feat: implement file upload functionality

src/pages/api/tokens.rs

@@ -0,0 +1,50 @@
+#[cfg(feature = "ssr")]
+use jsonwebtoken::{jwk::JwkSet, DecodingKey};
+use leptos::prelude::*;
+use crate::common::UserClaims;
+
+#[cfg(feature = "ssr")]
+pub async fn fetch_jwks(user_pool_id: String, region: String) -> Result<JwkSet, ServerFnError> {
+    let request_url = format!(
+        "https://cognito-idp.{}.amazonaws.com/{}/.well-known/jwks.json",
+        region,
+        user_pool_id
+    );
+
+    let jwks = reqwest::get(&request_url).await?
+        .json::<JwkSet>()
+        .await?;
+
+    Ok(jwks)
+}
+
+/// Validates a JWT, and, if successful, decodes it into a series of user claims.
+#[cfg(feature = "ssr")]
+pub async fn validate_and_get_token_info(token: String) -> Result<UserClaims, ServerFnError> {
+    use jsonwebtoken::{decode, Algorithm, Validation};
+
+    let jwks = fetch_jwks("us-east-1_Lfjuy5zaM".into(), "us-east-1".into()).await?;
+
+    let validation = Validation::new(Algorithm::RS256);
+    // validation.set_audience(&["scholarships-rs"]);
+
+    let header = jsonwebtoken::decode_header(&token)
+        .map_err(|e| ServerFnError::new(format!("Invalid token header: {e}")))?;
+
+    let kid = header.kid.ok_or_else(|| ServerFnError::new("Missing kid header"))?;
+
+    let jwk = jwks.find(&kid)
+        .ok_or_else(|| ServerFnError::new("Couldn't find matching key in JWKS"))?;
+
+    let token_data = decode::<UserClaims>(
+        &token,
+        &DecodingKey::from_jwk(&jwk)?,
+        &validation
+    ).map_err(|_| ServerFnError::new("Invalid token found".to_string()))?;
+
+    if token_data.claims.token_use != "access" {
+        return Err(ServerFnError::new("Token type mismatch"));
+    }
+
+    Ok(token_data.claims)
+}