Implemented multiple U2f keys, key names, and compromised checks

src/api/mod.rs

@@ -47,10 +47,13 @@ impl NumberOrString {
         }
     }
 
-    fn into_i32(self) -> Option<i32> {
+    fn into_i32(self) -> ApiResult<i32> {
+        use std::num::ParseIntError as PIE;
         match self {
-            NumberOrString::Number(n) => Some(n),
-            NumberOrString::String(s) => s.parse().ok(),
+            NumberOrString::Number(n) => Ok(n),
+            NumberOrString::String(s) => s
+                .parse()
+                .map_err(|e: PIE| crate::Error::new("Can't convert to number", e.to_string())),
         }
     }
 }