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// 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);
};
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