fix (feat): Implement animated GIF / WEBP images

Author: dragonx943

app/src/main/kotlin/org/dokiteam/doki/core/util/ext/Coil.kt

@@ -82,3 +82,25 @@ fun SourceFetchResult.copyWithNewSource(): SourceFetchResult = SourceFetchResult
 	mimeType = mimeType,
 	dataSource = dataSource,
 )
+
+fun String.isAnimatedWebP(): Boolean = runCatching {
+    val client = okhttp3.OkHttpClient.Builder()
+        .connectTimeout(2, java.util.concurrent.TimeUnit.SECONDS)
+        .readTimeout(2, java.util.concurrent.TimeUnit.SECONDS)
+        .build()
+
+    val request = okhttp3.Request.Builder()
+        .url(this)
+        .header("Range", "bytes=0-20")
+        .build()
+
+    client.newCall(request).execute().use { response ->
+        val bytes = response.body.bytes()
+
+        bytes.size >= 21 &&
+            bytes[0] == 0x52.toByte() && bytes[3] == 0x46.toByte() &&
+            bytes[8] == 0x57.toByte() && bytes[11] == 0x50.toByte() &&
+            bytes[12] == 0x56.toByte() && bytes[15] == 0x58.toByte() &&
+            (bytes[20].toInt() and 0x02) != 0
+    }
+}.getOrDefault(false)

app/src/main/kotlin/org/dokiteam/doki/core/util/ext/String.kt

@@ -72,7 +72,11 @@ fun <T> Collection<T>.joinToStringWithLimit(context: Context, limit: Int, transf
 
 fun String.isHttpUrl() = startsWith("https://", ignoreCase = true) || startsWith("http://", ignoreCase = true)
 
-fun String.isAnimatedImage() = substringBefore("?").run { endsWith(".gif", ignoreCase = true) || endsWith(".webp", ignoreCase = true) }
+fun String.isAnimatedImage() = when {
+    contains(".gif", ignoreCase = true) -> true
+    contains(".webp", ignoreCase = true) -> isAnimatedWebP()
+    else -> false
+}
 
 fun concatStrings(context: Context, a: String?, b: String?): String? = when {
 	a.isNullOrEmpty() && b.isNullOrEmpty() -> null