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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 okhttp3.internal.indexOfNonWhitespace
import okhttp3.internal.toNonNegativeInt
import java.util.concurrent.TimeUnit
/**
* 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 private 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,
private var headerValue: String?
) {
@JvmName("-deprecated_noCache")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "noCache"),
level = DeprecationLevel.ERROR)
fun noCache() = noCache
@JvmName("-deprecated_noStore")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "noStore"),
level = DeprecationLevel.ERROR)
fun noStore() = noStore
@JvmName("-deprecated_maxAgeSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "maxAgeSeconds"),
level = DeprecationLevel.ERROR)
fun maxAgeSeconds() = maxAgeSeconds
@JvmName("-deprecated_sMaxAgeSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "sMaxAgeSeconds"),
level = DeprecationLevel.ERROR)
fun sMaxAgeSeconds() = sMaxAgeSeconds
@JvmName("-deprecated_mustRevalidate")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "mustRevalidate"),
level = DeprecationLevel.ERROR)
fun mustRevalidate() = mustRevalidate
@JvmName("-deprecated_maxStaleSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "maxStaleSeconds"),
level = DeprecationLevel.ERROR)
fun maxStaleSeconds() = maxStaleSeconds
@JvmName("-deprecated_minFreshSeconds")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "minFreshSeconds"),
level = DeprecationLevel.ERROR)
fun minFreshSeconds() = minFreshSeconds
@JvmName("-deprecated_onlyIfCached")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "onlyIfCached"),
level = DeprecationLevel.ERROR)
fun onlyIfCached() = onlyIfCached
@JvmName("-deprecated_noTransform")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "noTransform"),
level = DeprecationLevel.ERROR)
fun noTransform() = noTransform
@JvmName("-deprecated_immutable")
@Deprecated(
message = "moved to val",
replaceWith = ReplaceWith(expression = "immutable"),
level = DeprecationLevel.ERROR)
fun immutable() = immutable
override fun toString(): String {
var result = headerValue
if (result == null) {
result = buildString {
if (noCache) append("no-cache, ")
if (noStore) append("no-store, ")
if (maxAgeSeconds != -1) append("max-age=").append(maxAgeSeconds).append(", ")
if (sMaxAgeSeconds != -1) append("s-maxage=").append(sMaxAgeSeconds).append(", ")
if (isPrivate) append("private, ")
if (isPublic) append("public, ")
if (mustRevalidate) append("must-revalidate, ")
if (maxStaleSeconds != -1) append("max-stale=").append(maxStaleSeconds).append(", ")
if (minFreshSeconds != -1) append("min-fresh=").append(minFreshSeconds).append(", ")
if (onlyIfCached) append("only-if-cached, ")
if (noTransform) append("no-transform, ")
if (immutable) append("immutable, ")
if (isEmpty()) return ""
delete(length - 2, length)
}
headerValue = result
}
return result
}
/** Builds a `Cache-Control` request header. */
class Builder {
private var noCache: Boolean = false
private var noStore: Boolean = false
private var maxAgeSeconds = -1
private var maxStaleSeconds = -1
private var minFreshSeconds = -1
private var onlyIfCached: Boolean = false
private var noTransform: Boolean = false
private var immutable: Boolean = false
/** Don't accept an unvalidated cached response. */
fun noCache() = apply {
this.noCache = true
}
/** Don't store the server's response in any cache. */
fun noStore() = apply {
this.noStore = true
}
/**
* 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.clampToInt()
}
/**
* 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.clampToInt()
}
/**
* 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.clampToInt()
}
/**
* 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() = apply {
this.onlyIfCached = true
}
/** Don't accept a transformed response. */
fun noTransform() = apply {
this.noTransform = true
}
fun immutable() = apply {
this.immutable = true
}
private fun Long.clampToInt(): Int {
return when {
this > Integer.MAX_VALUE -> Integer.MAX_VALUE
else -> toInt()
}
}
fun build(): CacheControl {
return CacheControl(noCache, noStore, maxAgeSeconds, -1, false, false, false, maxStaleSeconds,
minFreshSeconds, onlyIfCached, noTransform, immutable, null)
}
}
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 = Builder()
.noCache()
.build()
/**
* 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 = Builder()
.onlyIfCached()
.maxStale(Integer.MAX_VALUE, TimeUnit.SECONDS)
.build()
/**
* Returns the cache directives of [headers]. This honors both Cache-Control and Pragma headers
* if they are present.
*/
@JvmStatic
fun parse(headers: Headers): CacheControl {
var noCache = false
var noStore = false
var maxAgeSeconds = -1
var sMaxAgeSeconds = -1
var isPrivate = false
var isPublic = false
var mustRevalidate = false
var maxStaleSeconds = -1
var minFreshSeconds = -1
var onlyIfCached = false
var noTransform = false
var immutable = false
var canUseHeaderValue = true
var headerValue: String? = null
loop@ for (i in 0 until headers.size) {
val name = headers.name(i)
val value = headers.value(i)
when {
name.equals("Cache-Control", ignoreCase = true) -> {
if (headerValue != null) {
// Multiple cache-control headers means we can't use the raw value.
canUseHeaderValue = false
} else {
headerValue = value
}
}
name.equals("Pragma", ignoreCase = true) -> {
// Might specify additional cache-control params. We invalidate just in case.
canUseHeaderValue = false
}
else -> {
continue@loop
}
}
var pos = 0
while (pos < value.length) {
val tokenStart = pos
pos = value.indexOfElement("=,;", pos)
val directive = value.substring(tokenStart, pos).trim()
val parameter: String?
if (pos == value.length || value[pos] == ',' || value[pos] == ';') {
pos++ // Consume ',' or ';' (if necessary).
parameter = null
} else {
pos++ // Consume '='.
pos = value.indexOfNonWhitespace(pos)
if (pos < value.length && value[pos] == '\"') {
// Quoted string.
pos++ // Consume '"' open quote.
val parameterStart = pos
pos = value.indexOf('"', pos)
parameter = value.substring(parameterStart, pos)
pos++ // Consume '"' close quote (if necessary).
} else {
// Unquoted string.
val parameterStart = pos
pos = value.indexOfElement(",;", pos)
parameter = value.substring(parameterStart, pos).trim()
}
}
when {
"no-cache".equals(directive, ignoreCase = true) -> {
noCache = true
}
"no-store".equals(directive, ignoreCase = true) -> {
noStore = true
}
"max-age".equals(directive, ignoreCase = true) -> {
maxAgeSeconds = parameter.toNonNegativeInt(-1)
}
"s-maxage".equals(directive, ignoreCase = true) -> {
sMaxAgeSeconds = parameter.toNonNegativeInt(-1)
}
"private".equals(directive, ignoreCase = true) -> {
isPrivate = true
}
"public".equals(directive, ignoreCase = true) -> {
isPublic = true
}
"must-revalidate".equals(directive, ignoreCase = true) -> {
mustRevalidate = true
}
"max-stale".equals(directive, ignoreCase = true) -> {
maxStaleSeconds = parameter.toNonNegativeInt(Integer.MAX_VALUE)
}
"min-fresh".equals(directive, ignoreCase = true) -> {
minFreshSeconds = parameter.toNonNegativeInt(-1)
}
"only-if-cached".equals(directive, ignoreCase = true) -> {
onlyIfCached = true
}
"no-transform".equals(directive, ignoreCase = true) -> {
noTransform = true
}
"immutable".equals(directive, ignoreCase = true) -> {
immutable = true
}
}
}
}
if (!canUseHeaderValue) {
headerValue = null
}
return CacheControl(noCache, noStore, maxAgeSeconds, sMaxAgeSeconds, isPrivate, isPublic,
mustRevalidate, maxStaleSeconds, minFreshSeconds, onlyIfCached, noTransform, immutable,
headerValue)
}
/**
* Returns the next index in this at or after [startIndex] that is a character from
* [characters]. Returns the input length if none of the requested characters can be found.
*/
private fun String.indexOfElement(characters: String, startIndex: Int = 0): Int {
for (i in startIndex until length) {
if (this[i] in characters) {
return i
}
}
return length
}
}
}
