Add authentication from upstream providers (#107)

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

Reviewed-on: #107

src/data/app_config.rs

@@ -2,7 +2,9 @@ use std::path::{Path, PathBuf};
 
 use clap::Parser;
 
-use crate::constants::{APP_NAME, CLIENTS_LIST_FILE, USERS_LIST_FILE};
+use crate::constants::{
+    APP_NAME, CLIENTS_LIST_FILE, OIDC_PROVIDER_CB_URI, PROVIDERS_LIST_FILE, USERS_LIST_FILE,
+};
 
 /// Basic OIDC provider
 #[derive(Parser, Debug, Clone)]
@@ -72,6 +74,10 @@ impl AppConfig {
         self.storage_path().join(CLIENTS_LIST_FILE)
     }
 
+    pub fn providers_file(&self) -> PathBuf {
+        self.storage_path().join(PROVIDERS_LIST_FILE)
+    }
+
     pub fn full_url(&self, uri: &str) -> String {
         if uri.starts_with('/') {
             format!("{}{}", self.website_origin, uri)
@@ -80,9 +86,21 @@ impl AppConfig {
         }
     }
 
+    /// Get the URL where a upstream OpenID provider should redirect
+    /// the user after an authentication
+    pub fn oidc_provider_redirect_url(&self) -> String {
+        AppConfig::get().full_url(OIDC_PROVIDER_CB_URI)
+    }
+
     pub fn domain_name(&self) -> &str {
         self.website_origin.split('/').nth(2).unwrap_or(APP_NAME)
     }
+
+    /// Get the domain without the port
+    pub fn domain_name_without_port(&self) -> &str {
+        let domain = self.domain_name();
+        domain.split_once(':').map(|i| i.0).unwrap_or(domain)
+    }
 }
 
 #[cfg(test)]