Refactor: plain http proxy (#1443)

adapter/inbound/http.go

@@ -2,60 +2,20 @@ package inbound
 
 import (
 	"net"
-	"net/http"
-	"strings"
 
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/context"
+	"github.com/Dreamacro/clash/transport/socks5"
 )
 
 // NewHTTP receive normal http request and return HTTPContext
-func NewHTTP(request *http.Request, conn net.Conn) *context.HTTPContext {
-	metadata := parseHTTPAddr(request)
+func NewHTTP(target string, source net.Addr, conn net.Conn) *context.ConnContext {
+	metadata := parseSocksAddr(socks5.ParseAddr(target))
+	metadata.NetWork = C.TCP
 	metadata.Type = C.HTTP
-	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
+	if ip, port, err := parseAddr(source.String()); err == nil {
 		metadata.SrcIP = ip
 		metadata.SrcPort = port
 	}
-	return context.NewHTTPContext(conn, request, metadata)
-}
-
-// RemoveHopByHopHeaders remove hop-by-hop header
-func RemoveHopByHopHeaders(header http.Header) {
-	// Strip hop-by-hop header based on RFC:
-	// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
-	// https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
-
-	header.Del("Proxy-Connection")
-	header.Del("Proxy-Authenticate")
-	header.Del("Proxy-Authorization")
-	header.Del("TE")
-	header.Del("Trailers")
-	header.Del("Transfer-Encoding")
-	header.Del("Upgrade")
-
-	connections := header.Get("Connection")
-	header.Del("Connection")
-	if len(connections) == 0 {
-		return
-	}
-	for _, h := range strings.Split(connections, ",") {
-		header.Del(strings.TrimSpace(h))
-	}
-}
-
-// RemoveExtraHTTPHostPort remove extra host port (example.com:80 --> example.com)
-// It resolves the behavior of some HTTP servers that do not handle host:80 (e.g. baidu.com)
-func RemoveExtraHTTPHostPort(req *http.Request) {
-	host := req.Host
-	if host == "" {
-		host = req.URL.Host
-	}
-
-	if pHost, port, err := net.SplitHostPort(host); err == nil && port == "80" {
-		host = pHost
-	}
-
-	req.Host = host
-	req.URL.Host = host
+	return context.NewConnContext(conn, metadata)
 }