add endpoint for linting

Gemfile

@@ -6,6 +6,7 @@ gemspec
 gem 'travis-core',     github: 'travis-ci/travis-core'
 gem 'travis-support',  github: 'travis-ci/travis-support'
 gem 'travis-sidekiqs', github: 'travis-ci/travis-sidekiqs', require: nil, ref: 'cde9741'
+gem 'travis-yaml',     github: 'travis-ci/travis-yaml'
 gem 'sinatra'
 gem 'sinatra-contrib', require: nil #github: 'sinatra/sinatra-contrib', require: nil
 

Gemfile.lock

@@ -80,6 +80,12 @@ GIT
   specs:
     travis-support (0.0.1)
 
+GIT
+  remote: git://github.com/travis-ci/travis-yaml.git
+  revision: 7e6e31e82240e170ffc20dfd02c0353b3bd5d33b
+  specs:
+    travis-yaml (0.1.0)
+
 GIT
   remote: https://gist.github.com/4269321.git
   revision: 8e2d21b924a69dd48191df6a18e51769f5a88614
@@ -332,5 +338,6 @@ DEPENDENCIES
   travis-core!
   travis-sidekiqs!
   travis-support!
+  travis-yaml!
   unicorn
   yard-sinatra!

lib/travis/api/app/endpoint/lint.rb

@@ -0,0 +1,19 @@
+require 'travis/api/app'
+require 'travis/yaml'
+
+class Travis::Api::App
+  class Endpoint
+    class Lint < Endpoint
+      def lint
+        request.body.rewind
+        content  = params[:content] || request.body.read
+        parsed   = Travis::Yaml.parse(content)
+        warnings = parsed.nested_warnings.map { |k, m| { key: k, message: m } }
+        { lint: { warnings: warnings } }.to_json
+      end
+
+      post('/', scope: :public) { lint }
+      put('/',  scope: :public) { lint }
+    end
+  end
+end

spec/unit/endpoint/lint_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe Travis::Api::App::Endpoint::Lint do
+  let(:content) { "foo: bar" }
+  let(:body) { "{\"lint\":{\"warnings\":[{\"key\":[],\"message\":\"unexpected key \\\"foo\\\", dropping\"},{\"key\":[],\"message\":\"missing key \\\"language\\\", defaulting to \\\"ruby\\\"\"}]}}" }
+
+  it "accepts content in parameter" do
+    response = post('/lint', content: content)
+    response.should be_ok
+    response.body.should be == body
+  end
+
+  it "accepts content as body" do
+    response = put('/lint', content)
+    response.should be_ok
+    response.body.should be == body
+  end
+end