75 lines
2.6 KiB
Go
75 lines
2.6 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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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.
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type RestrictionManager interface {
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GetRestriction(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(key string) *Restriction {
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return m.defaultRestriction
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}
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