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108 lines
3.4 KiB
Go
108 lines
3.4 KiB
Go
/**
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* Copyright 2015 Paul Querna
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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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*
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*/
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package cacheobject
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import (
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"fmt"
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"net/http"
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"time"
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)
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// Repersents an HTTP Warning: http://tools.ietf.org/html/rfc7234#section-5.5
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type Warning int
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const (
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// Response is Stale
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// A cache SHOULD generate this whenever the sent response is stale.
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WarningResponseIsStale Warning = 110
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// Revalidation Failed
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// A cache SHOULD generate this when sending a stale
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// response because an attempt to validate the response failed, due to an
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// inability to reach the server.
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WarningRevalidationFailed Warning = 111
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// Disconnected Operation
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// A cache SHOULD generate this if it is intentionally disconnected from
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// the rest of the network for a period of time.
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WarningDisconnectedOperation Warning = 112
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// Heuristic Expiration
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//
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// A cache SHOULD generate this if it heuristically chose a freshness
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// lifetime greater than 24 hours and the response's age is greater than
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// 24 hours.
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WarningHeuristicExpiration Warning = 113
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// Miscellaneous Warning
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//
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// The warning text can include arbitrary information to be presented to
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// a human user or logged. A system receiving this warning MUST NOT
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// take any automated action, besides presenting the warning to the
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// user.
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WarningMiscellaneousWarning Warning = 199
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// Transformation Applied
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//
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// This Warning code MUST be added by a proxy if it applies any
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// transformation to the representation, such as changing the
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// content-coding, media-type, or modifying the representation data,
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// unless this Warning code already appears in the response.
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WarningTransformationApplied Warning = 214
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// Miscellaneous Persistent Warning
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//
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// The warning text can include arbitrary information to be presented to
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// a human user or logged. A system receiving this warning MUST NOT
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// take any automated action.
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WarningMiscellaneousPersistentWarning Warning = 299
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)
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func (w Warning) HeaderString(agent string, date time.Time) string {
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if agent == "" {
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agent = "-"
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} else {
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// TODO(pquerna): this doesn't escape agent if it contains bad things.
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agent = `"` + agent + `"`
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}
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return fmt.Sprintf(`%d %s "%s" %s`, w, agent, w.String(), date.Format(http.TimeFormat))
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}
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func (w Warning) String() string {
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switch w {
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case WarningResponseIsStale:
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return "Response is Stale"
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case WarningRevalidationFailed:
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return "Revalidation Failed"
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case WarningDisconnectedOperation:
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return "Disconnected Operation"
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case WarningHeuristicExpiration:
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return "Heuristic Expiration"
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case WarningMiscellaneousWarning:
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// TODO(pquerna): ideally had a better way to override this one code.
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return "Miscellaneous Warning"
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case WarningTransformationApplied:
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return "Transformation Applied"
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case WarningMiscellaneousPersistentWarning:
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// TODO(pquerna): same as WarningMiscellaneousWarning
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return "Miscellaneous Persistent Warning"
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}
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panic(w)
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}
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