eip-712/lib/es/types.js

Tiny library with utility functions that can help with signing and verifying EIP-712 based messages

import { array, assign, number, object, optional, pattern, record, refine, string, union } from 'superstruct';
export const TYPE_REGEX = /^\w+/;
export const ARRAY_REGEX = /^(.*)\[([0-9]*?)]$/;
export const BYTES_REGEX = /^bytes([0-9]{1,2})$/;
export const NUMBER_REGEX = /^u?int([0-9]{0,3})$/;
export const STATIC_TYPES = ['address', 'bool', 'bytes', 'string'];
const TYPE = refine(string(), 'Type', (type, context) => {
  return isValidType(context.branch[0].types, type);
});
export const EIP_712_TYPE = object({
  name: string(),
  type: TYPE
});
export const EIP_712_DOMAIN_TYPE = object({
  name: optional(string()),
  version: optional(string()),
  chainId: optional(union([string(), number()])),
  verifyingContract: optional(pattern(string(), /^0x[0-9a-z]{40}$/i)),
  salt: optional(union([array(number()), pattern(string(), /^0x[0-9a-z]{64}$/i)]))
});
export const EIP_712_TYPED_DATA_TYPE = object({
  types: record(string(), array(EIP_712_TYPE)),
  primaryType: string(),
  domain: object(),
  message: object()
});
export const EIP_712_STRICT_TYPED_DATA_TYPE = assign(EIP_712_TYPED_DATA_TYPE, object({
  domain: EIP_712_DOMAIN_TYPE
}));
export const isValidType = (types, type) => {
  if (STATIC_TYPES.includes(type)) {
    return true;
  }

  if (types[type]) {
    return true;
  }

  if (type.match(ARRAY_REGEX)) {
    const match = type.match(TYPE_REGEX);

    if (match) {
      const innerType = match[0];
      return isValidType(types, innerType);
    }
  }

  const bytesMatch = type.match(BYTES_REGEX);

  if (bytesMatch) {
    const length = Number(bytesMatch[1]);

    if (length >= 1 && length <= 32) {
      return true;
    }
  }

  const numberMatch = type.match(NUMBER_REGEX);

  if (numberMatch) {
    const length = Number(numberMatch[1]);

    if (length >= 8 && length <= 256 && length % 8 === 0) {
      return true;
    }
  }

  return false;
};
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