"Expires":        "60",
				"Signature":      "badsignature",
				"AWSAccessKeyId": "Z7IXGOO6BZ0REAN1Q26I",
			},
			expected: ErrInvalidAccessKeyID,
		},
		// (2) Should error with malformed expires.
		{
			queryParams: map[string]string{
				"Expires":        "60s",
				"Signature":      "badsignature",
				"AWSAccessKeyId": accessKey,
			},
			expected: ErrMalformedExpires,
		},

	// Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature
	authFields := strings.Split(r.Header.Get(xhttp.Authorization), " ")
	if len(authFields) != 2 {
		return auth.Credentials{}, false, ErrMissingFields
	}

	// Then will be splitting on ":", this will separate `AWSAccessKeyId` and `Signature` string.
	keySignFields := strings.Split(strings.TrimSpace(authFields[1]), ":")

	testCases := []struct {
		inputQueryKey   string
		inputQueryValue string
		expectedResult  bool
	}{
		// Test case - 1.
		// Test case with query key "AWSAccessKeyId" set.
		{"", "", false},
		// Test case - 2.
		{"AWSAccessKeyId", "", true},
		// Test case - 3.
		{"X-Amz-Content-Sha256", "", false},
	}

	for i, testCase := range testCases {
		// creating an input HTTP request.

	AmzEncryptionAES = "AES256"
	AmzEncryptionKMS = "aws:kms"

	// Signature v2 related constants
	AmzSignatureV2 = "Signature"
	AmzAccessKeyID = "AWSAccessKeyId"

	// Response request id.
	AmzRequestID     = "x-amz-request-id"
	AmzRequestHostID = "x-amz-id-2"

	// Deployment id.
	MinioDeploymentID = "x-minio-deployment-id"

	// Peer call

	formData := map[string]string{
		"AWSAccessKeyId":              accessKey,
		"bucket":                      bucketName,
		"key":                         objectName + "/${filename}",
		"policy":                      encodedPolicy,
		"signature":                   signature,
		"X-Amz-Ignore-AWSAccessKeyId": "",
	}

	// Create the multipart form.
	var buf bytes.Buffer

	// Construct the final presigned URL.
	return nil
}

// preSignV2 - presign the request in following style.
// https://${S3_BUCKET}.s3.amazonaws.com/${S3_OBJECT}?AWSAccessKeyId=${S3_ACCESS_KEY}&Expires=${TIMESTAMP}&Signature=${SIGNATURE}.
func preSignV2(req *http.Request, accessKeyID, secretAccessKey string, expires int64) error {
	// Presign is not needed for anonymous credentials.