update external data key to be string

constraint/pkg/client/drivers/local/local.go

@@ -126,20 +126,6 @@ func (d *driver) Init(ctx context.Context) error {
 				if err := ast.As(regorequest.Value, &regoReq); err != nil {
 					return nil, err
 				}
-				// only primitive types are allowed for keys
-				for _, key := range regoReq.Keys {
-					switch v := key.(type) {
-					case int:
-					case int32:
-					case int64:
-					case string:
-					case float64:
-					case float32:
-						break
-					default:
-						return externaldata.HandleError(http.StatusBadRequest, fmt.Errorf("type %v is not supported in external_data", v))
-					}
-				}
 
 				provider, err := d.providerCache.Get(regoReq.ProviderName)
 				if err != nil {

constraint/pkg/externaldata/request.go

@@ -5,7 +5,7 @@ type RegoRequest struct {
 	// ProviderName is the name of the external data provider.
 	ProviderName string `json:"provider"`
 	// Keys is the list of keys to send to the external data provider.
-	Keys []interface{} `json:"keys"`
+	Keys []string `json:"keys"`
 }
 
 // ProviderRequest is the API request for the external data provider.
@@ -21,11 +21,11 @@ type ProviderRequest struct {
 // Request is the struct that contains the keys to query.
 type Request struct {
 	// Keys is the list of keys to send to the external data provider.
-	Keys []interface{} `json:"keys,omitempty"`
+	Keys []string `json:"keys,omitempty"`
 }
 
 // NewRequest creates a new request for the external data provider.
-func NewProviderRequest(keys []interface{}) *ProviderRequest {
+func NewProviderRequest(keys []string) *ProviderRequest {
 	return &ProviderRequest{
 		APIVersion: "externaldata.gatekeeper.sh/v1alpha1",
 		Kind:       "ProviderRequest",

constraint/pkg/externaldata/response.go

@@ -45,7 +45,7 @@ type Response struct {
 // Items is the struct that contains the key, value or error from a provider response.
 type Item struct {
 	// Key is the request from the provider.
-	Key interface{} `json:"key,omitempty"`
+	Key string `json:"key,omitempty"`
 	// Value is the response from the provider.
 	Value interface{} `json:"value,omitempty"`
 	// Error is the error from the provider.