91 lines
1.7 KiB
Go
91 lines
1.7 KiB
Go
package director
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import (
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"context"
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"net/http"
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"net/url"
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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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"gitlab.com/wpetit/goweb/logger"
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)
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type Director struct {
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repo store.ProxyRepository
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}
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func (d *Director) rewriteRequest(r *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 errors.WithStack(err)
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}
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var match *url.URL
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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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if matches := wildcard.Match(r.Host, from); !matches {
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continue
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}
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match = p.To
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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 nil
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}
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r.URL.Host = match.Host
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r.URL.Scheme = match.Scheme
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return 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.repo.QueryProxy(ctx)
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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 := make([]*store.Proxy, len(headers))
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for i, h := range headers {
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proxy, err := d.repo.GetProxy(ctx, h.ID)
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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[i] = proxy
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}
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return proxies, nil
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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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if err := d.rewriteRequest(r); 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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next.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(repo store.ProxyRepository) *Director {
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return &Director{repo}
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}
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