Initial files and some experimenting

src/main/kotlin/Application.kt

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+package codes.kalar
+
+import io.ktor.server.application.*
+
+fun main(args: Array<String>) {
+    io.ktor.server.netty.EngineMain.main(args)
+}
+
+fun Application.module() {
+    configureHTTP()
+    configureSecurity()
+    configureSerialization()
+    configureDatabases()
+    configureRouting()
+}

src/main/kotlin/CitySchema.kt

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+package codes.kalar
+
+import kotlinx.coroutines.*
+import kotlinx.serialization.Serializable
+import java.sql.Connection
+import java.sql.Statement
+
+@Serializable
+data class City(val name: String, val population: Int)
+class CityService(private val connection: Connection) {
+    companion object {
+        private const val CREATE_TABLE_CITIES =
+            "CREATE TABLE CITIES (ID SERIAL PRIMARY KEY, NAME VARCHAR(255), POPULATION INT);"
+        private const val SELECT_CITY_BY_ID = "SELECT name, population FROM cities WHERE id = ?"
+        private const val INSERT_CITY = "INSERT INTO cities (name, population) VALUES (?, ?)"
+        private const val UPDATE_CITY = "UPDATE cities SET name = ?, population = ? WHERE id = ?"
+        private const val DELETE_CITY = "DELETE FROM cities WHERE id = ?"
+
+    }
+
+    init {
+        val statement = connection.createStatement()
+        statement.executeUpdate(CREATE_TABLE_CITIES)
+    }
+
+    private var newCityId = 0
+
+    // Create new city
+    suspend fun create(city: City): Int = withContext(Dispatchers.IO) {
+        val statement = connection.prepareStatement(INSERT_CITY, Statement.RETURN_GENERATED_KEYS)
+        statement.setString(1, city.name)
+        statement.setInt(2, city.population)
+        statement.executeUpdate()
+
+        val generatedKeys = statement.generatedKeys
+        if (generatedKeys.next()) {
+            return@withContext generatedKeys.getInt(1)
+        } else {
+            throw Exception("Unable to retrieve the id of the newly inserted city")
+        }
+    }
+
+    // Read a city
+    suspend fun read(id: Int): City = withContext(Dispatchers.IO) {
+        val statement = connection.prepareStatement(SELECT_CITY_BY_ID)
+        statement.setInt(1, id)
+        val resultSet = statement.executeQuery()
+
+        if (resultSet.next()) {
+            val name = resultSet.getString("name")
+            val population = resultSet.getInt("population")
+            return@withContext City(name, population)
+        } else {
+            throw Exception("Record not found")
+        }
+    }
+
+    // Update a city
+    suspend fun update(id: Int, city: City) = withContext(Dispatchers.IO) {
+        val statement = connection.prepareStatement(UPDATE_CITY)
+        statement.setString(1, city.name)
+        statement.setInt(2, city.population)
+        statement.setInt(3, id)
+        statement.executeUpdate()
+    }
+
+    // Delete a city
+    suspend fun delete(id: Int) = withContext(Dispatchers.IO) {
+        val statement = connection.prepareStatement(DELETE_CITY)
+        statement.setInt(1, id)
+        statement.executeUpdate()
+    }
+}
+

src/main/kotlin/Databases.kt

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+package codes.kalar
+
+import com.auth0.jwt.JWT
+import com.auth0.jwt.algorithms.Algorithm
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.auth.jwt.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.defaultheaders.*
+import io.ktor.server.plugins.swagger.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import java.sql.Connection
+import java.sql.DriverManager
+
+fun Application.configureDatabases() {
+    val dbConnection: Connection = connectToPostgres()
+
+    routing {
+        get("/database") {
+            var title = mutableListOf<String>()
+            // FUZZY SEARCH!!!!
+            val statement = dbConnection.prepareStatement("SELECT title FROM collection_item WHERE levenshtein(title, ?) <= 10 LIMIT 20")
+            statement.setString(1, "An Absolutely Remarkable Thing")
+            val resultSet = statement.executeQuery()
+            while (resultSet.next()) {
+                title.addLast(resultSet.getString("title") + "\n")
+            }
+            call.respond(title.toString() ?: "No data found")
+        }
+    }
+}
+
+/**
+ * Makes a connection to a Postgres database.
+ *
+ * In order to connect to your running Postgres process,
+ * please specify the following parameters in your configuration file:
+ * - postgres.url -- Url of your running database process.
+ * - postgres.user -- Username for database connection
+ * - postgres.password -- Password for database connection
+ *
+ * If you don't have a database process running yet, you may need to [download]((https://www.postgresql.org/download/))
+ * and install Postgres and follow the instructions [here](https://postgresapp.com/).
+ * Then, you would be able to edit your url,  which is usually "jdbc:postgresql://host:port/database", as well as
+ * user and password values.
+ *
+ *
+ * @param embedded -- if [true] defaults to an embedded database for tests that runs locally in the same process.
+ * In this case you don't have to provide any parameters in configuration file, and you don't have to run a process.
+ *
+ * @return [Connection] that represent connection to the database. Please, don't forget to close this connection when
+ * your application shuts down by calling [Connection.close]
+ * */
+fun Application.connectToPostgres(embedded: Boolean = false): Connection {
+    Class.forName("org.postgresql.Driver")
+    if (embedded) {
+        log.info("Using embedded H2 database for testing; replace this flag to use postgres")
+        return DriverManager.getConnection("jdbc:h2:mem:test;DB_CLOSE_DELAY=-1", "root", "")
+    } else {
+        val url = environment.config.property("postgres.url").getString()
+        log.info("Connecting to postgres database at $url")
+        val user = environment.config.property("postgres.user").getString()
+        val password = environment.config.property("postgres.password").getString()
+
+        return DriverManager.getConnection(url, user, password)
+    }
+}

src/main/kotlin/HTTP.kt

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+package codes.kalar
+
+import com.auth0.jwt.JWT
+import com.auth0.jwt.algorithms.Algorithm
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.auth.jwt.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.defaultheaders.*
+import io.ktor.server.plugins.swagger.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import java.sql.Connection
+import java.sql.DriverManager
+
+fun Application.configureHTTP() {
+    install(DefaultHeaders) {
+        header("X-Engine", "Ktor") // will send this header with each response
+    }
+    routing {
+        swaggerUI(path = "openapi")
+    }
+}

src/main/kotlin/Routing.kt

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+package codes.kalar
+
+import com.auth0.jwt.JWT
+import com.auth0.jwt.algorithms.Algorithm
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.auth.jwt.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.defaultheaders.*
+import io.ktor.server.plugins.swagger.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import java.sql.Connection
+import java.sql.DriverManager
+
+fun Application.configureRouting() {
+    routing {
+        get("/") {
+            call.respondText("Hello World!")
+        }
+
+        get("/patron") {
+            if (call.request.queryParameters.isEmpty()) {
+                call.respond(HttpStatusCode.BadRequest, "Invalid parameters")
+            }
+            else {
+                call.respondText("Hello, ${call.request.queryParameters["patron"]}")
+            }
+        }
+
+        post("/patron") {
+            call.respondText("Patron is posted")
+        }
+
+        delete("/patron") {
+            call.respondText("Do you have permissions?")
+        }
+
+        get("/libraries") {
+            call.respondText("Libraries are neat!")
+        }
+
+        post("/libraries") {
+            call.respondText("Library is posted")
+        }
+
+        delete("/libraries/{id}") {
+            call.respondText("We hate to see you go!")
+        }
+
+        get("/items") {
+            call.respondText("I'll search for that book!")
+        }
+
+        post("/items") {
+            call.respondText("Somebody got back from Barnes & Noble!")
+        }
+
+        delete("/items/{id}") {
+            call.respondText(":(")
+        }
+
+        get("/libraries/{libraryId}/items/{itemId}") {
+            call.respondText("You asked for ${call.parameters["itemId"]} from ${call.parameters["libraryId"]}")
+        }
+
+        get("/authenticate") {
+            call.respondText(System.getenv("JWT_DOMAIN") ?: "Ain't life a bitch?")
+        }
+    }
+}

src/main/kotlin/Security.kt

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+package codes.kalar
+
+import java.io.File
+import java.util.Properties
+import com.auth0.jwt.JWT
+import com.auth0.jwt.algorithms.Algorithm
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.auth.jwt.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.defaultheaders.*
+import io.ktor.server.plugins.swagger.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import java.sql.Connection
+import java.sql.DriverManager
+
+fun Application.configureSecurity() {
+    // Please read the jwt property from the config file if you are using EngineMain
+    val jwtAudience = environment.config.property("jwt.audience").toString()
+    val jwtDomain = environment.config.property("jwt.domain").toString()
+    val jwtRealm = "ktor sample app"
+    val jwtSecret = environment.config.property("jwt.secret").toString()
+
+    authentication {
+        jwt {
+            realm = jwtRealm
+            verifier(
+                JWT
+                    .require(Algorithm.HMAC256(jwtSecret))
+                    .withAudience(jwtAudience)
+                    .withIssuer(jwtDomain)
+                    .build()
+            )
+            validate { credential ->
+                if (credential.payload.audience.contains(jwtAudience)) JWTPrincipal(credential.payload) else null
+            }
+        }
+    }
+}

src/main/kotlin/Serialization.kt

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+package codes.kalar
+
+import com.auth0.jwt.JWT
+import com.auth0.jwt.algorithms.Algorithm
+import io.ktor.http.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.auth.jwt.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.defaultheaders.*
+import io.ktor.server.plugins.swagger.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import java.sql.Connection
+import java.sql.DriverManager
+
+fun Application.configureSerialization() {
+    routing {
+        get("/json/kotlinx-serialization") {
+            call.respond(mapOf("hello" to "world"))
+        }
+    }
+}

src/main/kotlin/model/CheckedOutItem.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class CheckedOutItem(
+    val id: Long,
+    val itemId: Long,
+    val patronId: Long,
+    val dueDate: String,
+)

src/main/kotlin/model/CollectionItem.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class CollectionItem(
+    val id: Long,
+    val title: String?,
+    val author: String?,
+    val publisher: String?,
+    val publishingDate: String?,
+    val locNumber: String?,
+    val deweyDecimalNumber: String?,
+    val isbn: Int?,
+    val sortTitle: String?,
+    val format: String?,
+    val language: String?,
+    val pageCount: Int?,
+    val category: String?,
+    val description: String?,
+    val priceInCents: Int?,
+    val coverImageUri: String?,
+    val isCheckedIn: Boolean,
+    val isArchived: Boolean,
+    val isLost: Boolean,
+    val lostDate: String?,
+)

src/main/kotlin/model/LateItem.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class LateItem(
+    val id: Long,
+    val itemId: Long,
+    val patronId: Long,
+    val dueDate: String,
+    var freeInCents: Int,
+)

src/main/kotlin/model/Library.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class Library(
+    val id: Long,
+    val name: String,
+    val address: String,
+)

src/main/kotlin/model/LibraryCollection.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class LibraryCollection(
+    val id: Long,
+    val libraryId: Long,
+    val itemId: Long,
+)

src/main/kotlin/model/LostItem.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class LostItem(
+    val id: Long,
+    val itemId: Long,
+    val patronId: Long,
+    val dueDate: String,
+    val costInCents: Int,
+)

src/main/kotlin/model/OnHoldItem.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class OnHoldItem(
+    val id: Long,
+    val itemId: Long,
+    val patronId: Long,
+    val holdReleaseDate: String,
+)

src/main/kotlin/model/Patron.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class Patron(
+    val id: Long,
+    val name: String,
+    val hasGoodStanding: Boolean,
+    val feeTotal: Long,
+    val isArchived: Boolean,
+    val lastLogin: String?,
+    val password: String?,
+)

src/main/kotlin/model/Staff.kt

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+package codes.kalar.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class Staff(
+    val id: Long,
+    val name: String,
+    val password: String?,
+    val isArchived: Boolean,
+)

src/main/kotlin/service/CollectionItemService.kt

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+package codes.kalar.service
+
+import codes.kalar.model.CollectionItem
+import kotlinx.coroutines.*
+import kotlinx.serialization.Serializable
+import java.sql.Connection
+import java.sql.Statement
+
+class CollectionItemService(private val connection: Connection) {
+    var pageOfItems = mutableListOf<CollectionItem>()
+    companion object {
+        // TODO add create table statement
+        private const val CREATE_COLLECTION_ITEMS_TABLE = "CREATE TABLE IF NOT EXISTS collection_items ("
+        private const val SELECT_ITEM_BY_TITLE = "SELECT * FROM collection_items WHERE title = ? limit 10"
+        private const val INSERT_ITEM = "INSERT INTO collection_items (name, population) VALUES (?, ?)"
+        private const val UPDATE_ITEM = "UPDATE collection_items SET name = ?, population = ? WHERE id = ?"
+        private const val DELETE_ITEM = "DELETE FROM collection_items WHERE id = ?"
+    }
+
+    init {
+        val statement = connection.createStatement()
+        val tables = connection.metaData.getTables(null, "public", "collection_items", arrayOf("TABLE"))
+        if (!tables.next()) {
+            statement.executeUpdate(CREATE_COLLECTION_ITEMS_TABLE)
+        }
+    }
+
+    suspend fun create(collectionItem: CollectionItem) {}
+
+    suspend fun read(collectionItem: CollectionItem) {}
+
+    suspend fun update(collectionItem: CollectionItem) {}
+
+    suspend fun delete(collectionItem: CollectionItem) {}
+}

src/main/resources/logback.xml

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+<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>

src/main/resources/openapi/documentation.yaml

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+openapi: "3.0.3"
+info:
+  title: "Application API"
+  description: "Application API"
+  version: "1.0.0"
+servers:
+  - url: "http://0.0.0.0:8080"
+paths:
+  /:
+    get:
+      description: "Hello World!"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            text/plain:
+              schema:
+                type: "string"
+              examples:
+                Example#1:
+                  value: "Hello World!"
+components:
+  schemas: { }

src/test/kotlin/ApplicationTest.kt

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+package codes.kalar
+
+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)
+        }
+    }
+
+}