uriloader/exthandler/nsMIMEInfoImpl.cpp
author Eitan Isaacson <eitan@monotonous.org>
Mon, 10 Dec 2018 03:30:21 +0000
changeset 449682 3386ff76878d83496bb822d09115c77472808b53
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1511955 - Don't traverse into children without hypertext interfaces. r=Jamie This prevents an infinite loop where we go into a child only to find the nearest hypertext accessible being its parent. Differential Revision: https://phabricator.services.mozilla.com/D13998

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 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 "nsMIMEInfoImpl.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsStringEnumerator.h"
#include "nsIFile.h"
#include "nsIFileURL.h"
#include "nsEscape.h"
#include "nsIURILoader.h"
#include "nsCURILoader.h"

// nsISupports methods
NS_IMPL_ADDREF(nsMIMEInfoBase)
NS_IMPL_RELEASE(nsMIMEInfoBase)

NS_INTERFACE_MAP_BEGIN(nsMIMEInfoBase)
  NS_INTERFACE_MAP_ENTRY(nsIHandlerInfo)
  // This is only an nsIMIMEInfo if it's a MIME handler.
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIMIMEInfo, mClass == eMIMEInfo)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIHandlerInfo)
NS_INTERFACE_MAP_END

// nsMIMEInfoImpl methods

// Constructors for a MIME handler.
nsMIMEInfoBase::nsMIMEInfoBase(const char* aMIMEType)
    : mSchemeOrType(aMIMEType),
      mClass(eMIMEInfo),
      mPreferredAction(nsIMIMEInfo::saveToDisk),
      mAlwaysAskBeforeHandling(true) {}

nsMIMEInfoBase::nsMIMEInfoBase(const nsACString& aMIMEType)
    : mSchemeOrType(aMIMEType),
      mClass(eMIMEInfo),
      mPreferredAction(nsIMIMEInfo::saveToDisk),
      mAlwaysAskBeforeHandling(true) {}

// Constructor for a handler that lets the caller specify whether this is a
// MIME handler or a protocol handler.  In the long run, these will be distinct
// classes (f.e. nsMIMEInfo and nsProtocolInfo), but for now we reuse this class
// for both and distinguish between the two kinds of handlers via the aClass
// argument to this method, which can be either eMIMEInfo or eProtocolInfo.
nsMIMEInfoBase::nsMIMEInfoBase(const nsACString& aType, HandlerClass aClass)
    : mSchemeOrType(aType),
      mClass(aClass),
      mPreferredAction(nsIMIMEInfo::saveToDisk),
      mAlwaysAskBeforeHandling(true) {}

nsMIMEInfoBase::~nsMIMEInfoBase() {}

NS_IMETHODIMP
nsMIMEInfoBase::GetFileExtensions(nsIUTF8StringEnumerator** aResult) {
  return NS_NewUTF8StringEnumerator(aResult, &mExtensions, this);
}

NS_IMETHODIMP
nsMIMEInfoBase::ExtensionExists(const nsACString& aExtension, bool* _retval) {
  NS_ASSERTION(!aExtension.IsEmpty(), "no extension");
  bool found = false;
  uint32_t extCount = mExtensions.Length();
  if (extCount < 1) return NS_OK;

  for (uint8_t i = 0; i < extCount; i++) {
    const nsCString& ext = mExtensions[i];
    if (ext.Equals(aExtension, nsCaseInsensitiveCStringComparator())) {
      found = true;
      break;
    }
  }

  *_retval = found;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetPrimaryExtension(nsACString& _retval) {
  if (!mExtensions.Length()) return NS_ERROR_NOT_INITIALIZED;

  _retval = mExtensions[0];
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetPrimaryExtension(const nsACString& aExtension) {
  NS_ASSERTION(!aExtension.IsEmpty(), "no extension");
  uint32_t extCount = mExtensions.Length();
  uint8_t i;
  bool found = false;
  for (i = 0; i < extCount; i++) {
    const nsCString& ext = mExtensions[i];
    if (ext.Equals(aExtension, nsCaseInsensitiveCStringComparator())) {
      found = true;
      break;
    }
  }
  if (found) {
    mExtensions.RemoveElementAt(i);
  }

  mExtensions.InsertElementAt(0, aExtension);

  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::AppendExtension(const nsACString& aExtension) {
  mExtensions.AppendElement(aExtension);
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetType(nsACString& aType) {
  if (mSchemeOrType.IsEmpty()) return NS_ERROR_NOT_INITIALIZED;

  aType = mSchemeOrType;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetMIMEType(nsACString& aMIMEType) {
  if (mSchemeOrType.IsEmpty()) return NS_ERROR_NOT_INITIALIZED;

  aMIMEType = mSchemeOrType;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetDescription(nsAString& aDescription) {
  aDescription = mDescription;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetDescription(const nsAString& aDescription) {
  mDescription = aDescription;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::Equals(nsIMIMEInfo* aMIMEInfo, bool* _retval) {
  if (!aMIMEInfo) return NS_ERROR_NULL_POINTER;

  nsAutoCString type;
  nsresult rv = aMIMEInfo->GetMIMEType(type);
  if (NS_FAILED(rv)) return rv;

  *_retval = mSchemeOrType.Equals(type);

  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetFileExtensions(const nsACString& aExtensions) {
  mExtensions.Clear();
  nsCString extList(aExtensions);

  int32_t breakLocation = -1;
  while ((breakLocation = extList.FindChar(',')) != -1) {
    mExtensions.AppendElement(
        Substring(extList.get(), extList.get() + breakLocation));
    extList.Cut(0, breakLocation + 1);
  }
  if (!extList.IsEmpty()) mExtensions.AppendElement(extList);
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetDefaultDescription(nsAString& aDefaultDescription) {
  aDefaultDescription = mDefaultAppDescription;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetPreferredApplicationHandler(
    nsIHandlerApp** aPreferredAppHandler) {
  *aPreferredAppHandler = mPreferredApplication;
  NS_IF_ADDREF(*aPreferredAppHandler);
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetPreferredApplicationHandler(
    nsIHandlerApp* aPreferredAppHandler) {
  mPreferredApplication = aPreferredAppHandler;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetPossibleApplicationHandlers(
    nsIMutableArray** aPossibleAppHandlers) {
  if (!mPossibleApplications)
    mPossibleApplications = do_CreateInstance(NS_ARRAY_CONTRACTID);

  if (!mPossibleApplications) return NS_ERROR_OUT_OF_MEMORY;

  *aPossibleAppHandlers = mPossibleApplications;
  NS_IF_ADDREF(*aPossibleAppHandlers);
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetPreferredAction(nsHandlerInfoAction* aPreferredAction) {
  *aPreferredAction = mPreferredAction;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetPreferredAction(nsHandlerInfoAction aPreferredAction) {
  mPreferredAction = aPreferredAction;
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetAlwaysAskBeforeHandling(bool* aAlwaysAsk) {
  *aAlwaysAsk = mAlwaysAskBeforeHandling;

  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetAlwaysAskBeforeHandling(bool aAlwaysAsk) {
  mAlwaysAskBeforeHandling = aAlwaysAsk;
  return NS_OK;
}

/* static */
nsresult nsMIMEInfoBase::GetLocalFileFromURI(nsIURI* aURI, nsIFile** aFile) {
  nsresult rv;

  nsCOMPtr<nsIFileURL> fileUrl = do_QueryInterface(aURI, &rv);
  if (NS_FAILED(rv)) {
    return rv;
  }

  nsCOMPtr<nsIFile> file;
  rv = fileUrl->GetFile(getter_AddRefs(file));
  if (NS_FAILED(rv)) {
    return rv;
  }

  file.forget(aFile);
  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::LaunchWithFile(nsIFile* aFile) {
  nsresult rv;

  // it doesn't make any sense to call this on protocol handlers
  NS_ASSERTION(mClass == eMIMEInfo,
               "nsMIMEInfoBase should have mClass == eMIMEInfo");

  if (mPreferredAction == useSystemDefault) {
    return LaunchDefaultWithFile(aFile);
  }

  if (mPreferredAction == useHelperApp) {
    if (!mPreferredApplication) return NS_ERROR_FILE_NOT_FOUND;

    // at the moment, we only know how to hand files off to local handlers
    nsCOMPtr<nsILocalHandlerApp> localHandler =
        do_QueryInterface(mPreferredApplication, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIFile> executable;
    rv = localHandler->GetExecutable(getter_AddRefs(executable));
    NS_ENSURE_SUCCESS(rv, rv);

    return LaunchWithIProcess(executable, aFile->NativePath());
  }

  return NS_ERROR_INVALID_ARG;
}

NS_IMETHODIMP
nsMIMEInfoBase::LaunchWithURI(nsIURI* aURI,
                              nsIInterfaceRequestor* aWindowContext) {
  // for now, this is only being called with protocol handlers; that
  // will change once we get to more general registerContentHandler
  // support
  NS_ASSERTION(mClass == eProtocolInfo,
               "nsMIMEInfoBase should be a protocol handler");

  if (mPreferredAction == useSystemDefault) {
    return LoadUriInternal(aURI);
  }

  if (mPreferredAction == useHelperApp) {
    if (!mPreferredApplication) return NS_ERROR_FILE_NOT_FOUND;

    return mPreferredApplication->LaunchWithURI(aURI, aWindowContext);
  }

  return NS_ERROR_INVALID_ARG;
}

void nsMIMEInfoBase::CopyBasicDataTo(nsMIMEInfoBase* aOther) {
  aOther->mSchemeOrType = mSchemeOrType;
  aOther->mDefaultAppDescription = mDefaultAppDescription;
  aOther->mExtensions = mExtensions;
}

/* static */
already_AddRefed<nsIProcess> nsMIMEInfoBase::InitProcess(nsIFile* aApp,
                                                         nsresult* aResult) {
  NS_ASSERTION(aApp, "Unexpected null pointer, fix caller");

  nsCOMPtr<nsIProcess> process =
      do_CreateInstance(NS_PROCESS_CONTRACTID, aResult);
  if (NS_FAILED(*aResult)) return nullptr;

  *aResult = process->Init(aApp);
  if (NS_FAILED(*aResult)) return nullptr;

  return process.forget();
}

/* static */
nsresult nsMIMEInfoBase::LaunchWithIProcess(nsIFile* aApp,
                                            const nsCString& aArg) {
  nsresult rv;
  nsCOMPtr<nsIProcess> process = InitProcess(aApp, &rv);
  if (NS_FAILED(rv)) return rv;

  const char* string = aArg.get();

  return process->Run(false, &string, 1);
}

/* static */
nsresult nsMIMEInfoBase::LaunchWithIProcess(nsIFile* aApp,
                                            const nsString& aArg) {
  nsresult rv;
  nsCOMPtr<nsIProcess> process = InitProcess(aApp, &rv);
  if (NS_FAILED(rv)) return rv;

  const char16_t* string = aArg.get();

  return process->Runw(false, &string, 1);
}

// nsMIMEInfoImpl implementation
NS_IMETHODIMP
nsMIMEInfoImpl::GetDefaultDescription(nsAString& aDefaultDescription) {
  if (mDefaultAppDescription.IsEmpty() && mDefaultApplication) {
    // Don't want to cache this, just in case someone resets the app
    // without changing the description....
    mDefaultApplication->GetLeafName(aDefaultDescription);
  } else {
    aDefaultDescription = mDefaultAppDescription;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoImpl::GetHasDefaultHandler(bool* _retval) {
  *_retval = !mDefaultAppDescription.IsEmpty();
  if (mDefaultApplication) {
    bool exists;
    *_retval = NS_SUCCEEDED(mDefaultApplication->Exists(&exists)) && exists;
  }
  return NS_OK;
}

nsresult nsMIMEInfoImpl::LaunchDefaultWithFile(nsIFile* aFile) {
  if (!mDefaultApplication) return NS_ERROR_FILE_NOT_FOUND;

  return LaunchWithIProcess(mDefaultApplication, aFile->NativePath());
}

NS_IMETHODIMP
nsMIMEInfoBase::GetPossibleLocalHandlers(nsIArray** _retval) {
  return NS_ERROR_NOT_IMPLEMENTED;
}