Merge pull request #7 from naokiri/#6-implement-standard-error

Issue#6 Implement standard error

examples/simple.rs

@@ -1,26 +1,19 @@
-use jwks_client::error::Error;
 use jwks_client::keyset::KeyStore;
 
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let jkws_url = "https://raw.githubusercontent.com/jfbilodeau/jwks-client/0.1.8/test/test-jwks.json";
 
     let key_set = KeyStore::new_from(jkws_url).await.unwrap();
 
     // ...
 
     let token = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IjEifQ.eyJuYW1lIjoiQWRhIExvdmVsYWNlIiwiaXNzIjoiaHR0cHM6Ly9jaHJvbm9nZWFycy5jb20vdGVzdCIsImF1ZCI6InRlc3QiLCJhdXRoX3RpbWUiOjEwMCwidXNlcl9pZCI6InVpZDEyMyIsInN1YiI6InNidTEyMyIsImlhdCI6MjAwLCJleHAiOjUwMCwibmJmIjozMDAsImVtYWlsIjoiYWxvdmVsYWNlQGNocm9ub2dlYXJzLmNvbSJ9.eTQnwXrri_uY55fS4IygseBzzbosDM1hP153EZXzNlLH5s29kdlGt2mL_KIjYmQa8hmptt9RwKJHBtw6l4KFHvIcuif86Ix-iI2fCpqNnKyGZfgERV51NXk1THkgWj0GQB6X5cvOoFIdHa9XvgPl_rVmzXSUYDgkhd2t01FOjQeeT6OL2d9KdlQHJqAsvvKVc3wnaYYoSqv2z0IluvK93Tk1dUBU2yWXH34nX3GAVGvIoFoNRiiFfZwFlnz78G0b2fQV7B5g5F8XlNRdD1xmVZXU8X2-xh9LqRpnEakdhecciFHg0u6AyC4c00rlo_HBb69wlXajQ3R4y26Kpxn7HA";
+    let jwt = key_set.verify(token)?;
+    let issuer = jwt.payload().iss().unwrap();
+    let name = jwt.payload().get_str("name").unwrap();
 
-    match key_set.verify(token) {
-        Ok(jwt) => {
-            let issuer = jwt.payload().iss().unwrap();
-            let name = jwt.payload().get_str("name").unwrap();
-
-            println!("iss={}", issuer);
-            println!("name={}", name);
-        }
-        Err(Error { msg, typ: _ }) => {
-            eprintln!("Could not verify token. Reason: {}", msg);
-        }
-    }
+    println!("iss={}", issuer);
+    println!("name={}", name);
+    Ok(())
 }

src/error.rs

@@ -1,10 +1,22 @@
+use std::fmt::{Display, Formatter};
+use std::fmt;
+
 #[derive(Debug, PartialEq)]
 pub struct Error {
     /// Debug message associated with error
     pub msg: &'static str,
     pub typ: Type,
 }
 
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}: {}", self.typ, self.msg)
+    }
+}
+
+impl std::error::Error for Error {
+}
+
 /// Type of error encountered
 #[derive(Debug, PartialEq)]
 pub enum Type {