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package goproxy
import (
"net/http"
"regexp"
)
// ProxyCtx is the Proxy context, contains useful information about every request. It is passed to
// every user function. Also used as a logger.
type ProxyCtx struct {
// Will contain the client request from the proxy
Req *http.Request
// Will contain the remote server's response (if available. nil if the request wasn't send yet)
Resp *http.Response
RoundTripper RoundTripper
// will contain the recent error that occured while trying to send receive or parse traffic
Error error
// A handle for the user to keep data in the context, from the call of ReqHandler to the
// call of RespHandler
UserData interface{}
// Will connect a request to a response
Session int64
proxy *ProxyHttpServer
}
type RoundTripper interface {
RoundTrip(req *http.Request, ctx *ProxyCtx) (*http.Response, error)
}
type RoundTripperFunc func(req *http.Request, ctx *ProxyCtx) (*http.Response, error)
func (f RoundTripperFunc) RoundTrip(req *http.Request, ctx *ProxyCtx) (*http.Response, error) {
return f(req, ctx)
}
func (ctx *ProxyCtx) RoundTrip(req *http.Request) (*http.Response, error) {
if ctx.RoundTripper != nil {
return ctx.RoundTripper.RoundTrip(req, ctx)
}
return ctx.proxy.Tr.RoundTrip(req)
}
func (ctx *ProxyCtx) printf(msg string, argv ...interface{}) {
ctx.proxy.Logger.Printf("[%03d] "+msg+"\n", append([]interface{}{ctx.Session & 0xFF}, argv...)...)
}
// Logf prints a message to the proxy's log. Should be used in a ProxyHttpServer's filter
// This message will be printed only if the Verbose field of the ProxyHttpServer is set to true
//
// proxy.OnRequest().DoFunc(func(r *http.Request,ctx *goproxy.ProxyCtx) *http.Request{
// nr := atomic.AddInt32(&counter,1)
// ctx.Printf("So far %d requests",nr)
// return r
// })
func (ctx *ProxyCtx) Logf(msg string, argv ...interface{}) {
if ctx.proxy.Verbose {
ctx.printf("INFO: "+msg, argv...)
}
}
// Warnf prints a message to the proxy's log. Should be used in a ProxyHttpServer's filter
// This message will always be printed.
//
// proxy.OnRequest().DoFunc(func(r *http.Request,ctx *goproxy.ProxyCtx) *http.Request{
// f,err := os.OpenFile(cachedContent)
// if err != nil {
// ctx.Warnf("error open file %v: %v",cachedContent,err)
// return r
// }
// return r
// })
func (ctx *ProxyCtx) Warnf(msg string, argv ...interface{}) {
ctx.printf("WARN: "+msg, argv...)
}
var charsetFinder = regexp.MustCompile("charset=([^ ;]*)")
// Will try to infer the character set of the request from the headers.
// Returns the empty string if we don't know which character set it used.
// Currently it will look for charset=<charset> in the Content-Type header of the request.
func (ctx *ProxyCtx) Charset() string {
charsets := charsetFinder.FindStringSubmatch(ctx.Resp.Header.Get("Content-Type"))
if charsets == nil {
return ""
}
return charsets[1]
}
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