pluginobject.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "PluginObject.h"

#include "TestObject.h"
#include <assert.h>
#include <stdio.h>

#include <string.h>
#include <stdlib.h>

static void pluginInvalidate(NPObject*);
static bool pluginHasProperty(NPObject*, NPIdentifier name);
static bool pluginHasMethod(NPObject*, NPIdentifier name);
static bool pluginGetProperty(NPObject*, NPIdentifier name, NPVariant*);
static bool pluginSetProperty(NPObject*, NPIdentifier name, const NPVariant*);
static bool pluginInvoke(NPObject*, NPIdentifier name, const NPVariant* args, uint32_t argCount, NPVariant* result);
static bool pluginInvokeDefault(NPObject*, const NPVariant* args, uint32_t argCount, NPVariant* result);
static NPObject* pluginAllocate(NPP npp, NPClass*);
static void pluginDeallocate(NPObject*);

NPNetscapeFuncs* browser;

static NPClass pluginClass = {
    NP_CLASS_STRUCT_VERSION,
    pluginAllocate,
    pluginDeallocate,
    pluginInvalidate,
    pluginHasMethod,
    pluginInvoke,
    pluginInvokeDefault,
    pluginHasProperty,
    pluginGetProperty,
    pluginSetProperty,
};

NPClass *getPluginClass(void)
{
    return &pluginClass;
}

static bool identifiersInitialized = false;

#define ID_PROPERTY_PROPERTY                    0
#define ID_PROPERTY_EVENT_LOGGING               1
#define ID_PROPERTY_HAS_STREAM                  2
#define ID_PROPERTY_TEST_OBJECT                 3
#define ID_PROPERTY_LOG_DESTROY                 4
#define ID_PROPERTY_RETURN_ERROR_FROM_NEWSTREAM 5
#define NUM_PROPERTY_IDENTIFIERS                6

static NPIdentifier pluginPropertyIdentifiers[NUM_PROPERTY_IDENTIFIERS];
static const NPUTF8 *pluginPropertyIdentifierNames[NUM_PROPERTY_IDENTIFIERS] = {
    "property",
    "eventLoggingEnabled",
    "hasStream",
    "testObject",
    "logDestroy",
    "returnErrorFromNewStream",
};

#define ID_TEST_CALLBACK_METHOD     0
#define ID_TEST_GETURL              1
#define ID_REMOVE_DEFAULT_METHOD    2
#define ID_TEST_DOM_ACCESS          3
#define ID_TEST_GET_URL_NOTIFY      4
#define ID_TEST_INVOKE_DEFAULT      5
#define ID_DESTROY_STREAM           6
#define ID_TEST_ENUMERATE           7
#define ID_TEST_GETINTIDENTIFIER    8
#define ID_TEST_GET_PROPERTY        9
#define ID_TEST_EVALUATE            10
#define ID_TEST_GET_PROPERTY_RETURN_VALUE 11
#define ID_TEST_IDENTIFIER_TO_STRING 12
#define ID_TEST_IDENTIFIER_TO_INT   13
#define ID_TEST_POSTURL_FILE        14
#define ID_TEST_CONSTRUCT           15
#define ID_TEST_THROW_EXCEPTION_METHOD 16
#define ID_DESTROY_NULL_STREAM 17
#define NUM_METHOD_IDENTIFIERS      18

static NPIdentifier pluginMethodIdentifiers[NUM_METHOD_IDENTIFIERS];
static const NPUTF8 *pluginMethodIdentifierNames[NUM_METHOD_IDENTIFIERS] = {
    "testCallback",
    "getURL",
    "removeDefaultMethod",
    "testDOMAccess",
    "getURLNotify",
    "testInvokeDefault",
    "destroyStream",
    "testEnumerate",
    "testGetIntIdentifier",
    "testGetProperty",
    "testEvaluate",
    "testGetPropertyReturnValue",
    "testIdentifierToString",
    "testIdentifierToInt",
    "testPostURLFile",
    "testConstruct",
    "testThrowException",
    "destroyNullStream"
};

static NPUTF8* createCStringFromNPVariant(const NPVariant* variant)
{
    size_t length = NPVARIANT_TO_STRING(*variant).UTF8Length;
    NPUTF8* result = (NPUTF8*)malloc(length + 1);
    memcpy(result, NPVARIANT_TO_STRING(*variant).UTF8Characters, length);
    result[length] = '\0';
    return result;
}

static void initializeIdentifiers(void)
{
    browser->getstringidentifiers(pluginPropertyIdentifierNames, NUM_PROPERTY_IDENTIFIERS, pluginPropertyIdentifiers);
    browser->getstringidentifiers(pluginMethodIdentifierNames, NUM_METHOD_IDENTIFIERS, pluginMethodIdentifiers);
}

static bool pluginHasProperty(NPObject *obj, NPIdentifier name)
{
    for (int i = 0; i < NUM_PROPERTY_IDENTIFIERS; i++)
        if (name == pluginPropertyIdentifiers[i])
            return true;
    return false;
}

static bool pluginHasMethod(NPObject *obj, NPIdentifier name)
{
    for (int i = 0; i < NUM_METHOD_IDENTIFIERS; i++)
        if (name == pluginMethodIdentifiers[i])
            return true;
    return false;
}

static bool pluginGetProperty(NPObject* obj, NPIdentifier name, NPVariant* result)
{
    PluginObject* plugin = reinterpret_cast<PluginObject*>(obj);
    if (name == pluginPropertyIdentifiers[ID_PROPERTY_PROPERTY]) {
        STRINGZ_TO_NPVARIANT("property", *result);
        return true;
    } else if (name == pluginPropertyIdentifiers[ID_PROPERTY_EVENT_LOGGING]) {
        BOOLEAN_TO_NPVARIANT(plugin->eventLogging, *result);
        return true;
    } else if (name == pluginPropertyIdentifiers[ID_PROPERTY_LOG_DESTROY]) {
        BOOLEAN_TO_NPVARIANT(plugin->logDestroy, *result);
        return true;
    } else if (name == pluginPropertyIdentifiers[ID_PROPERTY_HAS_STREAM]) {
        BOOLEAN_TO_NPVARIANT(plugin->stream != 0, *result);
        return true;
    } else if (name == pluginPropertyIdentifiers[ID_PROPERTY_TEST_OBJECT]) {
        NPObject* testObject = plugin->testObject;
        browser->retainobject(testObject);
        OBJECT_TO_NPVARIANT(testObject, *result);
        return true;
    } else if (name == pluginPropertyIdentifiers[ID_PROPERTY_RETURN_ERROR_FROM_NEWSTREAM]) {
        BOOLEAN_TO_NPVARIANT(plugin->returnErrorFromNewStream, *result);
        return true;
    }
    return false;
}

static bool pluginSetProperty(NPObject* obj, NPIdentifier name, const NPVariant* variant)
{
    PluginObject* plugin = reinterpret_cast<PluginObject*>(obj);
    if (name == pluginPropertyIdentifiers[ID_PROPERTY_EVENT_LOGGING]) {
        plugin->eventLogging = NPVARIANT_TO_BOOLEAN(*variant);
        return true;
    } else if (name == pluginPropertyIdentifiers[ID_PROPERTY_LOG_DESTROY]) {
        plugin->logDestroy = NPVARIANT_TO_BOOLEAN(*variant);
        return true;
    } else if (name == pluginPropertyIdentifiers[ID_PROPERTY_RETURN_ERROR_FROM_NEWSTREAM]) {
        plugin->returnErrorFromNewStream = NPVARIANT_TO_BOOLEAN(*variant);
        return true;
    }

    return false;
}

static bool testDOMAccess(PluginObject* obj, const NPVariant*, uint32_t, NPVariant* result)
{
    // Get plug-in's DOM element
    NPObject* elementObject;
    if (browser->getvalue(obj->npp, NPNVPluginElementNPObject, &elementObject) == NPERR_NO_ERROR) {
        // Get style
        NPVariant styleVariant;
        NPIdentifier styleIdentifier = browser->getstringidentifier("style");
        if (browser->getproperty(obj->npp, elementObject, styleIdentifier, &styleVariant) && NPVARIANT_IS_OBJECT(styleVariant)) {
            // Set style.border
            NPIdentifier borderIdentifier = browser->getstringidentifier("border");
            NPVariant borderVariant;
            STRINGZ_TO_NPVARIANT("3px solid red", borderVariant);
            browser->setproperty(obj->npp, NPVARIANT_TO_OBJECT(styleVariant), borderIdentifier, &borderVariant);
            browser->releasevariantvalue(&styleVariant);
        }

        browser->releaseobject(elementObject);
    }
    VOID_TO_NPVARIANT(*result);
    return true;
}

static NPIdentifier stringVariantToIdentifier(NPVariant variant)
{
    assert(NPVARIANT_IS_STRING(variant));
    NPUTF8* utf8String = createCStringFromNPVariant(&variant);
    NPIdentifier identifier = browser->getstringidentifier(utf8String);
    free(utf8String);
    return identifier;
}

static NPIdentifier int32VariantToIdentifier(NPVariant variant)
{
    assert(NPVARIANT_IS_INT32(variant));
    int32 integer = NPVARIANT_TO_INT32(variant);
    return browser->getintidentifier(integer);
}

static NPIdentifier doubleVariantToIdentifier(NPVariant variant)
{
    assert(NPVARIANT_IS_DOUBLE(variant));
    double value = NPVARIANT_TO_DOUBLE(variant);
    // Sadly there is no "getdoubleidentifier"
    int32 integer = static_cast<int32>(value);
    return browser->getintidentifier(integer);
}

static NPIdentifier variantToIdentifier(NPVariant variant)
{
    if (NPVARIANT_IS_STRING(variant))
        return stringVariantToIdentifier(variant);
    else if (NPVARIANT_IS_INT32(variant))
        return int32VariantToIdentifier(variant);
    else if (NPVARIANT_IS_DOUBLE(variant))
        return doubleVariantToIdentifier(variant);
    return 0;
}

static bool testIdentifierToString(PluginObject*, const NPVariant* args, uint32_t argCount, NPVariant* result)
{
    if (argCount != 1)
        return false;
    NPIdentifier identifier = variantToIdentifier(args[0]);
    if (!identifier)
        return false;
    NPUTF8* utf8String = browser->utf8fromidentifier(identifier);
    if (!utf8String)
        return false;
    STRINGZ_TO_NPVARIANT(utf8String, *result);
    return true;
}

static bool testIdentifierToInt(PluginObject*, const NPVariant* args, uint32_t argCount, NPVariant* result)
{
    if (argCount != 1)
        return false;
    NPIdentifier identifier = variantToIdentifier(args[0]);
    if (!identifier)
        return false;
    int32 integer = browser->intfromidentifier(identifier);
    INT32_TO_NPVARIANT(integer, *result);
    return true;
}

static bool testCallback(PluginObject* obj, const NPVariant* args, uint32_t argCount, NPVariant* result)
{
    if (argCount == 0 || !NPVARIANT_IS_STRING(args[0]))
        return false;

    NPObject* windowScriptObject;
    browser->getvalue(obj->npp, NPNVWindowNPObject, &windowScriptObject);

    NPUTF8* callbackString = createCStringFromNPVariant(&args[0]);
    NPIdentifier callbackIdentifier = browser->getstringidentifier(callbackString);
    free(callbackString);

    NPVariant browserResult;
    browser->invoke(obj->npp, windowScriptObject, callbackIdentifier, 0, 0, &browserResult);
    browser->releasevariantvalue(&browserResult);

    browser->releaseobject(windowScriptObject);
    
    VOID_TO_NPVARIANT(*result);
    return true;
}

static bool getURL(PluginObject* obj, const NPVariant* args, uint32_t argCount, NPVariant* result)
{
    if (argCount == 2 && NPVARIANT_IS_STRING(args[0]) && NPVARIANT_IS_STRING(args[1])) {
        NPUTF8* urlString = createCStringFromNPVariant(&args[0]);
        NPUTF8* targetString = createCStringFromNPVariant(&args[1]);
        NPError npErr = browser->geturl(obj->npp, urlString, targetString);
        free(urlString);
        free(targetString);

        INT32_TO_NPVARIANT(npErr, *result);
        return true;
    } else if (argCount == 1 && NPVARIANT_IS_STRING(args[0])) {
        NPUTF8* urlString = createCStringFromNPVariant(&args[0]);
        NPError npErr = browser->geturl(obj->npp, urlString, 0);
        free(urlString);

        INT32_TO_NPVARIANT(npErr, *result);
        return true;
    }
    return false;
}

static bool removeDefaultMethod(PluginObject*, const NPVariant* args, uint32_t argCount, NPVariant* result)
{
    pluginClass.invokeDefault = 0;
    VOID_TO_NPVARIANT(*result);
    return true;
}

static bool getURLNotify(PluginObject* obj, const NPVariant* args, uint32_t argCount, NPVariant* result)
{
    if (argCount != 3 || !NPVARIANT_IS_STRING(args[0])
        || (!NPVARIANT_IS_STRING(args[1]) && !NPVARIANT_IS_NULL(args[1]))
        || !NPVARIANT_IS_STRING(args[2]))
        return false;

    NPUTF8* urlString = createCStringFromNPVariant(&args[0]);
    NPUTF8* targetString = (NPVARIANT_IS_STRING(args[1]) ? createCStringFromNPVariant(&args[1]) : NULL);
    NPUTF8* callbackString = createCStringFromNPVariant(&args[2]);

    NPIdentifier callbackIdentifier = browser->getstringidentifier(callbackString);
    browser->geturlnotify(obj->npp, urlString, targetString, callbackIdentifier);

    free(urlString);
    free(targetString);
    free(callbackString);

    VOID_TO_NPVARIANT(*result);
    return true;
}

static bool testInvokeDefault(PluginObject* obj, const NPVariant* args, uint32_t argCount, NPVariant* result)