1 files changed, 110 insertions, 0 deletions
diff --git a/netwerk/protocol/http/nsServerTiming.cpp b/netwerk/protocol/http/nsServerTiming.cpp
new file mode 100644
index 0000000000..b1b2fe54d1
--- /dev/null
+++ b/netwerk/protocol/http/nsServerTiming.cpp
@@ -0,0 +1,110 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsServerTiming.h"
+
+#include "nsHttp.h"
+
+NS_IMPL_ISUPPORTS(nsServerTiming, nsIServerTiming)
+
+NS_IMETHODIMP
+nsServerTiming::GetName(nsACString& aName) {
+  aName.Assign(mName);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsServerTiming::GetDuration(double* aDuration) {
+  *aDuration = mDuration;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsServerTiming::GetDescription(nsACString& aDescription) {
+  aDescription.Assign(mDescription);
+  return NS_OK;
+}
+
+namespace mozilla {
+namespace net {
+
+static double ParseDouble(const nsACString& aString) {
+  nsresult rv;
+  double val = PromiseFlatCString(aString).ToDouble(&rv);
+  return NS_FAILED(rv) ? 0.0f : val;
+}
+
+void ServerTimingParser::Parse() {
+  // https://w3c.github.io/server-timing/#the-server-timing-header-field
+  // Server-Timing             = #server-timing-metric
+  // server-timing-metric      = metric-name *( OWS ";" OWS server-timing-param
+  // ) metric-name               = token server-timing-param       =
+  // server-timing-param-name OWS "=" OWS
+  //                             server-timing-param-value
+  // server-timing-param-name  = token
+  // server-timing-param-value = token / quoted-string
+
+  ParsedHeaderValueListList parsedHeader(mValue, false);
+  for (uint32_t index = 0; index < parsedHeader.mValues.Length(); ++index) {
+    if (parsedHeader.mValues[index].mValues.IsEmpty()) {
+      continue;
+    }
+
+    // According to spec, the first ParsedHeaderPair's name is metric-name.
+    RefPtr<nsServerTiming> timingHeader = new nsServerTiming();
+    mServerTimingHeaders.AppendElement(timingHeader);
+    timingHeader->SetName(parsedHeader.mValues[index].mValues[0].mName);
+
+    if (parsedHeader.mValues[index].mValues.Length() == 1) {
+      continue;
+    }
+
+    // Try to find duration and description from the rest ParsedHeaderPairs.
+    bool foundDuration = false;
+    bool foundDescription = false;
+    for (uint32_t pairIndex = 1;
+         pairIndex < parsedHeader.mValues[index].mValues.Length();
+         ++pairIndex) {
+      nsDependentCSubstring& currentName =
+          parsedHeader.mValues[index].mValues[pairIndex].mName;
+      nsDependentCSubstring& currentValue =
+          parsedHeader.mValues[index].mValues[pairIndex].mValue;
+
+      // We should only take the value from the first
+      // occurrence of server-timing-param-name ("dur" and "desc").
+      // This is true whether or not the value makes any sense (or, indeed, if
+      // there even is a value).
+      if (currentName.LowerCaseEqualsASCII("dur") && !foundDuration) {
+        if (currentValue.BeginReading()) {
+          timingHeader->SetDuration(ParseDouble(currentValue));
+        } else {
+          timingHeader->SetDuration(0.0);
+        }
+        foundDuration = true;
+      } else if (currentName.LowerCaseEqualsASCII("desc") &&
+                 !foundDescription) {
+        if (!currentValue.IsEmpty()) {
+          timingHeader->SetDescription(currentValue);
+        } else {
+          timingHeader->SetDescription(""_ns);
+        }
+        foundDescription = true;
+      }
+
+      if (foundDuration && foundDescription) {
+        break;
+      }
+    }
+  }
+}
+
+nsTArray<nsCOMPtr<nsIServerTiming>>&&
+ServerTimingParser::TakeServerTimingHeaders() {
+  return std::move(mServerTimingHeaders);
+}
+
+}  // namespace net
+}  // namespace mozilla