initial commit

app/node_modules/hawk/lib/utils.js

@@ -0,0 +1,186 @@
+'use strict';
+
+// Load modules
+
+const Sntp = require('sntp');
+const Boom = require('boom');
+
+
+// Declare internals
+
+const 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)*$/;              // (IPv4, hostname)|(IPv6)
+
+
+exports.parseHost = function (req, hostHeaderName) {
+
+    hostHeaderName = (hostHeaderName ? hostHeaderName.toLowerCase() : 'host');
+    const hostHeader = req.headers[hostHeaderName];
+    if (!hostHeader) {
+        return null;
+    }
+
+    if (hostHeader.length > exports.limits.maxMatchLength) {
+        return null;
+    }
+
+    const hostParts = hostHeader.match(internals.hostHeaderRegex);
+    if (!hostParts) {
+        return null;
+    }
+
+    return {
+        name: hostParts[1],
+        port: (hostParts[2] ? hostParts[2] : (req.connection && req.connection.encrypted ? 443 : 80))
+    };
+};
+
+
+// Parse Content-Type header content
+
+exports.parseContentType = function (header) {
+
+    if (!header) {
+        return '';
+    }
+
+    return header.split(';')[0].trim().toLowerCase();
+};
+
+
+// Convert node's  to request configuration object
+
+exports.parseRequest = function (req, options) {
+
+    if (!req.headers) {
+        return req;
+    }
+
+    // Obtain host and port information
+
+    let host;
+    if (!options.host ||
+        !options.port) {
+
+        host = exports.parseHost(req, options.hostHeaderName);
+        if (!host) {
+            return new Error('Invalid Host header');
+        }
+    }
+
+    const request = {
+        method: req.method,
+        url: req.url,
+        host: options.host || host.name,
+        port: options.port || host.port,
+        authorization: req.headers.authorization,
+        contentType: req.headers['content-type'] || ''
+    };
+
+    return request;
+};
+
+
+exports.now = function (localtimeOffsetMsec) {
+
+    return Sntp.now() + (localtimeOffsetMsec || 0);
+};
+
+
+exports.nowSecs = function (localtimeOffsetMsec) {
+
+    return Math.floor(exports.now(localtimeOffsetMsec) / 1000);
+};
+
+
+internals.authHeaderRegex = /^(\w+)(?:\s+(.*))?$/;                                      // 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');
+    }
+
+    const headerParts = header.match(internals.authHeaderRegex);
+    if (!headerParts) {
+        return Boom.badRequest('Invalid header syntax');
+    }
+
+    const scheme = headerParts[1];
+    if (scheme.toLowerCase() !== 'hawk') {
+        return Boom.unauthorized(null, 'Hawk');
+    }
+
+    const attributesString = headerParts[2];
+    if (!attributesString) {
+        return Boom.badRequest('Invalid header syntax');
+    }
+
+    const attributes = {};
+    let errorMessage = '';
+    const verify = attributesString.replace(/(\w+)="([^"\\]*)"\s*(?:,\s*|$)/g, ($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 || null, 'Hawk', attributes);
+};
+