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/*
* Copyright (C) 2019 Square, 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 okhttp3
import kotlin.time.DurationUnit
/**
* A Cache-Control header with cache directives from a server or client. These directives set policy
* on what responses can be stored, and which requests can be satisfied by those stored responses.
*
* See [RFC 7234, 5.2](https://tools.ietf.org/html/rfc7234#section-5.2).
*/
expect class CacheControl internal constructor(
noCache: Boolean,
noStore: Boolean,
maxAgeSeconds: Int,
sMaxAgeSeconds: Int,
isPrivate: Boolean,
isPublic: Boolean,
mustRevalidate: Boolean,
maxStaleSeconds: Int,
minFreshSeconds: Int,
onlyIfCached: Boolean,
noTransform: Boolean,
immutable: Boolean,
headerValue: String?
) {
/**
* In a response, this field's name "no-cache" is misleading. It doesn't prevent us from caching
* the response; it only means we have to validate the response with the origin server before
* returning it. We can do this with a conditional GET.
*
* In a request, it means do not use a cache to satisfy the request.
*/
val noCache: Boolean
/** If true, this response should not be cached. */
val noStore: Boolean
/** The duration past the response's served date that it can be served without validation. */
val maxAgeSeconds: Int
/**
* The "s-maxage" directive is the max age for shared caches. Not to be confused with "max-age"
* for non-shared caches, As in Firefox and Chrome, this directive is not honored by this cache.
*/
val sMaxAgeSeconds: Int
val isPrivate: Boolean
val isPublic: Boolean
val mustRevalidate: Boolean
val maxStaleSeconds: Int
val minFreshSeconds: Int
/**
* This field's name "only-if-cached" is misleading. It actually means "do not use the network".
* It is set by a client who only wants to make a request if it can be fully satisfied by the
* cache. Cached responses that would require validation (ie. conditional gets) are not permitted
* if this header is set.
*/
val onlyIfCached: Boolean
val noTransform: Boolean
val immutable: Boolean
internal var headerValue: String?
override fun toString(): String
/** Builds a `Cache-Control` request header. */
class Builder constructor() {
internal var noCache: Boolean
internal var noStore: Boolean
internal var maxAgeSeconds: Int
internal var maxStaleSeconds: Int
internal var minFreshSeconds: Int
internal var onlyIfCached: Boolean
internal var noTransform: Boolean
internal var immutable: Boolean
/** Don't accept an unvalidated cached response. */
fun noCache(): Builder
/** Don't store the server's response in any cache. */
fun noStore(): Builder
/**
* Sets the maximum age of a cached response. If the cache response's age exceeds [maxAge], it
* will not be used and a network request will be made.
*
* @param maxAge a non-negative integer. This is stored and transmitted with [TimeUnit.SECONDS]
* precision; finer precision will be lost.
*/
fun maxAge(maxAge: Int, timeUnit: DurationUnit): Builder
/**
* Accept cached responses that have exceeded their freshness lifetime by up to `maxStale`. If
* unspecified, stale cache responses will not be used.
*
* @param maxStale a non-negative integer. This is stored and transmitted with
* [TimeUnit.SECONDS] precision; finer precision will be lost.
*/
fun maxStale(maxStale: Int, timeUnit: DurationUnit): Builder
/**
* Sets the minimum number of seconds that a response will continue to be fresh for. If the
* response will be stale when [minFresh] have elapsed, the cached response will not be used and
* a network request will be made.
*
* @param minFresh a non-negative integer. This is stored and transmitted with
* [TimeUnit.SECONDS] precision; finer precision will be lost.
*/
fun minFresh(minFresh: Int, timeUnit: DurationUnit): Builder
/**
* Only accept the response if it is in the cache. If the response isn't cached, a `504
* Unsatisfiable Request` response will be returned.
*/
fun onlyIfCached(): Builder
/** Don't accept a transformed response. */
fun noTransform(): Builder
fun immutable(): Builder
fun build(): CacheControl
}
companion object {
/**
* Cache control request directives that require network validation of responses. Note that such
* requests may be assisted by the cache via conditional GET requests.
*/
val FORCE_NETWORK: CacheControl
/**
* Cache control request directives that uses the cache only, even if the cached response is
* stale. If the response isn't available in the cache or requires server validation, the call
* will fail with a `504 Unsatisfiable Request`.
*/
val FORCE_CACHE: CacheControl
/**
* Returns the cache directives of [headers]. This honors both Cache-Control and Pragma headers
* if they are present.
*/
fun parse(headers: Headers): CacheControl
}
}
