Refactor global entry

Add freeze and validation

app/controllers/projects/web_ide_schemas_controller.rb

+# frozen_string_literal: true
+
+class Projects::WebIdeSchemasController < Projects::ApplicationController
+  before_action :authenticate_user!
+
+  def show
+    return respond_422 unless branch_sha
+
+    result = ::Ide::SchemasConfigService.new(project, current_user, sha: branch_sha, filename: params[:filename]).execute
+
+    if result[:status] == :success
+      render json: result[:schema]
+    else
+      render json: result, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+  def branch_sha
+    return unless params[:branch].present?
+
+    project.commit(params[:branch])&.id
+  end
+end

app/controllers/projects/web_ide_terminals_controller.rb

@@ -11,7 +11,7 @@ class Projects::WebIdeTerminalsController < Projects::ApplicationController
   def check_config
     return respond_422 unless branch_sha
 
-    result = ::Ci::WebIdeConfigService.new(project, current_user, sha: branch_sha).execute
+    result = ::Ide::TerminalConfigService.new(project, current_user, sha: branch_sha).execute
 
     if result[:status] == :success
       head :ok

app/services/ci/create_web_ide_terminal_service.rb

@@ -70,7 +70,7 @@ module Ci
     end
 
     def load_terminal_config!
-      result = ::Ci::WebIdeConfigService.new(project, current_user, sha: sha).execute
+      result = ::Ide::TerminalConfigService.new(project, current_user, sha: sha).execute
       raise TerminalCreationError, result[:message] if result[:status] != :success
 
       @terminal = result[:terminal]

app/services/ci/web_ide_config_service.rb → app/services/ide/base_config_service.rb

 # frozen_string_literal: true
 
-module Ci
-  class WebIdeConfigService < ::BaseService
-    include ::Gitlab::Utils::StrongMemoize
-
+module Ide
+  class BaseConfigService < ::BaseService
     ValidationError = Class.new(StandardError)
 
     WEBIDE_CONFIG_FILE = '.gitlab/.gitlab-webide.yml'.freeze
@@ -11,15 +9,21 @@ module Ci
     attr_reader :config, :config_content
 
     def execute
-      check_access!
-      load_config_content!
-      load_config!
+      check_access_and_load_config!
 
-      success(terminal: config.terminal_value)
+      success
     rescue ValidationError => e
       error(e.message)
     end
 
+    protected
+
+    def check_access_and_load_config!
+      check_access!
+      load_config_content!
+      load_config!
+    end
+
     private
 
     def check_access!

app/services/ide/schemas_config_service.rb

+# frozen_string_literal: true
+
+module Ide
+  class SchemasConfigService < ::Ide::BaseConfigService
+    PREDEFINED_SCHEMAS = [{
+      uri: 'https://json.schemastore.org/gitlab-ci',
+      match: ['*.gitlab-ci.yml']
+    }].freeze
+
+    def execute
+      schema = predefined_schema_for(params[:filename]) || {}
+      success(schema: schema)
+    rescue => e
+      error(e.message)
+    end
+
+    private
+
+    def find_schema(filename, schemas)
+      match_flags = ::File::FNM_DOTMATCH | ::File::FNM_PATHNAME
+
+      schemas.each do |schema|
+        match = schema[:match].any? { |pattern| ::File.fnmatch?(pattern, filename, match_flags) }
+
+        return Gitlab::Json.parse(get_cached(schema[:uri])) if match
+      end
+
+      nil
+    end
+
+    def predefined_schema_for(filename)
+      find_schema(filename, predefined_schemas)
+    end
+
+    def predefined_schemas
+      return PREDEFINED_SCHEMAS if Feature.enabled?(:schema_linting)
+
+      []
+    end
+
+    def get_cached(url)
+      Rails.cache.fetch("services:ide:schema:#{url}", expires_in: 1.day) do
+        Gitlab::HTTP.get(url).body
+      end
+    end
+  end
+end
+
+Ide::SchemasConfigService.prepend_if_ee('::EE::Ide::SchemasConfigService')

app/services/ide/terminal_config_service.rb

+# frozen_string_literal: true
+
+module Ide
+  class TerminalConfigService < ::Ide::BaseConfigService
+    private
+
+    def success(pass_back = {})
+      result = super(pass_back)
+      result[:terminal] = config.terminal_value
+      result
+    end
+  end
+end

config/routes/project.rb

@@ -378,6 +378,11 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
           post :reset_token
         end
         resources :feature_flags_user_lists, param: :iid, only: [:new, :edit, :show]
+
+        get '/schema/:branch/*filename',
+          to: 'web_ide_schemas#show',
+          format: false,
+          as: :schema
       end
       # End of the /-/ scope.
 

ee/app/models/license.rb

@@ -85,6 +85,7 @@ class License < ApplicationRecord
     group_project_templates
     group_repository_analytics
     group_saml
+    ide_schema_config
     issues_analytics
     jira_issues_integration
     ldap_group_sync_filter

ee/app/services/ee/ide/schemas_config_service.rb

+# frozen_string_literal: true
+
+module EE
+  module Ide
+    module SchemasConfigService
+      extend ::Gitlab::Utils::Override
+
+      override :execute
+      def execute
+        result = super
+        return result if result[:status] == :success && !result[:schema].empty?
+
+        check_access_and_load_config!
+        success(schema: schema_from_config_for(params[:filename]) || {})
+      rescue => e
+        error(e.message)
+      end
+
+      private
+
+      def schema_from_config_for(filename)
+        return {} unless project.feature_available?(:ide_schema_config)
+
+        find_schema(filename, config.schemas_value || [])
+      end
+    end
+  end
+end

ee/lib/ee/gitlab/web_ide/config/entry/global.rb

+# frozen_string_literal: true
+
+module EE
+  module Gitlab
+    module WebIde
+      module Config
+        module Entry
+          module Global
+            extend ActiveSupport::Concern
+
+            class_methods do
+              def allowed_keys
+                %i[terminal schemas].freeze
+              end
+            end
+
+            prepended do
+              entry :schemas, ::Gitlab::WebIde::Config::Entry::Schemas,
+                description: 'Configuration of JSON/YAML schemas.'
+            end
+          end
+        end
+      end
+    end
+  end
+end

ee/lib/gitlab/web_ide/config/entry/schema.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module WebIde
+    class Config
+      module Entry
+        ##
+        # Entry that represents a JSON/YAML schema.
+        #
+        class Schema < ::Gitlab::Config::Entry::Node
+          include ::Gitlab::Config::Entry::Configurable
+          include ::Gitlab::Config::Entry::Attributable
+
+          ALLOWED_KEYS = %i[uri match].freeze
+
+          validations do
+            validates :config, allowed_keys: ALLOWED_KEYS
+          end
+
+          entry :uri, Entry::Schema::Uri,
+            description: 'The URI of the schema.'
+
+          entry :match, Entry::Schema::Match,
+            description: 'A list of glob expressions to match against the target file.'
+
+          def value
+            to_hash.compact
+          end
+
+          private
+
+          def to_hash
+            { uri: uri_value,
+              match: match_value || [] }
+          end
+        end
+      end
+    end
+  end
+end

ee/lib/gitlab/web_ide/config/entry/schema/match.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module WebIde
+    class Config
+      module Entry
+        class Schema
+          ##
+          # Entry that represents a list of glob expressions to match against the target file.
+          #
+          class Match < ::Gitlab::Config::Entry::Node
+            include ::Gitlab::Config::Entry::Validatable
+
+            validations do
+              validates :config, array_of_strings: true, presence: true
+            end
+
+            def self.default
+              []
+            end
+          end
+        end
+      end
+    end
+  end
+end

ee/lib/gitlab/web_ide/config/entry/schema/uri.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module WebIde
+    class Config
+      module Entry
+        class Schema
+          ##
+          # Entry that represents the URI of a schema
+          #
+          class Uri < ::Gitlab::Config::Entry::Node
+            include ::Gitlab::Config::Entry::Validatable
+
+            validations do
+              validates :config, presence: true, type: String
+            end
+
+            def self.default
+              ''
+            end
+          end
+        end
+      end
+    end
+  end
+end

ee/lib/gitlab/web_ide/config/entry/schemas.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module WebIde
+    class Config
+      module Entry
+        ##
+        # Entry that represents an array of JSON/YAML schemas
+        #
+        class Schemas < ::Gitlab::Config::Entry::Node
+          include ::Gitlab::Config::Entry::Configurable
+          include ::Gitlab::Config::Entry::Validatable
+
+          entry :schema, Entry::Schema, description: 'A JSON/YAML schema definition'
+
+          validations do
+            validates :config, type: Array
+          end
+
+          def skip_config_hash_validation?
+            true
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/lib/ee/gitlab/web_ide/config/entry/global_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::WebIde::Config::Entry::Global do
+  let(:global) { described_class.new(hash) }
+
+  describe '.nodes' do
+    context 'when filtering all the entry/node names' do
+      it 'contains the expected node names' do
+        expect(described_class.nodes.keys).to match_array(%i[terminal schemas])
+      end
+    end
+  end
+
+  context 'when configuration is valid' do
+    context 'when some entries defined' do
+      let(:hash) do
+        {
+          terminal: { before_script: ['ls'], variables: {}, script: 'sleep 10s', services: ['mysql'] },
+          schemas: [{ uri: 'https://someurl.com', match: ['*.gitlab-ci.yml'] }]
+        }
+      end
+
+      describe '#compose!' do
+        before do
+          global.compose!
+        end
+
+        it 'creates nodes hash' do
+          expect(global.descendants).to be_an Array
+        end
+
+        it 'creates node object for each entry' do
+          expect(global.descendants.count).to eq 2
+        end
+
+        it 'creates node object using valid class' do
+          expect(global.descendants.first)
+            .to be_an_instance_of Gitlab::WebIde::Config::Entry::Terminal
+          expect(global.descendants.second)
+            .to be_an_instance_of Gitlab::WebIde::Config::Entry::Schemas
+        end
+
+        it 'sets correct description for nodes' do
+          expect(global.descendants.first.description)
+            .to eq 'Configuration of the webide terminal.'
+          expect(global.descendants.second.description)
+            .to eq 'Configuration of JSON/YAML schemas.'
+        end
+      end
+
+      context 'when not composed' do
+        describe '#schemas_value' do
+          it 'returns nil' do
+            expect(global.schemas_value).to be nil
+          end
+        end
+      end
+
+      context 'when composed' do
+        before do
+          global.compose!
+        end
+
+        describe '#errors' do
+          it 'has no errors' do
+            expect(global.errors).to be_empty
+          end
+        end
+
+        describe '#schemas_value' do
+          it 'returns correct value for schemas' do
+            expect(global.schemas_value).to eq([{ uri: 'https://someurl.com', match: ['*.gitlab-ci.yml'] }])
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/lib/gitlab/web_ide/config/entry/schema/match_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::WebIde::Config::Entry::Schema::Match do
+  let(:match) { described_class.new(config) }
+
+  describe 'validations' do
+    context 'when match config value is correct' do
+      let(:config) { ['*.json'] }
+
+      describe '#value' do
+        it 'returns the match glob pattern defined' do
+          expect(match.value).to eq config
+        end
+      end
+
+      describe '#valid?' do
+        it 'is valid' do
+          expect(match).to be_valid
+        end
+      end
+    end
+
+    context 'when value has a wrong type' do
+      let(:config) { { test: true } }
+
+      it 'reports errors about wrong type' do
+        expect(match.errors)
+          .to include 'match config should be an array of strings'
+      end
+    end
+  end
+
+  describe '.default' do
+    it 'returns empty array' do
+      expect(described_class.default).to eq []
+    end
+  end
+end

ee/spec/lib/gitlab/web_ide/config/entry/schema/uri_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::WebIde::Config::Entry::Schema::Uri do
+  let(:uri) { described_class.new(config) }
+
+  describe 'validations' do
+    context 'when uri config value is correct' do
+      let(:config) { 'https://someurl.com' }
+
+      describe '#value' do
+        it 'returns the url defined' do
+          expect(uri.value).to eq config
+        end
+      end
+
+      describe '#valid?' do
+        it 'is valid' do
+          expect(uri).to be_valid
+        end
+      end
+    end
+
+    context 'when value has a wrong type' do
+      let(:config) { { test: true } }
+
+      it 'reports errors about wrong type' do
+        expect(uri.errors)
+          .to include 'uri config should be a string'
+      end
+    end
+  end
+
+  describe '.default' do
+    it 'returns empty string' do
+      expect(described_class.default).to eq ''
+    end
+  end
+end

ee/spec/lib/gitlab/web_ide/config/entry/schema_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::WebIde::Config::Entry::Schema do
+  let(:schema) { described_class.new(hash) }
+
+  describe '.nodes' do
+    it 'returns a hash' do
+      expect(described_class.nodes).to be_a(Hash)
+    end
+
+    context 'when filtering all the entry/node names' do
+      it 'contains the expected node names' do
+        expect(described_class.nodes.keys)
+          .to match_array(%i[uri match])
+      end
+    end
+  end
+
+  context 'when configuration is valid' do
+    context 'when some entries defined' do
+      let(:hash) do
+        { uri: 'https://someurl.com', match: ['*.gitlab-ci.yml'] }
+      end
+
+      describe '#compose!' do
+        before do
+          schema.compose!
+        end
+
+        it 'creates node object for each entry' do
+          expect(schema.descendants.count).to eq 2
+        end
+
+        it 'creates node object using valid class' do
+          expect(schema.descendants.first)
+            .to be_an_instance_of Gitlab::WebIde::Config::Entry::Schema::Uri
+
+          expect(schema.descendants.second)
+            .to be_an_instance_of Gitlab::WebIde::Config::Entry::Schema::Match
+        end
+
+        it 'sets correct description for nodes' do
+          expect(schema.descendants.first.description)
+            .to eq 'The URI of the schema.'
+
+          expect(schema.descendants.second.description)
+            .to eq 'A list of glob expressions to match against the target file.'
+        end
+
+        describe '#leaf?' do
+          it 'is not leaf' do
+            expect(schema).not_to be_leaf
+          end
+        end
+      end
+
+      context 'when composed' do
+        before do
+          schema.compose!
+        end
+
+        describe '#errors' do
+          it 'has no errors' do
+            expect(schema.errors).to be_empty
+          end
+        end
+
+        describe '#uri_value' do
+          it 'returns correct uri' do
+            expect(schema.uri_value).to eq('https://someurl.com')
+          end
+        end
+
+        describe '#match_value' do
+          it 'returns correct value for schemas' do
+            expect(schema.match_value).to eq(['*.gitlab-ci.yml'])
+          end
+        end
+      end
+    end
+  end
+
+  context 'when configuration is not valid' do
+    before do
+      schema.compose!
+    end
+
+    context 'when the config does not have all the required entries' do
+      let(:hash) do
+        {}
+      end
+
+      describe '#errors' do
+        it 'reports errors about the invalid entries' do
+          expect(schema.errors)
+            .to eq [
+              "uri config can't be blank",
+              "match config can't be blank"
+            ]
+        end
+      end
+    end
+
+    context 'when the config has invalid entries' do
+      let(:hash) do
+        { uri: 1, match: [2] }
+      end
+
+      describe '#errors' do
+        it 'reports errors about the invalid entries' do
+          expect(schema.errors)
+            .to eq [
+              "uri config should be a string",
+              "match config should be an array of strings"
+            ]
+        end
+      end
+    end
+  end
+
+  context 'when value is not a hash' do
+    let(:hash) { [] }
+
+    describe '#valid?' do
+      it 'is not valid' do
+        expect(schema).not_to be_valid
+      end
+    end
+
+    describe '#errors' do
+      it 'returns error about invalid type' do
+        expect(schema.errors.first).to match /should be a hash/
+      end
+    end
+  end
+
+  describe '#specified?' do
+    it 'is concrete entry that is defined' do
+      expect(schema.specified?).to be true
+    end
+  end
+end

ee/spec/lib/gitlab/web_ide/config/entry/schemas_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::WebIde::Config::Entry::Schemas do
+  let(:entry) { described_class.new(config) }
+
+  describe 'validations' do
+    before do
+      entry.compose!
+    end
+
+    context 'when entry config value is correct' do
+      let(:config) { [{ uri: 'http://test.uri', match: '*-config.yml' }] }
+
+      it 'is valid' do
+        expect(entry).to be_valid
+      end
+    end
+
+    context 'when entry config value is incorrect' do
+      let(:config) { { incorrect: 'schemas config' } }
+
+      it 'is not valid' do
+        expect(entry).not_to be_valid
+
+        expect(entry.errors.first)
+          .to match /schema/
+      end
+
+      describe '#errors' do
+        it 'reports error about a config type' do
+          expect(entry.errors)
+            .to include 'schemas config should be a array'
+        end
+      end
+    end
+  end
+
+  context 'when composed' do
+    before do
+      entry.compose!
+    end
+
+    describe '#value' do
+      context 'when entry is correct' do
+        let(:config) do
+          [
+            {
+              uri: 'http://test.uri',
+              match: '*-config.yml'
+            }
+          ]
+        end
+
+        it 'returns correct value' do
+          expect(entry.value)
+            .to eq([{
+              uri: 'http://test.uri',
+              match: '*-config.yml'
+            }])
+        end
+      end
+    end
+  end
+end

ee/spec/services/ide/schemas_config_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ide::SchemasConfigService do
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:user) { create(:user) }
+  let(:sha) { 'sha' }
+  let(:filename) { 'sample.yml' }
+  let(:schema_content) { double(body: '{"title":"Sample schema"}') }
+
+  describe '#execute' do
+    before do
+      project.add_developer(user)
+
+      allow(project.repository).to receive(:blob_data_at).with('sha', anything) do
+        config_content
+      end
+
+      allow(Gitlab::HTTP).to receive(:get).with(anything) do
+        schema_content
+      end
+    end
+
+    subject { described_class.new(project, user, sha: sha, filename: filename).execute }
+
+    context 'content is not valid' do
+      let(:config_content) { 'invalid content' }
+
+      it 'returns an error' do
+        is_expected.to include(
+          status: :error,
+          message: "Invalid configuration format")
+      end
+    end
+
+    context 'when a predefined schema exists for the given filename' do
+      let(:filename) { '.gitlab-ci.yml' }
+
+      before do
+        stub_feature_flags(schema_linting: true)
+      end
+
+      context 'with valid config content' do
+        let(:config_content) { 'schemas: [{uri: "https://someurl.com", match: ["*.yml"]}]' }
+
+        it 'uses predefined schema matches' do
+          expect(Gitlab::HTTP).to receive(:get).with('https://json.schemastore.org/gitlab-ci')
+          expect(Gitlab::HTTP).not_to receive(:get).with('https://someurl.com')
+
+          expect(subject[:schema]['title']).to eq "Sample schema"
+        end
+      end
+
+      context 'with invalid config content' do
+        let(:config_content) { '' }
+
+        it 'uses predefined schema matches' do
+          expect(Gitlab::HTTP).to receive(:get).with('https://json.schemastore.org/gitlab-ci')
+
+          expect(subject[:schema]['title']).to eq "Sample schema"
+        end
+      end
+    end
+
+    context 'no schemas are defined' do
+      let(:config_content) { '{}' }
+
+      it 'returns success with an empty object' do
+        is_expected.to include(
+          status: :success,
+          schema: {})
+      end
+    end
+
+    context 'feature :ide_schema_config is not available' do
+      let(:config_content) { 'schemas: [{uri: "https://someurl.com", match: ["*.yml"]}]' }
+
+      it 'returns empty object, despite config being defined' do
+        expect(Gitlab::HTTP).not_to receive(:get).with("https://someurl.com")
+        expect(subject[:schema]).to eq({})
+      end
+    end
+
+    context 'feature :ide_schema_config is available' do
+      before do
+        allow(project).to receive(:feature_available?).with(:ide_schema_config) { true }
+      end
+
+      context 'schemas are defined and a matching schema is found and valid' do
+        let(:config_content) { 'schemas: [{uri: "https://someurl.com", match: ["*.yml"]}]' }
+
+        it 'returns schema successfully' do
+          expect(Gitlab::HTTP).to receive(:get).with("https://someurl.com")
+          expect(subject[:schema]['title']).to eq "Sample schema"
+        end
+      end
+
+      context 'schemas are defined and a matching schema is found and but the schema is not a valid JSON' do
+        let(:config_content) { 'schemas: [{uri: "https://someurl.com", match: ["*.yml"]}]' }
+        let(:schema_content) { double(body: 'invalid json!') }
+
+        it 'returns schema successfully' do
+          expect(Gitlab::HTTP).to receive(:get).with("https://someurl.com")
+          expect(subject[:status]).to eq(:error)
+          expect(subject[:message]).to include('unexpected character () at line 1, column 1')
+        end
+      end
+
+      context 'schemas are defined and but no matching schema found' do
+        let(:config_content) { 'schemas: [{uri: "https://someurl.com", match: ["*.json"]}]' }
+
+        it 'returns empty schema object' do
+          expect(Gitlab::HTTP).not_to receive(:get).with("https://someurl.com")
+          expect(subject[:schema]).to eq({})
+        end
+      end
+
+      context 'nested schema filename with "**" in match uri' do
+        let(:config_content) { 'schemas: [{uri: "https://someurl.com", match: ["data/somepath/**/*.yml"]}]' }
+        let(:filename) { 'data/somepath/unreleased/changelog/path/changelog.yml' }
+
+        it 'returns schema successfully' do
+          expect(Gitlab::HTTP).to receive(:get).with("https://someurl.com")
+          expect(subject[:schema]['title']).to eq "Sample schema"
+        end
+      end
+    end
+  end
+end

lib/gitlab/web_ide/config.rb

@@ -34,6 +34,10 @@ module Gitlab
         @global.terminal_value
       end
 
+      def schemas_value
+        @global.schemas_value
+      end
+
       private
 
       def build_config(config, opts = {})

lib/gitlab/web_ide/config/entry/global.rb

@@ -12,18 +12,22 @@ module Gitlab
           include ::Gitlab::Config::Entry::Configurable
           include ::Gitlab::Config::Entry::Attributable
 
-          ALLOWED_KEYS = %i[terminal].freeze
+          def self.allowed_keys
+            %i[terminal].freeze
+          end
 
           validations do
-            validates :config, allowed_keys: ALLOWED_KEYS
+            validates :config, allowed_keys: Global.allowed_keys
           end
 
+          attributes allowed_keys
+
           entry :terminal, Entry::Terminal,
             description: 'Configuration of the webide terminal.'
-
-          attributes :terminal
         end
       end
     end
   end
 end
+
+::Gitlab::WebIde::Config::Entry::Global.prepend_if_ee('EE::Gitlab::WebIde::Config::Entry::Global')

spec/controllers/projects/web_ide_schemas_controller_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Projects::WebIdeSchemasController do
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:project) { create(:project, :private, :repository, namespace: developer.namespace) }
+
+  before do
+    project.add_developer(developer)
+
+    sign_in(user)
+  end
+
+  describe 'GET show' do
+    let(:user) { developer }
+    let(:branch) { 'master' }
+
+    subject do
+      get :show, params: {
+        namespace_id: project.namespace.to_param,
+        project_id: project,
+        branch: branch,
+        filename: 'package.json'
+      }
+    end
+
+    before do
+      allow_next_instance_of(::Ide::SchemasConfigService) do |instance|
+        allow(instance).to receive(:execute).and_return(result)
+      end
+    end
+
+    context 'when branch is invalid' do
+      let(:branch) { 'non-existent' }
+
+      it 'returns 422' do
+        subject
+
+        expect(response).to have_gitlab_http_status(:unprocessable_entity)
+      end
+    end
+
+    context 'when a valid schema exists' do
+      let(:result) { { status: :success, schema: { schema: 'Sample Schema' } } }
+
+      it 'returns the schema' do
+        subject
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(response.body).to eq('{"schema":"Sample Schema"}')
+      end
+    end
+
+    context 'when an error occurs parsing the schema' do
+      let(:result) { { status: :error, message: 'Some error occured' } }
+
+      it 'returns 422 with the error' do
+        subject
+
+        expect(response).to have_gitlab_http_status(:unprocessable_entity)
+        expect(response.body).to eq('{"status":"error","message":"Some error occured"}')
+      end
+    end
+  end
+end

spec/controllers/projects/web_ide_terminals_controller_spec.rb

@@ -113,7 +113,7 @@ RSpec.describe Projects::WebIdeTerminalsController do
     let(:result) { { status: :success } }
 
     before do
-      allow_next_instance_of(::Ci::WebIdeConfigService) do |instance|
+      allow_next_instance_of(::Ide::TerminalConfigService) do |instance|
         allow(instance).to receive(:execute).and_return(result)
       end
 

spec/lib/gitlab/web_ide/config/entry/global_spec.rb

@@ -12,8 +12,7 @@ RSpec.describe Gitlab::WebIde::Config::Entry::Global do
 
     context 'when filtering all the entry/node names' do
       it 'contains the expected node names' do
-        expect(described_class.nodes.keys)
-          .to match_array(%i[terminal])
+        expect(described_class.nodes.keys).to match_array(described_class.allowed_keys)
       end
     end
   end
@@ -34,7 +33,7 @@ RSpec.describe Gitlab::WebIde::Config::Entry::Global do
         end
 
         it 'creates node object for each entry' do
-          expect(global.descendants.count).to eq 1
+          expect(global.descendants.count).to eq described_class.allowed_keys.length
         end
 
         it 'creates node object using valid class' do

spec/services/ci/web_ide_config_service_spec.rb → spec/services/ide/base_config_service_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Ci::WebIdeConfigService do
+RSpec.describe Ide::BaseConfigService do
   let_it_be(:project) { create(:project, :repository) }
   let_it_be(:user) { create(:user) }
   let(:sha) { 'sha' }
@@ -47,44 +47,6 @@ RSpec.describe Ci::WebIdeConfigService do
               message: "Invalid configuration format")
           end
         end
-
-        context 'content is valid, but terminal not defined' do
-          let(:config_content) { '{}' }
-
-          it 'returns success' do
-            is_expected.to include(
-              status: :success,
-              terminal: nil)
-          end
-        end
-
-        context 'content is valid, with enabled terminal' do
-          let(:config_content) { 'terminal: {}' }
-
-          it 'returns success' do
-            is_expected.to include(
-              status: :success,
-              terminal: {
-                tag_list: [],
-                yaml_variables: [],
-                options: { script: ["sleep 60"] }
-              })
-          end
-        end
-
-        context 'content is valid, with custom terminal' do
-          let(:config_content) { 'terminal: { before_script: [ls] }' }
-
-          it 'returns success' do
-            is_expected.to include(
-              status: :success,
-              terminal: {
-                tag_list: [],
-                yaml_variables: [],
-                options: { before_script: ["ls"], script: ["sleep 60"] }
-              })
-          end
-        end
       end
     end
   end

spec/services/ide/schemas_config_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ide::SchemasConfigService do
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:user) { create(:user) }
+  let(:filename) { 'sample.yml' }
+  let(:schema_content) { double(body: '{"title":"Sample schema"}') }
+
+  describe '#execute' do
+    before do
+      project.add_developer(user)
+
+      allow(Gitlab::HTTP).to receive(:get).with(anything) do
+        schema_content
+      end
+    end
+
+    subject { described_class.new(project, user, filename: filename).execute }
+
+    context 'feature flag schema_linting is enabled', unless: Gitlab.ee? do
+      before do
+        stub_feature_flags(schema_linting: true)
+      end
+
+      context 'when no predefined schema exists for the given filename' do
+        it 'returns an empty object' do
+          is_expected.to include(
+            status: :success,
+            schema: {})
+        end
+      end
+
+      context 'when a predefined schema exists for the given filename' do
+        let(:filename) { '.gitlab-ci.yml' }
+
+        it 'uses predefined schema matches' do
+          expect(Gitlab::HTTP).to receive(:get).with('https://json.schemastore.org/gitlab-ci')
+          expect(subject[:schema]['title']).to eq "Sample schema"
+        end
+      end
+    end
+
+    context 'feature flag schema_linting is disabled', unless: Gitlab.ee? do
+      it 'returns an empty object' do
+        is_expected.to include(
+          status: :success,
+          schema: {})
+      end
+    end
+  end
+end

spec/services/ide/terminal_config_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ide::TerminalConfigService do
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:user) { create(:user) }
+  let(:sha) { 'sha' }
+
+  describe '#execute' do
+    subject { described_class.new(project, user, sha: sha).execute }
+
+    before do
+      project.add_developer(user)
+
+      allow(project.repository).to receive(:blob_data_at).with('sha', anything) do
+        config_content
+      end
+    end
+
+    context 'content is not valid' do
+      let(:config_content) { 'invalid content' }
+
+      it 'returns an error' do
+        is_expected.to include(
+          status: :error,
+          message: "Invalid configuration format")
+      end
+    end
+
+    context 'terminal not defined' do
+      let(:config_content) { '{}' }
+
+      it 'returns success' do
+        is_expected.to include(
+          status: :success,
+          terminal: nil)
+      end
+    end
+
+    context 'terminal enabled' do
+      let(:config_content) { 'terminal: {}' }
+
+      it 'returns success' do
+        is_expected.to include(
+          status: :success,
+          terminal: {
+            tag_list: [],
+            yaml_variables: [],
+            options: { script: ["sleep 60"] }
+          })
+      end
+    end
+
+    context 'custom terminal enabled' do
+      let(:config_content) { 'terminal: { before_script: [ls] }' }
+
+      it 'returns success' do
+        is_expected.to include(
+          status: :success,
+          terminal: {
+            tag_list: [],
+            yaml_variables: [],
+            options: { before_script: ["ls"], script: ["sleep 60"] }
+          })
+      end
+    end
+  end
+end