pronounsfu/backend/routes/auth/fedi_misskey.go

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package auth
import (
"bytes"
"context"
"encoding/json"
"io"
"net/http"
"codeberg.org/u1f320/pronouns.cc/backend/db"
"codeberg.org/u1f320/pronouns.cc/backend/log"
"codeberg.org/u1f320/pronouns.cc/backend/server"
"emperror.dev/errors"
"github.com/go-chi/render"
"github.com/mediocregopher/radix/v4"
"github.com/rs/xid"
)
type partialMisskeyAccount struct {
ID string `json:"id"`
Username string `json:"username"`
}
func (s *Server) misskeyCallback(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
decoded, err := Decode[fediOauthCallbackRequest](r)
if err != nil {
return server.APIError{Code: server.ErrBadRequest}
}
app, err := s.DB.FediverseApp(ctx, decoded.Instance)
if err != nil {
log.Errorf("getting app for instance %q: %v", decoded.Instance, err)
if err == db.ErrNoInstanceApp {
// can we get here?
return server.APIError{Code: server.ErrNotFound}
}
}
userkeyReq := struct {
AppSecret string `json:"appSecret"`
Token string `json:"token"`
}{AppSecret: app.ClientSecret, Token: decoded.Code}
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b, err := json.Marshal(userkeyReq)
if err != nil {
return errors.Wrap(err, "marshaling json")
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}
// make me user request
req, err := http.NewRequestWithContext(ctx, "POST", "https://"+decoded.Instance+"/api/auth/session/userkey", bytes.NewReader(b))
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if err != nil {
return errors.Wrap(err, "creating userkey request")
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}
req.Header.Set("User-Agent", "pronouns.cc/"+server.Tag)
req.Header.Set("Accept", "application/json")
req.Header.Set("Content-Type", "application/json")
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resp, err := http.DefaultClient.Do(req)
if err != nil {
return errors.Wrap(err, "sending i request")
}
defer resp.Body.Close()
jb, err := io.ReadAll(resp.Body)
if err != nil {
return errors.Wrap(err, "reading i response")
}
if resp.StatusCode < 200 || resp.StatusCode >= 400 {
log.Errorf("POST userkey for instance %q (type %v): %v", app.Instance, app.InstanceType, string(jb))
return errors.Wrap(err, "error on misskey's end")
}
var mu struct {
User partialMisskeyAccount `json:"user"`
}
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err = json.Unmarshal(jb, &mu)
if err != nil {
return errors.Wrap(err, "unmarshaling userkey response")
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}
u, err := s.DB.FediverseUser(ctx, mu.User.ID, app.ID)
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if err == nil {
if u.DeletedAt != nil {
// store cancel delete token
token := undeleteToken()
err = s.saveUndeleteToken(ctx, u.ID, token)
if err != nil {
log.Errorf("saving undelete token: %v", err)
return err
}
render.JSON(w, r, fediCallbackResponse{
HasAccount: true,
Token: token,
User: dbUserToUserResponse(u, []db.Field{}),
IsDeleted: true,
DeletedAt: u.DeletedAt,
SelfDelete: u.SelfDelete,
DeleteReason: u.DeleteReason,
})
return nil
}
err = u.UpdateFromFedi(ctx, s.DB, mu.User.ID, mu.User.Username, app.ID)
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if err != nil {
log.Errorf("updating user %v with misskey info: %v", u.ID, err)
}
// TODO: implement user + token permissions
tokenID := xid.New()
token, err := s.Auth.CreateToken(u.ID, tokenID, u.IsAdmin, false, true)
if err != nil {
return err
}
// save token to database
_, err = s.DB.SaveToken(ctx, u.ID, tokenID, false, false)
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if err != nil {
return errors.Wrap(err, "saving token to database")
}
fields, err := s.DB.UserFields(ctx, u.ID)
if err != nil {
return errors.Wrap(err, "querying fields")
}
render.JSON(w, r, fediCallbackResponse{
HasAccount: true,
Token: token,
User: dbUserToUserResponse(u, fields),
})
return nil
} else if err != db.ErrUserNotFound { // internal error
return err
}
// no user found, so save a ticket + save their Misskey info in Redis
ticket := RandBase64(32)
err = s.DB.SetJSON(ctx, "misskey:"+ticket, mu.User, "EX", "600")
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if err != nil {
log.Errorf("setting misskey user for ticket %q: %v", ticket, err)
return err
}
render.JSON(w, r, fediCallbackResponse{
HasAccount: false,
Fediverse: mu.User.Username,
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Ticket: ticket,
RequireInvite: s.RequireInvite,
})
return nil
}
func (s *Server) misskeyLink(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
claims, _ := server.ClaimsFromContext(ctx)
// only site tokens can be used for this endpoint
if claims.APIToken {
return server.APIError{Code: server.ErrMissingPermissions, Details: "This endpoint cannot be used by API tokens"}
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}
req, err := Decode[fediLinkRequest](r)
if err != nil {
return server.APIError{Code: server.ErrBadRequest}
}
app, err := s.DB.FediverseApp(ctx, req.Instance)
if err != nil {
return errors.Wrap(err, "getting instance application")
}
u, err := s.DB.User(ctx, claims.UserID)
if err != nil {
return errors.Wrap(err, "getting user")
}
if u.Fediverse != nil {
return server.APIError{Code: server.ErrAlreadyLinked}
}
mu := new(partialMisskeyAccount)
err = s.DB.GetJSON(ctx, "misskey:"+req.Ticket, &mu)
if err != nil {
log.Errorf("getting misskey user for ticket: %v", err)
return server.APIError{Code: server.ErrInvalidTicket}
}
err = u.UpdateFromFedi(ctx, s.DB, mu.ID, mu.Username, app.ID)
if err != nil {
return errors.Wrap(err, "updating user from misskey")
}
fields, err := s.DB.UserFields(ctx, u.ID)
if err != nil {
return errors.Wrap(err, "getting user fields")
}
render.JSON(w, r, dbUserToUserResponse(u, fields))
return nil
}
func (s *Server) misskeySignup(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
req, err := Decode[fediSignupRequest](r)
if err != nil {
return server.APIError{Code: server.ErrBadRequest}
}
if s.RequireInvite && req.InviteCode == "" {
return server.APIError{Code: server.ErrInviteRequired}
}
app, err := s.DB.FediverseApp(ctx, req.Instance)
if err != nil {
return errors.Wrap(err, "getting instance application")
}
valid, taken, err := s.DB.UsernameTaken(ctx, req.Username)
if err != nil {
return err
}
if !valid {
return server.APIError{Code: server.ErrInvalidUsername}
}
if taken {
return server.APIError{Code: server.ErrUsernameTaken}
}
tx, err := s.DB.Begin(ctx)
if err != nil {
return errors.Wrap(err, "beginning transaction")
}
defer tx.Rollback(ctx)
mu := new(partialMisskeyAccount)
err = s.DB.GetJSON(ctx, "misskey:"+req.Ticket, &mu)
if err != nil {
log.Errorf("getting misskey user for ticket: %v", err)
return server.APIError{Code: server.ErrInvalidTicket}
}
u, err := s.DB.CreateUser(ctx, tx, req.Username)
if err != nil {
if errors.Cause(err) == db.ErrUsernameTaken {
return server.APIError{Code: server.ErrUsernameTaken}
}
return errors.Wrap(err, "creating user")
}
err = u.UpdateFromFedi(ctx, tx, mu.ID, mu.Username, app.ID)
if err != nil {
return errors.Wrap(err, "updating user from misskey")
}
if s.RequireInvite {
valid, used, err := s.DB.InvalidateInvite(ctx, tx, req.InviteCode)
if err != nil {
return errors.Wrap(err, "checking and invalidating invite")
}
if !valid {
return server.APIError{Code: server.ErrInviteRequired}
}
if used {
return server.APIError{Code: server.ErrInviteAlreadyUsed}
}
}
// delete sign up ticket
err = s.DB.Redis.Do(ctx, radix.Cmd(nil, "DEL", "misskey:"+req.Ticket))
if err != nil {
return errors.Wrap(err, "deleting signup ticket")
}
// commit transaction
err = tx.Commit(ctx)
if err != nil {
return errors.Wrap(err, "committing transaction")
}
// create token
// TODO: implement user + token permissions
tokenID := xid.New()
token, err := s.Auth.CreateToken(u.ID, tokenID, false, false, true)
if err != nil {
return errors.Wrap(err, "creating token")
}
// save token to database
_, err = s.DB.SaveToken(ctx, u.ID, tokenID, false, false)
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if err != nil {
return errors.Wrap(err, "saving token to database")
}
// return user
render.JSON(w, r, signupResponse{
User: *dbUserToUserResponse(u, nil),
Token: token,
})
return nil
}
func (s *Server) noAppMisskeyURL(ctx context.Context, w http.ResponseWriter, r *http.Request, softwareName, instance string) error {
log.Debugf("creating application on misskey-compatible instance %q", instance)
b, err := json.Marshal(misskeyAppRequest{
Name: "pronouns.cc (+" + s.BaseURL + ")",
Description: "pronouns.cc on " + s.BaseURL,
CallbackURL: s.BaseURL + "/auth/login/misskey/" + instance,
Permission: []string{"read:account"},
})
if err != nil {
log.Errorf("marshaling app json: %v", err)
return errors.Wrap(err, "marshaling json")
}
req, err := http.NewRequestWithContext(ctx, "POST", "https://"+instance+"/api/app/create", bytes.NewReader(b))
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/json")
req.Header.Set("User-Agent", "pronouns.cc/"+server.Tag)
req.Header.Set("Content-Type", "application/json")
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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 misskeyApp
err = json.Unmarshal(jb, &ma)
if err != nil {
return errors.Wrap(err, "unmarshaling misskey app")
}
app, err := s.DB.CreateFediverseApp(ctx, instance, softwareName, ma.ID, ma.Secret)
if err != nil {
log.Errorf("saving app for %q: %v", instance, err)
return errors.Wrap(err, "creating app")
}
_, url, err := s.misskeyURL(ctx, app)
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if err != nil {
log.Errorf("generating URL for misskey %q: %v", instance, err)
return errors.Wrap(err, "generating URL")
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}
render.JSON(w, r, FediResponse{
URL: url,
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})
return nil
}
type misskeyAppRequest struct {
Name string `json:"name"`
Description string `json:"description"`
Permission []string `json:"permission"`
CallbackURL string `json:"callbackUrl"`
}
type misskeyApp struct {
ID string `json:"id"`
Secret string `json:"secret"`
}
func (s *Server) misskeyURL(ctx context.Context, app db.FediverseApp) (token, url string, err error) {
genSession := struct {
AppSecret string `json:"appSecret"`
}{AppSecret: app.ClientSecret}
b, err := json.Marshal(genSession)
if err != nil {
return token, url, errors.Wrap(err, "marshaling json")
}
req, err := http.NewRequestWithContext(ctx, "POST", "https://"+app.Instance+"/api/auth/session/generate", bytes.NewReader(b))
if err != nil {
log.Errorf("creating POST session request for %q: %v", app.Instance, err)
return token, url, errors.Wrap(err, "creating POST apps request")
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("User-Agent", "pronouns.cc/"+server.Tag)
req.Header.Set("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
log.Errorf("sending POST session request for %q: %v", app.Instance, err)
return token, url, 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 token, url, errors.Wrap(err, "reading response")
}
var genSessionResp struct {
Token string `json:"token"`
URL string `json:"url"`
}
err = json.Unmarshal(jb, &genSessionResp)
if err != nil {
return token, url, errors.Wrap(err, "unmarshaling misskey response")
}
return genSessionResp.Token, genSessionResp.URL, nil
}