webfinger.go 2.02 KB
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package federation
//
// GangGo Diaspora Federation Library
// Copyright (C) 2017 Lukas Matt <lukas@zauberstuhl.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// 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
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import (
  "encoding/xml"
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  "fmt"
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  "errors"
)

type WebFinger struct {
  Host string
  Handle string
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  Json WebfingerJson
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}

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// TODO XML webfinger is deprecated but
// still used in host-meta which is required
// for a successful pod-active check
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type WebfingerXml struct {
  XMLName xml.Name `xml:"XRD"`
  Xmlns string `xml:"xmlns,attr"`
  Subject string `xml:"Subject,omitempty"`
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  Alias string `xml:"Alias,omitempty"`
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  Links []WebfingerXmlLink `xml:"Link"`
}

type WebfingerXmlLink struct {
  XMLName xml.Name `xml:"Link"`
  Rel string `xml:"rel,attr"`
  Type string `xml:"type,attr"`
  Template string `xml:"template,attr,omitempty"`
  Href string `xml:"href,attr,omitempty"`
}

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type WebfingerJson struct {
  Subject string `json:"subject"`
  Aliases []string `json:"aliases"`
  Links []WebfingerJsonLink `json:"links"`
}

type WebfingerJsonLink struct {
  Rel string `json:"rel"`
  Type string `json:"type,omitempty"`
  Href string `json:"href,omitempty"`
  Template string `json:"template,omitempty"`
}

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func (w *WebFinger) Discovery() error {
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  url := fmt.Sprintf("%s/.well-known/webfinger?resource=acct:%s", w.Host, w.Handle)
  err := FetchJson("GET", url, nil, &w.Json)
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  if err != nil {
    return err
  }
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  if len(w.Json.Links) < 1 {
    return errors.New("Webfinger Links missing")
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  }
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  return nil
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}