eth-typed-data
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A library to simplifiy interacting with and signing EIP712 typed data
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<a href="index.html">All files</a> primitives.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">export const ATOMICS = [
'bytes1', 'bytes2', 'bytes4', 'bytes8', 'bytes16', 'bytes32',
'uint8', 'uint16', 'uint32', 'uint64', 'uint128', 'uint256',
'int8', 'int16', 'int32', 'int64', 'int128', 'int256',
'address', 'bool'
]
export const DYNAMICS = [
'string', 'bytes'
]
/**
* Return true if the argument is an array type
* @param {String} type
* @returns {Boolean}
*/
export function isArrayType(type) {
return type.length > 2 && type.slice(-2) === '[]'
}
/**
* Return the type
* @param {String} type
* @returns {String}
*/
export function getElementaryType(type) {
if (isArrayType(type)) return type.slice(0,-2)
throw new Error("Can't get element of non-array type")
}
/**
* Return true if the argument is an atomic type in the EIP712 schema
* @param {String} type
* @returns {Boolean}
*/
export function isAtomicType(type) {
return ATOMICS.includes(type)
}
/**
* Return true if the argument is the name of a dynamic type in the EIP712 schema
* @param {String} type
* @returns {Boolean}
*/
export function isDynamicType(type) {
return DYNAMICS.includes(type)
}
/**
* Determine if the argument is a EIP712 primitive type, i.e. a dynamic or atomic type
* @param {String} type
* @returns {Boolean}
*/
export function isPrimitiveType(type) {
return isAtomicType(type) || isDynamicType(type)
}
/**
* Determine if the argument is not a structure type, i.e. it is a primitive type or an
* arbitrarily nested array of structure types
* @param {String} type
* @returns {Boolean}
*/
export function isNotStructureType(type) {
if (isPrimitiveType(type)) return true
if (isArrayType(type)) return isNotStructureType(getElementaryType(type))
return false
}
// /**
// * Validation utility function to switch on javascript types and
// * handle each with a custom function
// * @param {Object} handlers An object mapping javascript types to a validation function for that type
// * @returns {Function} a validation function which will delegate to one of the provided validators
// * according to the type of the input
// */
// function handleByType(target, handlers) {
// return input => {
// const jstype = typeof input
// if (jstype in handlers) return handlers[jstype](input)
// throw new Error(`Cannot convert javascript type ${jstype} to solidity type ${target}`)
// }
// }
// /**
// * Throw an error with a given message. This is convenient for throwing
// * an error inside an expression without having to create a full function.
// * @param {String} message message for the error to be thrown
// */
// function reject(message) {
// throw new Error(message)
// }
/**
* Validation functions for unifying javascript representations of solidity types
*/
export const validate = {
bytes1: x => x,
bytes2: x => x,
bytes4: x => x,
bytes8: x => x,
bytes16: x => x,
bytes32: x => x,
uint8: x => x,
uint16: x => x,
uint32: x => x,
uint64: x => x,
uint128: x => x,
uint256: x => x,
int8: x => x,
int16: x => x,
int32: x => x,
int64: x => x,
int128: x => x,
int256: x => x,
address: x => x,
// approach for type mapping
// address: handleByType('address', {
// string: x => x.slice(2) === '0x' ? x : `0x${x}`,
// object: x => x instanceof Buffer ? `0x${x.toString('hex')}` : reject('Cannot coerce object to address: must be string or Buffer')
// }),
bool: x => x,
string: x => x,
bytes: x => Buffer.from(x)
}
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