1 files changed, 70 insertions, 0 deletions
diff --git a/node_modules/ws/lib/Extensions.js b/node_modules/ws/lib/Extensions.js
new file mode 100644
index 000000000..a465ace2b
--- /dev/null
+++ b/node_modules/ws/lib/Extensions.js
@@ -0,0 +1,70 @@
+
+var util = require('util');
+
+/**
+ * Module exports.
+ */
+
+exports.parse = parse;
+exports.format = format;
+
+/**
+ * Parse extensions header value
+ */
+
+function parse(value) {
+  value = value || '';
+
+  var extensions = {};
+
+  value.split(',').forEach(function(v) {
+    var params = v.split(';');
+    var token = params.shift().trim();
+    var paramsList = extensions[token] = extensions[token] || [];
+    var parsedParams = {};
+
+    params.forEach(function(param) {
+      var parts = param.trim().split('=');
+      var key = parts[0];
+      var value = parts[1];
+      if (typeof 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;
+}
+
+/**
+ * Format extensions header value
+ */
+
+function format(value) {
+  return Object.keys(value).map(function(token) {
+    var paramsList = value[token];
+    if (!util.isArray(paramsList)) {
+      paramsList = [paramsList];
+    }
+    return paramsList.map(function(params) {
+      return [token].concat(Object.keys(params).map(function(k) {
+        var p = params[k];
+        if (!util.isArray(p)) p = [p];
+        return p.map(function(v) {
+          return v === true ? k : k + '=' + v;
+        }).join('; ');
+      })).join('; ');
+    }).join(', ');
+  }).join(', ');
+}