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/*
* Copyright (C) 2012 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.
*/
@file:JvmName("HttpHeaders")
package okhttp3.internal.http
import java.io.EOFException
import java.net.HttpURLConnection.HTTP_NOT_MODIFIED
import java.net.HttpURLConnection.HTTP_NO_CONTENT
import java.util.Collections
import okhttp3.Challenge
import okhttp3.Cookie
import okhttp3.CookieJar
import okhttp3.Headers
import okhttp3.HttpUrl
import okhttp3.Response
import okhttp3.internal.headersContentLength
import okhttp3.internal.http.StatusLine.Companion.HTTP_CONTINUE
import okhttp3.internal.platform.Platform
import okhttp3.internal.skipAll
import okio.Buffer
import okio.ByteString.Companion.encodeUtf8
private val QUOTED_STRING_DELIMITERS = "\"\\".encodeUtf8()
private val TOKEN_DELIMITERS = "\t ,=".encodeUtf8()
/**
* Parse RFC 7235 challenges. This is awkward because we need to look ahead to know how to
* interpret a token.
*
* For example, the first line has a parameter name/value pair and the second line has a single
* token68:
*
* ```
* WWW-Authenticate: Digest foo=bar
* WWW-Authenticate: Digest foo=
* ```
*
* Similarly, the first line has one challenge and the second line has two challenges:
*
* ```
* WWW-Authenticate: Digest ,foo=bar
* WWW-Authenticate: Digest ,foo
* ```
*/
fun Headers.parseChallenges(headerName: String): List {
val result = mutableListOf()
for (h in 0 until size) {
if (headerName.equals(name(h), ignoreCase = true)) {
val header = Buffer().writeUtf8(value(h))
try {
header.readChallengeHeader(result)
} catch (e: EOFException) {
Platform.get().log("Unable to parse challenge", Platform.WARN, e)
}
}
}
return result
}
@Throws(EOFException::class)
private fun Buffer.readChallengeHeader(result: MutableList) {
var peek: String? = null
while (true) {
// Read a scheme name for this challenge if we don't have one already.
if (peek == null) {
skipCommasAndWhitespace()
peek = readToken()
if (peek == null) return
}
val schemeName = peek
// Read a token68, a sequence of parameters, or nothing.
val commaPrefixed = skipCommasAndWhitespace()
peek = readToken()
if (peek == null) {
if (!exhausted()) return // Expected a token; got something else.
result.add(Challenge(schemeName, emptyMap()))
return
}
var eqCount = skipAll('='.code.toByte())
val commaSuffixed = skipCommasAndWhitespace()
// It's a token68 because there isn't a value after it.
if (!commaPrefixed && (commaSuffixed || exhausted())) {
result.add(Challenge(schemeName,
Collections.singletonMap(null, peek + "=".repeat(eqCount))))
peek = null
continue
}
// It's a series of parameter names and values.
val parameters = mutableMapOf()
eqCount += skipAll('='.code.toByte())
while (true) {
if (peek == null) {
peek = readToken()
if (skipCommasAndWhitespace()) break // We peeked a scheme name followed by ','.
eqCount = skipAll('='.code.toByte())
}
if (eqCount == 0) break // We peeked a scheme name.
if (eqCount > 1) return // Unexpected '=' characters.
if (skipCommasAndWhitespace()) return // Unexpected ','.
val parameterValue = when {
startsWith('"'.code.toByte()) -> readQuotedString()
else -> readToken()
} ?: return // Expected a value.
val replaced = parameters.put(peek, parameterValue)
peek = null
if (replaced != null) return // Unexpected duplicate parameter.
if (!skipCommasAndWhitespace() && !exhausted()) return // Expected ',' or EOF.
}
result.add(Challenge(schemeName, parameters))
}
}
/** Returns true if any commas were skipped. */
private fun Buffer.skipCommasAndWhitespace(): Boolean {
var commaFound = false
loop@ while (!exhausted()) {
when (this[0]) {
','.code.toByte() -> {
// Consume ','.
readByte()
commaFound = true
}
' '.code.toByte(), '\t'.code.toByte() -> {
readByte()
// Consume space or tab.
}
else -> break@loop
}
}
return commaFound
}
private fun Buffer.startsWith(prefix: Byte): Boolean = !exhausted() && this[0] == prefix
/**
* Reads a double-quoted string, unescaping quoted pairs like `\"` to the 2nd character in each
* sequence. Returns the unescaped string, or null if the buffer isn't prefixed with a
* double-quoted string.
*/
@Throws(EOFException::class)
private fun Buffer.readQuotedString(): String? {
require(readByte() == '\"'.code.toByte())
val result = Buffer()
while (true) {
val i = indexOfElement(QUOTED_STRING_DELIMITERS)
if (i == -1L) return null // Unterminated quoted string.
if (this[i] == '"'.code.toByte()) {
result.write(this, i)
// Consume '"'.
readByte()
return result.readUtf8()
}
if (size == i + 1L) return null // Dangling escape.
result.write(this, i)
// Consume '\'.
readByte()
result.write(this, 1L) // The escaped character.
}
}
/**
* Consumes and returns a non-empty token, terminating at special characters in
* [TOKEN_DELIMITERS]. Returns null if the buffer is empty or prefixed with a delimiter.
*/
private fun Buffer.readToken(): String? {
var tokenSize = indexOfElement(TOKEN_DELIMITERS)
if (tokenSize == -1L) tokenSize = size
return when {
tokenSize != 0L -> readUtf8(tokenSize)
else -> null
}
}
fun CookieJar.receiveHeaders(url: HttpUrl, headers: Headers) {
if (this === CookieJar.NO_COOKIES) return
val cookies = Cookie.parseAll(url, headers)
if (cookies.isEmpty()) return
saveFromResponse(url, cookies)
}
/**
* Returns true if the response headers and status indicate that this response has a (possibly
* 0-length) body. See RFC 7231.
*/
fun Response.promisesBody(): Boolean {
// HEAD requests never yield a body regardless of the response headers.
if (request.method == "HEAD") {
return false
}
val responseCode = code
if ((responseCode < HTTP_CONTINUE || responseCode >= 200) &&
responseCode != HTTP_NO_CONTENT &&
responseCode != HTTP_NOT_MODIFIED) {
return true
}
// If the Content-Length or Transfer-Encoding headers disagree with the response code, the
// response is malformed. For best compatibility, we honor the headers.
if (headersContentLength() != -1L ||
"chunked".equals(header("Transfer-Encoding"), ignoreCase = true)) {
return true
}
return false
}
@Deprecated(
message = "No longer supported",
level = DeprecationLevel.ERROR,
replaceWith = ReplaceWith(expression = "response.promisesBody()"))
fun hasBody(response: Response): Boolean {
return response.promisesBody()
}
