247 lines
10 KiB
Kotlin
247 lines
10 KiB
Kotlin
/* ktlint-disable no-wildcard-imports */
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package mdnet.base.web
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import mdnet.base.Constants
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import mdnet.base.Netty
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import mdnet.base.ServerSettings
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import mdnet.base.Statistics
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import mdnet.base.settings.ClientSettings
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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.BodyMode
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import org.http4k.core.Method
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import org.http4k.core.Request
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import org.http4k.core.Response
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import org.http4k.core.Status
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import org.http4k.core.then
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import org.http4k.filter.CachingFilters
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import org.http4k.filter.MaxAgeTtl
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import org.http4k.filter.ServerFilters
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import org.http4k.lens.Path
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import org.http4k.routing.bind
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import org.http4k.routing.routes
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import org.http4k.server.Http4kServer
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import org.http4k.server.asServer
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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.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.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 val LOGGER = LoggerFactory.getLogger("Application")
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private const val THREADS_TO_ALLOCATE = 262144 // 2**18 // Honestly, no reason to not just let 'er rip. Inactive connections will expire on their own :D
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fun getServer(cache: DiskLruCache, serverSettings: ServerSettings, clientSettings: ClientSettings, statistics: AtomicReference<Statistics>): Http4kServer {
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val executor = Executors.newCachedThreadPool()
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if (LOGGER.isInfoEnabled) {
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LOGGER.info("Starting image retriever")
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}
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val client = ApacheClient(responseBodyMode = BodyMode.Stream, client = HttpClients.custom()
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.setDefaultRequestConfig(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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val app = { dataSaver: Boolean ->
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{ request: 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 $sanitizedUri received")
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}
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val rc4Bytes = if (dataSaver) {
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md5Bytes("saver$chapterHash.$fileName")
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} else {
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md5Bytes("$chapterHash.$fileName")
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}
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val cacheId = printHexString(rc4Bytes)
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statistics.getAndUpdate {
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it.copy(requestsServed = it.requestsServed + 1)
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}
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// Netty doesn't do Content-Length or Content-Type, so we have the pleasure of doing that ourselves
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fun respondWithImage(input: InputStream, length: String?, type: String, lastModified: String?): 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("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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val snapshot = cache.get(cacheId)
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if (snapshot != null) {
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// our files never change, so it's safe to use the browser cache
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if (request.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 = snapshot.getString(2)
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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)), getRc4(rc4Bytes)),
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snapshot.getLength(0).toString(), snapshot.getString(1), snapshot.getString(2)
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)
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}
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} else {
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statistics.getAndUpdate {
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it.copy(cacheMisses = it.cacheMisses + 1)
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}
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if (LOGGER.isInfoEnabled) {
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LOGGER.info("Request for $sanitizedUri missed cache")
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}
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val mdResponse = client(Request(Method.GET, "${serverSettings.imageServer}$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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Response(mdResponse.status)
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} else {
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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.edit(cacheId)
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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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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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editor.setString(1, contentType)
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editor.setString(2, lastModified)
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val tee = CachingInputStream(
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mdResponse.body.stream,
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executor, CipherOutputStream(BufferedOutputStream(editor.newOutputStream(0)), getRc4(rc4Bytes))
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) {
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// Note: if neither of the options get called/are in the log
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// check that tee gets closed and for exceptions in this lambda
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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.isInfoEnabled) {
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LOGGER.info("Cache download for $sanitizedUri aborted")
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}
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editor.abort()
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}
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}
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respondWithImage(tee, contentLength, contentType, lastModified)
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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)
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}
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}
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}
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}
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}
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CachingFilters
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return catchAllHideDetails()
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.then(ServerFilters.CatchLensFailure)
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.then(addCommonHeaders())
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.then(
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routes(
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"/data/{chapterHash}/{fileName}" bind Method.GET to app(false),
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"/data-saver/{chapterHash}/{fileName}" bind Method.GET to app(true),
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"/{token}/data/{chapterHash}/{fileName}" bind Method.GET to app(false),
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"/{token}/data-saver/{chapterHash}/{fileName}" bind Method.GET to app(true)
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)
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)
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.asServer(Netty(serverSettings.tls, clientSettings, statistics))
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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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