chore: migrate authifier into codebase (#658)

Co-authored-by: izzy <me@insrt.uk>
Signed-off-by: Zomatree <me@zomatree.live>
Signed-off-by: izzy <me@insrt.uk>

crates/core/database/src/util/captcha.rs

@@ -0,0 +1,42 @@
+use reqwest::Client;
+use revolt_config::config;
+use revolt_result::Result;
+use std::sync::LazyLock;
+
+static CLIENT: LazyLock<Client> = LazyLock::new(Client::new);
+
+#[derive(Serialize, Deserialize)]
+struct CaptchaResponse {
+    success: bool,
+}
+
+pub async fn check_captcha(token: Option<&str>) -> Result<()> {
+    let config = config().await;
+
+    if !config.api.security.captcha.hcaptcha_key.is_empty() {
+        let Some(token) = token else {
+            return Err(create_error!(CaptchaFailed));
+        };
+
+        let response = CLIENT
+            .post("https://hcaptcha.com/siteverify")
+            .form(&[
+                ("secret", config.api.security.captcha.hcaptcha_key.as_str()),
+                ("response", token),
+            ])
+            .send()
+            .await
+            .map_err(|_| create_error!(CaptchaFailed))?
+            .json::<CaptchaResponse>()
+            .await
+            .map_err(|_| create_error!(CaptchaFailed))?;
+
+        if response.success {
+            Ok(())
+        } else {
+            Err(create_error!(CaptchaFailed))
+        }
+    } else {
+        Ok(())
+    }
+}