com.firefly.kotlin.ext.http.AsyncStaticFileHandler.kt Maven / Gradle / Ivy
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package com.firefly.kotlin.ext.http
import com.firefly.codec.http2.model.HttpHeader
import com.firefly.codec.http2.model.HttpStatus
import com.firefly.codec.http2.model.InclusiveByteRange
import com.firefly.codec.http2.model.MimeTypes
import com.firefly.kotlin.ext.nio.aRead
import com.firefly.server.http2.router.RoutingContext
import com.firefly.server.http2.router.handler.error.AbstractErrorResponseHandler
import com.firefly.server.http2.router.handler.error.DefaultErrorResponseHandlerLoader
import com.firefly.utils.CollectionUtils
import com.firefly.utils.StringUtils
import com.firefly.utils.io.BufferUtils
import java.nio.ByteBuffer
import java.nio.channels.AsynchronousFileChannel
import java.nio.file.Paths
import java.nio.file.StandardOpenOption
import java.util.*
import java.util.zip.GZIPOutputStream
/**
* @author Pengtao Qiu
*/
class AsyncStaticFileHandler(
val rootPath: String,
val maxBufferSize: Int = 64 * 1024,
val enableGzip: Boolean = false
) : AsyncHandler {
private val errorHandler: AbstractErrorResponseHandler = DefaultErrorResponseHandlerLoader.getInstance().handler
override suspend fun handle(ctx: RoutingContext) {
val path = ctx.uri.decodedPath
val fullPath = Paths.get(rootPath, path)
val file = fullPath.toFile()
if (file.exists() && file.isFile) {
// Parse the satisfiable ranges
val reqRanges = ctx.fields.getValuesList(HttpHeader.RANGE.asString())
val contentLength = file.length()
val ranges = InclusiveByteRange.satisfiableRanges(reqRanges, contentLength)
when {
CollectionUtils.isEmpty(reqRanges) -> { // no range
ctx.setStatus(HttpStatus.OK_200)
if (enableGzip) {
ctx.put(HttpHeader.CONTENT_ENCODING, "gzip")
} else {
ctx.put(HttpHeader.CONTENT_LENGTH, contentLength.toString())
}
Optional.ofNullable(MimeTypes.getDefaultMimeByExtension(file.name))
.filter(StringUtils::hasText)
.ifPresent { ctx.put(HttpHeader.CONTENT_TYPE, it) }
val bufSize = when {
contentLength > maxBufferSize -> maxBufferSize
else -> contentLength.toInt()
}
val outputStream = if (enableGzip) {
GZIPOutputStream(ctx.response.outputStream)
} else ctx.response.outputStream
outputStream.use { output ->
AsynchronousFileChannel.open(fullPath, StandardOpenOption.READ).use { channel ->
var totalBytesRead = 0L
while (totalBytesRead < contentLength) {
val buf = ByteBuffer.allocate(bufSize)
while (buf.hasRemaining() && totalBytesRead < contentLength) {
totalBytesRead += channel.aRead(buf, totalBytesRead)
}
buf.flip()
output.write(BufferUtils.toArray(buf))
}
}
}
}
!CollectionUtils.isEmpty(ranges) && ranges.size == 1 -> { // one range
val singleSatisfiableRange = ranges[0]
val singleLength = singleSatisfiableRange.getSize(contentLength)
ctx.setStatus(HttpStatus.PARTIAL_CONTENT_206)
ctx.put(HttpHeader.CONTENT_LENGTH, singleLength.toString())
ctx.put(HttpHeader.CONTENT_RANGE, singleSatisfiableRange.toHeaderRangeString(contentLength))
Optional.ofNullable(MimeTypes.getDefaultMimeByExtension(file.name))
.filter(StringUtils::hasText)
.ifPresent { ctx.put(HttpHeader.CONTENT_TYPE, it) }
val bufSize = when {
singleLength > maxBufferSize -> maxBufferSize
else -> singleLength.toInt()
}
AsynchronousFileChannel.open(fullPath).use {
var totalBytesRead = 0L
var position = singleSatisfiableRange.getFirst(contentLength)
var buf = ByteBuffer.allocate(bufSize)
while (true) {
val i = it.aRead(buf, position)
if (i < 0) {
break
}
totalBytesRead += i.toLong()
position += i.toLong()
buf.flip()
ctx.write(BufferUtils.toArray(buf))
if (totalBytesRead >= singleLength) {
break
}
buf = ByteBuffer.allocate(
Math.min(
maxBufferSize.toLong(),
singleLength - totalBytesRead
).toInt()
)
}
}
ctx.end()
}
else -> errorHandler.render(ctx, HttpStatus.RANGE_NOT_SATISFIABLE_416, null)
}
} else {
errorHandler.render(ctx, HttpStatus.NOT_FOUND_404, null)
}
}
}