[Added] Add support for JSON reports [#161595251]

Signed-off-by: Parv Mital <pmital@pivotal.io>

lib/license_finder/cli/main.rb

@@ -17,7 +17,8 @@ class Main < Base
         'html' => HtmlReport,
         'markdown' => MarkdownReport,
         'csv' => CsvReport,
-        'xml' => XmlReport
+        'xml' => XmlReport,
+        'json' => JsonReport
       }.freeze
 
       class_option :go_full_version, desc: 'Whether dependency version should include full version. Only meaningful if used with a Go project. Defaults to false.'

lib/license_finder/report.rb

@@ -29,3 +29,4 @@ def sorted_dependencies
 require 'license_finder/reports/html_report'
 require 'license_finder/reports/markdown_report'
 require 'license_finder/reports/xml_report'
+require 'license_finder/reports/json_report'

lib/license_finder/reports/json_report.rb

@@ -0,0 +1,28 @@
+require 'csv'
+
+module LicenseFinder
+  class JsonReport < CsvReport
+    def initialize(dependencies, options)
+      super(dependencies, options)
+    end
+
+    def to_s
+      {dependencies: build_deps}.to_json
+    end
+
+    private
+
+    def build_deps
+      sorted_dependencies.map do |dep|
+        @columns.inject({}) do |memo, column|
+          memo[column] = send("format_#{column}", dep)
+          memo
+        end
+      end
+    end
+
+    def format_licenses(dep)
+      dep.missing? ? [] : dep.licenses.map(&:name)
+    end
+  end
+end

spec/lib/license_finder/reports/json_report_spec.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+require 'json'
+require 'spec_helper'
+
+module LicenseFinder
+  describe JsonReport do
+    it 'understands many columns' do
+      dep = Package.new('gem_a', '1.0', authors: 'the authors',
+                        description: 'A description', summary: 'A summary',
+                        homepage: 'http://homepage.example.com')
+      dep.decide_on_license(License.find_by_name('MIT'))
+      dep.decide_on_license(License.find_by_name('GPL'))
+      dep.whitelisted!
+      subject = described_class.new([dep], columns: %w[name version authors licenses approved summary description homepage])
+      expected = {
+          dependencies:
+             [
+                {
+                  name: 'gem_a', version: '1.0', authors: 'the authors', licenses: ['MIT','GPL'],
+                  approved: 'Approved', summary: 'A summary', description: 'A description', homepage: 'http://homepage.example.com'
+                }
+             ]
+        }.to_json
+
+      expect(subject.to_s).to eq(expected)
+    end
+  end
+end