Refactor auth0 example (#367)

Author: tottoto

examples/auth0.rs

@@ -1,44 +1,42 @@
 /// Example for the backend to backend implementation
 use std::collections::HashMap;
-use std::str::FromStr;
 
-use jsonwebtoken::jwk::AlgorithmParameters;
-use jsonwebtoken::{decode, decode_header, jwk, Algorithm, DecodingKey, Validation};
+use jsonwebtoken::jwk::{AlgorithmParameters, JwkSet};
+use jsonwebtoken::{decode, decode_header, DecodingKey, Validation};
 
 const TOKEN: &str = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IjFaNTdkX2k3VEU2S1RZNTdwS3pEeSJ9.eyJpc3MiOiJodHRwczovL2Rldi1kdXp5YXlrNC5ldS5hdXRoMC5jb20vIiwic3ViIjoiNDNxbW44c281R3VFU0U1N0Fkb3BhN09jYTZXeVNidmRAY2xpZW50cyIsImF1ZCI6Imh0dHBzOi8vZGV2LWR1enlheWs0LmV1LmF1dGgwLmNvbS9hcGkvdjIvIiwiaWF0IjoxNjIzNTg1MzAxLCJleHAiOjE2MjM2NzE3MDEsImF6cCI6IjQzcW1uOHNvNUd1RVNFNTdBZG9wYTdPY2E2V3lTYnZkIiwic2NvcGUiOiJyZWFkOnVzZXJzIiwiZ3R5IjoiY2xpZW50LWNyZWRlbnRpYWxzIn0.0MpewU1GgvRqn4F8fK_-Eu70cUgWA5JJrdbJhkCPCxXP-8WwfI-qx1ZQg2a7nbjXICYAEl-Z6z4opgy-H5fn35wGP0wywDqZpqL35IPqx6d0wRvpPMjJM75zVXuIjk7cEhDr2kaf1LOY9auWUwGzPiDB_wM-R0uvUMeRPMfrHaVN73xhAuQWVjCRBHvNscYS5-i6qBQKDMsql87dwR72DgHzMlaC8NnaGREBC-xiSamesqhKPVyGzSkFSaF3ZKpGrSDapqmHkNW9RDBE3GQ9OHM33vzUdVKOjU1g9Leb9PDt0o1U4p3NQoGJPShQ6zgWSUEaqvUZTfkbpD_DoYDRxA";
 const JWKS_REPLY: &str = r#"
 {"keys":[{"alg":"RS256","kty":"RSA","use":"sig","n":"2V31IZF-EY2GxXQPI5OaEE--sezizPamNZDW9AjBE2cCErfufM312nT2jUsCnfjsXnh6Z_b-ncOMr97zIZkq1ofU7avemv8nX7NpKmoPBpVrMPprOax2-e3wt-bSfFLIHyghjFLKpkT0LOL_Fimi7xY-J86R06WHojLo3yGzAgQCswZmD4CFf6NcBWDcb6l6kx5vk_AdzHIkVEZH4aikUL_fn3zq5qbE25oOg6pT7F7Pp4zdHOAEKnIRS8tvP8tvvVRkUCrjBxz_Kx6Ne1YOD-fkIMRk_MgIWeKZZzZOYx4VrC0vqYiM-PcKWbNdt1kNoTHOeL06XZeSE6WPZ3VB1Q","e":"AQAB","kid":"1Z57d_i7TE6KTY57pKzDy","x5t":"1gA-aTE9VglLXZnrqvzwWhHsFdk","x5c":["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"]},{"alg":"RS256","kty":"RSA","use":"sig","n":"0KDpAuJZyDwPg9CfKi0R3QwDROyH0rvd39lmAoqQNqtYPghDToxFMDLpul0QHttbofHPJMKrPfeEFEOvw7KJgelCHZmckVKaz0e4tfu_2Uvw2kFljCmJGfspUU3mXxLyEea9Ef9JqUru6L8f_0_JIDMT3dceqU5ZqbG8u6-HRgRQ5Jqc_fF29Xyw3gxNP_Q46nsp_0yE68UZE1iPy1om0mpu8mpsY1-Nbvm51C8i4_tFQHdUXbhF4cjAoR0gZFNkzr7FCrL4On0hKeLcvxIHD17SxaBsTuCBGd35g7TmXsA4hSimD9taRHA-SkXh558JG5dr-YV9x80qjeSAvTyjcQ","e":"AQAB","kid":"v2HFn4VqJB-U4vtQRJ3Ql","x5t":"AhUBZjtsFdx7C1PFtWAJ756bo5k","x5c":["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"]}]}
 "#;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let jwks: jwk::JwkSet = serde_json::from_str(JWKS_REPLY).unwrap();
+    let jwks: JwkSet = serde_json::from_str(JWKS_REPLY).unwrap();
+    let header = decode_header(TOKEN).unwrap();
 
-    let header = decode_header(TOKEN)?;
-    let kid = match header.kid {
-        Some(k) => k,
-        None => return Err("Token doesn't have a `kid` header field".into()),
+    let Some(kid) = header.kid else {
+        return Err("Token doesn't have a `kid` header field".into());
     };
-    if let Some(j) = jwks.find(&kid) {
-        match &j.algorithm {
-            AlgorithmParameters::RSA(rsa) => {
-                let decoding_key = DecodingKey::from_rsa_components(&rsa.n, &rsa.e).unwrap();
-
-                let mut validation = Validation::new(
-                    Algorithm::from_str(j.common.key_algorithm.unwrap().to_string().as_str())
-                        .unwrap(),
-                );
-                validation.set_audience(&["https://dev-duzyayk4.eu.auth0.com/api/v2/"]);
-                validation.validate_exp = false;
-                let decoded_token =
-                    decode::<HashMap<String, serde_json::Value>>(TOKEN, &decoding_key, &validation)
-                        .unwrap();
-                println!("{:?}", decoded_token);
-            }
-            _ => unreachable!("this should be a RSA"),
-        }
-    } else {
+
+    let Some(jwk) = jwks.find(&kid) else {
         return Err("No matching JWK found for the given kid".into());
-    }
+    };
+
+    let decoding_key = match &jwk.algorithm {
+        AlgorithmParameters::RSA(rsa) => DecodingKey::from_rsa_components(&rsa.n, &rsa.e)?,
+        _ => unreachable!("algorithm should be a RSA in this example"),
+    };
+
+    let validation = {
+        let mut validation = Validation::new(header.alg);
+        validation.set_audience(&["https://dev-duzyayk4.eu.auth0.com/api/v2/"]);
+        validation.validate_exp = false;
+        validation
+    };
+
+    let decoded_token =
+        decode::<HashMap<String, serde_json::Value>>(TOKEN, &decoding_key, &validation)?;
+
+    println!("{:#?}", decoded_token);
 
     Ok(())
 }