pronounsfu/backend/routes/auth/tumblr.go

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package auth
import (
"encoding/json"
"io"
"net/http"
"os"
"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"
"golang.org/x/oauth2"
)
var tumblrOAuthConfig = oauth2.Config{
ClientID: os.Getenv("TUMBLR_CLIENT_ID"),
ClientSecret: os.Getenv("TUMBLR_CLIENT_SECRET"),
Endpoint: oauth2.Endpoint{
AuthURL: "https://www.tumblr.com/oauth2/authorize",
TokenURL: "https://api.tumblr.com/v2/oauth2/token",
AuthStyle: oauth2.AuthStyleInParams,
},
Scopes: []string{"basic"},
}
type partialTumblrResponse struct {
Meta struct {
Status int `json:"status"`
Message string `json:"msg"`
} `json:"meta"`
Response struct {
User struct {
Blogs []struct {
Name string `json:"name"`
Primary bool `json:"primary"`
UUID string `json:"uuid"`
} `json:"blogs"`
} `json:"user"`
} `json:"response"`
}
type tumblrUserInfo struct {
Name string `json:"name"`
ID string `json:"id"`
}
type tumblrCallbackResponse struct {
HasAccount bool `json:"has_account"` // if true, Token and User will be set. if false, Ticket and Tumblr will be set
Token string `json:"token,omitempty"`
User *userResponse `json:"user,omitempty"`
Tumblr string `json:"tumblr,omitempty"` // username, for UI purposes
Ticket string `json:"ticket,omitempty"`
RequireInvite bool `json:"require_invite"` // require an invite for signing up
RequireCaptcha bool `json:"require_captcha"`
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IsDeleted bool `json:"is_deleted"`
DeletedAt *time.Time `json:"deleted_at,omitempty"`
SelfDelete *bool `json:"self_delete,omitempty"`
DeleteReason *string `json:"delete_reason,omitempty"`
}
func (s *Server) tumblrCallback(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
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decoded, err := Decode[oauthCallbackRequest](r)
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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}
}
cfg := tumblrOAuthConfig
cfg.RedirectURL = decoded.CallbackDomain + "/auth/login/tumblr"
token, err := cfg.Exchange(r.Context(), decoded.Code)
if err != nil {
log.Errorf("exchanging oauth code: %v", err)
return server.APIError{Code: server.ErrInvalidOAuthCode}
}
req, err := http.NewRequestWithContext(ctx, "GET", "https://api.tumblr.com/v2/user/info", nil)
if err != nil {
return errors.Wrap(err, "creating user/info request")
}
req.Header.Set("Content-Type", "application/json")
token.SetAuthHeader(req)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return errors.Wrap(err, "sending user/info request")
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 400 {
return errors.New("response had status code < 200 or >= 400")
}
jb, err := io.ReadAll(resp.Body)
if err != nil {
return errors.Wrap(err, "reading user/info response")
}
var tr partialTumblrResponse
err = json.Unmarshal(jb, &tr)
if err != nil {
return errors.Wrap(err, "unmarshaling user/info response")
}
var tumblrName, tumblrID string
for _, blog := range tr.Response.User.Blogs {
if blog.Primary {
tumblrName = blog.Name
tumblrID = blog.UUID
break
}
}
if tumblrID == "" {
return server.APIError{Code: server.ErrInternalServerError, Details: "Your Tumblr account doesn't seem to have a primary blog"}
}
u, err := s.DB.TumblrUser(ctx, tumblrID)
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, tumblrCallbackResponse{
HasAccount: true,
Token: token,
User: dbUserToUserResponse(u, []db.Field{}),
IsDeleted: true,
DeletedAt: u.DeletedAt,
SelfDelete: u.SelfDelete,
DeleteReason: u.DeleteReason,
})
return nil
}
err = u.UpdateFromTumblr(ctx, s.DB, tumblrID, tumblrName)
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if err != nil {
log.Errorf("updating user %v with Tumblr 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)
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, tumblrCallbackResponse{
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 Tumblr info in Redis
ticket := RandBase64(32)
err = s.DB.SetJSON(ctx, "tumblr:"+ticket, tumblrUserInfo{ID: tumblrID, Name: tumblrName}, "EX", "600")
if err != nil {
log.Errorf("setting Tumblr user for ticket %q: %v", ticket, err)
return err
}
render.JSON(w, r, tumblrCallbackResponse{
HasAccount: false,
Tumblr: tumblrName,
Ticket: ticket,
RequireInvite: s.RequireInvite,
RequireCaptcha: s.hcaptchaSecret != "",
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})
return nil
}
func (s *Server) tumblrLink(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[linkRequest](r)
if err != nil {
return server.APIError{Code: server.ErrBadRequest}
}
u, err := s.DB.User(ctx, claims.UserID)
if err != nil {
return errors.Wrap(err, "getting user")
}
if u.Tumblr != nil {
return server.APIError{Code: server.ErrAlreadyLinked}
}
tui := new(tumblrUserInfo)
err = s.DB.GetJSON(ctx, "tumblr:"+req.Ticket, &tui)
if err != nil {
log.Errorf("getting tumblr user for ticket: %v", err)
return server.APIError{Code: server.ErrInvalidTicket}
}
if tui.ID == "" {
log.Errorf("linking user with id %v: user ID was empty", claims.UserID)
return server.APIError{Code: server.ErrInternalServerError, Details: "Tumblr user ID is empty"}
}
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err = u.UpdateFromTumblr(ctx, s.DB, tui.ID, tui.Name)
if err != nil {
return errors.Wrap(err, "updating user from tumblr")
}
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) tumblrUnlink(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"}
}
u, err := s.DB.User(ctx, claims.UserID)
if err != nil {
return errors.Wrap(err, "getting user")
}
if u.Tumblr == nil {
return server.APIError{Code: server.ErrNotLinked}
}
// cannot unlink last auth provider
if u.NumProviders() <= 1 {
return server.APIError{Code: server.ErrLastProvider}
}
err = u.UnlinkTumblr(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
}
func (s *Server) tumblrSignup(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
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req, err := Decode[signupRequest](r)
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if err != nil {
return server.APIError{Code: server.ErrBadRequest}
}
if s.RequireInvite && req.InviteCode == "" {
return server.APIError{Code: server.ErrInviteRequired}
}
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)
tui := new(tumblrUserInfo)
err = s.DB.GetJSON(ctx, "tumblr:"+req.Ticket, &tui)
if err != nil {
log.Errorf("getting tumblr user for ticket: %v", err)
return server.APIError{Code: server.ErrInvalidTicket}
}
// check captcha
if s.hcaptchaSecret != "" {
ok, err := s.verifyCaptcha(ctx, req.CaptchaResponse)
if err != nil {
log.Errorf("verifying captcha: %v", err)
return server.APIError{Code: server.ErrInternalServerError}
}
if !ok {
return server.APIError{Code: server.ErrInvalidCaptcha}
}
}
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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")
}
if tui.ID == "" {
log.Errorf("creating user with name %q: user ID was empty", req.Username)
return server.APIError{Code: server.ErrInternalServerError, Details: "Tumblr user ID is empty"}
}
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err = u.UpdateFromTumblr(ctx, tx, tui.ID, tui.Name)
if err != nil {
return errors.Wrap(err, "updating user from tumblr")
}
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", "tumblr:"+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)
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
}