💥 Nukes rust and replaces with kotlin

backend/.env

@@ -1,2 +0,0 @@
-DB_PATH=./db.sqlite
-API_KEY=p123

backend/.gitignore

@@ -1,25 +1,36 @@
-.env
+.gradle
-*.sqlite
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
 
-### Rust template
+### STS ###
-# Generated by Cargo
+.apt_generated
-# will have compiled files and executables
+.classpath
-debug/
+.factorypath
-target/
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+### IntelliJ IDEA ###
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+.idea
-#Cargo.lock
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
 
-# These are backup files generated by rustfmt
+### NetBeans ###
-**/*.rs.bk
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
 
-# MSVC Windows builds of rustc generate these, which store debugging information
+### VS Code ###
-*.pdb
+.vscode/
-
-# RustRover
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-.idea/

backend/Cargo.toml

@@ -1,11 +0,0 @@
-[package]
-name = "backend"
-version = "0.1.0"
-edition = "2024"
-
-[dependencies]
-rocket = { version = "0.5.0-rc.2", features = ["json"] }
-dotenv = "0.15.0"
-rusqlite = { version = "0.35.0", features = ["bundled"] }
-serde = { version = "1.0.147", features = ["derive"] }
-serde_json = "1.0.88"

backend/README.md

@@ -0,0 +1,51 @@
+# backend
+
+This project was created using the [Ktor Project Generator](https://start.ktor.io).
+
+Here are some useful links to get you started:
+
+- [Ktor Documentation](https://ktor.io/docs/home.html)
+- [Ktor GitHub page](https://github.com/ktorio/ktor)
+- The [Ktor Slack chat](https://app.slack.com/client/T09229ZC6/C0A974TJ9). You'll need
+  to [request an invite](https://surveys.jetbrains.com/s3/kotlin-slack-sign-up) to join.
+
+## Features
+
+Here's a list of features included in this project:
+
+| Name                                                                   | Description                                                                        |
+|------------------------------------------------------------------------|------------------------------------------------------------------------------------|
+| [CORS](https://start.ktor.io/p/cors)                                   | Enables Cross-Origin Resource Sharing (CORS)                                       |
+| [Routing](https://start.ktor.io/p/routing)                             | Provides a structured routing DSL                                                  |
+| [Authentication](https://start.ktor.io/p/auth)                         | Provides extension point for handling the Authorization header                     |
+| [Request Validation](https://start.ktor.io/p/request-validation)       | Adds validation for incoming requests                                              |
+| [Status Pages](https://start.ktor.io/p/status-pages)                   | Provides exception handling for routes                                             |
+| [Call Logging](https://start.ktor.io/p/call-logging)                   | Logs client requests                                                               |
+| [Content Negotiation](https://start.ktor.io/p/content-negotiation)     | Provides automatic content conversion according to Content-Type and Accept headers |
+| [kotlinx.serialization](https://start.ktor.io/p/kotlinx-serialization) | Handles JSON serialization using kotlinx.serialization library                     |
+| [Exposed](https://start.ktor.io/p/exposed)                             | Adds Exposed database to your application                                          |
+| [Rate Limiting](https://start.ktor.io/p/ktor-server-rate-limiting)     | Manage request rate limiting as you see fit                                        |
+| [Compression](https://start.ktor.io/p/compression)                     | Compresses responses using encoding algorithms like GZIP                           |
+| [Authentication Basic](https://start.ktor.io/p/auth-basic)             | Handles 'Basic' username / password authentication scheme                          |
+
+## Building & Running
+
+To build or run the project, use one of the following tasks:
+
+| Task                          | Description                                                          |
+|-------------------------------|----------------------------------------------------------------------|
+| `./gradlew test`              | Run the tests                                                        |
+| `./gradlew build`             | Build everything                                                     |
+| `buildFatJar`                 | Build an executable JAR of the server with all dependencies included |
+| `buildImage`                  | Build the docker image to use with the fat JAR                       |
+| `publishImageToLocalRegistry` | Publish the docker image locally                                     |
+| `run`                         | Run the server                                                       |
+| `runDocker`                   | Run using the local docker image                                     |
+
+If the server starts successfully, you'll see the following output:
+
+```
+2024-12-04 14:32:45.584 [main] INFO  Application - Application started in 0.303 seconds.
+2024-12-04 14:32:45.682 [main] INFO  Application - Responding at http://0.0.0.0:8080
+```
+

backend/build.gradle.kts

@@ -0,0 +1,43 @@
+val exposed_version: String by project
+val h2_version: String by project
+val kotlin_version: String by project
+val logback_version: String by project
+
+plugins {
+    kotlin("jvm") version "2.1.10"
+    id("io.ktor.plugin") version "3.1.3"
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.1.10"
+}
+
+group = "svitan.dev"
+version = "0.0.1"
+
+application {
+    mainClass = "svitan.dev.ApplicationKt"
+}
+
+repositories {
+    mavenCentral()
+    maven { url = uri("https://packages.confluent.io/maven/") }
+}
+
+dependencies {
+    implementation("io.ktor:ktor-server-cors")
+    implementation("io.ktor:ktor-server-core")
+    implementation("io.ktor:ktor-server-auth")
+    implementation("io.ktor:ktor-server-request-validation")
+    implementation("io.ktor:ktor-server-host-common")
+    implementation("io.ktor:ktor-server-status-pages")
+    implementation("io.ktor:ktor-server-call-logging")
+    implementation("io.ktor:ktor-server-content-negotiation")
+    implementation("io.ktor:ktor-serialization-kotlinx-json")
+    implementation("org.jetbrains.exposed:exposed-core:$exposed_version")
+    implementation("org.jetbrains.exposed:exposed-jdbc:$exposed_version")
+    implementation("com.h2database:h2:$h2_version")
+    implementation("io.github.flaxoos:ktor-server-rate-limiting:2.2.1")
+    implementation("io.ktor:ktor-server-compression")
+    implementation("io.ktor:ktor-server-netty")
+    implementation("ch.qos.logback:logback-classic:$logback_version")
+    testImplementation("io.ktor:ktor-server-test-host")
+    testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")
+}

backend/gradle.properties

@@ -0,0 +1,6 @@
+kotlin.code.style=official
+exposed_version=0.61.0
+h2_version=2.3.232
+kotlin_version=2.1.10
+ktor_version=3.1.3
+logback_version=1.4.14

backend/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

backend/gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

backend/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

backend/settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "backend"

backend/src/auth.rs

@@ -1,56 +0,0 @@
-use rocket::Response;
-use rocket::http::Status;
-use rocket::request::{FromRequest, Outcome, Request};
-use serde::Serialize;
-use serde_json::json;
-use std::io::Cursor;
-
-pub struct ApiKey {}
-
-#[derive(Serialize)]
-pub struct GenericResponse {
-    pub message: String,
-}
-
-#[rocket::async_trait]
-impl<'r> FromRequest<'r> for ApiKey {
-    type Error = Response<'r>;
-
-    async fn from_request(req: &'r Request<'_>) -> Outcome<Self, Response<'r>> {
-        fn is_valid(key: &str) -> bool {
-            key == dotenv::var("API_KEY").unwrap()
-        }
-
-        match req.headers().get_one("Authorization") {
-            None => {
-                let body = json!(GenericResponse {
-                    message: "auth token not found".to_string()
-                })
-                .to_string();
-
-                Outcome::Error((
-                    Status::Unauthorized,
-                    Response::build()
-                        .status(Status::Unauthorized)
-                        .sized_body(body.len(), Cursor::new(body))
-                        .finalize(),
-                ))
-            }
-            Some(key) if is_valid(key) => Outcome::Success(ApiKey {}),
-            Some(_) => {
-                let body = json!(GenericResponse {
-                    message: "invalid auth token".to_string()
-                })
-                .to_string();
-
-                Outcome::Error((
-                    Status::Unauthorized,
-                    Response::build()
-                        .status(Status::Unauthorized)
-                        .sized_body(body.len(), Cursor::new(body))
-                        .finalize(),
-                ))
-            }
-        }
-    }
-}

backend/src/db.rs

@@ -1,83 +0,0 @@
-use rusqlite::{Connection, Error};
-
-#[derive(Debug)]
-pub enum ActionKind {
-    Text,
-    Script,
-}
-
-impl ActionKind {
-    fn parse(kind: String) -> Result<ActionKind, Error> {
-        match kind.to_lowercase().as_str() {
-            "text" => Ok(ActionKind::Text),
-            "script" => Ok(ActionKind::Script),
-            _ => Err(Error::QueryReturnedNoRows),
-        }
-    }
-
-    fn stringify(&self) -> String {
-        match self {
-            ActionKind::Text => "text".to_string(),
-            ActionKind::Script => "script".to_string(),
-        }
-    }
-}
-
-#[derive(Debug)]
-pub struct Action {
-    id: i32,
-    name: String,
-    kind: ActionKind,
-    source: String,
-    created_at: String,
-    updated_at: String,
-}
-
-pub struct Conn {
-    conn: Connection,
-}
-
-impl Conn {
-    pub fn new(db_path: &str) -> Result<Conn, Error> {
-        let conn = Connection::open(db_path).expect("failed to open database");
-
-        conn.execute(
-            "CREATE TABLE action (
-            id          INTEGER PRIMARY KEY,
-            name        TEXT NOT NULL,
-            kind        TEXT NOT NULL,
-            source      TEXT NOT NULL,
-            created_at  TEXT NOT NULL,
-            updated_at  TEXT NOT NULL
-        )",
-            (), // empty list of parameters.
-        )?;
-
-        Ok(Conn { conn })
-    }
-
-    fn action_by_id(self, id: i32) -> Result<Action, Error> {
-        let mut query = self.conn.prepare("SELECT * FROM action WHERE id = ?")?;
-        let mut actions = query.query_map(&[&id], |row| {
-            Ok(Action {
-                id: row.get(0)?,
-                name: row.get(1)?,
-                kind: ActionKind::parse(row.get(2)?)?,
-                source: row.get(3)?,
-                created_at: row.get(4)?,
-                updated_at: row.get(5)?,
-            })
-        })?;
-
-        let action = actions.next();
-        let len = actions.next().unwrap().iter().count();
-        if len != 0 {
-            return Err(Error::InvalidQuery);
-        }
-
-        if let None = action {
-            return Err(Error::QueryReturnedNoRows);
-        }
-        action.unwrap()
-    }
-}

backend/src/main.rs

@@ -1,28 +0,0 @@
-mod db;
-mod auth;
-
-use dotenv;
-use auth::ApiKey;
-
-#[macro_use]
-extern crate rocket;
-
-#[get("/")]
-async fn index() -> &'static str {
-    "Hello World!"
-}
-
-#[get("/hi")]
-async fn hello(api_key: ApiKey) -> &'static str {
-    "Hi!"
-}
-
-#[launch]
-fn rocket() -> _ {
-    dotenv::dotenv().ok();
-    let db_path = dotenv::var("DB_PATH").expect("DB_PATH is not set");
-    dotenv::var("API_KEY").expect("API_KEY is not set");
-    let db = db::Conn::new(&db_path);
-
-    rocket::build().mount("/", routes![index, hello])
-}

backend/src/main/kotlin/Administration.kt

@@ -0,0 +1,35 @@
+package svitan.dev
+
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.*
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.implementations.*
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.plugins.calllogging.*
+import io.ktor.server.plugins.compression.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.requestvalidation.RequestValidation
+import io.ktor.server.plugins.requestvalidation.ValidationResult
+import io.ktor.server.plugins.statuspages.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlin.time.Duration.Companion.seconds
+import org.jetbrains.exposed.sql.*
+import org.slf4j.event.*
+
+fun Application.configureAdministration() {
+    routing {
+        route("/") {
+            install(RateLimiting) {
+                rateLimiter {
+                    type = TokenBucket::class
+                    capacity = 100
+                    rate = 10.seconds
+                }
+            }
+        }
+    }
+}

backend/src/main/kotlin/Application.kt

@@ -0,0 +1,20 @@
+package svitan.dev
+
+import io.ktor.server.application.*
+import io.ktor.server.engine.*
+import io.ktor.server.netty.*
+
+fun main() {
+    embeddedServer(Netty, port = 8080, host = "0.0.0.0", module = Application::module)
+        .start(wait = true)
+}
+
+fun Application.module() {
+    configureHTTP()
+    configureSecurity()
+    configureMonitoring()
+    configureSerialization()
+    configureDatabases()
+    configureAdministration()
+    configureRouting()
+}

backend/src/main/kotlin/Databases.kt

@@ -0,0 +1,65 @@
+package svitan.dev
+
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.*
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.implementations.*
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.plugins.calllogging.*
+import io.ktor.server.plugins.compression.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.requestvalidation.RequestValidation
+import io.ktor.server.plugins.requestvalidation.ValidationResult
+import io.ktor.server.plugins.statuspages.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlin.time.Duration.Companion.seconds
+import org.jetbrains.exposed.sql.*
+import org.slf4j.event.*
+
+fun Application.configureDatabases() {
+    val database = Database.connect(
+        url = "jdbc:h2:mem:test;DB_CLOSE_DELAY=-1",
+        user = "root",
+        driver = "org.h2.Driver",
+        password = "",
+    )
+    val userService = UserService(database)
+    routing {
+        // Create user
+        post("/users") {
+            val user = call.receive<ExposedUser>()
+            val id = userService.create(user)
+            call.respond(HttpStatusCode.Created, id)
+        }
+
+        // Read user
+        get("/users/{id}") {
+            val id = call.parameters["id"]?.toInt() ?: throw IllegalArgumentException("Invalid ID")
+            val user = userService.read(id)
+            if (user != null) {
+                call.respond(HttpStatusCode.OK, user)
+            } else {
+                call.respond(HttpStatusCode.NotFound)
+            }
+        }
+
+        // Update user
+        put("/users/{id}") {
+            val id = call.parameters["id"]?.toInt() ?: throw IllegalArgumentException("Invalid ID")
+            val user = call.receive<ExposedUser>()
+            userService.update(id, user)
+            call.respond(HttpStatusCode.OK)
+        }
+
+        // Delete user
+        delete("/users/{id}") {
+            val id = call.parameters["id"]?.toInt() ?: throw IllegalArgumentException("Invalid ID")
+            userService.delete(id)
+            call.respond(HttpStatusCode.OK)
+        }
+    }
+}

backend/src/main/kotlin/HTTP.kt

@@ -0,0 +1,34 @@
+package svitan.dev
+
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.*
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.implementations.*
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.plugins.calllogging.*
+import io.ktor.server.plugins.compression.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.requestvalidation.RequestValidation
+import io.ktor.server.plugins.requestvalidation.ValidationResult
+import io.ktor.server.plugins.statuspages.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlin.time.Duration.Companion.seconds
+import org.jetbrains.exposed.sql.*
+import org.slf4j.event.*
+
+fun Application.configureHTTP() {
+    install(CORS) {
+        allowMethod(HttpMethod.Options)
+        allowMethod(HttpMethod.Put)
+        allowMethod(HttpMethod.Delete)
+        allowMethod(HttpMethod.Patch)
+        allowHeader(HttpHeaders.Authorization)
+        allowHeader("MyCustomHeader")
+        anyHost() // @TODO: Don't do this in production if possible. Try to limit it.
+    }
+    install(Compression)
+}

backend/src/main/kotlin/Monitoring.kt

@@ -0,0 +1,28 @@
+package svitan.dev
+
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.*
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.implementations.*
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.plugins.calllogging.*
+import io.ktor.server.plugins.compression.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.requestvalidation.RequestValidation
+import io.ktor.server.plugins.requestvalidation.ValidationResult
+import io.ktor.server.plugins.statuspages.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlin.time.Duration.Companion.seconds
+import org.jetbrains.exposed.sql.*
+import org.slf4j.event.*
+
+fun Application.configureMonitoring() {
+    install(CallLogging) {
+        level = Level.INFO
+        filter { call -> call.request.path().startsWith("/") }
+    }
+}

backend/src/main/kotlin/Routing.kt

@@ -0,0 +1,41 @@
+package svitan.dev
+
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.*
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.implementations.*
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.plugins.calllogging.*
+import io.ktor.server.plugins.compression.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.requestvalidation.RequestValidation
+import io.ktor.server.plugins.requestvalidation.ValidationResult
+import io.ktor.server.plugins.statuspages.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlin.time.Duration.Companion.seconds
+import org.jetbrains.exposed.sql.*
+import org.slf4j.event.*
+
+fun Application.configureRouting() {
+    install(RequestValidation) {
+        validate<String> { bodyText ->
+            if (!bodyText.startsWith("Hello"))
+                ValidationResult.Invalid("Body text should start with 'Hello'")
+            else ValidationResult.Valid
+        }
+    }
+    install(StatusPages) {
+        exception<Throwable> { call, cause ->
+            call.respondText(text = "500: $cause", status = HttpStatusCode.InternalServerError)
+        }
+    }
+    routing {
+        get("/") {
+            call.respondText("Hello World!")
+        }
+    }
+}

backend/src/main/kotlin/Security.kt

@@ -0,0 +1,58 @@
+package svitan.dev
+
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.*
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.implementations.*
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.plugins.calllogging.*
+import io.ktor.server.plugins.compression.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.requestvalidation.RequestValidation
+import io.ktor.server.plugins.requestvalidation.ValidationResult
+import io.ktor.server.plugins.statuspages.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlin.time.Duration.Companion.seconds
+import org.jetbrains.exposed.sql.*
+import org.slf4j.event.*
+
+fun Application.configureSecurity() {
+    authentication {
+        basic(name = "myauth1") {
+            realm = "Ktor Server"
+            validate { credentials ->
+                if (credentials.name == credentials.password) {
+                    UserIdPrincipal(credentials.name)
+                } else {
+                    null
+                }
+            }
+        }
+
+        form(name = "myauth2") {
+            userParamName = "user"
+            passwordParamName = "password"
+            challenge {
+                /**/
+            }
+        }
+    }
+    routing {
+        authenticate("myauth1") {
+            get("/protected/route/basic") {
+                val principal = call.principal<UserIdPrincipal>()!!
+                call.respondText("Hello ${principal.name}")
+            }
+        }
+        authenticate("myauth2") {
+            get("/protected/route/form") {
+                val principal = call.principal<UserIdPrincipal>()!!
+                call.respondText("Hello ${principal.name}")
+            }
+        }
+    }
+}

backend/src/main/kotlin/Serialization.kt

@@ -0,0 +1,29 @@
+package svitan.dev
+
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.*
+import io.github.flaxoos.ktor.server.plugins.ratelimiter.implementations.*
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.plugins.calllogging.*
+import io.ktor.server.plugins.compression.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.requestvalidation.RequestValidation
+import io.ktor.server.plugins.requestvalidation.ValidationResult
+import io.ktor.server.plugins.statuspages.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlin.time.Duration.Companion.seconds
+import org.jetbrains.exposed.sql.*
+import org.slf4j.event.*
+
+fun Application.configureSerialization() {
+    routing {
+        get("/json/kotlinx-serialization") {
+            call.respond(mapOf("hello" to "world"))
+        }
+    }
+}

backend/src/main/kotlin/UsersSchema.kt

@@ -0,0 +1,62 @@
+package svitan.dev
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.serialization.Serializable
+import org.jetbrains.exposed.sql.*
+import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
+import org.jetbrains.exposed.sql.transactions.experimental.newSuspendedTransaction
+import org.jetbrains.exposed.sql.transactions.transaction
+
+@Serializable
+data class ExposedUser(val name: String, val age: Int)
+
+class UserService(database: Database) {
+    object Users : Table() {
+        val id = integer("id").autoIncrement()
+        val name = varchar("name", length = 50)
+        val age = integer("age")
+
+        override val primaryKey = PrimaryKey(id)
+    }
+
+    init {
+        transaction(database) {
+            SchemaUtils.create(Users)
+        }
+    }
+
+    suspend fun create(user: ExposedUser): Int = dbQuery {
+        Users.insert {
+            it[name] = user.name
+            it[age] = user.age
+        }[Users.id]
+    }
+
+    suspend fun read(id: Int): ExposedUser? {
+        return dbQuery {
+            Users.selectAll()
+                .where { Users.id eq id }
+                .map { ExposedUser(it[Users.name], it[Users.age]) }
+                .singleOrNull()
+        }
+    }
+
+    suspend fun update(id: Int, user: ExposedUser) {
+        dbQuery {
+            Users.update({ Users.id eq id }) {
+                it[name] = user.name
+                it[age] = user.age
+            }
+        }
+    }
+
+    suspend fun delete(id: Int) {
+        dbQuery {
+            Users.deleteWhere { Users.id.eq(id) }
+        }
+    }
+
+    private suspend fun <T> dbQuery(block: suspend () -> T): T =
+        newSuspendedTransaction(Dispatchers.IO) { block() }
+}
+

backend/src/main/resources/logback.xml

@@ -0,0 +1,12 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="org.eclipse.jetty" level="INFO"/>
+    <logger name="io.netty" level="INFO"/>
+</configuration>

backend/src/test/kotlin/ApplicationTest.kt

@@ -0,0 +1,21 @@
+package svitan.dev
+
+import io.ktor.client.request.*
+import io.ktor.http.*
+import io.ktor.server.testing.*
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class ApplicationTest {
+
+    @Test
+    fun testRoot() = testApplication {
+        application {
+            module()
+        }
+        client.get("/").apply {
+            assertEquals(HttpStatusCode.OK, status)
+        }
+    }
+
+}