Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 248 insertions, 0 deletions

diff --git a/netwerk/protocol/http/CachePushChecker.cpp b/netwerk/protocol/http/CachePushChecker.cpp
new file mode 100644
index 0000000000..9f48aa7eda
--- /dev/null
+++ b/netwerk/protocol/http/CachePushChecker.cpp
@@ -0,0 +1,248 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et 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 "CachePushChecker.h"
+
+#include "LoadContextInfo.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/net/SocketProcessChild.h"
+#include "nsICacheEntry.h"
+#include "nsICacheStorageService.h"
+#include "nsICacheStorage.h"
+#include "nsThreadUtils.h"
+#include "CacheControlParser.h"
+#include "nsHttpHandler.h"
+
+namespace mozilla {
+namespace net {
+
+NS_IMPL_ISUPPORTS(CachePushChecker, nsICacheEntryOpenCallback);
+
+CachePushChecker::CachePushChecker(nsIURI* aPushedURL,
+                                   const OriginAttributes& aOriginAttributes,
+                                   const nsACString& aRequestString,
+                                   std::function<void(bool)>&& aCallback)
+    : mPushedURL(aPushedURL),
+      mOriginAttributes(aOriginAttributes),
+      mRequestString(aRequestString),
+      mCallback(std::move(aCallback)),
+      mCurrentEventTarget(GetCurrentSerialEventTarget()) {}
+
+nsresult CachePushChecker::DoCheck() {
+  if (XRE_IsSocketProcess()) {
+    RefPtr<CachePushChecker> self = this;
+    return NS_DispatchToMainThread(
+        NS_NewRunnableFunction(
+            "CachePushChecker::DoCheck",
+            [self]() {
+              if (SocketProcessChild* child =
+                      SocketProcessChild::GetSingleton()) {
+                child
+                    ->SendCachePushCheck(self->mPushedURL,
+                                         self->mOriginAttributes,
+                                         self->mRequestString)
+                    ->Then(
+                        GetCurrentSerialEventTarget(), __func__,
+                        [self](bool aResult) { self->InvokeCallback(aResult); },
+                        [](const mozilla::ipc::ResponseRejectReason) {});
+              }
+            }),
+        NS_DISPATCH_NORMAL);
+  }
+
+  nsresult rv;
+  nsCOMPtr<nsICacheStorageService> css =
+      do_GetService("@mozilla.org/netwerk/cache-storage-service;1", &rv);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  RefPtr<LoadContextInfo> lci = GetLoadContextInfo(false, mOriginAttributes);
+  nsCOMPtr<nsICacheStorage> ds;
+  rv = css->DiskCacheStorage(lci, getter_AddRefs(ds));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return ds->AsyncOpenURI(
+      mPushedURL, ""_ns,
+      nsICacheStorage::OPEN_READONLY | nsICacheStorage::OPEN_SECRETLY, this);
+}
+
+NS_IMETHODIMP
+CachePushChecker::OnCacheEntryCheck(nsICacheEntry* entry, uint32_t* result) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  // We never care to fully open the entry, since we won't actually use it.
+  // We just want to be able to do all our checks to see if a future channel can
+  // use this entry, or if we need to accept the push.
+  *result = nsICacheEntryOpenCallback::ENTRY_NOT_WANTED;
+
+  bool isForcedValid = false;
+  entry->GetIsForcedValid(&isForcedValid);
+
+  nsHttpRequestHead requestHead;
+  requestHead.ParseHeaderSet(mRequestString.BeginReading());
+  nsHttpResponseHead cachedResponseHead;
+  bool acceptPush = true;
+  auto onExitGuard = MakeScopeExit([&] { InvokeCallback(acceptPush); });
+
+  nsresult rv =
+      nsHttp::GetHttpResponseHeadFromCacheEntry(entry, &cachedResponseHead);
+  if (NS_FAILED(rv)) {
+    // Couldn't make sense of what's in the cache entry, go ahead and accept
+    // the push.
+    return NS_OK;
+  }
+
+  if ((cachedResponseHead.Status() / 100) != 2) {
+    // Assume the push is sending us a success, while we don't have one in the
+    // cache, so we'll accept the push.
+    return NS_OK;
+  }
+
+  // Get the method that was used to generate the cached response
+  nsCString buf;
+  rv = entry->GetMetaDataElement("request-method", getter_Copies(buf));
+  if (NS_FAILED(rv)) {
+    // Can't check request method, accept the push
+    return NS_OK;
+  }
+  nsAutoCString pushedMethod;
+  requestHead.Method(pushedMethod);
+  if (!buf.Equals(pushedMethod)) {
+    // Methods don't match, accept the push
+    return NS_OK;
+  }
+
+  int64_t size, contentLength;
+  rv = nsHttp::CheckPartial(entry, &size, &contentLength, &cachedResponseHead);
+  if (NS_FAILED(rv)) {
+    // Couldn't figure out if this was partial or not, accept the push.
+    return NS_OK;
+  }
+
+  if (size == int64_t(-1) || contentLength != size) {
+    // This is partial content in the cache, accept the push.
+    return NS_OK;
+  }
+
+  nsAutoCString requestedETag;
+  if (NS_FAILED(requestHead.GetHeader(nsHttp::If_Match, requestedETag))) {
+    // Can't check etag
+    return NS_OK;
+  }
+  if (!requestedETag.IsEmpty()) {
+    nsAutoCString cachedETag;
+    if (NS_FAILED(cachedResponseHead.GetHeader(nsHttp::ETag, cachedETag))) {
+      // Can't check etag
+      return NS_OK;
+    }
+    if (!requestedETag.Equals(cachedETag)) {
+      // ETags don't match, accept the push.
+      return NS_OK;
+    }
+  }
+
+  nsAutoCString imsString;
+  Unused << requestHead.GetHeader(nsHttp::If_Modified_Since, imsString);
+  if (!buf.IsEmpty()) {
+    uint32_t ims = buf.ToInteger(&rv);
+    uint32_t lm;
+    rv = cachedResponseHead.GetLastModifiedValue(&lm);
+    if (NS_SUCCEEDED(rv) && lm && lm < ims) {
+      // The push appears to be newer than what's in our cache, accept it.
+      return NS_OK;
+    }
+  }
+
+  nsAutoCString cacheControlRequestHeader;
+  Unused << requestHead.GetHeader(nsHttp::Cache_Control,
+                                  cacheControlRequestHeader);
+  CacheControlParser cacheControlRequest(cacheControlRequestHeader);
+  if (cacheControlRequest.NoStore()) {
+    // Don't use a no-store cache entry, accept the push.
+    return NS_OK;
+  }
+
+  nsCString cachedAuth;
+  rv = entry->GetMetaDataElement("auth", getter_Copies(cachedAuth));
+  if (NS_SUCCEEDED(rv)) {
+    uint32_t lastModifiedTime;
+    rv = entry->GetLastModified(&lastModifiedTime);
+    if (NS_SUCCEEDED(rv)) {
+      if ((gHttpHandler->SessionStartTime() > lastModifiedTime) &&
+          !cachedAuth.IsEmpty()) {
+        // Need to revalidate this, as the auth is old. Accept the push.
+        return NS_OK;
+      }
+
+      if (cachedAuth.IsEmpty() &&
+          requestHead.HasHeader(nsHttp::Authorization)) {
+        // They're pushing us something with auth, but we didn't cache anything
+        // with auth. Accept the push.
+        return NS_OK;
+      }
+    }
+  }
+
+  bool weaklyFramed, isImmutable;
+  nsHttp::DetermineFramingAndImmutability(entry, &cachedResponseHead, true,
+                                          &weaklyFramed, &isImmutable);
+
+  // We'll need this value in later computations...
+  uint32_t lastModifiedTime;
+  rv = entry->GetLastModified(&lastModifiedTime);
+  if (NS_FAILED(rv)) {
+    // Ugh, this really sucks. OK, accept the push.
+    return NS_OK;
+  }
+
+  // Determine if this is the first time that this cache entry
+  // has been accessed during this session.
+  bool fromPreviousSession =
+      (gHttpHandler->SessionStartTime() > lastModifiedTime);
+
+  bool validationRequired = nsHttp::ValidationRequired(
+      isForcedValid, &cachedResponseHead, 0 /*NWGH: ??? - loadFlags*/, false,
+      false /* forceValidateCacheContent */, isImmutable, false, requestHead,
+      entry, cacheControlRequest, fromPreviousSession);
+
+  if (validationRequired) {
+    // A real channel would most likely hit the net at this point, so let's
+    // accept the push.
+    return NS_OK;
+  }
+
+  // If we get here, then we would be able to use this cache entry. Cancel the
+  // push so as not to waste any more bandwidth.
+  acceptPush = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+CachePushChecker::OnCacheEntryAvailable(nsICacheEntry* entry, bool isNew,
+                                        nsresult result) {
+  // Nothing to do here, all the work is in OnCacheEntryCheck.
+  return NS_OK;
+}
+
+void CachePushChecker::InvokeCallback(bool aResult) {
+  RefPtr<CachePushChecker> self = this;
+  auto task = [self, aResult]() { self->mCallback(aResult); };
+  if (!mCurrentEventTarget->IsOnCurrentThread()) {
+    mCurrentEventTarget->Dispatch(
+        NS_NewRunnableFunction("CachePushChecker::InvokeCallback",
+                               std::move(task)),
+        NS_DISPATCH_NORMAL);
+    return;
+  }
+
+  task();
+}
+
+}  // namespace net
+}  // namespace mozilla