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middleware.go
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middleware.go
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package policy
import (
"encoding/json"
"fmt"
"net/http"
"github.com/pkg/errors"
"github.com/replicatedhq/kots/pkg/logger"
"github.com/replicatedhq/kots/pkg/rbac"
rbactypes "github.com/replicatedhq/kots/pkg/rbac/types"
"github.com/replicatedhq/kots/pkg/session"
"github.com/replicatedhq/kots/pkg/store"
)
type RBACError struct {
Resource string
}
func NewRBACError(resource string) *RBACError {
return &RBACError{Resource: resource}
}
func (e RBACError) Abort(w http.ResponseWriter) error {
err := fmt.Errorf("access denied to resource %s", e.Resource)
response := ErrorResponse{Error: err.Error()}
JSON(w, http.StatusForbidden, response)
return err
}
type Middleware struct {
KOTSStore store.Store
Roles []rbactypes.Role
}
func NewMiddleware(kotsStore store.Store, roles []rbactypes.Role) *Middleware {
return &Middleware{
KOTSStore: kotsStore,
Roles: roles,
}
}
func (m *Middleware) EnforceAccess(p *Policy, handler http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
sess := session.ContextGetSession(r)
if sess == nil {
logger.Error(errors.New("session empty"))
w.WriteHeader(http.StatusForbidden)
return
}
if sess.HasRBAC { // handle pre-rbac sessions
action, resource, err := p.execute(r, m.KOTSStore)
if err != nil {
logger.Error(errors.Wrapf(err, "failed to execute policy template %q", p.resource))
w.WriteHeader(http.StatusInternalServerError)
return
}
rbacErr := NewRBACError(resource)
allow, err := rbac.CheckAccess(r.Context(), m.Roles, action, resource, sess.Roles)
if err != nil {
logger.Error(errors.Wrapf(err, "failed to check access to resource %q", resource))
w.WriteHeader(http.StatusInternalServerError)
return
}
if !allow {
logger.Error(rbacErr.Abort(w))
return
}
}
handler(w, r)
}
}
// TODO: move everything below here to a shared package
type ErrorResponse struct {
Error string `json:"error"`
Success bool `json:"success"` // NOTE: the frontend relies on this for some routes
Err error `json:"-"`
}
func NewErrorResponse(err error) ErrorResponse {
return ErrorResponse{
Error: errors.Cause(err).Error(),
Success: false,
Err: err,
}
}
func JSON(w http.ResponseWriter, code int, payload interface{}) {
response, err := json.Marshal(payload)
if err != nil {
logger.Error(err)
w.WriteHeader(500)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
w.Write(response)
}