Pascal (Lazarus/Delphi)

Download Google OAuth2 Certs (JWK) and Load into Chilkat PublicKey Objects

See more OAuth2 Examples

Demonstrates how to download the JWK from https://www.googleapis.com/oauth2/v3/certs and load the public keys into Chilkat public key objects. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.PublicKey,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  jwkStr: string;
  json: TJsonObject;
  jsonKey: TJsonObject;
  pubKey: TPublicKey;
  numKeys: Integer;
  i: Integer;

begin
  success := False;

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

  http := THttp.Create;

  jwkStr := http.QuickGetStr('https://www.googleapis.com/oauth2/v3/certs');
  if (http.LastMethodSuccess = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  We have the following:

  //      {
  //        "keys": [
  //  	{
  //  	  "kid": "e8732db06287515556213b80acbcfd08cfb302a9",
  //  	  "n": "4RIrO30287Wsq3gqXCMkUYMVAeI3H8...w2mbMNEBQ",
  //  	  "kty": "RSA",
  //  	  "e": "AQAB",
  //  	  "alg": "RS256",
  //  	  "use": "sig"
  //  	},
  //  	{
  //  	  "kid": "8462a71da4f6d611fc0fecf0fc4ba9c37d65e6cd",
  //  	  "e": "AQAB",
  //  	  "n": "xT_ngLZNmT5GBtJZeTB...Ft4gK0eoFi0d3l8bcw",
  //  	  "alg": "RS256",
  //  	  "use": "sig",
  //  	  "kty": "RSA"
  //  	}
  //        ]
  //      }

  json := TJsonObject.Create;
  success := json.Load(jwkStr);

  jsonKey := TJsonObject.Create;
  pubKey := TPublicKey.Create;
  numKeys := json.SizeOfArray('keys');
  i := 0;
  while i < numKeys do
    begin
      json.I := i;

      json.ObjectOf2('keys[i]',jsonKey);

      success := pubKey.LoadFromString(jsonKey.Emit());
      if (success = False) then
        begin
          WriteLn(pubKey.LastErrorText);
          Exit;
        end;

      WriteLn(i);
      WriteLn(pubKey.GetPem(True));
      i := i + 1;
    end;

  WriteLn('Success.');

  //  Sample output:

  //  0
  //  -----BEGIN RSA PUBLIC KEY-----
  //  MIIBCgKCAQEA4RIrO30287Wsq3gqXCMkUYMVAeI3H8LVE6IXR1krdFeGnZLiGUPw
  //  cbkeVpXf3lmJdsStOg+jijces2DZCfPyIBiQuLYfxxmAZE6ErJ0QJFg1stwli2Pz
  //  9ncYhFoqi8pXr7kEzEJBTzX4thuw56ydbGsshSEznPXoerCJOc7UI2+n0wFCWQ4Y
  //  LHbh/PrWt4vdadyUUUW/QpQHXQLdD8q/Qwqdj0O9zlJE7R6Elw2E9EqnHyIGu1hm
  //  LxhqrTru1M18SUhONYbVskV/BCEdVKs//X96849HorWQDCAgVMWfGsdMVq55FAdJ
  //  680N5UmQDRynIZ4+PeNGN4S9iw2mbMNEBQIDAQAB
  //  -----END RSA PUBLIC KEY-----
  //  
  //  1
  //  -----BEGIN RSA PUBLIC KEY-----
  //  MIIBCgKCAQEAxT/ngLZNmT5GBdkLtJZjNeTB+8B5yWgrq/e5eMZ1hrZhcmLK+dSn
  //  IkpOPV8/OekV67EnQ7I4II2rcNJnHGrGKZziXO3XN2gtUHE+mBJC99oULSbX/QwB
  //  Kz7gC/IBPq9EuxTt6Oq6fPkVQ9DbRIgWJSEGBF/KRaNl3kyAlIZfpY7XgHyJTTv8
  //  E7yAcYKPR+36gzdl+ps0sDLKzUuAtZNq8llK0u80z6AtAUIYwWdkEhM9upy6keKI
  //  TasIxcsO7M6kZPINUSbh6t5VAm8FuqRmxpgg+9c9/GQSGd89InVypoVzWLQ+wOGg
  //  5G4H6JqIgtj0TRFt4gK0eoFi2U0d3l8bcwIDAQAB
  //  -----END RSA PUBLIC KEY-----
  //  
  //  Success.


  http.Free;
  json.Free;
  jsonKey.Free;
  pubKey.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.