From 89c1c88b4525c7fc7875f48ba7febccd9f568316 Mon Sep 17 00:00:00 2001
From: Martin Necas <mnecas@redhat.com>
Date: Tue, 2 Apr 2024 15:20:27 +0200
Subject: [PATCH] OCM-7110 | fix: GitHub IDP validation

Switch from URI validation to the DNS1123 validation.
The openshift does not accept the URI format of domains. So when user specifies some address with prefix https:// it will fail.

Signed-off-by: Martin Necas <mnecas@redhat.com>
---
 cmd/create/idp/github.go           |  9 ++++-----
 pkg/interactive/validation.go      | 18 ++++++++++++++++++
 pkg/interactive/validation_test.go | 13 +++++++++++++
 3 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/cmd/create/idp/github.go b/cmd/create/idp/github.go
index 06198129a4..7b2fe31a24 100644
--- a/cmd/create/idp/github.go
+++ b/cmd/create/idp/github.go
@@ -24,10 +24,9 @@ import (
 	"strings"
 
 	cmv1 "github.com/openshift-online/ocm-sdk-go/clustersmgmt/v1"
-	"github.com/spf13/cobra"
-
 	"github.com/openshift/rosa/pkg/interactive"
 	"github.com/openshift/rosa/pkg/ocm"
+	"github.com/spf13/cobra"
 )
 
 func buildGithubIdp(cmd *cobra.Command,
@@ -190,7 +189,7 @@ func buildGithubIdp(cmd *cobra.Command,
 			Help:     cmd.Flags().Lookup("hostname").Usage,
 			Default:  githubHostname,
 			Validators: []interactive.Validator{
-				interactive.IsURL,
+				interactive.IsValidHostname,
 			},
 		})
 		if err != nil {
@@ -201,9 +200,9 @@ func buildGithubIdp(cmd *cobra.Command,
 		return idpBuilder, fmt.Errorf("CA is not expected when not using a hosted instance of Github Enterprise")
 	}
 	if githubHostname != "" {
-		_, err = url.ParseRequestURI(githubHostname)
+		err := interactive.IsValidHostname(githubHostname)
 		if err != nil {
-			return idpBuilder, fmt.Errorf("Expected a valid Hostname: %s", err)
+			return idpBuilder, err
 		}
 		// Set the hostname, if any
 		githubIDP = githubIDP.Hostname(githubHostname)
diff --git a/pkg/interactive/validation.go b/pkg/interactive/validation.go
index 712c3d6b1c..42e9b18ff9 100644
--- a/pkg/interactive/validation.go
+++ b/pkg/interactive/validation.go
@@ -26,6 +26,9 @@ import (
 	"regexp"
 	"strconv"
 
+	"k8s.io/apimachinery/pkg/util/validation"
+	netutils "k8s.io/utils/net"
+	
 	"github.com/AlecAivazis/survey/v2"
 	"github.com/AlecAivazis/survey/v2/core"
 	clustervalidations "github.com/openshift-online/ocm-common/pkg/cluster/validations"
@@ -59,6 +62,21 @@ func IsURL(val interface{}) error {
 	return err
 }
 
+func IsValidHostname(val interface{}) error {
+	if !_isValidHostname(val.(string)) {
+		return fmt.Errorf(fmt.Sprintf("'%s' hostname must be a valid DNS subdomain or IP address", val.(string)))
+	}
+	return nil
+}
+
+// _isValidHostname is same validation as in the Open Shift GitHub IDP CRD
+// https://github.com/openshift/kubernetes/blob/91607f5d750ba4002f87d34a12ae1cfd45b45b81/openshift-kube-apiserver/admission/customresourcevalidation/oauth/helpers.go#L13
+//
+//nolint:lll
+func _isValidHostname(hostname string) bool {
+	return len(validation.IsDNS1123Subdomain(hostname)) == 0 || netutils.ParseIPSloppy(hostname) != nil
+}
+
 func IsURLHttps(val interface{}) error {
 	parsedUri, err := _isUrl(val)
 	if err != nil {
diff --git a/pkg/interactive/validation_test.go b/pkg/interactive/validation_test.go
index 73750aed30..11bd9834c7 100644
--- a/pkg/interactive/validation_test.go
+++ b/pkg/interactive/validation_test.go
@@ -77,5 +77,18 @@ var _ = Describe("Validation", func() {
 			Expect(err).NotTo(HaveOccurred())
 		})
 	})
+	Context("GitHub Hostname", func() {
+		It("Fails validation if hostname is 'https://github.com'", func() {
+			err := IsValidHostname("https://github.com")
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring(
+				"'https://github.com' hostname must be a valid DNS subdomain or IP address"),
+			)
+		})
+		It("Passes validation if hostname is 'domain.customer.com'", func() {
+			err := IsValidHostname("domain.customer.com")
+			Expect(err).NotTo(HaveOccurred())
+		})
+	})
 
 })