req, err := newTestRequest(http.MethodPost, resource, 0, nil)
	if err != nil {
		return nil, err
	}

	// management REST API uses signature V4 for authentication.
	err = signRequestV4(req, cred.AccessKey, cred.SecretKey)
	if err != nil {
		return nil, err
	}
	return req, nil
}

	// can reach that size according to https://aws.amazon.com/articles/1434
	maxFormFieldSize = int64(1 * humanize.MiByte)

	// The maximum allowed time difference between the incoming request
	// date and server date during signature verification.
	globalMaxSkewTime = 15 * time.Minute // 15 minutes skew allowed.

	// GlobalStaleUploadsExpiry - Expiry duration after which the uploads in multipart,
	// tmp directory are deemed stale.

			return
		}
	}

	// Verify policy signature.
	cred, errCode := doesPolicySignatureMatch(formValues)
	if errCode != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(errCode), r.URL)
		return
	}

	if len(fanOutEntries) > 0 {
		// Once signature is validated, check if the user has
		// explicit permissions for the user.

2. The id_token self-contains the authorization information in a manner that can be verified. For example, by encoding authorization information along with a signature into the token.

WSO2 generates tokens in first style by default, but if to be used with MinIO we should configure WSO2 to provide JWT tokens instead.

### 3. Generate Self-contained Access Tokens

	suite.TearDownSuite(c)
}

func TestServerSuite(t *testing.T) {
	testCases := []*TestSuiteCommon{
		// Init and run test on ErasureSD backend with signature v4.
		{serverType: "ErasureSD", signer: signerV4},
		// Init and run test on ErasureSD backend with signature v2.
		{serverType: "ErasureSD", signer: signerV2},
		// Init and run test on ErasureSD backend, with tls enabled.

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMissingSignTag: {
		Code:           "AccessDenied",
		Description:    "Signature header missing Signature field.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMissingSignHeadersTag: {
		Code:           "InvalidArgument",
		Description:    "Signature header missing SignedHeaders field.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMalformedExpires: {

func (r *Config) PopulatePublicKey(arn arn.ARN) error {
	pCfg := r.arnProviderCfgsMap[arn]
	if pCfg.JWKS.URL == nil || pCfg.JWKS.URL.String() == "" {
		return nil
	}

	// Add client secret for the client ID for HMAC based signature.
	r.pubKeys.add(pCfg.ClientID, []byte(pCfg.ClientSecret))

	client := &http.Client{
		Transport: r.transport,
	}

	resp, err := client.Get(pCfg.JWKS.URL.String())
	if err != nil {
		return err
	}

        concreteResponse.error();
        assertTrue(concreteResponse.isError());
        assertEquals(0xC0000001, concreteResponse.getErrorCode());

        // Test signature verification
        assertTrue(concreteResponse.verifySignature(new byte[100], 0, 50));
        assertFalse(concreteResponse.isVerifyFailed());

        // Test exception handling

   * returned list. Unlike {@link Arrays#asList}, the returned list is unmodifiable.
   *
   * <p>This is useful when a varargs method needs to use a signature such as {@code (Foo firstFoo,
   * Foo... moreFoos)}, in order to avoid overload ambiguity or to enforce a minimum argument count.
   *
   * <p>The returned list is serializable and implements {@link RandomAccess}.
   *

// SignatureDoesNotMatch - when content md5 does not match with what was sent from client.
type SignatureDoesNotMatch struct{}

func (e SignatureDoesNotMatch) Error() string {
	return "The request signature we calculated does not match the signature you provided. Check your key and signing method."
}

// StorageFull storage ran out of space.
type StorageFull struct{}

func (e StorageFull) Error() string {