Switch from Gson to Jackson for better null checks and invalid property support

CHANGELOG.md

@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 ### Added
+- [2020-06-19] Errored out on invalid settings.json tokens [@carbotaniuman]
 
 ### Changed
 - [2020-06-19] Changed default CPU thread count to `4` by [@lflare].

build.gradle

@@ -20,16 +20,16 @@ dependencies {
   compileOnly group:"dev.afanasev", name: "sekret-annotation", version: "0.0.3"
 
   implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+  implementation "org.jetbrains.kotlin:kotlin-reflect"
+
   implementation group: "commons-io", name: "commons-io", version: "2.7"
-  implementation group: "com.konghq", name: "unirest-java", version: "3.7.02"
 
   implementation group: "org.http4k", name: "http4k-core", version: "$http_4k_version"
-  implementation group: "org.http4k", name: "http4k-format-gson", version: "$http_4k_version"
+  implementation group: "org.http4k", name: "http4k-format-jackson", version: "$http_4k_version"
   implementation group: "org.http4k", name: "http4k-client-apache", version: "$http_4k_version"
   implementation group: "org.http4k", name: "http4k-server-netty", version: "$http_4k_version"
   runtimeOnly group:"io.netty", name: "netty-tcnative-boringssl-static", version: "2.0.30.Final"
 
-
   implementation group:"ch.qos.logback", name: "logback-classic", version: "1.2.1"
 
   implementation group: "org.jetbrains.exposed", name: "exposed-core",  version: "$exposed_version"

src/main/java/mdnet/base/Main.java

@@ -1,104 +0,0 @@
-package mdnet.base;
-
-import mdnet.base.settings.ClientSettings;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.io.FileNotFoundException;
-import java.io.FileReader;
-import java.io.FileWriter;
-import java.io.IOException;
-import java.util.regex.Pattern;
-
-import static mdnet.base.Constants.GSON;
-
-public class Main {
-	private final static Logger LOGGER = LoggerFactory.getLogger(Main.class);
-
-	public static void main(String[] args) {
-		System.out.println("Mangadex@Home Client " + Constants.CLIENT_VERSION + " (Build " + Constants.CLIENT_BUILD
-				+ ") initializing\n");
-		System.out.println("Copyright (c) 2020, MangaDex Network");
-
-		String file = "settings.json";
-		if (args.length == 1) {
-			file = args[0];
-		} else if (args.length != 0) {
-			dieWithError("Expected one argument: path to config file, or nothing");
-		}
-
-		ClientSettings settings;
-
-		try {
-			settings = GSON.fromJson(new FileReader(file), ClientSettings.class);
-		} catch (FileNotFoundException ignored) {
-			settings = new ClientSettings();
-			LOGGER.warn("Settings file {} not found, generating file", file);
-			try (FileWriter writer = new FileWriter(file)) {
-				writer.write(GSON.toJson(settings));
-			} catch (IOException e) {
-				dieWithError(e);
-			}
-		}
-
-		validateSettings(settings);
-
-		if (LOGGER.isInfoEnabled()) {
-			LOGGER.info("Client settings loaded: {}", settings);
-		}
-
-		MangaDexClient client = new MangaDexClient(settings);
-		Runtime.getRuntime().addShutdownHook(new Thread(client::shutdown));
-		client.runLoop();
-	}
-
-	public static void dieWithError(Throwable e) {
-		if (LOGGER.isErrorEnabled()) {
-			LOGGER.error("Critical Error", e);
-		}
-		System.exit(1);
-	}
-
-	public static void dieWithError(String error) {
-		if (LOGGER.isErrorEnabled()) {
-			LOGGER.error("Critical Error: {}", error);
-		}
-		System.exit(1);
-	}
-
-	public static void validateSettings(ClientSettings settings) {
-		if (!isSecretValid(settings.getClientSecret()))
-			dieWithError("Config Error: API Secret is invalid, must be 52 alphanumeric characters");
-
-		if (settings.getClientPort() == 0) {
-			dieWithError("Config Error: Invalid port number");
-		}
-
-		if (settings.getMaxCacheSizeInMebibytes() < 1024) {
-			dieWithError("Config Error: Invalid max cache size, must be >= 1024 MiB (1GiB)");
-		}
-
-		if (settings.getThreads() < 4) {
-			dieWithError("Config Error: Invalid number of threads, must be >= 4");
-		}
-
-		if (settings.getMaxMebibytesPerHour() < 0) {
-			dieWithError("Config Error: Max bandwidth must be >= 0");
-		}
-
-		if (settings.getMaxKilobitsPerSecond() < 0) {
-			dieWithError("Config Error: Max burst rate must be >= 0");
-		}
-
-		if (settings.getWebSettings() != null) {
-			if (settings.getWebSettings().getUiPort() == 0) {
-				dieWithError("Config Error: Invalid UI port number");
-			}
-		}
-	}
-
-	public static boolean isSecretValid(String clientSecret) {
-		final int CLIENT_KEY_LENGTH = 52;
-		return Pattern.matches("^[a-zA-Z0-9]{" + CLIENT_KEY_LENGTH + "}$", clientSecret);
-	}
-}

src/main/java/mdnet/base/MangaDexClient.java

@@ -3,6 +3,7 @@ package mdnet.base;
 import mdnet.base.settings.ClientSettings;
 import mdnet.base.server.ApplicationKt;
 import mdnet.base.server.WebUiKt;
+import mdnet.base.settings.ServerSettings;
 import mdnet.cache.DiskLruCache;
 import org.http4k.server.Http4kServer;
 import org.slf4j.Logger;
@@ -19,7 +20,7 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 
-import static mdnet.base.Constants.GSON;
+import static mdnet.base.Constants.JACKSON;
 
 public class MangaDexClient {
 	private final static Logger LOGGER = LoggerFactory.getLogger(MangaDexClient.class);
@@ -62,8 +63,8 @@ public class MangaDexClient {
 
 			DiskLruCache.Snapshot snapshot = cache.get("statistics");
 			if (snapshot != null) {
-				String json = snapshot.getString(0);
-				statistics.set(GSON.fromJson(json, Statistics.class));
+				statistics.set(JACKSON.readValue(snapshot.getInputStream(0), Statistics.class));
+				snapshot.close();
 			} else {
 				statistics.set(new Statistics());
 			}
@@ -215,8 +216,7 @@ public class MangaDexClient {
 
 		DiskLruCache.Editor editor = cache.edit("statistics");
 		if (editor != null) {
-			String json = GSON.toJson(statistics.get(), Statistics.class);
-			editor.setString(0, json);
+			JACKSON.writeValue(editor.newOutputStream(0), Statistics.class);
 			editor.commit();
 		}
 	}

src/main/java/mdnet/base/ServerHandler.java

@@ -1,84 +0,0 @@
-package mdnet.base;
-
-import kong.unirest.HttpResponse;
-import kong.unirest.Unirest;
-import kong.unirest.json.JSONObject;
-import mdnet.base.settings.ClientSettings;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.HashMap;
-
-public class ServerHandler {
-	private final static Logger LOGGER = LoggerFactory.getLogger(ServerHandler.class);
-	private static final String SERVER_ADDRESS = "https://api.mangadex.network/";
-
-	private final ClientSettings settings;
-
-	public ServerHandler(ClientSettings settings) {
-		this.settings = settings;
-	}
-
-	public boolean logoutFromControl() {
-		if (LOGGER.isInfoEnabled()) {
-			LOGGER.info("Disconnecting from the control server");
-		}
-
-		HashMap<String, Object> params = new HashMap<>();
-		params.put("secret", settings.getClientSecret());
-
-		HttpResponse<?> json = Unirest.post(SERVER_ADDRESS + "stop").header("Content-Type", "application/json")
-				.body(new JSONObject(params)).asEmpty();
-
-		return json.isSuccess();
-	}
-
-	public ServerSettings loginToControl() {
-		if (LOGGER.isInfoEnabled()) {
-			LOGGER.info("Connecting to the control server");
-		}
-
-		HashMap<String, Object> params = new HashMap<>();
-		params.put("secret", settings.getClientSecret());
-		params.put("port", settings.getClientPort());
-		params.put("disk_space", settings.getMaxCacheSizeInMebibytes() * 1024 * 1024 /* MiB to bytes */);
-		params.put("network_speed", settings.getMaxKilobitsPerSecond() * 1000 / 8 /* Kbps to bytes */);
-		params.put("build_version", Constants.CLIENT_BUILD);
-
-		HttpResponse<ServerSettings> response = Unirest.post(SERVER_ADDRESS + "ping")
-				.header("Content-Type", "application/json").body(new JSONObject(params)).asObject(ServerSettings.class);
-
-		if (response.isSuccess()) {
-			return response.getBody();
-		} else {
-			// unirest deserializes errors into an object with all null fields instead of a
-			// null object
-			return null;
-		}
-	}
-
-	public ServerSettings pingControl(ServerSettings old) {
-		if (LOGGER.isInfoEnabled()) {
-			LOGGER.info("Pinging the control server");
-		}
-
-		HashMap<String, Object> params = new HashMap<>();
-		params.put("secret", settings.getClientSecret());
-		params.put("port", settings.getClientPort());
-		params.put("disk_space", settings.getMaxCacheSizeInMebibytes() * 1024 * 1024 /* MiB to bytes */);
-		params.put("network_speed", settings.getMaxKilobitsPerSecond() * 1000 / 8 /* Kbps to bytes */);
-		params.put("build_version", Constants.CLIENT_BUILD);
-		params.put("tls_created_at", old.getTls().getCreatedAt());
-
-		HttpResponse<ServerSettings> response = Unirest.post(SERVER_ADDRESS + "ping")
-				.header("Content-Type", "application/json").body(new JSONObject(params)).asObject(ServerSettings.class);
-
-		if (response.isSuccess()) {
-			return response.getBody();
-		} else {
-			// unirest deserializes errors into an object with all null fields instead of a
-			// null object
-			return null;
-		}
-	}
-}

src/main/java/mdnet/base/ServerSettings.java

@@ -1,118 +0,0 @@
-package mdnet.base;
-
-import com.google.gson.annotations.SerializedName;
-
-import java.util.Objects;
-
-public final class ServerSettings {
-	@SerializedName("image_server")
-	private final String imageServer;
-	private final TlsCert tls;
-	@SerializedName("latest_build")
-	private final int latestBuild;
-	private final String url;
-	private final boolean compromised;
-
-	public ServerSettings(String imageServer, TlsCert tls, int latestBuild, String url, boolean compromised) {
-		this.imageServer = Objects.requireNonNull(imageServer);
-		this.tls = tls;
-		this.latestBuild = latestBuild;
-		this.url = url;
-		this.compromised = compromised;
-	}
-
-	public String getImageServer() {
-		return imageServer;
-	}
-
-	public TlsCert getTls() {
-		return tls;
-	}
-
-	public int getLatestBuild() {
-		return latestBuild;
-	}
-
-	@Override
-	public String toString() {
-		return "ServerSettings{" + "imageServer='" + imageServer + '\'' + ", tls=" + tls + ", latestBuild="
-				+ latestBuild + ", url='" + url + "', compromised=" + compromised + '}';
-	}
-
-	@Override
-	public boolean equals(Object o) {
-		if (this == o)
-			return true;
-		if (o == null || getClass() != o.getClass())
-			return false;
-
-		ServerSettings that = (ServerSettings) o;
-
-		if (!imageServer.equals(that.imageServer))
-			return false;
-		return Objects.equals(tls, that.tls);
-	}
-
-	@Override
-	public int hashCode() {
-		int result = imageServer.hashCode();
-		result = 31 * result + (tls != null ? tls.hashCode() : 0);
-		return result;
-	}
-
-	public static final class TlsCert {
-		@SerializedName("created_at")
-		private final String createdAt;
-		@SerializedName("private_key")
-		private final String privateKey;
-		private final String certificate;
-
-		public TlsCert(String createdAt, String privateKey, String certificate) {
-			this.createdAt = Objects.requireNonNull(createdAt);
-			this.privateKey = Objects.requireNonNull(privateKey);
-			this.certificate = Objects.requireNonNull(certificate);
-		}
-
-		public String getCreatedAt() {
-			return createdAt;
-		}
-
-		public String getPrivateKey() {
-			return privateKey;
-		}
-
-		public String getCertificate() {
-			return certificate;
-		}
-
-		@Override
-		public String toString() {
-			return "TlsCert{" + "createdAt='" + createdAt + '\'' + ", privateKey='" + "<hidden>" + '\''
-					+ ", certificate='" + "<hidden>" + '\'' + '}';
-		}
-
-		@Override
-		public boolean equals(Object o) {
-			if (this == o)
-				return true;
-			if (o == null || getClass() != o.getClass())
-				return false;
-
-			TlsCert tlsCert = (TlsCert) o;
-
-			if (!createdAt.equals(tlsCert.createdAt))
-				return false;
-			if (!privateKey.equals(tlsCert.privateKey))
-				return false;
-			return certificate.equals(tlsCert.certificate);
-		}
-
-		@Override
-		public int hashCode() {
-			int result = createdAt.hashCode();
-			result = 31 * result + privateKey.hashCode();
-			result = 31 * result + certificate.hashCode();
-			return result;
-		}
-	}
-}

src/main/kotlin/mdnet/base/Constants.kt

@@ -1,7 +1,6 @@
 package mdnet.base
 
-import com.google.gson.Gson
-import com.google.gson.GsonBuilder
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import java.time.Duration
 
 object Constants {
@@ -10,5 +9,5 @@ object Constants {
     const val WEBUI_VERSION = "0.1.1"
     val MAX_AGE_CACHE: Duration = Duration.ofDays(14)
     @JvmField
-    val GSON: Gson = GsonBuilder().setPrettyPrinting().create()
+    val JACKSON = jacksonObjectMapper()
 }

src/main/kotlin/mdnet/base/Main.kt

@@ -0,0 +1,103 @@
+package mdnet.base
+
+import com.fasterxml.jackson.core.JsonParseException
+import com.fasterxml.jackson.core.JsonProcessingException
+import com.fasterxml.jackson.databind.JsonMappingException
+import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException
+import com.fasterxml.jackson.module.kotlin.readValue
+import mdnet.base.Constants.JACKSON
+import mdnet.base.settings.ClientSettings
+import org.slf4j.LoggerFactory
+import java.io.FileReader
+import java.io.FileWriter
+import java.io.IOException
+import java.util.regex.Pattern
+import kotlin.system.exitProcess
+
+object Main {
+    private val LOGGER = LoggerFactory.getLogger(Main::class.java)
+
+    @JvmStatic
+    fun main(args: Array<String>) {
+        println(
+            "Mangadex@Home Client ${Constants.CLIENT_VERSION} (Build ${Constants.CLIENT_BUILD}) initializing"
+        )
+        println("Copyright (c) 2020, MangaDex Network")
+
+        var file = "settings.json"
+        if (args.size == 1) {
+            file = args[0]
+        } else if (args.isNotEmpty()) {
+            dieWithError("Expected one argument: path to config file, or nothing")
+        }
+
+        val settings: ClientSettings = try {
+            JACKSON.readValue<ClientSettings>(FileReader(file))
+        } catch (e: UnrecognizedPropertyException) {
+            dieWithError("'${e.propertyName}' is not a valid setting")
+        } catch (e: JsonProcessingException) {
+            dieWithError(e)
+        } catch (ignored: IOException) {
+            ClientSettings().also {
+                LOGGER.warn("Settings file {} not found, generating file", file)
+                try {
+                    FileWriter(file).use { writer -> JACKSON.writeValue(writer, it) }
+                } catch (e: IOException) {
+                    dieWithError(e)
+                }
+            }
+        }.apply(::validateSettings)
+
+        if (LOGGER.isInfoEnabled) {
+            LOGGER.info("Client settings loaded: {}", settings)
+        }
+        val client = MangaDexClient(settings)
+        Runtime.getRuntime().addShutdownHook(Thread { client.shutdown() })
+        client.runLoop()
+    }
+
+    @JvmStatic
+    fun dieWithError(e: Throwable): Nothing {
+        if (LOGGER.isErrorEnabled) {
+            LOGGER.error("Critical Error", e)
+        }
+        exitProcess(1)
+    }
+
+    @JvmStatic
+    fun dieWithError(error: String): Nothing {
+        if (LOGGER.isErrorEnabled) {
+            LOGGER.error("Critical Error: {}", error)
+        }
+        exitProcess(1)
+    }
+
+    private fun validateSettings(settings: ClientSettings) {
+        if (!isSecretValid(settings.clientSecret)) dieWithError("Config Error: API Secret is invalid, must be 52 alphanumeric characters")
+        if (settings.clientPort == 0) {
+            dieWithError("Config Error: Invalid port number")
+        }
+        if (settings.maxCacheSizeInMebibytes < 1024) {
+            dieWithError("Config Error: Invalid max cache size, must be >= 1024 MiB (1GiB)")
+        }
+        if (settings.threads < 4) {
+            dieWithError("Config Error: Invalid number of threads, must be >= 4")
+        }
+        if (settings.maxMebibytesPerHour < 0) {
+            dieWithError("Config Error: Max bandwidth must be >= 0")
+        }
+        if (settings.maxKilobitsPerSecond < 0) {
+            dieWithError("Config Error: Max burst rate must be >= 0")
+        }
+        if (settings.webSettings != null) {
+            if (settings.webSettings.uiPort == 0) {
+                dieWithError("Config Error: Invalid UI port number")
+            }
+        }
+    }
+
+    private const val CLIENT_KEY_LENGTH = 52
+    private fun isSecretValid(clientSecret: String): Boolean {
+        return Pattern.matches("^[a-zA-Z0-9]{$CLIENT_KEY_LENGTH}$", clientSecret)
+    }
+}

src/main/kotlin/mdnet/base/ServerHandler.kt

@@ -0,0 +1,93 @@
+package mdnet.base
+
+import com.fasterxml.jackson.databind.DeserializationFeature
+import com.fasterxml.jackson.module.kotlin.KotlinModule
+import mdnet.base.settings.ClientSettings
+import mdnet.base.settings.ServerSettings
+import org.http4k.client.ApacheClient
+import org.http4k.core.Body
+import org.http4k.core.Method
+import org.http4k.core.Request
+import org.http4k.format.ConfigurableJackson
+import org.http4k.format.asConfigurable
+import org.http4k.format.withStandardMappings
+import org.slf4j.LoggerFactory
+
+import mdnet.base.ServerHandlerJackson.auto
+object ServerHandlerJackson : ConfigurableJackson(
+    KotlinModule()
+    .asConfigurable()
+    .withStandardMappings()
+    .done()
+    .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
+)
+
+class ServerHandler(private val settings: ClientSettings) {
+    private val client = ApacheClient()
+
+    fun logoutFromControl(): Boolean {
+        if (LOGGER.isInfoEnabled) {
+            LOGGER.info("Disconnecting from the control server")
+        }
+        val params = mapOf<String, Any>(
+            "secret" to settings.clientSecret
+        )
+
+        val request = STRING_ANY_MAP_LENS(params, Request(Method.POST, SERVER_ADDRESS + "stop"))
+        val response = client(request)
+
+        return response.status.successful
+    }
+
+    private fun getPingParams(tlsCreatedAt: String? = null): Map<String, Any> =
+        mapOf<String, Any>(
+            "secret" to settings.clientSecret,
+            "port" to settings.clientPort,
+            "disk_space" to settings.maxCacheSizeInMebibytes * 1024 * 1024,
+            "network_speed" to settings.maxKilobitsPerSecond * 1000 / 8,
+            "build_version" to Constants.CLIENT_BUILD
+        ).let {
+            if (tlsCreatedAt != null) {
+                it.plus("tls_created_at" to tlsCreatedAt)
+            } else {
+                it
+            }
+        }
+
+    fun loginToControl(): ServerSettings? {
+        if (LOGGER.isInfoEnabled) {
+            LOGGER.info("Connecting to the control server")
+        }
+
+        val request = STRING_ANY_MAP_LENS(getPingParams(), Request(Method.POST, SERVER_ADDRESS + "ping"))
+        val response = client(request)
+
+        return if (response.status.successful) {
+            SERVER_SETTINGS_LENS(response)
+        } else {
+            null
+        }
+    }
+
+    fun pingControl(old: ServerSettings): ServerSettings? {
+        if (LOGGER.isInfoEnabled) {
+            LOGGER.info("Pinging the control server")
+        }
+
+        val request = STRING_ANY_MAP_LENS(getPingParams(old.tls!!.createdAt), Request(Method.POST, SERVER_ADDRESS + "ping"))
+        val response = client(request)
+
+        return if (response.status.successful) {
+            SERVER_SETTINGS_LENS(response)
+        } else {
+            null
+        }
+    }
+
+    companion object {
+        private val LOGGER = LoggerFactory.getLogger(ServerHandler::class.java)
+        private val STRING_ANY_MAP_LENS = Body.auto<Map<String, Any>>().toLens()
+        private val SERVER_SETTINGS_LENS = Body.auto<ServerSettings>().toLens()
+        private const val SERVER_ADDRESS = "https://api.mangadex.network/"
+    }
+}

src/main/kotlin/mdnet/base/Statistics.kt

@@ -1,12 +1,14 @@
 package mdnet.base
 
-import com.google.gson.annotations.SerializedName
+import com.fasterxml.jackson.databind.PropertyNamingStrategy
+import com.fasterxml.jackson.databind.annotation.JsonNaming
 
+@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy::class)
 data class Statistics(
-    @field:SerializedName("requests_served") val requestsServed: Int = 0,
-    @field:SerializedName("cache_hits") val cacheHits: Int = 0,
-    @field:SerializedName("cache_misses") val cacheMisses: Int = 0,
-    @field:SerializedName("browser_cached") val browserCached: Int = 0,
-    @field:SerializedName("bytes_sent") val bytesSent: Long = 0,
-    @field:SerializedName("bytes_on_disk") val bytesOnDisk: Long = 0
+    val requestsServed: Int = 0,
+    val cacheHits: Int = 0,
+    val cacheMisses: Int = 0,
+    val browserCached: Int = 0,
+    val bytesSent: Long = 0,
+    val bytesOnDisk: Long = 0
 )

src/main/kotlin/mdnet/base/netty/ApplicationNetty.kt

@@ -1,4 +1,4 @@
-package mdnet.base
+package mdnet.base.netty
 
 import io.netty.bootstrap.ServerBootstrap
 import io.netty.channel.ChannelFactory
@@ -19,7 +19,9 @@ import io.netty.handler.ssl.SslContextBuilder
 import io.netty.handler.stream.ChunkedWriteHandler
 import io.netty.handler.traffic.GlobalTrafficShapingHandler
 import io.netty.handler.traffic.TrafficCounter
+import mdnet.base.Statistics
 import mdnet.base.settings.ClientSettings
+import mdnet.base.settings.TlsCert
 import org.http4k.core.HttpHandler
 import org.http4k.server.Http4kChannelHandler
 import org.http4k.server.Http4kServer
@@ -38,7 +40,7 @@ import javax.net.ssl.SSLException
 
 private val LOGGER = LoggerFactory.getLogger("Application")
 
-class Netty(private val tls: ServerSettings.TlsCert, private val clientSettings: ClientSettings, private val statistics: AtomicReference<Statistics>) : ServerConfig {
+class Netty(private val tls: TlsCert, private val clientSettings: ClientSettings, private val statistics: AtomicReference<Statistics>) : ServerConfig {
     override fun toServer(httpHandler: HttpHandler): Http4kServer = object : Http4kServer {
         private val masterGroup = NioEventLoopGroup(clientSettings.threads)
         private val workerGroup = NioEventLoopGroup(clientSettings.threads)

src/main/kotlin/mdnet/base/netty/Keys.kt

@@ -19,7 +19,7 @@
 //LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 //SOFTWARE.
-package mdnet.base
+package mdnet.base.netty
 
 import java.io.ByteArrayOutputStream
 import java.security.KeyFactory
@@ -35,13 +35,23 @@ private const val PKCS_8_PEM_FOOTER = "-----END PRIVATE KEY-----"
 fun loadKey(keyDataString: String): PrivateKey? {
     if (keyDataString.contains(PKCS_1_PEM_HEADER)) {
         // OpenSSL / PKCS#1 Base64 PEM encoded file
-        val fixedString = keyDataString.replace(PKCS_1_PEM_HEADER, "").replace(PKCS_1_PEM_FOOTER, "")
-        return readPkcs1PrivateKey(base64Decode(fixedString))
+        val fixedString = keyDataString.replace(PKCS_1_PEM_HEADER, "").replace(
+            PKCS_1_PEM_FOOTER, "")
+        return readPkcs1PrivateKey(
+            base64Decode(
+                fixedString
+            )
+        )
     }
     if (keyDataString.contains(PKCS_8_PEM_HEADER)) {
         // PKCS#8 Base64 PEM encoded file
-        val fixedString = keyDataString.replace(PKCS_8_PEM_HEADER, "").replace(PKCS_8_PEM_FOOTER, "")
-        return readPkcs1PrivateKey(base64Decode(fixedString))
+        val fixedString = keyDataString.replace(PKCS_8_PEM_HEADER, "").replace(
+            PKCS_8_PEM_FOOTER, "")
+        return readPkcs1PrivateKey(
+            base64Decode(
+                fixedString
+            )
+        )
     }
 
     return null

src/main/kotlin/mdnet/base/netty/WebUiNetty.kt

@@ -1,4 +1,4 @@
-package mdnet.base
+package mdnet.base.netty
 
 import io.netty.bootstrap.ServerBootstrap
 import io.netty.channel.ChannelFactory

src/main/kotlin/mdnet/base/server/Application.kt

@@ -1,8 +1,8 @@
 /* ktlint-disable no-wildcard-imports */
 package mdnet.base.server
 
-import mdnet.base.Netty
-import mdnet.base.ServerSettings
+import mdnet.base.netty.Netty
+import mdnet.base.settings.ServerSettings
 import mdnet.base.Statistics
 import mdnet.base.settings.ClientSettings
 import mdnet.cache.DiskLruCache
@@ -21,7 +21,7 @@ fun getServer(cache: DiskLruCache, serverSettings: ServerSettings, clientSetting
     val database = Database.connect("jdbc:sqlite:cache/data.db", "org.sqlite.JDBC")
     val imageServer = ImageServer(cache, statistics, serverSettings.imageServer, database, isHandled)
 
-    return Timer
+    return timeRequest()
             .then(catchAllHideDetails())
             .then(ServerFilters.CatchLensFailure)
             .then(addCommonHeaders())
@@ -39,5 +39,5 @@ fun getServer(cache: DiskLruCache, serverSettings: ServerSettings, clientSetting
                     )
                 )
             )
-            .asServer(Netty(serverSettings.tls, clientSettings, statistics))
+            .asServer(Netty(serverSettings.tls!!, clientSettings, statistics))
 }

src/main/kotlin/mdnet/base/server/ImageServer.kt

@@ -200,8 +200,8 @@ class ImageServer(private val cache: DiskLruCache, private val statistics: Atomi
                         }
                         editor.commit()
                     } else {
-                        if (LOGGER.isInfoEnabled) {
-                            LOGGER.info("Cache download for $sanitizedUri aborted")
+                        if (LOGGER.isWarnEnabled) {
+                            LOGGER.warn("Cache download for $sanitizedUri aborted")
                         }
                         editor.abort()
                     }

src/main/kotlin/mdnet/base/server/WebUi.kt

@@ -4,7 +4,7 @@ package mdnet.base.server
 import java.time.Instant
 import java.util.concurrent.atomic.AtomicReference
 import mdnet.base.Statistics
-import mdnet.base.WebUiNetty
+import mdnet.base.netty.WebUiNetty
 import mdnet.base.settings.WebSettings
 import org.http4k.core.Body
 import org.http4k.core.Method
@@ -12,7 +12,7 @@ import org.http4k.core.Response
 import org.http4k.core.Status
 import org.http4k.core.then
 import org.http4k.filter.ServerFilters
-import org.http4k.format.Gson.auto
+import org.http4k.format.Jackson.auto
 import org.http4k.routing.ResourceLoader
 import org.http4k.routing.bind
 import org.http4k.routing.routes

src/main/kotlin/mdnet/base/server/common.kt

@@ -41,25 +41,24 @@ fun catchAllHideDetails(): Filter {
     }
 }
 
-val Timer = Filter {
-    next: HttpHandler -> {
-        request: Request ->
+fun timeRequest(): Filter {
+    return Filter { next: HttpHandler ->
+        { request: Request ->
             val start = System.currentTimeMillis()
             val response = next(request)
             val latency = System.currentTimeMillis() - start
             if (LOGGER.isTraceEnabled && response.header("X-Uri") != null) {
                 // Dirty hack to get sanitizedUri from ImageServer
                 val sanitizedUri = response.header("X-Uri")
-
                 // Log in TRACE
                 if (LOGGER.isInfoEnabled) {
                     LOGGER.info("Request for $sanitizedUri completed in ${latency}ms")
                 }
-
                 // Delete response header entirely
                 response.header("X-Uri", null)
             }
             // Set response header with processing times
             response.header("X-Time-Taken", latency.toString())
+        }
     }
 }

src/main/kotlin/mdnet/base/settings/ClientSettings.kt

@@ -1,20 +1,23 @@
 package mdnet.base.settings
 
-import com.google.gson.annotations.SerializedName
+import com.fasterxml.jackson.databind.PropertyNamingStrategy
+import com.fasterxml.jackson.databind.annotation.JsonNaming
 import dev.afanasev.sekret.Secret
 
+@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy::class)
 data class ClientSettings(
-    @field:SerializedName("max_cache_size_in_mebibytes") val maxCacheSizeInMebibytes: Long = 20480,
-    @field:SerializedName("max_mebibytes_per_hour") val maxMebibytesPerHour: Long = 0,
-    @field:SerializedName("max_kilobits_per_second") val maxKilobitsPerSecond: Long = 0,
-    @field:SerializedName("client_hostname") val clientHostname: String = "0.0.0.0",
-    @field:SerializedName("client_port") val clientPort: Int = 443,
-    @field:Secret @field:SerializedName("client_secret") val clientSecret: String = "PASTE-YOUR-SECRET-HERE",
-    @field:SerializedName("threads") val threads: Int = 4,
-    @field:SerializedName("web_settings") val webSettings: WebSettings? = null
+    val maxCacheSizeInMebibytes: Long = 20480,
+    val maxMebibytesPerHour: Long = 0,
+    val maxKilobitsPerSecond: Long = 0,
+    val clientHostname: String = "0.0.0.0",
+    val clientPort: Int = 443,
+    @field:Secret val clientSecret: String = "PASTE-YOUR-SECRET-HERE",
+    val threads: Int = 4,
+    val webSettings: WebSettings? = null
 )
 
+@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy::class)
 data class WebSettings(
-    @field:SerializedName("ui_hostname") val uiHostname: String = "127.0.0.1",
-    @field:SerializedName("ui_port") val uiPort: Int = 8080
+    val uiHostname: String = "127.0.0.1",
+    val uiPort: Int = 8080
 )

src/main/kotlin/mdnet/base/settings/ServerSettings.kt

@@ -0,0 +1,21 @@
+package mdnet.base.settings
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategy
+import com.fasterxml.jackson.databind.annotation.JsonNaming
+import dev.afanasev.sekret.Secret
+
+@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy::class)
+data class ServerSettings (
+    val imageServer: String,
+    val latestBuild: Int,
+    val url: String,
+    val compromised: Boolean,
+    val tls: TlsCert?
+)
+
+@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy::class)
+data class TlsCert (
+    val createdAt: String,
+    @field:Secret val privateKey: String,
+    @field:Secret val certificate: String
+)