owncast/activitypub/webfinger/webfinger.go

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package webfinger
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/owncast/owncast/utils"
)
// GetWebfingerLinks will return webfinger data for an account.
func GetWebfingerLinks(account string) ([]map[string]interface{}, error) {
type webfingerResponse struct {
Links []map[string]interface{} `json:"links"`
}
account = strings.TrimLeft(account, "@") // remove any leading @
accountComponents := strings.Split(account, "@")
fediverseServer := accountComponents[1]
// Reject any requests to our internal network or loopback.
if utils.IsHostnameInternal(fediverseServer) {
return nil, errors.New("unable to use provided host as a valid fediverse server")
}
// HTTPS is required.
requestURL, err := url.Parse("https://" + fediverseServer)
if err != nil {
return nil, fmt.Errorf("unable to parse fediverse server host %s", fediverseServer)
}
requestURL.Path = "/.well-known/webfinger"
query := requestURL.Query()
query.Add("resource", fmt.Sprintf("acct:%s", account))
requestURL.RawQuery = query.Encode()
// Do not support redirects.
client := &http.Client{
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
}
response, err := client.Get(requestURL.String())
if err != nil {
return nil, err
}
defer response.Body.Close()
var links webfingerResponse
decoder := json.NewDecoder(response.Body)
if err := decoder.Decode(&links); err != nil {
return nil, err
}
return links.Links, nil
}