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add http body rewrite for forward handler

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This commit is contained in:
ginuerzh
2024-07-19 20:45:04 +08:00
parent c0a80400d2
commit 3656ba9315
6 changed files with 144 additions and 11 deletions
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62
handler/forward/local/handler.go
View File

@ -2,6 +2,7 @@ package local
import (
"bufio"
"bytes"
"context"
"crypto/tls"
"errors"
@ -179,8 +180,9 @@ func (h *forwardHandler) Handle(ctx context.Context, conn net.Conn, opts ...hand
func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remoteAddr net.Addr, log logger.Logger) (err error) {
br := bufio.NewReader(rw)
var cc net.Conn
for {
var cc net.Conn
resp := &http.Response{
ProtoMajor: 1,
ProtoMinor: 1,
@ -241,6 +243,7 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
})
log.Debugf("find node for host %s -> %s(%s)", req.Host, target.Name, target.Addr)
var bodyRewrites []chain.HTTPBodyRewriteSettings
if httpSettings := target.Options().HTTP; httpSettings != nil {
if auther := httpSettings.Auther; auther != nil {
username, password, _ := req.BasicAuth()
@ -261,7 +264,7 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
req.Header.Set(k, v)
}
for _, re := range httpSettings.Rewrite {
for _, re := range httpSettings.RewriteURL {
if re.Pattern.MatchString(req.URL.Path) {
if s := re.Pattern.ReplaceAllString(req.URL.Path, re.Replacement); s != "" {
req.URL.Path = s
@ -269,6 +272,8 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
}
}
}
bodyRewrites = httpSettings.RewriteBody
}
cc, err = h.options.Router.Dial(ctx, "tcp", target.Addr)
@ -329,6 +334,11 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
log.Trace(string(dump))
}
if err := h.rewriteBody(res, bodyRewrites...); err != nil {
log.Errorf("rewrite body: %v", err)
return
}
if err = res.Write(rw); err != nil {
log.Errorf("write response from node %s(%s): %v", target.Name, target.Addr, err)
}
@ -348,6 +358,54 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
return
}
func (h *forwardHandler) rewriteBody(resp *http.Response, rewrites ...chain.HTTPBodyRewriteSettings) error {
if resp == nil || len(rewrites) == 0 || resp.ContentLength <= 0 {
return nil
}
if encoding := resp.Header.Get("Content-Encoding"); encoding != "" {
return nil
}
body, err := drainBody(resp.Body)
if err != nil || body == nil {
return err
}
contentType, _, _ := strings.Cut(resp.Header.Get("Content-Type"), ";")
for _, rewrite := range rewrites {
rewriteType := rewrite.Type
if rewriteType == "" {
rewriteType = "text/html"
}
if rewriteType != "*" && !strings.Contains(rewriteType, contentType) {
continue
}
body = rewrite.Pattern.ReplaceAll(body, rewrite.Replacement)
}
resp.Body = io.NopCloser(bytes.NewReader(body))
resp.ContentLength = int64(len(body))
return nil
}
func drainBody(b io.ReadCloser) (body []byte, err error) {
if b == nil || b == http.NoBody {
// No copying needed. Preserve the magic sentinel meaning of NoBody.
return nil, nil
}
var buf bytes.Buffer
if _, err = buf.ReadFrom(b); err != nil {
return nil, err
}
if err = b.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (h *forwardHandler) checkRateLimit(addr net.Addr) bool {
if h.options.RateLimiter == nil {
return true

57
handler/forward/remote/handler.go
View File

@ -2,6 +2,7 @@ package remote
import (
"bufio"
"bytes"
"context"
"crypto/tls"
"errors"
@ -179,9 +180,9 @@ func (h *forwardHandler) Handle(ctx context.Context, conn net.Conn, opts ...hand
func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remoteAddr net.Addr, localAddr net.Addr, log logger.Logger) (err error) {
br := bufio.NewReader(rw)
var cc net.Conn
for {
var cc net.Conn
resp := &http.Response{
ProtoMajor: 1,
ProtoMinor: 1,
@ -242,6 +243,7 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
})
log.Debugf("find node for host %s -> %s(%s)", req.Host, target.Name, target.Addr)
var bodyRewrites []chain.HTTPBodyRewriteSettings
if httpSettings := target.Options().HTTP; httpSettings != nil {
if auther := httpSettings.Auther; auther != nil {
username, password, _ := req.BasicAuth()
@ -261,7 +263,7 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
req.Header.Set(k, v)
}
for _, re := range httpSettings.Rewrite {
for _, re := range httpSettings.RewriteURL {
if re.Pattern.MatchString(req.URL.Path) {
if s := re.Pattern.ReplaceAllString(req.URL.Path, re.Replacement); s != "" {
req.URL.Path = s
@ -269,6 +271,8 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
}
}
}
bodyRewrites = httpSettings.RewriteBody
}
cc, err = h.options.Router.Dial(ctx, "tcp", target.Addr)
@ -331,6 +335,11 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
log.Trace(string(dump))
}
if err := h.rewriteBody(res, bodyRewrites...); err != nil {
log.Errorf("rewrite body: %v", err)
return
}
if err = res.Write(rw); err != nil {
log.Errorf("write response from node %s(%s): %v", target.Name, target.Addr, err)
}
@ -350,6 +359,50 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
return
}
func (h *forwardHandler) rewriteBody(resp *http.Response, rewrites ...chain.HTTPBodyRewriteSettings) error {
if resp == nil || len(rewrites) == 0 || resp.ContentLength <= 0 {
return nil
}
body, err := drainBody(resp.Body)
if err != nil || body == nil {
return err
}
contentType, _, _ := strings.Cut(resp.Header.Get("Content-Type"), ";")
for _, rewrite := range rewrites {
rewriteType := rewrite.Type
if rewriteType == "" {
rewriteType = "text/html"
}
if rewriteType != "*" && !strings.Contains(rewriteType, contentType) {
continue
}
body = rewrite.Pattern.ReplaceAll(body, rewrite.Replacement)
}
resp.Body = io.NopCloser(bytes.NewReader(body))
resp.ContentLength = int64(len(body))
return nil
}
func drainBody(b io.ReadCloser) (body []byte, err error) {
if b == nil || b == http.NoBody {
// No copying needed. Preserve the magic sentinel meaning of NoBody.
return nil, nil
}
var buf bytes.Buffer
if _, err = buf.ReadFrom(b); err != nil {
return nil, err
}
if err = b.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (h *forwardHandler) checkRateLimit(addr net.Addr) bool {
if h.options.RateLimiter == nil {
return true