--- /dev/null
+'use strict';
+
+//
+// Allowed token characters:
+//
+// '!', '#', '$', '%', '&', ''', '*', '+', '-',
+// '.', 0-9, A-Z, '^', '_', '`', a-z, '|', '~'
+//
+// tokenChars[32] === 0 // ' '
+// tokenChars[33] === 1 // '!'
+// tokenChars[34] === 0 // '"'
+// ...
+//
+const tokenChars = [
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
+ 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, // 32 - 47
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63
+ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, // 80 - 95
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 // 112 - 127
+];
+
+/**
+ * Adds an offer to the map of extension offers or a parameter to the map of
+ * parameters.
+ *
+ * @param {Object} dest The map of extension offers or parameters
+ * @param {String} name The extension or parameter name
+ * @param {(Object|Boolean|String)} elem The extension parameters or the
+ * parameter value
+ * @private
+ */
+function push (dest, name, elem) {
+ if (Object.prototype.hasOwnProperty.call(dest, name)) dest[name].push(elem);
+ else dest[name] = [elem];
+}
+
+/**
+ * Parses the `Sec-WebSocket-Extensions` header into an object.
+ *
+ * @param {String} header The field value of the header
+ * @return {Object} The parsed object
+ * @public
+ */
+function parse (header) {
+ const offers = {};
+
+ if (header === undefined || header === '') return offers;
+
+ var params = {};
+ var mustUnescape = false;
+ var isEscaping = false;
+ var inQuotes = false;
+ var extensionName;
+ var paramName;
+ var start = -1;
+ var end = -1;
+
+ for (var i = 0; i < header.length; i++) {
+ const code = header.charCodeAt(i);
+
+ if (extensionName === undefined) {
+ if (end === -1 && tokenChars[code] === 1) {
+ if (start === -1) start = i;
+ } else if (code === 0x20/* ' ' */|| code === 0x09/* '\t' */) {
+ if (end === -1 && start !== -1) end = i;
+ } else if (code === 0x3b/* ';' */ || code === 0x2c/* ',' */) {
+ if (start === -1) {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+
+ if (end === -1) end = i;
+ const name = header.slice(start, end);
+ if (code === 0x2c) {
+ push(offers, name, params);
+ params = {};
+ } else {
+ extensionName = name;
+ }
+
+ start = end = -1;
+ } else {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+ } else if (paramName === undefined) {
+ if (end === -1 && tokenChars[code] === 1) {
+ if (start === -1) start = i;
+ } else if (code === 0x20 || code === 0x09) {
+ if (end === -1 && start !== -1) end = i;
+ } else if (code === 0x3b || code === 0x2c) {
+ if (start === -1) {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+
+ if (end === -1) end = i;
+ push(params, header.slice(start, end), true);
+ if (code === 0x2c) {
+ push(offers, extensionName, params);
+ params = {};
+ extensionName = undefined;
+ }
+
+ start = end = -1;
+ } else if (code === 0x3d/* '=' */&& start !== -1 && end === -1) {
+ paramName = header.slice(start, i);
+ start = end = -1;
+ } else {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+ } else {
+ //
+ // The value of a quoted-string after unescaping must conform to the
+ // token ABNF, so only token characters are valid.
+ // Ref: https://tools.ietf.org/html/rfc6455#section-9.1
+ //
+ if (isEscaping) {
+ if (tokenChars[code] !== 1) {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+ if (start === -1) start = i;
+ else if (!mustUnescape) mustUnescape = true;
+ isEscaping = false;
+ } else if (inQuotes) {
+ if (tokenChars[code] === 1) {
+ if (start === -1) start = i;
+ } else if (code === 0x22/* '"' */ && start !== -1) {
+ inQuotes = false;
+ end = i;
+ } else if (code === 0x5c/* '\' */) {
+ isEscaping = true;
+ } else {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+ } else if (code === 0x22 && header.charCodeAt(i - 1) === 0x3d) {
+ inQuotes = true;
+ } else if (end === -1 && tokenChars[code] === 1) {
+ if (start === -1) start = i;
+ } else if (start !== -1 && (code === 0x20 || code === 0x09)) {
+ if (end === -1) end = i;
+ } else if (code === 0x3b || code === 0x2c) {
+ if (start === -1) {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+
+ if (end === -1) end = i;
+ var value = header.slice(start, end);
+ if (mustUnescape) {
+ value = value.replace(/\\/g, '');
+ mustUnescape = false;
+ }
+ push(params, paramName, value);
+ if (code === 0x2c) {
+ push(offers, extensionName, params);
+ params = {};
+ extensionName = undefined;
+ }
+
+ paramName = undefined;
+ start = end = -1;
+ } else {
+ throw new SyntaxError(`Unexpected character at index ${i}`);
+ }
+ }
+ }
+
+ if (start === -1 || inQuotes) {
+ throw new SyntaxError('Unexpected end of input');
+ }
+
+ if (end === -1) end = i;
+ const token = header.slice(start, end);
+ if (extensionName === undefined) {
+ push(offers, token, {});
+ } else {
+ if (paramName === undefined) {
+ push(params, token, true);
+ } else if (mustUnescape) {
+ push(params, paramName, token.replace(/\\/g, ''));
+ } else {
+ push(params, paramName, token);
+ }
+ push(offers, extensionName, params);
+ }
+
+ return offers;
+}
+
+/**
+ * Builds the `Sec-WebSocket-Extensions` header field value.
+ *
+ * @param {Object} extensions The map of extensions and parameters to format
+ * @return {String} A string representing the given object
+ * @public
+ */
+function format (extensions) {
+ return Object.keys(extensions).map((extension) => {
+ var configurations = extensions[extension];
+ if (!Array.isArray(configurations)) configurations = [configurations];
+ return configurations.map((params) => {
+ return [extension].concat(Object.keys(params).map((k) => {
+ var values = params[k];
+ if (!Array.isArray(values)) values = [values];
+ return values.map((v) => v === true ? k : `${k}=${v}`).join('; ');
+ })).join('; ');
+ }).join(', ');
+ }).join(', ');
+}
+
+module.exports = { format, parse };
projects / VSoRC / .git / blobdiff