Introduce new approach for ios integration

* ruby scripts were refactored
* environment values are now exposed to Info.plist via xcconfig file
* environment values became available in Build Settings
* cocoapods integration fixed - no need to add custom code to Podfile!
(as suggested in this PR: https://github.com/luggit/react-native-config/pull/329)

README.md

@@ -4,7 +4,6 @@ Module to expose config variables to your javascript code in React Native, suppo
 
 Bring some [12 factor](http://12factor.net/config) love to your mobile apps!
 
-
 ## Basic Usage
 
 Create a new file `.env` in the root of your React Native app:
@@ -17,15 +16,14 @@ GOOGLE_MAPS_API_KEY=abcdefgh
 Then access variables defined there from your app:
 
 ```js
-import Config from 'react-native-config'
+import Config from "react-native-config";
 
-Config.API_URL  // 'https://myapi.com'
+Config.API_URL; // 'https://myapi.com'
-Config.GOOGLE_MAPS_API_KEY  // 'abcdefgh'
+Config.GOOGLE_MAPS_API_KEY; // 'abcdefgh'
 ```
 
 Keep in mind this module doesn't obfuscate or encrypt secrets for packaging, so **do not store sensitive keys in `.env`**. It's [basically impossible to prevent users from reverse engineering mobile app secrets](https://rammic.github.io/2015/07/28/hiding-secrets-in-android-apps/), so design your app (and APIs) with that in mind.
 
-
 ## Setup
 
 Install the package:
@@ -40,6 +38,11 @@ Link the library:
 $ react-native link react-native-config
 ```
 
+if cocoapods are used in the project then pod has to be installed as well:
+
+```
+(cd ios; pod install)
+```
 
 ### Extra step for Android
 
@@ -50,17 +53,6 @@ You'll also need to manually apply a plugin to your app, from `android/app/build
 apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"
 ```
 
-
-### Extra step for iOS (support Info.plist)
-
-* Go to your project -> Build Settings -> All
-* Search for "preprocess"
-* Set `Preprocess Info.plist File` to `Yes`
-* Set `Info.plist Preprocessor Prefix File` to `${BUILD_DIR}/GeneratedInfoPlistDotEnv.h`
-* Set `Info.plist Other Preprocessor Flags` to `-traditional`
-* If you don't see those settings, verify that "All" is selected at the top (instead of "Basic")
-
-
 #### Advanced Android Setup
 
 In `android/app/build.gradle`, if you use `applicationIdSuffix` or `applicationId` that is different from the package name indicated in `AndroidManifest.xml` in `<manifest package="...">` tag, for example, to support different build variants:
@@ -125,14 +117,27 @@ NSString *apiUrl = [ReactNativeConfig envFor:@"API_URL"];
 NSDictionary *config = [ReactNativeConfig env];
 ```
 
-They're also available for configuration in `Info.plist`, by prepending `__RN_CONFIG_` to their name:
+#### Availability in Build settings and Info.plist
+
+With one extra step environment values can be exposed to "Info.plist" and Build settings in the native project.
+
+1. click on the file tree and create new file of type XCConfig
+   ![img](./readme-pics/1.ios_new_file.png)
+   ![img](./readme-pics/2.ios_file_type.png)
+2. save it under `ios` folder as "Config.xcconfig" with the following content:
 
 ```
-__RN_CONFIG_API_URL
+#include? "tmp.xcconfig"
 ```
 
-Note: Requires specific setup (see below) and a `Product > Clean` is required after changing the values to see the updated values.
+3. go to project settings
+4. apply config to your configurations
+   ![img](./readme-pics/3.ios_apply_config.png)
+5. create new build phase for the scheme which will generate "tmp.xcconfig" before each build exposing values to Build Settings and Info.plist<sup>this has to be placed after custom env file explained [here](#ios-multi-scheme)</sup>:
 
+```
+"${SRCROOT}/../node_modules/react-native-config/ios/ReactNativeConfig/BuildXCConfig.rb" "${SRCROOT}/.." "${SRCROOT}/tmp.xcconfig"
+```
 
 ### Different environments
 
@@ -150,7 +155,6 @@ $ env:ENVFILE=".env.staging"; react-native run-ios    # powershell
 
 This also works for `run-android`. Alternatively, there are platform-specific options below.
 
-
 #### Android
 
 The same environment variable can be used to assemble releases with a different config:
@@ -171,9 +175,10 @@ project.ext.envConfigFiles = [
 apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"
 ```
 
-
 #### iOS
 
+<a name="ios-multi-scheme"></a>
+
 The basic idea in iOS is to have one scheme per environment file, so you can easily alternate between them.
 
 Start by creating a new scheme:

ios/ReactNativeConfig.xcodeproj/project.pbxproj

@@ -57,9 +57,11 @@
 
 /* Begin PBXFileReference section */
 		3DF7F6AC203AA09B00D0EAB7 /* libReactNativeConfig-tvOS.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = "libReactNativeConfig-tvOS.a"; sourceTree = BUILT_PRODUCTS_DIR; };
+		50406729228CAD5A00E0438A /* ReadDotEnv.rb */ = {isa = PBXFileReference; lastKnownFileType = text.script.ruby; path = ReadDotEnv.rb; sourceTree = "<group>"; };
+		50830C45228DD3D000CEA8FC /* BuildXCConfig.rb */ = {isa = PBXFileReference; lastKnownFileType = text.script.ruby; path = BuildXCConfig.rb; sourceTree = "<group>"; };
 		EB2648DF1C7BE17A00B8F155 /* libReactNativeConfig.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libReactNativeConfig.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		EB2648E21C7BE17A00B8F155 /* ReactNativeConfig.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ReactNativeConfig.h; sourceTree = "<group>"; };
-		EBE4E8291C7BF6DD000F8875 /* BuildDotenvConfig.ruby */ = {isa = PBXFileReference; lastKnownFileType = text.script.sh; path = BuildDotenvConfig.ruby; sourceTree = "<group>"; };
+		EBE4E8291C7BF6DD000F8875 /* BuildDotenvConfig.rb */ = {isa = PBXFileReference; lastKnownFileType = text.script.ruby; path = BuildDotenvConfig.rb; sourceTree = "<group>"; };
 		EBE4E8461C7D2456000F8875 /* ReactNativeConfig.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ReactNativeConfig.m; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
@@ -101,9 +103,11 @@
 		EB2648E11C7BE17A00B8F155 /* ReactNativeConfig */ = {
 			isa = PBXGroup;
 			children = (
+				50830C45228DD3D000CEA8FC /* BuildXCConfig.rb */,
 				EB2648E21C7BE17A00B8F155 /* ReactNativeConfig.h */,
 				EBE4E8461C7D2456000F8875 /* ReactNativeConfig.m */,
-				EBE4E8291C7BF6DD000F8875 /* BuildDotenvConfig.ruby */,
+				EBE4E8291C7BF6DD000F8875 /* BuildDotenvConfig.rb */,
+				50406729228CAD5A00E0438A /* ReadDotEnv.rb */,
 			);
 			path = ReactNativeConfig;
 			sourceTree = "<group>";
@@ -172,6 +176,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 			);
 			mainGroup = EB2648D61C7BE17A00B8F155;
@@ -192,13 +197,13 @@
 			files = (
 			);
 			inputPaths = (
-				"$(SRCROOT)/ReactNativeConfig/BuildDotenvConfig.ruby",
+				"$(SRCROOT)/ReactNativeConfig/BuildDotenvConfig.rb",
 			);
 			outputPaths = (
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = ./ReactNativeConfig/BuildDotenvConfig.ruby;
+			shellScript = "./ReactNativeConfig/BuildDotenvConfig.rb\n";
 		};
 		EBE4E8281C7BF689000F8875 /* ShellScript */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -206,13 +211,13 @@
 			files = (
 			);
 			inputPaths = (
-				"$(SRCROOT)/ReactNativeConfig/BuildDotenvConfig.ruby",
+				"$(SRCROOT)/ReactNativeConfig/BuildDotenvConfig.rb",
 			);
 			outputPaths = (
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = ./ReactNativeConfig/BuildDotenvConfig.ruby;
+			shellScript = "set -xe\necho \"$SRCROOT\"\n./ReactNativeConfig/BuildDotenvConfig.rb \"$SRCROOT/../../..\" \"$SRCROOT/ReactNativeConfig/\"\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 

ios/ReactNativeConfig/BuildDotenvConfig.rb

@@ -0,0 +1,30 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require_relative 'ReadDotEnv'
+
+envs_root = ARGV[0]
+m_output_path = ARGV[1]
+puts "reading env file from #{envs_root} and writing .m to #{m_output_path}"
+
+# Allow utf-8 charactor in config value
+# For example, APP_NAME=中文字符
+Encoding.default_external = Encoding::UTF_8
+Encoding.default_internal = Encoding::UTF_8
+
+dotenv, custom_env = read_dot_env(envs_root)
+puts "read dotenv #{dotenv}"
+
+# create obj file that sets DOT_ENV as a NSDictionary
+dotenv_objc = dotenv.map { |k, v| %(@"#{k}":@"#{v.chomp}") }.join(',')
+template = <<EOF
+  #define DOT_ENV @{ #{dotenv_objc} };
+EOF
+
+# write it so that ReactNativeConfig.m can return it
+path = File.join(m_output_path, 'GeneratedDotEnv.m')
+File.open(path, 'w') { |f| f.puts template }
+
+File.delete('/tmp/envfile') if custom_env
+
+puts "Wrote to #{path}"

ios/ReactNativeConfig/BuildDotenvConfig.ruby

@@ -1,79 +0,0 @@
-#!/usr/bin/env ruby
-
-# Allow utf-8 charactor in config value
-# For example, APP_NAME=中文字符
-Encoding.default_external = Encoding::UTF_8
-Encoding.default_internal = Encoding::UTF_8
-
-defaultEnvFile = ".env"
-
-# pick a custom env file if set
-if File.exists?("/tmp/envfile")
-  custom_env = true
-  file = File.read("/tmp/envfile").strip
-else
-  custom_env = false
-  file = ENV["ENVFILE"] || defaultEnvFile
-end
-
-puts "Reading env from #{file}"
-
-dotenv = begin
-  # https://regex101.com/r/cbm5Tp/1
-  dotenv_pattern = /^(?:export\s+|)(?<key>[[:alnum:]_]+)=((?<quote>["'])?(?<val>.*?[^\\])\k<quote>?|)$/
-
-  # find that above node_modules/react-native-config/ios/
-  path = File.join(Dir.pwd, "../../../#{file}")
-  if File.exists?(path)
-    raw = File.read(path)
-  elsif File.exists?(file)
-    raw = File.read(file)
-  else
-    defaultEnvPath = File.join(Dir.pwd, "../../../#{defaultEnvFile}")
-    if !File.exists?(defaultEnvPath)
-      # try as absolute path
-      defaultEnvPath = defaultEnvFile
-    end
-    defaultRaw = File.read(defaultEnvPath)
-    if (defaultRaw)
-      raw = defaultRaw + "\n" + raw
-    end
-  end
-
-  raw.split("\n").inject({}) do |h, line|
-    m = line.match(dotenv_pattern)
-    next h if m.nil?
-    key = m[:key]
-    # Ensure string (in case of empty value) and escape any quotes present in the value.
-    val = m[:val].to_s.gsub('"', '\"')
-    h.merge(key => val)
-  end
-rescue Errno::ENOENT
-  puts("**************************")
-  puts("*** Missing .env file ****")
-  puts("**************************")
-  {} # set dotenv as an empty hash
-end
-
-# create obj file that sets DOT_ENV as a NSDictionary
-dotenv_objc = dotenv.map { |k, v| %Q(@"#{k}":@"#{v.chomp}") }.join(",")
-template = <<EOF
-  #define DOT_ENV @{ #{dotenv_objc} };
-EOF
-
-# write it so that ReactNativeConfig.m can return it
-path = File.join(ENV["SYMROOT"], "GeneratedDotEnv.m")
-File.open(path, "w") { |f| f.puts template }
-
-# create header file with defines for the Info.plist preprocessor
-info_plist_defines_objc = dotenv.map { |k, v| %Q(#define __RN_CONFIG_#{k}  #{v}) }.join("\n")
-
-# write it so the Info.plist preprocessor can access it
-path = File.join(ENV["BUILD_DIR"], "GeneratedInfoPlistDotEnv.h")
-File.open(path, "w") { |f| f.puts info_plist_defines_objc }
-
-if custom_env
-  File.delete("/tmp/envfile")
-end
-
-puts "Wrote to #{path}"

ios/ReactNativeConfig/BuildXCConfig.rb

@@ -0,0 +1,13 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require_relative 'ReadDotEnv'
+
+envs_root = ARGV[0]
+config_output = ARGV[1]
+puts "reading env file from #{envs_root} and writing .config to #{config_output}"
+
+dotenv, custom_env = read_dot_env(envs_root)
+
+dotenv_xcconfig = dotenv.map { |k, v| %(#{k}=#{v}) }.join("\n")
+File.open(config_output, 'w') { |f| f.puts dotenv_xcconfig }

ios/ReactNativeConfig/ReadDotEnv.rb

@@ -0,0 +1,58 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Allow utf-8 charactor in config value
+# For example, APP_NAME=中文字符
+Encoding.default_external = Encoding::UTF_8
+Encoding.default_internal = Encoding::UTF_8
+
+# TODO: introduce a parameter which controls how to build relative path
+def read_dot_env(envs_root)
+  defaultEnvFile = '.env'
+  puts "going to read env file from root folder #{envs_root}"
+
+  # pick a custom env file if set
+  if File.exist?('/tmp/envfile')
+    custom_env = true
+    file = File.read('/tmp/envfile').strip
+  else
+    custom_env = false
+    file = ENV['ENVFILE'] || defaultEnvFile
+  end
+
+  dotenv = begin
+    # https://regex101.com/r/cbm5Tp/1
+    dotenv_pattern = /^(?:export\s+|)(?<key>[[:alnum:]_]+)=((?<quote>["'])?(?<val>.*?[^\\])\k<quote>?|)$/
+
+    path = File.expand_path(File.join(envs_root, file.to_s))
+    if File.exist?(path)
+      raw = File.read(path)
+    elsif File.exist?(file)
+      raw = File.read(file)
+    else
+      defaultEnvPath = File.expand_path(File.join(envs_root, "../#{defaultEnvFile}"))
+      unless File.exist?(defaultEnvPath)
+        # try as absolute path
+        defaultEnvPath = defaultEnvFile
+      end
+      defaultRaw = File.read(defaultEnvPath)
+      raw = defaultRaw + "\n" + raw if defaultRaw
+    end
+
+    raw.split("\n").inject({}) do |h, line|
+      m = line.match(dotenv_pattern)
+      next h if m.nil?
+
+      key = m[:key]
+      # Ensure string (in case of empty value) and escape any quotes present in the value.
+      val = m[:val].to_s.gsub('"', '\"')
+      h.merge(key => val)
+    end
+    rescue Errno::ENOENT
+      puts('**************************')
+      puts('*** Missing .env file ****')
+      puts('**************************')
+      return [{}, false] # set dotenv as an empty hash
+  end
+  [dotenv, custom_env]
+end

react-native-config.podspec

@@ -1,23 +1,35 @@
-require "json"
+# frozen_string_literal: true
 
-package = JSON.parse(File.read(File.join(__dir__, "package.json")))
+require 'json'
+
+package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
 
 Pod::Spec.new do |s|
-  s.name         = "react-native-config"
+  s.name         = 'react-native-config'
-  s.version      = package["version"]
+  s.version      = package['version']
-  s.summary      = "Expose config variables to React Native apps"
+  s.summary      = 'Expose config variables to React Native apps'
-  s.author       = "Pedro Belo"
+  s.author       = 'Pedro Belo'
 
-  s.homepage     = "https://github.com/luggit/react-native-config"
+  s.homepage     = 'https://github.com/luggit/react-native-config'
 
-  s.license      = "MIT"
+  s.license      = 'MIT'
-  s.ios.deployment_target = "7.0"
+  s.ios.deployment_target = '7.0'
-  s.tvos.deployment_target = "9.0"
+  s.tvos.deployment_target = '9.0'
 
-  s.source       = { :git => "https://github.com/luggit/react-native-config.git", :tag => "#{s.version}" }
+  s.source       = { git: 'https://github.com/luggit/react-native-config.git', tag: s.version.to_s }
+  s.script_phase = {
+    name: 'Config codegen',
+    script: %(
+set -ex
+HOST_PATH="$SRCROOT/../.."
+"${PODS_TARGET_SRCROOT}/ios/ReactNativeConfig/BuildDotenvConfig.rb" "$HOST_PATH" "${PODS_TARGET_SRCROOT}/ios/ReactNativeConfig"
+),
+    execution_position: :before_compile,
+    input_files: ['$(SRCROOT)/ReactNativeConfig/BuildDotenvConfig.rb']
+  }
 
-  s.source_files  = "ios/**/*.{h,m}"
+  s.source_files = 'ios/**/*.{h,m}'
   s.requires_arc = true
 
-  s.dependency "React"
+  s.dependency 'React'
 end