Add custom mapping related columns

Add `payload_example` and `payload_attribute_mapping` columns to
`alert_management_http_integration`

app/models/alert_management/http_integration.rb

@@ -22,6 +22,7 @@ module AlertManagement
     validates :name, presence: true, length: { maximum: 255 }
     validates :endpoint_identifier, presence: true, length: { maximum: 255 }, format: { with: /\A[A-Za-z0-9]+\z/ }
     validates :endpoint_identifier, uniqueness: { scope: [:project_id, :active] }, if: :active?
+    validates :payload_attribute_mapping, json_schema: { filename: 'http_integration_payload_attribute_mapping' }
 
     before_validation :prevent_token_assignment
     before_validation :prevent_endpoint_identifier_assignment

app/validators/json_schemas/http_integration_payload_attribute_mapping.json

+{
+  "type": "object",
+  "patternProperties": {
+    ".*": {
+      "type": "object",
+      "required": ["path", "type"],
+      "properties": {
+        "path": { "type": "array" },
+        "type": { "type": "string" }
+      },
+      "additionalProperties": false
+    }
+  }
+}

changelogs/unreleased/ck3g-add-custom-mapping-columns-to-http-integrations.yml

+---
+title: Add payload_example and payload_attribute_mapping columns to alert_management_http_integrations
+  table
+merge_request: 49941
+author:
+type: added

db/migrate/20201214113729_add_custom_mapping_columns_to_http_integrations.rb

+# frozen_string_literal: true
+
+class AddCustomMappingColumnsToHttpIntegrations < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    add_column :alert_management_http_integrations, :payload_example, :jsonb, null: false, default: {}
+    add_column :alert_management_http_integrations, :payload_attribute_mapping, :jsonb, null: false, default: {}
+  end
+end

db/schema_migrations/20201214113729

+9c2f6c75126172d4876db33cfd814f974a381df97a23aec21f2550ec288946c2
\ No newline at end of file

db/structure.sql

@@ -8837,6 +8837,8 @@ CREATE TABLE alert_management_http_integrations (
     encrypted_token_iv text NOT NULL,
     endpoint_identifier text NOT NULL,
     name text NOT NULL,
+    payload_example jsonb DEFAULT '{}'::jsonb NOT NULL,
+    payload_attribute_mapping jsonb DEFAULT '{}'::jsonb NOT NULL,
     CONSTRAINT check_286943b636 CHECK ((char_length(encrypted_token_iv) <= 255)),
     CONSTRAINT check_392143ccf4 CHECK ((char_length(name) <= 255)),
     CONSTRAINT check_e270820180 CHECK ((char_length(endpoint_identifier) <= 255)),

spec/models/alert_management/http_integration_spec.rb

@@ -31,6 +31,54 @@ RSpec.describe AlertManagement::HttpIntegration do
 
       it { is_expected.not_to validate_uniqueness_of(:endpoint_identifier).scoped_to(:project_id, :active) }
     end
+
+    context 'payload_attribute_mapping' do
+      subject { build(:alert_management_http_integration, payload_attribute_mapping: attribute_mapping) }
+
+      context 'with valid JSON schema' do
+        let(:attribute_mapping) do
+          {
+            title: { path: %w(a b c), type: 'string' },
+            description: { path: %w(a), type: 'string' }
+          }
+        end
+
+        it { is_expected.to be_valid }
+      end
+
+      context 'with invalid JSON schema' do
+        shared_examples 'is invalid record' do
+          it do
+            expect(subject).to be_invalid
+            expect(subject.errors.messages[:payload_attribute_mapping]).to eq(['must be a valid json schema'])
+          end
+        end
+
+        context 'when property is not an object' do
+          let(:attribute_mapping) do
+            { title: 'That is not a valid schema' }
+          end
+
+          it_behaves_like 'is invalid record'
+        end
+
+        context 'when property missing required attributes' do
+          let(:attribute_mapping) do
+            { title: { type: 'string' } }
+          end
+
+          it_behaves_like 'is invalid record'
+        end
+
+        context 'when property has extra attributes' do
+          let(:attribute_mapping) do
+            { title: { path: %w(a b c), type: 'string', extra: 'property' } }
+          end
+
+          it_behaves_like 'is invalid record'
+        end
+      end
+    end
   end
 
   describe '#token' do