added input downloader

app/src/test/kotlin/util/InputDownloader.kt

@@ -0,0 +1,64 @@
+package util
+
+import java.net.URI
+import java.net.http.HttpClient
+import java.net.http.HttpRequest
+import java.net.http.HttpResponse
+import java.net.HttpCookie
+import java.net.CookieHandler
+import java.net.CookieManager
+import java.net.ConnectException
+import java.time.Duration
+import io.github.cdimascio.dotenv.dotenv
+
+class InputDownloader {
+    fun getInput(day: Int): String {
+        val dotenv = dotenv()
+        val sessionCookie = HttpCookie("session", dotenv["AOC_TOKEN"]);
+        sessionCookie.path = "/"
+        sessionCookie.version = 0
+
+        val manager = CookieManager()
+        manager.getCookieStore().add(URI("https://adventofcode.com"), sessionCookie)
+
+        val client = HttpClient.newBuilder()
+            .cookieHandler(manager)
+            .connectTimeout(Duration.ofSeconds(10))
+            .build()
+
+        val request = HttpRequest.newBuilder()
+            .uri(URI.create("https://adventofcode.com/2024/day/$day/input"))
+            .GET()
+            .build()
+
+        val res = client.send(request, HttpResponse.BodyHandlers.ofString())
+        if (res.statusCode() == 403) {
+            throw ConnectException("Failed to download input for day $day. Is your session token correct?")
+        }
+        if (res.statusCode() != ) {
+            throw ConnectException("Failed to download input for day $day. Is the day open yet?")
+        }
+
+        return res.body().trim()
+    }
+
+    fun getExample(day: Int): String {
+        val client = HttpClient.newBuilder().connectTimeout(Duration.ofSeconds(10)).build()
+
+        val req = HttpRequest.newBuilder()
+            .uri(URI("https://adventofcode.com/2024/day/$day"))
+            .GET()
+            .build()
+
+        val res = client.send(req, HttpResponse.BodyHandlers.ofString())
+        if (res.statusCode() != 200) {
+            throw ConnectException("Failed to download example for day $day. Is the day open yet?")
+        }
+
+        val bod = res.body()
+        val start = bod.indexOf("<pre><code>")
+        val stop = bod.indexOf("</code></pre>")
+        val sliced = bod.substring(start + 11..<stop)
+        return sliced.trim()
+    }
+}