Add Keybase integration (#10297)

* create account_identity_proofs table

* add endpoint for keybase to check local proofs

* add async task to update validity and liveness of proofs from keybase

* first pass keybase proof CRUD

* second pass keybase proof creation

* clean up proof list and add badges

* add avatar url to keybase api

* Always highlight the “Identity Proofs” navigation item when interacting with proofs.

* Update translations.

* Add profile URL.

* Reorder proofs.

* Add proofs to bio.

* Update settings/identity_proofs front-end.

* Use `link_to`.

* Only encode query params if they exist.

URLs without params had a trailing `?`.

* Only show live proofs.

* change valid to active in proof list and update liveness before displaying

* minor fixes

* add keybase config at well-known path

* extremely naive feature flagging off the identity proof UI

* fixes for rubocop

* make identity proofs page resilient to potential keybase issues

* normalize i18n

* tweaks for brakeman

* remove two unused translations

* cleanup and add more localizations

* make keybase_contacts an admin setting

* fix ExternalProofService my_domain

* use Addressable::URI in identity proofs

* use active model serializer for keybase proof config

* more cleanup of keybase proof config

* rename proof is_valid and is_live to proof_valid and proof_live

* cleanup

* assorted tweaks for more robust communication with keybase

* Clean up

* Small fixes

* Display verified identity identically to verified links

* Clean up unused CSS

* Add caching for Keybase avatar URLs

* Remove keybase_contacts setting

spec/lib/proof_provider/keybase/verifier_spec.rb

@@ -0,0 +1,82 @@
+require 'rails_helper'
+
+describe ProofProvider::Keybase::Verifier do
+  let(:my_domain) { Rails.configuration.x.local_domain }
+
+  let(:keybase_proof) do
+    local_proof = AccountIdentityProof.new(
+      provider: 'Keybase',
+      provider_username: 'cryptoalice',
+      token: '11111111111111111111111111'
+    )
+
+    described_class.new('alice', 'cryptoalice', '11111111111111111111111111')
+  end
+
+  let(:query_params) do
+    "domain=#{my_domain}&kb_username=cryptoalice&sig_hash=11111111111111111111111111&username=alice"
+  end
+
+  describe '#valid?' do
+    let(:base_url) { 'https://keybase.io/_/api/1.0/sig/proof_valid.json' }
+
+    context 'when valid' do
+      before do
+        json_response_body = '{"status":{"code":0,"name":"OK"},"proof_valid":true}'
+        stub_request(:get, "#{base_url}?#{query_params}").to_return(status: 200, body: json_response_body)
+      end
+
+      it 'calls out to keybase and returns true' do
+        expect(keybase_proof.valid?).to eq true
+      end
+    end
+
+    context 'when invalid' do
+      before do
+        json_response_body = '{"status":{"code":0,"name":"OK"},"proof_valid":false}'
+        stub_request(:get, "#{base_url}?#{query_params}").to_return(status: 200, body: json_response_body)
+      end
+
+      it 'calls out to keybase and returns false' do
+        expect(keybase_proof.valid?).to eq false
+      end
+    end
+
+    context 'with an unexpected api response' do
+      before do
+        json_response_body = '{"status":{"code":100,"desc":"wrong size hex_id","fields":{"sig_hash":"wrong size hex_id"},"name":"INPUT_ERROR"}}'
+        stub_request(:get, "#{base_url}?#{query_params}").to_return(status: 200, body: json_response_body)
+      end
+
+      it 'swallows the error and returns false' do
+        expect(keybase_proof.valid?).to eq false
+      end
+    end
+  end
+
+  describe '#status' do
+    let(:base_url) { 'https://keybase.io/_/api/1.0/sig/proof_live.json' }
+
+    context 'with a normal response' do
+      before do
+        json_response_body = '{"status":{"code":0,"name":"OK"},"proof_live":false,"proof_valid":true}'
+        stub_request(:get, "#{base_url}?#{query_params}").to_return(status: 200, body: json_response_body)
+      end
+
+      it 'calls out to keybase and returns the status fields as proof_valid and proof_live' do
+        expect(keybase_proof.status).to include({ 'proof_valid' => true, 'proof_live' => false })
+      end
+    end
+
+    context 'with an unexpected keybase response' do
+      before do
+        json_response_body = '{"status":{"code":100,"desc":"missing non-optional field sig_hash","fields":{"sig_hash":"missing non-optional field sig_hash"},"name":"INPUT_ERROR"}}'
+        stub_request(:get, "#{base_url}?#{query_params}").to_return(status: 200, body: json_response_body)
+      end
+
+      it 'raises a ProofProvider::Keybase::UnexpectedResponseError' do
+        expect { keybase_proof.status }.to raise_error ProofProvider::Keybase::UnexpectedResponseError
+      end
+    end
+  end
+end