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mozJSSubScriptLoader.cpp
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mozJSSubScriptLoader.cpp
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=80:
*
* 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 "mozJSSubScriptLoader.h"
#include "mozJSComponentLoader.h"
#include "mozJSLoaderUtils.h"
#include "nsIURI.h"
#include "nsIIOService.h"
#include "nsIChannel.h"
#include "nsIInputStream.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsIFileURL.h"
#include "nsScriptLoader.h"
#include "nsIScriptSecurityManager.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "js/OldDebugAPI.h"
#include "nsJSPrincipals.h"
#include "xpcpublic.h" // For xpc::SystemErrorReporter
#include "mozilla/scache/StartupCache.h"
#include "mozilla/scache/StartupCacheUtils.h"
using namespace mozilla::scache;
using namespace JS;
/* load() error msgs, XXX localize? */
#define LOAD_ERROR_NOSERVICE "Error creating IO Service."
#define LOAD_ERROR_NOURI "Error creating URI (invalid URL scheme?)"
#define LOAD_ERROR_NOSCHEME "Failed to get URI scheme. This is bad."
#define LOAD_ERROR_URI_NOT_LOCAL "Trying to load a non-local URI."
#define LOAD_ERROR_NOSTREAM "Error opening input stream (invalid filename?)"
#define LOAD_ERROR_NOCONTENT "ContentLength not available (not a local URL?)"
#define LOAD_ERROR_BADCHARSET "Error converting to specified charset"
#define LOAD_ERROR_BADREAD "File Read Error."
#define LOAD_ERROR_READUNDERFLOW "File Read Error (underflow.)"
#define LOAD_ERROR_NOPRINCIPALS "Failed to get principals."
#define LOAD_ERROR_NOSPEC "Failed to get URI spec. This is bad."
#define LOAD_ERROR_CONTENTTOOBIG "ContentLength is too large"
mozJSSubScriptLoader::mozJSSubScriptLoader() : mSystemPrincipal(nullptr)
{
// Force construction of the JS component loader. We may need it later.
nsCOMPtr<xpcIJSModuleLoader> componentLoader =
do_GetService(MOZJSCOMPONENTLOADER_CONTRACTID);
}
mozJSSubScriptLoader::~mozJSSubScriptLoader()
{
/* empty */
}
NS_IMPL_ISUPPORTS1(mozJSSubScriptLoader, mozIJSSubScriptLoader)
static nsresult
ReportError(JSContext *cx, const char *msg)
{
JS_SetPendingException(cx, STRING_TO_JSVAL(JS_NewStringCopyZ(cx, msg)));
return NS_OK;
}
nsresult
mozJSSubScriptLoader::ReadScript(nsIURI *uri, JSContext *cx, JSObject *targetObjArg,
const nsAString& charset, const char *uriStr,
nsIIOService *serv, nsIPrincipal *principal,
bool reuseGlobal, JSScript **scriptp,
JSFunction **functionp)
{
RootedObject target_obj(cx, targetObjArg);
nsCOMPtr<nsIChannel> chan;
nsCOMPtr<nsIInputStream> instream;
JSErrorReporter er;
*scriptp = nullptr;
*functionp = nullptr;
nsresult rv;
// Instead of calling NS_OpenURI, we create the channel ourselves and call
// SetContentType, to avoid expensive MIME type lookups (bug 632490).
rv = NS_NewChannel(getter_AddRefs(chan), uri, serv,
nullptr, nullptr, nsIRequest::LOAD_NORMAL);
if (NS_SUCCEEDED(rv)) {
chan->SetContentType(NS_LITERAL_CSTRING("application/javascript"));
rv = chan->Open(getter_AddRefs(instream));
}
if (NS_FAILED(rv)) {
return ReportError(cx, LOAD_ERROR_NOSTREAM);
}
int64_t len = -1;
rv = chan->GetContentLength(&len);
if (NS_FAILED(rv) || len == -1) {
return ReportError(cx, LOAD_ERROR_NOCONTENT);
}
if (len > INT32_MAX) {
return ReportError(cx, LOAD_ERROR_CONTENTTOOBIG);
}
nsCString buf;
rv = NS_ReadInputStreamToString(instream, buf, len);
if (NS_FAILED(rv))
return rv;
/* set our own error reporter so we can report any bad things as catchable
* exceptions, including the source/line number */
er = JS_SetErrorReporter(cx, xpc::SystemErrorReporter);
JS::CompileOptions options(cx);
options.setPrincipals(nsJSPrincipals::get(principal))
.setFileAndLine(uriStr, 1);
if (!charset.IsVoid()) {
nsString script;
rv = nsScriptLoader::ConvertToUTF16(nullptr, reinterpret_cast<const uint8_t*>(buf.get()), len,
charset, nullptr, script);
if (NS_FAILED(rv)) {
return ReportError(cx, LOAD_ERROR_BADCHARSET);
}
if (!reuseGlobal) {
*scriptp = JS::Compile(cx, target_obj, options,
reinterpret_cast<const jschar*>(script.get()),
script.Length());
} else {
*functionp = JS::CompileFunction(cx, target_obj, options,
nullptr, 0, nullptr,
reinterpret_cast<const jschar*>(script.get()),
script.Length());
}
} else {
// We only use LAZY_SOURCE when no special encoding is specified because
// the lazy source loader doesn't know the encoding.
if (!reuseGlobal) {
options.setSourcePolicy(JS::CompileOptions::LAZY_SOURCE);
*scriptp = JS::Compile(cx, target_obj, options, buf.get(), len);
} else {
*functionp = JS::CompileFunction(cx, target_obj, options,
nullptr, 0, nullptr, buf.get(),
len);
}
}
/* repent for our evil deeds */
JS_SetErrorReporter(cx, er);
return NS_OK;
}
NS_IMETHODIMP
mozJSSubScriptLoader::LoadSubScript(const nsAString& url,
const JS::Value& target,
const nsAString& charset,
JSContext* cx,
JS::Value* retval)
{
/*
* Loads a local url and evals it into the current cx
* Synchronous (an async version would be cool too.)
* url: The url to load. Must be local so that it can be loaded
* synchronously.
* target_obj: Optional object to eval the script onto (defaults to context
* global)
* returns: Whatever jsval the script pointed to by the url returns.
* Should ONLY (O N L Y !) be called from JavaScript code.
*/
nsresult rv = NS_OK;
/* set the system principal if it's not here already */
if (!mSystemPrincipal) {
nsCOMPtr<nsIScriptSecurityManager> secman =
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID);
if (!secman)
return NS_OK;
rv = secman->GetSystemPrincipal(getter_AddRefs(mSystemPrincipal));
if (NS_FAILED(rv) || !mSystemPrincipal)
return rv;
}
RootedObject targetObj(cx);
mozJSComponentLoader* loader = mozJSComponentLoader::Get();
rv = loader->FindTargetObject(cx, &targetObj);
NS_ENSURE_SUCCESS(rv, rv);
bool reusingGlobal = !JS_IsGlobalObject(targetObj);
// We base reusingGlobal off of what the loader told us, but we may not
// actually be using that object.
RootedObject passedObj(cx);
if (!JS_ValueToObject(cx, target, passedObj.address()))
return NS_ERROR_ILLEGAL_VALUE;
if (passedObj)
targetObj = passedObj;
// Remember an object out of the calling compartment so that we
// can properly wrap the result later.
nsCOMPtr<nsIPrincipal> principal = mSystemPrincipal;
RootedObject result_obj(cx, targetObj);
targetObj = JS_FindCompilationScope(cx, targetObj);
if (!targetObj)
return NS_ERROR_FAILURE;
if (targetObj != result_obj) {
nsCOMPtr<nsIScriptSecurityManager> secman =
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID);
if (!secman)
return NS_ERROR_FAILURE;
rv = secman->GetObjectPrincipal(cx, targetObj, getter_AddRefs(principal));
NS_ENSURE_SUCCESS(rv, rv);
}
JSAutoCompartment ac(cx, targetObj);
/* load up the url. From here on, failures are reflected as ``custom''
* js exceptions */
nsCOMPtr<nsIURI> uri;
nsAutoCString uriStr;
nsAutoCString scheme;
RootedScript script(cx);
// Figure out who's calling us
if (!JS_DescribeScriptedCaller(cx, script.address(), nullptr)) {
// No scripted frame means we don't know who's calling, bail.
return NS_ERROR_FAILURE;
}
// Suppress caching if we're compiling as content.
StartupCache* cache = (principal == mSystemPrincipal)
? StartupCache::GetSingleton()
: nullptr;
nsCOMPtr<nsIIOService> serv = do_GetService(NS_IOSERVICE_CONTRACTID);
if (!serv) {
return ReportError(cx, LOAD_ERROR_NOSERVICE);
}
// Make sure to explicitly create the URI, since we'll need the
// canonicalized spec.
rv = NS_NewURI(getter_AddRefs(uri), NS_LossyConvertUTF16toASCII(url).get(), nullptr, serv);
if (NS_FAILED(rv)) {
return ReportError(cx, LOAD_ERROR_NOURI);
}
rv = uri->GetSpec(uriStr);
if (NS_FAILED(rv)) {
return ReportError(cx, LOAD_ERROR_NOSPEC);
}
rv = uri->GetScheme(scheme);
if (NS_FAILED(rv)) {
return ReportError(cx, LOAD_ERROR_NOSCHEME);
}
if (!scheme.EqualsLiteral("chrome")) {
// This might be a URI to a local file, though!
nsCOMPtr<nsIURI> innerURI = NS_GetInnermostURI(uri);
nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(innerURI);
if (!fileURL) {
return ReportError(cx, LOAD_ERROR_URI_NOT_LOCAL);
}
// For file URIs prepend the filename with the filename of the
// calling script, and " -> ". See bug 418356.
nsAutoCString tmp(JS_GetScriptFilename(cx, script));
tmp.AppendLiteral(" -> ");
tmp.Append(uriStr);
uriStr = tmp;
}
bool writeScript = false;
JSVersion version = JS_GetVersion(cx);
nsAutoCString cachePath;
cachePath.AppendPrintf("jssubloader/%d", version);
PathifyURI(uri, cachePath);
RootedFunction function(cx);
script = nullptr;
if (cache)
rv = ReadCachedScript(cache, cachePath, cx, mSystemPrincipal, script.address());
if (!script) {
rv = ReadScript(uri, cx, targetObj, charset,
static_cast<const char*>(uriStr.get()), serv,
principal, reusingGlobal, script.address(), function.address());
writeScript = !!script;
}
if (NS_FAILED(rv) || (!script && !function))
return rv;
if (function) {
script = JS_GetFunctionScript(cx, function);
}
loader->NoteSubScript(script, targetObj);
bool ok = false;
if (function) {
ok = JS_CallFunction(cx, targetObj, function, 0, nullptr, retval);
} else {
ok = JS_ExecuteScriptVersion(cx, targetObj, script, retval, version);
}
if (ok) {
JSAutoCompartment rac(cx, result_obj);
if (!JS_WrapValue(cx, retval))
return NS_ERROR_UNEXPECTED;
}
if (cache && ok && writeScript) {
WriteCachedScript(cache, cachePath, cx, mSystemPrincipal, script);
}
return NS_OK;
}