From b08c61512cfd019e0087a0f1df13d9b0ed51eaf8 Mon Sep 17 00:00:00 2001
From: Alex Nizamov <nizamov.alex@gmail.com>
Date: Tue, 1 Oct 2024 20:13:26 +0500
Subject: [PATCH] Allow to fetch envelopes by their resources' IDs

---
 app/api/v1/envelopes.rb             |  6 ++++-
 spec/api/v1/single_envelope_spec.rb | 38 +++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/app/api/v1/envelopes.rb b/app/api/v1/envelopes.rb
index 9e662312..764c2559 100644
--- a/app/api/v1/envelopes.rb
+++ b/app/api/v1/envelopes.rb
@@ -130,7 +130,11 @@ def find_community_envelopes
               id = params[:envelope_id]&.downcase
 
               @envelope = find_envelopes.find_by(envelope_id: id) ||
-                find_envelopes.where(envelope_ceterms_ctid: id).last
+                find_envelopes.where(envelope_ceterms_ctid: id).last ||
+                find_envelopes
+                  .joins(:envelope_resources)
+                  .where(envelope_resources: { resource_id: id })
+                  .last
 
               if @envelope.nil?
                 error!({ errors: ['Couldn\'t find Envelope'] }, 404)
diff --git a/spec/api/v1/single_envelope_spec.rb b/spec/api/v1/single_envelope_spec.rb
index 4004dd64..c5aa4e45 100644
--- a/spec/api/v1/single_envelope_spec.rb
+++ b/spec/api/v1/single_envelope_spec.rb
@@ -80,6 +80,44 @@
         )
       end
     end
+
+    context 'by resource ID' do
+      let(:resource) { create(:envelope_resource, envelope: subject) }
+      let(:resource_id) { resource.resource_id }
+
+      include_examples 'missing envelope', :get
+
+      subject { envelopes.first }
+
+      before(:each) do
+        with_versioned_envelope(subject) do
+          get "/learning-registry/envelopes/#{resource_id}"
+        end
+      end
+
+      it { expect_status(:ok) }
+
+      it 'retrieves the desired envelope' do
+        expect_json(envelope_community: subject.envelope_community.name)
+        expect_json(envelope_id: subject.envelope_id)
+        expect_json(resource_format: 'json')
+        expect_json(resource_encoding: 'jwt')
+      end
+
+      it 'displays the appended node headers' do
+        base_url = "/learning-registry/envelopes/#{subject.envelope_id}"
+
+        expect_json_keys('node_headers', %i[resource_digest revision_history
+                                            created_at updated_at deleted_at])
+        expect_json('node_headers.revision_history.1', head: true)
+        expect_json('node_headers.revision_history.1', url: base_url)
+        expect_json('node_headers.revision_history.0', head: false)
+        expect_json(
+          'node_headers.revision_history.0',
+          url: "#{base_url}/revisions/#{subject.versions.last.id}"
+        )
+      end
+    end
   end
 
   context 'PATCH /:community/envelopes/:id' do