initial commit

This commit is contained in:
Barna Csorogi 2015-03-28 23:07:40 +01:00
commit 343bdd5266
14 changed files with 562 additions and 0 deletions

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LICENSE Normal file
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Copyright (c) 2015, Barna Csorogi <barnacs@justletit.be>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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README Normal file
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1, Compy
Compy is an HTTP/HTTPS proxy with mitm support and basic content compression/transcoding capabilities.
2, Features:
- HTTPS proxy (encrypted connection between client and proxy)
- man in the middle support
- gzip compression
- transcode animated gif to static image
- transcode jpeg to desired quality using libjpeg
- transcode png
- html/css/js minification
3, Usage
See compy --help
4, Credits
https://github.com/pixiv/go-libjpeg
https://github.com/tdewolff/minify
5, License
See LICENSE

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compy.go Normal file
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package main
import (
"flag"
"fmt"
"github.com/barnacs/compy/proxy"
tc "github.com/barnacs/compy/transcoder"
"log"
)
var (
host = flag.String("host", ":9999", "<host:port>")
cert = flag.String("cert", "", "proxy cert path")
key = flag.String("key", "", "proxy cert key path")
ca = flag.String("ca", "", "CA path")
caKey = flag.String("cakey", "", "CA key path")
jpeg = flag.Int("jpeg", 50, "jpeg quality (1-100, 0 to disable)")
gif = flag.Bool("gif", true, "transcode gifs into static images")
png = flag.Bool("png", true, "transcode png")
minify = flag.Bool("minify", false, "minify css/html/js - WARNING: tends to break the web")
)
func main() {
flag.Parse()
p := proxy.New()
if *ca != "" {
if err := p.EnableMitm(*ca, *caKey); err != nil {
fmt.Println("not using mitm:", err)
}
}
if *jpeg != 0 {
p.AddTranscoder("image/jpeg", tc.NewJpeg(*jpeg))
}
if *gif {
p.AddTranscoder("image/gif", &tc.Gif{})
}
if *png {
p.AddTranscoder("image/png", &tc.Png{})
}
var ttc proxy.Transcoder
if *minify {
ttc = &tc.Gzip{tc.NewMinifier(), false}
} else {
ttc = &tc.Gzip{&tc.Identity{}, true}
}
p.AddTranscoder("text/css", ttc)
p.AddTranscoder("text/html", ttc)
p.AddTranscoder("text/javascript", ttc)
p.AddTranscoder("application/javascript", ttc)
p.AddTranscoder("application/x-javascript", ttc)
var err error
if *cert != "" {
err = p.StartTLS(*host, *cert, *key)
} else {
err = p.Start(*host)
}
log.Fatalln(err)
}

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proxy/certfaker.go Normal file
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package proxy
import (
"crypto"
"crypto/tls"
"crypto/x509"
)
type certFaker struct {
ca *x509.Certificate
key crypto.PrivateKey
}
func newCertFaker(caPath, keyPath string) (*certFaker, error) {
certs, err := tls.LoadX509KeyPair(caPath, keyPath)
if err != nil {
return nil, err
}
ca, err := x509.ParseCertificate(certs.Certificate[0])
if err != nil {
return nil, err
}
return &certFaker{
ca: ca,
key: certs.PrivateKey,
}, nil
}
func (cf *certFaker) FakeCert(original *x509.Certificate) (*tls.Certificate, error) {
fakeCertData, err := x509.CreateCertificate(nil, original, cf.ca, cf.ca.PublicKey, cf.key)
return &tls.Certificate{
Certificate: [][]byte{fakeCertData},
PrivateKey: cf.key,
}, err
}

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proxy/mitmlistener.go Normal file
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package proxy
import (
"crypto/tls"
"net"
)
type mitmListener struct {
c chan net.Conn
cf *certFaker
}
func newMitmListener(cf *certFaker) *mitmListener {
return &mitmListener{
c: make(chan net.Conn),
cf: cf,
}
}
func (l *mitmListener) Accept() (net.Conn, error) {
return <-l.c, nil
}
func (l *mitmListener) Close() error {
return nil
}
func (l *mitmListener) Addr() net.Addr {
return nil
}
func (l *mitmListener) Serve(conn net.Conn, host string) (net.Conn, error) {
sconn, err := tls.Dial("tcp", host, nil)
if err != nil {
return nil, err
}
fakeCert, err := l.cf.FakeCert(sconn.ConnectionState().PeerCertificates[0])
if err != nil {
sconn.Close()
return nil, err
}
tlsconf := &tls.Config{Certificates: []tls.Certificate{*fakeCert}}
l.c <- tls.Server(conn, tlsconf)
return sconn, nil
}

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proxy/proxy.go Normal file
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package proxy
import (
"fmt"
"log"
"net/http"
)
type Proxy struct {
transcoders map[string]Transcoder
ml *mitmListener
}
type Transcoder interface {
Transcode(*ResponseWriter, *ResponseReader) error
}
func New() *Proxy {
p := &Proxy{
transcoders: make(map[string]Transcoder),
ml: nil,
}
return p
}
func (p *Proxy) EnableMitm(ca, key string) error {
cf, err := newCertFaker(ca, key)
if err != nil {
return err
}
p.ml = newMitmListener(cf)
go http.Serve(p.ml, p)
return nil
}
func (p *Proxy) AddTranscoder(contentType string, transcoder Transcoder) {
p.transcoders[contentType] = transcoder
}
func (p *Proxy) Start(host string) error {
return http.ListenAndServe(host, p)
}
func (p *Proxy) StartTLS(host, cert, key string) error {
return http.ListenAndServeTLS(host, cert, key, p)
}
func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if err := p.handle(w, r); err != nil {
log.Printf("%s while serving request: %s", err, r.URL)
}
}
func (p *Proxy) handle(w http.ResponseWriter, r *http.Request) error {
if r.Method == "CONNECT" {
return p.handleConnect(w, r.Host)
}
resp, err := forward(r)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return fmt.Errorf("error forwarding request: %s", err)
}
defer resp.Body.Close()
return p.proxyResponse(newResponseWriter(w), newResponseReader(resp))
}
func forward(r *http.Request) (*http.Response, error) {
if r.URL.Scheme == "" {
r.URL.Scheme = "https"
}
if r.URL.Host == "" {
r.URL.Host = r.Host
}
r.RequestURI = ""
return http.DefaultTransport.RoundTrip(r)
}
func (p *Proxy) proxyResponse(w *ResponseWriter, r *ResponseReader) error {
w.takeHeaders(r)
transcoder, found := p.transcoders[r.ContentType()]
if !found {
return w.writeFrom(r)
}
w.setChunked()
if err := transcoder.Transcode(w, r); err != nil {
return fmt.Errorf("transcoding error: %s", err)
}
return nil
}
func (p *Proxy) handleConnect(w http.ResponseWriter, host string) error {
if p.ml == nil {
return fmt.Errorf("CONNECT received but mitm is not enabled")
}
h, ok := w.(http.Hijacker)
if !ok {
return fmt.Errorf("connection cannot be hijacked")
}
w.WriteHeader(http.StatusOK)
conn, _, err := h.Hijack()
if err != nil {
return err
}
sconn, err := p.ml.Serve(conn, host)
if err != nil {
conn.Close()
return err
}
sconn.Close() // TODO: reuse this connection for https requests
return nil
}

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proxy/response.go Normal file
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package proxy
import (
"io"
"mime"
"net/http"
)
type ResponseReader struct {
io.Reader
r *http.Response
}
func newResponseReader(r *http.Response) *ResponseReader {
return &ResponseReader{
Reader: r.Body,
r: r,
}
}
func (r *ResponseReader) ContentType() string {
cth := r.Header().Get("Content-Type")
ct, _, _ := mime.ParseMediaType(cth)
return ct
}
func (r *ResponseReader) Header() http.Header {
return r.r.Header
}
func (r *ResponseReader) Request() *http.Request {
return r.r.Request
}
type ResponseWriter struct {
io.Writer
rw http.ResponseWriter
statusCode int
headersDone bool
}
func newResponseWriter(w http.ResponseWriter) *ResponseWriter {
return &ResponseWriter{
Writer: w,
rw: w,
}
}
func (w *ResponseWriter) takeHeaders(r *ResponseReader) {
for k, v := range r.Header() {
for _, v := range v {
w.Header().Add(k, v)
}
}
w.WriteHeader(r.r.StatusCode)
}
func (w *ResponseWriter) WriteHeader(s int) {
w.statusCode = s
}
func (w *ResponseWriter) Header() http.Header {
return w.rw.Header()
}
func (w *ResponseWriter) writeFrom(r *ResponseReader) error {
w.rw.WriteHeader(r.r.StatusCode)
_, err := io.Copy(w.rw, r)
return err
}
func (w *ResponseWriter) setChunked() {
w.Header().Del("Content-Length")
}
func (w *ResponseWriter) Write(b []byte) (int, error) {
if !w.headersDone {
w.rw.WriteHeader(w.statusCode)
w.headersDone = true
}
return w.Writer.Write(b)
}

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transcoder/gif.go Normal file
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package transcoder
import (
"github.com/barnacs/compy/proxy"
"image/gif"
)
type Gif struct{}
func (t *Gif) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
img, err := gif.Decode(r)
if err != nil {
return err
}
if err = gif.Encode(w, img, nil); err != nil {
return err
}
return nil
}

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transcoder/gzip.go Normal file
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package transcoder
import (
"compress/gzip"
"github.com/barnacs/compy/proxy"
)
type Gzip struct {
proxy.Transcoder
SkipGzipped bool
}
func (t *Gzip) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
if t.decompress(r) {
gzr, err := gzip.NewReader(r.Reader)
if err != nil {
return err
}
defer gzr.Close()
r.Reader = gzr
r.Header().Del("Content-Encoding")
w.Header().Del("Content-Encoding")
}
if compress(r) {
gzw := gzip.NewWriter(w.Writer)
defer gzw.Flush()
w.Writer = gzw
w.Header().Set("Content-Encoding", "gzip")
}
return t.Transcoder.Transcode(w, r)
}
func (t *Gzip) decompress(r *proxy.ResponseReader) bool {
return !t.SkipGzipped && r.Header().Get("Content-Encoding") == "gzip"
}
func compress(r *proxy.ResponseReader) bool {
return r.Header().Get("Content-Encoding") == ""
}

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transcoder/identity.go Normal file
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package transcoder
import (
"github.com/barnacs/compy/proxy"
"io"
)
type Identity struct{}
func (i *Identity) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
_, err := io.Copy(w, r)
return err
}

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transcoder/jpeg.go Normal file
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package transcoder
import (
"github.com/barnacs/compy/proxy"
"github.com/pixiv/go-libjpeg/jpeg"
)
type Jpeg struct {
decOptions *jpeg.DecoderOptions
encOptions *jpeg.EncoderOptions
}
func NewJpeg(quality int) *Jpeg {
return &Jpeg{
decOptions: &jpeg.DecoderOptions{},
encOptions: &jpeg.EncoderOptions{
Quality: quality,
OptimizeCoding: true,
},
}
}
func (t *Jpeg) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
img, err := jpeg.Decode(r, t.decOptions)
if err != nil {
return err
}
if err = jpeg.Encode(w, img, t.encOptions); err != nil {
return err
}
return nil
}

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transcoder/minify.go Normal file
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package transcoder
import (
"github.com/barnacs/compy/proxy"
"github.com/tdewolff/minify"
"github.com/tdewolff/minify/css"
"github.com/tdewolff/minify/html"
"github.com/tdewolff/minify/js"
"github.com/tdewolff/parse"
)
func init() {
parse.MaxBuf *= 8
}
type Minifier struct {
m minify.Minify
}
func NewMinifier() *Minifier {
m := minify.New()
m.AddFunc("text/html", html.Minify)
m.AddFunc("text/css", css.Minify)
m.AddFunc("text/javascript", js.Minify)
m.AddFunc("application/javascript", js.Minify)
m.AddFunc("application/x-javascript", js.Minify)
return &Minifier{
m: m,
}
}
func (t *Minifier) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
return t.m.Minify(r.ContentType(), w, r)
}

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transcoder/png.go Normal file
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package transcoder
import (
"github.com/barnacs/compy/proxy"
"image/png"
)
type Png struct{}
func (t *Png) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
img, err := png.Decode(r)
if err != nil {
return err
}
if err = png.Encode(w, img); err != nil {
return err
}
return nil
}

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transcoder/text.go Normal file
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package transcoder
import (
"github.com/barnacs/compy/proxy"
"github.com/tdewolff/minify"
"github.com/tdewolff/minify/css"
"github.com/tdewolff/minify/html"
"github.com/tdewolff/minify/js"
"github.com/tdewolff/parse"
)
func init() {
parse.MaxBuf *= 8
}
type Text struct {
m minify.Minify
}
func NewText() *Text {
m := minify.New()
m.AddFunc("text/html", html.Minify)
m.AddFunc("text/css", css.Minify)
m.AddFunc("text/javascript", js.Minify)
m.AddFunc("application/javascript", js.Minify)
m.AddFunc("application/x-javascript", js.Minify)
return &Text{
m: m,
}
}
func (t *Text) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
return t.m.Minify(r.ContentType(), w, r)
}