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/*
* Copyright (C) 2013 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.internal.http2
import okhttp3.internal.format
import okio.ByteString.Companion.encodeUtf8
object Http2 {
@JvmField
val CONNECTION_PREFACE = "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n".encodeUtf8()
/** The initial max frame size, applied independently writing to, or reading from the peer. */
const val INITIAL_MAX_FRAME_SIZE = 0x4000 // 16384
const val TYPE_DATA = 0x0
const val TYPE_HEADERS = 0x1
const val TYPE_PRIORITY = 0x2
const val TYPE_RST_STREAM = 0x3
const val TYPE_SETTINGS = 0x4
const val TYPE_PUSH_PROMISE = 0x5
const val TYPE_PING = 0x6
const val TYPE_GOAWAY = 0x7
const val TYPE_WINDOW_UPDATE = 0x8
const val TYPE_CONTINUATION = 0x9
const val FLAG_NONE = 0x0
const val FLAG_ACK = 0x1 // Used for settings and ping.
const val FLAG_END_STREAM = 0x1 // Used for headers and data.
const val FLAG_END_HEADERS = 0x4 // Used for headers and continuation.
const val FLAG_END_PUSH_PROMISE = 0x4
const val FLAG_PADDED = 0x8 // Used for headers and data.
const val FLAG_PRIORITY = 0x20 // Used for headers.
const val FLAG_COMPRESSED = 0x20 // Used for data.
/** Lookup table for valid frame types. */
private val FRAME_NAMES = arrayOf(
"DATA", "HEADERS", "PRIORITY", "RST_STREAM", "SETTINGS", "PUSH_PROMISE", "PING", "GOAWAY",
"WINDOW_UPDATE", "CONTINUATION"
)
/**
* Lookup table for valid flags for DATA, HEADERS, CONTINUATION. Invalid combinations are
* represented in binary.
*/
private val FLAGS = arrayOfNulls(0x40) // Highest bit flag is 0x20.
private val BINARY = Array(256) {
format("%8s", Integer.toBinaryString(it)).replace(' ', '0')
}
init {
FLAGS[FLAG_NONE] = ""
FLAGS[FLAG_END_STREAM] = "END_STREAM"
val prefixFlags = intArrayOf(FLAG_END_STREAM)
FLAGS[FLAG_PADDED] = "PADDED"
for (prefixFlag in prefixFlags) {
FLAGS[prefixFlag or FLAG_PADDED] = FLAGS[prefixFlag] + "|PADDED"
}
FLAGS[FLAG_END_HEADERS] = "END_HEADERS" // Same as END_PUSH_PROMISE.
FLAGS[FLAG_PRIORITY] = "PRIORITY" // Same as FLAG_COMPRESSED.
FLAGS[FLAG_END_HEADERS or FLAG_PRIORITY] = "END_HEADERS|PRIORITY" // Only valid on HEADERS.
val frameFlags = intArrayOf(FLAG_END_HEADERS, FLAG_PRIORITY, FLAG_END_HEADERS or FLAG_PRIORITY)
for (frameFlag in frameFlags) {
for (prefixFlag in prefixFlags) {
FLAGS[prefixFlag or frameFlag] = FLAGS[prefixFlag] + '|'.toString() + FLAGS[frameFlag]
FLAGS[prefixFlag or frameFlag or FLAG_PADDED] =
FLAGS[prefixFlag] + '|'.toString() + FLAGS[frameFlag] + "|PADDED"
}
}
for (i in FLAGS.indices) { // Fill in holes with binary representation.
if (FLAGS[i] == null) FLAGS[i] = BINARY[i]
}
}
/**
* Returns human-readable representation of HTTP/2 frame headers.
*
* The format is:
*
* ```
* direction streamID length type flags
* ```
*
* Where direction is `<<` for inbound and `>>` for outbound.
*
* For example, the following would indicate a HEAD request sent from the client.
* ```
* `<< 0x0000000f 12 HEADERS END_HEADERS|END_STREAM
* ```
*/
fun frameLog(
inbound: Boolean,
streamId: Int,
length: Int,
type: Int,
flags: Int
): String {
val formattedType = formattedType(type)
val formattedFlags = formatFlags(type, flags)
val direction = if (inbound) "<<" else ">>"
return format("%s 0x%08x %5d %-13s %s",
direction, streamId, length, formattedType, formattedFlags)
}
internal fun formattedType(type: Int): String =
if (type < FRAME_NAMES.size) FRAME_NAMES[type] else format("0x%02x", type)
/**
* Looks up valid string representing flags from the table. Invalid combinations are represented
* in binary.
*/
// Visible for testing.
fun formatFlags(type: Int, flags: Int): String {
if (flags == 0) return ""
when (type) {
// Special case types that have 0 or 1 flag.
TYPE_SETTINGS, TYPE_PING -> return if (flags == FLAG_ACK) "ACK" else BINARY[flags]
TYPE_PRIORITY, TYPE_RST_STREAM, TYPE_GOAWAY, TYPE_WINDOW_UPDATE -> return BINARY[flags]
}
val result = if (flags < FLAGS.size) FLAGS[flags]!! else BINARY[flags]
// Special case types that have overlap flag values.
return when {
type == TYPE_PUSH_PROMISE && flags and FLAG_END_PUSH_PROMISE != 0 -> {
result.replace("HEADERS", "PUSH_PROMISE") // TODO: Avoid allocation.
}
type == TYPE_DATA && flags and FLAG_COMPRESSED != 0 -> {
result.replace("PRIORITY", "COMPRESSED") // TODO: Avoid allocation.
}
else -> result
}
}
}
