Add clusters_regex to metric urls file

This will be used to match the urls within the banzai filter
for cluster metric embeds

ee/lib/ee/gitlab/metrics/dashboard/url.rb

+# frozen_string_literal: true
+
+# Manages url matching for metrics dashboards.
+module EE
+  module Gitlab
+    module Metrics
+      module Dashboard
+        module Url
+          # Matches dashboard urls for a metric chart embed
+          # for cluster metrics
+          #
+          # EX - https://<host>/<namespace>/<project>/-/clusters/<cluster_id>/?group=Cluster%20Health&title=Memory%20Usage&y_label=Memory%20(GiB)
+          def clusters_regex
+            strong_memoize(:clusters_regex) do
+              regex_for_project_metrics(
+                %r{
+                  /clusters
+                  /(?<cluster_id>\d+)
+                  [/]?
+                }x
+              )
+            end
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/lib/ee/gitlab/metrics/dashboard/url_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Metrics::Dashboard::Url do
+  describe '#clusters_regex' do
+    let(:url) do
+      Gitlab::Routing.url_helpers.namespace_project_cluster_url(
+        'foo',
+        'bar',
+        '1',
+        group: 'Cluster Health',
+        title: 'Memory Usage',
+        y_label: 'Memory 20(GiB)',
+        anchor: 'title'
+      )
+    end
+
+    let(:expected_params) do
+      {
+        'url' => url,
+        'namespace' => 'foo',
+        'project' => 'bar',
+        'cluster_id' => '1',
+        'query' => '?group=Cluster+Health&title=Memory+Usage&y_label=Memory+20%28GiB%29',
+        'anchor' => '#title'
+      }
+    end
+
+    subject { described_class.clusters_regex }
+
+    it_behaves_like 'regex which matches url when expected'
+  end
+end

lib/banzai/filter/inline_metrics_filter.rb

@@ -25,7 +25,7 @@ module Banzai
 
       # Regular expression matching metrics urls
       def link_pattern
-        Gitlab::Metrics::Dashboard::Url.regex
+        Gitlab::Metrics::Dashboard::Url.metrics_regex
       end
 
       private

lib/banzai/filter/inline_metrics_redactor_filter.rb

@@ -59,7 +59,7 @@ module Banzai
             embed = Embed.new
             url = node.attribute('data-dashboard-url').to_s
 
-            set_path_and_permission(embed, url, URL.regex, :read_environment)
+            set_path_and_permission(embed, url, URL.metrics_regex, :read_environment)
             set_path_and_permission(embed, url, URL.grafana_regex, :read_project) unless embed.permission
 
             embeds[node] = embed if embed.permission

lib/gitlab/metrics/dashboard/url.rb

@@ -6,41 +6,36 @@ module Gitlab
     module Dashboard
       class Url
         class << self
+          include Gitlab::Utils::StrongMemoize
           # Matches urls for a metrics dashboard. This could be
           # either the /metrics endpoint or the /metrics_dashboard
           # endpoint.
           #
           # EX - https://<host>/<namespace>/<project>/environments/<env_id>/metrics
-          def regex
-            %r{
-              (?<url>
-                #{gitlab_pattern}
-                #{project_pattern}
-                (?:\/\-)?
-                \/environments
-                \/(?<environment>\d+)
-                \/metrics
-                #{query_pattern}
-                #{anchor_pattern}
+          def metrics_regex
+            strong_memoize(:metrics_regex) do
+              regex_for_project_metrics(
+                %r{
+                    /environments
+                    /(?<environment>\d+)
+                    /metrics
+                }x
               )
-            }x
+            end
           end
 
           # Matches dashboard urls for a Grafana embed.
           #
           # EX - https://<host>/<namespace>/<project>/grafana/metrics_dashboard
           def grafana_regex
-            %r{
-              (?<url>
-                #{gitlab_pattern}
-                #{project_pattern}
-                (?:\/\-)?
-                \/grafana
-                \/metrics_dashboard
-                #{query_pattern}
-                #{anchor_pattern}
+            strong_memoize(:grafana_regex) do
+              regex_for_project_metrics(
+                %r{
+                  /grafana
+                  /metrics_dashboard
+                }x
               )
-            }x
+            end
           end
 
           # Parses query params out from full url string into hash.
@@ -62,11 +57,24 @@ module Gitlab
 
           private
 
-          def gitlab_pattern
+          def regex_for_project_metrics(path_suffix_pattern)
+            %r{
+              (?<url>
+                #{gitlab_host_pattern}
+                #{project_path_pattern}
+                (?:/-)?
+                #{path_suffix_pattern}
+                #{query_pattern}
+                #{anchor_pattern}
+              )
+            }x
+          end
+
+          def gitlab_host_pattern
             Regexp.escape(Gitlab.config.gitlab.url)
           end
 
-          def project_pattern
+          def project_path_pattern
             "\/#{Project.reference_pattern}"
           end
 
@@ -82,3 +90,5 @@ module Gitlab
     end
   end
 end
+
+Gitlab::Metrics::Dashboard::Url.extend_if_ee('::EE::Gitlab::Metrics::Dashboard::Url')

spec/lib/gitlab/metrics/dashboard/url_spec.rb

@@ -3,38 +3,6 @@
 require 'spec_helper'
 
 describe Gitlab::Metrics::Dashboard::Url do
-  shared_examples_for 'a regex which matches the expected url' do
-    it { is_expected.to be_a Regexp }
-
-    it 'matches a metrics dashboard link with named params' do
-      expect(subject).to match url
-
-      subject.match(url) do |m|
-        expect(m.named_captures).to eq expected_params
-      end
-    end
-  end
-
-  shared_examples_for 'does not match non-matching urls' do
-    it 'does not match other gitlab urls that contain the term metrics' do
-      url = Gitlab::Routing.url_helpers.active_common_namespace_project_prometheus_metrics_url('foo', 'bar', :json)
-
-      expect(subject).not_to match url
-    end
-
-    it 'does not match other gitlab urls' do
-      url = Gitlab.config.gitlab.url
-
-      expect(subject).not_to match url
-    end
-
-    it 'does not match non-gitlab urls' do
-      url = 'https://www.super_awesome_site.com/'
-
-      expect(subject).not_to match url
-    end
-  end
-
   describe '#regex' do
     let(:url) do
       Gitlab::Routing.url_helpers.metrics_namespace_project_environment_url(
@@ -59,10 +27,9 @@ describe Gitlab::Metrics::Dashboard::Url do
       }
     end
 
-    subject { described_class.regex }
+    subject { described_class.metrics_regex }
 
-    it_behaves_like 'a regex which matches the expected url'
-    it_behaves_like 'does not match non-matching urls'
+    it_behaves_like 'regex which matches url when expected'
   end
 
   describe '#grafana_regex' do
@@ -89,15 +56,14 @@ describe Gitlab::Metrics::Dashboard::Url do
 
     subject { described_class.grafana_regex }
 
-    it_behaves_like 'a regex which matches the expected url'
-    it_behaves_like 'does not match non-matching urls'
+    it_behaves_like 'regex which matches url when expected'
   end
 
   describe '#build_dashboard_url' do
     it 'builds the url for the dashboard endpoint' do
       url = described_class.build_dashboard_url('foo', 'bar', 1)
 
-      expect(url).to match described_class.regex
+      expect(url).to match described_class.metrics_regex
     end
   end
 end

spec/support/shared_examples/metrics/url_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'regex which matches url when expected' do
+  it { is_expected.to be_a Regexp }
+
+  it 'matches a metrics dashboard link with named params' do
+    expect(subject).to match url
+
+    subject.match(url) do |m|
+      expect(m.named_captures).to eq expected_params
+    end
+  end
+
+  it 'does not match other gitlab urls that contain the term metrics' do
+    url = Gitlab::Routing.url_helpers.active_common_namespace_project_prometheus_metrics_url('foo', 'bar', :json)
+
+    expect(subject).not_to match url
+  end
+
+  it 'does not match other gitlab urls' do
+    url = Gitlab.config.gitlab.url
+
+    expect(subject).not_to match url
+  end
+
+  it 'does not match non-gitlab urls' do
+    url = 'https://www.super_awesome_site.com/'
+
+    expect(subject).not_to match url
+  end
+end