feat: Add APIs for linear integration (#9346)

app/controllers/api/v1/accounts/integrations/linear_controller.rb

@@ -0,0 +1,93 @@
+class Api::V1::Accounts::Integrations::LinearController < Api::V1::Accounts::BaseController
+  before_action :fetch_conversation, only: [:link_issue, :linked_issues]
+
+  def teams
+    teams = linear_processor_service.teams
+    if teams[:error]
+      render json: { error: teams[:error] }, status: :unprocessable_entity
+    else
+      render json: teams[:data], status: :ok
+    end
+  end
+
+  def team_entities
+    team_id = permitted_params[:team_id]
+    team_entities = linear_processor_service.team_entities(team_id)
+    if team_entities[:error]
+      render json: { error: team_entities[:error] }, status: :unprocessable_entity
+    else
+      render json: team_entities[:data], status: :ok
+    end
+  end
+
+  def create_issue
+    issue = linear_processor_service.create_issue(permitted_params)
+    if issue[:error]
+      render json: { error: issue[:error] }, status: :unprocessable_entity
+    else
+      render json: issue[:data], status: :ok
+    end
+  end
+
+  def link_issue
+    issue_id = permitted_params[:issue_id]
+    title = permitted_params[:title]
+    issue = linear_processor_service.link_issue(conversation_link, issue_id, title)
+    if issue[:error]
+      render json: { error: issue[:error] }, status: :unprocessable_entity
+    else
+      render json: issue[:data], status: :ok
+    end
+  end
+
+  def unlink_issue
+    link_id = permitted_params[:link_id]
+    issue = linear_processor_service.unlink_issue(link_id)
+
+    if issue[:error]
+      render json: { error: issue[:error] }, status: :unprocessable_entity
+    else
+      render json: issue[:data], status: :ok
+    end
+  end
+
+  def linked_issues
+    issues = linear_processor_service.linked_issues(conversation_link)
+
+    if issues[:error]
+      render json: { error: issues[:error] }, status: :unprocessable_entity
+    else
+      render json: issues[:data], status: :ok
+    end
+  end
+
+  def search_issue
+    render json: { error: 'Specify search string with parameter q' }, status: :unprocessable_entity if params[:q].blank? && return
+
+    term = params[:q]
+    issues = linear_processor_service.search_issue(term)
+    if issues[:error]
+      render json: { error: issues[:error] }, status: :unprocessable_entity
+    else
+      render json: issues[:data], status: :ok
+    end
+  end
+
+  private
+
+  def conversation_link
+    "#{ENV.fetch('FRONTEND_URL', nil)}/app/accounts/#{Current.account.id}/conversations/#{@conversation.display_id}"
+  end
+
+  def fetch_conversation
+    @conversation = Current.account.conversations.find_by!(display_id: permitted_params[:conversation_id])
+  end
+
+  def linear_processor_service
+    Integrations::Linear::ProcessorService.new(account: Current.account)
+  end
+
+  def permitted_params
+    params.permit(:team_id, :conversation_id, :issue_id, :link_id, :title, :description, :assignee_id, :priority, label_ids: [])
+  end
+end