add public headers checker

.travis.yml

@@ -18,6 +18,7 @@ before_install:
 script:
 - open -a "simulator" --args -CurrentDeviceUDID $SIMULATOR_ID
 - "./ci_scripts/check_version.rb"
+- "./ci_scripts/check_public_headers.rb"
 - '[ "$TEST_TYPE" != lint ] || ./ci_scripts/check_fauxpas.sh'
 - '[ "$TEST_TYPE" != tests ] || ./ci_scripts/run_tests.sh'
 - '[ "$TEST_TYPE" != installation_cocoapods ] || ./Tests/installation_tests/cocoapods/without_frameworks/test.sh'

Stripe/PublicHeaders/Stripe.h

@@ -34,3 +34,6 @@
 #import "UINavigationBar+Stripe_Theme.h"
 #import "STPUserInformation.h"
 #import "STPImageLibrary.h"
+#import "STPPaymentConfiguration.h"
+#import "STPAPIResponseDecodable.h"
+#import "STPFormEncodable.h"

ci_scripts/check_public_headers.rb

@@ -0,0 +1,46 @@
+#!/usr/bin/env ruby
+
+begin
+  gem "xcodeproj"
+rescue LoadError
+  system("gem install xcodeproj")
+  Gem.clear_paths
+end
+
+require 'xcodeproj'
+
+puts "Checking headers..."
+
+contents_of_stripe_dot_h = (File.readlines("Stripe/PublicHeaders/Stripe.h").map do |line|
+	/\#import \"(.*?)\"\n/.match(line)
+end.compact.map do |match|
+	match.captures.first
+end + ["Stripe.h"]).sort
+contents_of_public_headers_dir = Dir.glob("Stripe/PublicHeaders/*.h").map { |h| File.basename(h) }.sort
+
+if contents_of_public_headers_dir != contents_of_stripe_dot_h
+	likely_culprits = ([contents_of_stripe_dot_h - contents_of_public_headers_dir] + [contents_of_public_headers_dir - contents_of_stripe_dot_h]).uniq
+	abort("The contents of Stripe/PublicHeaders do not match what is #imported in Stripe/PublicHeaders/Stripe.h. Likely culprits: #{likely_culprits}.")
+end
+
+dynamic_framework_target = Xcodeproj::Project.open('Stripe.xcodeproj').targets.select { |t| t.name == 'StripeiOS' }.first
+dynamic_framework_public_headers = dynamic_framework_target.headers_build_phase.files.select do |f|
+	f.settings && f.settings["ATTRIBUTES"] == ["Public"]
+end.map(&:display_name).sort
+
+if contents_of_public_headers_dir != dynamic_framework_public_headers
+	likely_culprits = ([dynamic_framework_public_headers - contents_of_public_headers_dir] + [contents_of_public_headers_dir - dynamic_framework_public_headers]).uniq
+	abort("The contents of Stripe/PublicHeaders do not match the public headers of the StripeiOS target. Likely culprits: #{likely_culprits}.")
+end
+
+static_library_target = Xcodeproj::Project.open('Stripe.xcodeproj').targets.select { |t| t.name == 'StripeiOSStatic' }.first
+static_library_public_headers = static_library_target.headers_build_phase.files.select do |f|
+	f.settings && f.settings["ATTRIBUTES"] == ["Public"]
+end.map(&:display_name).sort
+
+if contents_of_public_headers_dir != static_library_public_headers
+	likely_culprits = ([static_library_public_headers - contents_of_public_headers_dir] + [contents_of_public_headers_dir - static_library_public_headers]).uniq
+	abort("The contents of Stripe/PublicHeaders do not match the public headers of the StripeiOSStatic target. Likely culprits: #{likely_culprits}.")
+end
+
+puts "Headers look good!"