我看到很多页面都在谈论如何拦截来自站点的 HTTP 响应。我正在尝试这个:Chrome Extension - How to get HTTP Response Body? 没有可执行程序...这是我的代码:
list .json:
{
"manifest_version": 2,
"name": "Extension Name",
"description": "Some Desc.",
"version": "1.1",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "index.html"
},
"permissions": [
"activeTab",
"storage",
"tabs",
"https://*.google.com/"
],
"content_scripts": [
{
"matches": ["https://*.google.com/"],
"run_at": "document_start",
"js": ["contentscript.js", "inject.js"]
}
],
"web_accessible_resources": ["injected.js"]
}
index.html:
<html>
<head>
<script src="contentscript.js"></script>
</head>
<body>
<p>HTTP INTERCEPTOR</p>
</body>
</html>
注入(inject).js:
(function(xhr) {
console.log('injeced file');
var XHR = XMLHttpRequest.prototype;
var open = XHR.open;
var send = XHR.send;
var setRequestHeader = XHR.setRequestHeader;
XHR.open = function(method, url) {
this._method = method;
this._url = url;
this._requestHeaders = {};
this._startTime = (new Date()).toISOString();
return open.apply(this, arguments);
};
XHR.setRequestHeader = function(header, value) {
this._requestHeaders[header] = value;
return setRequestHeader.apply(this, arguments);
};
XHR.send = function(postData) {
this.addEventListener('load', function() {
var endTime = (new Date()).toISOString();
var myUrl = this._url ? this._url.toLowerCase() : this._url;
if(myUrl) {
if (postData) {
if (typeof postData === 'string') {
try {
// here you get the REQUEST HEADERS, in JSON format, so you can also use JSON.parse
this._requestHeaders = postData;
} catch(err) {
console.log('Request Header JSON decode failed, transfer_encoding field could be base64');
console.log(err);
}
} else if (typeof postData === 'object' || typeof postData === 'array' || typeof postData === 'number' || typeof postData === 'boolean') {
// do something if you need
}
}
// here you get the RESPONSE HEADERS
var responseHeaders = this.getAllResponseHeaders();
if ( this.responseType != 'blob' && this.responseText) {
// responseText is string or null
try {
// here you get RESPONSE TEXT (BODY), in JSON format, so you can use JSON.parse
var arr = this.responseText;
// printing url, request headers, response headers, response body, to console
console.log(this._url);
console.log(JSON.parse(this._requestHeaders));
console.log(responseHeaders);
console.log(JSON.parse(arr));
} catch(err) {
console.log("Error in responseType try catch");
console.log(err);
}
}
}
});
return send.apply(this, arguments);
};
})(XMLHttpRequest);
inject.js 我设置了一个超时，这样我就可以启用调试器了:
/**
* code in inject.js
* added "web_accessible_resources": ["injected.js"] to manifest.json
*/
setTimeout(function() {
var s = document.createElement('script');
s.src = chrome.extension.getURL('injected.js');
s.onload = function() {
this.remove();
console.log('remove');
};
(document.head || document.documentElement).appendChild(s);
}, 10000);
为什么代码没有注入(inject)https://www.google.com/？检查 DOM 我没有看到代码...代码运行并且 xhr 已启动但是方法 open、setRequestHeader 和 send 永远不会被调用。
最佳答案
代码来 self 的回答here . 在这种情况下，内容脚本用于与 injected.js 通信。
示例代码如下:
/**
* Content script currently only used to communicate extension state on off message to injected.js
* Sends back response to extension (popup.js) after sending message to injected.js
*/
$(function(){
// localStorage is different from chrome.storage
// localStorage for injected script, and chrome.storage for extension script (popup.js) and contentscript.js
chrome.storage.sync.get("state", function (data) {
if (typeof data.state === 'undefined') {
chrome.storage.sync.set({"state": "on"}, function() {}); // async
}
console.log("Content Script State: " + data.state);
});
// message from extension script to this content script.
// will be used to receive enable disable messages
// sends response in 'status' variable
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
console.log(sender.tab ?
"content script receiving message from a content script:" + sender.tab.url :
"content script receiving message from the extension");
if (request.toggle === true) {
chrome.storage.sync.set({"state": "on"}, function() { console.log("Content Script State Updated: on"); }); // async
var data = {
app_state: "on"
};
document.dispatchEvent(new CustomEvent("app_state_message", {detail: data}));
// cannot return state in function since above .set is async and popup.js does not receive the response
sendResponse({state: "on"});
} else if (request.toggle === false) {
chrome.storage.sync.set({"state": "off"}, function() { console.log("Content Script State Updated: off"); }); // async
var data = {
app_state: "off"
};
document.dispatchEvent(new CustomEvent("app_state_message", {detail: data}));
sendResponse({state: "off"});
} else {
sendResponse({state: "error"});
}
});
});
请在 Content Scripts 上阅读更多内容.希望你觉得这很有用。
关于javascript - Chrome 扩展 : intercept HTTP Response，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52669328/