Add cors bits into configutil listener (#9054)

* Add cors config to configutil listener parsing

* Set purposeraw to nil after parsing like other params

* Use canonical mime headers

internalshared/configutil/listener.go

@@ -3,6 +3,7 @@ package configutil
 import (
 	"errors"
 	"fmt"
+	"net/textproto"
 	"strings"
 	"time"
 
@@ -11,6 +12,7 @@ import (
 	"github.com/hashicorp/hcl"
 	"github.com/hashicorp/hcl/hcl/ast"
 	"github.com/hashicorp/vault/sdk/helper/parseutil"
+	"github.com/hashicorp/vault/sdk/helper/strutil"
 	"github.com/hashicorp/vault/sdk/helper/tlsutil"
 )
 
@@ -81,6 +83,12 @@ type Listener struct {
 
 	// RandomPort is used only for some testing purposes
 	RandomPort bool `hcl:"-"`
+
+	CorsEnabledRaw        interface{} `hcl:"cors_enabled"`
+	CorsEnabled           bool        `hcl:"-"`
+	CorsAllowedOrigins    []string    `hcl:"cors_allowed_origins"`
+	CorsAllowedHeaders    []string    `hcl:"-"`
+	CorsAllowedHeadersRaw []string    `hcl:"cors_allowed_headers"`
 }
 
 func (l *Listener) GoString() string {
@@ -127,6 +135,8 @@ func ParseListeners(result *SharedConfig, list *ast.ObjectList) error {
 				for i, v := range l.Purpose {
 					l.Purpose[i] = strings.ToLower(v)
 				}
+
+				l.PurposeRaw = nil
 			}
 		}
 
@@ -308,6 +318,27 @@ func ParseListeners(result *SharedConfig, list *ast.ObjectList) error {
 			}
 		}
 
+		// CORS
+		{
+			if l.CorsEnabledRaw != nil {
+				if l.CorsEnabled, err = parseutil.ParseBool(l.CorsEnabledRaw); err != nil {
+					return multierror.Prefix(fmt.Errorf("invalid value for cors_enabled: %w", err), fmt.Sprintf("listeners.%d", i))
+				}
+
+				l.CorsEnabledRaw = nil
+			}
+
+			if strutil.StrListContains(l.CorsAllowedOrigins, "*") && len(l.CorsAllowedOrigins) > 1 {
+				return multierror.Prefix(errors.New("cors_allowed_origins must only contain a wildcard or only non-wildcard values"), fmt.Sprintf("listeners.%d", i))
+			}
+
+			if len(l.CorsAllowedHeadersRaw) > 0 {
+				for _, header := range l.CorsAllowedHeadersRaw {
+					l.CorsAllowedHeaders = append(l.CorsAllowedHeaders, textproto.CanonicalMIMEHeaderKey(header))
+				}
+			}
+		}
+
 		result.Listeners = append(result.Listeners, &l)
 	}