84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
/*
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Copyright 2021 The cert-manager 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 configfile
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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type configurationFSLoader struct {
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readFileFunc func(filename string) ([]byte, error)
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filename string
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}
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type ConfigFile interface {
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DecodeAndConfigure([]byte) error
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GetPathRefs() ([]*string, error)
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}
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func (f *configurationFSLoader) Load(config ConfigFile) error {
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data, err := f.readFileFunc(f.filename)
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if err != nil {
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return fmt.Errorf("failed to read config file %q, error: %v", f.filename, err)
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}
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if len(data) == 0 {
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return fmt.Errorf("config file %q was empty", f.filename)
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}
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if err := config.DecodeAndConfigure(data); err != nil {
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return err
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}
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// make all paths absolute
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if paths, err := config.GetPathRefs(); err != nil {
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return err
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} else {
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resolveRelativePaths(paths, filepath.Dir(f.filename))
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}
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return nil
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}
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func NewConfigurationFSLoader(readFileFunc func(filename string) ([]byte, error), filename string) (*configurationFSLoader, error) {
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var f func(string) ([]byte, error)
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// Default the readfile function to use os.Readfile for convenience.
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if readFileFunc == nil {
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f = os.ReadFile
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} else {
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f = readFileFunc
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}
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return &configurationFSLoader{
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readFileFunc: f,
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filename: filename,
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}, nil
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}
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func resolveRelativePaths(paths []*string, root string) {
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for _, path := range paths {
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// leave empty paths alone, "no path" is a valid input
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// do not attempt to resolve paths that are already absolute
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if len(*path) > 0 && !filepath.IsAbs(*path) {
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*path = filepath.Join(root, *path)
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}
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}
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}
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