[local_auth] Endorse macOS (#7274)

Updates the app-facing package to endorse `local_auth_darwin` as the macOS implementation, and require a version of that package with macOS support. Updates the README to indicate that macOS is supported. Adds macOS support to the example app (using `flutter create --platforms=macos .` in the example).

Fixes flutter/flutter#140685

packages/local_auth/local_auth/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.3.0
+
+* Adds endorsed macOS support.
+
 ## 2.2.0
 
 * Switches endorsed iOS implementation to `local_auth_darwin`.

packages/local_auth/local_auth/README.md

@@ -8,9 +8,9 @@ the user.
 On supported devices, this includes authentication with biometrics such as
 fingerprint or facial recognition.
 
-|             | Android   | iOS   | Windows     |
-|-------------|-----------|-------|-------------|
-| **Support** | SDK 16+\* | 12.0+ | Windows 10+ |
+|             | Android   | iOS   | macOS  | Windows     |
+|-------------|-----------|-------|--------|-------------|
+| **Support** | SDK 16+\* | 12.0+ | 10.14+ | Windows 10+ |
 
 ## Usage
 

packages/local_auth/local_auth/example/macos/.gitignore

@@ -0,0 +1,7 @@
+# Flutter-related
+**/Flutter/ephemeral/
+**/Pods/
+
+# Xcode-related
+**/dgph
+**/xcuserdata/

packages/local_auth/local_auth/example/macos/Flutter/Flutter-Debug.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

packages/local_auth/local_auth/example/macos/Flutter/Flutter-Release.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

packages/local_auth/local_auth/example/macos/Podfile

@@ -0,0 +1,40 @@
+platform :osx, '10.14'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'ephemeral', 'Flutter-Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure \"flutter pub get\" is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Flutter-Generated.xcconfig, then run \"flutter pub get\""
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_macos_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_macos_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_macos_build_settings(target)
+  end
+end