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(PHP Extension) Verify a JWT Created by the Amazon Cognito ServiceDemonstrates how to verify a JWT created by the Amazon Cognito Service.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // 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: $http = new CkHttp(); $sbJsonKeys = new CkStringBuilder(); $success = $http->QuickGetSb('https://cognito-idp.us-east-2.amazonaws.com/us-east-2_******/.well-known/jwks.json',$sbJsonKeys); if ($success == false) { print $http->lastErrorText() . "\n"; exit; } $jsonKeys = new CkJsonObject(); $jsonKeys->LoadSb($sbJsonKeys); $jsonKeys->put_EmitCompact(false); print $jsonKeys->emit() . "\n"; // 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. // jsonKey1 is a CkJsonObject $jsonKey1 = $jsonKeys->ObjectOf('keys[0]'); if ($jsonKeys->get_LastMethodSuccess() == false) { print 'Did not get the 1st JSON public key.' . "\n"; exit; } $pubKey1 = new CkPublicKey(); $success = $pubKey1->LoadFromString($jsonKey1->emit()); if ($success == false) { print $pubKey1->lastErrorText() . "\n"; exit; } print 'Success' . "\n"; $jwt = new CkJwt(); // I did not include the an actual AWS Cognito token here because our test sample used customer-provided data.. $token = 'eyJ..asXg'; // First verify the signature. $sigVerified = $jwt->VerifyJwtPk($token,$pubKey1); print 'verified: ' . $sigVerified . "\n"; // 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. $leeway = 60; $bTimeValid = $jwt->IsTimeValid($token,$leeway); print 'time constraints valid: ' . $bTimeValid . "\n"; // Now let's recover the original claims JSON (the payload). $payload = $jwt->getPayload($token); // The payload will likely be in compact form: print $payload . "\n"; // We can format for human viewing by loading it into Chilkat's JSON object // and emit. $json = new CkJsonObject(); $success = $json->Load($payload); $json->put_EmitCompact(false); print $json->emit() . "\n"; // We can recover the original JOSE header in the same way: $joseHeader = $jwt->getHeader($token); // The payload will likely be in compact form: print $joseHeader . "\n"; // We can format for human viewing by loading it into Chilkat's JSON object // and emit. $success = $json->Load($joseHeader); $json->put_EmitCompact(false); print $json->emit() . "\n"; ?> |
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