Add web upload

build.gradle.kts

@@ -17,16 +17,21 @@ val ktorVersion = "1.2.4"
 repositories {
     mavenCentral()
     jcenter()
+    maven { url = uri("https://dl.bintray.com/kotlin/ktor") }
+    maven { url = uri("https://dl.bintray.com/kotlin/kotlin-js-wrappers") }
 }
 
 dependencies {
     implementation(kotlin("stdlib-jdk8"))
     implementation("io.ktor:ktor-server-netty:$ktorVersion")
     implementation("io.ktor:ktor-locations:$ktorVersion")
+    implementation("io.ktor:ktor-server-core:$ktorVersion")
+    implementation("io.ktor:ktor-html-builder:$ktorVersion")
     implementation("org.jetbrains.exposed:exposed:0.17.3")
+    implementation("org.jetbrains:kotlin-css-jvm:1.0.0-pre.83-kotlin-1.3.50")
     implementation("org.mariadb.jdbc:mariadb-java-client:2.4.4")
 }
 
 tasks.withType<KotlinCompile> {
     kotlinOptions.jvmTarget = "1.8"
-}
+}

src/main/kotlin/moe/kageru/kodeshare/Kodeshare.kt

@@ -2,12 +2,14 @@ package moe.kageru.kodeshare
 
 import io.ktor.application.install
 import io.ktor.features.DefaultHeaders
+import io.ktor.locations.KtorExperimentalLocationsAPI
 import io.ktor.locations.Locations
 import io.ktor.routing.routing
 import io.ktor.server.engine.embeddedServer
 import io.ktor.server.netty.Netty
 import moe.kageru.kodeshare.Routes.createRoutes
 
+@KtorExperimentalLocationsAPI
 @ExperimentalStdlibApi
 fun main() {
     embeddedServer(Netty, 9092) {

src/main/kotlin/moe/kageru/kodeshare/Log.kt

@@ -20,6 +20,10 @@ object Log {
     fun info(message: String) {
         log.info(message)
     }
+
+    fun warn(message: String) {
+        log.warning(message)
+    }
 }
 
 private class LogFormatter : Formatter() {

src/main/kotlin/moe/kageru/kodeshare/Routes.kt

@@ -3,63 +3,89 @@ package moe.kageru.kodeshare
 import io.ktor.application.ApplicationCall
 import io.ktor.application.call
 import io.ktor.http.ContentType
+import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpStatusCode
 import io.ktor.http.content.PartData
 import io.ktor.http.content.forEachPart
 import io.ktor.http.content.streamProvider
+import io.ktor.locations.KtorExperimentalLocationsAPI
 import io.ktor.locations.Location
 import io.ktor.locations.get
 import io.ktor.request.receiveMultipart
 import io.ktor.response.respond
+import io.ktor.response.respondRedirect
 import io.ktor.response.respondText
 import io.ktor.routing.Routing
 import io.ktor.routing.get
 import io.ktor.routing.post
+import moe.kageru.kodeshare.pages.Css
+import moe.kageru.kodeshare.pages.Homepage
 import moe.kageru.kodeshare.persistence.PasteDao
 
+@KtorExperimentalLocationsAPI
 @ExperimentalStdlibApi
 object Routes {
     fun Routing.createRoutes() {
         get("/") {
-            call.respondText("Hello, world!", ContentType.Text.Html)
+            call.respond(Homepage.content)
+        }
+        get("/style.css") {
+            call.respondText(Css.default, ContentType.Text.CSS)
         }
         post("/") {
-            save(call)
+            call.handlePost()
         }
         get<PasteRequest> { req ->
-            respondGet(call, req)
+            call.handleGet(req)
         }
     }
-}
 
-@ExperimentalStdlibApi
-suspend fun save(call: ApplicationCall) {
-    call.receiveMultipart().forEachPart { part ->
-        when(part) {
-            is PartData.FileItem -> {
-                Log.info("new file")
-                val content = part.streamProvider().use { it.readAllBytes().decodeToString() }
-                val id = PasteDao.insert(Paste(content = content, html = null)).id
-                call.respond(HttpStatusCode.Created, "$id")
-                Log.info("Saving new paste with ID $id")
-            }
-            is PartData.FormItem -> {
-                Log.info("form item")
-            }
-            is PartData.BinaryItem -> {
-                Log.info("binary item")
+    @ExperimentalStdlibApi
+    private suspend fun ApplicationCall.handlePost() {
+        receiveMultipart().forEachPart { part ->
+            when (part) {
+                is PartData.FileItem -> {
+                    val content = part.streamProvider().use { it.readBytes().decodeToString() }
+                    respondToUpload(content)?.let { id ->
+                        Log.info("Saving new file paste with ID $id")
+                    } ?: Log.info("Invalid upload: $content")
+                }
+                is PartData.FormItem -> {
+                    val content = part.value
+                    respondToUpload(content)?.let { id ->
+                        Log.info("Saving new text paste with ID $id")
+                    } ?: Log.info("Invalid upload: $content")
+                }
+                is PartData.BinaryItem -> {
+                    Log.warn("Received binary item from upload form. This shouldn’t happen.")
+                }
             }
         }
     }
-}
 
-suspend fun respondGet(call: ApplicationCall, req: PasteRequest) {
-    val id = req.id
-    Log.info("Retrieving paste $id")
-    PasteDao.select(id)?.data?.let { paste ->
-        call.respondText(paste.html ?: paste.content, ContentType.Text.Html)
-    } ?: call.respond(HttpStatusCode.NotFound, "nothing found for id $id")
+    private suspend fun ApplicationCall.respondToUpload(content: String): Long? {
+        content.ifBlank {
+            respondText("Empty pastes are not allowed", ContentType.Text.Any, HttpStatusCode.BadRequest)
+            return null
+        }
+        val id = PasteDao.insert(Paste(content, null)).id
+        // This will show the URL in a terminal when uploading via curl,
+        // while also redirecting browser uploads to the newly created paste.
+        // May seem odd to return code 302, but it seems to be the only way.
+        response.headers.append(HttpHeaders.Location, "$id")
+        respond(HttpStatusCode.Found, "$id")
+        return id
+    }
+
+    private suspend fun ApplicationCall.handleGet(req: PasteRequest) {
+        val id = req.id
+        Log.info("Retrieving paste $id")
+        PasteDao.select(id)?.data?.let { paste ->
+            respondText(paste.html ?: paste.content, ContentType.Text.Plain)
+        } ?: respond(HttpStatusCode.NotFound, "nothing found for id $id")
+    }
 }
 
+@KtorExperimentalLocationsAPI
 @Location("/{id}")
-data class PasteRequest(val id: Long)
+data class PasteRequest(val id: Long)

src/main/kotlin/moe/kageru/kodeshare/pages/Css.kt

@@ -0,0 +1,56 @@
+package moe.kageru.kodeshare.pages
+
+import kotlinx.css.*
+import kotlinx.css.properties.ms
+import kotlinx.css.properties.transition
+
+object Css {
+    private val accent1 = Color("#cd7400")
+    private val accent2 = Color("#ed7a00")
+    private val fontcolor = Color.lightGrey
+    val default = CSSBuilder().apply {
+        body {
+            fontFamily = "Hack, Fira Code, Noto Mono, monospace"
+            fontSize = 13.pt
+            textAlign = TextAlign.center
+            margin = "auto"
+            backgroundColor = Color.black
+            color = fontcolor
+        }
+        textarea {
+            fontFamily = "Hack, Fira Code, Noto Mono, monospace"
+            backgroundColor = Color.black
+            color = Color.white
+            fontSize = 13.pt
+            borderColor = accent1
+            borderWidth = 3.px
+            borderRadius = 8.px
+            borderStyle = BorderStyle.solid
+            padding = "5px"
+            minWidth = 70.pct
+            maxWidth = 100.pct
+        }
+        rule("input[type=\"submit\"]") {
+            backgroundColor = accent1
+            borderColor = accent1
+            borderWidth = 2.px
+            borderRadius = 5.px
+            borderStyle = BorderStyle.solid
+            color = Color.black
+            fontWeight = FontWeight.w600
+            padding = "5px 15px"
+            cursor = Cursor.pointer
+            transition(duration = 500.ms)
+        }
+        rule("input[type=\"submit\"]:hover") {
+            backgroundColor = Color.transparent
+            color = accent1
+        }
+        rule("textarea:focus") {
+            borderColor = accent2
+        }
+        rule("::selection") {
+            color = accent1
+        }
+    }.toString()
+}

src/main/kotlin/moe/kageru/kodeshare/pages/Homepage.kt

@@ -0,0 +1,30 @@
+package moe.kageru.kodeshare.pages
+
+import io.ktor.html.HtmlContent
+import io.ktor.http.HttpStatusCode
+import kotlinx.html.*
+
+object Homepage {
+    val content = HtmlContent(HttpStatusCode.OK) {
+        head {
+            link(rel = "stylesheet", href = "/style.css", type = "text/css")
+        }
+        body {
+            h1 { +"kodeshare - yet another paste service" }
+            form("/", encType = FormEncType.multipartFormData, method = FormMethod.post) {
+                acceptCharset = "utf-8"
+                p {
+                    label { +"Enter or paste your text here " }
+                }
+                textArea {
+                    name = "input"
+                    rows = "20"
+                    cols = "100"
+                }
+                p {
+                    submitInput { value = "Upload" }
+                }
+            }
+        }
+    }
+}

src/main/kotlin/moe/kageru/kodeshare/persistence/PasteDao.kt

@@ -20,7 +20,7 @@ object PasteDao {
 
     init {
         val source = MariaDbDataSource().apply {
-            userName = "kodepaste"
+            userName = "kodeshare"
             setPassword("12345")
             databaseName = "kode"
         }