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// utils.go - Katzenpost client utilities.
// Copyright (C) 2018 David Stainton.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <>.
package utils
import (
// ServiceDescriptor describe a mixnet Provider-side service.
type ServiceDescriptor struct {
// Name of the service.
Name string
// Provider name.
Provider string
// FindServices is a helper function for finding Provider-side services in the PKI document.
func FindServices(capability string, doc *pki.Document) []ServiceDescriptor {
services := []ServiceDescriptor{}
for _, provider := range doc.Providers {
for cap := range provider.Kaetzchen {
if cap == capability {
serviceID := ServiceDescriptor{
Name: provider.Kaetzchen[cap]["endpoint"].(string),
Provider: provider.Name,
services = append(services, serviceID)
return services
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