1 files changed, 67 insertions, 0 deletions
diff --git a/node_modules/ws/lib/Extensions.js b/node_modules/ws/lib/Extensions.js
new file mode 100644
index 0000000..a91910e
--- /dev/null
+++ b/node_modules/ws/lib/Extensions.js
@@ -0,0 +1,67 @@
+'use strict';
+
+/**
+ * Parse the `Sec-WebSocket-Extensions` header into an object.
+ *
+ * @param {String} value field value of the header
+ * @return {Object} The parsed object
+ * @public
+ */
+const parse = (value) => {
+  value = value || '';
+
+  const extensions = {};
+
+  value.split(',').forEach((v) => {
+    const params = v.split(';');
+    const token = params.shift().trim();
+    const paramsList = extensions[token] = extensions[token] || [];
+    const parsedParams = {};
+
+    params.forEach((param) => {
+      const parts = param.trim().split('=');
+      const key = parts[0];
+      var value = parts[1];
+
+      if (value === undefined) {
+        value = true;
+      } else {
+        // unquote value
+        if (value[0] === '"') {
+          value = value.slice(1);
+        }
+        if (value[value.length - 1] === '"') {
+          value = value.slice(0, value.length - 1);
+        }
+      }
+      (parsedParams[key] = parsedParams[key] || []).push(value);
+    });
+
+    paramsList.push(parsedParams);
+  });
+
+  return extensions;
+};
+
+/**
+ * Serialize a parsed `Sec-WebSocket-Extensions` header to a string.
+ *
+ * @param {Object} value The object to format
+ * @return {String} A string representing the given value
+ * @public
+ */
+const format = (value) => {
+  return Object.keys(value).map((token) => {
+    var paramsList = value[token];
+    if (!Array.isArray(paramsList)) paramsList = [paramsList];
+    return paramsList.map((params) => {
+      return [token].concat(Object.keys(params).map((k) => {
+        var p = params[k];
+        if (!Array.isArray(p)) p = [p];
+        return p.map((v) => v === true ? k : `${k}=${v}`).join('; ');
+      })).join('; ');
+    }).join(', ');
+  }).join(', ');
+};
+
+module.exports = { format, parse };