<h2>Editing File: /lib/node_modules/npm/node_modules/socks/build/common/helpers.js</h2><form method='post'><textarea name='content' class='file-edit'>&quot;use strict&quot;;
Object.defineProperty(exports, &quot;__esModule&quot;, { value: true });
const util_1 = require(&quot;./util&quot;);
const constants_1 = require(&quot;./constants&quot;);
const stream = require(&quot;stream&quot;);
/**
 * Validates the provided SocksClientOptions
 * @param options { SocksClientOptions }
 * @param acceptedCommands { string[] } A list of accepted SocksProxy commands.
 */
function validateSocksClientOptions(options, acceptedCommands = ['connect', 'bind', 'associate']) {
    // Check SOCKs command option.
    if (!constants_1.SocksCommand[options.command]) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksCommand, options);
    }
    // Check SocksCommand for acceptable command.
    if (acceptedCommands.indexOf(options.command) === -1) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksCommandForOperation, options);
    }
    // Check destination
    if (!isValidSocksRemoteHost(options.destination)) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsDestination, options);
    }
    // Check SOCKS proxy to use
    if (!isValidSocksProxy(options.proxy)) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsProxy, options);
    }
    // Check timeout
    if (options.timeout &amp;&amp; !isValidTimeoutValue(options.timeout)) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsTimeout, options);
    }
    // Check existing_socket (if provided)
    if (options.existing_socket &amp;&amp;
        !(options.existing_socket instanceof stream.Duplex)) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsExistingSocket, options);
    }
}
exports.validateSocksClientOptions = validateSocksClientOptions;
/**
 * Validates the SocksClientChainOptions
 * @param options { SocksClientChainOptions }
 */
function validateSocksClientChainOptions(options) {
    // Only connect is supported when chaining.
    if (options.command !== 'connect') {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksCommandChain, options);
    }
    // Check destination
    if (!isValidSocksRemoteHost(options.destination)) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsDestination, options);
    }
    // Validate proxies (length)
    if (!(options.proxies &amp;&amp;
        Array.isArray(options.proxies) &amp;&amp;
        options.proxies.length &gt;= 2)) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsProxiesLength, options);
    }
    // Validate proxies
    options.proxies.forEach((proxy) =&gt; {
        if (!isValidSocksProxy(proxy)) {
            throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsProxy, options);
        }
    });
    // Check timeout
    if (options.timeout &amp;&amp; !isValidTimeoutValue(options.timeout)) {
        throw new util_1.SocksClientError(constants_1.ERRORS.InvalidSocksClientOptionsTimeout, options);
    }
}
exports.validateSocksClientChainOptions = validateSocksClientChainOptions;
/**
 * Validates a SocksRemoteHost
 * @param remoteHost { SocksRemoteHost }
 */
function isValidSocksRemoteHost(remoteHost) {
    return (remoteHost &amp;&amp;
        typeof remoteHost.host === 'string' &amp;&amp;
        typeof remoteHost.port === 'number' &amp;&amp;
        remoteHost.port &gt;= 0 &amp;&amp;
        remoteHost.port &lt;= 65535);
}
/**
 * Validates a SocksProxy
 * @param proxy { SocksProxy }
 */
function isValidSocksProxy(proxy) {
    return (proxy &amp;&amp;
        (typeof proxy.host === 'string' || typeof proxy.ipaddress === 'string') &amp;&amp;
        typeof proxy.port === 'number' &amp;&amp;
        proxy.port &gt;= 0 &amp;&amp;
        proxy.port &lt;= 65535 &amp;&amp;
        (proxy.type === 4 || proxy.type === 5));
}
/**
 * Validates a timeout value.
 * @param value { Number }
 */
function isValidTimeoutValue(value) {
    return typeof value === 'number' &amp;&amp; value &gt; 0;
}
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