65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package env
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import (
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"reflect"
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"strings"
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"github.com/containous/traefik/v2/pkg/config/parser"
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)
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// FindPrefixedEnvVars finds prefixed environment variables.
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func FindPrefixedEnvVars(environ []string, prefix string, element interface{}) []string {
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prefixes := getRootPrefixes(element, prefix)
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var values []string
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for _, px := range prefixes {
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for _, value := range environ {
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if strings.HasPrefix(value, px) {
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values = append(values, value)
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}
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}
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}
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return values
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}
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func getRootPrefixes(element interface{}, prefix string) []string {
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if element == nil {
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return nil
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}
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rootType := reflect.TypeOf(element)
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return getPrefixes(prefix, rootType)
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}
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func getPrefixes(prefix string, rootType reflect.Type) []string {
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var names []string
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if rootType.Kind() == reflect.Ptr {
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rootType = rootType.Elem()
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}
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if rootType.Kind() != reflect.Struct {
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return nil
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}
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for i := 0; i < rootType.NumField(); i++ {
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field := rootType.Field(i)
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if !parser.IsExported(field) {
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continue
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}
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if field.Anonymous &&
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(field.Type.Kind() == reflect.Ptr && field.Type.Elem().Kind() == reflect.Struct || field.Type.Kind() == reflect.Struct) {
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names = append(names, getPrefixes(prefix, field.Type)...)
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continue
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}
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names = append(names, prefix+strings.ToUpper(field.Name))
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}
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return names
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}
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