Added package_name param to packages api

Added package_name param
Updated finder to support package_name
Added tests

changelogs/unreleased/208675-add-package_name-as-option-to-packages-api.yml

+---
+title: Added package_name as filter parameter to packages API
+merge_request: 26291
+author:
+type: added

doc/api/packages.md

@@ -21,6 +21,7 @@ GET /projects/:id/packages
 | `order_by`| string | no | The field to use as order. One of `created_at` (default), `name`, `version`, or `type`. |
 | `sort`    | string | no | The direction of the order, either `asc` (default) for ascending order or `desc` for descending order. |
 | `package_type` | string | no | Filter the returned packages by type. One of `conan`, `maven`, `npm` or `nuget`. (_Introduced in GitLab 12.9_)
+| `package_name` | string | no | Filter the project packages with a fuzzy search by name. (_Introduced in GitLab 12.9_)
 
 ```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/projects/:id/packages

ee/app/finders/packages/packages_finder.rb

@@ -15,6 +15,7 @@ module Packages
     def execute
       packages = project.packages
       packages = filter_by_package_type(packages)
+      packages = filter_by_package_name(packages)
       packages = order_packages(packages)
       packages
     end
@@ -27,6 +28,12 @@ module Packages
       packages.with_package_type(params[:package_type])
     end
 
+    def filter_by_package_name(packages)
+      return packages unless params[:package_name]
+
+      packages.search_by_name(params[:package_name])
+    end
+
     def order_packages(packages)
       packages.sort_by_attribute("#{params[:order_by]}_#{params[:sort]}")
     end

ee/lib/api/project_packages.rb

@@ -26,6 +26,8 @@ module API
                         desc: 'Return packages sorted in `asc` or `desc` order.'
         optional :package_type, type: String, values: %w[conan maven npm nuget],
                         desc: 'Return packages of a certain type'
+        optional :package_name, type: String,
+                        desc: 'Return packages with this name'
       end
       get ':id/packages' do
         packages = ::Packages::PackagesFinder

ee/spec/finders/packages/packages_finder_spec.rb

@@ -65,6 +65,12 @@ describe ::Packages::PackagesFinder do
       end
     end
 
+    context 'with package_name' do
+      let(:params) { { package_name: 'maven' } }
+
+      it { is_expected.to eq([maven_package]) }
+    end
+
     context 'with nil params' do
       it { is_expected.to match_array([conan_package, maven_package]) }
     end

ee/spec/requests/api/project_packages_spec.rb

@@ -104,18 +104,28 @@ describe API::ProjectPackages do
         context 'package types' do
           %w[conan maven npm nuget].each do |package_type|
             it "returns #{package_type} packages" do
-              url = package_type_url(package_type)
+              url = package_filter_url(:type, package_type)
               get api(url, user)
 
               expect(json_response.length).to eq(1)
               expect(json_response.map { |package| package['package_type'] }).to contain_exactly(package_type)
             end
           end
+        end
+      end
+
+      context 'filtering on package_name' do
+        it 'returns the named package' do
+          url = package_filter_url(:name, 'nuget')
+          get api(url, user)
 
-          def package_type_url(package_type)
-            "/projects/#{project.id}/packages?package_type=#{package_type}"
+          expect(json_response.length).to eq(1)
+          expect(json_response.first['name']).to include(package2.name)
         end
       end
+
+      def package_filter_url(filter, param)
+        "/projects/#{project.id}/packages?package_#{filter}=#{param}"
       end
     end