72 lines
2.3 KiB
Go
72 lines
2.3 KiB
Go
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// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package baggage
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const (
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defaultMaxValueLength = 2048
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)
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// Restriction determines whether a baggage key is allowed and contains any restrictions on the baggage value.
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type Restriction struct {
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keyAllowed bool
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maxValueLength int
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}
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// NewRestriction returns a new Restriction.
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func NewRestriction(keyAllowed bool, maxValueLength int) *Restriction {
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return &Restriction{
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keyAllowed: keyAllowed,
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maxValueLength: maxValueLength,
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}
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}
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// KeyAllowed returns whether the baggage key for this restriction is allowed.
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func (r *Restriction) KeyAllowed() bool {
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return r.keyAllowed
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}
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// MaxValueLength returns the max length for the baggage value.
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func (r *Restriction) MaxValueLength() int {
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return r.maxValueLength
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}
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// RestrictionManager keeps track of valid baggage keys and their restrictions. The manager
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// will return a Restriction for a specific baggage key which will determine whether the baggage
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// key is allowed for the current service and any other applicable restrictions on the baggage
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// value.
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type RestrictionManager interface {
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GetRestriction(service, key string) *Restriction
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}
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// DefaultRestrictionManager allows any baggage key.
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type DefaultRestrictionManager struct {
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defaultRestriction *Restriction
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}
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// NewDefaultRestrictionManager returns a DefaultRestrictionManager.
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func NewDefaultRestrictionManager(maxValueLength int) *DefaultRestrictionManager {
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if maxValueLength == 0 {
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maxValueLength = defaultMaxValueLength
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}
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return &DefaultRestrictionManager{
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defaultRestriction: &Restriction{keyAllowed: true, maxValueLength: maxValueLength},
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}
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}
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// GetRestriction implements RestrictionManager#GetRestriction.
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func (m *DefaultRestrictionManager) GetRestriction(service, key string) *Restriction {
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return m.defaultRestriction
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}
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