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auth_aware_handler.go
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auth_aware_handler.go
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package handlers
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"code.cloudfoundry.org/korifi/api/apierrors"
"code.cloudfoundry.org/korifi/api/authorization"
"code.cloudfoundry.org/korifi/api/correlation"
"code.cloudfoundry.org/korifi/api/presenter"
"github.com/go-http-utils/headers"
"github.com/go-logr/logr"
)
type HandlerResponse struct {
httpStatus int
body interface{}
headers map[string]string
}
func NewHandlerResponse(httpStatus int) *HandlerResponse {
return &HandlerResponse{
httpStatus: httpStatus,
headers: map[string]string{},
}
}
func (r *HandlerResponse) WithHeader(key, value string) *HandlerResponse {
r.headers[key] = value
return r
}
func (r *HandlerResponse) WithBody(body interface{}) *HandlerResponse {
r.body = body
return r
}
//counterfeiter:generate -o fake -fake-name AuthAwareHandlerFunc . AuthAwareHandlerFunc
type AuthAwareHandlerFunc func(ctx context.Context, logger logr.Logger, authInfo authorization.Info, r *http.Request) (*HandlerResponse, error)
type AuthInfoProvider func(ctx context.Context) (authorization.Info, bool)
type AuthAwareHandlerFuncWrapper struct {
logger logr.Logger
authInfoProvider AuthInfoProvider
}
func NewAuthAwareHandlerFuncWrapper(logger logr.Logger) *AuthAwareHandlerFuncWrapper {
return &AuthAwareHandlerFuncWrapper{
logger: logger,
authInfoProvider: authorization.InfoFromContext,
}
}
func NewUnauthenticatedHandlerFuncWrapper(logger logr.Logger) *AuthAwareHandlerFuncWrapper {
return &AuthAwareHandlerFuncWrapper{
logger: logger,
authInfoProvider: func(ctx context.Context) (authorization.Info, bool) {
return authorization.Info{}, true
},
}
}
func (h *AuthAwareHandlerFuncWrapper) Wrap(delegate AuthAwareHandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
logger := correlation.AddCorrelationIDToLogger(ctx, h.logger)
authInfo, ok := h.authInfoProvider(r.Context())
if !ok {
logger.Error(nil, "unable to get auth info")
presentError(h.logger, w, nil)
return
}
handlerResponse, err := delegate(ctx, logger, authInfo, r)
if err != nil {
logger.Info("handler returned error", "error", err)
presentError(h.logger, w, err)
return
}
if err := handlerResponse.writeTo(w); err != nil {
_ = apierrors.LogAndReturn(logger, err, "failed to write result to the HTTP response", "handlerResponse", handlerResponse, "method", r.Method, "URL", r.URL)
}
}
}
func presentError(logger logr.Logger, w http.ResponseWriter, err error) {
var apiError apierrors.ApiError
if errors.As(err, &apiError) {
writeErr := NewHandlerResponse(apiError.HttpStatus()).
WithBody(presenter.ErrorsResponse{
Errors: []presenter.PresentedError{
{
Detail: apiError.Detail(),
Title: apiError.Title(),
Code: apiError.Code(),
},
},
}).
writeTo(w)
if writeErr != nil {
_ = apierrors.LogAndReturn(logger, writeErr, "failed to write error to the HTTP response")
}
return
}
presentError(logger, w, apierrors.NewUnknownError(err))
}
func (response *HandlerResponse) writeTo(w http.ResponseWriter) error {
for k, v := range response.headers {
w.Header().Set(k, v)
}
if response.body == nil {
w.WriteHeader(response.httpStatus)
return nil
}
w.Header().Set(headers.ContentType, "application/json")
w.WriteHeader(response.httpStatus)
encoder := json.NewEncoder(w)
encoder.SetEscapeHTML(false)
err := encoder.Encode(response.body)
if err != nil {
return fmt.Errorf("failed to encode and write response: %w", err)
}
return nil
}