add umbrella crate

captcha/src/lib.rs

@@ -0,0 +1,32 @@
+use eva::fut::Fut;
+
+use viendesu_core::{
+    bail,
+    types::captcha::Token,
+    world::{World, WorldMut},
+};
+
+use self::error::CaptchaResult;
+
+pub mod error;
+
+pub trait Service: Send + Sync {
+    fn verify<W: WorldMut>(
+        &self,
+        w: World<W>,
+        token: &Token,
+    ) -> impl Fut<Output = CaptchaResult<()>>;
+}
+
+impl Service for bool {
+    async fn verify<W: WorldMut>(&self, w: World<W>, token: &Token) -> CaptchaResult<()> {
+        _ = w;
+        _ = token;
+
+        if *self {
+            Ok(())
+        } else {
+            bail!("invalid captcha")
+        }
+    }
+}