Add auth config

src/config.rs

@@ -1,3 +1,4 @@
+use rustical_auth::{AuthProvider, HtpasswdAuthConfig};
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Deserialize, Serialize)]
@@ -11,7 +12,26 @@ pub enum CalendarStoreConfig {
     Toml(TomlCalendarStoreConfig),
 }
 
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(tag = "backend", rename_all = "snake_case")]
+pub enum AuthConfig {
+    Htpasswd(HtpasswdAuthConfig),
+    None,
+}
+
+impl From<AuthConfig> for AuthProvider {
+    fn from(value: AuthConfig) -> Self {
+        match value {
+            AuthConfig::Htpasswd(config) => {
+                Self::Htpasswd(rustical_auth::htpasswd::HtpasswdAuth { config })
+            }
+            AuthConfig::None => Self::None(rustical_auth::none::NoneAuth),
+        }
+    }
+}
+
 #[derive(Debug, Deserialize, Serialize)]
 pub struct Config {
     pub calendar_store: CalendarStoreConfig,
+    pub auth: AuthConfig,
 }