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require 'rex/java'
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require 'stringio'
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load Metasploit::Framework.root.join('tools/exploit/java_deserializer.rb').to_path
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RSpec.describe JavaDeserializer do
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  before(:context) do
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    @out = $stdout
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    @err = $stderr
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    $stdout = StringIO.new
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    $stderr = StringIO.new
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  end
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  after(:context) do
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    $stdout = @out
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    $stderr = @err
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  end
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  subject(:deserializer) do
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    described_class.new
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  end
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  let(:valid_stream) do
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    "\xac\xed\x00\x05\x75\x72\x00\x02" +
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    "\x5b\x43\xb0\x26\x66\xb0\xe2\x5d" +
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    "\x84\xac\x02\x00\x00\x78\x70\x00" +
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    "\x00\x00\x02\x00\x61\x00\x62"
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  end
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  describe ".new" do
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    it "returns a JavaDeserializer instance" do
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      expect(deserializer).to be_a(JavaDeserializer)
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    end
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    it "initializes file to nil" do
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      expect(deserializer.file).to be_nil
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    end
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  end
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  describe "#run" do
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    context "when file is nil" do
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      it "returns nil" do
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        expect(deserializer.run).to be_nil
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      end
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    end
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    context "when file contains a valid stream" do
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      before(:example) do
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        $stdout.string = ''
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      end
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      context "when no options" do
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        it "prints the stream contents" do
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          expect(File).to receive(:new) do
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            contents = valid_stream
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            StringIO.new(contents)
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          end
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          deserializer.file = 'sample'
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          deserializer.run
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          expect($stdout.string).to include('[7e0001] NewArray { char, ["97", "98"] }')
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        end
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      end
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      context "when :array in options" do
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        it "prints the array contents" do
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          expect(File).to receive(:new) do
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            contents = valid_stream
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            StringIO.new(contents)
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          end
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          deserializer.file = 'sample'
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          deserializer.run({:array => '0'})
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          expect($stdout.string).to include('Array Type: char')
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        end
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      end
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    end
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    context "when file contains an invalid stream" do
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      it "prints the error while deserializing" do
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        expect(File).to receive(:new) do
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          contents = 'invalid_stream'
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          StringIO.new(contents)
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        end
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        deserializer.file = 'sample'
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        deserializer.run
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        expect($stdout.string).to include('[-] Failed to unserialize Stream')
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      end
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    end
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  end
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end
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