Auto retrieve version to report user agent (firebase#1748)

* Auto retrieve version to report user agent

.gitignore

@@ -32,4 +32,3 @@ GeneratedPluginRegistrant.m
 GeneratedPluginRegistrant.java
 build/
 .flutter-plugins
-

packages/firebase_remote_config/.gitignore

@@ -0,0 +1 @@
+ios/Classes/UserAgent.h

packages/firebase_remote_config/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.2.0+3
+
+* Automatically use version from pubspec.yaml when reporting usage to Firebase.
+
 ## 0.2.0+2
 
 * Add missing template type parameter to `invokeMethod` calls.

packages/firebase_remote_config/android/build.gradle

@@ -46,6 +46,9 @@ android {
     }
     dependencies {
         api 'com.google.firebase:firebase-config:16.4.1'
+        implementation 'com.google.firebase:firebase-common:16.1.0'
         implementation 'androidx.annotation:annotation:1.0.0'
     }
 }
+
+apply from: file("./user-agent.gradle")

packages/firebase_remote_config/android/src/main/AndroidManifest.xml

@@ -1,3 +1,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="io.flutter.plugins.firebase.firebaseremoteconfig">
+    <application>
+        <service android:name="com.google.firebase.components.ComponentDiscoveryService">
+            <meta-data android:name="com.google.firebase.components:io.flutter.plugins.firebase.firebaseremoteconfig.FlutterFirebaseAppRegistrar"
+                android:value="com.google.firebase.components.ComponentRegistrar" />
+        </service>
+    </application>
 </manifest>

packages/firebase_remote_config/android/src/main/java/io/flutter/plugins/firebase/firebaseremoteconfig/FlutterFirebaseAppRegistrar.java

@@ -0,0 +1,15 @@
+package io.flutter.plugins.firebase.firebaseremoteconfig;
+
+import com.google.firebase.components.Component;
+import com.google.firebase.components.ComponentRegistrar;
+import com.google.firebase.platforminfo.LibraryVersionComponent;
+import java.util.Collections;
+import java.util.List;
+
+public class FlutterFirebaseAppRegistrar implements ComponentRegistrar {
+  @Override
+  public List<Component<?>> getComponents() {
+    return Collections.<Component<?>>singletonList(
+        LibraryVersionComponent.create(BuildConfig.LIBRARY_NAME, BuildConfig.LIBRARY_VERSION));
+  }
+}

packages/firebase_remote_config/android/user-agent.gradle

@@ -0,0 +1,22 @@
+import java.util.regex.Matcher
+import java.util.regex.Pattern
+
+String libraryVersionName = "UNKNOWN"
+String libraryName = "flutter-fire-rc"
+File pubspec = new File(project.projectDir.parentFile,  'pubspec.yaml')
+
+if (pubspec.exists()) {
+    String yaml = pubspec.text
+    // Using \s*['|"]?([^\n|'|"]*)['|"]? to extract version number.
+    Matcher versionMatcher = Pattern.compile("^version:\\s*['|\"]?([^\\n|'|\"]*)['|\"]?\$", Pattern.MULTILINE).matcher(yaml)
+    if (versionMatcher.find()) libraryVersionName = versionMatcher.group(1).replaceAll("\\+", "-")
+}
+
+android {
+    defaultConfig {
+        // BuildConfig.VERSION_NAME
+        buildConfigField 'String', 'LIBRARY_VERSION', "\"${libraryVersionName}\""
+        // BuildConfig.LIBRARY_NAME
+        buildConfigField 'String', 'LIBRARY_NAME', "\"${libraryName}\""
+    }
+}

packages/firebase_remote_config/ios/Classes/FirebaseRemoteConfigPlugin.m

@@ -1,4 +1,5 @@
 #import "FirebaseRemoteConfigPlugin.h"
+#import "UserAgent.h"
 
 #import <Firebase/Firebase.h>
 
@@ -14,6 +15,11 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
                                   binaryMessenger:[registrar messenger]];
   FirebaseRemoteConfigPlugin *instance = [[FirebaseRemoteConfigPlugin alloc] init];
   [registrar addMethodCallDelegate:instance channel:channel];
+
+  SEL sel = NSSelectorFromString(@"registerLibrary:withVersion:");
+  if ([FIRApp respondsToSelector:sel]) {
+    [FIRApp performSelector:sel withObject:LIBRARY_NAME withObject:LIBRARY_VERSION];
+  }
 }
 
 - (instancetype)init {

packages/firebase_remote_config/ios/firebase_remote_config.podspec

@@ -1,6 +1,11 @@
 #
 # To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
 #
+
+require 'yaml'
+pubspec = YAML.load_file(File.join('..', 'pubspec.yaml'))
+libraryVersion = pubspec['version'].gsub('+', '-')
+
 Pod::Spec.new do |s|
   s.name             = 'firebase_remote_config'
   s.version          = '0.0.1'
@@ -18,5 +23,11 @@ Firebase Remote Config plugin for Flutter.
   s.dependency 'Flutter'
   s.dependency 'Firebase/RemoteConfig'
   s.static_framework = true
+
+  s.prepare_command = <<-CMD
+      echo // Generated file, do not edit > Classes/UserAgent.h
+      echo "#define LIBRARY_VERSION @\\"#{libraryVersion}\\"" >> Classes/UserAgent.h
+      echo "#define LIBRARY_NAME @\\"flutter-fire-rc\\"" >> Classes/UserAgent.h
+    CMD
 end
 

packages/firebase_remote_config/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for Firebase Remote Config. Update your application
   re-releasing.
 author: Flutter Team <[email protected]>
 homepage: https://github.com/flutter/plugins/tree/master/packages/firebase_remote_config
-version: 0.2.0+2
+version: 0.2.0+3
 
 dependencies:
   flutter: