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 "plstr.h"   // PL_strcasestr(...)
  37 #include "prtime.h"  // for PR_Now
  38 #include "nsNetUtil.h"
  39 #include "nsIProtocolHandler.h"
  40 #include "imgIRequest.h"
  41 #include "nsProperties.h"
  42 #include "nsIURL.h"
  43
  44 #include "mozilla/IntegerPrintfMacros.h"
  45 #include "mozilla/SizeOfState.h"
  46
  47 using namespace mozilla;
  48 using namespace mozilla::image;
  49
  50 #define LOG_TEST(level) (MOZ_LOG_TEST(gImgLog, (level)))
  51
  52 NS_IMPL_ISUPPORTS(imgRequest, nsIStreamListener, nsIRequestObserver,
  53                   nsIThreadRetargetableStreamListener, nsIChannelEventSink,
  54                   nsIInterfaceRequestor, nsIAsyncVerifyRedirectCallback)
  55
  56 imgRequest::imgRequest(imgLoader* aLoader, const ImageCacheKey& aCacheKey)
  57     : mLoader(aLoader),
  58       mCacheKey(aCacheKey),
  59       mLoadId(nullptr),
  60       mFirstProxy(nullptr),
  61       mValidator(nullptr),
  62       mCORSMode(CORS_NONE),
  63       mImageErrorCode(NS_OK),
  64       mImageAvailable(false),
  65       mIsDeniedCrossSiteCORSRequest(false),
  66       mIsCrossSiteNoCORSRequest(false),
  67       mMutex("imgRequest"),
  68       mProgressTracker(new ProgressTracker()),
  69       mIsMultiPartChannel(false),
  70       mIsInCache(false),
  71       mDecodeRequested(false),
  72       mNewPartPending(false),
  73       mHadInsecureRedirect(false),
  74       mInnerWindowId(0) {
  75   LOG_FUNC(gImgLog, "imgRequest::imgRequest()");
  76 }
  77
  78 imgRequest::~imgRequest() {
  79   if (mLoader) {
  80     mLoader->RemoveFromUncachedImages(this);
  81   }
  82   if (mURI) {
  83     LOG_FUNC_WITH_PARAM(gImgLog, "imgRequest::~imgRequest()", "keyuri", mURI);
  84   } else
  85     LOG_FUNC(gImgLog, "imgRequest::~imgRequest()");
  86 }
  87
  88 nsresult imgRequest::Init(
  89     nsIURI* aURI, nsIURI* aFinalURI, bool aHadInsecureRedirect,
  90     nsIRequest* aRequest, nsIChannel* aChannel, imgCacheEntry* aCacheEntry,
  91     mozilla::dom::Document* aLoadingDocument,
  92     nsIPrincipal* aTriggeringPrincipal, mozilla::CORSMode aCORSMode,
  93     nsIReferrerInfo* aReferrerInfo) MOZ_NO_THREAD_SAFETY_ANALYSIS {
  94   MOZ_ASSERT(NS_IsMainThread(), "Cannot use nsIURI off main thread!");
  95   // Init() can only be called once, and that's before it can be used off
  96   // mainthread
  97
  98   LOG_FUNC(gImgLog, "imgRequest::Init");
  99
 100   MOZ_ASSERT(!mImage, "Multiple calls to init");
 101   MOZ_ASSERT(aURI, "No uri");
 102   MOZ_ASSERT(aFinalURI, "No final uri");
 103   MOZ_ASSERT(aRequest, "No request");
 104   MOZ_ASSERT(aChannel, "No channel");
 105
 106   mProperties = new nsProperties();
 107   mURI = aURI;
 108   mFinalURI = aFinalURI;
 109   mRequest = aRequest;
 110   mChannel = aChannel;
 111   mTimedChannel = do_QueryInterface(mChannel);
 112   mTriggeringPrincipal = aTriggeringPrincipal;
 113   mCORSMode = aCORSMode;
 114   mReferrerInfo = aReferrerInfo;
 115
 116   // If the original URI and the final URI are different, check whether the
 117   // original URI is secure. We deliberately don't take the final URI into
 118   // account, as it needs to be handled using more complicated rules than
 119   // earlier elements of the redirect chain.
 120   if (aURI != aFinalURI) {
 121     bool schemeLocal = false;
 122     if (NS_FAILED(NS_URIChainHasFlags(
 123             aURI, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE, &schemeLocal)) ||
 124         (!aURI->SchemeIs("https") && !aURI->SchemeIs("chrome") &&
 125          !schemeLocal)) {
 126       mHadInsecureRedirect = true;
 127     }
 128   }
 129
 130   // imgCacheValidator may have handled redirects before we were created, so we
 131   // allow the caller to let us know if any redirects were insecure.
 132   mHadInsecureRedirect = mHadInsecureRedirect || aHadInsecureRedirect;
 133
 134   mChannel->GetNotificationCallbacks(getter_AddRefs(mPrevChannelSink));
 135
 136   NS_ASSERTION(mPrevChannelSink != this,
 137                "Initializing with a channel that already calls back to us!");
 138
 139   mChannel->SetNotificationCallbacks(this);
 140
 141   mCacheEntry = aCacheEntry;
 142   mCacheEntry->UpdateLoadTime();
 143
 144   SetLoadId(aLoadingDocument);
 145
 146   // Grab the inner window ID of the loading document, if possible.
 147   if (aLoadingDocument) {
 148     mInnerWindowId = aLoadingDocument->InnerWindowID();
 149   }
 150
 151   return NS_OK;
 152 }
 153
 154 bool imgRequest::CanReuseWithoutValidation(dom::Document* aDoc) const {
 155   // If the request's loadId is the same as the aLoadingDocument, then it is ok
 156   // to use this one because it has already been validated for this context.
 157   // XXX: nullptr seems to be a 'special' key value that indicates that NO
 158   //      validation is required.
 159   // XXX: we also check the window ID because the loadID() can return a reused
 160   //      pointer of a document. This can still happen for non-document image
 161   //      cache entries.
 162   void* key = (void*)aDoc;
 163   uint64_t innerWindowID = aDoc ? aDoc->InnerWindowID() : 0;
 164   if (LoadId() == key && InnerWindowID() == innerWindowID) {
 165     return true;
 166   }
 167
 168   // As a special-case, if this is a print preview document, also validate on
 169   // the original document. This allows to print uncacheable images.
 170   if (dom::Document* original = aDoc ? aDoc->GetOriginalDocument() : nullptr) {
 171     return CanReuseWithoutValidation(original);
 172   }
 173
 174   return false;
 175 }
 176
 177 void imgRequest::ClearLoader() { mLoader = nullptr; }
 178
 179 already_AddRefed<nsIPrincipal> imgRequest::GetTriggeringPrincipal() const {
 180   nsCOMPtr<nsIPrincipal> principal = mTriggeringPrincipal;
 181   return principal.forget();
 182 }
 183
 184 already_AddRefed<ProgressTracker> imgRequest::GetProgressTracker() const {
 185   MutexAutoLock lock(mMutex);
 186
 187   if (mImage) {
 188     MOZ_ASSERT(!mProgressTracker,
 189                "Should have given mProgressTracker to mImage");
 190     return mImage->GetProgressTracker();
 191   }
 192   MOZ_ASSERT(mProgressTracker,
 193              "Should have mProgressTracker until we create mImage");
 194   RefPtr<ProgressTracker> progressTracker = mProgressTracker;
 195   MOZ_ASSERT(progressTracker);
 196   return progressTracker.forget();
 197 }
 198
 199 void imgRequest::SetCacheEntry(imgCacheEntry* entry) { mCacheEntry = entry; }
 200
 201 bool imgRequest::HasCacheEntry() const { return mCacheEntry != nullptr; }
 202
 203 void imgRequest::ResetCacheEntry() {
 204   if (HasCacheEntry()) {
 205     mCacheEntry->SetDataSize(0);
 206   }
 207 }
 208
 209 void imgRequest::AddProxy(imgRequestProxy* proxy) {
 210   MOZ_ASSERT(proxy, "null imgRequestProxy passed in");
 211   LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::AddProxy", "proxy", proxy);
 212
 213   if (!mFirstProxy) {
 214     // Save a raw pointer to the first proxy we see, for use in the network
 215     // priority logic.
 216     mFirstProxy = proxy;
 217   }
 218
 219   // If we're empty before adding, we have to tell the loader we now have
 220   // proxies.
 221   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 222   if (progressTracker->ObserverCount() == 0) {
 223     MOZ_ASSERT(mURI, "Trying to SetHasProxies without key uri.");
 224     if (mLoader) {
 225       mLoader->SetHasProxies(this);
 226     }
 227   }
 228
 229   progressTracker->AddObserver(proxy);
 230 }
 231
 232 nsresult imgRequest::RemoveProxy(imgRequestProxy* proxy, nsresult aStatus) {
 233   LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::RemoveProxy", "proxy", proxy);
 234
 235   // This will remove our animation consumers, so after removing
 236   // this proxy, we don't end up without proxies with observers, but still
 237   // have animation consumers.
 238   proxy->ClearAnimationConsumers();
 239
 240   // Let the status tracker do its thing before we potentially call Cancel()
 241   // below, because Cancel() may result in OnStopRequest being called back
 242   // before Cancel() returns, leaving the image in a different state then the
 243   // one it was in at this point.
 244   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 245   if (!progressTracker->RemoveObserver(proxy)) {
 246     return NS_OK;
 247   }
 248
 249   if (progressTracker->ObserverCount() == 0) {
 250     // If we have no observers, there's nothing holding us alive. If we haven't
 251     // been cancelled and thus removed from the cache, tell the image loader so
 252     // we can be evicted from the cache.
 253     if (mCacheEntry) {
 254       MOZ_ASSERT(mURI, "Removing last observer without key uri.");
 255
 256       if (mLoader) {
 257         mLoader->SetHasNoProxies(this, mCacheEntry);
 258       }
 259     } else {
 260       LOG_MSG_WITH_PARAM(gImgLog, "imgRequest::RemoveProxy no cache entry",
 261                          "uri", mURI);
 262     }
 263
 264     /* If |aStatus| is a failure code, then cancel the load if it is still in
 265        progress.  Otherwise, let the load continue, keeping 'this' in the cache
 266        with no observers.  This way, if a proxy is destroyed without calling
 267        cancel on it, it won't leak and won't leave a bad pointer in the observer
 268        list.
 269      */
 270     if (!(progressTracker->GetProgress() & FLAG_LAST_PART_COMPLETE) &&
 271         NS_FAILED(aStatus)) {
 272       LOG_MSG(gImgLog, "imgRequest::RemoveProxy",
 273               "load in progress.  canceling");
 274
 275       this->Cancel(NS_BINDING_ABORTED);
 276     }
 277
 278     /* break the cycle from the cache entry. */
 279     mCacheEntry = nullptr;
 280   }
 281
 282   return NS_OK;
 283 }
 284
 285 uint64_t imgRequest::InnerWindowID() const {
 286   MutexAutoLock lock(mMutex);
 287   return mInnerWindowId;
 288 }
 289
 290 void imgRequest::SetInnerWindowID(uint64_t aInnerWindowId) {
 291   MutexAutoLock lock(mMutex);
 292   mInnerWindowId = aInnerWindowId;
 293 }
 294
 295 void imgRequest::CancelAndAbort(nsresult aStatus) {
 296   LOG_SCOPE(gImgLog, "imgRequest::CancelAndAbort");
 297
 298   Cancel(aStatus);
 299
 300   // It's possible for the channel to fail to open after we've set our
 301   // notification callbacks. In that case, make sure to break the cycle between
 302   // the channel and us, because it won't.
 303   if (mChannel) {
 304     mChannel->SetNotificationCallbacks(mPrevChannelSink);
 305     mPrevChannelSink = nullptr;
 306   }
 307 }
 308
 309 class imgRequestMainThreadCancel : public Runnable {
 310  public:
 311   imgRequestMainThreadCancel(imgRequest* aImgRequest, nsresult aStatus)
 312       : Runnable("imgRequestMainThreadCancel"),
 313         mImgRequest(aImgRequest),
 314         mStatus(aStatus) {
 315     MOZ_ASSERT(!NS_IsMainThread(), "Create me off main thread only!");
 316     MOZ_ASSERT(aImgRequest);
 317   }
 318
 319   NS_IMETHOD Run() override {
 320     MOZ_ASSERT(NS_IsMainThread(), "I should be running on the main thread!");
 321     mImgRequest->ContinueCancel(mStatus);
 322     return NS_OK;
 323   }
 324
 325  private:
 326   RefPtr<imgRequest> mImgRequest;
 327   nsresult mStatus;
 328 };
 329
 330 void imgRequest::Cancel(nsresult aStatus) {
 331   /* The Cancel() method here should only be called by this class. */
 332   LOG_SCOPE(gImgLog, "imgRequest::Cancel");
 333
 334   if (NS_IsMainThread()) {
 335     ContinueCancel(aStatus);
 336   } else {
 337     RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 338     nsCOMPtr<nsIEventTarget> eventTarget = progressTracker->GetEventTarget();
 339     nsCOMPtr<nsIRunnable> ev = new imgRequestMainThreadCancel(this, aStatus);
 340     eventTarget->Dispatch(ev.forget(), NS_DISPATCH_NORMAL);
 341   }
 342 }
 343
 344 void imgRequest::ContinueCancel(nsresult aStatus) {
 345   MOZ_ASSERT(NS_IsMainThread());
 346
 347   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 348   progressTracker->SyncNotifyProgress(FLAG_HAS_ERROR);
 349
 350   RemoveFromCache();
 351
 352   if (mRequest && !(progressTracker->GetProgress() & FLAG_LAST_PART_COMPLETE)) {
 353     mRequest->CancelWithReason(aStatus, "imgRequest::ContinueCancel"_ns);
 354   }
 355 }
 356
 357 class imgRequestMainThreadEvict : public Runnable {
 358  public:
 359   explicit imgRequestMainThreadEvict(imgRequest* aImgRequest)
 360       : Runnable("imgRequestMainThreadEvict"), mImgRequest(aImgRequest) {
 361     MOZ_ASSERT(!NS_IsMainThread(), "Create me off main thread only!");
 362     MOZ_ASSERT(aImgRequest);
 363   }
 364
 365   NS_IMETHOD Run() override {
 366     MOZ_ASSERT(NS_IsMainThread(), "I should be running on the main thread!");
 367     mImgRequest->ContinueEvict();
 368     return NS_OK;
 369   }
 370
 371  private:
 372   RefPtr<imgRequest> mImgRequest;
 373 };
 374
 375 // EvictFromCache() is written to allowed to get called from any thread
 376 void imgRequest::EvictFromCache() {
 377   /* The EvictFromCache() method here should only be called by this class. */
 378   LOG_SCOPE(gImgLog, "imgRequest::EvictFromCache");
 379
 380   if (NS_IsMainThread()) {
 381     ContinueEvict();
 382   } else {
 383     NS_DispatchToMainThread(new imgRequestMainThreadEvict(this));
 384   }
 385 }
 386
 387 // Helper-method used by EvictFromCache()
 388 void imgRequest::ContinueEvict() {
 389   MOZ_ASSERT(NS_IsMainThread());
 390
 391   RemoveFromCache();
 392 }
 393
 394 void imgRequest::StartDecoding() {
 395   MutexAutoLock lock(mMutex);
 396   mDecodeRequested = true;
 397 }
 398
 399 bool imgRequest::IsDecodeRequested() const {
 400   MutexAutoLock lock(mMutex);
 401   return mDecodeRequested;
 402 }
 403
 404 nsresult imgRequest::GetURI(nsIURI** aURI) {
 405   MOZ_ASSERT(aURI);
 406
 407   LOG_FUNC(gImgLog, "imgRequest::GetURI");
 408
 409   if (mURI) {
 410     *aURI = mURI;
 411     NS_ADDREF(*aURI);
 412     return NS_OK;
 413   }
 414
 415   return NS_ERROR_FAILURE;
 416 }
 417
 418 nsresult imgRequest::GetFinalURI(nsIURI** aURI) {
 419   MOZ_ASSERT(aURI);
 420
 421   LOG_FUNC(gImgLog, "imgRequest::GetFinalURI");
 422
 423   if (mFinalURI) {
 424     *aURI = mFinalURI;
 425     NS_ADDREF(*aURI);
 426     return NS_OK;
 427   }
 428
 429   return NS_ERROR_FAILURE;
 430 }
 431
 432 bool imgRequest::IsChrome() const { return mURI->SchemeIs("chrome"); }
 433
 434 bool imgRequest::IsData() const { return mURI->SchemeIs("data"); }
 435
 436 nsresult imgRequest::GetImageErrorCode() { return mImageErrorCode; }
 437
 438 void imgRequest::RemoveFromCache() {
 439   LOG_SCOPE(gImgLog, "imgRequest::RemoveFromCache");
 440
 441   bool isInCache = false;
 442
 443   {
 444     MutexAutoLock lock(mMutex);
 445     isInCache = mIsInCache;
 446   }
 447
 448   if (isInCache && mLoader) {
 449     // mCacheEntry is nulled out when we have no more observers.
 450     if (mCacheEntry) {
 451       mLoader->RemoveFromCache(mCacheEntry);
 452     } else {
 453       mLoader->RemoveFromCache(mCacheKey);
 454     }
 455   }
 456
 457   mCacheEntry = nullptr;
 458 }
 459
 460 bool imgRequest::HasConsumers() const {
 461   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 462   return progressTracker && progressTracker->ObserverCount() > 0;
 463 }
 464
 465 already_AddRefed<image::Image> imgRequest::GetImage() const {
 466   MutexAutoLock lock(mMutex);
 467   RefPtr<image::Image> image = mImage;
 468   return image.forget();
 469 }
 470
 471 void imgRequest::GetFileName(nsACString& aFileName) {
 472   nsAutoString fileName;
 473
 474   nsCOMPtr<nsISupportsCString> supportscstr;
 475   if (NS_SUCCEEDED(mProperties->Get("content-disposition",
 476                                     NS_GET_IID(nsISupportsCString),
 477                                     getter_AddRefs(supportscstr))) &&
 478       supportscstr) {
 479     nsAutoCString cdHeader;
 480     supportscstr->GetData(cdHeader);
 481     NS_GetFilenameFromDisposition(fileName, cdHeader);
 482   }
 483
 484   if (fileName.IsEmpty()) {
 485     nsCOMPtr<nsIURL> imgUrl(do_QueryInterface(mURI));
 486     if (imgUrl) {
 487       imgUrl->GetFileName(aFileName);
 488       NS_UnescapeURL(aFileName);
 489     }
 490   } else {
 491     aFileName = NS_ConvertUTF16toUTF8(fileName);
 492   }
 493 }
 494
 495 int32_t imgRequest::Priority() const {
 496   int32_t priority = nsISupportsPriority::PRIORITY_NORMAL;
 497   nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(mRequest);
 498   if (p) {
 499     p->GetPriority(&priority);
 500   }
 501   return priority;
 502 }
 503
 504 void imgRequest::AdjustPriority(imgRequestProxy* proxy, int32_t delta) {
 505   // only the first proxy is allowed to modify the priority of this image load.
 506   //
 507   // XXX(darin): this is probably not the most optimal algorithm as we may want
 508   // to increase the priority of requests that have a lot of proxies.  the key
 509   // concern though is that image loads remain lower priority than other pieces
 510   // of content such as link clicks, CSS, and JS.
 511   //
 512   if (!mFirstProxy || proxy != mFirstProxy) {
 513     return;
 514   }
 515
 516   AdjustPriorityInternal(delta);
 517 }
 518
 519 void imgRequest::AdjustPriorityInternal(int32_t aDelta) {
 520   nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(mChannel);
 521   if (p) {
 522     p->AdjustPriority(aDelta);
 523   }
 524 }
 525
 526 void imgRequest::BoostPriority(uint32_t aCategory) {
 527   if (!StaticPrefs::image_layout_network_priority()) {
 528     return;
 529   }
 530
 531   uint32_t newRequestedCategory =
 532       (mBoostCategoriesRequested & aCategory) ^ aCategory;
 533   if (!newRequestedCategory) {
 534     // priority boost for each category can only apply once.
 535     return;
 536   }
 537
 538   MOZ_LOG(gImgLog, LogLevel::Debug,
 539           ("[this=%p] imgRequest::BoostPriority for category %x", this,
 540            newRequestedCategory));
 541
 542   int32_t delta = 0;
 543
 544   if (newRequestedCategory & imgIRequest::CATEGORY_FRAME_INIT) {
 545     --delta;
 546   }
 547
 548   if (newRequestedCategory & imgIRequest::CATEGORY_FRAME_STYLE) {
 549     --delta;
 550   }
 551
 552   if (newRequestedCategory & imgIRequest::CATEGORY_SIZE_QUERY) {
 553     --delta;
 554   }
 555
 556   if (newRequestedCategory & imgIRequest::CATEGORY_DISPLAY) {
 557     delta += nsISupportsPriority::PRIORITY_HIGH;
 558   }
 559
 560   AdjustPriorityInternal(delta);
 561   mBoostCategoriesRequested |= newRequestedCategory;
 562 }
 563
 564 void imgRequest::SetIsInCache(bool aInCache) {
 565   LOG_FUNC_WITH_PARAM(gImgLog, "imgRequest::SetIsCacheable", "aInCache",
 566                       aInCache);
 567   MutexAutoLock lock(mMutex);
 568   mIsInCache = aInCache;
 569 }
 570
 571 void imgRequest::UpdateCacheEntrySize() {
 572   if (!mCacheEntry) {
 573     return;
 574   }
 575
 576   RefPtr<Image> image = GetImage();
 577   SizeOfState state(moz_malloc_size_of);
 578   size_t size = image->SizeOfSourceWithComputedFallback(state);
 579   mCacheEntry->SetDataSize(size);
 580 }
 581
 582 void imgRequest::SetCacheValidation(imgCacheEntry* aCacheEntry,
 583                                     nsIRequest* aRequest) {
 584   /* get the expires info */
 585   if (!aCacheEntry || aCacheEntry->GetExpiryTime() != 0) {
 586     return;
 587   }
 588
 589   RefPtr<imgRequest> req = aCacheEntry->GetRequest();
 590   MOZ_ASSERT(req);
 591   RefPtr<nsIURI> uri;
 592   req->GetURI(getter_AddRefs(uri));
 593   // TODO(emilio): Seems we should be able to assert `uri` is not null, but we
 594   // get here in such cases sometimes (like for some redirects, see
 595   // docshell/test/chrome/test_bug89419.xhtml).
 596   //
 597   // We have the original URI in the cache key though, probably we should be
 598   // using that instead of relying on Init() getting called.
 599   auto info = nsContentUtils::GetSubresourceCacheValidationInfo(aRequest, uri);
 600
 601   // Expiration time defaults to 0. We set the expiration time on our entry if
 602   // it hasn't been set yet.
 603   if (!info.mExpirationTime) {
 604     // If the channel doesn't support caching, then ensure this expires the
 605     // next time it is used.
 606     info.mExpirationTime.emplace(nsContentUtils::SecondsFromPRTime(PR_Now()) -
 607                                  1);
 608   }
 609   aCacheEntry->SetExpiryTime(*info.mExpirationTime);
 610   // Cache entries default to not needing to validate. We ensure that
 611   // multiple calls to this function don't override an earlier decision to
 612   // validate by making validation a one-way decision.
 613   if (info.mMustRevalidate) {
 614     aCacheEntry->SetMustValidate(info.mMustRevalidate);
 615   }
 616 }
 617
 618 bool imgRequest::GetMultipart() const {
 619   MutexAutoLock lock(mMutex);
 620   return mIsMultiPartChannel;
 621 }
 622
 623 bool imgRequest::HadInsecureRedirect() const {
 624   MutexAutoLock lock(mMutex);
 625   return mHadInsecureRedirect;
 626 }
 627
 628 /** nsIRequestObserver methods **/
 629
 630 NS_IMETHODIMP
 631 imgRequest::OnStartRequest(nsIRequest* aRequest) {
 632   LOG_SCOPE(gImgLog, "imgRequest::OnStartRequest");
 633
 634   RefPtr<Image> image;
 635
 636   if (nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest)) {
 637     nsresult rv;
 638     nsCOMPtr<nsILoadInfo> loadInfo = httpChannel->LoadInfo();
 639     mIsDeniedCrossSiteCORSRequest =
 640         loadInfo->GetTainting() == LoadTainting::CORS &&
 641         (NS_FAILED(httpChannel->GetStatus(&rv)) || NS_FAILED(rv));
 642     mIsCrossSiteNoCORSRequest = loadInfo->GetTainting() == LoadTainting::Opaque;
 643   }
 644
 645   // Figure out if we're multipart.
 646   nsCOMPtr<nsIMultiPartChannel> multiPartChannel = do_QueryInterface(aRequest);
 647   {
 648     MutexAutoLock lock(mMutex);
 649
 650     MOZ_ASSERT(multiPartChannel || !mIsMultiPartChannel,
 651                "Stopped being multipart?");
 652
 653     mNewPartPending = true;
 654     image = mImage;
 655     mIsMultiPartChannel = bool(multiPartChannel);
 656   }
 657
 658   // If we're not multipart, we shouldn't have an image yet.
 659   if (image && !multiPartChannel) {
 660     MOZ_ASSERT_UNREACHABLE("Already have an image for a non-multipart request");
 661     Cancel(NS_IMAGELIB_ERROR_FAILURE);
 662     return NS_ERROR_FAILURE;
 663   }
 664
 665   /*
 666    * If mRequest is null here, then we need to set it so that we'll be able to
 667    * cancel it if our Cancel() method is called.  Note that this can only
 668    * happen for multipart channels.  We could simply not null out mRequest for
 669    * non-last parts, if GetIsLastPart() were reliable, but it's not.  See
 670    * https://bugzilla.mozilla.org/show_bug.cgi?id=339610
 671    */
 672   if (!mRequest) {
 673     MOZ_ASSERT(multiPartChannel, "Should have mRequest unless we're multipart");
 674     nsCOMPtr<nsIChannel> baseChannel;
 675     multiPartChannel->GetBaseChannel(getter_AddRefs(baseChannel));
 676     mRequest = baseChannel;
 677   }
 678
 679   nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
 680   if (channel) {
 681     /* Get our principal */
 682     nsCOMPtr<nsIScriptSecurityManager> secMan =
 683         nsContentUtils::GetSecurityManager();
 684     if (secMan) {
 685       nsresult rv = secMan->GetChannelResultPrincipal(
 686           channel, getter_AddRefs(mPrincipal));
 687       if (NS_FAILED(rv)) {
 688         return rv;
 689       }
 690     }
 691   }
 692
 693   SetCacheValidation(mCacheEntry, aRequest);
 694
 695   // Shouldn't we be dead already if this gets hit?
 696   // Probably multipart/x-mixed-replace...
 697   RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 698   if (progressTracker->ObserverCount() == 0) {
 699     this->Cancel(NS_IMAGELIB_ERROR_FAILURE);
 700   }
 701
 702   // Try to retarget OnDataAvailable to a decode thread. We must process data
 703   // URIs synchronously as per the spec however.
 704   if (!channel || IsData()) {
 705     return NS_OK;
 706   }
 707
 708   nsCOMPtr<nsIThreadRetargetableRequest> retargetable =
 709       do_QueryInterface(aRequest);
 710   if (retargetable) {
 711     nsAutoCString mimeType;
 712     nsresult rv = channel->GetContentType(mimeType);
 713     if (NS_SUCCEEDED(rv) && !mimeType.EqualsLiteral(IMAGE_SVG_XML)) {
 714       // Retarget OnDataAvailable to the DecodePool's IO thread.
 715       nsCOMPtr<nsIEventTarget> target =
 716           DecodePool::Singleton()->GetIOEventTarget();
 717       rv = retargetable->RetargetDeliveryTo(target);
 718     }
 719     MOZ_LOG(gImgLog, LogLevel::Warning,
 720             ("[this=%p] imgRequest::OnStartRequest -- "
 721              "RetargetDeliveryTo rv %" PRIu32 "=%s\n",
 722              this, static_cast<uint32_t>(rv),
 723              NS_SUCCEEDED(rv) ? "succeeded" : "failed"));
 724   }
 725
 726   return NS_OK;
 727 }
 728
 729 NS_IMETHODIMP
 730 imgRequest::OnStopRequest(nsIRequest* aRequest, nsresult status) {
 731   LOG_FUNC(gImgLog, "imgRequest::OnStopRequest");
 732   MOZ_ASSERT(NS_IsMainThread(), "Can't send notifications off-main-thread");
 733
 734   RefPtr<Image> image = GetImage();
 735
 736   RefPtr<imgRequest> strongThis = this;
 737
 738   bool isMultipart = false;
 739   bool newPartPending = false;
 740   {
 741     MutexAutoLock lock(mMutex);
 742     isMultipart = mIsMultiPartChannel;
 743     newPartPending = mNewPartPending;
 744   }
 745   if (isMultipart && newPartPending) {
 746     OnDataAvailable(aRequest, nullptr, 0, 0);
 747   }
 748
 749   // XXXldb What if this is a non-last part of a multipart request?
 750   // xxx before we release our reference to mRequest, lets
 751   // save the last status that we saw so that the
 752   // imgRequestProxy will have access to it.
 753   if (mRequest) {
 754     mRequest = nullptr;  // we no longer need the request
 755   }
 756
 757   // stop holding a ref to the channel, since we don't need it anymore
 758   if (mChannel) {
 759     mChannel->SetNotificationCallbacks(mPrevChannelSink);
 760     mPrevChannelSink = nullptr;
 761     mChannel = nullptr;
 762   }
 763
 764   bool lastPart = true;
 765   nsCOMPtr<nsIMultiPartChannel> mpchan(do_QueryInterface(aRequest));
 766   if (mpchan) {
 767     mpchan->GetIsLastPart(&lastPart);
 768   }
 769
 770   bool isPartial = false;
 771   if (image && (status == NS_ERROR_NET_PARTIAL_TRANSFER)) {
 772     isPartial = true;
 773     status = NS_OK;  // fake happy face
 774   }
 775
 776   // Tell the image that it has all of the source data. Note that this can
 777   // trigger a failure, since the image might be waiting for more non-optional
 778   // data and this is the point where we break the news that it's not coming.
 779   if (image) {
 780     nsresult rv = image->OnImageDataComplete(aRequest, status, lastPart);
 781
 782     // If we got an error in the OnImageDataComplete() call, we don't want to
 783     // proceed as if nothing bad happened. However, we also want to give
 784     // precedence to failure status codes from necko, since presumably they're
 785     // more meaningful.
 786     if (NS_FAILED(rv) && NS_SUCCEEDED(status)) {
 787       status = rv;
 788     }
 789   }
 790
 791   // If the request went through, update the cache entry size. Otherwise,
 792   // cancel the request, which removes us from the cache.
 793   if (image && NS_SUCCEEDED(status) && !isPartial) {
 794     // We update the cache entry size here because this is where we finish
 795     // loading compressed source data, which is part of our size calculus.
 796     UpdateCacheEntrySize();
 797
 798   } else if (isPartial) {
 799     // Remove the partial image from the cache.
 800     this->EvictFromCache();
 801
 802   } else {
 803     mImageErrorCode = status;
 804
 805     // if the error isn't "just" a partial transfer
 806     // stops animations, removes from cache
 807     this->Cancel(status);
 808   }
 809
 810   if (!image) {
 811     // We have to fire the OnStopRequest notifications ourselves because there's
 812     // no image capable of doing so.
 813     Progress progress =
 814         LoadCompleteProgress(lastPart, /* aError = */ false, status);
 815
 816     RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 817     progressTracker->SyncNotifyProgress(progress);
 818   }
 819
 820   mTimedChannel = nullptr;
 821   return NS_OK;
 822 }
 823
 824 struct mimetype_closure {
 825   nsACString* newType;
 826 };
 827
 828 /* prototype for these defined below */
 829 static nsresult sniff_mimetype_callback(nsIInputStream* in, void* closure,
 830                                         const char* fromRawSegment,
 831                                         uint32_t toOffset, uint32_t count,
 832                                         uint32_t* writeCount);
 833
 834 /** nsThreadRetargetableStreamListener methods **/
 835 NS_IMETHODIMP
 836 imgRequest::CheckListenerChain() {
 837   // TODO Might need more checking here.
 838   NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!");
 839   return NS_OK;
 840 }
 841
 842 /** nsIStreamListener methods **/
 843
 844 struct NewPartResult final {
 845   explicit NewPartResult(image::Image* aExistingImage)
 846       : mImage(aExistingImage),
 847         mIsFirstPart(!aExistingImage),
 848         mSucceeded(false),
 849         mShouldResetCacheEntry(false) {}
 850
 851   nsAutoCString mContentType;
 852   nsAutoCString mContentDisposition;
 853   RefPtr<image::Image> mImage;
 854   const bool mIsFirstPart;
 855   bool mSucceeded;
 856   bool mShouldResetCacheEntry;
 857 };
 858
 859 static NewPartResult PrepareForNewPart(nsIRequest* aRequest,
 860                                        nsIInputStream* aInStr, uint32_t aCount,
 861                                        nsIURI* aURI, bool aIsMultipart,
 862                                        image::Image* aExistingImage,
 863                                        ProgressTracker* aProgressTracker,
 864                                        uint64_t aInnerWindowId) {
 865   NewPartResult result(aExistingImage);
 866
 867   if (aInStr) {
 868     mimetype_closure closure;
 869     closure.newType = &result.mContentType;
 870
 871     // Look at the first few bytes and see if we can tell what the data is from
 872     // that since servers tend to lie. :(
 873     uint32_t out;
 874     aInStr->ReadSegments(sniff_mimetype_callback, &closure, aCount, &out);
 875   }
 876
 877   nsCOMPtr<nsIChannel> chan(do_QueryInterface(aRequest));
 878   if (result.mContentType.IsEmpty()) {
 879     nsresult rv =
 880         chan ? chan->GetContentType(result.mContentType) : NS_ERROR_FAILURE;
 881     if (NS_FAILED(rv)) {
 882       MOZ_LOG(gImgLog, LogLevel::Error,
 883               ("imgRequest::PrepareForNewPart -- "
 884                "Content type unavailable from the channel\n"));
 885       if (!aIsMultipart) {
 886         return result;
 887       }
 888     }
 889   }
 890
 891   if (chan) {
 892     chan->GetContentDispositionHeader(result.mContentDisposition);
 893   }
 894
 895   MOZ_LOG(gImgLog, LogLevel::Debug,
 896           ("imgRequest::PrepareForNewPart -- Got content type %s\n",
 897            result.mContentType.get()));
 898
 899   // XXX If server lied about mimetype and it's SVG, we may need to copy
 900   // the data and dispatch back to the main thread, AND tell the channel to
 901   // dispatch there in the future.
 902
 903   // Create the new image and give it ownership of our ProgressTracker.
 904   if (aIsMultipart) {
 905     // Create the ProgressTracker and image for this part.
 906     RefPtr<ProgressTracker> progressTracker = new ProgressTracker();
 907     RefPtr<image::Image> partImage = image::ImageFactory::CreateImage(
 908         aRequest, progressTracker, result.mContentType, aURI,
 909         /* aIsMultipart = */ true, aInnerWindowId);
 910
 911     if (result.mIsFirstPart) {
 912       // First part for a multipart channel. Create the MultipartImage wrapper.
 913       MOZ_ASSERT(aProgressTracker, "Shouldn't have given away tracker yet");
 914       aProgressTracker->SetIsMultipart();
 915       result.mImage = image::ImageFactory::CreateMultipartImage(
 916           partImage, aProgressTracker);
 917     } else {
 918       // Transition to the new part.
 919       auto multipartImage = static_cast<MultipartImage*>(aExistingImage);
 920       multipartImage->BeginTransitionToPart(partImage);
 921
 922       // Reset our cache entry size so it doesn't keep growing without bound.
 923       result.mShouldResetCacheEntry = true;
 924     }
 925   } else {
 926     MOZ_ASSERT(!aExistingImage, "New part for non-multipart channel?");
 927     MOZ_ASSERT(aProgressTracker, "Shouldn't have given away tracker yet");
 928
 929     // Create an image using our progress tracker.
 930     result.mImage = image::ImageFactory::CreateImage(
 931         aRequest, aProgressTracker, result.mContentType, aURI,
 932         /* aIsMultipart = */ false, aInnerWindowId);
 933   }
 934
 935   MOZ_ASSERT(result.mImage);
 936   if (!result.mImage->HasError() || aIsMultipart) {
 937     // We allow multipart images to fail to initialize (which generally
 938     // indicates a bad content type) without cancelling the load, because
 939     // subsequent parts might be fine.
 940     result.mSucceeded = true;
 941   }
 942
 943   return result;
 944 }
 945
 946 class FinishPreparingForNewPartRunnable final : public Runnable {
 947  public:
 948   FinishPreparingForNewPartRunnable(imgRequest* aImgRequest,
 949                                     NewPartResult&& aResult)
 950       : Runnable("FinishPreparingForNewPartRunnable"),
 951         mImgRequest(aImgRequest),
 952         mResult(aResult) {
 953     MOZ_ASSERT(aImgRequest);
 954   }
 955
 956   NS_IMETHOD Run() override {
 957     mImgRequest->FinishPreparingForNewPart(mResult);
 958     return NS_OK;
 959   }
 960
 961  private:
 962   RefPtr<imgRequest> mImgRequest;
 963   NewPartResult mResult;
 964 };
 965
 966 void imgRequest::FinishPreparingForNewPart(const NewPartResult& aResult) {
 967   MOZ_ASSERT(NS_IsMainThread());
 968
 969   mContentType = aResult.mContentType;
 970
 971   SetProperties(aResult.mContentType, aResult.mContentDisposition);
 972
 973   if (aResult.mIsFirstPart) {
 974     // Notify listeners that we have an image.
 975     mImageAvailable = true;
 976     RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
 977     progressTracker->OnImageAvailable();
 978     MOZ_ASSERT(progressTracker->HasImage());
 979   }
 980
 981   if (aResult.mShouldResetCacheEntry) {
 982     ResetCacheEntry();
 983   }
 984
 985   if (IsDecodeRequested()) {
 986     aResult.mImage->StartDecoding(imgIContainer::FLAG_NONE);
 987   }
 988 }
 989
 990 bool imgRequest::ImageAvailable() const { return mImageAvailable; }
 991
 992 NS_IMETHODIMP
 993 imgRequest::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aInStr,
 994                             uint64_t aOffset, uint32_t aCount) {
 995   LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::OnDataAvailable", "count", aCount);
 996
 997   NS_ASSERTION(aRequest, "imgRequest::OnDataAvailable -- no request!");
 998
 999   RefPtr<Image> image;
1000   RefPtr<ProgressTracker> progressTracker;
1001   bool isMultipart = false;
1002   bool newPartPending = false;
1003   uint64_t innerWindowId = 0;
1004
1005   // Retrieve and update our state.
1006   {
1007     MutexAutoLock lock(mMutex);
1008     image = mImage;
1009     progressTracker = mProgressTracker;
1010     isMultipart = mIsMultiPartChannel;
1011     newPartPending = mNewPartPending;
1012     mNewPartPending = false;
1013     innerWindowId = mInnerWindowId;
1014   }
1015
1016   // If this is a new part, we need to sniff its content type and create an
1017   // appropriate image.
1018   if (newPartPending) {
1019     NewPartResult result =
1020         PrepareForNewPart(aRequest, aInStr, aCount, mURI, isMultipart, image,
1021                           progressTracker, innerWindowId);
1022     bool succeeded = result.mSucceeded;
1023
1024     if (result.mImage) {
1025       image = result.mImage;
1026       nsCOMPtr<nsIEventTarget> eventTarget;
1027
1028       // Update our state to reflect this new part.
1029       {
1030         MutexAutoLock lock(mMutex);
1031         mImage = image;
1032
1033         // We only get an event target if we are not on the main thread, because
1034         // we have to dispatch in that case. If we are on the main thread, but
1035         // on a different scheduler group than ProgressTracker would give us,
1036         // that is okay because nothing in imagelib requires that, just our
1037         // listeners (which have their own checks).
1038         if (!NS_IsMainThread()) {
1039           eventTarget = mProgressTracker->GetEventTarget();
1040           MOZ_ASSERT(eventTarget);
1041         }
1042
1043         mProgressTracker = nullptr;
1044       }
1045
1046       // Some property objects are not threadsafe, and we need to send
1047       // OnImageAvailable on the main thread, so finish on the main thread.
1048       if (!eventTarget) {
1049         MOZ_ASSERT(NS_IsMainThread());
1050         FinishPreparingForNewPart(result);
1051       } else {
1052         nsCOMPtr<nsIRunnable> runnable =
1053             new FinishPreparingForNewPartRunnable(this, std::move(result));
1054         eventTarget->Dispatch(CreateRenderBlockingRunnable(runnable.forget()),
1055                               NS_DISPATCH_NORMAL);
1056       }
1057     }
1058
1059     if (!succeeded) {
1060       // Something went wrong; probably a content type issue.
1061       Cancel(NS_IMAGELIB_ERROR_FAILURE);
1062       return NS_BINDING_ABORTED;
1063     }
1064   }
1065
1066   // Notify the image that it has new data.
1067   if (aInStr) {
1068     nsresult rv =
1069         image->OnImageDataAvailable(aRequest, aInStr, aOffset, aCount);
1070
1071     if (NS_FAILED(rv)) {
1072       MOZ_LOG(gImgLog, LogLevel::Warning,
1073               ("[this=%p] imgRequest::OnDataAvailable -- "
1074                "copy to RasterImage failed\n",
1075                this));
1076       Cancel(NS_IMAGELIB_ERROR_FAILURE);
1077       return NS_BINDING_ABORTED;
1078     }
1079   }
1080
1081   return NS_OK;
1082 }
1083
1084 void imgRequest::SetProperties(const nsACString& aContentType,
1085                                const nsACString& aContentDisposition) {
1086   /* set our mimetype as a property */
1087   nsCOMPtr<nsISupportsCString> contentType =
1088       do_CreateInstance("@mozilla.org/supports-cstring;1");
1089   if (contentType) {
1090     contentType->SetData(aContentType);
1091     mProperties->Set("type", contentType);
1092   }
1093
1094   /* set our content disposition as a property */
1095   if (!aContentDisposition.IsEmpty()) {
1096     nsCOMPtr<nsISupportsCString> contentDisposition =
1097         do_CreateInstance("@mozilla.org/supports-cstring;1");
1098     if (contentDisposition) {
1099       contentDisposition->SetData(aContentDisposition);
1100       mProperties->Set("content-disposition", contentDisposition);
1101     }
1102   }
1103 }
1104
1105 static nsresult sniff_mimetype_callback(nsIInputStream* in, void* data,
1106                                         const char* fromRawSegment,
1107                                         uint32_t toOffset, uint32_t count,
1108                                         uint32_t* writeCount) {
1109   mimetype_closure* closure = static_cast<mimetype_closure*>(data);
1110
1111   NS_ASSERTION(closure, "closure is null!");
1112
1113   if (count > 0) {
1114     imgLoader::GetMimeTypeFromContent(fromRawSegment, count, *closure->newType);
1115   }
1116
1117   *writeCount = 0;
1118   return NS_ERROR_FAILURE;
1119 }
1120
1121 /** nsIInterfaceRequestor methods **/
1122
1123 NS_IMETHODIMP
1124 imgRequest::GetInterface(const nsIID& aIID, void** aResult) {
1125   if (!mPrevChannelSink || aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
1126     return QueryInterface(aIID, aResult);
1127   }
1128
1129   NS_ASSERTION(
1130       mPrevChannelSink != this,
1131       "Infinite recursion - don't keep track of channel sinks that are us!");
1132   return mPrevChannelSink->GetInterface(aIID, aResult);
1133 }
1134
1135 /** nsIChannelEventSink methods **/
1136 NS_IMETHODIMP
1137 imgRequest::AsyncOnChannelRedirect(nsIChannel* oldChannel,
1138                                    nsIChannel* newChannel, uint32_t flags,
1139                                    nsIAsyncVerifyRedirectCallback* callback) {
1140   NS_ASSERTION(mRequest && mChannel,
1141                "Got a channel redirect after we nulled out mRequest!");
1142   NS_ASSERTION(mChannel == oldChannel,
1143                "Got a channel redirect for an unknown channel!");
1144   NS_ASSERTION(newChannel, "Got a redirect to a NULL channel!");
1145
1146   SetCacheValidation(mCacheEntry, oldChannel);
1147
1148   // Prepare for callback
1149   mRedirectCallback = callback;
1150   mNewRedirectChannel = newChannel;
1151
1152   nsCOMPtr<nsIChannelEventSink> sink(do_GetInterface(mPrevChannelSink));
1153   if (sink) {
1154     nsresult rv =
1155         sink->AsyncOnChannelRedirect(oldChannel, newChannel, flags, this);
1156     if (NS_FAILED(rv)) {
1157       mRedirectCallback = nullptr;
1158       mNewRedirectChannel = nullptr;
1159     }
1160     return rv;
1161   }
1162
1163   (void)OnRedirectVerifyCallback(NS_OK);
1164   return NS_OK;
1165 }
1166
1167 NS_IMETHODIMP
1168 imgRequest::OnRedirectVerifyCallback(nsresult result) {
1169   NS_ASSERTION(mRedirectCallback, "mRedirectCallback not set in callback");
1170   NS_ASSERTION(mNewRedirectChannel, "mNewRedirectChannel not set in callback");
1171
1172   if (NS_FAILED(result)) {
1173     mRedirectCallback->OnRedirectVerifyCallback(result);
1174     mRedirectCallback = nullptr;
1175     mNewRedirectChannel = nullptr;
1176     return NS_OK;
1177   }
1178
1179   mChannel = mNewRedirectChannel;
1180   mTimedChannel = do_QueryInterface(mChannel);
1181   mNewRedirectChannel = nullptr;
1182
1183   if (LOG_TEST(LogLevel::Debug)) {
1184     LOG_MSG_WITH_PARAM(gImgLog, "imgRequest::OnChannelRedirect", "old",
1185                        mFinalURI ? mFinalURI->GetSpecOrDefault().get() : "");
1186   }
1187
1188   // If the previous URI is a non-HTTPS URI, record that fact for later use by
1189   // security code, which needs to know whether there is an insecure load at any
1190   // point in the redirect chain.
1191   bool schemeLocal = false;
1192   if (NS_FAILED(NS_URIChainHasFlags(mFinalURI,
1193                                     nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
1194                                     &schemeLocal)) ||
1195       (!mFinalURI->SchemeIs("https") && !mFinalURI->SchemeIs("chrome") &&
1196        !schemeLocal)) {
1197     MutexAutoLock lock(mMutex);
1198
1199     // The csp directive upgrade-insecure-requests performs an internal redirect
1200     // to upgrade all requests from http to https before any data is fetched
1201     // from the network. Do not pollute mHadInsecureRedirect in case of such an
1202     // internal redirect.
1203     nsCOMPtr<nsILoadInfo> loadInfo = mChannel->LoadInfo();
1204     bool upgradeInsecureRequests =
1205         loadInfo ? loadInfo->GetUpgradeInsecureRequests() ||
1206                        loadInfo->GetBrowserUpgradeInsecureRequests()
1207                  : false;
1208     if (!upgradeInsecureRequests) {
1209       mHadInsecureRedirect = true;
1210     }
1211   }
1212
1213   // Update the final URI.
1214   mChannel->GetURI(getter_AddRefs(mFinalURI));
1215
1216   if (LOG_TEST(LogLevel::Debug)) {
1217     LOG_MSG_WITH_PARAM(gImgLog, "imgRequest::OnChannelRedirect", "new",
1218                        mFinalURI ? mFinalURI->GetSpecOrDefault().get() : "");
1219   }
1220
1221   // Make sure we have a protocol that returns data rather than opens an
1222   // external application, e.g. 'mailto:'.
1223   bool doesNotReturnData = false;
1224   nsresult rv = NS_URIChainHasFlags(
1225       mFinalURI, nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA,
1226       &doesNotReturnData);
1227
1228   if (NS_SUCCEEDED(rv) && doesNotReturnData) {
1229     rv = NS_ERROR_ABORT;
1230   }
1231
1232   if (NS_FAILED(rv)) {
1233     mRedirectCallback->OnRedirectVerifyCallback(rv);
1234     mRedirectCallback = nullptr;
1235     return NS_OK;
1236   }
1237
1238   mRedirectCallback->OnRedirectVerifyCallback(NS_OK);
1239   mRedirectCallback = nullptr;
1240   return NS_OK;
1241 }