First run

.gitignore

@@ -0,0 +1,23 @@
+*.bak
+*.old
+*~
+*.cache
+*.swap
+*.swp
+
+*.o
+*.a
+*.so
+*.exe
+*.dll
+*.py[co]
+
+.DS_Store
+
+*.project
+*.includepath
+*.settings
+*.sublime-project
+*.sublime-workspace
+*.idea
+*.vscode

ca.go

@@ -0,0 +1,158 @@
+package httpproxy
+
+import (
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"math/big"
+	mrand "math/rand"
+	"net"
+	"sort"
+	"time"
+)
+
+var DefaultCaCert = []byte(`-----BEGIN CERTIFICATE-----
+MIIFkzCCA3ugAwIBAgIJAKEbW2ujNjX9MA0GCSqGSIb3DQEBCwUAMGAxCzAJBgNV
+BAYTAlRSMREwDwYDVQQIDAhJc3RhbmJ1bDEVMBMGA1UECgwMZ28taHR0cHByb3h5
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+MgzNfZ7WlnaJf2rfHJbvK9VqJ9z6dLRYPjCHhakJBtzsMdxysEGJ
+-----END CERTIFICATE-----`)
+
+var DefaultCaKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
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+/xlPPTPbY5qoMAT7kK71kd4Ypnqbcs3UPpAHtcPkjWpuWOlebK0J7UYToj4f
+-----END RSA PRIVATE KEY-----`)
+
+func signHosts(ca tls.Certificate, hosts []string) (cert tls.Certificate, error error) {
+	var x509ca *x509.Certificate
+	if x509ca, error = x509.ParseCertificate(ca.Certificate[0]); error != nil {
+		return
+	}
+	start := time.Unix(0, 0)
+	end, _ := time.Parse("2006-01-02", "2038-01-19")
+	serial := hashSortedBigInt(append(hosts, "1"))
+	template := x509.Certificate{
+		SerialNumber:          serial,
+		Issuer:                x509ca.Subject,
+		Subject:               pkix.Name{},
+		NotBefore:             start,
+		NotAfter:              end,
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+	}
+	for _, h := range hosts {
+		if ip := net.ParseIP(h); ip != nil {
+			template.IPAddresses = append(template.IPAddresses, ip)
+		} else {
+			template.DNSNames = append(template.DNSNames, h)
+		}
+	}
+
+	rnd := mrand.New(mrand.NewSource(serial.Int64()))
+
+	var certPriv *rsa.PrivateKey
+	if certPriv, error = rsa.GenerateKey(rnd, 1024); error != nil {
+		return
+	}
+	var derBytes []byte
+	if derBytes, error = x509.CreateCertificate(rnd, &template, x509ca, &certPriv.PublicKey, ca.PrivateKey); error != nil {
+		return
+	}
+	return tls.Certificate{
+		Certificate: [][]byte{derBytes, ca.Certificate[0]},
+		PrivateKey:  certPriv,
+	}, nil
+}
+
+func hashSorted(lst []string) []byte {
+	c := make([]string, len(lst))
+	copy(c, lst)
+	sort.Strings(c)
+	h := sha1.New()
+	for _, s := range c {
+		h.Write([]byte(s + ","))
+	}
+	return h.Sum(nil)
+}
+
+func hashSortedBigInt(lst []string) *big.Int {
+	rv := new(big.Int)
+	rv.SetBytes(hashSorted(lst))
+	return rv
+}

ca_cert.pem

@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
+MIIFkzCCA3ugAwIBAgIJAKEbW2ujNjX9MA0GCSqGSIb3DQEBCwUAMGAxCzAJBgNV
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+MgzNfZ7WlnaJf2rfHJbvK9VqJ9z6dLRYPjCHhakJBtzsMdxysEGJ
+-----END CERTIFICATE-----

ca_key.pem

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIJKQIBAAKCAgEA18cwaaZzhdDEpUXpR9pkYRqsSdT30WhynFhFtcaBOf4eYdpt
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+/xlPPTPbY5qoMAT7kK71kd4Ypnqbcs3UPpAHtcPkjWpuWOlebK0J7UYToj4f
+-----END RSA PRIVATE KEY-----

connrespwr.go

@@ -0,0 +1,55 @@
+package httpproxy
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"sync"
+)
+
+type ConnResponseWriter struct {
+	Conn        net.Conn
+	mu          sync.Mutex
+	code        int
+	header      http.Header
+	headersSent bool
+}
+
+func NewConnResponseWriter(conn net.Conn) *ConnResponseWriter {
+	return &ConnResponseWriter{Conn: conn, header: make(http.Header)}
+}
+
+func (c *ConnResponseWriter) Header() http.Header {
+	return c.header
+}
+
+func (c *ConnResponseWriter) Write(body []byte) (int, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if !c.headersSent {
+		c.headersSent = true
+		st := http.StatusText(c.code)
+		if st != "" {
+			st = " " + st
+		}
+		if _, err := io.WriteString(c.Conn, fmt.Sprintf("HTTP/1.1 %d%s\r\n", c.code, st)); err != nil {
+			return 0, err
+		}
+		if err := c.header.Write(c.Conn); err != nil {
+			return 0, err
+		}
+		if _, err := io.WriteString(c.Conn, "\r\n"); err != nil {
+			return 0, err
+		}
+	}
+	return c.Conn.Write(body)
+}
+
+func (c *ConnResponseWriter) WriteHeader(code int) {
+	c.code = code
+}
+
+func (c *ConnResponseWriter) Close() error {
+	return c.Conn.Close()
+}

context.go

@@ -0,0 +1,12 @@
+package httpproxy
+
+import "net/http"
+
+// Context defines context of each proxy connection.
+type Context struct {
+	Prx           *Proxy
+	SessionNo     int64
+	ConnectAction ConnectAction
+	ConnectReq    *http.Request
+	UserData      interface{}
+}

demo/.gitignore

@@ -0,0 +1 @@
+/demo

demo/main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/go-httpproxy/httpproxy"
+)
+
+func OnError(ctx *httpproxy.Context, when string, err *httpproxy.Error, opErr error) {
+	log.Printf("%s %s %s", when, err, opErr)
+}
+
+func OnAccept(ctx *httpproxy.Context, req *http.Request) *http.Response {
+	return nil
+}
+
+func OnAuth(ctx *httpproxy.Context, user string, pass string) bool {
+	if user == "test" && pass == "1234" {
+		return true
+	}
+	return false
+}
+
+func OnConnect(ctx *httpproxy.Context, host string) (httpproxy.ConnectAction, string) {
+	return httpproxy.ConnectMitm, host
+}
+
+func OnRequest(ctx *httpproxy.Context, req *http.Request) *http.Response {
+	return nil
+}
+
+func OnResponse(ctx *httpproxy.Context, req *http.Request, resp *http.Response) {
+	resp.Header.Add("Via", "test")
+}
+
+func main() {
+	prx, _ := httpproxy.NewProxy()
+	prx.OnError = OnError
+	prx.OnAccept = OnAccept
+	prx.OnAuth = OnAuth
+	prx.OnConnect = OnConnect
+	prx.OnRequest = OnRequest
+	prx.OnResponse = OnResponse
+
+	http.ListenAndServe(":8080", prx)
+}