chore: import upstream snapshot with attribution

plugin/cdn.go

@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package plugin
+
+var (
+	DefaultCDNFileType = map[string]bool{
+		".ico":   true,
+		".json":  true,
+		".css":   true,
+		".js":    true,
+		".webp":  true,
+		".woff2": true,
+		".woff":  true,
+		".jpg":   true,
+		".svg":   true,
+		".png":   true,
+		".map":   true,
+		".txt":   true,
+	}
+)
+
+type CDN interface {
+	Base
+	GetStaticPrefix() string
+}
+
+var (
+	// CallCDN is a function that calls all registered parsers
+	CallCDN,
+	registerCDN = MakePlugin[CDN](false)
+)
+
+func coordinatedCDNPlugins(slugName string) (enabledSlugNames []string) {
+	isCDN := false
+	_ = CallCDN(func(cdn CDN) error {
+		name := cdn.Info().SlugName
+		if slugName == name {
+			isCDN = true
+		} else {
+			enabledSlugNames = append(enabledSlugNames, name)
+		}
+		return nil
+	})
+	if isCDN {
+		return enabledSlugNames
+	}
+	return nil
+}