mirror of
https://github.com/zitadel/zitadel.git
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131 lines
3.8 KiB
Go
131 lines
3.8 KiB
Go
package middleware
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"github.com/zitadel/logging"
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"golang.org/x/text/language"
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"github.com/zitadel/zitadel/internal/api/authz"
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zitadel_http "github.com/zitadel/zitadel/internal/api/http"
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"github.com/zitadel/zitadel/internal/i18n"
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"github.com/zitadel/zitadel/internal/telemetry/tracing"
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"github.com/zitadel/zitadel/internal/zerrors"
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)
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type instanceInterceptor struct {
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verifier authz.InstanceVerifier
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headerName, externalDomain string
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ignoredPrefixes []string
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translator *i18n.Translator
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}
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func InstanceInterceptor(verifier authz.InstanceVerifier, headerName, externalDomain string, ignoredPrefixes ...string) *instanceInterceptor {
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return &instanceInterceptor{
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verifier: verifier,
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headerName: headerName,
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externalDomain: externalDomain,
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ignoredPrefixes: ignoredPrefixes,
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translator: newZitadelTranslator(),
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}
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}
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func (a *instanceInterceptor) Handler(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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a.handleInstance(w, r, next)
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})
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}
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func (a *instanceInterceptor) HandlerFunc(next http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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a.handleInstance(w, r, next)
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}
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}
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func (a *instanceInterceptor) handleInstance(w http.ResponseWriter, r *http.Request, next http.Handler) {
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for _, prefix := range a.ignoredPrefixes {
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if strings.HasPrefix(r.URL.Path, prefix) {
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next.ServeHTTP(w, r)
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return
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}
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}
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ctx, err := setInstance(r, a.verifier, a.headerName)
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if err != nil {
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origin := zitadel_http.ComposedOrigin(r.Context())
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logging.WithFields("origin", origin, "externalDomain", a.externalDomain).WithError(err).Error("unable to set instance")
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zErr := new(zerrors.ZitadelError)
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if errors.As(err, &zErr) {
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zErr.SetMessage(a.translator.LocalizeFromRequest(r, zErr.GetMessage(), nil))
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http.Error(w, fmt.Sprintf("unable to set instance using origin %s (ExternalDomain is %s): %s", origin, a.externalDomain, zErr), http.StatusNotFound)
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return
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}
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http.Error(w, fmt.Sprintf("unable to set instance using origin %s (ExternalDomain is %s)", origin, a.externalDomain), http.StatusNotFound)
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return
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}
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r = r.WithContext(ctx)
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next.ServeHTTP(w, r)
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}
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func setInstance(r *http.Request, verifier authz.InstanceVerifier, headerName string) (_ context.Context, err error) {
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ctx := r.Context()
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authCtx, span := tracing.NewServerInterceptorSpan(ctx)
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defer func() { span.EndWithError(err) }()
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host, err := HostFromRequest(r, headerName)
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if err != nil {
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return nil, zerrors.ThrowNotFound(err, "INST-zWq7X", "Errors.IAM.NotFound")
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}
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instance, err := verifier.InstanceByHost(authCtx, host)
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if err != nil {
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return nil, err
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}
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span.End()
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return authz.WithInstance(ctx, instance), nil
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}
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func HostFromRequest(r *http.Request, headerName string) (host string, err error) {
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if headerName != "host" {
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return hostFromSpecialHeader(r, headerName)
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}
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return hostFromOrigin(r.Context())
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}
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func hostFromSpecialHeader(r *http.Request, headerName string) (host string, err error) {
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host = r.Header.Get(headerName)
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if host == "" {
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return "", fmt.Errorf("host header `%s` not found", headerName)
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}
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return host, nil
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}
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func hostFromOrigin(ctx context.Context) (host string, err error) {
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defer func() {
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if err != nil {
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err = fmt.Errorf("invalid origin: %w", err)
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}
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}()
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origin := zitadel_http.ComposedOrigin(ctx)
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u, err := url.Parse(origin)
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if err != nil {
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return "", err
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}
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host = u.Host
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if host == "" {
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err = errors.New("empty host")
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}
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return host, err
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}
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func newZitadelTranslator() *i18n.Translator {
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translator, err := i18n.NewZitadelTranslator(language.English)
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logging.OnError(err).Panic("unable to get translator")
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return translator
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}
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