #include <string>
+#include <vector>
 
 #include "firebase/app.h"
 #include "firebase/future.h"
@@ -503,6 +504,25 @@ void InitiateOnDeviceConversionMeasurementWithEmailAddress(
 void InitiateOnDeviceConversionMeasurementWithPhoneNumber(
     const char* phone_number);
 
+/// Initiates on-device conversion measurement given a SHA256-hashed user email
+/// address. Requires dependency GoogleAppMeasurementOnDeviceConversion to be
+/// linked in, otherwise it is a no-op.
+/// @param hashed_email_address User email address as a UTF8-encoded string
+/// normalized and hashed according to the instructions at
+/// https://firebase.google.com/docs/tutorials/ads-ios-on-device-measurement/step-3.
+void InitiateOnDeviceConversionMeasurementWithHashedEmailAddress(
+    std::vector<unsigned char> hashed_email_address);
+
+/// Initiates on-device conversion measurement given a SHA256-hashed phone
+/// number in E.164 format. Requires dependency
+/// GoogleAppMeasurementOnDeviceConversion to be linked in, otherwise it is a
+/// no-op.
+/// @param hashed_phone_number UTF8-encoded user phone number in E.164 format
+/// and then hashed according to the instructions at
+/// https://firebase.google.com/docs/tutorials/ads-ios-on-device-measurement/step-3.
+void InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber(
+    std::vector<unsigned char> hashed_phone_number);
+
 /// @brief Set a user property to the given value.
 ///
 /// Properties associated with a user allow a developer to segment users

app/src/util_ios.h

@@ -217,6 +217,9 @@ NSData *StringToNSData(const std::string &str);
 // Convert bytes to NSData.
 NSData *BytesToNSData(const char *bytes, const int len);
 
+// Convert bytes to NSData.
+NSData *BytesToNSData(const unsigned char *bytes, const int len);
+
 // Convert an NSData to std::string.
 std::string NSDataToString(NSData *data);
 

app/src/util_ios.mm

@@ -139,6 +139,10 @@ void ForEachAppDelegateClass(void (^block)(Class)) {
   return [NSData dataWithBytes:bytes length:len];
 }
 
+NSData *BytesToNSData(const unsigned char *bytes, const int len) {
+  return [NSData dataWithBytes:bytes length:len];
+}
+
 std::string NSDataToString(NSData *data) {
   return std::string(static_cast<const char *>(data.bytes), data.length);
 }

release_build_files/readme.md

@@ -631,6 +631,12 @@ workflow use only during the development of your app, not for publicly shipping
 code.
 
 ## Release Notes
+### Upcoming Release
+-   Changes
+    - Analytics (iOS): Add support for
+    `InitiateOnDeviceConversionMeasurementWithHashedEmailAddress` and
+    `InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber`.
+
 ### 12.0.0
 -   Changes
     - General (Android): Update to Firebase Android BoM version 33.0.0.