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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 java.util.concurrent.TimeUnit
import kotlin.time.Duration
import okhttp3.internal.commonBuild
import okhttp3.internal.commonClampToInt
import okhttp3.internal.commonForceCache
import okhttp3.internal.commonForceNetwork
import okhttp3.internal.commonImmutable
import okhttp3.internal.commonNoCache
import okhttp3.internal.commonNoStore
import okhttp3.internal.commonNoTransform
import okhttp3.internal.commonOnlyIfCached
import okhttp3.internal.commonParse
import okhttp3.internal.commonToString
/**
* 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).
*/
class CacheControl internal constructor(
/**
* 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.
*/
@get:JvmName("noCache") val noCache: Boolean,
/** If true, this response should not be cached. */
@get:JvmName("noStore") val noStore: Boolean,
/** The duration past the response's served date that it can be served without validation. */
@get:JvmName("maxAgeSeconds") 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.
*/
@get:JvmName("sMaxAgeSeconds") val sMaxAgeSeconds: Int,
val isPrivate: Boolean,
val isPublic: Boolean,
@get:JvmName("mustRevalidate") val mustRevalidate: Boolean,
@get:JvmName("maxStaleSeconds") val maxStaleSeconds: Int,
@get:JvmName("minFreshSeconds") 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.
*/
@get:JvmName("onlyIfCached") val onlyIfCached: Boolean,
@get:JvmName("noTransform") val noTransform: Boolean,
@get:JvmName("immutable") val immutable: Boolean,
internal var headerValue: String?,
) {
@JvmName("-deprecated_noCache")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "noCache"),
level = DeprecationLevel.ERROR,
)
fun noCache(): Boolean = noCache
@JvmName("-deprecated_noStore")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "noStore"),
level = DeprecationLevel.ERROR,
)
fun noStore(): Boolean = noStore
@JvmName("-deprecated_maxAgeSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "maxAgeSeconds"),
level = DeprecationLevel.ERROR,
)
fun maxAgeSeconds(): Int = maxAgeSeconds
@JvmName("-deprecated_sMaxAgeSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "sMaxAgeSeconds"),
level = DeprecationLevel.ERROR,
)
fun sMaxAgeSeconds(): Int = sMaxAgeSeconds
@JvmName("-deprecated_mustRevalidate")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "mustRevalidate"),
level = DeprecationLevel.ERROR,
)
fun mustRevalidate(): Boolean = mustRevalidate
@JvmName("-deprecated_maxStaleSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "maxStaleSeconds"),
level = DeprecationLevel.ERROR,
)
fun maxStaleSeconds(): Int = maxStaleSeconds
@JvmName("-deprecated_minFreshSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "minFreshSeconds"),
level = DeprecationLevel.ERROR,
)
fun minFreshSeconds(): Int = minFreshSeconds
@JvmName("-deprecated_onlyIfCached")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "onlyIfCached"),
level = DeprecationLevel.ERROR,
)
fun onlyIfCached(): Boolean = onlyIfCached
@JvmName("-deprecated_noTransform")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "noTransform"),
level = DeprecationLevel.ERROR,
)
fun noTransform(): Boolean = noTransform
@JvmName("-deprecated_immutable")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "immutable"),
level = DeprecationLevel.ERROR,
)
fun immutable(): Boolean = immutable
override fun toString(): String = commonToString()
/** Builds a `Cache-Control` request header. */
class Builder {
internal var noCache: Boolean = false
internal var noStore: Boolean = false
internal var maxAgeSeconds = -1
internal var maxStaleSeconds = -1
internal var minFreshSeconds = -1
internal var onlyIfCached: Boolean = false
internal var noTransform: Boolean = false
internal var immutable: Boolean = false
/** Don't accept an unvalidated cached response. */
fun noCache() = commonNoCache()
/** Don't store the server's response in any cache. */
fun noStore() = commonNoStore()
/**
* 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() = commonOnlyIfCached()
/** Don't accept a transformed response. */
fun noTransform() = commonNoTransform()
fun immutable() = commonImmutable()
/**
* 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 duration. This is stored and transmitted with [TimeUnit.SECONDS]
* precision; finer precision will be lost.
*/
fun maxAge(maxAge: Duration) =
apply {
val maxAgeSeconds = maxAge.inWholeSeconds
require(maxAgeSeconds >= 0) { "maxAge < 0: $maxAgeSeconds" }
this.maxAgeSeconds = maxAgeSeconds.commonClampToInt()
}
fun maxStale(maxStale: Duration) =
apply {
val maxStaleSeconds = maxStale.inWholeSeconds
require(maxStaleSeconds >= 0) { "maxStale < 0: $maxStaleSeconds" }
this.maxStaleSeconds = maxStaleSeconds.commonClampToInt()
}
fun minFresh(minFresh: Duration) =
apply {
val minFreshSeconds = minFresh.inWholeSeconds
require(minFreshSeconds >= 0) { "minFresh < 0: $minFreshSeconds" }
this.minFreshSeconds = minFreshSeconds.commonClampToInt()
}
/**
* 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: TimeUnit,
) = apply {
require(maxAge >= 0) { "maxAge < 0: $maxAge" }
val maxAgeSecondsLong = timeUnit.toSeconds(maxAge.toLong())
this.maxAgeSeconds = maxAgeSecondsLong.commonClampToInt()
}
/**
* 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: TimeUnit,
) = apply {
require(maxStale >= 0) { "maxStale < 0: $maxStale" }
val maxStaleSecondsLong = timeUnit.toSeconds(maxStale.toLong())
this.maxStaleSeconds = maxStaleSecondsLong.commonClampToInt()
}
/**
* 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: TimeUnit,
) = apply {
require(minFresh >= 0) { "minFresh < 0: $minFresh" }
val minFreshSecondsLong = timeUnit.toSeconds(minFresh.toLong())
this.minFreshSeconds = minFreshSecondsLong.commonClampToInt()
}
fun build(): CacheControl = commonBuild()
}
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.
*/
@JvmField
val FORCE_NETWORK = commonForceNetwork()
/**
* 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`.
*/
@JvmField
val FORCE_CACHE = commonForceCache()
/**
* Returns the cache directives of [headers]. This honors both Cache-Control and Pragma headers
* if they are present.
*/
@JvmStatic
fun parse(headers: Headers): CacheControl = commonParse(headers)
}
}
