nscliveconnect.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
/*
 * This file is part of the Java-vendor-neutral implementation of LiveConnect
 *
 * It contains the implementation providing nsIFactory XP-COM interface.
 *
 */


#include <stdlib.h>
#include <string.h>
#include "prtypes.h"
#include "prprf.h"
#include "prlog.h"

#include "jsj_private.h"
#include "jsjava.h"

#include "jscntxt.h"        /* For js_ReportErrorAgain().*/

#include "netscape_javascript_JSObject.h"   /* javah-generated headers */
#include "nsISecurityContext.h"
#include "nsIServiceManager.h"
#include "nsIJSContextStack.h"

PR_BEGIN_EXTERN_C

/* A captured JavaScript error, created when JS_ReportError() is called while
   running JavaScript code that is itself called from Java. */
struct CapturedJSError {
    char *              message;
    JSErrorReport       report;         /* Line # of error, etc. */
    jthrowable          java_exception; /* Java exception, error, or null */
    CapturedJSError *   next;                   /* Next oldest captured JS error */
};
PR_END_EXTERN_C

#include "nsCLiveconnect.h"

#include "jsinterp.h"  // XXX private API so we can auto-push a JSStackFrame
#include "nsIScriptSecurityManager.h"
#include "nsIPrincipal.h"
#include "nsNetUtil.h"
#include "nsISecurityContext.h"
#include "prmem.h"

static nsresult
CreatePrincipal(nsISupports* aSecuritySupports,
                nsIScriptSecurityManager* aSecMan,
                nsIPrincipal ** aOutPrincipal)
{
    nsresult rv;
    nsCOMPtr<nsISecurityContext> securityContext(
        do_QueryInterface(aSecuritySupports, &rv));
    if (NS_FAILED(rv)) return rv;

    char originBuf1[512];
    char* origin = originBuf1;
    size_t originSize = sizeof(originBuf1);
    rv = securityContext->GetOrigin(origin, originSize);
    while (NS_FAILED(rv) && originSize < 65536U)
    {  // Try allocating a larger buffer on the heap
        if (origin != originBuf1)
        PR_Free(origin);
        originSize *= 2;
        origin = (char*)PR_Malloc(originSize);
        if (!origin)
            return NS_ERROR_OUT_OF_MEMORY;
        rv = securityContext->GetOrigin(origin, originSize);
    }
    if (NS_FAILED(rv))
    {
        if (origin != originBuf1)
            PR_Free(origin);
        return rv;
    }

    nsCOMPtr<nsIURI> originURI;
    rv = NS_NewURI(getter_AddRefs(originURI), origin);
    if (origin != originBuf1)
        PR_Free(origin);
    if (NS_FAILED(rv)) return rv;

    return aSecMan->GetCodebasePrincipal(originURI, aOutPrincipal);
}

/***************************************************************************/
// A class to put on the stack to manage JS contexts when we are entering JS.
// This pushes and pops the given context
// with the nsThreadJSContextStack service as this object goes into and out
// of scope. It is optimized to not push/pop the cx if it is already on top
// of the stack. We need to push the JSContext when we enter JS because the
// JS security manager looks on the context stack for permissions information.

class AutoPushJSContext
{
public:
    AutoPushJSContext(nsISupports* aSecuritySupports,
                      JSContext *cx);

    ~AutoPushJSContext();

    nsresult ResultOfPush() { return mPushResult; };

private:
    nsCOMPtr<nsIJSContextStack> mContextStack;
    JSContext*                  mContext;
    JSStackFrame                mFrame;
    nsresult                    mPushResult;
};

AutoPushJSContext::AutoPushJSContext(nsISupports* aSecuritySupports,
                                     JSContext *cx) 
                                     : mContext(cx), mPushResult(NS_OK)
{
    mContextStack = do_GetService("@mozilla.org/js/xpc/ContextStack;1");

    if(mContextStack)
    {
        JSContext* currentCX;
        if(NS_SUCCEEDED(mContextStack->Peek(&currentCX)))
        {
            // Is the current context already on the stack?
            if(cx == currentCX)
                mContextStack = nsnull;
            else
            {
                mContextStack->Push(cx);
                // Leave the reference to the mContextStack to
                // indicate that we need to pop it in our dtor.                                               
            }
        }
    }

    nsCOMPtr<nsIScriptSecurityManager> secMan(
        do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &mPushResult));

    if (NS_FAILED(mPushResult))
        return;

    nsCOMPtr<nsIPrincipal> principal;
    if (aSecuritySupports)
        mPushResult = CreatePrincipal(aSecuritySupports, secMan, getter_AddRefs(principal));
    else
        mPushResult = secMan->GetPrincipalFromContext(cx, getter_AddRefs(principal));

    if (NS_FAILED(mPushResult))
    {
        JS_ReportError(cx, "failed to get a principal");
        return;
    }

    // See if Javascript is enabled for the current window
    PRBool jsEnabled = PR_FALSE;
    mPushResult = secMan->CanExecuteScripts(cx, principal, &jsEnabled);
    if (!jsEnabled)
        mPushResult = NS_ERROR_FAILURE;

    memset(&mFrame, 0, sizeof(mFrame));

    if (NS_SUCCEEDED(mPushResult))
    {
        // See if there are any scripts on the stack.
        // If not, we need to add a dummy frame with a principal.

        PRBool hasScript = PR_FALSE;
        JSStackFrame* tempFP = cx->fp;
        while (tempFP)
        {
            if (tempFP->script)
            {
                hasScript = PR_TRUE;
                break;
            }
            tempFP = tempFP->down;
        };

        if (!hasScript)
        {
            JSPrincipals* jsprinc;
            principal->GetJSPrincipals(cx, &jsprinc);

            mFrame.script = JS_CompileScriptForPrincipals(cx, JS_GetGlobalObject(cx),
                                                          jsprinc, "", 0, "", 1);
            JSPRINCIPALS_DROP(cx, jsprinc);

            if (mFrame.script)
            {
                mFrame.down = cx->fp;
                cx->fp = &mFrame;
            }
            else
                mPushResult = NS_ERROR_OUT_OF_MEMORY;
        }
    }
}

AutoPushJSContext::~AutoPushJSContext()
{
    if (mContextStack)
        mContextStack->Pop(nsnull);

    if (mFrame.script)
        mContext->fp = mFrame.down;

}


////////////////////////////////////////////////////////////////////////////
// from nsISupports and AggregatedQueryInterface:

// Thes macro expands to the aggregated query interface scheme.

NS_IMPL_AGGREGATED(nsCLiveconnect)

NS_METHOD
nsCLiveconnect::AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr)
{
	 NS_ENSURE_ARG_POINTER(aInstancePtr);

    if (aIID.Equals(NS_GET_IID(nsISupports))) {
      *aInstancePtr = GetInner();
    }
    else if (aIID.Equals(NS_GET_IID(nsILiveconnect))) {
        *aInstancePtr = NS_STATIC_CAST(nsILiveconnect*, this);
    }
	 else	{
		  *aInstancePtr = nsnull;
		  return NS_NOINTERFACE;
	 }
	 NS_ADDREF((nsISupports*) *aInstancePtr);
	 return NS_OK;
}



////////////////////////////////////////////////////////////////////////////
// from nsILiveconnect:

/**
 * get member of a Native JSObject for a given name.
 *
 * @param jEnv       - JNIEnv on which the call is being made.
 * @param obj        - A Native JS Object.
 * @param name       - Name of a member.
 * @param pjobj      - return parameter as a java object representing 
 *                     the member. If it is a basic data type it is converted to
 *                     a corresponding java type. If it is a NJSObject, then it is
 *                     wrapped up as java wrapper netscape.javascript.JSObject.
 */
NS_METHOD	
nsCLiveconnect::GetMember(JNIEnv *jEnv, jsobject obj, const jchar *name, jsize length, void* principalsArray[], 
                     int numPrincipals, nsISupports *securitySupports, jobject *pjobj)
{
    if(jEnv == NULL || obj == 0)
    {
       return NS_ERROR_FAILURE;
    }

    JSJavaThreadState *jsj_env        = NULL;
    JSObjectHandle    *handle         = (JSObjectHandle*)obj;
    JSObject          *js_obj         = handle->js_obj;
    JSContext         *cx             = NULL;
    jobject            member         = NULL;
    jsval              js_val;
    int                dummy_cost     = 0;
    JSBool             dummy_bool     = PR_FALSE;
    JSErrorReporter    saved_state    = NULL;

    jsj_env = jsj_enter_js(jEnv, mJavaClient, NULL, &cx, NULL, &saved_state, principalsArray, numPrincipals, securitySupports);
    if (!jsj_env)
        return NS_ERROR_FAILURE;

    AutoPushJSContext autopush(securitySupports, cx);
    if (NS_FAILED(autopush.ResultOfPush()))
        goto done;

    if (!name) {
        JS_ReportError(cx, "illegal null member name");
        member = NULL;
        goto done;
    }
    
    if (!JS_GetUCProperty(cx, js_obj, name, length, &js_val))
        goto done;

    jsj_ConvertJSValueToJavaObject(cx, jEnv, js_val, jsj_get_jlObject_descriptor(cx, jEnv),
                                   &dummy_cost, &member, &dummy_bool);

done:
    if (!jsj_exit_js(cx, jsj_env, saved_state))
        return NS_ERROR_FAILURE;
    
    *pjobj = member;

    return NS_OK;
}


/**
 * get member of a Native JSObject for a given index.
 *
 * @param jEnv       - JNIEnv on which the call is being made.
 * @param obj        - A Native JS Object.
 * @param index      - Index of a member.
 * @param pjobj      - return parameter as a java object representing 
 *                     the member. 
 */
NS_METHOD	
nsCLiveconnect::GetSlot(JNIEnv *jEnv, jsobject obj, jint slot, void* principalsArray[], 
                     int numPrincipals, nsISupports *securitySupports,  jobject *pjobj)
{
    if(jEnv == NULL || obj == 0)
    {
       return NS_ERROR_FAILURE;
    }

    JSJavaThreadState *jsj_env        = NULL;
    JSObjectHandle    *handle         = (JSObjectHandle*)obj;
    JSObject          *js_obj         = handle->js_obj;
    JSContext         *cx             = NULL;
    jobject            member         = NULL;
    jsval              js_val;
    int                dummy_cost     = 0;
    JSBool             dummy_bool     = PR_FALSE;
    JSErrorReporter    saved_state    = NULL;

    jsj_env = jsj_enter_js(jEnv, mJavaClient, NULL, &cx, NULL, &saved_state, principalsArray, numPrincipals, securitySupports);
    if (!jsj_env)
       return NS_ERROR_FAILURE;

    AutoPushJSContext autopush(securitySupports, cx);
    if (NS_FAILED(autopush.ResultOfPush()))
        goto done;
    
    // =-= sudu: check to see if slot can be passed in as is.
    //           Should it be converted to a jsint?
    if (!JS_GetElement(cx, js_obj, slot, &js_val))
        goto done;
    if (!jsj_ConvertJSValueToJavaObject(cx, jEnv, js_val, jsj_get_jlObject_descriptor(cx, jEnv),
                                        &dummy_cost, &member, &dummy_bool))
        goto done;

done:
    if (!jsj_exit_js(cx, jsj_env, saved_state))
       return NS_ERROR_FAILURE;
    
    *pjobj = member;
    return NS_OK;
}

/**
 * set member of a Native JSObject for a given name.
 *
 * @param jEnv       - JNIEnv on which the call is being made.
 * @param obj        - A Native JS Object.
 * @param name       - Name of a member.
 * @param jobj       - Value to set. If this is a basic data type, it is converted
 *                     using standard JNI calls but if it is a wrapper to a JSObject
 *                     then a internal mapping is consulted to convert to a NJSObject.
 */
NS_METHOD	
nsCLiveconnect::SetMember(JNIEnv *jEnv, jsobject obj, const jchar *name, jsize length, jobject java_obj, void* principalsArray[], 
                     int numPrincipals, nsISupports *securitySupports)
{
    if(jEnv == NULL || obj == 0)
    {
       return NS_ERROR_FAILURE;
    }

    JSJavaThreadState *jsj_env        = NULL;
    JSObjectHandle    *handle         = (JSObjectHandle*)obj;
    JSObject          *js_obj         = handle->js_obj;
    JSContext         *cx             = NULL;
    jsval              js_val;
    JSErrorReporter    saved_state    = NULL;