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authorization.go
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authorization.go
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/*
* Copyright 2018 The Service Manager Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package middlewares
import (
"fmt"
"github.com/Peripli/service-manager/pkg/log"
"github.com/Peripli/service-manager/pkg/security/http"
"github.com/Peripli/service-manager/pkg/web"
)
// Authorization type represents an authorization middleware
type Authorization struct {
Authorizer http.Authorizer
}
// Run represents the authorization middleware function that delegates the authorization
// to the provided authorizer
func (m *Authorization) Run(request *web.Request, next web.Handler) (*web.Response, error) {
ctx := request.Context()
if web.IsAuthorized(ctx) {
return next.Handle(request)
}
decision, accessLevel, err := m.Authorizer.Authorize(request)
if err != nil {
if decision == http.Deny {
log.C(ctx).Debug(err)
request.Request = request.WithContext(web.ContextWithAuthorizationError(ctx, err))
return next.Handle(request)
}
return nil, err
}
if decision == http.Allow {
userContext, found := web.UserFromContext(ctx)
if !found {
return nil, fmt.Errorf("authorization failed due to missing user context")
}
userContext.AccessLevel = accessLevel
request.Request = request.WithContext(web.ContextWithUser(ctx, userContext))
if accessLevel == web.NoAccess {
return nil, fmt.Errorf("authorization failed due to missing access level. Authorizer that allows access should also specify the access level")
}
if !web.IsAuthorized(ctx) {
request.Request = request.WithContext(web.ContextWithAuthorization(ctx))
}
}
return next.Handle(request)
}