Add authentication from upstream providers (#107)

Let BasicOIDC delegate authentication to upstream providers (Google, GitHub, GitLab, Keycloak...)

Reviewed-on: #107

src/data/users_file_entity.rs

@@ -1,6 +1,6 @@
 use std::net::IpAddr;
 
-use crate::actors::users_actor::UsersSyncBackend;
+use crate::actors::users_actor::{AuthorizedAuthenticationSources, UsersSyncBackend};
 use crate::data::entity_manager::EntityManager;
 use crate::data::user::{FactorID, GeneralSettings, GrantedClients, TwoFactor, User, UserID};
 use crate::utils::err::{new_error, Res};
@@ -41,6 +41,15 @@ fn verify_password<P: AsRef<[u8]>>(pwd: P, hash: &str) -> bool {
 }
 
 impl UsersSyncBackend for EntityManager<User> {
+    fn find_by_email(&self, u: &str) -> Res<Option<User>> {
+        for entry in self.iter() {
+            if entry.email.eq(u) {
+                return Ok(Some(entry.clone()));
+            }
+        }
+        Ok(None)
+    }
+
     fn find_by_username_or_email(&self, u: &str) -> Res<Option<User>> {
         for entry in self.iter() {
             if entry.username.eq(u) || entry.email.eq(u) {
@@ -143,6 +152,18 @@ impl UsersSyncBackend for EntityManager<User> {
         self.remove(&user)
     }
 
+    fn set_authorized_authentication_sources(
+        &mut self,
+        id: &UserID,
+        sources: AuthorizedAuthenticationSources,
+    ) -> Res {
+        self.update_user(id, |mut user| {
+            user.allow_local_login = sources.local;
+            user.allow_login_from_providers = sources.upstream;
+            user
+        })
+    }
+
     fn set_granted_2fa_clients(&mut self, id: &UserID, clients: GrantedClients) -> Res {
         self.update_user(id, |mut user| {
             user.authorized_clients = clients.to_user();