mirror of
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92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
package middleware
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import (
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"context"
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"fmt"
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"net/http"
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"strings"
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"github.com/zitadel/zitadel/internal/api/authz"
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"github.com/zitadel/zitadel/internal/telemetry/tracing"
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)
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type instanceInterceptor struct {
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verifier authz.InstanceVerifier
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headerName string
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ignoredPrefixes []string
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}
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func InstanceInterceptor(verifier authz.InstanceVerifier, headerName 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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ignoredPrefixes: ignoredPrefixes,
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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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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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http.Error(w, err.Error(), http.StatusUnauthorized)
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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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}
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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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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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http.Error(w, err.Error(), http.StatusForbidden)
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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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}
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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, err
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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) (string, error) {
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host := r.Host
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if headerName != "host" {
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host = r.Header.Get(headerName)
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}
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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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