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File Name : utils.js

// Load modules

var Sntp = require('sntp');
var Boom = require('boom');

// Declare internals

var internals = {};

exports.version = function () {

return require('../package.json').version;
};

exports.limits = {
    maxMatchLength: 4096            // Limit the length of uris and headers to avoid a DoS attack on string matching
};

// Extract host and port from request

//                                            $1                            $2
internals.hostHeaderRegex = /^(?:(?:\r\n)?\s)*((?:[^:]+)|(?:\[[^\]]+\]))(?::(\d+))?(?:(?:\r\n)?\s)*$/;              // (IPv4, hostname)|(IPv6)

exports.parseHost = function (req, hostHeaderName) {

hostHeaderName = (hostHeaderName ? hostHeaderName.toLowerCase() : 'host');
    var hostHeader = req.headers[hostHeaderName];
    if (!hostHeader) {
        return null;
    }

if (hostHeader.length > exports.limits.maxMatchLength) {
        return null;
    }

var hostParts = hostHeader.match(internals.hostHeaderRegex);
    if (!hostParts) {
        return null;
    }

return {
        name: hostParts[1],
        port: (hostParts[2] ? hostParts[2] : (req.connection && req.connection.encrypted ? 443 : 80))
    };
};

// Parse Content-Type header content

exports.parseContentType = function (header) {

if (!header) {
        return '';
    }

return header.split(';')[0].trim().toLowerCase();
};

// Convert node's  to request configuration object

exports.parseRequest = function (req, options) {

if (!req.headers) {
        return req;
    }

// Obtain host and port information

var host;
    if (!options.host ||
        !options.port) {

host = exports.parseHost(req, options.hostHeaderName);
        if (!host) {
            return new Error('Invalid Host header');
        }
    }

var request = {
        method: req.method,
        url: req.url,
        host: options.host || host.name,
        port: options.port || host.port,
        authorization: req.headers.authorization,
        contentType: req.headers['content-type'] || ''
    };

return request;
};

exports.now = function (localtimeOffsetMsec) {

return Sntp.now() + (localtimeOffsetMsec || 0);
};

exports.nowSecs = function (localtimeOffsetMsec) {

return Math.floor(exports.now(localtimeOffsetMsec) / 1000);
};

internals.authHeaderRegex = /^(\w+)(?:\s+(.*))?$/;                                      // Header: scheme[ something]
internals.attributeRegex = /^[ \w\!#\$%&'\*\+,\-\.\/\:;<\=>\?@\[\]\^`\{\|\}~]+$/;   // !#$%&'()*+,-./:;<=>?@[]^_`{|}~ and space, a-z, A-Z, 0-9

// Parse Hawk HTTP Authorization header

exports.parseAuthorizationHeader = function (header, keys) {

keys = keys || ['id', 'ts', 'nonce', 'hash', 'ext', 'mac', 'app', 'dlg'];

if (!header) {
        return Boom.unauthorized(null, 'Hawk');
    }

if (header.length > exports.limits.maxMatchLength) {
        return Boom.badRequest('Header length too long');
    }

var headerParts = header.match(internals.authHeaderRegex);
    if (!headerParts) {
        return Boom.badRequest('Invalid header syntax');
    }

var scheme = headerParts[1];
    if (scheme.toLowerCase() !== 'hawk') {
        return Boom.unauthorized(null, 'Hawk');
    }

var attributesString = headerParts[2];
    if (!attributesString) {
        return Boom.badRequest('Invalid header syntax');
    }

var attributes = {};
    var errorMessage = '';
    var verify = attributesString.replace(/(\w+)="([^"\\]*)"\s*(?:,\s*|$)/g, function ($0, $1, $2) {

// Check valid attribute names

if (keys.indexOf($1) === -1) {
            errorMessage = 'Unknown attribute: ' + $1;
            return;
        }

// Allowed attribute value characters

if ($2.match(internals.attributeRegex) === null) {
            errorMessage = 'Bad attribute value: ' + $1;
            return;
        }

// Check for duplicates

if (attributes.hasOwnProperty($1)) {
            errorMessage = 'Duplicate attribute: ' + $1;
            return;
        }

attributes[$1] = $2;
        return '';
    });

if (verify !== '') {
        return Boom.badRequest(errorMessage || 'Bad header format');
    }

return attributes;
};

exports.unauthorized = function (message, attributes) {

return Boom.unauthorized(message, 'Hawk', attributes);
};

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-03-03 10:41:43
..	dir	-	root/root	0755	2024-03-03 10:41:43
browser.js	text/plain	25.98 KB	root/root	0644	2021-09-28 09:36:06
client.js	text/plain	9.98 KB	root/root	0644	2021-09-28 09:36:06
crypto.js	text/plain	3.38 KB	root/root	0644	2021-09-28 09:36:06
index.js	text/plain	365 B	root/root	0644	2021-09-28 09:36:06
server.js	text/plain	17.58 KB	root/root	0644	2021-09-28 09:36:06
utils.js	text/plain	4.26 KB	root/root	0644	2021-09-28 09:36:06

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