feat: add linked issue api

lib/integrations/linear/processor_service.rb

@@ -58,6 +58,13 @@ class Integrations::Linear::ProcessorService
     response['searchIssues']['nodes'].map(&:as_json)
   end
 
+  def linked_issue(url)
+    response = linear_client.linked_issue(url)
+    return response if response[:error]
+
+    response['attachmentsForURL']['nodes'].map(&:as_json)
+  end
+
   private
 
   def linear_hook

lib/linear.rb

@@ -35,6 +35,12 @@ class Linear
     execute_query(LinearQueries.search_issue(term))
   end
 
+  def linked_issue(url)
+    raise ArgumentError, 'Missing link' if url.blank?
+
+    execute_query(LinearQueries.linked_issue(url))
+  end
+
   def create_issue(params)
     validate_team_and_title(params)
     validate_priority(params[:priority])

lib/linear_queries.rb

@@ -58,4 +58,22 @@ module LinearQueries
       }
     GRAPHQL
   end
+
+  def self.linked_issue(url)
+    <<~GRAPHQL
+      query {
+        attachmentsForURL(url: "#{url}") {
+          nodes {
+            id
+            title
+            issue {
+              id
+              title
+              description
+            }
+          }
+        }
+      }
+    GRAPHQL
+  end
 end