1 package net.pterodactylus.sone.core
3 import com.google.common.base.Ticker
4 import com.google.common.cache.CacheBuilder
5 import freenet.keys.FreenetURI
6 import java.io.ByteArrayInputStream
7 import java.net.URLDecoder
8 import java.text.Normalizer
9 import java.util.concurrent.TimeUnit.MINUTES
10 import javax.imageio.ImageIO
11 import javax.inject.Inject
14 * [ElementLoader] implementation that uses a simple Guava [com.google.common.cache.Cache].
16 class DefaultElementLoader(private val freenetInterface: FreenetInterface, ticker: Ticker) : ElementLoader {
18 @Inject constructor(freenetInterface: FreenetInterface) : this(freenetInterface, Ticker.systemTicker())
20 private val loadingLinks = CacheBuilder.newBuilder().build<String, Boolean>()
21 private val failureCache = CacheBuilder.newBuilder().ticker(ticker).expireAfterWrite(30, MINUTES).build<String, Boolean>()
22 private val imageCache = CacheBuilder.newBuilder().build<String, LinkedElement>()
23 private val callback = object : FreenetInterface.BackgroundFetchCallback {
24 override fun shouldCancel(uri: FreenetURI, mimeType: String, size: Long): Boolean {
25 return !mimeType.startsWith("image/") || (size > 2097152)
28 override fun loaded(uri: FreenetURI, mimeType: String, data: ByteArray) {
29 if (!mimeType.startsWith("image/")) {
32 ByteArrayInputStream(data).use {
35 imageCache.get(uri.toString().decode().normalize()) { LinkedElement(uri.toString()) }
37 removeLoadingLink(uri)
40 override fun failed(uri: FreenetURI) {
41 failureCache.put(uri.toString().decode().normalize(), true)
42 removeLoadingLink(uri)
45 private fun removeLoadingLink(uri: FreenetURI) {
46 synchronized(loadingLinks) {
47 loadingLinks.invalidate(uri.toString().decode().normalize())
52 override fun loadElement(link: String): LinkedElement {
53 val normalizedLink = link.decode().normalize()
54 synchronized(loadingLinks) {
55 imageCache.getIfPresent(normalizedLink)?.run {
58 failureCache.getIfPresent(normalizedLink)?.run {
59 return LinkedElement(link, failed = true)
61 if (loadingLinks.getIfPresent(normalizedLink) == null) {
62 loadingLinks.put(normalizedLink, true)
63 freenetInterface.startFetch(FreenetURI(link), callback)
66 return LinkedElement(link, loading = true)
69 private fun String.decode() = URLDecoder.decode(this, "UTF-8")
70 private fun String.normalize() = Normalizer.normalize(this, Normalizer.Form.NFC)