gecko-dev/uriloader/exthandler/nsMIMEInfoImpl.cpp

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#include "nsMIMEInfoImpl.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsStringEnumerator.h"
#include "nsIProcess.h"
#include "nsILocalFile.h"
#include "nsIFileURL.h"

// nsISupports methods
NS_IMPL_THREADSAFE_ADDREF(nsMIMEInfoBase)
NS_IMPL_THREADSAFE_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_THREADSAFE

// nsMIMEInfoImpl methods

// Constructors for a MIME handler.
nsMIMEInfoBase::nsMIMEInfoBase(const char *aMIMEType) :
    mMacType(0),
    mMacCreator(0),
    mType(aMIMEType),
    mClass(eMIMEInfo),
    mPreferredAction(nsIMIMEInfo::saveToDisk),
    mAlwaysAskBeforeHandling(PR_TRUE)
{
}

nsMIMEInfoBase::nsMIMEInfoBase(const nsACString& aMIMEType) :
    mMacType(0),
    mMacCreator(0),
    mType(aMIMEType),
    mClass(eMIMEInfo),
    mPreferredAction(nsIMIMEInfo::saveToDisk),
    mAlwaysAskBeforeHandling(PR_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) :
    mMacType(0),
    mMacCreator(0),
    mType(aType),
    mClass(aClass),
    mPreferredAction(nsIMIMEInfo::saveToDisk),
    mAlwaysAskBeforeHandling(PR_TRUE)
{
}

nsMIMEInfoBase::~nsMIMEInfoBase()
{
}

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

NS_IMETHODIMP
nsMIMEInfoBase::ExtensionExists(const nsACString& aExtension, PRBool *_retval)
{
    NS_ASSERTION(!aExtension.IsEmpty(), "no extension");
    PRBool found = PR_FALSE;
    PRUint32 extCount = mExtensions.Count();
    if (extCount < 1) return NS_OK;

    for (PRUint8 i=0; i < extCount; i++) {
        nsCString* ext = (nsCString*)mExtensions.CStringAt(i);
        if (ext->Equals(aExtension, nsCaseInsensitiveCStringComparator())) {
            found = PR_TRUE;
            break;
        }
    }

    *_retval = found;
    return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetPrimaryExtension(nsACString& _retval)
{
    PRUint32 extCount = mExtensions.Count();
    if (extCount < 1) return NS_ERROR_NOT_INITIALIZED;

    _retval = *(mExtensions.CStringAt(0));
    return NS_OK;    
}

NS_IMETHODIMP
nsMIMEInfoBase::SetPrimaryExtension(const nsACString& aExtension)
{
  NS_ASSERTION(!aExtension.IsEmpty(), "no extension");
  PRUint32 extCount = mExtensions.Count();
  PRUint8 i;
  PRBool found = PR_FALSE;
  for (i=0; i < extCount; i++) {
    nsCString* ext = (nsCString*)mExtensions.CStringAt(i);
    if (ext->Equals(aExtension, nsCaseInsensitiveCStringComparator())) {
      found = PR_TRUE;
      break;
    }
  }
  if (found) {
    mExtensions.RemoveCStringAt(i);
  }

  mExtensions.InsertCStringAt(aExtension, 0);
  
  return NS_OK;
}

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

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

    aType = mType;
    return NS_OK;
}

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

    aMIMEType = mType;
    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, PRBool *_retval)
{
    if (!aMIMEInfo) return NS_ERROR_NULL_POINTER;

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

    *_retval = mType.Equals(type);

    return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetMacType(PRUint32 *aMacType)
{
    *aMacType = mMacType;

    if (!mMacType)
        return NS_ERROR_NOT_INITIALIZED;

    return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetMacType(PRUint32 aMacType)
{
    mMacType = aMacType;
    return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::GetMacCreator(PRUint32 *aMacCreator)
{
    *aMacCreator = mMacCreator;

    if (!mMacCreator)
        return NS_ERROR_NOT_INITIALIZED;

    return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetMacCreator(PRUint32 aMacCreator)
{
    mMacCreator = aMacCreator;
    return NS_OK;
}

NS_IMETHODIMP
nsMIMEInfoBase::SetFileExtensions(const nsACString& aExtensions)
{
    mExtensions.Clear();
    nsCString extList( aExtensions );
    
    PRInt32 breakLocation = -1;
    while ( (breakLocation= extList.FindChar(',') )!= -1)
    {
        mExtensions.AppendCString(Substring(extList.get(), extList.get() + breakLocation));
        extList.Cut(0, breakLocation+1 );
    }
    if ( !extList.IsEmpty() )
        mExtensions.AppendCString( 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(PRBool * aAlwaysAsk)
{
  *aAlwaysAsk = mAlwaysAskBeforeHandling;

  return NS_OK;
}

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

/* static */
nsresult 
nsMIMEInfoBase::GetLocalFileFromURI(nsIURI *aURI, nsILocalFile **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;    

  return CallQueryInterface(file, aFile);
}


NS_IMETHODIMP
nsMIMEInfoBase::LaunchWithURI(nsIURI* aURI)
{
  nsCOMPtr<nsILocalFile> docToLoad;
  nsresult rv;
  
  if (mPreferredAction == useHelperApp) {
    if (!mPreferredApplication)
      return NS_ERROR_FILE_NOT_FOUND;

    // check for and possibly launch with web application
    nsCOMPtr<nsIWebHandlerApp> webHandler = 
      do_QueryInterface(mPreferredApplication, &rv);
    if (NS_SUCCEEDED(rv)) {
      return LaunchWithWebHandler(webHandler, aURI);         
    }

    // ok, we must have a local handler app
    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);

    // get the nsILocalFile version of the doc to launch with
    rv = GetLocalFileFromURI(aURI, getter_AddRefs(docToLoad));
    if (NS_FAILED(rv)) {

      // If we don't have a file, we must be a protocol handler        
      NS_ASSERTION(mClass == eProtocolInfo,
                   "nsMIMEInfoBase should be a protocol handler");

      // so pass the entire URI to the handler.
      nsCAutoString spec;
      aURI->GetSpec(spec);
      return LaunchWithIProcess(executable, spec);
    }

    // note that the file pointed to by docToLoad could possibly have
    // originated as a file: URI if we're in some non-browser application.

    nsCAutoString path;
    docToLoad->GetNativePath(path);
    return LaunchWithIProcess(executable, path);
  }
  else if (mPreferredAction == useSystemDefault) {
    if (mClass == eProtocolInfo)
      return LoadUriInternal(aURI);

    rv = GetLocalFileFromURI(aURI, getter_AddRefs(docToLoad));
    NS_ENSURE_SUCCESS(rv, rv);

    return LaunchDefaultWithFile(docToLoad);
  }

  return NS_ERROR_INVALID_ARG;
}

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

  aOther->mMacType = mMacType;
  aOther->mMacCreator = mMacCreator;
}

/* static */
nsresult
nsMIMEInfoBase::LaunchWithIProcess(nsIFile* aApp, const nsCString& aArg)
{
  NS_ASSERTION(aApp, "Unexpected null pointer, fix caller");

  nsresult rv;
  nsCOMPtr<nsIProcess> process = do_CreateInstance(NS_PROCESS_CONTRACTID, &rv);
  if (NS_FAILED(rv))
    return rv;

  if (NS_FAILED(rv = process->Init(aApp)))
    return rv;

  const char *string = aArg.get();

  PRUint32 pid;
  return process->Run(PR_FALSE, &string, 1, &pid);
}

/* static */
nsresult
nsMIMEInfoBase::LaunchWithWebHandler(nsIWebHandlerApp *aApp, nsIURI *aURI) 
{
  // we'll be implementing this Real Soon Now!
  return NS_ERROR_NOT_IMPLEMENTED;
}

// 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(PRBool * _retval)
{
  *_retval = !mDefaultAppDescription.IsEmpty();
  if (mDefaultApplication) {
    PRBool exists;
    *_retval = NS_SUCCEEDED(mDefaultApplication->Exists(&exists)) && exists;
  }
  return NS_OK;
}

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

  nsCAutoString nativePath;
  aFile->GetNativePath(nativePath);
  
  return LaunchWithIProcess(mDefaultApplication, nativePath);
}