HTTP signatures (#4146)

* Add Request class with HTTP signature generator

Spec: https://tools.ietf.org/html/draft-cavage-http-signatures-06

* Add HTTP signature verification concern

* Add test for SignatureVerification concern

* Add basic test for Request class

* Make PuSH subscribe/unsubscribe requests use new Request class

Accidentally fix lease_seconds not being set and sent properly, and
change the new minimum subscription duration to 1 day

* Make all PuSH workers use new Request class

* Make Salmon sender use new Request class

* Make FetchLinkService use new Request class

* Make FetchAtomService use the new Request class

* Make Remotable use the new Request class

* Make ResolveRemoteAccountService use the new Request class

* Add more tests

* Allow +-30 seconds window for signed request to remain valid

* Disable time window validation for signed requests, restore 7 days
as PuSH subscription duration (which was previous default due to a bug)

1 files changed, 54 insertions, 0 deletions

diff --git a/spec/lib/request_spec.rb b/spec/lib/request_spec.rb
new file mode 100644
index 000000000..782f14b18
--- /dev/null
+++ b/spec/lib/request_spec.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Request do
+  subject { Request.new(:get, 'http://example.com') }
+
+  describe '#headers' do
+    it 'returns user agent' do
+      expect(subject.headers['User-Agent']).to be_present
+    end
+
+    it 'returns the date header' do
+      expect(subject.headers['Date']).to be_present
+    end
+
+    it 'returns the host header' do
+      expect(subject.headers['Host']).to be_present
+    end
+
+    it 'does not return virtual request-target header' do
+      expect(subject.headers['(request-target)']).to be_nil
+    end
+  end
+
+  describe '#on_behalf_of' do
+    it 'when used, adds signature header' do
+      subject.on_behalf_of(Fabricate(:account))
+      expect(subject.headers['Signature']).to be_present
+    end
+  end
+
+  describe '#add_headers' do
+    it 'adds headers to the request' do
+      subject.add_headers('Test' => 'Foo')
+      expect(subject.headers['Test']).to eq 'Foo'
+    end
+  end
+
+  describe '#perform' do
+    before do
+      stub_request(:get, 'http://example.com')
+      subject.perform
+    end
+
+    it 'executes a HTTP request' do
+      expect(a_request(:get, 'http://example.com')).to have_been_made.once
+    end
+
+    it 'sets headers' do
+      expect(a_request(:get, 'http://example.com').with(headers: subject.headers)).to have_been_made
+    end
+  end
+end