pronounsfu/backend/routes/auth/fedi_mastodon.go

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package auth
import (
"encoding/json"
"io"
"net/http"
"time"
"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 fediOauthCallbackRequest struct {
Instance string `json:"instance"`
Code string `json:"code"`
State string `json:"state"`
}
type fediCallbackResponse struct {
HasAccount bool `json:"has_account"` // if true, Token and User will be set. if false, Ticket and Fediverse will be set
Token string `json:"token,omitempty"`
User *userResponse `json:"user,omitempty"`
Fediverse string `json:"fediverse,omitempty"` // username, for UI purposes
Ticket string `json:"ticket,omitempty"`
RequireInvite bool `json:"require_invite"` // require an invite for signing up
IsDeleted bool `json:"is_deleted"`
DeletedAt *time.Time `json:"deleted_at,omitempty"`
SelfDelete *bool `json:"self_delete,omitempty"`
DeleteReason *string `json:"delete_reason,omitempty"`
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}
type partialMastodonAccount struct {
ID string `json:"id"`
Username string `json:"username"`
}
func (s *Server) mastodonCallback(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
decoded, err := Decode[fediOauthCallbackRequest](r)
if err != nil {
return server.APIError{Code: server.ErrBadRequest}
}
// if the state can't be validated, return
if valid, err := s.validateCSRFState(ctx, decoded.State); !valid {
if err != nil {
return err
}
return server.APIError{Code: server.ErrInvalidState}
}
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}
}
}
token, err := app.ClientConfig().Exchange(ctx, decoded.Code)
if err != nil {
log.Errorf("exchanging oauth code: %v", err)
return server.APIError{Code: server.ErrInvalidOAuthCode}
}
// make me user request
req, err := http.NewRequestWithContext(ctx, "GET", "https://"+decoded.Instance+"/api/v1/accounts/verify_credentials", nil)
if err != nil {
return errors.Wrap(err, "creating verify_credentials request")
}
req.Header.Set("User-Agent", "pronouns.cc/"+server.Tag)
req.Header.Set("Accept", "application/json")
req.Header.Set("Authorization", token.Type()+" "+token.AccessToken)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return errors.Wrap(err, "sending verify_credentials request")
}
defer resp.Body.Close()
jb, err := io.ReadAll(resp.Body)
if err != nil {
return errors.Wrap(err, "reading verify_credentials response")
}
var mu partialMastodonAccount
err = json.Unmarshal(jb, &mu)
if err != nil {
return errors.Wrap(err, "unmarshaling verify_credentials response")
}
u, err := s.DB.FediverseUser(ctx, mu.ID, app.ID)
if err == nil {
if u.DeletedAt != nil {
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// 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,
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})
return nil
}
err = u.UpdateFromFedi(ctx, s.DB, mu.ID, mu.Username, app.ID)
if err != nil {
log.Errorf("updating user %v with mastoAPI info: %v", u.ID, err)
}
// TODO: implement user + token permissions
tokenID := xid.New()
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token, err := s.Auth.CreateToken(u.ID, tokenID, u.IsAdmin, false, true)
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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 Mastodon info in Redis
ticket := RandBase64(32)
err = s.DB.SetJSON(ctx, "mastodon:"+ticket, mu, "EX", "600")
if err != nil {
log.Errorf("setting mastoAPI user for ticket %q: %v", ticket, err)
return err
}
render.JSON(w, r, fediCallbackResponse{
HasAccount: false,
Fediverse: mu.Username,
Ticket: ticket,
RequireInvite: s.RequireInvite,
})
return nil
}
type fediLinkRequest struct {
Instance string `json:"instance"`
Ticket string `json:"ticket"`
}
func (s *Server) mastodonLink(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"}
}
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(partialMastodonAccount)
err = s.DB.GetJSON(ctx, "mastodon:"+req.Ticket, &mu)
if err != nil {
log.Errorf("getting mastoAPI 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 mastoAPI")
}
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
}
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func (s *Server) mastodonUnlink(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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}
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.ErrNotLinked}
}
// cannot unlink last auth provider
if u.NumProviders() <= 1 {
return server.APIError{Code: server.ErrLastProvider}
}
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err = u.UnlinkFedi(ctx, s.DB)
if err != nil {
return errors.Wrap(err, "updating user in db")
}
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
}
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type fediSignupRequest struct {
Instance string `json:"instance"`
Ticket string `json:"ticket"`
Username string `json:"username"`
InviteCode string `json:"invite_code"`
}
func (s *Server) mastodonSignup(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(partialMastodonAccount)
err = s.DB.GetJSON(ctx, "mastodon:"+req.Ticket, &mu)
if err != nil {
log.Errorf("getting mastoAPI 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}
}
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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 mastoAPI")
}
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", "mastodon:"+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
}