122 lines
3.5 KiB
Ruby
122 lines
3.5 KiB
Ruby
# frozen_string_literal: true
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require 'rails_helper'
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RSpec.describe ActivityPub::LinkedDataSignature do
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include JsonLdHelper
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subject { described_class.new(json) }
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let!(:sender) { Fabricate(:account, uri: 'http://example.com/alice', domain: 'example.com') }
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let(:raw_json) do
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{
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'@context' => 'https://www.w3.org/ns/activitystreams',
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'id' => 'http://example.com/hello-world',
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}
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end
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let(:json) { raw_json.merge('signature' => signature) }
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before do
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stub_jsonld_contexts!
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end
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describe '#verify_actor!' do
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context 'when signature matches' do
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let(:raw_signature) do
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{
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'creator' => 'http://example.com/alice',
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'created' => '2017-09-23T20:21:34Z',
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}
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end
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let(:signature) { raw_signature.merge('type' => 'RsaSignature2017', 'signatureValue' => sign(sender, raw_signature, raw_json)) }
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it 'returns creator' do
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expect(subject.verify_actor!).to eq sender
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end
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end
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context 'when local account record is missing a public key' do
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let(:raw_signature) do
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{
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'creator' => 'http://example.com/alice',
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'created' => '2017-09-23T20:21:34Z',
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}
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end
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let(:signature) { raw_signature.merge('type' => 'RsaSignature2017', 'signatureValue' => sign(sender, raw_signature, raw_json)) }
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let(:service_stub) { instance_double(ActivityPub::FetchRemoteKeyService) }
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before do
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# Ensure signature is computed with the old key
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signature
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# Unset key
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old_key = sender.public_key
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sender.update!(private_key: '', public_key: '')
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allow(ActivityPub::FetchRemoteKeyService).to receive(:new).and_return(service_stub)
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allow(service_stub).to receive(:call).with('http://example.com/alice') do
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sender.update!(public_key: old_key)
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sender
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end
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end
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it 'fetches key and returns creator' do
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expect(subject.verify_actor!).to eq sender
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expect(service_stub).to have_received(:call).with('http://example.com/alice').once
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end
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end
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context 'when signature is missing' do
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let(:signature) { nil }
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it 'returns nil' do
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expect(subject.verify_actor!).to be_nil
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end
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end
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context 'when signature is tampered' do
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let(:raw_signature) do
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{
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'creator' => 'http://example.com/alice',
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'created' => '2017-09-23T20:21:34Z',
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}
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end
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let(:signature) { raw_signature.merge('type' => 'RsaSignature2017', 'signatureValue' => 's69F3mfddd99dGjmvjdjjs81e12jn121Gkm1') }
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it 'returns nil' do
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expect(subject.verify_actor!).to be_nil
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end
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end
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end
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describe '#sign!' do
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subject { described_class.new(raw_json).sign!(sender) }
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it 'returns a hash' do
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expect(subject).to be_a Hash
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end
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it 'contains signature' do
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expect(subject['signature']).to be_a Hash
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expect(subject['signature']['signatureValue']).to be_present
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end
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it 'can be verified again' do
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expect(described_class.new(subject).verify_actor!).to eq sender
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end
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end
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def sign(from_actor, options, document)
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options_hash = Digest::SHA256.hexdigest(canonicalize(options.merge('@context' => ActivityPub::LinkedDataSignature::CONTEXT)))
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document_hash = Digest::SHA256.hexdigest(canonicalize(document))
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to_be_verified = options_hash + document_hash
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Base64.strict_encode64(from_actor.keypair.sign(OpenSSL::Digest.new('SHA256'), to_be_verified))
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end
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end
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