Implement TryFrom &Jwk for DecodingKey (#437)

Author: tottoto

examples/auth0.rs

@@ -2,7 +2,7 @@
 use std::collections::HashMap;
 
 use jsonwebtoken::jwk::JwkSet;
-use jsonwebtoken::{DecodingKey, Validation, decode, decode_header};
+use jsonwebtoken::{Validation, decode, decode_header};
 
 const TOKEN: &str = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IjFaNTdkX2k3VEU2S1RZNTdwS3pEeSJ9.eyJpc3MiOiJodHRwczovL2Rldi1kdXp5YXlrNC5ldS5hdXRoMC5jb20vIiwic3ViIjoiNDNxbW44c281R3VFU0U1N0Fkb3BhN09jYTZXeVNidmRAY2xpZW50cyIsImF1ZCI6Imh0dHBzOi8vZGV2LWR1enlheWs0LmV1LmF1dGgwLmNvbS9hcGkvdjIvIiwiaWF0IjoxNjIzNTg1MzAxLCJleHAiOjE2MjM2NzE3MDEsImF6cCI6IjQzcW1uOHNvNUd1RVNFNTdBZG9wYTdPY2E2V3lTYnZkIiwic2NvcGUiOiJyZWFkOnVzZXJzIiwiZ3R5IjoiY2xpZW50LWNyZWRlbnRpYWxzIn0.0MpewU1GgvRqn4F8fK_-Eu70cUgWA5JJrdbJhkCPCxXP-8WwfI-qx1ZQg2a7nbjXICYAEl-Z6z4opgy-H5fn35wGP0wywDqZpqL35IPqx6d0wRvpPMjJM75zVXuIjk7cEhDr2kaf1LOY9auWUwGzPiDB_wM-R0uvUMeRPMfrHaVN73xhAuQWVjCRBHvNscYS5-i6qBQKDMsql87dwR72DgHzMlaC8NnaGREBC-xiSamesqhKPVyGzSkFSaF3ZKpGrSDapqmHkNW9RDBE3GQ9OHM33vzUdVKOjU1g9Leb9PDt0o1U4p3NQoGJPShQ6zgWSUEaqvUZTfkbpD_DoYDRxA";
 const JWKS_REPLY: &str = r#"
@@ -21,8 +21,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         return Err("No matching JWK found for the given kid".into());
     };
 
-    let decoding_key = DecodingKey::from_jwk(jwk)?;
-
     let validation = {
         let mut validation = Validation::new(header.alg);
         validation.set_audience(&["https://dev-duzyayk4.eu.auth0.com/api/v2/"]);
@@ -31,7 +29,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     };
 
     let decoded_token =
-        decode::<HashMap<String, serde_json::Value>>(TOKEN, &decoding_key, &validation)?;
+        decode::<HashMap<String, serde_json::Value>>(TOKEN, &jwk.try_into()?, &validation)?;
 
     println!("{:#?}", decoded_token);
 

src/decoding.rs

@@ -251,6 +251,14 @@ impl DecodingKey {
     }
 }
 
+impl TryFrom<&Jwk> for DecodingKey {
+    type Error = crate::errors::Error;
+
+    fn try_from(jwk: &Jwk) -> Result<Self> {
+        Self::from_jwk(jwk)
+    }
+}
+
 /// Decode and validate a JWT
 ///
 /// If the token or its signature is invalid or the claims fail validation, it will return an error.