chrome/nsChromeProtocolHandler.cpp
author Mike Hommey <mh+mozilla@glandium.org>
Thu, 21 Jan 2016 17:08:53 +0900
changeset 318094 abd3c51d6eb1146dee3147845cfa65e954445eca
parent 303345 e8c7dfe727cd970e2c3294934e2927b14143c205
child 339542 82092aed0171cf6f9073d224c8b766b7bce41c4f
permissions -rw-r--r--
Bug 1241416 - Create a tier for things happening before export. r=gps While it would be possible to move those things in the export tier, it is still interesting to have reporting for them separately, especially considering I expect things to gradually move from the other tiers to this new one. While not entirely obvious, the recurse_pre-export target doesn't imply actual recursion as long as the RecursiveMake backend doesn't emit traversal information for it, so nothing will actually happen on this target, but the interesting part is that it runs, per the generic config/recurse.mk rules for tiers, between BUILDSTATUS TIER_START and BUILDSTATUS TIER_FINISH, so that all its dependencies are accounted as being part of the pre-export tier.

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set ts=4 sw=4 sts=4 et cin: */
/* 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/. */

/*

  A protocol handler for ``chrome:''

*/

#include "nsChromeProtocolHandler.h"
#include "nsChromeRegistry.h"
#include "nsCOMPtr.h"
#include "nsThreadUtils.h"
#include "nsIChannel.h"
#include "nsIChromeRegistry.h"
#include "nsIFile.h"
#include "nsIFileChannel.h"
#include "nsIIOService.h"
#include "nsILoadGroup.h"
#include "nsIScriptSecurityManager.h"
#include "nsIStandardURL.h"
#include "nsNetUtil.h"
#include "nsNetCID.h"
#include "nsIURL.h"
#include "nsString.h"
#include "nsStandardURL.h"

////////////////////////////////////////////////////////////////////////////////

NS_IMPL_ISUPPORTS(nsChromeProtocolHandler,
                  nsIProtocolHandler,
                  nsISupportsWeakReference)

////////////////////////////////////////////////////////////////////////////////
// nsIProtocolHandler methods:

NS_IMETHODIMP
nsChromeProtocolHandler::GetScheme(nsACString &result)
{
    result.AssignLiteral("chrome");
    return NS_OK;
}

NS_IMETHODIMP
nsChromeProtocolHandler::GetDefaultPort(int32_t *result)
{
    *result = -1;        // no port for chrome: URLs
    return NS_OK;
}

NS_IMETHODIMP
nsChromeProtocolHandler::AllowPort(int32_t port, const char *scheme, bool *_retval)
{
    // don't override anything.
    *_retval = false;
    return NS_OK;
}

NS_IMETHODIMP
nsChromeProtocolHandler::GetProtocolFlags(uint32_t *result)
{
    *result = URI_STD | URI_IS_UI_RESOURCE | URI_IS_LOCAL_RESOURCE;
    return NS_OK;
}

NS_IMETHODIMP
nsChromeProtocolHandler::NewURI(const nsACString &aSpec,
                                const char *aCharset,
                                nsIURI *aBaseURI,
                                nsIURI **result)
{

    // Chrome: URLs (currently) have no additional structure beyond that provided
    // by standard URLs, so there is no "outer" given to CreateInstance

    RefPtr<nsStandardURL> surl = new nsStandardURL();

    nsresult rv = surl->Init(nsIStandardURL::URLTYPE_STANDARD, -1, aSpec,
                             aCharset, aBaseURI);
    if (NS_FAILED(rv))
        return rv;

    // Canonify the "chrome:" URL; e.g., so that we collapse
    // "chrome://navigator/content/" and "chrome://navigator/content"
    // and "chrome://navigator/content/navigator.xul".

    rv = nsChromeRegistry::Canonify(surl);
    if (NS_FAILED(rv))
        return rv;

    surl->SetMutable(false);

    surl.forget(result);
    return NS_OK;
}

NS_IMETHODIMP
nsChromeProtocolHandler::NewChannel2(nsIURI* aURI,
                                     nsILoadInfo* aLoadInfo,
                                     nsIChannel** aResult)
{
    nsresult rv;

    NS_ENSURE_ARG_POINTER(aURI);
    NS_PRECONDITION(aResult, "Null out param");

#ifdef DEBUG
    // Check that the uri we got is already canonified
    nsresult debug_rv;
    nsCOMPtr<nsIURI> debugClone;
    debug_rv = aURI->Clone(getter_AddRefs(debugClone));
    if (NS_SUCCEEDED(debug_rv)) {
        nsCOMPtr<nsIURL> debugURL (do_QueryInterface(debugClone));
        debug_rv = nsChromeRegistry::Canonify(debugURL);
        if (NS_SUCCEEDED(debug_rv)) {
            bool same;
            debug_rv = aURI->Equals(debugURL, &same);
            if (NS_SUCCEEDED(debug_rv)) {
                NS_ASSERTION(same, "Non-canonified chrome uri passed to nsChromeProtocolHandler::NewChannel!");
            }
        }
    }
#endif

    nsCOMPtr<nsIChannel> result;

    if (!nsChromeRegistry::gChromeRegistry) {
        // We don't actually want this ref, we just want the service to
        // initialize if it hasn't already.
        nsCOMPtr<nsIChromeRegistry> reg =
            mozilla::services::GetChromeRegistryService();
        NS_ENSURE_TRUE(nsChromeRegistry::gChromeRegistry, NS_ERROR_FAILURE);
    }

    nsCOMPtr<nsIURI> resolvedURI;
    rv = nsChromeRegistry::gChromeRegistry->ConvertChromeURL(aURI, getter_AddRefs(resolvedURI));
    if (NS_FAILED(rv)) {
#ifdef DEBUG
        nsAutoCString spec;
        aURI->GetSpec(spec);
        printf("Couldn't convert chrome URL: %s\n", spec.get());
#endif
        return rv;
    }

    rv = NS_NewChannelInternal(getter_AddRefs(result),
                               resolvedURI,
                               aLoadInfo);
    NS_ENSURE_SUCCESS(rv, rv);

#ifdef DEBUG
    nsCOMPtr<nsIFileChannel> fileChan(do_QueryInterface(result));
    if (fileChan) {
        nsCOMPtr<nsIFile> file;
        fileChan->GetFile(getter_AddRefs(file));

        bool exists = false;
        file->Exists(&exists);
        if (!exists) {
            nsAutoCString path;
            file->GetNativePath(path);
            printf("Chrome file doesn't exist: %s\n", path.get());
        }
    }
#endif

    // Make sure that the channel remembers where it was
    // originally loaded from.
    nsLoadFlags loadFlags = 0;
    result->GetLoadFlags(&loadFlags);
    result->SetLoadFlags(loadFlags & ~nsIChannel::LOAD_REPLACE);
    rv = result->SetOriginalURI(aURI);
    if (NS_FAILED(rv)) return rv;

    // Get a system principal for content files and set the owner
    // property of the result
    nsCOMPtr<nsIURL> url = do_QueryInterface(aURI);
    nsAutoCString path;
    rv = url->GetPath(path);
    if (StringBeginsWith(path, NS_LITERAL_CSTRING("/content/")))
    {
        nsCOMPtr<nsIScriptSecurityManager> securityManager =
                 do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
        if (NS_FAILED(rv)) return rv;

        nsCOMPtr<nsIPrincipal> principal;
        rv = securityManager->GetSystemPrincipal(getter_AddRefs(principal));
        if (NS_FAILED(rv)) return rv;

        nsCOMPtr<nsISupports> owner = do_QueryInterface(principal);
        result->SetOwner(owner);
    }

    // XXX Removed dependency-tracking code from here, because we're not
    // tracking them anyways (with fastload we checked only in DEBUG
    // and with startupcache not at all), but this is where we would start
    // if we need to re-add.
    // See bug 531886, bug 533038.
    result->SetContentCharset(NS_LITERAL_CSTRING("UTF-8"));

    *aResult = result;
    NS_ADDREF(*aResult);
    return NS_OK;
}

NS_IMETHODIMP
nsChromeProtocolHandler::NewChannel(nsIURI* aURI,
                                    nsIChannel* *aResult)
{
  return NewChannel2(aURI, nullptr, aResult);
}

////////////////////////////////////////////////////////////////////////////////