William Petit
de70fa89f7
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248 lines
5.3 KiB
Go
248 lines
5.3 KiB
Go
package director
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import (
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"context"
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"net/http"
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"sort"
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"forge.cadoles.com/Cadoles/go-proxy"
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"forge.cadoles.com/Cadoles/go-proxy/wildcard"
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"forge.cadoles.com/cadoles/bouncer/internal/store"
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"github.com/pkg/errors"
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"github.com/prometheus/client_golang/prometheus"
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"gitlab.com/wpetit/goweb/logger"
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)
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type Director struct {
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proxyRepository store.ProxyRepository
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layerRepository store.LayerRepository
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layerRegistry *LayerRegistry
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}
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func (d *Director) rewriteRequest(r *http.Request) (*http.Request, error) {
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ctx := r.Context()
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proxies, err := d.getProxies(ctx)
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if err != nil {
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return r, errors.WithStack(err)
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}
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url := getRequestURL(r)
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ctx = withOriginalURL(ctx, url)
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ctx = logger.With(ctx, logger.F("url", url.String()))
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var match *store.Proxy
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MAIN:
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for _, p := range proxies {
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for _, from := range p.From {
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logger.Debug(
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ctx, "matching request with proxy's from",
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logger.F("from", from),
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)
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if matches := wildcard.Match(url.String(), from); !matches {
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continue
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}
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logger.Debug(
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ctx, "proxy's from matched",
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logger.F("from", from),
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)
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match = p
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break MAIN
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}
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}
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if match == nil {
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return r, nil
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}
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toURL, err := url.Parse(match.To)
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if err != nil {
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return r, errors.WithStack(err)
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}
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r.URL.Host = toURL.Host
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r.URL.Scheme = toURL.Scheme
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ctx = logger.With(ctx,
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logger.F("proxy", match.Name),
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logger.F("host", r.Host),
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logger.F("remoteAddr", r.RemoteAddr),
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)
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metricProxyRequestsTotal.With(prometheus.Labels{metricLabelProxy: string(match.Name)}).Add(1)
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ctx = withProxy(ctx, match)
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layers, err := d.getLayers(ctx, match.Name)
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if err != nil {
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return r, errors.WithStack(err)
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}
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ctx = withLayers(ctx, layers)
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r = r.WithContext(ctx)
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return r, nil
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}
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func (d *Director) getProxies(ctx context.Context) ([]*store.Proxy, error) {
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headers, err := d.proxyRepository.QueryProxy(ctx, store.WithProxyQueryEnabled(true))
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if err != nil {
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return nil, errors.WithStack(err)
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}
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sort.Sort(store.ByProxyWeight(headers))
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proxies := make([]*store.Proxy, 0, len(headers))
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for _, h := range headers {
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if !h.Enabled {
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continue
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}
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proxy, err := d.proxyRepository.GetProxy(ctx, h.Name)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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proxies = append(proxies, proxy)
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}
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return proxies, nil
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}
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func (d *Director) getLayers(ctx context.Context, proxyName store.ProxyName) ([]*store.Layer, error) {
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headers, err := d.layerRepository.QueryLayers(ctx, proxyName, store.WithLayerQueryEnabled(true))
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if err != nil {
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return nil, errors.WithStack(err)
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}
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sort.Sort(store.ByLayerWeight(headers))
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layers := make([]*store.Layer, 0, len(headers))
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for _, h := range headers {
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if !h.Enabled {
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continue
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}
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layer, err := d.layerRepository.GetLayer(ctx, proxyName, h.Name)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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layers = append(layers, layer)
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}
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return layers, nil
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}
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func (d *Director) RequestTransformer() proxy.RequestTransformer {
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return func(r *http.Request) {
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ctx := r.Context()
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layers, err := ctxLayers(ctx)
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if err != nil {
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if errors.Is(err, errContextKeyNotFound) {
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return
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}
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logger.Error(ctx, "could not retrieve layers from context", logger.E(errors.WithStack(err)))
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return
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}
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for _, layer := range layers {
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transformerLayer, ok := d.layerRegistry.GetRequestTransformer(layer.Type)
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if !ok {
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continue
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}
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transformer := transformerLayer.RequestTransformer(layer)
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transformer(r)
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}
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}
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}
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func (d *Director) ResponseTransformer() proxy.ResponseTransformer {
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return func(r *http.Response) error {
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ctx := r.Request.Context()
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layers, err := ctxLayers(ctx)
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if err != nil {
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if errors.Is(err, errContextKeyNotFound) {
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return nil
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}
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return errors.WithStack(err)
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}
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for _, layer := range layers {
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transformerLayer, ok := d.layerRegistry.GetResponseTransformer(layer.Type)
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if !ok {
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continue
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}
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transformer := transformerLayer.ResponseTransformer(layer)
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if err := transformer(r); err != nil {
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return errors.WithStack(err)
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}
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}
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return nil
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}
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}
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func (d *Director) Middleware() proxy.Middleware {
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return func(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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r, err := d.rewriteRequest(r)
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if err != nil {
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logger.Error(r.Context(), "could not rewrite request", logger.E(errors.WithStack(err)))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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ctx := r.Context()
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layers, err := ctxLayers(ctx)
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if err != nil {
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if errors.Is(err, errContextKeyNotFound) {
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return
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}
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logger.Error(ctx, "could not retrieve proxy and layers from context", logger.E(errors.WithStack(err)))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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httpMiddlewares := make([]proxy.Middleware, 0)
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for _, layer := range layers {
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middleware, ok := d.layerRegistry.GetMiddleware(layer.Type)
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if !ok {
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continue
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}
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httpMiddlewares = append(httpMiddlewares, middleware.Middleware(layer))
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}
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handler := createMiddlewareChain(next, httpMiddlewares)
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handler.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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}
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func New(proxyRepository store.ProxyRepository, layerRepository store.LayerRepository, layers ...Layer) *Director {
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registry := NewLayerRegistry(layers...)
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return &Director{proxyRepository, layerRepository, registry}
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}
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