Rust Requires Chilkat v11.0.0+

Verify a JWT Created by the Amazon Cognito Service

See more JSON Web Token (JWT) Examples

Demonstrates how to verify a JWT created by the Amazon Cognito Service. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The public keys for this example are at https://cognito-idp.us-east-2.amazonaws.com/us-east-2_******/.well-known/jwks.json
// Let's get them:

let http = chilkat::Http::new();
let sb_json_keys = chilkat::StringBuilder::new();
if http.quick_get_sb("https://cognito-idp.us-east-2.amazonaws.com/us-east-2_******/.well-known/jwks.json", &sb_json_keys).is_err() {
    println!("{}", http.last_error_text());
    return;
}

let json_keys = chilkat::JsonObject::new();
let _ = json_keys.load_sb(&sb_json_keys);
json_keys.set_emit_compact(false);
println!("{}", json_keys.emit().unwrap_or_default());

// Here are the keys:

// {
//   "keys": [
//     {
//       "alg": "RS256",
//       "e": "AQAB",
//       "kid": "1A/L5Fsb2EsEwxy5E0cmCMS1BnMe6Jl6NXiMig4iNwU=",
//       "kty": "RSA",
//       "n": "y0w7BJrIJYi ... jKG27z2P3OKw",
//       "use": "sig"
//     },
//     {
//       "alg": "RS256",
//       "e": "AQAB",
//       "kid": "mos6VTJnvDwurY3ghJg6IAPUq+dMwl6CL/iThzJOkzg=",
//       "kty": "RSA",
//       "n": "qbIEH-7tg6yrT ... 3Fj94ooTd0w",
//       "use": "sig"
//     }
//   ]
// }

// Try the 1st key.
let json_key1 = chilkat::JsonObject::new();
let _ = json_keys.object_of2("keys[0]", &json_key1);

let pub_key1 = chilkat::PublicKey::new();
if pub_key1.load_from_string(&json_key1.emit().unwrap_or_default()).is_err() {
    println!("{}", pub_key1.last_error_text());
    return;
}

println!("Success");

let jwt = chilkat::Jwt::new();

// I did not include the an actual AWS Cognito token here because our test sample used customer-provided data..
let token = "eyJ..asXg".to_string();

// First verify the signature.
let sig_verified = jwt.verify_jwt_pk(&token, &pub_key1).is_ok();
println!("verified: {}", sig_verified);

// Let's see if the time constraints, if any, are valid.
// The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
// If the current system time is before the "nbf" time, or after the "exp" time,
// then IsTimeValid will return false/0.
// Also, we'll allow a leeway of 60 seconds to account for any clock skew.
// Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
let leeway = 60;
let b_time_valid = jwt.is_time_valid(&token, leeway);
println!("time constraints valid: {}", b_time_valid);

// Now let's recover the original claims JSON (the payload).
let payload = jwt.get_payload(&token).unwrap_or_default();
// The payload will likely be in compact form:
println!("{}", payload);

// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
let json = chilkat::JsonObject::new();
let _ = json.load(&payload).is_ok();
json.set_emit_compact(false);
println!("{}", json.emit().unwrap_or_default());

// We can recover the original JOSE header in the same way:
let jose_header = jwt.get_header(&token).unwrap_or_default();
// The payload will likely be in compact form:
println!("{}", jose_header);

// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
let _ = json.load(&jose_header).is_ok();
json.set_emit_compact(false);
println!("{}", json.emit().unwrap_or_default());