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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.internal.http
import java.text.DateFormat
import java.text.ParsePosition
import java.text.SimpleDateFormat
import java.util.Date
import java.util.Locale
import okhttp3.internal.UTC
/** The last four-digit year: "Fri, 31 Dec 9999 23:59:59 GMT". */
internal const val MAX_DATE = 253402300799999L
/**
* Most websites serve cookies in the blessed format. Eagerly create the parser to ensure such
* cookies are on the fast path.
*/
private val STANDARD_DATE_FORMAT = object : ThreadLocal() {
override fun initialValue(): DateFormat {
// Date format specified by RFC 7231 section 7.1.1.1.
return SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss 'GMT'", Locale.US).apply {
isLenient = false
timeZone = UTC
}
}
}
/** If we fail to parse a date in a non-standard format, try each of these formats in sequence. */
private val BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS = arrayOf(
// HTTP formats required by RFC2616 but with any timezone.
"EEE, dd MMM yyyy HH:mm:ss zzz", // RFC 822, updated by RFC 1123 with any TZ
"EEEE, dd-MMM-yy HH:mm:ss zzz", // RFC 850, obsoleted by RFC 1036 with any TZ.
"EEE MMM d HH:mm:ss yyyy", // ANSI C's asctime() format
// Alternative formats.
"EEE, dd-MMM-yyyy HH:mm:ss z",
"EEE, dd-MMM-yyyy HH-mm-ss z",
"EEE, dd MMM yy HH:mm:ss z",
"EEE dd-MMM-yyyy HH:mm:ss z",
"EEE dd MMM yyyy HH:mm:ss z",
"EEE dd-MMM-yyyy HH-mm-ss z",
"EEE dd-MMM-yy HH:mm:ss z",
"EEE dd MMM yy HH:mm:ss z",
"EEE,dd-MMM-yy HH:mm:ss z",
"EEE,dd-MMM-yyyy HH:mm:ss z",
"EEE, dd-MM-yyyy HH:mm:ss z",
/* RI bug 6641315 claims a cookie of this format was once served by www.yahoo.com */
"EEE MMM d yyyy HH:mm:ss z"
)
private val BROWSER_COMPATIBLE_DATE_FORMATS =
arrayOfNulls(BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS.size)
/** Returns the date for this string, or null if the value couldn't be parsed. */
internal fun String.toHttpDateOrNull(): Date? {
if (isEmpty()) return null
val position = ParsePosition(0)
var result = STANDARD_DATE_FORMAT.get().parse(this, position)
if (position.index == length) {
// STANDARD_DATE_FORMAT must match exactly; all text must be consumed, e.g. no ignored
// non-standard trailing "+01:00". Those cases are covered below.
return result
}
synchronized(BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS) {
for (i in 0 until BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS.size) {
var format: DateFormat? = BROWSER_COMPATIBLE_DATE_FORMATS[i]
if (format == null) {
format = SimpleDateFormat(BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS[i], Locale.US).apply {
// Set the timezone to use when interpreting formats that don't have a timezone. GMT is
// specified by RFC 7231.
timeZone = UTC
}
BROWSER_COMPATIBLE_DATE_FORMATS[i] = format
}
position.index = 0
result = format.parse(this, position)
if (position.index != 0) {
// Something was parsed. It's possible the entire string was not consumed but we ignore
// that. If any of the BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS ended in "'GMT'" we'd have
// to also check that position.getIndex() == value.length() otherwise parsing might have
// terminated early, ignoring things like "+01:00". Leaving this as != 0 means that any
// trailing junk is ignored.
return result
}
}
}
return null
}
/** Returns the string for this date. */
internal fun Date.toHttpDateString(): String = STANDARD_DATE_FORMAT.get().format(this)
