Question

我即将成为Firefox插件的一个功能是阻止基于这两个标准的图像加载：

IMG来自特定（子）域（例如，* .example.com）;
IMG的网址或路径包含特定字词（RegEx）;

我在基于WebRequest的Google Chrome扩展程序中开发了此功能（请参阅下面的代码）。

background.js [Chrome扩展程序]

var regex = '/example|example2/gi';

// -- Block request
function blockRequest(details) {
    if( details.type === 'image' && details.url.split('://').pop().match(regex) ) {
        return {cancel: true};
    }
}
// -- Apply blocking
function applyBlocking(type) {
    if(chrome.webRequest.onBeforeRequest.hasListener(type))
        chrome.webRequest.onBeforeRequest.removeListener(type);
        chrome.webRequest.onBeforeRequest.addListener(type, {
            urls: [
                'https://*.example.com/proxy/*'
            ]}, ['blocking']);
}

// Block
function blockTracking(a) {
    if(a) {
        applyBlocking(blockRequest);
    }
}

我现在正在尝试在Firefox中复制它，基于SDK。基于this post和 this one，我似乎必须注册观察员并使用XPCOM。但是，我在查找有关如何使用Firefox API访问所请求的文件类型和URL的更多文档时遇到了一些困难。任何帮助表示赞赏...

main.js [Firefox扩展]

var { Cc, Ci } = require('chrome'),
         regex = '/example|example2/gi';

var ApplyBlocking = {

    observe: function(subject, topic) {
        if (topic === 'http-on-modify-request') {

        /* ??? */

        }
    },
    get observerService() {
        return Cc['@mozilla.org/observer-service;1'].getService(Ci.nsIObserverService);
    },

    register: function() {
        this.observerService.addObserver(this, 'http-on-modify-request', false);
    },

    unregister: function() {
        this.observerService.removeObserver(this, 'http-on-modify-request');
    }
};

// Block
function blockTracking(a) {
    if(a) {
        ApplyBlocking.register();
    }
}

Answer 1

我最终实施的内容，以防其他人感兴趣...

var { Cc, Ci, Cr } = require('chrome'),
         regex = '/example|example2/gi';

var ApplyBlocking = {

    observe: function(subject, topic) {
        if (topic === 'http-on-modify-request') {

           var channel = subject.QueryInterface(Ci.nsIHttpChannel);

           if ( channel.originalURI.spec.match('example.com/') && channel.originalURI.spec.split('://').pop().match(regex) ) {
               channel.cancel(Cr.NS_BINDING_ABORTED);
           }

        }
    },
    get observerService() {
        return Cc['@mozilla.org/observer-service;1'].getService(Ci.nsIObserverService);
    },

    register: function() {
        this.observerService.addObserver(this, 'http-on-modify-request', false);
    },

    unregister: function() {
        this.observerService.removeObserver(this, 'http-on-modify-request');
    }
};

// Block
function blockTracking(a) {
    if(a) {
        try { ApplyBlocking.register(); } catch(e) {}
    } else {
       try { ApplyBlocking.unregister(); } catch(e) {}
    }
}

Firefox SDK |阻止图像加载w.r.t.域

1 个答案: