feat(auth): add Secure flag to session cookie via COOKIE_SECURE env

src/api/auth.rs

@@ -229,10 +229,7 @@ pub async fn login(username: String, password: String) -> Result<AuthResponse, S
         .await
         .map_err(AppError::query)?;
 
-    let cookie = format!(
-        "session={token}; HttpOnly; Path=/; Max-Age={}; SameSite=Lax",
-        30 * 24 * 60 * 60
-    );
+    let cookie = session::session_cookie(&token, 30 * 24 * 60 * 60, session::cookie_secure());
     if let Some(ctx) = dioxus::fullstack::FullstackContext::current() {
         if let Ok(value) = HeaderValue::try_from(cookie.as_str()) {
             ctx.add_response_header(SET_COOKIE, value);
@@ -252,11 +249,11 @@ pub async fn logout() -> Result<AuthResponse, ServerFnError> {
 
     let client = get_conn().await.map_err(AppError::db_conn)?;
 
+    let cookie = session::session_cookie("", 0, session::cookie_secure());
     if let Some(ctx) = dioxus::fullstack::FullstackContext::current() {
-        ctx.add_response_header(
-            SET_COOKIE,
-            HeaderValue::from_static("session=; HttpOnly; Path=/; Max-Age=0; SameSite=Lax"),
-        );
+        if let Ok(value) = HeaderValue::try_from(cookie.as_str()) {
+            ctx.add_response_header(SET_COOKIE, value);
+        }
     }
 
     if let Some(t) = token {

src/auth/session.rs

@@ -19,6 +19,22 @@ pub fn default_expiry() -> DateTime<Utc> {
     Utc::now() + Duration::days(30)
 }
 
+#[cfg(feature = "server")]
+pub fn cookie_secure() -> bool {
+    std::env::var("COOKIE_SECURE")
+        .ok()
+        .map(|v| matches!(v.as_str(), "1" | "true" | "yes"))
+        .unwrap_or(false)
+}
+
+#[cfg(feature = "server")]
+pub fn session_cookie(token: &str, max_age_seconds: i32, secure: bool) -> String {
+    let secure_flag = if secure { "; Secure" } else { "" };
+    format!(
+        "session={token}; HttpOnly; Path=/; Max-Age={max_age_seconds}; SameSite=Lax{secure_flag}"
+    )
+}
+
 #[cfg(feature = "server")]
 pub fn parse_session_token(cookie_header: &str) -> Option<&str> {
     cookie_header.split(';').map(|s| s.trim()).find_map(|pair| {
@@ -132,4 +148,25 @@ mod tests {
         let expected = sha2::Sha256::digest(b"hello");
         assert_eq!(hash, hex::encode(expected));
     }
+
+    #[test]
+    fn session_cookie_without_secure() {
+        let cookie = session_cookie("abc", 3600, false);
+        assert!(cookie.contains("session=abc"));
+        assert!(cookie.contains("HttpOnly"));
+        assert!(cookie.contains("SameSite=Lax"));
+        assert!(!cookie.contains("Secure"));
+    }
+
+    #[test]
+    fn session_cookie_with_secure() {
+        let cookie = session_cookie("abc", 3600, true);
+        assert!(cookie.contains("Secure"));
+    }
+
+    #[test]
+    fn session_cookie_logout_has_zero_max_age() {
+        let cookie = session_cookie("", 0, false);
+        assert!(cookie.contains("Max-Age=0"));
+    }
 }