bouncer/internal/proxy/director/director.go

136 lines
2.7 KiB
Go

package director
import (
"context"
"net/http"
"forge.cadoles.com/Cadoles/go-proxy"
"forge.cadoles.com/Cadoles/go-proxy/wildcard"
"forge.cadoles.com/cadoles/bouncer/internal/store"
"github.com/davecgh/go-spew/spew"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
type Director struct {
proxyRepository store.ProxyRepository
layerRegistry *LayerRegistry
}
func (d *Director) rewriteRequest(r *http.Request) (*http.Request, error) {
ctx := r.Context()
proxies, err := d.getProxies(ctx)
if err != nil {
return r, errors.WithStack(err)
}
var match *store.Proxy
MAIN:
for _, p := range proxies {
for _, from := range p.From {
if matches := wildcard.Match(r.Host, from); !matches {
continue
}
match = p
break MAIN
}
}
if match == nil {
return r, nil
}
r.URL.Host = match.To.Host
r.URL.Scheme = match.To.Scheme
ctx = withProxy(ctx, match)
r = r.WithContext(ctx)
return r, nil
}
func (d *Director) getProxies(ctx context.Context) ([]*store.Proxy, error) {
headers, err := d.proxyRepository.QueryProxy(ctx)
if err != nil {
return nil, errors.WithStack(err)
}
proxies := make([]*store.Proxy, len(headers))
for i, h := range headers {
proxy, err := d.proxyRepository.GetProxy(ctx, h.Name)
if err != nil {
return nil, errors.WithStack(err)
}
proxies[i] = proxy
}
return proxies, nil
}
func (d *Director) RequestTransformer() proxy.RequestTransformer {
return func(r *http.Request) {
ctx := r.Context()
_, err := ctxProxy(ctx)
if err != nil {
if errors.Is(err, errContextKeyNotFound) {
return
}
logger.Error(ctx, "could not retrieve proxy from context", logger.E(errors.WithStack(err)))
return
}
// spew.Dump(proxy)
}
}
func (d *Director) ResponseTransformer() proxy.ResponseTransformer {
return func(r *http.Response) error {
ctx := r.Request.Context()
proxy, err := ctxProxy(ctx)
if err != nil {
if errors.Is(err, errContextKeyNotFound) {
return nil
}
logger.Error(ctx, "could not retrieve proxy from context", logger.E(errors.WithStack(err)))
return nil
}
spew.Dump(proxy)
return nil
}
}
func (d *Director) Middleware() proxy.Middleware {
return func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
r, err := d.rewriteRequest(r)
if err != nil {
logger.Error(r.Context(), "could not rewrite request", logger.E(errors.WithStack(err)))
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
next.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
}
func New(repo store.ProxyRepository, layers ...Layer) *Director {
registry := NewLayerRegistry(layers...)
return &Director{repo, registry}
}