gpg signature model for gpg verification caching

app/models/gpg_signature.rb

+class GpgSignature < ActiveRecord::Base
+  belongs_to :project
+  belongs_to :gpg_key
+
+  validates :commit_sha, presence: true
+  validates :project, presence: true
+end

db/migrate/20170613154149_create_gpg_signatures.rb

+class CreateGpgSignatures < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    create_table :gpg_signatures do |t|
+      t.string :commit_sha
+      t.references :project, index: true, foreign_key: true
+      t.references :gpg_key, index: true, foreign_key: true
+      t.string :gpg_key_primary_keyid
+      t.boolean :valid_signature
+
+      t.timestamps_with_timezone null: false
+    end
+
+    add_concurrent_index :gpg_signatures, :commit_sha
+    add_concurrent_index :gpg_signatures, :gpg_key_primary_keyid
+  end
+
+  def down
+    remove_concurrent_index :gpg_signatures, :commit_sha if index_exists?(:gpg_signatures, :commit_sha)
+    remove_concurrent_index :gpg_signatures, :gpg_key_primary_keyid if index_exists?(:gpg_signatures, :gpg_key_primary_keyid)
+
+    drop_table :gpg_signatures
+  end
+end

db/schema.rb

@@ -552,6 +552,21 @@ ActiveRecord::Schema.define(version: 20170725145659) do
   add_index "gpg_keys", ["primary_keyid"], name: "index_gpg_keys_on_primary_keyid", using: :btree
   add_index "gpg_keys", ["user_id"], name: "index_gpg_keys_on_user_id", using: :btree
 
+  create_table "gpg_signatures", force: :cascade do |t|
+    t.string "commit_sha"
+    t.integer "project_id"
+    t.integer "gpg_key_id"
+    t.string "gpg_key_primary_keyid"
+    t.boolean "valid_signature"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "gpg_signatures", ["commit_sha"], name: "index_gpg_signatures_on_commit_sha", using: :btree
+  add_index "gpg_signatures", ["gpg_key_id"], name: "index_gpg_signatures_on_gpg_key_id", using: :btree
+  add_index "gpg_signatures", ["gpg_key_primary_keyid"], name: "index_gpg_signatures_on_gpg_key_primary_keyid", using: :btree
+  add_index "gpg_signatures", ["project_id"], name: "index_gpg_signatures_on_project_id", using: :btree
+
   create_table "identities", force: :cascade do |t|
     t.string "extern_uid"
     t.string "provider"
@@ -1615,6 +1630,8 @@ ActiveRecord::Schema.define(version: 20170725145659) do
   add_foreign_key "events", "projects", name: "fk_0434b48643", on_delete: :cascade
   add_foreign_key "forked_project_links", "projects", column: "forked_to_project_id", name: "fk_434510edb0", on_delete: :cascade
   add_foreign_key "gpg_keys", "users"
+  add_foreign_key "gpg_signatures", "gpg_keys"
+  add_foreign_key "gpg_signatures", "projects"
   add_foreign_key "issue_assignees", "issues", name: "fk_b7d881734a", on_delete: :cascade
   add_foreign_key "issue_assignees", "users", name: "fk_5e0c8d9154", on_delete: :cascade
   add_foreign_key "issue_metrics", "issues", on_delete: :cascade

spec/models/gpg_signature_spec.rb

+require 'rails_helper'
+
+RSpec.describe GpgSignature do
+  describe 'associations' do
+    it { is_expected.to belong_to(:project) }
+    it { is_expected.to belong_to(:gpg_key) }
+  end
+
+  describe 'validation' do
+    subject { described_class.new }
+    it { is_expected.to validate_presence_of(:commit_sha) }
+    it { is_expected.to validate_presence_of(:project) }
+  end
+end