check-ethereum-scanner/Ethereum-Renounced-Contract-Scanner-backup/node_modules/ethereum-bloom-filters/dist/index.js

Safety checks for new Ethereum tokens

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const utils_1 = require("./utils");
/**
 * Returns true if the bloom is a valid bloom
 * @param bloom The bloom
 */
function isBloom(bloom) {
    if (typeof bloom !== 'string') {
        return false;
    }
    if (!/^(0x)?[0-9a-f]{512}$/i.test(bloom)) {
        return false;
    }
    if (/^(0x)?[0-9a-f]{512}$/.test(bloom) ||
        /^(0x)?[0-9A-F]{512}$/.test(bloom)) {
        return true;
    }
    return false;
}
exports.isBloom = isBloom;
/**
 * Returns true if the value is part of the given bloom
 * note: false positives are possible.
 * @param bloom encoded bloom
 * @param value The value
 */
function isInBloom(bloom, value) {
    if (typeof value === 'object' && value.constructor === Uint8Array) {
        value = utils_1.bytesToHex(value);
    }
    const hash = utils_1.keccak256(value).replace('0x', '');
    for (let i = 0; i < 12; i += 4) {
        // calculate bit position in bloom filter that must be active
        const bitpos = ((parseInt(hash.substr(i, 2), 16) << 8) +
            parseInt(hash.substr(i + 2, 2), 16)) &
            2047;
        // test if bitpos in bloom is active
        const code = codePointToInt(bloom.charCodeAt(bloom.length - 1 - Math.floor(bitpos / 4)));
        const offset = 1 << bitpos % 4;
        if ((code & offset) !== offset) {
            return false;
        }
    }
    return true;
}
exports.isInBloom = isInBloom;
/**
 * Code points to int
 * @param codePoint The code point
 */
function codePointToInt(codePoint) {
    if (codePoint >= 48 && codePoint <= 57) {
        /* ['0'..'9'] -> [0..9] */
        return codePoint - 48;
    }
    if (codePoint >= 65 && codePoint <= 70) {
        /* ['A'..'F'] -> [10..15] */
        return codePoint - 55;
    }
    if (codePoint >= 97 && codePoint <= 102) {
        /* ['a'..'f'] -> [10..15] */
        return codePoint - 87;
    }
    throw new Error('invalid bloom');
}
/**
 * Returns true if the ethereum users address is part of the given bloom.
 * note: false positives are possible.
 * @param bloom encoded bloom
 * @param address the address to test
 */
function isUserEthereumAddressInBloom(bloom, ethereumAddress) {
    if (!isBloom(bloom)) {
        throw new Error('Invalid bloom given');
    }
    if (!isAddress(ethereumAddress)) {
        throw new Error(`Invalid ethereum address given: "${ethereumAddress}"`);
    }
    // you have to pad the ethereum address to 32 bytes
    // else the bloom filter does not work
    // this is only if your matching the USERS
    // ethereum address. Contract address do not need this
    // hence why we have 2 methods
    // (0x is not in the 2nd parameter of padleft so 64 chars is fine)
    const address = utils_1.padLeft(ethereumAddress, 64);
    return isInBloom(bloom, address);
}
exports.isUserEthereumAddressInBloom = isUserEthereumAddressInBloom;
/**
 * Returns true if the contract address is part of the given bloom.
 * note: false positives are possible.
 * @param bloom encoded bloom
 * @param contractAddress the contract address to test
 */
function isContractAddressInBloom(bloom, contractAddress) {
    if (!isBloom(bloom)) {
        throw new Error('Invalid bloom given');
    }
    if (!isAddress(contractAddress)) {
        throw new Error(`Invalid contract address given: "${contractAddress}"`);
    }
    return isInBloom(bloom, contractAddress);
}
exports.isContractAddressInBloom = isContractAddressInBloom;
/**
 * Returns true if the topic is part of the given bloom.
 * note: false positives are possible.
 * @param bloom encoded bloom
 * @param topic the topic encoded hex
 */
function isTopicInBloom(bloom, topic) {
    if (!isBloom(bloom)) {
        throw new Error('Invalid bloom given');
    }
    if (!isTopic(topic)) {
        throw new Error('Invalid topic');
    }
    return isInBloom(bloom, topic);
}
exports.isTopicInBloom = isTopicInBloom;
/**
 * Checks if its a valid topic
 * @param topic encoded hex topic
 */
function isTopic(topic) {
    if (typeof topic !== 'string') {
        return false;
    }
    if (!/^(0x)?[0-9a-f]{64}$/i.test(topic)) {
        return false;
    }
    else if (/^(0x)?[0-9a-f]{64}$/.test(topic) ||
        /^(0x)?[0-9A-F]{64}$/.test(topic)) {
        return true;
    }
    return false;
}
exports.isTopic = isTopic;
/**
 * Is valid address
 * @param address The address
 */
function isAddress(address) {
    if (typeof address !== 'string') {
        return false;
    }
    if (address.match(/^(0x)?[0-9a-fA-F]{40}$/)) {
        return true;
    }
    if (address.match(/^XE[0-9]{2}[0-9A-Za-z]{30,31}$/)) {
        return true;
    }
    return false;
}
exports.isAddress = isAddress;