ntfy/cmd/config_loader.go

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package cmd
import (
"fmt"
"github.com/urfave/cli/v2"
"github.com/urfave/cli/v2/altsrc"
"gopkg.in/yaml.v2"
"heckel.io/ntfy/util"
"os"
)
// initConfigFileInputSourceFunc is like altsrc.InitInputSourceWithContext and altsrc.NewYamlSourceFromFlagFunc, but checks
// if the config flag is exists and only loads it if it does. If the flag is set and the file exists, it fails.
func initConfigFileInputSourceFunc(configFlag string, flags []cli.Flag) cli.BeforeFunc {
return func(context *cli.Context) error {
configFile := context.String(configFlag)
if context.IsSet(configFlag) && !util.FileExists(configFile) {
return fmt.Errorf("config file %s does not exist", configFile)
} else if !context.IsSet(configFlag) && !util.FileExists(configFile) {
return nil
}
inputSource, err := newYamlSourceFromFile(configFile, flags)
if err != nil {
return err
}
return altsrc.ApplyInputSourceValues(context, inputSource, flags)
}
}
// newYamlSourceFromFile creates a new Yaml InputSourceContext from a filepath.
//
// This function also maps aliases, so a .yml file can contain short options, or options with underscores
// instead of dashes. See https://github.com/binwiederhier/ntfy/issues/255.
func newYamlSourceFromFile(file string, flags []cli.Flag) (altsrc.InputSourceContext, error) {
var rawConfig map[interface{}]interface{}
b, err := os.ReadFile(file)
if err != nil {
return nil, err
}
if err := yaml.Unmarshal(b, &rawConfig); err != nil {
return nil, err
}
for _, f := range flags {
flagName := f.Names()[0]
for _, flagAlias := range f.Names()[1:] {
if _, ok := rawConfig[flagAlias]; ok {
rawConfig[flagName] = rawConfig[flagAlias]
}
}
}
return altsrc.NewMapInputSource(file, rawConfig), nil
}