[OOM-K8S-CERT-EXTERNAL-PROVIDER] Add API exceptions handling

- Added handling exceptions from CertService API

Issue-ID: OOM-2559
Signed-off-by: Piotr Marcinkiewicz <piotr.marcinkiewicz@nokia.com>
Change-Id: I18f00fd7e17f96b2e73b81370b54fe33f10039c3

2 files changed, 41 insertions, 12 deletions

diff --git a/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client.go b/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client.go
index 15b90624..4806c4a1 100644
--- a/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client.go
+++ b/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client.go
@@ -29,7 +29,7 @@ import (
 
 const (
 	CsrHeaderName = "CSR"
-	PkHeaderName = "PK"
+	PkHeaderName  = "PK"
 )
 
 type CertServiceClient interface {
@@ -38,7 +38,7 @@ type CertServiceClient interface {
 }
 
 type CertServiceClientImpl struct {
-	healthUrl string
+	healthUrl        string
 	certificationUrl string
 	httpClient       HTTPClient
 }
@@ -52,6 +52,10 @@ type CertificatesResponse struct {
 	TrustedCertificates []string `json:"trustedCertificates"`
 }
 
+type ResponseException struct {
+	ErrorMessage string `json:"errorMessage"`
+}
+
 func (client *CertServiceClientImpl) CheckHealth() error {
 	request, err := http.NewRequest("GET", client.healthUrl, nil)
 	if err != nil {
@@ -63,14 +67,13 @@ func (client *CertServiceClientImpl) CheckHealth() error {
 		return err
 	}
 
-	if response.StatusCode != 200 {
+	if response.StatusCode != http.StatusOK {
 		return fmt.Errorf("health check retured status code [%d]", response.StatusCode)
 	}
 
 	return nil
 }
 
-
 func (client *CertServiceClientImpl) GetCertificates(csr []byte, key []byte) (*CertificatesResponse, error) {
 
 	request, err := http.NewRequest("GET", client.certificationUrl, nil)
@@ -85,6 +88,13 @@ func (client *CertServiceClientImpl) GetCertificates(csr []byte, key []byte) (*C
 		return nil, err
 	}
 
+	if response.StatusCode != http.StatusOK {
+		var responseException ResponseException
+		err = json.NewDecoder(response.Body).Decode(&responseException)
+		return nil, fmt.Errorf("CertService API returned status code [%d] and message [%s]",
+			response.StatusCode, responseException.ErrorMessage)
+	}
+
 	var certificatesResponse CertificatesResponse
 	err = json.NewDecoder(response.Body).Decode(&certificatesResponse)
 	if err != nil {
diff --git a/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client_test.go b/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client_test.go
index 06fc4792..f2b5032f 100644
--- a/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client_test.go
+++ b/certServiceK8sExternalProvider/src/certserviceclient/cert_service_client_test.go
@@ -23,6 +23,7 @@ package certserviceclient
 import (
 	"bytes"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"net/http"
 	"testing"
@@ -42,14 +43,7 @@ func Test_GetCertificates_shouldParseCertificateResponseCorrectly(t *testing.T)
 	responseJsonReader := ioutil.NopCloser(bytes.NewReader([]byte(responseJson)))
 	client := CertServiceClientImpl{
 		certificationUrl: certificationUrl,
-		httpClient:       &httpClientMock{
-			DoFunc: func(req *http.Request) (response *http.Response, e error) {
-				mockedResponse := &http.Response{
-					Body: responseJsonReader,
-				}
-				return mockedResponse, nil
-			},
-		},
+		httpClient:       getMockedClient(responseJsonReader, http.StatusOK),
 	}
 	response, _ := client.GetCertificates(testdata.CsrBytes, testdata.PkBytes)
 	assert.ElementsMatch(t, []string{"cert-0", "cert-1"}, response.CertificateChain)
@@ -91,6 +85,19 @@ func Test_GetCertificates_shouldReturnError_whenHttpClientReturnsError(t *testin
 	assert.Error(t, err)
 }
 
+func Test_GetCertificates_shouldReturnError_whenResponseOtherThan200(t *testing.T) {
+	responseJson := `{"errorMessage": "CertService API error"}`
+	responseJsonReader := ioutil.NopCloser(bytes.NewReader([]byte(responseJson)))
+	client := CertServiceClientImpl{
+		certificationUrl: certificationUrl,
+		httpClient:       getMockedClient(responseJsonReader, http.StatusNotFound),
+	}
+	response, err := client.GetCertificates(testdata.CsrBytes, testdata.PkBytes)
+
+	assert.Nil(t, response)
+	assert.Error(t, err)
+}
+
 func Test_CheckHealth_shouldReturnNil_whenHttpClientReturnsStatusCode200(t *testing.T) {
 	client := CertServiceClientImpl{
 		certificationUrl: certificationUrl,
@@ -143,6 +150,18 @@ func Test_CheckHealth_shouldReturnError_whenHttpClientReturnsError(t *testing.T)
 	assert.Error(t, err)
 }
 
+func getMockedClient(responseJsonReader io.ReadCloser, responseCode int) *httpClientMock {
+	return &httpClientMock{
+		DoFunc: func(req *http.Request) (response *http.Response, e error) {
+			mockedResponse := &http.Response{
+				Body:       responseJsonReader,
+				StatusCode: responseCode,
+			}
+			return mockedResponse, nil
+		},
+	}
+}
+
 type httpClientMock struct {
 	DoFunc func(*http.Request) (*http.Response, error)
 }