2 files changed, 152 insertions, 0 deletions
diff --git a/src/main/kotlin/moe/nea/firmament/features/FeatureManager.kt b/src/main/kotlin/moe/nea/firmament/features/FeatureManager.kt
index 0f0a166..86db2f0 100644
--- a/src/main/kotlin/moe/nea/firmament/features/FeatureManager.kt
+++ b/src/main/kotlin/moe/nea/firmament/features/FeatureManager.kt
@@ -21,6 +21,7 @@ package moe.nea.firmament.features
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.serializer
 import moe.nea.firmament.Firmament
+import moe.nea.firmament.features.chat.ImagePreview
 import moe.nea.firmament.features.debug.DebugView
 import moe.nea.firmament.features.debug.DeveloperFeatures
 import moe.nea.firmament.features.fishing.FishingWarning
@@ -55,6 +56,7 @@ object FeatureManager : DataHolder<FeatureManager.Config>(serializer(), "feature
             loadFeature(SlotLocking)
             loadFeature(StorageOverlay)
             loadFeature(CraftingOverlay)
+            loadFeature(ImagePreview)
             loadFeature(SaveCursorPosition)
             if (Firmament.DEBUG) {
                 loadFeature(DeveloperFeatures)
diff --git a/src/main/kotlin/moe/nea/firmament/features/chat/ImagePreview.kt b/src/main/kotlin/moe/nea/firmament/features/chat/ImagePreview.kt
new file mode 100644
index 0000000..5dcacc3
--- /dev/null
+++ b/src/main/kotlin/moe/nea/firmament/features/chat/ImagePreview.kt
@@ -0,0 +1,150 @@
+package moe.nea.firmament.features.chat
+
+import io.ktor.client.request.*
+import io.ktor.client.statement.*
+import io.ktor.utils.io.jvm.javaio.*
+import java.net.URL
+import java.util.*
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.async
+import kotlin.math.min
+import net.minecraft.client.gui.screen.ChatScreen
+import net.minecraft.client.texture.NativeImage
+import net.minecraft.client.texture.NativeImageBackedTexture
+import net.minecraft.text.HoverEvent
+import net.minecraft.text.Style
+import net.minecraft.text.Text
+import net.minecraft.util.Formatting
+import net.minecraft.util.Identifier
+import moe.nea.firmament.Firmament
+import moe.nea.firmament.events.ClientChatLineReceivedEvent
+import moe.nea.firmament.events.ScreenRenderPostEvent
+import moe.nea.firmament.features.FirmamentFeature
+import moe.nea.firmament.gui.config.ManagedConfig
+import moe.nea.firmament.util.MC
+import moe.nea.firmament.util.transformEachRecursively
+import moe.nea.firmament.util.unformattedString
+
+object ImagePreview : FirmamentFeature {
+    override val identifier: String
+        get() = "image-preview"
+
+    object TConfig : ManagedConfig(identifier) {
+        val enabled by toggle("enabled") { true }
+        val allowAllHosts by toggle("allow-all-hosts") { false }
+        val allowedHosts by string("allowed-hosts") { "cdn.discordapp.com,media.discordapp.com,media.discordapp.net,i.imgur.com" }
+        val actualAllowedHosts get() = allowedHosts.split(",").map { it.trim() }
+        val screenPercentage by integer("percentage", 10, 100) { 50 }
+    }
+
+    fun isHostAllowed(host: String) =
+        TConfig.allowAllHosts || TConfig.actualAllowedHosts.any { it.equals(host, ignoreCase = true) }
+
+    fun isUrlAllowed(url: String) = isHostAllowed(url.removePrefix("https://").substringBefore("/"))
+
+    override val config get() = TConfig
+    val urlRegex = "https://[^. ]+\\.[^ ]+(\\.(png|gif|jpe?g))(\\?[^ ]*)?( |$)".toRegex()
+
+    data class Image(
+        val texture: Identifier,
+        val width: Int,
+        val height: Int,
+    )
+
+    val imageCache: MutableMap<String, Deferred<Image?>> =
+        Collections.synchronizedMap(mutableMapOf<String, Deferred<Image?>>())
+
+    fun tryCacheUrl(url: String) {
+        if (!isUrlAllowed(url)) {
+            return
+        }
+        if (url in imageCache) {
+            return
+        }
+        imageCache[url] = Firmament.coroutineScope.async {
+            try {
+                val response = Firmament.httpClient.get(URL(url))
+                if (response.status.value == 200) {
+                    val inputStream = response.bodyAsChannel().toInputStream(Firmament.globalJob)
+                    val image = NativeImage.read(inputStream)
+                    val texture = MC.textureManager.registerDynamicTexture(
+                        "dynamic_image_preview",
+                        NativeImageBackedTexture(image)
+                    )
+                    Image(texture, image.width, image.height)
+                } else
+                    null
+            } catch (exc: Exception) {
+                exc.printStackTrace()
+                null
+            }
+        }
+    }
+
+    override fun onLoad() {
+        ClientChatLineReceivedEvent.subscribe {
+            it.replaceWith = it.text.transformEachRecursively { child ->
+                val text = child.string
+                if ("://" !in text) return@transformEachRecursively child
+                val s = Text.empty().setStyle(child.style)
+                var index = 0
+                while (index < text.length) {
+                    val nextMatch = urlRegex.find(text, index)
+                    if (nextMatch == null) {
+                        s.append(Text.literal(text.substring(index, text.length)))
+                        break
+                    }
+                    val range = nextMatch.groups[0]!!.range
+                    val url = nextMatch.groupValues[0]
+                    s.append(Text.literal(text.substring(index, range.first)))
+                    s.append(
+                        Text.literal(url).setStyle(
+                            Style.EMPTY.withUnderline(true).withColor(
+                                Formatting.AQUA
+                            ).withHoverEvent(HoverEvent(HoverEvent.Action.SHOW_TEXT, Text.literal(url)))
+                        )
+                    )
+                    tryCacheUrl(url)
+                    index = range.last + 1
+                }
+                s
+            }
+        }
+
+        ScreenRenderPostEvent.subscribe {
+            if (!TConfig.enabled) return@subscribe
+            if (it.screen !is ChatScreen) return@subscribe
+            val hoveredComponent =
+                MC.inGameHud.chatHud.getTextStyleAt(it.mouseX.toDouble(), it.mouseY.toDouble()) ?: return@subscribe
+            val hoverEvent = hoveredComponent.hoverEvent ?: return@subscribe
+            val value = hoverEvent.getValue(HoverEvent.Action.SHOW_TEXT) ?: return@subscribe
+            val url = urlRegex.matchEntire(value.unformattedString)?.groupValues?.get(0) ?: return@subscribe
+            val imageFuture = imageCache[url] ?: return@subscribe
+            if (!imageFuture.isCompleted) return@subscribe
+            val image = imageFuture.getCompleted() ?: return@subscribe
+            val screen = MC.screen!!
+            val scale =
+                min(
+                    1F,
+                    min(
+                        (TConfig.screenPercentage / 100F * screen.width.toFloat()) / image.width,
+                        screen.height.toFloat() / image.height
+                    )
+                )
+            it.drawContext.matrices.push()
+            it.drawContext.matrices.scale(scale, scale, 1F)
+            it.drawContext.drawTexture(
+                image.texture,
+                0,
+                0,
+                1F,
+                1F,
+                image.width,
+                image.height,
+                image.width,
+                image.height,
+            )
+            it.drawContext.matrices.pop()
+        }
+    }
+}