From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Fri, 11 Nov 2016 07:11:27 +0000 (+0100)
Subject: Add image loader
X-Git-Tag: 0.9.7^2~449
X-Git-Url: https://git.pterodactylus.net/?p=Sone.git;a=commitdiff_plain;h=5331998f4c37d54637737b79e5ef8844dc64d72b

Add image loader
---

diff --git a/src/main/kotlin/net/pterodactylus/sone/core/DefaultImageLoader.kt b/src/main/kotlin/net/pterodactylus/sone/core/DefaultImageLoader.kt
new file mode 100644
index 0000000..469feb8
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/core/DefaultImageLoader.kt
@@ -0,0 +1,38 @@
+package net.pterodactylus.sone.core
+
+import com.google.common.cache.CacheBuilder
+import freenet.keys.FreenetURI
+import java.io.ByteArrayInputStream
+import javax.imageio.ImageIO
+
+/**
+ * [ImageLoader] implementation that uses a simple Guava [com.google.common.cache.Cache].
+ */
+class DefaultImageLoader(private val freenetInterface: FreenetInterface) : ImageLoader {
+
+	private val imageCache = CacheBuilder.newBuilder().build<String, LoadedImage>()
+	private val callback = object : FreenetInterface.BackgroundFetchCallback {
+		override fun loaded(uri: FreenetURI, mimeType: String, data: ByteArray) {
+			if (!mimeType.startsWith("image/")) {
+				return
+			}
+			val image = ByteArrayInputStream(data).use {
+				ImageIO.read(it)
+			}
+			val loadedImage = LoadedImage(uri.toString(), mimeType, image.width, image.height)
+			imageCache.get(uri.toString()) { loadedImage }
+		}
+
+		override fun failed(uri: FreenetURI) {
+		}
+	}
+
+	override fun toLoadedImage(link: String): LoadedImage? {
+		imageCache.getIfPresent(link)?.run {
+			return this
+		}
+		freenetInterface.startFetch(FreenetURI(link), callback)
+		return null
+	}
+
+}
diff --git a/src/main/kotlin/net/pterodactylus/sone/core/ImageLoader.kt b/src/main/kotlin/net/pterodactylus/sone/core/ImageLoader.kt
new file mode 100644
index 0000000..6d7fb36
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/core/ImageLoader.kt
@@ -0,0 +1,12 @@
+package net.pterodactylus.sone.core
+
+/**
+ * Component that loads images and supplies information about them.
+ */
+interface ImageLoader {
+
+	fun toLoadedImage(link: String): LoadedImage?
+
+}
+
+data class LoadedImage(val link: String, val mimeType: String, val width: Int, val height: Int)
diff --git a/src/test/kotlin/net/pterodactylus/sone/core/DefaultImageLoaderTest.kt b/src/test/kotlin/net/pterodactylus/sone/core/DefaultImageLoaderTest.kt
new file mode 100644
index 0000000..cc31665
--- /dev/null
+++ b/src/test/kotlin/net/pterodactylus/sone/core/DefaultImageLoaderTest.kt
@@ -0,0 +1,59 @@
+package net.pterodactylus.sone.core
+
+import com.google.common.io.ByteStreams
+import com.google.common.io.Files
+import freenet.keys.FreenetURI
+import net.pterodactylus.sone.core.FreenetInterface.BackgroundFetchCallback
+import net.pterodactylus.sone.test.capture
+import net.pterodactylus.sone.test.mock
+import org.hamcrest.MatcherAssert
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.Matchers
+import org.hamcrest.Matchers.`is`
+import org.hamcrest.Matchers.nullValue
+import org.junit.Test
+import org.mockito.ArgumentMatchers.any
+import org.mockito.ArgumentMatchers.eq
+import org.mockito.Mockito.verify
+import java.io.ByteArrayOutputStream
+
+/**
+ * Unit test for [DefaultImageLoaderTest].
+ */
+class DefaultImageLoaderTest {
+
+	companion object {
+		private const val IMAGE_ID = "KSK@gpl.png"
+	}
+
+	private val freenetInterface = mock<FreenetInterface>()
+	private val imageLoader = DefaultImageLoader(freenetInterface)
+	private val callback = capture<BackgroundFetchCallback>()
+
+	@Test
+	fun `image loader starts request for link that is not known`() {
+		assertThat(imageLoader.toLoadedImage(IMAGE_ID), nullValue())
+		verify(freenetInterface).startFetch(eq(FreenetURI(IMAGE_ID)), any<BackgroundFetchCallback>())
+	}
+
+	@Test
+	fun `image loader can load image`() {
+		assertThat(imageLoader.toLoadedImage(IMAGE_ID), nullValue())
+		verify(freenetInterface).startFetch(eq(FreenetURI(IMAGE_ID)), callback.capture())
+	    callback.value.loaded(FreenetURI(IMAGE_ID), "image/png", read("/static/images/unknown-image-0.png"))
+		val loadedImage = imageLoader.toLoadedImage(IMAGE_ID)!!
+		assertThat(loadedImage.link, `is`(IMAGE_ID))
+		assertThat(loadedImage.mimeType, `is`("image/png"))
+		assertThat(loadedImage.width, `is`(200))
+		assertThat(loadedImage.height, `is`(150))
+	}
+
+	private fun read(resource: String): ByteArray =
+			javaClass.getResourceAsStream(resource)?.use { input ->
+				ByteArrayOutputStream().use {
+					ByteStreams.copy(input, it)
+					it
+				}.toByteArray()
+			} ?: ByteArray(0)
+
+}
diff --git a/src/test/kotlin/net/pterodactylus/sone/test/Mockotlin.kt b/src/test/kotlin/net/pterodactylus/sone/test/Mockotlin.kt
index ed2f3fc..5ce82df 100644
--- a/src/test/kotlin/net/pterodactylus/sone/test/Mockotlin.kt
+++ b/src/test/kotlin/net/pterodactylus/sone/test/Mockotlin.kt
@@ -1,5 +1,7 @@
 package net.pterodactylus.sone.test
 
+import org.mockito.ArgumentCaptor
 import org.mockito.Mockito
 
 inline fun <reified T : Any> mock(): T = Mockito.mock<T>(T::class.java)!!
+inline fun <reified T : Any> capture(): ArgumentCaptor<T> = ArgumentCaptor.forClass(T::class.java)