410 lines
16 KiB
Kotlin
410 lines
16 KiB
Kotlin
/*
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Mangadex@Home
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Copyright (c) 2020, MangaDex Network
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This file is part of MangaDex@Home.
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MangaDex@Home is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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MangaDex@Home is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this MangaDex@Home. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* ktlint-disable no-wildcard-imports */
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package mdnet.base.server
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import com.fasterxml.jackson.core.JsonProcessingException
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import com.fasterxml.jackson.databind.DeserializationFeature
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import com.fasterxml.jackson.databind.ObjectMapper
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import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
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import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
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import com.fasterxml.jackson.module.kotlin.readValue
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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.time.Clock
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import java.time.OffsetDateTime
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import java.util.*
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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 mdnet.base.Constants
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import mdnet.base.data.ImageData
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import mdnet.base.data.ImageDatum
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import mdnet.base.data.Statistics
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import mdnet.base.data.Token
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import mdnet.base.info
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import mdnet.base.netty.Netty
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import mdnet.base.settings.RemoteSettings
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import mdnet.base.settings.ServerSettings
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import mdnet.base.trace
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import mdnet.base.warn
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import mdnet.cache.CachingInputStream
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import mdnet.cache.DiskLruCache
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import mdnet.security.TweetNaclFast
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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.Apache4Client
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import org.http4k.core.*
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import org.http4k.filter.CachingFilters
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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.jetbrains.exposed.exceptions.ExposedSQLException
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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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private val LOGGER = LoggerFactory.getLogger(ImageServer::class.java)
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class ImageServer(
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private val cache: DiskLruCache,
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private val database: Database,
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private val statistics: AtomicReference<Statistics>,
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private val remoteSettings: RemoteSettings,
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private val client: HttpHandler
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) {
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init {
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synchronized(database) {
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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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}
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private val executor = Executors.newCachedThreadPool()
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fun handler(dataSaver: Boolean, tokenized: Boolean = false): HttpHandler {
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val box = TweetNaclFast.SecretBox(remoteSettings.tokenKey)
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return baseHandler().then { 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 (!request.referrerMatches(ALLOWED_REFERER_DOMAINS)) {
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LOGGER.info { "Request for $sanitizedUri rejected due to non-allowed referrer ${request.header("Referer")}" }
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return@then Response(Status.FORBIDDEN)
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}
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if (tokenized || remoteSettings.forceTokens) {
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val tokenArr = Base64.getUrlDecoder().decode(Path.of("token")(request))
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if (tokenArr.size < 24) {
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LOGGER.info { "Request for $sanitizedUri rejected for invalid token" }
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return@then Response(Status.FORBIDDEN)
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}
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val token = try {
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JACKSON.readValue<Token>(
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box.open(tokenArr.sliceArray(24 until tokenArr.size), tokenArr.sliceArray(0 until 24)).apply {
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if (this == null) {
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LOGGER.info { "Request for $sanitizedUri rejected for invalid token" }
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return@then Response(Status.FORBIDDEN)
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}
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}
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)
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} catch (e: JsonProcessingException) {
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LOGGER.info(e) { "Request for $sanitizedUri rejected for invalid token" }
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return@then Response(Status.FORBIDDEN)
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}
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if (OffsetDateTime.now().isAfter(token.expires)) {
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LOGGER.info { "Request for $sanitizedUri rejected for expired token" }
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return@then Response(Status.GONE)
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}
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if (token.hash != chapterHash) {
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LOGGER.info { "Request for $sanitizedUri rejected for inapplicable token" }
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return@then Response(Status.FORBIDDEN)
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}
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}
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statistics.getAndUpdate {
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it.copy(requestsServed = it.requestsServed + 1)
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}
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val rc4Bytes = if (dataSaver) {
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md5Bytes("saver$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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if (snapshot != null && imageDatum != null && imageDatum.contentType.isImageMimetype()) {
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request.handleCacheHit(sanitizedUri, getRc4(rc4Bytes), snapshot, imageDatum)
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} else {
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if (snapshot != null) {
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snapshot.close()
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LOGGER.warn { "Removing broken cache file for $sanitizedUri" }
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cache.removeUnsafe(imageId.toCacheId())
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cache.flush()
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}
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request.handleCacheMiss(sanitizedUri, getRc4(rc4Bytes), imageId, imageDatum)
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}
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}
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}
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/**
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* Filters referrers based on passed (sub)domains. Ignores `scheme` (protocol) in URL
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*/
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private fun Request.referrerMatches(allowedDomains: List<String>, permitBlank: Boolean = true): Boolean {
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val referer = this.header("Referer") ?: return permitBlank // Referrer was misspelled as "Referer" and now we're stuck with it -_-
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if (referer == "") return permitBlank
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return allowedDomains.any {
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referer.substringAfter("//") // Ignore scheme
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.substringBefore("/") // Ignore path
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.substringBefore(":")
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.endsWith(it)
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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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LOGGER.info { "Request for $sanitizedUri cached by browser" }
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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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LOGGER.info { "Request for $sanitizedUri hit cache" }
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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, imageDatum: ImageDatum?): Response {
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LOGGER.info { "Request for $sanitizedUri missed cache" }
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statistics.getAndUpdate {
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it.copy(cacheMisses = it.cacheMisses + 1)
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}
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val mdResponse = client(Request(Method.GET, "${remoteSettings.imageServer}$sanitizedUri"))
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if (mdResponse.status != Status.OK) {
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LOGGER.trace { "Upstream query for $sanitizedUri errored with status ${mdResponse.status}" }
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mdResponse.close()
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return Response(mdResponse.status)
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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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if (!contentType.isImageMimetype()) {
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LOGGER.trace { "Upstream query for $sanitizedUri returned bad mimetype $contentType" }
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mdResponse.close()
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return Response(Status.INTERNAL_SERVER_ERROR)
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}
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LOGGER.trace { "Upstream query for $sanitizedUri succeeded" }
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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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LOGGER.trace { "Request for $sanitizedUri is being cached and served" }
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if (imageDatum == null) {
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try {
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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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} catch (_: ExposedSQLException) {
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// some other code got to the database first, fall back to just serving
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editor.abort()
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LOGGER.trace { "Request for $sanitizedUri is being served" }
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respondWithImage(mdResponse.body.stream, contentLength, contentType, lastModified, false)
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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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LOGGER.info { "Cache download for $sanitizedUri committed" }
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editor.commit()
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cache.flush()
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} else {
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LOGGER.warn { "Cache download for $sanitizedUri aborted" }
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editor.abort()
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}
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} catch (e: Exception) {
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LOGGER.warn(e) { "Cache go/no go for $sanitizedUri failed" }
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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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LOGGER.trace { "Request for $sanitizedUri is being served" }
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respondWithImage(mdResponse.body.stream, contentLength, contentType, lastModified, false)
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}
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}
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private fun String.toCacheId() =
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this.substring(0, 8).replace("..(?!$)".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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.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 JACKSON: ObjectMapper = jacksonObjectMapper()
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.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
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.registerModule(JavaTimeModule())
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private val ALLOWED_REFERER_DOMAINS = listOf("mangadex.org", "mangadex.network") // TODO: Factor out hardcoded domains?
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private fun baseHandler(): Filter =
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CachingFilters.Response.MaxAge(Clock.systemUTC(), Constants.MAX_AGE_CACHE)
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.then(Filter { next: HttpHandler ->
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{ request: Request ->
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val response = next(request)
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response.header("access-control-allow-origin", "https://mangadex.org")
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.header("access-control-allow-headers", "*")
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.header("access-control-allow-methods", "GET")
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.header("timing-allow-origin", "https://mangadex.org")
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}
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})
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}
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}
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private fun String.isImageMimetype() = this.toLowerCase().startsWith("image/")
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fun getServer(cache: DiskLruCache, database: Database, remoteSettings: RemoteSettings, serverSettings: ServerSettings, statistics: AtomicReference<Statistics>, isHandled: AtomicBoolean): Http4kServer {
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val client = Apache4Client(responseBodyMode = BodyMode.Stream, client = HttpClients.custom()
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.disableConnectionState()
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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(3000)
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.setMaxConnPerRoute(3000)
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.build())
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val imageServer = ImageServer(cache, database, statistics, remoteSettings, client)
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return timeRequest()
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.then(catchAllHideDetails())
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.then(ServerFilters.CatchLensFailure)
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.then(setHandled(isHandled))
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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 imageServer.handler(dataSaver = false),
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"/data-saver/{chapterHash}/{fileName}" bind Method.GET to imageServer.handler(dataSaver = true),
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"/{token}/data/{chapterHash}/{fileName}" bind Method.GET to imageServer.handler(
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dataSaver = false,
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tokenized = true
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),
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"/{token}/data-saver/{chapterHash}/{fileName}" bind Method.GET to imageServer.handler(
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dataSaver = true,
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tokenized = true
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)
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)
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)
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.asServer(Netty(remoteSettings.tls!!, serverSettings, statistics))
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}
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fun setHandled(isHandled: AtomicBoolean): Filter {
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return Filter { next: HttpHandler ->
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{
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isHandled.set(true)
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next(it)
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}
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}
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}
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fun timeRequest(): Filter {
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return Filter { next: HttpHandler ->
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{ request: Request ->
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val cleanedUri = request.uri.path.let {
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if (it.startsWith("/data")) {
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it
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} else {
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it.replaceBefore("/data", "/{token}")
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}
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}
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LOGGER.info { "Request for $cleanedUri received from ${request.source?.address}" }
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val start = System.currentTimeMillis()
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val response = next(request)
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val latency = System.currentTimeMillis() - start
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LOGGER.info { "Request for $cleanedUri completed (TTFB) in ${latency}ms" }
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response.header("X-Time-Taken", latency.toString())
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}
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}
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}
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