Add switching firebase settings task

Assets/FirebaseConfig/development/GoogleService-Info_development.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <dict>
+        <key>BUNDLE_ID</key>
+        <string>com.example.app.dev</string>
+    </dict>
+</plist>

Assets/FirebaseConfig/development/google-services_development.json

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+{
+  "client": [
+    {
+      "client_info": {
+        "android_client_info": {
+          "package_name": "com.example.app.dev"
+        }
+      }
+    }
+  ]
+}

Assets/FirebaseConfig/release/GoogleService-Info_release.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <dict>
+        <key>BUNDLE_ID</key>
+        <string>com.example.app</string>
+    </dict>
+</plist>

Assets/FirebaseConfig/release/google-services_release.json

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+{
+  "client": [
+    {
+      "client_info": {
+        "android_client_info": {
+          "package_name": "com.example.app"
+        }
+      }
+    }
+  ]
+}

Packages/jp.co.cyberagent.buildmagic/BuildMagic/Editor/BuiltIn/CopyFirebaseConfigTask.cs

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+// --------------------------------------------------------------
+// Copyright 2024 CyberAgent, Inc.
+// --------------------------------------------------------------
+
+using System;
+using System.IO;
+using System.Xml;
+using UnityEditor;
+using UnityEngine;
+using Object = UnityEngine.Object;
+
+namespace BuildMagicEditor.BuiltIn
+{
+    [GenerateBuildTaskAccessories("Copy Firebase Config",
+        PropertyName = "BuildMagicEditor.BuiltIn.CopyFirebaseConfigTask")]
+    public class CopyFirebaseConfigTask : BuildTaskBase<IPreBuildContext>
+    {
+        private readonly string _destinationDirectory;
+        private readonly Object _googleServiceInfoPlist;
+        private readonly Object _googleServicesJson;
+
+        public CopyFirebaseConfigTask(string destinationDirectory, Object googleServiceInfoPlist,
+            Object googleServicesJson)
+        {
+            _googleServicesJson = googleServicesJson;
+            _googleServiceInfoPlist = googleServiceInfoPlist;
+            _destinationDirectory = destinationDirectory;
+        }
+
+        public override void Run(IPreBuildContext context)
+        {
+            var dest = Path.Combine("Assets", _destinationDirectory);
+            Directory.CreateDirectory(dest);
+
+            if (_googleServiceInfoPlist)
+            {
+                var source = AssetDatabase.GetAssetPath(_googleServiceInfoPlist);
+                {
+                    var bundleId = PlayerSettings.GetApplicationIdentifier(BuildTargetGroup.iOS);
+                    // It may contain multiple bundle ids
+                    if (!ContainsBundleIdGoogleServiceInfoPlist(source, bundleId))
+                        throw new InvalidOperationException(
+                            $"{source} does not contain the bundle id \"{bundleId}\" which is currently set to this project.");
+                }
+                File.Copy(AssetDatabase.GetAssetPath(_googleServiceInfoPlist),
+                    Path.Combine(dest, "GoogleService-Info.plist"), true);
+            }
+
+            if (_googleServicesJson)
+            {
+                var source = AssetDatabase.GetAssetPath(_googleServicesJson);
+                {
+                    var bundleId = PlayerSettings.GetApplicationIdentifier(BuildTargetGroup.Android);
+                    // It may contain multiple bundle ids
+                    if (!ContainsBundleIdGoogleServicesJson(source, bundleId))
+                        throw new InvalidOperationException(
+                            $"{source} does not contain the bundle id \"{bundleId}\" which is currently set to this project.");
+                }
+                File.Copy(source, Path.Combine(dest, "google-services.json"), true);
+            }
+
+            AssetDatabase.Refresh();
+        }
+
+        private bool ContainsBundleIdGoogleServiceInfoPlist(string path, string bundleId)
+        {
+            var doc = new XmlDocument();
+            using var reader = new StreamReader(path);
+            doc.Load(reader);
+            if (doc.SelectSingleNode("plist/dict") is not { } dictNode) return false;
+
+            for (var i = 0; i < dictNode.ChildNodes.Count; i++)
+            {
+                var node = dictNode.ChildNodes[i];
+                if (node.Name == "key" && node.InnerText == "BUNDLE_ID")
+                {
+                    var valueNode = dictNode.ChildNodes[i + 1];
+                    if (valueNode.Name != "string")
+                        continue;
+
+                    if (valueNode.InnerText == bundleId) return true;
+                }
+            }
+
+            return false;
+        }
+
+        private bool ContainsBundleIdGoogleServicesJson(string path, string bundleId)
+        {
+            var json = JsonUtility.FromJson<GoogleServicesJson>(File.ReadAllText(path));
+            foreach (var client in json.client)
+            {
+                var packageName = client.client_info.android_client_info.package_name;
+                if (packageName == bundleId) return true;
+            }
+
+            return false;
+        }
+
+        [Serializable]
+        private class GoogleServicesJson
+        {
+            public Client[] client;
+
+            [Serializable]
+            public class Client
+            {
+                public ClientInfo client_info;
+            }
+
+            [Serializable]
+            public class ClientInfo
+            {
+                public AndroidClientInfo android_client_info;
+            }
+
+            [Serializable]
+            public class AndroidClientInfo
+            {
+                public string package_name;
+            }
+        }
+    }
+}