mirror of https://github.com/dapr/kit.git
67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package config
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import (
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"strings"
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"unicode"
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)
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func PrefixedBy(input interface{}, prefix string) (interface{}, error) {
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normalized, err := Normalize(input)
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if err != nil {
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// The only error that can come from normalize is if
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// input is a map[interface{}]interface{} and contains
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// a key that is not a string.
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return input, err
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}
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input = normalized
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if inputMap, ok := input.(map[string]interface{}); ok {
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converted := make(map[string]interface{}, len(inputMap))
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for k, v := range inputMap {
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if strings.HasPrefix(k, prefix) {
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key := uncapitalize(strings.TrimPrefix(k, prefix))
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converted[key] = v
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}
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}
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return converted, nil
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} else if inputMap, ok := input.(map[string]string); ok {
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converted := make(map[string]string, len(inputMap))
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for k, v := range inputMap {
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if strings.HasPrefix(k, prefix) {
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key := uncapitalize(strings.TrimPrefix(k, prefix))
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converted[key] = v
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}
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}
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return converted, nil
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}
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return input, nil
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}
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// uncapitalize initial capital letters in `str`.
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func uncapitalize(str string) string {
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if len(str) == 0 {
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return str
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}
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vv := []rune(str) // Introduced later
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vv[0] = unicode.ToLower(vv[0])
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return string(vv)
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}
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