fix(registry validation): adding input validation

Author: amoghrajesh

pkg/cmd/flag/flag.go

@@ -49,3 +49,7 @@ func RequiredWhenNonInteractiveError(flags ...string) error {
 	}
 	return fmt.Errorf("%v %v required when not running interactively", flagsF, flagTitle)
 }
+
+func OutOfRangeError(flag string, value int32) *Error {
+	return &Error{Err: fmt.Errorf("out of range value of %d for %v, only positive values are allowed", value, flag)}
+}

pkg/cmd/registry/list/list.go

@@ -64,6 +64,13 @@ func NewListCommand(f *factory.Factory) *cobra.Command {
 			if opts.outputFormat != "" && !flagutil.IsValidInput(opts.outputFormat, flagutil.ValidOutputFormats...) {
 				return flag.InvalidValueError("output", opts.outputFormat, flagutil.ValidOutputFormats...)
 			}
+			if !flagutil.IsInputInRange(opts.page) {
+				return flag.OutOfRangeError("page", opts.page)
+			}
+
+			if !flagutil.IsInputInRange(opts.limit) {
+				return flag.OutOfRangeError("limit", opts.limit)
+			}
 
 			return runList(opts)
 		},

pkg/cmdutil/flags/flags.go

@@ -35,3 +35,7 @@ func EnableOutputFlagCompletion(cmd *cobra.Command) {
 		return ValidOutputFormats, cobra.ShellCompDirectiveNoSpace
 	})
 }
+
+func IsInputInRange(input int32) bool {
+	return input > 0
+}