278 lines
10 KiB
Kotlin
278 lines
10 KiB
Kotlin
/* ktlint-disable no-wildcard-imports */
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package mdnet.base.server
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import mdnet.base.Constants
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import mdnet.base.Statistics
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import mdnet.base.dao.ImageData
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import mdnet.base.dao.ImageDatum
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import mdnet.cache.CachingInputStream
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import mdnet.cache.DiskLruCache
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import org.apache.http.client.config.CookieSpecs
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import org.apache.http.client.config.RequestConfig
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import org.apache.http.impl.client.HttpClients
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import org.http4k.client.ApacheClient
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import org.http4k.core.*
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import org.http4k.filter.MaxAgeTtl
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import org.http4k.lens.Path
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import org.jetbrains.exposed.sql.Database
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import org.jetbrains.exposed.sql.SchemaUtils
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import org.jetbrains.exposed.sql.transactions.transaction
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import org.slf4j.LoggerFactory
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import java.io.BufferedInputStream
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import java.io.BufferedOutputStream
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import java.io.File
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import java.io.InputStream
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import java.security.MessageDigest
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import java.util.concurrent.Executors
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import java.util.concurrent.atomic.AtomicBoolean
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import java.util.concurrent.atomic.AtomicReference
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import javax.crypto.Cipher
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import javax.crypto.CipherInputStream
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import javax.crypto.CipherOutputStream
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import javax.crypto.spec.SecretKeySpec
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private const val THREADS_TO_ALLOCATE = 262144 // 2**18
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class ImageServer(private val cache: DiskLruCache, private val statistics: AtomicReference<Statistics>, private val upstreamUrl: String, private val database: Database, private val handled: AtomicBoolean) {
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init {
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transaction(database) {
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SchemaUtils.create(ImageData)
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}
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}
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private val executor = Executors.newCachedThreadPool()
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private val client = ApacheClient(responseBodyMode = BodyMode.Stream, client = HttpClients.custom()
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.setDefaultRequestConfig(
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RequestConfig.custom()
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.setCookieSpec(CookieSpecs.IGNORE_COOKIES)
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.setConnectTimeout(3000)
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.setSocketTimeout(3000)
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.setConnectionRequestTimeout(3000)
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.build())
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.setMaxConnTotal(THREADS_TO_ALLOCATE)
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.setMaxConnPerRoute(THREADS_TO_ALLOCATE)
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.build())
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fun handler(dataSaver: Boolean, tokenized: Boolean = false): HttpHandler = { request ->
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val chapterHash = Path.of("chapterHash")(request)
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val fileName = Path.of("fileName")(request)
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val sanitizedUri = if (dataSaver) {
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"/data-saver"
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} else {
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"/data"
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} + "/$chapterHash/$fileName"
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if (LOGGER.isInfoEnabled) {
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LOGGER.info("Request for $sanitizedUri received")
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}
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statistics.getAndUpdate {
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it.copy(requestsServed = it.requestsServed + 1)
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}
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val rc4Bytes = if (dataSaver) {
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md5Bytes("saver$chapterHash.$fileName")
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} else {
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md5Bytes("$chapterHash.$fileName")
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}
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val imageId = printHexString(rc4Bytes)
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val snapshot = cache.getUnsafe(imageId.toCacheId())
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val imageDatum = synchronized(database) {
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transaction(database) {
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ImageDatum.findById(imageId)
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}
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}
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handled.set(true)
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if (snapshot != null && imageDatum != null) {
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request.handleCacheHit(sanitizedUri, getRc4(rc4Bytes), snapshot, imageDatum)
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.header("X-Uri", sanitizedUri)
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} else {
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if (snapshot != null) {
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snapshot.close()
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if (LOGGER.isWarnEnabled) {
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LOGGER.warn("Removing cache file for $sanitizedUri without corresponding DB entry")
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}
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cache.removeUnsafe(imageId.toCacheId())
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}
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if (imageDatum != null) {
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if (LOGGER.isWarnEnabled) {
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LOGGER.warn("Deleting DB entry for $sanitizedUri without corresponding file")
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}
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synchronized(database) {
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transaction(database) {
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imageDatum.delete()
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}
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}
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}
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request.handleCacheMiss(sanitizedUri, getRc4(rc4Bytes), imageId)
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.header("X-Uri", sanitizedUri)
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}
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}
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private fun Request.handleCacheHit(sanitizedUri: String, cipher: Cipher, snapshot: DiskLruCache.Snapshot, imageDatum: ImageDatum): Response {
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// our files never change, so it's safe to use the browser cache
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return if (this.header("If-Modified-Since") != null) {
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statistics.getAndUpdate {
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it.copy(browserCached = it.browserCached + 1)
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}
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if (LOGGER.isInfoEnabled) {
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LOGGER.info("Request for $sanitizedUri cached by browser")
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}
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val lastModified = imageDatum.lastModified
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snapshot.close()
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Response(Status.NOT_MODIFIED)
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.header("Last-Modified", lastModified)
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} else {
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statistics.getAndUpdate {
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it.copy(cacheHits = it.cacheHits + 1)
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}
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if (LOGGER.isInfoEnabled) {
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LOGGER.info("Request for $sanitizedUri hit cache")
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}
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respondWithImage(
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CipherInputStream(BufferedInputStream(snapshot.getInputStream(0)), cipher),
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snapshot.getLength(0).toString(), imageDatum.contentType, imageDatum.lastModified,
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true
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)
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}
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}
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private fun Request.handleCacheMiss(sanitizedUri: String, cipher: Cipher, imageId: String): Response {
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if (LOGGER.isInfoEnabled) {
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LOGGER.info("Request for $sanitizedUri missed cache")
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}
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statistics.getAndUpdate {
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it.copy(cacheMisses = it.cacheMisses + 1)
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}
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val mdResponse = client(Request(Method.GET, "$upstreamUrl$sanitizedUri"))
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if (mdResponse.status != Status.OK) {
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if (LOGGER.isTraceEnabled) {
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LOGGER.trace("Upstream query for $sanitizedUri errored with status {}", mdResponse.status)
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}
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mdResponse.close()
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return Response(mdResponse.status)
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}
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if (LOGGER.isTraceEnabled) {
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LOGGER.trace("Upstream query for $sanitizedUri succeeded")
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}
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val contentType = mdResponse.header("Content-Type")!!
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val contentLength = mdResponse.header("Content-Length")
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val lastModified = mdResponse.header("Last-Modified")
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val editor = cache.editUnsafe(imageId.toCacheId())
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// A null editor means that this file is being written to
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// concurrently so we skip the cache process
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return if (editor != null && contentLength != null && lastModified != null) {
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if (LOGGER.isTraceEnabled) {
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LOGGER.trace("Request for $sanitizedUri is being cached and served")
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}
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synchronized(database) {
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transaction(database) {
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ImageDatum.new(imageId) {
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this.contentType = contentType
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this.lastModified = lastModified
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}
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}
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}
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val tee = CachingInputStream(
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mdResponse.body.stream,
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executor, CipherOutputStream(BufferedOutputStream(editor.newOutputStream(0)), cipher)
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) {
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try {
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if (editor.getLength(0) == contentLength.toLong()) {
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if (LOGGER.isInfoEnabled) {
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LOGGER.info("Cache download for $sanitizedUri committed")
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}
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editor.commit()
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} else {
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if (LOGGER.isWarnEnabled) {
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LOGGER.warn("Cache download for $sanitizedUri aborted")
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}
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editor.abort()
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}
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} catch (e: Exception) {
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if (LOGGER.isWarnEnabled) {
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LOGGER.warn("Cache go/no go for $sanitizedUri failed", e)
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}
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}
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}
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respondWithImage(tee, contentLength, contentType, lastModified, false)
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} else {
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editor?.abort()
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if (LOGGER.isTraceEnabled) {
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LOGGER.trace("Request for $sanitizedUri is being served")
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}
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respondWithImage(mdResponse.body.stream, contentLength, contentType, lastModified, false)
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}
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}
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private fun String.toCacheId() =
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this.substring(0, 8).replace("..(?!$)".toRegex(), "$0 ").split(" ".toRegex())
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.plus(this).joinToString(File.separator)
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private fun respondWithImage(input: InputStream, length: String?, type: String, lastModified: String?, cached: Boolean): Response =
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Response(Status.OK)
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.header("Content-Type", type)
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.header("X-Content-Type-Options", "nosniff")
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.header(
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"Cache-Control",
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listOf("public", MaxAgeTtl(Constants.MAX_AGE_CACHE).toHeaderValue()).joinToString(", ")
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)
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.header("Access-Control-Allow-Origin", "https://mangadex.org")
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.header("Access-Control-Expose-Headers", "*")
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.header("Timing-Allow-Origin", "https://mangadex.org")
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.let {
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if (length != null) {
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it.body(input, length.toLong()).header("Content-Length", length)
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} else {
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it.body(input).header("Transfer-Encoding", "chunked")
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}
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}
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.let {
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if (lastModified != null) {
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it.header("Last-Modified", lastModified)
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} else {
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it
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}
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}
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.header("X-Cache", if (cached) "HIT" else "MISS")
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companion object {
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private val LOGGER = LoggerFactory.getLogger(ImageServer::class.java)
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}
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}
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private fun getRc4(key: ByteArray): Cipher {
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val rc4 = Cipher.getInstance("RC4")
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rc4.init(Cipher.ENCRYPT_MODE, SecretKeySpec(key, "RC4"))
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return rc4
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}
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private fun md5Bytes(stringToHash: String): ByteArray {
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val digest = MessageDigest.getInstance("MD5")
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return digest.digest(stringToHash.toByteArray())
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}
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private fun printHexString(bytes: ByteArray): String {
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val sb = StringBuilder()
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for (b in bytes) {
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sb.append(String.format("%02x", b))
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}
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return sb.toString()
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}
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