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require 'spec_helper'
describe JSON::JWT do
let(:jwt) { JSON::JWT.new claims }
let(:jws) do
jwt.alg = :HS256
jws = JSON::JWS.new jwt
jws.signature = 'signature'
jws
end
let(:claims) do
{
iss: 'joe',
exp: 1300819380,
'http://example.com/is_root' => true
}.with_indifferent_access
end
let(:no_signed) do
'eyJ0eXAiOiJKV1QiLCJhbGciOiJub25lIn0.eyJpc3MiOiJqb2UiLCJleHAiOjEzMDA4MTkzODAsImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.'
end
context 'when not signed nor encrypted' do
it do
jwt.to_s.should == no_signed
end
end
describe '#content_type' do
it do
jwt.content_type.should == 'application/jwt'
end
end
describe '#sign' do
[:HS256, :HS384, :HS512].each do |algorithm|
context algorithm do
it do
jwt.sign(shared_secret, algorithm).should be_a JSON::JWS
end
end
end
[:RS256, :RS384, :RS512].each do |algorithm|
context algorithm do
it do
jwt.sign(private_key, algorithm).should be_a JSON::JWS
end
end
end
context 'when no algirithm specified' do
subject { jwt.sign(key) }
context 'when key is String' do
let(:key) { shared_secret }
its(:alg) { should == :HS256 }
end
context 'otherwise' do
let(:key) { private_key }
its(:alg) { should == :RS256 }
end
end
context 'when non-JWK key is given' do
let(:key) { private_key }
it 'should not set kid header automatically' do
jws = jwt.sign(key, :RS256)
jws.kid.should be_blank
end
end
context 'when JWK is given' do
let(:key) { JSON::JWK.new private_key }
it 'should set kid header automatically' do
jws = jwt.sign(key, :RS256)
jwt.kid.should be_blank
jws.kid.should == key[:kid]
end
end
end
describe '#encrypt' do
let(:shared_key) { SecureRandom.hex 16 } # default shared key is too short
it 'should encryptable without signing' do
jwt.encrypt(public_key).should be_a JSON::JWE
end
it 'should encryptable after signed' do
jwt.sign(shared_key).encrypt(public_key).should be_a JSON::JWE
end
it 'should accept optional algorithm' do
jwt.encrypt(shared_key, :dir).should be_a JSON::JWE
end
it 'should accept optional algorithm and encryption method' do
jwt.encrypt(SecureRandom.hex(32), :dir, :'A256CBC-HS512').should be_a JSON::JWE
end
context 'when non-JWK key is given' do
let(:key) { shared_key }
it 'should not set kid header automatically' do
jwe = jwt.encrypt(key, :dir)
jwe.kid.should be_blank
end
end
context 'when JWK is given' do
let(:key) { JSON::JWK.new shared_key }
it 'should set kid header automatically' do
jwe = jwt.encrypt(key, :dir)
jwt.kid.should be_blank
jwe.kid.should == key[:kid]
end
end
end
describe '.decode' do
context 'when not signed nor encrypted' do
context 'no signature given' do
it do
JSON::JWT.decode(no_signed).should == jwt
end
end
end
context 'when signed' do
context 'when no secret/key given' do
it 'should do verification' do
expect do
JSON::JWT.decode jws.to_s
end.to raise_error JSON::JWT::VerificationFailed
end
end
context 'when secret/key given' do
it 'should do verification' do
expect do
JSON::JWT.decode jws.to_s, 'secret'
end.to raise_error JSON::JWT::VerificationFailed
end
end
context 'when alg header malformed' do
context 'from alg=HS256' do
context 'to alg=none' do
let(:malformed_jwt_string) do
header, payload, signature = jws.to_s.split('.')
malformed_header = {alg: :none}.to_json
[
UrlSafeBase64.encode64(malformed_header),
payload,
''
].join('.')
end
it 'should do verification' do
expect do
JSON::JWT.decode malformed_jwt_string, 'secret'
end.to raise_error JSON::JWT::VerificationFailed
end
end
end
context 'from alg=RS256' do
let(:jws) do
jwt.sign private_key, :RS256
end
context 'to alg=none' do
let(:malformed_jwt_string) do
header, payload, signature = jws.to_s.split('.')
malformed_header = {alg: :none}.to_json
[
UrlSafeBase64.encode64(malformed_header),
payload,
''
].join('.')
end
it 'should fail verification' do
expect do
JSON::JWT.decode malformed_jwt_string, public_key
end.to raise_error JSON::JWT::UnexpectedAlgorithm
end
end
context 'to alg=HS256' do
let(:malformed_jwt_string) do
header, payload, signature = jws.to_s.split('.')
malformed_header = {alg: :HS256}.to_json
malformed_signature = OpenSSL::HMAC.digest(
OpenSSL::Digest.new('SHA256'),
public_key.to_s,
[malformed_header, payload].join('.')
)
[
UrlSafeBase64.encode64(malformed_header),
payload,
UrlSafeBase64.encode64(malformed_signature)
].join('.')
end
it 'should fail verification' do
expect do
JSON::JWT.decode malformed_jwt_string, public_key
end.to raise_error JSON::JWS::UnexpectedAlgorithm
end
end
end
end
context 'when :skip_verification given as secret/key' do
it 'should skip verification' do
expect do
jwt = JSON::JWT.decode jws.to_s, :skip_verification
jwt.header.should == {'alg' => 'HS256', 'typ' => 'JWT'}
end.not_to raise_error
end
end
context 'when JSON Serialization given' do
let(:signed) { JSON::JWT.new(claims).sign('secret') }
shared_examples_for :json_serialization_parser do
context 'when proper secret given' do
it { JSON::JWT.decode(serialized, 'secret').should == signed }
end
context 'when verification skipped' do
it { JSON::JWT.decode(serialized, :skip_verification).should == signed }
end
context 'when wrong secret given' do
it do
expect do
JSON::JWT.decode serialized, 'wrong'
end.to raise_error JSON::JWT::VerificationFailed
end
end
end
context 'when general' do
let(:serialized) do
{
payload: UrlSafeBase64.encode64(claims.to_json),
signatures: [{
protected: UrlSafeBase64.encode64(signed.header.to_json),
signature: UrlSafeBase64.encode64(signed.signature)
}]
}
end
it_behaves_like :json_serialization_parser
end
context 'when flattened' do
let(:serialized) do
{
protected: UrlSafeBase64.encode64(signed.header.to_json),
payload: UrlSafeBase64.encode64(claims.to_json),
signature: UrlSafeBase64.encode64(signed.signature)
}
end
it_behaves_like :json_serialization_parser
end
end
end
context 'when encrypted' do
let(:input) { jwt.encrypt(public_key).to_s }
let(:shared_key) { SecureRandom.hex 16 } # default shared key is too short
it 'should decryptable' do
JSON::JWT.decode(input, private_key).should be_instance_of JSON::JWE
end
context 'when :skip_decryption given as secret/key' do
it 'should skip verification' do
expect do
jwe = JSON::JWT.decode input, :skip_decryption
jwe.should be_instance_of JSON::JWE
jwe.header.should == {'alg' => 'RSA1_5', 'enc' => 'A128CBC-HS256'}
end.not_to raise_error
end
end
end
context 'when JSON parse failed' do
it do
expect do
JSON::JWT.decode('header.payload.signature')
end.to raise_error JSON::JWT::InvalidFormat
end
end
context 'when unexpected format' do
context 'when too few dots' do
it do
expect do
JSON::JWT.decode 'header'
end.to raise_error JSON::JWT::InvalidFormat
end
end
context 'when too many dots' do
it do
expect do
JSON::JWT.decode 'header.payload.signature.something.wrong'
end.to raise_error JSON::JWT::InvalidFormat
end
end
end
end
end
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