/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set ts=4 sw=4 sts=4 et: */
/* 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 "nsViewSourceChannel.h"
#include "nsIIOService.h"
#include "nsMimeTypes.h"
#include "nsNetUtil.h"
#include "nsContentUtils.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsContentSecurityManager.h"
#include "NullPrincipal.h"
#include "nsServiceManagerUtils.h"
#include "nsIInputStreamChannel.h"
#include "mozilla/DebugOnly.h"

NS_IMPL_ADDREF(nsViewSourceChannel)
NS_IMPL_RELEASE(nsViewSourceChannel)
/*
  This QI uses NS_INTERFACE_MAP_ENTRY_CONDITIONAL to check for
  non-nullness of mHttpChannel, mCachingChannel, and mUploadChannel.
*/
NS_INTERFACE_MAP_BEGIN(nsViewSourceChannel)
  NS_INTERFACE_MAP_ENTRY(nsIViewSourceChannel)
  NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
  NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIHttpChannel, mHttpChannel)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIHttpChannelInternal,
                                     mHttpChannelInternal)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsICachingChannel, mCachingChannel)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsICacheInfoChannel, mCacheInfoChannel)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIApplicationCacheChannel,
                                     mApplicationCacheChannel)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIUploadChannel, mUploadChannel)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIFormPOSTActionChannel, mPostChannel)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsIRequest, nsIViewSourceChannel)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsIChannel, nsIViewSourceChannel)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIViewSourceChannel)
NS_INTERFACE_MAP_END

nsresult nsViewSourceChannel::Init(nsIURI *uri) {
  mOriginalURI = uri;

  nsAutoCString path;
  nsresult rv = uri->GetPathQueryRef(path);
  if (NS_FAILED(rv)) return rv;

  nsCOMPtr<nsIIOService> pService(do_GetIOService(&rv));
  if (NS_FAILED(rv)) return rv;

  nsAutoCString scheme;
  rv = pService->ExtractScheme(path, scheme);
  if (NS_FAILED(rv)) return rv;

  // prevent viewing source of javascript URIs (see bug 204779)
  if (scheme.EqualsLiteral("javascript")) {
    NS_WARNING("blocking view-source:javascript:");
    return NS_ERROR_INVALID_ARG;
  }

  // This function is called from within nsViewSourceHandler::NewChannel2
  // and sets the right loadInfo right after returning from this function.
  // Until then we follow the principal of least privilege and use
  // nullPrincipal as the loadingPrincipal and the least permissive
  // securityflag.
  nsCOMPtr<nsIPrincipal> nullPrincipal = NullPrincipal::Create();

  rv = pService->NewChannel2(
      path,
      nullptr,  // aOriginCharset
      nullptr,  // aCharSet
      nullptr,  // aLoadingNode
      nullPrincipal,
      nullptr,  // aTriggeringPrincipal
      nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED,
      nsIContentPolicy::TYPE_OTHER, getter_AddRefs(mChannel));
  NS_ENSURE_SUCCESS(rv, rv);

  mIsSrcdocChannel = false;

  mChannel->SetOriginalURI(mOriginalURI);
  mHttpChannel = do_QueryInterface(mChannel);
  mHttpChannelInternal = do_QueryInterface(mChannel);
  mCachingChannel = do_QueryInterface(mChannel);
  mCacheInfoChannel = do_QueryInterface(mChannel);
  mApplicationCacheChannel = do_QueryInterface(mChannel);
  mUploadChannel = do_QueryInterface(mChannel);
  mPostChannel = do_QueryInterface(mChannel);

  return NS_OK;
}

nsresult nsViewSourceChannel::InitSrcdoc(nsIURI *aURI, nsIURI *aBaseURI,
                                         const nsAString &aSrcdoc,
                                         nsILoadInfo *aLoadInfo) {
  nsresult rv;

  nsCOMPtr<nsIURI> inStreamURI;
  // Need to strip view-source: from the URI.  Hardcoded to
  // about:srcdoc as this is the only permissible URI for srcdoc
  // loads
  rv =
      NS_NewURI(getter_AddRefs(inStreamURI), NS_LITERAL_STRING("about:srcdoc"));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = NS_NewInputStreamChannelInternal(
      getter_AddRefs(mChannel), inStreamURI, aSrcdoc,
      NS_LITERAL_CSTRING("text/html"), aLoadInfo, true);

  NS_ENSURE_SUCCESS(rv, rv);
  mOriginalURI = aURI;
  mIsSrcdocChannel = true;

  mChannel->SetOriginalURI(mOriginalURI);
  mHttpChannel = do_QueryInterface(mChannel);
  mHttpChannelInternal = do_QueryInterface(mChannel);
  mCachingChannel = do_QueryInterface(mChannel);
  mCacheInfoChannel = do_QueryInterface(mChannel);
  mApplicationCacheChannel = do_QueryInterface(mChannel);
  mUploadChannel = do_QueryInterface(mChannel);

  rv = UpdateLoadInfoResultPrincipalURI();
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIInputStreamChannel> isc = do_QueryInterface(mChannel);
  MOZ_ASSERT(isc);
  isc->SetBaseURI(aBaseURI);
  return NS_OK;
}

nsresult nsViewSourceChannel::UpdateLoadInfoResultPrincipalURI() {
  nsresult rv;

  MOZ_ASSERT(mChannel);

  nsCOMPtr<nsILoadInfo> channelLoadInfo = mChannel->GetLoadInfo();
  if (!channelLoadInfo) {
    return NS_OK;
  }

  nsCOMPtr<nsIURI> channelResultPrincipalURI;
  rv = channelLoadInfo->GetResultPrincipalURI(
      getter_AddRefs(channelResultPrincipalURI));
  if (NS_FAILED(rv)) {
    return rv;
  }

  if (!channelResultPrincipalURI) {
    mChannel->GetOriginalURI(getter_AddRefs(channelResultPrincipalURI));
    return NS_OK;
  }

  if (!channelResultPrincipalURI) {
    return NS_ERROR_UNEXPECTED;
  }

  bool alreadyViewSource;
  if (NS_SUCCEEDED(channelResultPrincipalURI->SchemeIs("view-source",
                                                       &alreadyViewSource)) &&
      alreadyViewSource) {
    return NS_OK;
  }

  nsCOMPtr<nsIURI> updatedResultPrincipalURI;
  rv = BuildViewSourceURI(channelResultPrincipalURI,
                          getter_AddRefs(updatedResultPrincipalURI));
  if (NS_FAILED(rv)) {
    return rv;
  }

  rv = channelLoadInfo->SetResultPrincipalURI(updatedResultPrincipalURI);
  if (NS_FAILED(rv)) {
    return rv;
  }

  return NS_OK;
}

nsresult nsViewSourceChannel::BuildViewSourceURI(nsIURI *aURI,
                                                 nsIURI **aResult) {
  nsresult rv;

  // protect ourselves against broken channel implementations
  if (!aURI) {
    NS_ERROR("no URI to build view-source uri!");
    return NS_ERROR_UNEXPECTED;
  }

  nsAutoCString spec;
  rv = aURI->GetSpec(spec);
  if (NS_FAILED(rv)) {
    return rv;
  }

  return NS_NewURI(aResult,
                   /* XXX Gross hack -- NS_NewURI goes into an infinite loop on
                   non-flat specs.  See bug 136980 */
                   nsAutoCString(NS_LITERAL_CSTRING("view-source:") + spec),
                   nullptr);
}

////////////////////////////////////////////////////////////////////////////////
// nsIRequest methods:

NS_IMETHODIMP
nsViewSourceChannel::GetName(nsACString &result) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsViewSourceChannel::GetTransferSize(uint64_t *aTransferSize) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsViewSourceChannel::GetDecodedBodySize(uint64_t *aDecodedBodySize) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsViewSourceChannel::GetEncodedBodySize(uint64_t *aEncodedBodySize) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsViewSourceChannel::IsPending(bool *result) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->IsPending(result);
}

NS_IMETHODIMP
nsViewSourceChannel::GetStatus(nsresult *status) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetStatus(status);
}

NS_IMETHODIMP
nsViewSourceChannel::Cancel(nsresult status) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->Cancel(status);
}

NS_IMETHODIMP
nsViewSourceChannel::Suspend(void) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->Suspend();
}

NS_IMETHODIMP
nsViewSourceChannel::Resume(void) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->Resume();
}

////////////////////////////////////////////////////////////////////////////////
// nsIChannel methods:

NS_IMETHODIMP
nsViewSourceChannel::GetOriginalURI(nsIURI **aURI) {
  NS_ASSERTION(aURI, "Null out param!");
  *aURI = mOriginalURI;
  NS_ADDREF(*aURI);
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::SetOriginalURI(nsIURI *aURI) {
  NS_ENSURE_ARG_POINTER(aURI);
  mOriginalURI = aURI;
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::GetURI(nsIURI **aURI) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  nsCOMPtr<nsIURI> uri;
  nsresult rv = mChannel->GetURI(getter_AddRefs(uri));
  if (NS_FAILED(rv)) {
    return rv;
  }

  return BuildViewSourceURI(uri, aURI);
}

NS_IMETHODIMP
nsViewSourceChannel::Open(nsIInputStream **_retval) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  nsresult rv = NS_MaybeOpenChannelUsingOpen2(mChannel, _retval);
  if (NS_SUCCEEDED(rv)) {
    mOpened = true;
  }
  return rv;
}

NS_IMETHODIMP
nsViewSourceChannel::Open2(nsIInputStream **aStream) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);
  nsCOMPtr<nsILoadInfo> loadInfo = mChannel->GetLoadInfo();
  if (!loadInfo) {
    MOZ_ASSERT(loadInfo, "can not enforce security without loadInfo");
    return NS_ERROR_UNEXPECTED;
  }
  // setting the flag on the loadInfo indicates that the underlying
  // channel will be openend using Open2() and hence performs
  // the necessary security checks.
  loadInfo->SetEnforceSecurity(true);
  return Open(aStream);
}

NS_IMETHODIMP
nsViewSourceChannel::AsyncOpen(nsIStreamListener *aListener,
                               nsISupports *ctxt) {
#ifdef DEBUG
  {
    nsCOMPtr<nsILoadInfo> loadInfo = mChannel->GetLoadInfo();
    MOZ_ASSERT(!loadInfo || loadInfo->GetSecurityMode() == 0 ||
                   loadInfo->GetEnforceSecurity(),
               "security flags in loadInfo but asyncOpen2() not called");
  }
#endif

  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  mListener = aListener;

  /*
   * We want to add ourselves to the loadgroup before opening
   * mChannel, since we want to make sure we're in the loadgroup
   * when mChannel finishes and fires OnStopRequest()
   */

  nsCOMPtr<nsILoadGroup> loadGroup;
  mChannel->GetLoadGroup(getter_AddRefs(loadGroup));
  if (loadGroup)
    loadGroup->AddRequest(static_cast<nsIViewSourceChannel *>(this), nullptr);

  nsresult rv = NS_OK;
  nsCOMPtr<nsILoadInfo> loadInfo = mChannel->GetLoadInfo();
  if (loadInfo && loadInfo->GetEnforceSecurity()) {
    rv = mChannel->AsyncOpen2(this);
  } else {
    rv = mChannel->AsyncOpen(this, ctxt);
  }

  if (NS_FAILED(rv) && loadGroup)
    loadGroup->RemoveRequest(static_cast<nsIViewSourceChannel *>(this), nullptr,
                             rv);

  if (NS_SUCCEEDED(rv)) {
    mOpened = true;
  }

  return rv;
}

NS_IMETHODIMP
nsViewSourceChannel::AsyncOpen2(nsIStreamListener *aListener) {
  nsCOMPtr<nsILoadInfo> loadInfo = mChannel->GetLoadInfo();
  if (!loadInfo) {
    MOZ_ASSERT(loadInfo, "can not enforce security without loadInfo");
    return NS_ERROR_UNEXPECTED;
  }
  // setting the flag on the loadInfo indicates that the underlying
  // channel will be openend using AsyncOpen2() and hence performs
  // the necessary security checks.
  loadInfo->SetEnforceSecurity(true);
  return AsyncOpen(aListener, nullptr);
}
/*
 * Both the view source channel and mChannel are added to the
 * loadgroup.  There should never be more than one request in the
 * loadgroup that has LOAD_DOCUMENT_URI set.  The one that has this
 * flag set is the request whose URI is used to refetch the document,
 * so it better be the viewsource channel.
 *
 * Therefore, we need to make sure that
 * 1) The load flags on mChannel _never_ include LOAD_DOCUMENT_URI
 * 2) The load flags on |this| include LOAD_DOCUMENT_URI when it was
 *    set via SetLoadFlags (mIsDocument keeps track of this flag).
 */

NS_IMETHODIMP
nsViewSourceChannel::GetLoadFlags(uint32_t *aLoadFlags) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  nsresult rv = mChannel->GetLoadFlags(aLoadFlags);
  if (NS_FAILED(rv)) return rv;

  // This should actually be just LOAD_DOCUMENT_URI but the win32 compiler
  // fails to deal due to amiguous inheritance.  nsIChannel::LOAD_DOCUMENT_URI
  // also fails; the Win32 compiler thinks that's supposed to be a method.
  if (mIsDocument) *aLoadFlags |= ::nsIChannel::LOAD_DOCUMENT_URI;

  return rv;
}

NS_IMETHODIMP
nsViewSourceChannel::SetLoadFlags(uint32_t aLoadFlags) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  // "View source" always wants the currently cached content.
  // We also want to have _this_ channel, not mChannel to be the
  // 'document' channel in the loadgroup.

  // These should actually be just LOAD_FROM_CACHE and LOAD_DOCUMENT_URI but
  // the win32 compiler fails to deal due to amiguous inheritance.
  // nsIChannel::LOAD_DOCUMENT_URI/nsIRequest::LOAD_FROM_CACHE also fails; the
  // Win32 compiler thinks that's supposed to be a method.
  mIsDocument = (aLoadFlags & ::nsIChannel::LOAD_DOCUMENT_URI) ? true : false;

  nsresult rv =
      mChannel->SetLoadFlags((aLoadFlags | ::nsIRequest::LOAD_FROM_CACHE) &
                             ~::nsIChannel::LOAD_DOCUMENT_URI);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (mHttpChannel) {
    rv = mHttpChannel->SetIsMainDocumentChannel(
        aLoadFlags & ::nsIChannel::LOAD_DOCUMENT_URI);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
  }

  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::GetContentType(nsACString &aContentType) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  aContentType.Truncate();

  if (mContentType.IsEmpty()) {
    // Get the current content type
    nsresult rv;
    nsAutoCString contentType;
    rv = mChannel->GetContentType(contentType);
    if (NS_FAILED(rv)) return rv;

    // If we don't know our type, just say so.  The unknown
    // content decoder will then kick in automatically, and it
    // will call our SetOriginalContentType method instead of our
    // SetContentType method to set the type it determines.
    if (!contentType.EqualsLiteral(UNKNOWN_CONTENT_TYPE)) {
      contentType = VIEWSOURCE_CONTENT_TYPE;
    }

    mContentType = contentType;
  }

  aContentType = mContentType;
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::SetContentType(const nsACString &aContentType) {
  // Our GetContentType() currently returns VIEWSOURCE_CONTENT_TYPE
  //
  // However, during the parsing phase the parser calls our
  // channel's GetContentType(). Returning the string above trips up
  // the parser. In order to avoid messy changes and not to have the
  // parser depend on nsIViewSourceChannel Vidur proposed the
  // following solution:
  //
  // The ViewSourceChannel initially returns a content type of
  // VIEWSOURCE_CONTENT_TYPE.  Based on this type decisions to
  // create a viewer for doing a view source are made.  After the
  // viewer is created, nsLayoutDLF::CreateInstance() calls this
  // SetContentType() with the original content type.  When it's
  // time for the parser to find out the content type it will call
  // our channel's GetContentType() and it will get the original
  // content type, such as, text/html and everything is kosher from
  // then on.

  if (!mOpened) {
    // We do not take hints
    return NS_ERROR_NOT_AVAILABLE;
  }

  mContentType = aContentType;
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::GetContentCharset(nsACString &aContentCharset) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetContentCharset(aContentCharset);
}

NS_IMETHODIMP
nsViewSourceChannel::SetContentCharset(const nsACString &aContentCharset) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->SetContentCharset(aContentCharset);
}

// We don't forward these methods becacuse content-disposition isn't whitelisted
// (see GetResponseHeader/VisitResponseHeaders).
NS_IMETHODIMP
nsViewSourceChannel::GetContentDisposition(uint32_t *aContentDisposition) {
  return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP
nsViewSourceChannel::SetContentDisposition(uint32_t aContentDisposition) {
  return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP
nsViewSourceChannel::GetContentDispositionFilename(
    nsAString &aContentDispositionFilename) {
  return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP
nsViewSourceChannel::SetContentDispositionFilename(
    const nsAString &aContentDispositionFilename) {
  return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP
nsViewSourceChannel::GetContentDispositionHeader(
    nsACString &aContentDispositionHeader) {
  return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP
nsViewSourceChannel::GetContentLength(int64_t *aContentLength) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetContentLength(aContentLength);
}

NS_IMETHODIMP
nsViewSourceChannel::SetContentLength(int64_t aContentLength) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->SetContentLength(aContentLength);
}

NS_IMETHODIMP
nsViewSourceChannel::GetLoadGroup(nsILoadGroup **aLoadGroup) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetLoadGroup(aLoadGroup);
}

NS_IMETHODIMP
nsViewSourceChannel::SetLoadGroup(nsILoadGroup *aLoadGroup) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->SetLoadGroup(aLoadGroup);
}

NS_IMETHODIMP
nsViewSourceChannel::GetOwner(nsISupports **aOwner) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetOwner(aOwner);
}

NS_IMETHODIMP
nsViewSourceChannel::SetOwner(nsISupports *aOwner) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->SetOwner(aOwner);
}

NS_IMETHODIMP
nsViewSourceChannel::GetLoadInfo(nsILoadInfo **aLoadInfo) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetLoadInfo(aLoadInfo);
}

NS_IMETHODIMP
nsViewSourceChannel::SetLoadInfo(nsILoadInfo *aLoadInfo) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->SetLoadInfo(aLoadInfo);
}

NS_IMETHODIMP
nsViewSourceChannel::GetIsDocument(bool *aIsDocument) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetIsDocument(aIsDocument);
}

NS_IMETHODIMP
nsViewSourceChannel::GetNotificationCallbacks(
    nsIInterfaceRequestor **aNotificationCallbacks) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetNotificationCallbacks(aNotificationCallbacks);
}

NS_IMETHODIMP
nsViewSourceChannel::SetNotificationCallbacks(
    nsIInterfaceRequestor *aNotificationCallbacks) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->SetNotificationCallbacks(aNotificationCallbacks);
}

NS_IMETHODIMP
nsViewSourceChannel::GetSecurityInfo(nsISupports **aSecurityInfo) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetSecurityInfo(aSecurityInfo);
}

// nsIViewSourceChannel methods
NS_IMETHODIMP
nsViewSourceChannel::GetOriginalContentType(nsACString &aContentType) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  return mChannel->GetContentType(aContentType);
}

NS_IMETHODIMP
nsViewSourceChannel::SetOriginalContentType(const nsACString &aContentType) {
  NS_ENSURE_TRUE(mChannel, NS_ERROR_FAILURE);

  // clear our cached content-type value
  mContentType.Truncate();

  return mChannel->SetContentType(aContentType);
}

NS_IMETHODIMP
nsViewSourceChannel::GetIsSrcdocChannel(bool *aIsSrcdocChannel) {
  *aIsSrcdocChannel = mIsSrcdocChannel;
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::GetBaseURI(nsIURI **aBaseURI) {
  if (mIsSrcdocChannel) {
    nsCOMPtr<nsIInputStreamChannel> isc = do_QueryInterface(mChannel);
    if (isc) {
      return isc->GetBaseURI(aBaseURI);
    }
  }
  *aBaseURI = mBaseURI;
  NS_IF_ADDREF(*aBaseURI);
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::SetBaseURI(nsIURI *aBaseURI) {
  mBaseURI = aBaseURI;
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::GetProtocolVersion(nsACString &aProtocolVersion) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

// nsIRequestObserver methods
NS_IMETHODIMP
nsViewSourceChannel::OnStartRequest(nsIRequest *aRequest,
                                    nsISupports *aContext) {
  NS_ENSURE_TRUE(mListener, NS_ERROR_FAILURE);
  // The channel may have gotten redirected... Time to update our info
  mChannel = do_QueryInterface(aRequest);
  mHttpChannel = do_QueryInterface(aRequest);
  mCachingChannel = do_QueryInterface(aRequest);
  mCacheInfoChannel = do_QueryInterface(mChannel);
  mUploadChannel = do_QueryInterface(aRequest);

  nsresult rv = UpdateLoadInfoResultPrincipalURI();
  if (NS_FAILED(rv)) {
    Cancel(rv);
  }

  return mListener->OnStartRequest(static_cast<nsIViewSourceChannel *>(this),
                                   aContext);
}

NS_IMETHODIMP
nsViewSourceChannel::OnStopRequest(nsIRequest *aRequest, nsISupports *aContext,
                                   nsresult aStatus) {
  NS_ENSURE_TRUE(mListener, NS_ERROR_FAILURE);
  if (mChannel) {
    nsCOMPtr<nsILoadGroup> loadGroup;
    mChannel->GetLoadGroup(getter_AddRefs(loadGroup));
    if (loadGroup) {
      loadGroup->RemoveRequest(static_cast<nsIViewSourceChannel *>(this),
                               nullptr, aStatus);
    }
  }
  return mListener->OnStopRequest(static_cast<nsIViewSourceChannel *>(this),
                                  aContext, aStatus);
}

// nsIStreamListener methods
NS_IMETHODIMP
nsViewSourceChannel::OnDataAvailable(nsIRequest *aRequest,
                                     nsISupports *aContext,
                                     nsIInputStream *aInputStream,
                                     uint64_t aSourceOffset, uint32_t aLength) {
  NS_ENSURE_TRUE(mListener, NS_ERROR_FAILURE);
  return mListener->OnDataAvailable(static_cast<nsIViewSourceChannel *>(this),
                                    aContext, aInputStream, aSourceOffset,
                                    aLength);
}

// nsIHttpChannel methods

// We want to forward most of nsIHttpChannel over to mHttpChannel, but we want
// to override GetRequestHeader and VisitHeaders. The reason is that we don't
// want various headers like Link: and Refresh: applying to view-source.
NS_IMETHODIMP
nsViewSourceChannel::GetChannelId(uint64_t *aChannelId) {
  NS_ENSURE_ARG_POINTER(aChannelId);
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetChannelId(aChannelId);
}

NS_IMETHODIMP
nsViewSourceChannel::SetChannelId(uint64_t aChannelId) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetChannelId(aChannelId);
}

NS_IMETHODIMP
nsViewSourceChannel::GetTopLevelContentWindowId(uint64_t *aWindowId) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetTopLevelContentWindowId(aWindowId);
}

NS_IMETHODIMP
nsViewSourceChannel::SetTopLevelContentWindowId(uint64_t aWindowId) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetTopLevelContentWindowId(aWindowId);
}

NS_IMETHODIMP
nsViewSourceChannel::GetTopLevelOuterContentWindowId(uint64_t *aWindowId) {
  return !mHttpChannel
             ? NS_ERROR_NULL_POINTER
             : mHttpChannel->GetTopLevelOuterContentWindowId(aWindowId);
}

NS_IMETHODIMP
nsViewSourceChannel::SetTopLevelOuterContentWindowId(uint64_t aWindowId) {
  return !mHttpChannel
             ? NS_ERROR_NULL_POINTER
             : mHttpChannel->SetTopLevelOuterContentWindowId(aWindowId);
}

NS_IMETHODIMP
nsViewSourceChannel::GetIsTrackingResource(bool *aIsTrackingResource) {
  return !mHttpChannel
             ? NS_ERROR_NULL_POINTER
             : mHttpChannel->GetIsTrackingResource(aIsTrackingResource);
}

NS_IMETHODIMP
nsViewSourceChannel::GetRequestMethod(nsACString &aRequestMethod) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetRequestMethod(aRequestMethod);
}

NS_IMETHODIMP
nsViewSourceChannel::SetRequestMethod(const nsACString &aRequestMethod) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetRequestMethod(aRequestMethod);
}

NS_IMETHODIMP
nsViewSourceChannel::GetReferrer(nsIURI **aReferrer) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetReferrer(aReferrer);
}

NS_IMETHODIMP
nsViewSourceChannel::SetReferrer(nsIURI *aReferrer) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetReferrer(aReferrer);
}

NS_IMETHODIMP
nsViewSourceChannel::GetReferrerPolicy(uint32_t *aReferrerPolicy) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetReferrerPolicy(aReferrerPolicy);
}

NS_IMETHODIMP
nsViewSourceChannel::SetReferrerWithPolicy(nsIURI *aReferrer,
                                           uint32_t aReferrerPolicy) {
  return !mHttpChannel
             ? NS_ERROR_NULL_POINTER
             : mHttpChannel->SetReferrerWithPolicy(aReferrer, aReferrerPolicy);
}

NS_IMETHODIMP
nsViewSourceChannel::GetRequestHeader(const nsACString &aHeader,
                                      nsACString &aValue) {
  aValue.Truncate();
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetRequestHeader(aHeader, aValue);
}

NS_IMETHODIMP
nsViewSourceChannel::SetRequestHeader(const nsACString &aHeader,
                                      const nsACString &aValue, bool aMerge) {
  return !mHttpChannel
             ? NS_ERROR_NULL_POINTER
             : mHttpChannel->SetRequestHeader(aHeader, aValue, aMerge);
}

NS_IMETHODIMP
nsViewSourceChannel::SetEmptyRequestHeader(const nsACString &aHeader) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetEmptyRequestHeader(aHeader);
}

NS_IMETHODIMP
nsViewSourceChannel::VisitRequestHeaders(nsIHttpHeaderVisitor *aVisitor) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->VisitRequestHeaders(aVisitor);
}

NS_IMETHODIMP
nsViewSourceChannel::VisitNonDefaultRequestHeaders(
    nsIHttpHeaderVisitor *aVisitor) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->VisitNonDefaultRequestHeaders(aVisitor);
}

NS_IMETHODIMP
nsViewSourceChannel::GetAllowPipelining(bool *aAllowPipelining) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetAllowPipelining(aAllowPipelining);
}

NS_IMETHODIMP
nsViewSourceChannel::SetAllowPipelining(bool aAllowPipelining) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetAllowPipelining(aAllowPipelining);
}

NS_IMETHODIMP
nsViewSourceChannel::GetAllowSTS(bool *aAllowSTS) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetAllowSTS(aAllowSTS);
}

NS_IMETHODIMP
nsViewSourceChannel::SetAllowSTS(bool aAllowSTS) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetAllowSTS(aAllowSTS);
}

NS_IMETHODIMP
nsViewSourceChannel::GetRedirectionLimit(uint32_t *aRedirectionLimit) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetRedirectionLimit(aRedirectionLimit);
}

NS_IMETHODIMP
nsViewSourceChannel::SetRedirectionLimit(uint32_t aRedirectionLimit) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetRedirectionLimit(aRedirectionLimit);
}

NS_IMETHODIMP
nsViewSourceChannel::GetResponseStatus(uint32_t *aResponseStatus) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetResponseStatus(aResponseStatus);
}

NS_IMETHODIMP
nsViewSourceChannel::GetResponseStatusText(nsACString &aResponseStatusText) {
  return !mHttpChannel
             ? NS_ERROR_NULL_POINTER
             : mHttpChannel->GetResponseStatusText(aResponseStatusText);
}

NS_IMETHODIMP
nsViewSourceChannel::GetRequestSucceeded(bool *aRequestSucceeded) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetRequestSucceeded(aRequestSucceeded);
}

NS_IMETHODIMP
nsViewSourceChannel::GetResponseHeader(const nsACString &aHeader,
                                       nsACString &aValue) {
  aValue.Truncate();
  if (!mHttpChannel) return NS_ERROR_NULL_POINTER;

  if (!aHeader.Equals(NS_LITERAL_CSTRING("Content-Type"),
                      nsCaseInsensitiveCStringComparator()) &&
      !aHeader.Equals(NS_LITERAL_CSTRING("Content-Security-Policy"),
                      nsCaseInsensitiveCStringComparator()) &&
      !aHeader.Equals(NS_LITERAL_CSTRING("Content-Security-Policy-Report-Only"),
                      nsCaseInsensitiveCStringComparator()) &&
      !aHeader.Equals(NS_LITERAL_CSTRING("X-Frame-Options"),
                      nsCaseInsensitiveCStringComparator())) {
    // We simulate the NS_ERROR_NOT_AVAILABLE error which is produced by
    // GetResponseHeader via nsHttpHeaderArray::GetHeader when the entry is
    // not present, such that it appears as though no headers except for the
    // whitelisted ones were set on this channel.
    return NS_ERROR_NOT_AVAILABLE;
  }

  return mHttpChannel->GetResponseHeader(aHeader, aValue);
}

NS_IMETHODIMP
nsViewSourceChannel::SetResponseHeader(const nsACString &header,
                                       const nsACString &value, bool merge) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetResponseHeader(header, value, merge);
}

NS_IMETHODIMP
nsViewSourceChannel::VisitResponseHeaders(nsIHttpHeaderVisitor *aVisitor) {
  if (!mHttpChannel) return NS_ERROR_NULL_POINTER;

  NS_NAMED_LITERAL_CSTRING(contentTypeStr, "Content-Type");
  nsAutoCString contentType;
  nsresult rv = mHttpChannel->GetResponseHeader(contentTypeStr, contentType);
  if (NS_SUCCEEDED(rv)) {
    return aVisitor->VisitHeader(contentTypeStr, contentType);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsViewSourceChannel::GetOriginalResponseHeader(const nsACString &aHeader,
                                               nsIHttpHeaderVisitor *aVisitor) {
  nsAutoCString value;
  nsresult rv = GetResponseHeader(aHeader, value);
  if (NS_FAILED(rv)) {
    return rv;
  }
  return aVisitor->VisitHeader(aHeader, value);
}

NS_IMETHODIMP
nsViewSourceChannel::VisitOriginalResponseHeaders(
    nsIHttpHeaderVisitor *aVisitor) {
  return VisitResponseHeaders(aVisitor);
}

NS_IMETHODIMP
nsViewSourceChannel::IsNoStoreResponse(bool *_retval) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->IsNoStoreResponse(_retval);
}

NS_IMETHODIMP
nsViewSourceChannel::IsNoCacheResponse(bool *_retval) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->IsNoCacheResponse(_retval);
}

NS_IMETHODIMP
nsViewSourceChannel::IsPrivateResponse(bool *_retval) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->IsPrivateResponse(_retval);
}

NS_IMETHODIMP
nsViewSourceChannel::RedirectTo(nsIURI *uri) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER : mHttpChannel->RedirectTo(uri);
}

NS_IMETHODIMP
nsViewSourceChannel::UpgradeToSecure() {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->UpgradeToSecure();
}

NS_IMETHODIMP
nsViewSourceChannel::GetRequestContextID(uint64_t *_retval) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetRequestContextID(_retval);
}

NS_IMETHODIMP
nsViewSourceChannel::SetRequestContextID(uint64_t rcid) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetRequestContextID(rcid);
}

NS_IMETHODIMP
nsViewSourceChannel::GetIsMainDocumentChannel(bool *aValue) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->GetIsMainDocumentChannel(aValue);
}

NS_IMETHODIMP
nsViewSourceChannel::SetIsMainDocumentChannel(bool aValue) {
  return !mHttpChannel ? NS_ERROR_NULL_POINTER
                       : mHttpChannel->SetIsMainDocumentChannel(aValue);
}

// Have to manually forward SetCorsPreflightParameters since it's [notxpcom]
void nsViewSourceChannel::SetCorsPreflightParameters(
    const nsTArray<nsCString> &aUnsafeHeaders) {
  mHttpChannelInternal->SetCorsPreflightParameters(aUnsafeHeaders);
}

void nsViewSourceChannel::SetAltDataForChild(bool aIsForChild) {
  mHttpChannelInternal->SetAltDataForChild(aIsForChild);
}

NS_IMETHODIMP
nsViewSourceChannel::LogBlockedCORSRequest(const nsAString &aMessage) {
  if (!mHttpChannel) {
    NS_WARNING(
        "nsViewSourceChannel::LogBlockedCORSRequest mHttpChannel is null");
    return NS_ERROR_UNEXPECTED;
  }
  return mHttpChannel->LogBlockedCORSRequest(aMessage);
}