use existing oauth grant for public client (#31015)

Do not try to create a new authorization grant when one exists already,
thus preventing a DB-related authorization issue.

Fix https://github.com/go-gitea/gitea/pull/30790#issuecomment-2118812426

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
(cherry picked from commit 9c8c9ff6d10b35de8d2d7eae0fc2646ad9bbe94a)
(cherry picked from commit 07fe5a8b13)
This commit is contained in:
Denys Konovalov 2024-05-21 18:23:49 +02:00 committed by Earl Warren
parent a228ab3ab2
commit 0c770d528f
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View file

@ -556,15 +556,30 @@ func GrantApplicationOAuth(ctx *context.Context) {
ctx.ServerError("GetOAuth2ApplicationByClientID", err)
return
}
grant, err := app.CreateGrant(ctx, ctx.Doer.ID, form.Scope)
grant, err := app.GetGrantByUserID(ctx, ctx.Doer.ID)
if err != nil {
handleServerError(ctx, form.State, form.RedirectURI)
return
}
if grant == nil {
grant, err = app.CreateGrant(ctx, ctx.Doer.ID, form.Scope)
if err != nil {
handleAuthorizeError(ctx, AuthorizeError{
State: form.State,
ErrorDescription: "cannot create grant for user",
ErrorCode: ErrorCodeServerError,
}, form.RedirectURI)
return
}
} else if grant.Scope != form.Scope {
handleAuthorizeError(ctx, AuthorizeError{
State: form.State,
ErrorDescription: "cannot create grant for user",
ErrorDescription: "a grant exists with different scope",
ErrorCode: ErrorCodeServerError,
}, form.RedirectURI)
return
}
if len(form.Nonce) > 0 {
err := grant.SetNonce(ctx, form.Nonce)
if err != nil {