如何在Google Chrome扩展程序中使用服务人员修改HTTP响应正文? [英] How to use Service Workers in Google Chrome extensions to modify an HTTP response body?
问题描述
既然Google Chrome扩展程序可以注册服务人员 ,我如何使用它们来修改来自所有主机的HTTP响应,例如通过用 dog
?
替换所有
self.addEventListener('fetch', function(event){
event.respondWith(
fetch(event.request).then(function(response){
var init = {
status:response.status,
statusText:response.statusText,
headers:{'X-Foo':'My Custom Header'}
};
response.headers.forEach(function(v,k) {
init.headers [k] = v;
});
return response.text()。then(function(body){
return new Response(body.replace (/ cat / g,'dog'),init);
});
})
);
});
解决方案
< manifest.json>:
{manifest_version name:,version:0,background:{scripts:[asd]}}
< asd>:
navigator.serviceWorker.register('sdf.js' ).then(x => console.log('done',x))
sdf.js≫:
addEventListener('fetch',e => e.respondWith(fetch / * btw xhr is undefined * /(e.request).then(r => {
if(r.headers === undefined / * request not end with< .htm> ;,< .html> * /){} else {
console.assert(r.headers.get('content-type')=== null)/ *由于某些奇怪的原因,这是空的* /// [
let h = new Headers ())
r.headers.forEach((v,k)=> h.append(k,v))
Object.defineProperty(r,'headers',{'writable':true} )
r.headers = h
r.headers.append(' content-type','text / html'/ * btw< htm> (*)替换(/ cat / g,'狗')* /)
//]
}
return r.text()。then(_ => new Response ,r))
))))
转到<网址≫ (< chrome-extension://> ext id>页面路径>>并查看替换项。
独立响应
< manifest.json≫和< asd>
< sdf.js>:
addEventListener('fetch',e => e.respondWith(new Response('url:'+ e.request.url,{headers:{'content-type':'text / html'/ *,etc * /} })))
Btw
Serviceworker还有其他一些可以深入研究的事件:
addEventListener 'message',e => {
console.log('onmessage',e)
})
addEventListener('activate',e => {
console。 log('onactivate',e)
})
addEventListener('install',e => {
console.log('oninstall',e)
})
替代品 $ b
请注意,目前serviceworker [– cf webNavigation,webRequest]是这样做的唯一方式,因为Google开发团队中的一些人认为它对响应修改webNavigation和webRequest的不安全。
注意
Chrome bug:
Now that Google Chrome extensions can register Service Workers, how can I use them in order to modify HTTP responses from all hosts, e.g. by replacing all occurrences of cat
with dog
?
Below is a sample code from Craig Russell, but how to use it inside Chrome extensions and bind it to all hosts?
self.addEventListener('fetch', function(event) {
event.respondWith(
fetch(event.request).then(function(response) {
var init = {
status: response.status,
statusText: response.statusText,
headers: {'X-Foo': 'My Custom Header'}
};
response.headers.forEach(function(v,k) {
init.headers[k] = v;
});
return response.text().then(function(body) {
return new Response(body.replace(/cat/g, 'dog'), init);
});
})
);
});
Solution
≪manifest.json≫:
{"manifest_version":2,"name":"","version":"0","background":{"scripts":["asd"]}}
≪asd≫:
navigator.serviceWorker.register('sdf.js').then(x=>console.log('done', x))
≪sdf.js≫:
addEventListener('fetch', e=> e.respondWith(fetch/*btw xhr is undefined*/(e.request).then(r=>{
if(r.headers === undefined /*request not end with <.htm>, <.html>*/){}else{
console.assert(r.headers.get('content-type')===null)/*for some odd reason this is empty*///[
let h = new Headers()
r.headers.forEach((v,k)=>h.append(k,v))
Object.defineProperty(r,'headers',{'writable':true})
r.headers = h
r.headers.append('content-type','text/html'/*btw <htm> doesnt work*/)
//]
}
return r.text().then(_=>new Response(_.replace(/cat/g,'dog'),r))
})))
Go to ≪page url≫ (≪chrome-extension://≪ext id≫/≪page path≫≫) and see the replacements.
Standalone response
≪manifest.json≫ and ≪asd≫ same as above.
≪sdf.js≫:
addEventListener('fetch', e=> e.respondWith(new Response('url: '+e.request.url,{headers:{'content-type':'text/html'/*, etc*/}})))
Btw
Serviceworker has other events that can be delved into eg:
addEventListener('message', e=>{
console.log('onmessage', e)
})
addEventListener('activate', e=>{
console.log('onactivate', e)
})
addEventListener('install', e=>{
console.log('oninstall', e)
})
Alternatives
Note that currently serviceworker [–cf webNavigation, webRequest] is the only way to do this because some lamer in Google development team has decided that its "insecure" for response-modifying webNavigation and webRequest.
Note
Chrome bugs:
- Extension ≪Reload≫ will not reload serviceworkers. You need to remove the extension and load it back in.
- Page refresh does not refresh, even with chrome devtools disable cache hard reload. Use normal page visit.
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