Add Properties type

Signed-off-by: ItalyPaleAle <[email protected]>

metadata/properties.go

@@ -0,0 +1,34 @@
+/*
+Copyright 2024 The Dapr Authors
+Licensed 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 metadata
+
+// Properties contains metadata properties, as a key-value dictionary
+type Properties map[string]string
+
+// GetProperty returns a property from the metadata, with support for case-insensitive keys and aliases.
+func (p Properties) GetProperty(keys ...string) (val string, ok bool) {
+	return GetMetadataProperty(p, keys...)
+}
+
+// GetPropertyWithMatchedKey returns a property from the metadata, with support for case-insensitive keys and aliases,
+// while returning the original matching metadata field key.
+func (p Properties) GetPropertyWithMatchedKey(keys ...string) (key string, val string, ok bool) {
+	return GetMetadataPropertyWithMatchedKey(p, keys...)
+}
+
+// Decode decodes  metadata into a struct.
+// This is an extension of mitchellh/mapstructure which also supports decoding durations.
+func (p Properties) Decode(result any) error {
+	return decodeMetadataMap(p, result)
+}

metadata/utils.go

@@ -62,8 +62,12 @@ func DecodeMetadata(input any, result any) error {
 		return fmt.Errorf("input object cannot be cast to map[string]string: %w", err)
 	}
 
+	return decodeMetadataMap(inputMap, result)
+}
+
+func decodeMetadataMap(inputMap map[string]string, result any) error {
 	// Handle aliases
-	err = resolveAliases(inputMap, reflect.TypeOf(result))
+	err := resolveAliases(inputMap, reflect.TypeOf(result))
 	if err != nil {
 		return fmt.Errorf("failed to resolve aliases: %w", err)
 	}