Change device metadata from struct to proto.

PiperOrigin-RevId: 463583244

presence/BUILD

@@ -135,6 +135,9 @@ cc_library(
     visibility = [
         "//third_party/nearby:__subpackages__",
     ],
+    deps = [
+        "//third_party/nearby/presence/proto:device_metadata_cc_proto",
+    ],
 )
 
 cc_test(

presence/credential.h

@@ -19,6 +19,8 @@
 #include <string>
 #include <vector>
 
+#include "third_party/nearby/presence/proto/device_metadata.pb.h"
+
 namespace nearby {
 namespace presence {
 
@@ -38,30 +40,6 @@ enum class TrustType {
   kPublic = 4,
 };
 
-enum class DeviceType {
-  kUnspecified = 0,
-  kPhone = 1,
-  kTablet = 2,
-  kDisplay = 3,
-  kLaptop = 4,
-  kTV = 5,
-  kWatch = 6,
-};
-
-struct DeviceMetadata {
-  // Stable device identifier that does not rotate for a few months.
-  std::string stable_device_id;
-  // The account name which created the certificate.
-  std::string account_name;
-  // The name of the local device when the certificate is created.
-  std::string device_name;
-  // The icon url of the user whose device created the certificate.
-  std::string icon_url;
-  // The Bluetooth MAC address of the device which created the certificate.
-  std::string bluetooth_mac_address;
-  DeviceType device_type;
-};
-
 struct PrivateCredential {
   TrustType trust_type;
 
@@ -91,7 +69,7 @@ struct PrivateCredential {
   // The aes key to encrypt DeviceMetadata in public credential.
   std::vector<uint8_t> metadata_encryption_key;
 
-  DeviceMetadata device_metadata;
+  proto::DeviceMetadata device_metadata;
 };
 
 struct PublicCredential {

presence/implementation/credential_manager.h

@@ -52,7 +52,7 @@ class CredentialManager {
   // The user’s own public credentials won’t be saved on local credential
   // storage.
   void GenerateCredentials(
-      DeviceMetadata device_metadata, std::vector<TrustType> trust_types,
+      proto::DeviceMetadata device_metadata, std::vector<TrustType> trust_types,
       GenerateCredentialsCallback credentials_generated_cb);
 
   // Update remote public credentials.

presence/proto/BUILD

@@ -0,0 +1,12 @@
+proto_library(
+    name = "device_metadata_proto",
+    srcs = ["device_metadata.proto"],
+)
+
+cc_proto_library(
+    name = "device_metadata_cc_proto",
+    visibility = [
+        "//third_party/nearby:__subpackages__",
+    ],
+    deps = [":device_metadata_proto"],
+)

presence/proto/device_metadata.proto

@@ -0,0 +1,34 @@
+syntax = "proto2";
+
+package nearby.presence.proto;
+
+// A proto to store the local device's metadata.
+message DeviceMetadata {
+  // Stable device identifier that does not rotate for a few months.
+  optional string stable_device_id = 1;
+
+  // The account name which created the credential.
+  optional string account_name = 2;
+
+  // The name of the local device when the credential is created.
+  optional string device_name = 3;
+
+  // The icon url of the user whose device created the certificate.
+  optional string icon_url = 4;
+
+  // The Bluetooth MAC address of the device which created the certificate.
+  optional string bluetooth_mac_address = 5;
+
+  /** The version of the frame. */
+  enum DeviceType {
+    UNSPECIFIED = 0;
+    PHONE = 1;
+    TABLET = 2;
+    DISPLAY = 3;
+    LAPTOP = 4;
+    TV = 5;
+    WATCH = 6;
+  }
+
+  optional DeviceType device_type = 6;
+}