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101 lines
3.6 KiB
Go
101 lines
3.6 KiB
Go
/*
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Package goproxy provides a customizable HTTP proxy,
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supporting hijacking HTTPS connection.
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The intent of the proxy, is to be usable with reasonable amount of traffic
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yet, customizable and programable.
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The proxy itself is simply an `net/http` handler.
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Typical usage is
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proxy := goproxy.NewProxyHttpServer()
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proxy.OnRequest(..conditions..).Do(..requesthandler..)
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proxy.OnRequest(..conditions..).DoFunc(..requesthandlerFunction..)
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proxy.OnResponse(..conditions..).Do(..responesHandler..)
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proxy.OnResponse(..conditions..).DoFunc(..responesHandlerFunction..)
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http.ListenAndServe(":8080", proxy)
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Adding a header to each request
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proxy.OnRequest().DoFunc(func(r *http.Request,ctx *goproxy.ProxyCtx) (*http.Request, *http.Response){
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r.Header.Set("X-GoProxy","1")
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return r, nil
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})
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Note that the function is called before the proxy sends the request to the server
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For printing the content type of all incoming responses
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proxy.OnResponse().DoFunc(func(r *http.Response, ctx *goproxy.ProxyCtx)*http.Response{
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println(ctx.Req.Host,"->",r.Header.Get("Content-Type"))
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return r
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})
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note that we used the ProxyCtx context variable here. It contains the request
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and the response (Req and Resp, Resp is nil if unavailable) of this specific client
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interaction with the proxy.
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To print the content type of all responses from a certain url, we'll add a
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ReqCondition to the OnResponse function:
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proxy.OnResponse(goproxy.UrlIs("golang.org/pkg")).DoFunc(func(r *http.Response, ctx *goproxy.ProxyCtx)*http.Response{
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println(ctx.Req.Host,"->",r.Header.Get("Content-Type"))
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return r
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})
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We can write the condition ourselves, conditions can be set on request and on response
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var random = ReqConditionFunc(func(r *http.Request) bool {
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return rand.Intn(1) == 0
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})
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var hasGoProxyHeader = RespConditionFunc(func(resp *http.Response,req *http.Request)bool {
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return resp.Header.Get("X-GoProxy") != ""
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})
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Caution! If you give a RespCondition to the OnRequest function, you'll get a run time panic! It doesn't
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make sense to read the response, if you still haven't got it!
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Finally, we have convenience function to throw a quick response
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proxy.OnResponse(hasGoProxyHeader).DoFunc(func(r*http.Response,ctx *goproxy.ProxyCtx)*http.Response {
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r.Body.Close()
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return goproxy.ForbiddenTextResponse(ctx.Req,"Can't see response with X-GoProxy header!")
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})
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we close the body of the original repsonse, and return a new 403 response with a short message.
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Example use cases:
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1. https://github.com/elazarl/goproxy/tree/master/examples/goproxy-avgsize
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To measure the average size of an Html served in your site. One can ask
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all the QA team to access the website by a proxy, and the proxy will
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measure the average size of all text/html responses from your host.
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2. [not yet implemented]
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All requests to your web servers should be directed through the proxy,
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when the proxy will detect html pieces sent as a response to AJAX
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request, it'll send a warning email.
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3. https://github.com/elazarl/goproxy/blob/master/examples/goproxy-httpdump/
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Generate a real traffic to your website by real users using through
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proxy. Record the traffic, and try it again for more real load testing.
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4. https://github.com/elazarl/goproxy/tree/master/examples/goproxy-no-reddit-at-worktime
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Will allow browsing to reddit.com between 8:00am and 17:00pm
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5. https://github.com/elazarl/goproxy/tree/master/examples/goproxy-jquery-version
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Will warn if multiple versions of jquery are used in the same domain.
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6. https://github.com/elazarl/goproxy/blob/master/examples/goproxy-upside-down-ternet/
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Modifies image files in an HTTP response via goproxy's image extension found in ext/.
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*/
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package goproxy
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