json_wire.go

package yin

import (
	"encoding/json"
	"errors"
	"fmt"
)

func validateJSONFormatVersion(raw json.RawMessage, present bool, want int) error {
	if !present {
		return errors.New("missing formatVersion")
	}

	var got *int
	if err := json.Unmarshal(raw, &got); err != nil {
		return fmt.Errorf("formatVersion must be an integer: %w", err)
	}
	if got == nil {
		return errors.New("formatVersion must be an integer")
	}
	if *got != want {
		return fmt.Errorf("unsupported formatVersion %d, want %d", *got, want)
	}
	return nil
}

func requireJSONFormatVersion(raw json.RawMessage, want int, boundary string) error {
	if err := validateJSONFormatVersion(raw, raw != nil, want); err != nil {
		return fmt.Errorf("yin: malformed %s: %w", boundary, err)
	}
	return nil
}