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// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 baggage
const (
defaultMaxValueLength = 2048
)
// Restriction determines whether a baggage key is allowed and contains any restrictions on the baggage value.
type Restriction struct {
keyAllowed bool
maxValueLength int
}
// NewRestriction returns a new Restriction.
func NewRestriction(keyAllowed bool, maxValueLength int) *Restriction {
return &Restriction{
keyAllowed: keyAllowed,
maxValueLength: maxValueLength,
}
}
// KeyAllowed returns whether the baggage key for this restriction is allowed.
func (r *Restriction) KeyAllowed() bool {
return r.keyAllowed
}
// MaxValueLength returns the max length for the baggage value.
func (r *Restriction) MaxValueLength() int {
return r.maxValueLength
}
// RestrictionManager keeps track of valid baggage keys and their restrictions. The manager
// will return a Restriction for a specific baggage key which will determine whether the baggage
// key is allowed for the current service and any other applicable restrictions on the baggage
// value.
type RestrictionManager interface {
GetRestriction(service, key string) *Restriction
}
// DefaultRestrictionManager allows any baggage key.
type DefaultRestrictionManager struct {
defaultRestriction *Restriction
}
// NewDefaultRestrictionManager returns a DefaultRestrictionManager.
func NewDefaultRestrictionManager(maxValueLength int) *DefaultRestrictionManager {
if maxValueLength == 0 {
maxValueLength = defaultMaxValueLength
}
return &DefaultRestrictionManager{
defaultRestriction: &Restriction{keyAllowed: true, maxValueLength: maxValueLength},
}
}
// GetRestriction implements RestrictionManager#GetRestriction.
func (m *DefaultRestrictionManager) GetRestriction(service, key string) *Restriction {
return m.defaultRestriction
}
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