OSD-15841: Check proxy and API connection if login failed

cmd/ocm-backplane/login/login.go

@@ -207,6 +207,12 @@ func runLogin(cmd *cobra.Command, argv []string) (err error) {
 			// Hibernating, print an error
 			return fmt.Errorf("cluster %s is hibernating, login failed", clusterKey)
 		}
+		// Check API connection with configured proxy
+		err = bpConfig.CheckAPIConnection()
+		if err != nil {
+			return fmt.Errorf("cannot connect to backplane API URL,Check if you need to use a proxy/VPN to access backplane. error: %v", err)
+		}
+
 		// Otherwise, return the failure
 		return fmt.Errorf("can't login to cluster: %v", err)
 	}

cmd/ocm-backplane/login/login_test.go

@@ -283,7 +283,24 @@ var _ = Describe("Login command", func() {
 			err = runLogin(nil, []string{testClusterId})
 
 			Expect(err).NotTo(BeNil())
-			Expect(err.Error()).Should(ContainSubstring("unable to connect to backplane api"))
+			Expect(err.Error()).Should(ContainSubstring("cannot connect to backplane API URL"))
+
+		})
+
+		It("should fail when proxy not avaliable", func() {
+
+			err := utils.CreateTempKubeConfig(nil)
+			Expect(err).To(BeNil())
+			mockOcmInterface.EXPECT().GetTargetCluster(testClusterId).Return(trueClusterId, testClusterId, nil)
+			mockOcmInterface.EXPECT().IsClusterHibernating(gomock.Eq(trueClusterId)).Return(false, nil).AnyTimes()
+			mockOcmInterface.EXPECT().GetOCMAccessToken().Return(&testToken, nil)
+			mockClientUtil.EXPECT().MakeRawBackplaneAPIClientWithAccessToken(backplaneAPIUri, testToken).Return(mockClient, nil)
+			mockClient.EXPECT().LoginCluster(gomock.Any(), gomock.Eq(trueClusterId)).Return(fakeResp, errors.New("proxyconnect tcp: dial tcp: lookup yourproxy.com: no such host "))
+
+			err = runLogin(nil, []string{testClusterId})
+
+			Expect(err).NotTo(BeNil())
+			Expect(err.Error()).Should(ContainSubstring("Check if you need to use a proxy/VPN to access backplane"))
 
 		})
 

pkg/cli/config/config.go

@@ -1,8 +1,12 @@
 package config
 
 import (
+	"errors"
+	"net/http"
+	"net/url"
 	"os"
 	"path/filepath"
+	"time"
 
 	"github.com/openshift/backplane-cli/pkg/info"
 	"github.com/spf13/viper"
@@ -70,3 +74,46 @@ func GetBackplaneConfiguration() (bpConfig BackplaneConfiguration, err error) {
 
 	return bpConfig, nil
 }
+
+// CheckAPIConnection validate API connection via configured proxy and VPN
+func (config BackplaneConfiguration) CheckAPIConnection() error {
+
+	// Check backplane Proxy URL
+	if config.ProxyURL == "" {
+		//Cannot connect to backplane API URL: Check if you need to use a proxy/VPN to access backplane
+		return errors.New("empty proxy url - check your backplane-cli configuration in $HOME/.config/backplane/config.json")
+	}
+
+	// Check proxy connection
+	connectionOk, err := config.pingBackplaneAPIviaProxy()
+
+	if !connectionOk {
+		return err
+	}
+
+	return nil
+}
+
+// pingBackplaneAPIviaProxy returns status of the the API connection
+func (config BackplaneConfiguration) pingBackplaneAPIviaProxy() (bool, error) {
+	client := http.Client{
+		Timeout: 5 * time.Second,
+	}
+
+	proxyUrl, err := url.Parse(config.ProxyURL)
+	if err != nil {
+		return false, err
+	}
+	http.DefaultTransport = &http.Transport{Proxy: http.ProxyURL(proxyUrl)}
+
+	req, err := http.NewRequest("HEAD", config.URL, nil)
+	if err != nil {
+		return false, err
+	}
+	_, err = client.Do(req)
+	if err != nil {
+		return false, err
+	}
+
+	return true, nil
+}