allow re-invitations of existing users (#4768)

* allow re-invitations of existing users

* auto-accept existing user if mail is disabled

Apply suggestions from code review

Co-authored-by: Mathijs van Veluw <black.dex@gmail.com>

---------

Co-authored-by: Mathijs van Veluw <black.dex@gmail.com>

src/api/core/organizations.rs

@@ -997,14 +997,6 @@ async fn reinvite_user(org_id: &str, user_org: &str, headers: AdminHeaders, mut
 }
 
 async fn _reinvite_user(org_id: &str, user_org: &str, invited_by_email: &str, conn: &mut DbConn) -> EmptyResult {
-    if !CONFIG.invitations_allowed() {
-        err!("Invitations are not allowed.")
-    }
-
-    if !CONFIG.mail_enabled() {
-        err!("SMTP is not configured.")
-    }
-
     let user_org = match UserOrganization::find_by_uuid(user_org, conn).await {
         Some(user_org) => user_org,
         None => err!("The user hasn't been invited to the organization."),
@@ -1019,6 +1011,10 @@ async fn _reinvite_user(org_id: &str, user_org: &str, invited_by_email: &str, co
         None => err!("User not found."),
     };
 
+    if !CONFIG.invitations_allowed() && user.password_hash.is_empty() {
+        err!("Invitations are not allowed.")
+    }
+
     let org_name = match Organization::find_by_uuid(org_id, conn).await {
         Some(org) => org.name,
         None => err!("Error looking up organization."),
@@ -1034,9 +1030,14 @@ async fn _reinvite_user(org_id: &str, user_org: &str, invited_by_email: &str, co
             Some(invited_by_email.to_string()),
         )
         .await?;
-    } else {
+    } else if user.password_hash.is_empty() {
         let invitation = Invitation::new(&user.email);
         invitation.save(conn).await?;
+    } else {
+        let _ = Invitation::take(&user.email, conn).await;
+        let mut user_org = user_org;
+        user_org.status = UserOrgStatus::Accepted as i32;
+        user_org.save(conn).await?;
     }
 
     Ok(())