image/imgRequest.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "imgRequest.h"
   8 #include "ImageLogging.h"
   9
  10 #include "imgLoader.h"
  11 #include "imgRequestProxy.h"
  12 #include "DecodePool.h"
  13 #include "ProgressTracker.h"
  14 #include "ImageFactory.h"
  15 #include "Image.h"
  16 #include "MultipartImage.h"
  17 #include "RasterImage.h"
  18
  19 #include "nsIChannel.h"
  20 #include "nsICacheInfoChannel.h"
  21 #include "nsIClassOfService.h"
  22 #include "mozilla/dom/Document.h"
  23 #include "nsIThreadRetargetableRequest.h"
  24 #include "nsIInputStream.h"
  25 #include "nsIMultiPartChannel.h"
  26 #include "nsIHttpChannel.h"
  27 #include "nsMimeTypes.h"
  28
  29 #include "nsIInterfaceRequestorUtils.h"
  30 #include "nsISupportsPrimitives.h"
  31 #include "nsIScriptSecurityManager.h"
  32 #include "nsComponentManagerUtils.h"
  33 #include "nsContentUtils.h"
  34 #include "nsEscape.h"
  35
  36 #include "prtime.h"  // for PR_Now
  37 #include "nsNetUtil.h"
  38 #include "nsIProtocolHandler.h"
  39 #include "imgIRequest.h"
  40 #include "nsProperties.h"
  41 #include "nsIURL.h"
  42
  43 #include "mozilla/IntegerPrintfMacros.h"
  44 #include "mozilla/SizeOfState.h"
  45
  46 using namespace mozilla;
  47 using namespace mozilla::image;
  48
  49 #define LOG_TEST(level) (MOZ_LOG_TEST(gImgLog, (level)))
  50
  51 NS_IMPL_ISUPPORTS(imgRequest, nsIStreamListener, nsIRequestObserver,
  52                   nsIThreadRetargetableStreamListener, nsIChannelEventSink,
  53                   nsIInterfaceRequestor, nsIAsyncVerifyRedirectCallback)
  54
  55 imgRequest::imgRequest(imgLoader* aLoader, const ImageCacheKey& aCacheKey)
  56     : mLoader(aLoader),
  57       mCacheKey(aCacheKey),
  58       mLoadId(nullptr),
  59       mFirstProxy(nullptr),
  60       mValidator(nullptr),
  61       mCORSMode(CORS_NONE),
  62       mImageErrorCode(NS_OK),
  63       mImageAvailable(false),
  64       mIsDeniedCrossSiteCORSRequest(false),
  65       mIsCrossSiteNoCORSRequest(false),
  66       mMutex("imgRequest"),
  67       mProgressTracker(new ProgressTracker()),
  68       mIsMultiPartChannel(false),
  69       mIsInCache(false),
  70       mDecodeRequested(false),
  71       mNewPartPending(false),
  72       mHadInsecureRedirect(false),
  73       mInnerWindowId(0) {
  74   LOG_FUNC(gImgLog, "imgRequest::imgRequest()");
  75 }
  76
  77 imgRequest::~imgRequest() {
  78   if (mLoader) {
  79     mLoader->RemoveFromUncachedImages(this);
  80   }
  81   if (mURI) {
  82     LOG_FUNC_WITH_PARAM(gImgLog, "imgRequest::~imgRequest()", "keyuri", mURI);
  83   } else
  84     LOG_FUNC(gImgLog, "imgRequest::~imgRequest()");
  85 }
  86
  87 nsresult imgRequest::Init(
  88     nsIURI* aURI, nsIURI* aFinalURI, bool aHadInsecureRedirect,
  89     nsIRequest* aRequest, nsIChannel* aChannel, imgCacheEntry* aCacheEntry,
  90     mozilla::dom::Document* aLoadingDocument,
  91     nsIPrincipal* aTriggeringPrincipal, mozilla::CORSMode aCORSMode,
  92     nsIReferrerInfo* aReferrerInfo) MOZ_NO_THREAD_SAFETY_ANALYSIS {
  93   MOZ_ASSERT(NS_IsMainThread(), "Cannot use nsIURI off main thread!");
  94   // Init() can only be called once, and that's before it can be used off
  95   // mainthread
  96
  97   LOG_FUNC(gImgLog, "imgRequest::Init");
  98
  99   MOZ_ASSERT(!mImage, "Multiple calls to init");
 100   MOZ_ASSERT(aURI, "No uri");
 101   MOZ_ASSERT(aFinalURI, "No final uri");
 102   MOZ_ASSERT(aRequest, "No request");
 103   MOZ_ASSERT(aChannel, "No channel");
 104
 105   mProperties = new nsProperties();
 106   mURI = aURI;
 107   mFinalURI = aFinalURI;
 108   mRequest = aRequest;
 109   mChannel = aChannel;
 110   mTimedChannel = do_QueryInterface(mChannel);
 111   mTriggeringPrincipal = aTriggeringPrincipal;
 112   mCORSMode = aCORSMode;
 113   mReferrerInfo = aReferrerInfo;
 114
 115   // If the original URI and the final URI are different, check whether the
 116   // original URI is secure. We deliberately don't take the final URI into
 117   // account, as it needs to be handled using more complicated rules than
 118   // earlier elements of the redirect chain.
 119   if (aURI != aFinalURI) {
 120     bool schemeLocal = false;
 121     if (NS_FAILED(NS_URIChainHasFlags(
 122             aURI, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE, &schemeLocal)) ||
 123         (!aURI->SchemeIs("https") && !aURI->SchemeIs("chrome") &&
 124          !schemeLocal)) {
 125       mHadInsecureRedirect = true;
 126     }
 127   }
 128
 129   // imgCacheValidator may have handled redirects before we were created, so we
 130   // allow the caller to let us know if any redirects were insecure.
 131   mHadInsecureRedirect = mHadInsecureRedirect || aHadInsecureRedirect;
 132
 133   mChannel->GetNotificationCallbacks(getter_AddRefs(mPrevChannelSink));
 134
 135   NS_ASSERTION(mPrevChannelSink != this,
 136                "Initializing with a channel that already calls back to us!");
 137
 138   mChannel->SetNotificationCallbacks(this);
 139
 140   mCacheEntry = aCacheEntry;
 141   mCacheEntry->UpdateLoadTime();
 142
 143   SetLoadId(aLoadingDocument);
 144
 145   // Grab the inner window ID of the loading document, if possible.
 146   if (aLoadingDocument) {
 147     mInnerWindowId = aLoadingDocument->InnerWindowID();
 148   }
 149
 150   return NS_OK;
 151 }
 152
 153 bool imgRequest::CanReuseWithoutValidation(dom::Document* aDoc) const {
 154   // If the request's loadId is the same as the aLoadingDocument, then it is ok
 155   // to use this one because it has already been validated for this context.
 156   // XXX: nullptr seems to be a 'special' key value that indicates that NO
 157   //      validation is required.
 158   // XXX: we also check the window ID because the loadID() can return a reused
 159   //      pointer of a document. This can still happen for non-document image
 160   //      cache entries.
 161   void* key = (void*)aDoc;
 162   uint64_t innerWindowID = aDoc ? aDoc->InnerWindowID() : 0;
 163   if (LoadId() == key && InnerWindowID() == innerWindowID) {
 164     return true;
 165   }
 166
 167   // As a special-case, if this is a print preview document, also validate on
 168   // the original document. This allows to print uncacheable images.
 169   if (dom::Document* original = aDoc ? aDoc->GetOriginalDocument() : nullptr) {
 170     return CanReuseWithoutValidation(original);
 171   }
 172
 173   return false;
 174 }
 175
 176 void imgRequest::ClearLoader() { mLoader = nullptr; }
 177
 178 already_AddRefed<nsIPrincipal> imgRequest::GetTriggeringPrincipal() const {
 179   nsCOMPtr<nsIPrincipal> principal = mTriggeringPrincipal;
 180   return principal.forget();
 181 }
 182
 183 already_AddRefed<ProgressTracker> imgRequest::GetProgressTracker() const {
 184   MutexAutoLock lock(mMutex);
 185
 186   if (mImage) {
 187     MOZ_ASSERT(!mProgressTracker,
 188                "Should have given mProgressTracker to mImage");
 189     return mImage->GetProgressTracker();
 190   }
 191   MOZ_ASSERT(mProgressTracker,
 192              "Should have mProgressTracker until we create mImage");
 193   RefPtr<ProgressTracker> progressTracker = mProgressTracker;
 194   MOZ_ASSERT(progressTracker);
 195   return progressTracker.forget();
 196 }
 197
 198 void imgRequest::SetCacheEntry(imgCacheEntry* entry) { mCacheEntry = entry; }
 199
 200 bool imgRequest::HasCacheEntry() const { return mCacheEntry != nullptr; }
 201
 202 void imgRequest::ResetCacheEntry() {
 203   if (HasCacheEntry()) {
 204     mCacheEntry->SetDataSize(0);
 205   }
 206 }
 207
 208 void imgRequest::AddProxy(imgRequestProxy* proxy) {
 209   MOZ_ASSERT(proxy, "null imgRequestProxy passed in");
 210   LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::AddProxy", "proxy", proxy);
 211
 212   if (!mFirstProxy) {
 213     // Save a raw pointer to the first proxy we see, for use in the network
 214     // priority logic.
 215     mFirstProxy = proxy;
 216   }
 217
 218   // If we're empty before adding, we have to tell the loader we now have
 219   // proxies.
 220   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 221   if (progressTracker->ObserverCount() == 0) {
 222     MOZ_ASSERT(mURI, "Trying to SetHasProxies without key uri.");
 223     if (mLoader) {
 224       mLoader->SetHasProxies(this);
 225     }
 226   }
 227
 228   progressTracker->AddObserver(proxy);
 229 }
 230
 231 nsresult imgRequest::RemoveProxy(imgRequestProxy* proxy, nsresult aStatus) {
 232   LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::RemoveProxy", "proxy", proxy);
 233
 234   // This will remove our animation consumers, so after removing
 235   // this proxy, we don't end up without proxies with observers, but still
 236   // have animation consumers.
 237   proxy->ClearAnimationConsumers();
 238
 239   // Let the status tracker do its thing before we potentially call Cancel()
 240   // below, because Cancel() may result in OnStopRequest being called back
 241   // before Cancel() returns, leaving the image in a different state then the
 242   // one it was in at this point.
 243   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 244   if (!progressTracker->RemoveObserver(proxy)) {
 245     return NS_OK;
 246   }
 247
 248   if (progressTracker->ObserverCount() == 0) {
 249     // If we have no observers, there's nothing holding us alive. If we haven't
 250     // been cancelled and thus removed from the cache, tell the image loader so
 251     // we can be evicted from the cache.
 252     if (mCacheEntry) {
 253       MOZ_ASSERT(mURI, "Removing last observer without key uri.");
 254
 255       if (mLoader) {
 256         mLoader->SetHasNoProxies(this, mCacheEntry);
 257       }
 258     } else {
 259       LOG_MSG_WITH_PARAM(gImgLog, "imgRequest::RemoveProxy no cache entry",
 260                          "uri", mURI);
 261     }
 262
 263     /* If |aStatus| is a failure code, then cancel the load if it is still in
 264        progress.  Otherwise, let the load continue, keeping 'this' in the cache
 265        with no observers.  This way, if a proxy is destroyed without calling
 266        cancel on it, it won't leak and won't leave a bad pointer in the observer
 267        list.
 268      */
 269     if (!(progressTracker->GetProgress() & FLAG_LAST_PART_COMPLETE) &&
 270         NS_FAILED(aStatus)) {
 271       LOG_MSG(gImgLog, "imgRequest::RemoveProxy",
 272               "load in progress.  canceling");
 273
 274       this->Cancel(NS_BINDING_ABORTED);
 275     }
 276
 277     /* break the cycle from the cache entry. */
 278     mCacheEntry = nullptr;
 279   }
 280
 281   return NS_OK;
 282 }
 283
 284 uint64_t imgRequest::InnerWindowID() const {
 285   MutexAutoLock lock(mMutex);
 286   return mInnerWindowId;
 287 }
 288
 289 void imgRequest::SetInnerWindowID(uint64_t aInnerWindowId) {
 290   MutexAutoLock lock(mMutex);
 291   mInnerWindowId = aInnerWindowId;
 292 }
 293
 294 void imgRequest::CancelAndAbort(nsresult aStatus) {
 295   LOG_SCOPE(gImgLog, "imgRequest::CancelAndAbort");
 296
 297   Cancel(aStatus);
 298
 299   // It's possible for the channel to fail to open after we've set our
 300   // notification callbacks. In that case, make sure to break the cycle between
 301   // the channel and us, because it won't.
 302   if (mChannel) {
 303     mChannel->SetNotificationCallbacks(mPrevChannelSink);
 304     mPrevChannelSink = nullptr;
 305   }
 306 }
 307
 308 class imgRequestMainThreadCancel : public Runnable {
 309  public:
 310   imgRequestMainThreadCancel(imgRequest* aImgRequest, nsresult aStatus)
 311       : Runnable("imgRequestMainThreadCancel"),
 312         mImgRequest(aImgRequest),
 313         mStatus(aStatus) {
 314     MOZ_ASSERT(!NS_IsMainThread(), "Create me off main thread only!");
 315     MOZ_ASSERT(aImgRequest);
 316   }
 317
 318   NS_IMETHOD Run() override {
 319     MOZ_ASSERT(NS_IsMainThread(), "I should be running on the main thread!");
 320     mImgRequest->ContinueCancel(mStatus);
 321     return NS_OK;
 322   }
 323
 324  private:
 325   RefPtr<imgRequest> mImgRequest;
 326   nsresult mStatus;
 327 };
 328
 329 void imgRequest::Cancel(nsresult aStatus) {
 330   /* The Cancel() method here should only be called by this class. */
 331   LOG_SCOPE(gImgLog, "imgRequest::Cancel");
 332
 333   if (NS_IsMainThread()) {
 334     ContinueCancel(aStatus);
 335   } else {
 336     RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 337     nsCOMPtr<nsIEventTarget> eventTarget = progressTracker->GetEventTarget();
 338     nsCOMPtr<nsIRunnable> ev = new imgRequestMainThreadCancel(this, aStatus);
 339     eventTarget->Dispatch(ev.forget(), NS_DISPATCH_NORMAL);
 340   }
 341 }
 342
 343 void imgRequest::ContinueCancel(nsresult aStatus) {
 344   MOZ_ASSERT(NS_IsMainThread());
 345
 346   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 347   progressTracker->SyncNotifyProgress(FLAG_HAS_ERROR);
 348
 349   RemoveFromCache();
 350
 351   if (mRequest && !(progressTracker->GetProgress() & FLAG_LAST_PART_COMPLETE)) {
 352     mRequest->CancelWithReason(aStatus, "imgRequest::ContinueCancel"_ns);
 353   }
 354 }
 355
 356 class imgRequestMainThreadEvict : public Runnable {
 357  public:
 358   explicit imgRequestMainThreadEvict(imgRequest* aImgRequest)
 359       : Runnable("imgRequestMainThreadEvict"), mImgRequest(aImgRequest) {
 360     MOZ_ASSERT(!NS_IsMainThread(), "Create me off main thread only!");
 361     MOZ_ASSERT(aImgRequest);
 362   }
 363
 364   NS_IMETHOD Run() override {
 365     MOZ_ASSERT(NS_IsMainThread(), "I should be running on the main thread!");
 366     mImgRequest->ContinueEvict();
 367     return NS_OK;
 368   }
 369
 370  private:
 371   RefPtr<imgRequest> mImgRequest;
 372 };
 373
 374 // EvictFromCache() is written to allowed to get called from any thread
 375 void imgRequest::EvictFromCache() {
 376   /* The EvictFromCache() method here should only be called by this class. */
 377   LOG_SCOPE(gImgLog, "imgRequest::EvictFromCache");
 378
 379   if (NS_IsMainThread()) {
 380     ContinueEvict();
 381   } else {
 382     NS_DispatchToMainThread(new imgRequestMainThreadEvict(this));
 383   }
 384 }
 385
 386 // Helper-method used by EvictFromCache()
 387 void imgRequest::ContinueEvict() {
 388   MOZ_ASSERT(NS_IsMainThread());
 389
 390   RemoveFromCache();
 391 }
 392
 393 void imgRequest::StartDecoding() {
 394   MutexAutoLock lock(mMutex);
 395   mDecodeRequested = true;
 396 }
 397
 398 bool imgRequest::IsDecodeRequested() const {
 399   MutexAutoLock lock(mMutex);
 400   return mDecodeRequested;
 401 }
 402
 403 nsresult imgRequest::GetURI(nsIURI** aURI) {
 404   MOZ_ASSERT(aURI);
 405
 406   LOG_FUNC(gImgLog, "imgRequest::GetURI");
 407
 408   if (mURI) {
 409     *aURI = mURI;
 410     NS_ADDREF(*aURI);
 411     return NS_OK;
 412   }
 413
 414   return NS_ERROR_FAILURE;
 415 }
 416
 417 nsresult imgRequest::GetFinalURI(nsIURI** aURI) {
 418   MOZ_ASSERT(aURI);
 419
 420   LOG_FUNC(gImgLog, "imgRequest::GetFinalURI");
 421
 422   if (mFinalURI) {
 423     *aURI = mFinalURI;
 424     NS_ADDREF(*aURI);
 425     return NS_OK;
 426   }
 427
 428   return NS_ERROR_FAILURE;
 429 }
 430
 431 bool imgRequest::IsChrome() const { return mURI->SchemeIs("chrome"); }
 432
 433 bool imgRequest::IsData() const { return mURI->SchemeIs("data"); }
 434
 435 nsresult imgRequest::GetImageErrorCode() { return mImageErrorCode; }
 436
 437 void imgRequest::RemoveFromCache() {
 438   LOG_SCOPE(gImgLog, "imgRequest::RemoveFromCache");
 439
 440   bool isInCache = false;
 441
 442   {
 443     MutexAutoLock lock(mMutex);
 444     isInCache = mIsInCache;
 445   }
 446
 447   if (isInCache && mLoader) {
 448     // mCacheEntry is nulled out when we have no more observers.
 449     if (mCacheEntry) {
 450       mLoader->RemoveFromCache(mCacheEntry);
 451     } else {
 452       mLoader->RemoveFromCache(mCacheKey);
 453     }
 454   }
 455
 456   mCacheEntry = nullptr;
 457 }
 458
 459 bool imgRequest::HasConsumers() const {
 460   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 461   return progressTracker && progressTracker->ObserverCount() > 0;
 462 }
 463
 464 already_AddRefed<image::Image> imgRequest::GetImage() const {
 465   MutexAutoLock lock(mMutex);
 466   RefPtr<image::Image> image = mImage;
 467   return image.forget();
 468 }
 469
 470 void imgRequest::GetFileName(nsACString& aFileName) {
 471   nsAutoString fileName;
 472
 473   nsCOMPtr<nsISupportsCString> supportscstr;
 474   if (NS_SUCCEEDED(mProperties->Get("content-disposition",
 475                                     NS_GET_IID(nsISupportsCString),
 476                                     getter_AddRefs(supportscstr))) &&
 477       supportscstr) {
 478     nsAutoCString cdHeader;
 479     supportscstr->GetData(cdHeader);
 480     NS_GetFilenameFromDisposition(fileName, cdHeader);
 481   }
 482
 483   if (fileName.IsEmpty()) {
 484     nsCOMPtr<nsIURL> imgUrl(do_QueryInterface(mURI));
 485     if (imgUrl) {
 486       imgUrl->GetFileName(aFileName);
 487       NS_UnescapeURL(aFileName);
 488     }
 489   } else {
 490     aFileName = NS_ConvertUTF16toUTF8(fileName);
 491   }
 492 }
 493
 494 int32_t imgRequest::Priority() const {
 495   int32_t priority = nsISupportsPriority::PRIORITY_NORMAL;
 496   nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(mRequest);
 497   if (p) {
 498     p->GetPriority(&priority);
 499   }
 500   return priority;
 501 }
 502
 503 void imgRequest::AdjustPriority(imgRequestProxy* proxy, int32_t delta) {
 504   // only the first proxy is allowed to modify the priority of this image load.
 505   //
 506   // XXX(darin): this is probably not the most optimal algorithm as we may want
 507   // to increase the priority of requests that have a lot of proxies.  the key
 508   // concern though is that image loads remain lower priority than other pieces
 509   // of content such as link clicks, CSS, and JS.
 510   //
 511   if (!mFirstProxy || proxy != mFirstProxy) {
 512     return;
 513   }
 514
 515   AdjustPriorityInternal(delta);
 516 }
 517
 518 void imgRequest::AdjustPriorityInternal(int32_t aDelta) {
 519   nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(mChannel);
 520   if (p) {
 521     p->AdjustPriority(aDelta);
 522   }
 523 }
 524
 525 void imgRequest::BoostPriority(uint32_t aCategory) {
 526   if (!StaticPrefs::image_layout_network_priority()) {
 527     return;
 528   }
 529
 530   uint32_t newRequestedCategory =
 531       (mBoostCategoriesRequested & aCategory) ^ aCategory;
 532   if (!newRequestedCategory) {
 533     // priority boost for each category can only apply once.
 534     return;
 535   }
 536
 537   MOZ_LOG(gImgLog, LogLevel::Debug,
 538           ("[this=%p] imgRequest::BoostPriority for category %x", this,
 539            newRequestedCategory));
 540
 541   int32_t delta = 0;
 542
 543   if (newRequestedCategory & imgIRequest::CATEGORY_FRAME_INIT) {
 544     --delta;
 545   }
 546
 547   if (newRequestedCategory & imgIRequest::CATEGORY_FRAME_STYLE) {
 548     --delta;
 549   }
 550
 551   if (newRequestedCategory & imgIRequest::CATEGORY_SIZE_QUERY) {
 552     --delta;
 553   }
 554
 555   if (newRequestedCategory & imgIRequest::CATEGORY_DISPLAY) {
 556     delta += nsISupportsPriority::PRIORITY_HIGH;
 557   }
 558
 559   AdjustPriorityInternal(delta);
 560   mBoostCategoriesRequested |= newRequestedCategory;
 561 }
 562
 563 void imgRequest::SetIsInCache(bool aInCache) {
 564   LOG_FUNC_WITH_PARAM(gImgLog, "imgRequest::SetIsCacheable", "aInCache",
 565                       aInCache);
 566   MutexAutoLock lock(mMutex);
 567   mIsInCache = aInCache;
 568 }
 569
 570 void imgRequest::UpdateCacheEntrySize() {
 571   if (!mCacheEntry) {
 572     return;
 573   }
 574
 575   RefPtr<Image> image = GetImage();
 576   SizeOfState state(moz_malloc_size_of);
 577   size_t size = image->SizeOfSourceWithComputedFallback(state);
 578   mCacheEntry->SetDataSize(size);
 579 }
 580
 581 void imgRequest::SetCacheValidation(imgCacheEntry* aCacheEntry,
 582                                     nsIRequest* aRequest) {
 583   /* get the expires info */
 584   if (!aCacheEntry || aCacheEntry->GetExpiryTime() != 0) {
 585     return;
 586   }
 587
 588   RefPtr<imgRequest> req = aCacheEntry->GetRequest();
 589   MOZ_ASSERT(req);
 590   RefPtr<nsIURI> uri;
 591   req->GetURI(getter_AddRefs(uri));
 592   // TODO(emilio): Seems we should be able to assert `uri` is not null, but we
 593   // get here in such cases sometimes (like for some redirects, see
 594   // docshell/test/chrome/test_bug89419.xhtml).
 595   //
 596   // We have the original URI in the cache key though, probably we should be
 597   // using that instead of relying on Init() getting called.
 598   auto info = nsContentUtils::GetSubresourceCacheValidationInfo(aRequest, uri);
 599
 600   // Expiration time defaults to 0. We set the expiration time on our entry if
 601   // it hasn't been set yet.
 602   if (!info.mExpirationTime) {
 603     // If the channel doesn't support caching, then ensure this expires the
 604     // next time it is used.
 605     info.mExpirationTime.emplace(nsContentUtils::SecondsFromPRTime(PR_Now()) -
 606                                  1);
 607   }
 608   aCacheEntry->SetExpiryTime(*info.mExpirationTime);
 609   // Cache entries default to not needing to validate. We ensure that
 610   // multiple calls to this function don't override an earlier decision to
 611   // validate by making validation a one-way decision.
 612   if (info.mMustRevalidate) {
 613     aCacheEntry->SetMustValidate(info.mMustRevalidate);
 614   }
 615 }
 616
 617 bool imgRequest::GetMultipart() const {
 618   MutexAutoLock lock(mMutex);
 619   return mIsMultiPartChannel;
 620 }
 621
 622 bool imgRequest::HadInsecureRedirect() const {
 623   MutexAutoLock lock(mMutex);
 624   return mHadInsecureRedirect;
 625 }
 626
 627 /** nsIRequestObserver methods **/
 628
 629 NS_IMETHODIMP
 630 imgRequest::OnStartRequest(nsIRequest* aRequest) {
 631   LOG_SCOPE(gImgLog, "imgRequest::OnStartRequest");
 632
 633   RefPtr<Image> image;
 634
 635   if (nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest)) {
 636     nsresult rv;
 637     nsCOMPtr<nsILoadInfo> loadInfo = httpChannel->LoadInfo();
 638     mIsDeniedCrossSiteCORSRequest =
 639         loadInfo->GetTainting() == LoadTainting::CORS &&
 640         (NS_FAILED(httpChannel->GetStatus(&rv)) || NS_FAILED(rv));
 641     mIsCrossSiteNoCORSRequest = loadInfo->GetTainting() == LoadTainting::Opaque;
 642   }
 643
 644   // Figure out if we're multipart.
 645   nsCOMPtr<nsIMultiPartChannel> multiPartChannel = do_QueryInterface(aRequest);
 646   {
 647     MutexAutoLock lock(mMutex);
 648
 649     MOZ_ASSERT(multiPartChannel || !mIsMultiPartChannel,
 650                "Stopped being multipart?");
 651
 652     mNewPartPending = true;
 653     image = mImage;
 654     mIsMultiPartChannel = bool(multiPartChannel);
 655   }
 656
 657   // If we're not multipart, we shouldn't have an image yet.
 658   if (image && !multiPartChannel) {
 659     MOZ_ASSERT_UNREACHABLE("Already have an image for a non-multipart request");
 660     Cancel(NS_IMAGELIB_ERROR_FAILURE);
 661     return NS_ERROR_FAILURE;
 662   }
 663
 664   /*
 665    * If mRequest is null here, then we need to set it so that we'll be able to
 666    * cancel it if our Cancel() method is called.  Note that this can only
 667    * happen for multipart channels.  We could simply not null out mRequest for
 668    * non-last parts, if GetIsLastPart() were reliable, but it's not.  See
 669    * https://bugzilla.mozilla.org/show_bug.cgi?id=339610
 670    */
 671   if (!mRequest) {
 672     MOZ_ASSERT(multiPartChannel, "Should have mRequest unless we're multipart");
 673     nsCOMPtr<nsIChannel> baseChannel;
 674     multiPartChannel->GetBaseChannel(getter_AddRefs(baseChannel));
 675     mRequest = baseChannel;
 676   }
 677
 678   nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
 679   if (channel) {
 680     /* Get our principal */
 681     nsCOMPtr<nsIScriptSecurityManager> secMan =
 682         nsContentUtils::GetSecurityManager();
 683     if (secMan) {
 684       nsresult rv = secMan->GetChannelResultPrincipal(
 685           channel, getter_AddRefs(mPrincipal));
 686       if (NS_FAILED(rv)) {
 687         return rv;
 688       }
 689     }
 690   }
 691
 692   SetCacheValidation(mCacheEntry, aRequest);
 693
 694   // Shouldn't we be dead already if this gets hit?
 695   // Probably multipart/x-mixed-replace...
 696   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 697   if (progressTracker->ObserverCount() == 0) {
 698     this->Cancel(NS_IMAGELIB_ERROR_FAILURE);
 699   }
 700
 701   // Try to retarget OnDataAvailable to a decode thread. We must process data
 702   // URIs synchronously as per the spec however.
 703   if (!channel || IsData()) {
 704     return NS_OK;
 705   }
 706
 707   nsCOMPtr<nsIThreadRetargetableRequest> retargetable =
 708       do_QueryInterface(aRequest);
 709   if (retargetable) {
 710     nsAutoCString mimeType;
 711     nsresult rv = channel->GetContentType(mimeType);
 712     if (NS_SUCCEEDED(rv) && !mimeType.EqualsLiteral(IMAGE_SVG_XML)) {
 713       // Retarget OnDataAvailable to the DecodePool's IO thread.
 714       nsCOMPtr<nsISerialEventTarget> target =
 715           DecodePool::Singleton()->GetIOEventTarget();
 716       rv = retargetable->RetargetDeliveryTo(target);
 717     }
 718     MOZ_LOG(gImgLog, LogLevel::Warning,
 719             ("[this=%p] imgRequest::OnStartRequest -- "
 720              "RetargetDeliveryTo rv %" PRIu32 "=%s\n",
 721              this, static_cast<uint32_t>(rv),
 722              NS_SUCCEEDED(rv) ? "succeeded" : "failed"));
 723   }
 724
 725   return NS_OK;
 726 }
 727
 728 NS_IMETHODIMP
 729 imgRequest::OnStopRequest(nsIRequest* aRequest, nsresult status) {
 730   LOG_FUNC(gImgLog, "imgRequest::OnStopRequest");
 731   MOZ_ASSERT(NS_IsMainThread(), "Can't send notifications off-main-thread");
 732
 733   RefPtr<Image> image = GetImage();
 734
 735   RefPtr<imgRequest> strongThis = this;
 736
 737   bool isMultipart = false;
 738   bool newPartPending = false;
 739   {
 740     MutexAutoLock lock(mMutex);
 741     isMultipart = mIsMultiPartChannel;
 742     newPartPending = mNewPartPending;
 743   }
 744   if (isMultipart && newPartPending) {
 745     OnDataAvailable(aRequest, nullptr, 0, 0);
 746   }
 747
 748   // XXXldb What if this is a non-last part of a multipart request?
 749   // xxx before we release our reference to mRequest, lets
 750   // save the last status that we saw so that the
 751   // imgRequestProxy will have access to it.
 752   if (mRequest) {
 753     mRequest = nullptr;  // we no longer need the request
 754   }
 755
 756   // stop holding a ref to the channel, since we don't need it anymore
 757   if (mChannel) {
 758     mChannel->SetNotificationCallbacks(mPrevChannelSink);
 759     mPrevChannelSink = nullptr;
 760     mChannel = nullptr;
 761   }
 762
 763   bool lastPart = true;
 764   nsCOMPtr<nsIMultiPartChannel> mpchan(do_QueryInterface(aRequest));
 765   if (mpchan) {
 766     mpchan->GetIsLastPart(&lastPart);
 767   }
 768
 769   bool isPartial = false;
 770   if (image && (status == NS_ERROR_NET_PARTIAL_TRANSFER)) {
 771     isPartial = true;
 772     status = NS_OK;  // fake happy face
 773   }
 774
 775   // Tell the image that it has all of the source data. Note that this can
 776   // trigger a failure, since the image might be waiting for more non-optional
 777   // data and this is the point where we break the news that it's not coming.
 778   if (image) {
 779     nsresult rv = image->OnImageDataComplete(aRequest, status, lastPart);
 780
 781     // If we got an error in the OnImageDataComplete() call, we don't want to
 782     // proceed as if nothing bad happened. However, we also want to give
 783     // precedence to failure status codes from necko, since presumably they're
 784     // more meaningful.
 785     if (NS_FAILED(rv) && NS_SUCCEEDED(status)) {
 786       status = rv;
 787     }
 788   }
 789
 790   // If the request went through, update the cache entry size. Otherwise,
 791   // cancel the request, which removes us from the cache.
 792   if (image && NS_SUCCEEDED(status) && !isPartial) {
 793     // We update the cache entry size here because this is where we finish
 794     // loading compressed source data, which is part of our size calculus.
 795     UpdateCacheEntrySize();
 796
 797   } else if (isPartial) {
 798     // Remove the partial image from the cache.
 799     this->EvictFromCache();
 800
 801   } else {
 802     mImageErrorCode = status;
 803
 804     // if the error isn't "just" a partial transfer
 805     // stops animations, removes from cache
 806     this->Cancel(status);
 807   }
 808
 809   if (!image) {
 810     // We have to fire the OnStopRequest notifications ourselves because there's
 811     // no image capable of doing so.
 812     Progress progress =
 813         LoadCompleteProgress(lastPart, /* aError = */ false, status);
 814
 815     RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 816     progressTracker->SyncNotifyProgress(progress);
 817   }
 818
 819   mTimedChannel = nullptr;
 820   return NS_OK;
 821 }
 822
 823 struct mimetype_closure {
 824   nsACString* newType;
 825 };
 826
 827 /* prototype for these defined below */
 828 static nsresult sniff_mimetype_callback(nsIInputStream* in, void* closure,
 829                                         const char* fromRawSegment,
 830                                         uint32_t toOffset, uint32_t count,
 831                                         uint32_t* writeCount);
 832
 833 /** nsThreadRetargetableStreamListener methods **/
 834 NS_IMETHODIMP
 835 imgRequest::CheckListenerChain() {
 836   // TODO Might need more checking here.
 837   NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!");
 838   return NS_OK;
 839 }
 840
 841 /** nsIStreamListener methods **/
 842
 843 struct NewPartResult final {
 844   explicit NewPartResult(image::Image* aExistingImage)
 845       : mImage(aExistingImage),
 846         mIsFirstPart(!aExistingImage),
 847         mSucceeded(false),
 848         mShouldResetCacheEntry(false) {}
 849
 850   nsAutoCString mContentType;
 851   nsAutoCString mContentDisposition;
 852   RefPtr<image::Image> mImage;
 853   const bool mIsFirstPart;
 854   bool mSucceeded;
 855   bool mShouldResetCacheEntry;
 856 };
 857
 858 static NewPartResult PrepareForNewPart(nsIRequest* aRequest,
 859                                        nsIInputStream* aInStr, uint32_t aCount,
 860                                        nsIURI* aURI, bool aIsMultipart,
 861                                        image::Image* aExistingImage,
 862                                        ProgressTracker* aProgressTracker,
 863                                        uint64_t aInnerWindowId) {
 864   NewPartResult result(aExistingImage);
 865
 866   if (aInStr) {
 867     mimetype_closure closure;
 868     closure.newType = &result.mContentType;
 869
 870     // Look at the first few bytes and see if we can tell what the data is from
 871     // that since servers tend to lie. :(
 872     uint32_t out;
 873     aInStr->ReadSegments(sniff_mimetype_callback, &closure, aCount, &out);
 874   }
 875
 876   nsCOMPtr<nsIChannel> chan(do_QueryInterface(aRequest));
 877   if (result.mContentType.IsEmpty()) {
 878     nsresult rv =
 879         chan ? chan->GetContentType(result.mContentType) : NS_ERROR_FAILURE;
 880     if (NS_FAILED(rv)) {
 881       MOZ_LOG(gImgLog, LogLevel::Error,
 882               ("imgRequest::PrepareForNewPart -- "
 883                "Content type unavailable from the channel\n"));
 884       if (!aIsMultipart) {
 885         return result;
 886       }
 887     }
 888   }
 889
 890   if (chan) {
 891     chan->GetContentDispositionHeader(result.mContentDisposition);
 892   }
 893
 894   MOZ_LOG(gImgLog, LogLevel::Debug,
 895           ("imgRequest::PrepareForNewPart -- Got content type %s\n",
 896            result.mContentType.get()));
 897
 898   // XXX If server lied about mimetype and it's SVG, we may need to copy
 899   // the data and dispatch back to the main thread, AND tell the channel to
 900   // dispatch there in the future.
 901
 902   // Create the new image and give it ownership of our ProgressTracker.
 903   if (aIsMultipart) {
 904     // Create the ProgressTracker and image for this part.
 905     RefPtr<ProgressTracker> progressTracker = new ProgressTracker();
 906     RefPtr<image::Image> partImage = image::ImageFactory::CreateImage(
 907         aRequest, progressTracker, result.mContentType, aURI,
 908         /* aIsMultipart = */ true, aInnerWindowId);
 909
 910     if (result.mIsFirstPart) {
 911       // First part for a multipart channel. Create the MultipartImage wrapper.
 912       MOZ_ASSERT(aProgressTracker, "Shouldn't have given away tracker yet");
 913       aProgressTracker->SetIsMultipart();
 914       result.mImage = image::ImageFactory::CreateMultipartImage(
 915           partImage, aProgressTracker);
 916     } else {
 917       // Transition to the new part.
 918       auto multipartImage = static_cast<MultipartImage*>(aExistingImage);
 919       multipartImage->BeginTransitionToPart(partImage);
 920
 921       // Reset our cache entry size so it doesn't keep growing without bound.
 922       result.mShouldResetCacheEntry = true;
 923     }
 924   } else {
 925     MOZ_ASSERT(!aExistingImage, "New part for non-multipart channel?");
 926     MOZ_ASSERT(aProgressTracker, "Shouldn't have given away tracker yet");
 927
 928     // Create an image using our progress tracker.
 929     result.mImage = image::ImageFactory::CreateImage(
 930         aRequest, aProgressTracker, result.mContentType, aURI,
 931         /* aIsMultipart = */ false, aInnerWindowId);
 932   }
 933
 934   MOZ_ASSERT(result.mImage);
 935   if (!result.mImage->HasError() || aIsMultipart) {
 936     // We allow multipart images to fail to initialize (which generally
 937     // indicates a bad content type) without cancelling the load, because
 938     // subsequent parts might be fine.
 939     result.mSucceeded = true;
 940   }
 941
 942   return result;
 943 }
 944
 945 class FinishPreparingForNewPartRunnable final : public Runnable {
 946  public:
 947   FinishPreparingForNewPartRunnable(imgRequest* aImgRequest,
 948                                     NewPartResult&& aResult)
 949       : Runnable("FinishPreparingForNewPartRunnable"),
 950         mImgRequest(aImgRequest),
 951         mResult(aResult) {
 952     MOZ_ASSERT(aImgRequest);
 953   }
 954
 955   NS_IMETHOD Run() override {
 956     mImgRequest->FinishPreparingForNewPart(mResult);
 957     return NS_OK;
 958   }
 959
 960  private:
 961   RefPtr<imgRequest> mImgRequest;
 962   NewPartResult mResult;
 963 };
 964
 965 void imgRequest::FinishPreparingForNewPart(const NewPartResult& aResult) {
 966   MOZ_ASSERT(NS_IsMainThread());
 967
 968   mContentType = aResult.mContentType;
 969
 970   SetProperties(aResult.mContentType, aResult.mContentDisposition);
 971
 972   if (aResult.mIsFirstPart) {
 973     // Notify listeners that we have an image.
 974     mImageAvailable = true;
 975     RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 976     progressTracker->OnImageAvailable();
 977     MOZ_ASSERT(progressTracker->HasImage());
 978   }
 979
 980   if (aResult.mShouldResetCacheEntry) {
 981     ResetCacheEntry();
 982   }
 983
 984   if (IsDecodeRequested()) {
 985     aResult.mImage->StartDecoding(imgIContainer::FLAG_NONE);
 986   }
 987 }
 988
 989 bool imgRequest::ImageAvailable() const { return mImageAvailable; }
 990
 991 NS_IMETHODIMP
 992 imgRequest::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aInStr,
 993                             uint64_t aOffset, uint32_t aCount) {
 994   LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::OnDataAvailable", "count", aCount);
 995
 996   NS_ASSERTION(aRequest, "imgRequest::OnDataAvailable -- no request!");
 997
 998   RefPtr<Image> image;
 999   RefPtr<ProgressTracker> progressTracker;
1000   bool isMultipart = false;
1001   bool newPartPending = false;
1002   uint64_t innerWindowId = 0;
1003
1004   // Retrieve and update our state.
1005   {
1006     MutexAutoLock lock(mMutex);
1007     image = mImage;
1008     progressTracker = mProgressTracker;
1009     isMultipart = mIsMultiPartChannel;
1010     newPartPending = mNewPartPending;
1011     mNewPartPending = false;
1012     innerWindowId = mInnerWindowId;
1013   }
1014
1015   // If this is a new part, we need to sniff its content type and create an
1016   // appropriate image.
1017   if (newPartPending) {
1018     NewPartResult result =
1019         PrepareForNewPart(aRequest, aInStr, aCount, mURI, isMultipart, image,
1020                           progressTracker, innerWindowId);
1021     bool succeeded = result.mSucceeded;
1022
1023     if (result.mImage) {
1024       image = result.mImage;
1025       nsCOMPtr<nsIEventTarget> eventTarget;
1026
1027       // Update our state to reflect this new part.
1028       {
1029         MutexAutoLock lock(mMutex);
1030         mImage = image;
1031
1032         // We only get an event target if we are not on the main thread, because
1033         // we have to dispatch in that case. If we are on the main thread, but
1034         // on a different scheduler group than ProgressTracker would give us,
1035         // that is okay because nothing in imagelib requires that, just our
1036         // listeners (which have their own checks).
1037         if (!NS_IsMainThread()) {
1038           eventTarget = mProgressTracker->GetEventTarget();
1039           MOZ_ASSERT(eventTarget);
1040         }
1041
1042         mProgressTracker = nullptr;
1043       }
1044
1045       // Some property objects are not threadsafe, and we need to send
1046       // OnImageAvailable on the main thread, so finish on the main thread.
1047       if (!eventTarget) {
1048         MOZ_ASSERT(NS_IsMainThread());
1049         FinishPreparingForNewPart(result);
1050       } else {
1051         nsCOMPtr<nsIRunnable> runnable =
1052             new FinishPreparingForNewPartRunnable(this, std::move(result));
1053         eventTarget->Dispatch(CreateRenderBlockingRunnable(runnable.forget()),
1054                               NS_DISPATCH_NORMAL);
1055       }
1056     }
1057
1058     if (!succeeded) {
1059       // Something went wrong; probably a content type issue.
1060       Cancel(NS_IMAGELIB_ERROR_FAILURE);
1061       return NS_BINDING_ABORTED;
1062     }
1063   }
1064
1065   // Notify the image that it has new data.
1066   if (aInStr) {
1067     nsresult rv =
1068         image->OnImageDataAvailable(aRequest, aInStr, aOffset, aCount);
1069
1070     if (NS_FAILED(rv)) {
1071       MOZ_LOG(gImgLog, LogLevel::Warning,
1072               ("[this=%p] imgRequest::OnDataAvailable -- "
1073                "copy to RasterImage failed\n",
1074                this));
1075       Cancel(NS_IMAGELIB_ERROR_FAILURE);
1076       return NS_BINDING_ABORTED;
1077     }
1078   }
1079
1080   return NS_OK;
1081 }
1082
1083 void imgRequest::SetProperties(const nsACString& aContentType,
1084                                const nsACString& aContentDisposition) {
1085   /* set our mimetype as a property */
1086   nsCOMPtr<nsISupportsCString> contentType =
1087       do_CreateInstance("@mozilla.org/supports-cstring;1");
1088   if (contentType) {
1089     contentType->SetData(aContentType);
1090     mProperties->Set("type", contentType);
1091   }
1092
1093   /* set our content disposition as a property */
1094   if (!aContentDisposition.IsEmpty()) {
1095     nsCOMPtr<nsISupportsCString> contentDisposition =
1096         do_CreateInstance("@mozilla.org/supports-cstring;1");
1097     if (contentDisposition) {
1098       contentDisposition->SetData(aContentDisposition);
1099       mProperties->Set("content-disposition", contentDisposition);
1100     }
1101   }
1102 }
1103
1104 static nsresult sniff_mimetype_callback(nsIInputStream* in, void* data,
1105                                         const char* fromRawSegment,
1106                                         uint32_t toOffset, uint32_t count,
1107                                         uint32_t* writeCount) {
1108   mimetype_closure* closure = static_cast<mimetype_closure*>(data);
1109
1110   NS_ASSERTION(closure, "closure is null!");
1111
1112   if (count > 0) {
1113     imgLoader::GetMimeTypeFromContent(fromRawSegment, count, *closure->newType);
1114   }
1115
1116   *writeCount = 0;
1117   return NS_ERROR_FAILURE;
1118 }
1119
1120 /** nsIInterfaceRequestor methods **/
1121
1122 NS_IMETHODIMP
1123 imgRequest::GetInterface(const nsIID& aIID, void** aResult) {
1124   if (!mPrevChannelSink || aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
1125     return QueryInterface(aIID, aResult);
1126   }
1127
1128   NS_ASSERTION(
1129       mPrevChannelSink != this,
1130       "Infinite recursion - don't keep track of channel sinks that are us!");
1131   return mPrevChannelSink->GetInterface(aIID, aResult);
1132 }
1133
1134 /** nsIChannelEventSink methods **/
1135 NS_IMETHODIMP
1136 imgRequest::AsyncOnChannelRedirect(nsIChannel* oldChannel,
1137                                    nsIChannel* newChannel, uint32_t flags,
1138                                    nsIAsyncVerifyRedirectCallback* callback) {
1139   NS_ASSERTION(mRequest && mChannel,
1140                "Got a channel redirect after we nulled out mRequest!");
1141   NS_ASSERTION(mChannel == oldChannel,
1142                "Got a channel redirect for an unknown channel!");
1143   NS_ASSERTION(newChannel, "Got a redirect to a NULL channel!");
1144
1145   SetCacheValidation(mCacheEntry, oldChannel);
1146
1147   // Prepare for callback
1148   mRedirectCallback = callback;
1149   mNewRedirectChannel = newChannel;
1150
1151   nsCOMPtr<nsIChannelEventSink> sink(do_GetInterface(mPrevChannelSink));
1152   if (sink) {
1153     nsresult rv =
1154         sink->AsyncOnChannelRedirect(oldChannel, newChannel, flags, this);
1155     if (NS_FAILED(rv)) {
1156       mRedirectCallback = nullptr;
1157       mNewRedirectChannel = nullptr;
1158     }
1159     return rv;
1160   }
1161
1162   (void)OnRedirectVerifyCallback(NS_OK);
1163   return NS_OK;
1164 }
1165
1166 NS_IMETHODIMP
1167 imgRequest::OnRedirectVerifyCallback(nsresult result) {
1168   NS_ASSERTION(mRedirectCallback, "mRedirectCallback not set in callback");
1169   NS_ASSERTION(mNewRedirectChannel, "mNewRedirectChannel not set in callback");
1170
1171   if (NS_FAILED(result)) {
1172     mRedirectCallback->OnRedirectVerifyCallback(result);
1173     mRedirectCallback = nullptr;
1174     mNewRedirectChannel = nullptr;
1175     return NS_OK;
1176   }
1177
1178   mChannel = mNewRedirectChannel;
1179   mTimedChannel = do_QueryInterface(mChannel);
1180   mNewRedirectChannel = nullptr;
1181
1182   if (LOG_TEST(LogLevel::Debug)) {
1183     LOG_MSG_WITH_PARAM(gImgLog, "imgRequest::OnChannelRedirect", "old",
1184                        mFinalURI ? mFinalURI->GetSpecOrDefault().get() : "");
1185   }
1186
1187   // If the previous URI is a non-HTTPS URI, record that fact for later use by
1188   // security code, which needs to know whether there is an insecure load at any
1189   // point in the redirect chain.
1190   bool schemeLocal = false;
1191   if (NS_FAILED(NS_URIChainHasFlags(mFinalURI,
1192                                     nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
1193                                     &schemeLocal)) ||
1194       (!mFinalURI->SchemeIs("https") && !mFinalURI->SchemeIs("chrome") &&
1195        !schemeLocal)) {
1196     MutexAutoLock lock(mMutex);
1197
1198     // The csp directive upgrade-insecure-requests performs an internal redirect
1199     // to upgrade all requests from http to https before any data is fetched
1200     // from the network. Do not pollute mHadInsecureRedirect in case of such an
1201     // internal redirect.
1202     nsCOMPtr<nsILoadInfo> loadInfo = mChannel->LoadInfo();
1203     bool upgradeInsecureRequests =
1204         loadInfo ? loadInfo->GetUpgradeInsecureRequests() ||
1205                        loadInfo->GetBrowserUpgradeInsecureRequests()
1206                  : false;
1207     if (!upgradeInsecureRequests) {
1208       mHadInsecureRedirect = true;
1209     }
1210   }
1211
1212   // Update the final URI.
1213   mChannel->GetURI(getter_AddRefs(mFinalURI));
1214
1215   if (LOG_TEST(LogLevel::Debug)) {
1216     LOG_MSG_WITH_PARAM(gImgLog, "imgRequest::OnChannelRedirect", "new",
1217                        mFinalURI ? mFinalURI->GetSpecOrDefault().get() : "");
1218   }
1219
1220   // Make sure we have a protocol that returns data rather than opens an
1221   // external application, e.g. 'mailto:'.
1222   if (nsContentUtils::IsExternalProtocol(mFinalURI)) {
1223     mRedirectCallback->OnRedirectVerifyCallback(NS_ERROR_ABORT);
1224     mRedirectCallback = nullptr;
1225     return NS_OK;
1226   }
1227
1228   mRedirectCallback->OnRedirectVerifyCallback(NS_OK);
1229   mRedirectCallback = nullptr;
1230   return NS_OK;
1231 }