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unauthorized_middleware.go
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unauthorized_middleware.go
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package http
import (
"context"
"encoding/json"
"io/ioutil"
"net/http"
"net/http/httptest"
"strings"
"github.com/kyma-incubator/compass/components/director/pkg/apperrors"
"github.com/kyma-incubator/compass/components/director/pkg/log"
"github.com/pkg/errors"
"github.com/tidwall/gjson"
)
// UnauthorizedMiddleware ensures that unauthorized responses are correctly propagated.
func UnauthorizedMiddleware() func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
recorder := httptest.NewRecorder()
next.ServeHTTP(recorder, r)
ctx := r.Context()
for key, values := range recorder.Header() {
for _, v := range values {
rw.Header().Add(key, v)
}
}
brokerResponseBody, err := ioutil.ReadAll(recorder.Body)
if err != nil {
log.C(ctx).Errorf("error while reading recorder body: %s", err.Error())
writeErrorResponse(ctx, rw, http.StatusInternalServerError, errors.New("internal server error"))
return
}
res := gjson.GetBytes(brokerResponseBody, "description")
if strings.Contains(res.Str, apperrors.InsufficientScopesMsg) {
log.C(ctx).Info("unauthorized request.. returning 401")
writeErrorResponse(ctx, rw, http.StatusUnauthorized, errors.New("unauthorized: insufficient scopes"))
return
}
rw.WriteHeader(recorder.Code)
if _, err := rw.Write(brokerResponseBody); err != nil {
log.C(ctx).Errorf("error while writing response body: %s", err.Error())
writeErrorResponse(ctx, rw, http.StatusInternalServerError, errors.New("internal server error"))
}
})
}
}
func writeErrorResponse(ctx context.Context, w http.ResponseWriter, statusResponse int, err error) {
w.Header().Set("Content-type", "application/json")
w.WriteHeader(statusResponse)
errorResp := struct {
Description string `json:"description"`
}{Description: err.Error()}
e := json.NewEncoder(w).Encode(errorResp)
if e != nil {
log.C(ctx).Errorf("encoding response error: %s, status: %d, response error: %s", e, statusResponse, errorResp)
}
}