pronounsfu/backend/routes/auth/fediverse.go

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package auth
import (
"context"
"encoding/json"
"io"
"net/http"
"net/url"
"strings"
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"codeberg.org/pronounscc/pronouns.cc/backend/log"
"codeberg.org/pronounscc/pronouns.cc/backend/server"
"emperror.dev/errors"
"github.com/go-chi/render"
)
type FediResponse struct {
URL string `json:"url"`
}
func (s *Server) getFediverseURL(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
instance := r.FormValue("instance")
if instance == "" {
return server.APIError{Code: server.ErrBadRequest, Details: "Instance URL is empty"}
}
// Too many people tried using @username@fediverse.example despite the warning
if strings.Contains(instance, "@") {
return server.APIError{Code: server.ErrBadRequest, Details: "Instance URL should only be the base URL, without username"}
}
app, err := s.DB.FediverseApp(ctx, instance)
if err != nil {
return s.noAppFediverseURL(ctx, w, r, instance)
}
if app.Misskey() {
_, url, err := s.misskeyURL(ctx, app)
if err != nil {
return errors.Wrap(err, "generating misskey URL")
}
render.JSON(w, r, FediResponse{
URL: url,
})
return nil
}
state, err := s.setCSRFState(r.Context())
if err != nil {
return errors.Wrap(err, "setting CSRF state")
}
render.JSON(w, r, FediResponse{
URL: app.ClientConfig().AuthCodeURL(state),
})
return nil
}
func (s *Server) noAppFediverseURL(ctx context.Context, w http.ResponseWriter, r *http.Request, instance string) error {
softwareName, err := nodeinfo(ctx, instance)
if err != nil {
log.Errorf("querying instance %q nodeinfo: %v", instance, err)
}
switch softwareName {
case "misskey", "foundkey", "calckey", "firefish":
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return s.noAppMisskeyURL(ctx, w, r, softwareName, instance)
case "mastodon", "pleroma", "akkoma", "pixelfed", "gotosocial":
case "glitchcafe", "hometown":
// plural.cafe (potentially other instances too?) runs Mastodon but changes the software name
// Hometown is a lightweight fork of Mastodon so we can just treat it the same
// changing it back to mastodon here for consistency
softwareName = "mastodon"
default:
return server.APIError{Code: server.ErrUnsupportedInstance}
}
log.Debugf("creating application on mastodon-compatible instance %q", instance)
formData := url.Values{
"client_name": {"pronouns.cc (+" + s.BaseURL + ")"},
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"redirect_uris": {s.BaseURL + "/auth/login/mastodon/" + instance},
"scopes": {"read:accounts"},
"website": {s.BaseURL},
}
req, err := http.NewRequestWithContext(ctx, "POST", "https://"+instance+"/api/v1/apps", strings.NewReader(formData.Encode()))
if err != nil {
log.Errorf("creating POST apps request for %q: %v", instance, err)
return errors.Wrap(err, "creating POST apps request")
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("User-Agent", "pronouns.cc/"+server.Tag)
resp, err := http.DefaultClient.Do(req)
if err != nil {
log.Errorf("sending POST apps request for %q: %v", instance, err)
return errors.Wrap(err, "sending POST apps request")
}
defer resp.Body.Close()
jb, err := io.ReadAll(resp.Body)
if err != nil {
log.Errorf("reading response for request: %v", err)
return errors.Wrap(err, "reading response")
}
var ma mastodonApplication
err = json.Unmarshal(jb, &ma)
if err != nil {
return errors.Wrap(err, "unmarshaling mastodon app")
}
app, err := s.DB.CreateFediverseApp(ctx, instance, softwareName, ma.ClientID, ma.ClientSecret)
if err != nil {
log.Errorf("saving app for %q: %v", instance, err)
return errors.Wrap(err, "creating app")
}
state, err := s.setCSRFState(r.Context())
if err != nil {
return errors.Wrap(err, "setting CSRF state")
}
render.JSON(w, r, FediResponse{
URL: app.ClientConfig().AuthCodeURL(state),
})
return nil
}
type mastodonApplication struct {
Name string `json:"name"`
ClientID string `json:"client_id"`
ClientSecret string `json:"client_secret"`
}