Add Swagger UI lib

swagger-ui/build.gradle.kts

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+plugins {
+    alias(libs.plugins.kotlin.jvm)
+}
+
+dependencies {
+    implementation(project(":core"))
+    compileOnly(libs.jakarta.api)
+
+    testImplementation(libs.kotlin.test)
+    testImplementation(libs.mockk)
+    testImplementation(libs.jakarta.api)
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+kotlin {
+    jvmToolchain(21)
+}

swagger-ui/src/main/kotlin/swagger/ui/SwaggerUI.kt

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+package swagger.ui
+
+import kotlet.Handler
+import kotlet.HttpCall
+import kotlet.Routing
+
+/**
+ * Install OpenAPI endpoint to the routing
+ *
+ * @param configure Configuration of the OpenAPI endpoint
+ */
+fun Routing.installSwaggerUIEndpoint(configure: SwaggerUIConfigBuilder.() -> Unit) {
+    val builder = SwaggerUIConfigBuilder()
+    builder.configure()
+    val config = builder.build()
+
+    fun serveResource(path: String, contentType: String) {
+        get("${config.path}/$path", SwaggerUIResourceHandler("/ui/$path", contentType))
+    }
+
+    // Serve swagger ui static files
+    get(config.path, RedirectHandler("${config.path}/index.html"))
+    serveResource("index.html", MediaTypes.TEXT_HTML)
+    serveResource("index.css", MediaTypes.TEXT_CSS)
+    serveResource("swagger-ui.css", MediaTypes.TEXT_CSS)
+    serveResource("swagger-ui-standalone-preset.js", MediaTypes.JAVASCRIPT)
+    serveResource("swagger-ui-bundle.js", MediaTypes.JAVASCRIPT)
+    get("${config.path}/swagger-initializer.js", SwaggerUIInitializerHandler(openAPIPath = config.openAPIPath))
+}
+
+private class RedirectHandler(private val location: String) : Handler {
+    override fun invoke(call: HttpCall) {
+        call.rawResponse.sendRedirect(location)
+    }
+}
+
+private class SwaggerUIResourceHandler(
+    resourcePath: String,
+    private val contentType: String,
+) : Handler {
+    private val bytes: ByteArray = loadSwaggerUIResource(resourcePath)
+
+    override fun invoke(call: HttpCall) {
+        call.rawResponse.contentType = contentType
+        call.respondBytes(bytes)
+    }
+}
+
+private fun loadSwaggerUIResource(path: String): ByteArray {
+    val resourceStream = requireNotNull(SwaggerUIResourceHandler::class.java.getResourceAsStream(path)) {
+        "Resource not found: $path"
+    }
+    return resourceStream.readBytes()
+}
+
+private class SwaggerUIInitializerHandler(openAPIPath: String) : Handler {
+    private val bytes = """
+        window.onload = function() {
+          window.ui = SwaggerUIBundle({
+            url: "$openAPIPath",
+            dom_id: '#swagger-ui',
+            deepLinking: true,
+            presets: [
+              SwaggerUIBundle.presets.apis,
+              SwaggerUIStandalonePreset
+            ],
+            plugins: [
+              SwaggerUIBundle.plugins.DownloadUrl
+            ],
+            layout: "StandaloneLayout"
+          });
+        };
+    """.trimIndent().toByteArray()
+
+    override fun invoke(call: HttpCall) {
+        call.rawResponse.contentType = MediaTypes.JAVASCRIPT
+        call.respondBytes(bytes)
+    }
+}
+
+/**
+ * Media types for Swagger UI resources
+ */
+private object MediaTypes {
+    const val TEXT_HTML = "text/html"
+    const val TEXT_CSS = "text/css"
+    const val JAVASCRIPT = "application/javascript"
+}

swagger-ui/src/main/kotlin/swagger/ui/SwaggerUIConfig.kt

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+package swagger.ui
+
+/**
+ * Configuration for the Swagger UI endpoint
+ */
+internal data class SwaggerUIConfig(
+    val path: String,
+    val openAPIPath: String,
+)
+
+/**
+ * Builder for [SwaggerUIConfig].
+ */
+class SwaggerUIConfigBuilder internal constructor() {
+    /**
+     * Path to the Swagger UI endpoint
+     */
+    var path: String = "/swagger/ui"
+
+    /**
+     * Path to the OpenAPI endpoint
+     */
+    var openAPIPath: String = "/openapi.json"
+
+    internal fun build(): SwaggerUIConfig {
+        return SwaggerUIConfig(
+            path = path,
+            openAPIPath = openAPIPath,
+        )
+    }
+}

swagger-ui/src/main/resources/ui/index.css

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+html {
+    box-sizing: border-box;
+    overflow: -moz-scrollbars-vertical;
+    overflow-y: scroll;
+}
+
+*,
+*:before,
+*:after {
+    box-sizing: inherit;
+}
+
+body {
+    margin: 0;
+    background: #fafafa;
+}

swagger-ui/src/main/resources/ui/index.html

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+<!-- HTML for static distribution bundle build -->
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8">
+    <title>Swagger UI</title>
+    <link rel="stylesheet" type="text/css" href="./swagger-ui.css" />
+    <link rel="stylesheet" type="text/css" href="./index.css" />
+    <link rel="icon" type="image/png" href="./favicon-32x32.png" sizes="32x32" />
+    <link rel="icon" type="image/png" href="./favicon-16x16.png" sizes="16x16" />
+  </head>
+
+  <body>
+    <div id="swagger-ui"></div>
+    <script src="./swagger-ui-bundle.js" charset="UTF-8"> </script>
+    <script src="./swagger-ui-standalone-preset.js" charset="UTF-8"> </script>
+    <script src="./swagger-initializer.js" charset="UTF-8"> </script>
+  </body>
+</html>

swagger-ui/src/main/resources/ui/oauth2-redirect.html

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+<!doctype html>
+<html lang="en-US">
+<head>
+    <title>Swagger UI: OAuth2 Redirect</title>
+</head>
+<body>
+<script>
+    'use strict';
+    function run () {
+        var oauth2 = window.opener.swaggerUIRedirectOauth2;
+        var sentState = oauth2.state;
+        var redirectUrl = oauth2.redirectUrl;
+        var isValid, qp, arr;
+
+        if (/code|token|error/.test(window.location.hash)) {
+            qp = window.location.hash.substring(1).replace('?', '&');
+        } else {
+            qp = location.search.substring(1);
+        }
+
+        arr = qp.split("&");
+        arr.forEach(function (v,i,_arr) { _arr[i] = '"' + v.replace('=', '":"') + '"';});
+        qp = qp ? JSON.parse('{' + arr.join() + '}',
+                function (key, value) {
+                    return key === "" ? value : decodeURIComponent(value);
+                }
+        ) : {};
+
+        isValid = qp.state === sentState;
+
+        if ((
+          oauth2.auth.schema.get("flow") === "accessCode" ||
+          oauth2.auth.schema.get("flow") === "authorizationCode" ||
+          oauth2.auth.schema.get("flow") === "authorization_code"
+        ) && !oauth2.auth.code) {
+            if (!isValid) {
+                oauth2.errCb({
+                    authId: oauth2.auth.name,
+                    source: "auth",
+                    level: "warning",
+                    message: "Authorization may be unsafe, passed state was changed in server. The passed state wasn't returned from auth server."
+                });
+            }
+
+            if (qp.code) {
+                delete oauth2.state;
+                oauth2.auth.code = qp.code;
+                oauth2.callback({auth: oauth2.auth, redirectUrl: redirectUrl});
+            } else {
+                let oauthErrorMsg;
+                if (qp.error) {
+                    oauthErrorMsg = "["+qp.error+"]: " +
+                        (qp.error_description ? qp.error_description+ ". " : "no accessCode received from the server. ") +
+                        (qp.error_uri ? "More info: "+qp.error_uri : "");
+                }
+
+                oauth2.errCb({
+                    authId: oauth2.auth.name,
+                    source: "auth",
+                    level: "error",
+                    message: oauthErrorMsg || "[Authorization failed]: no accessCode received from the server."
+                });
+            }
+        } else {
+            oauth2.callback({auth: oauth2.auth, token: qp, isValid: isValid, redirectUrl: redirectUrl});
+        }
+        window.close();
+    }
+
+    if (document.readyState !== 'loading') {
+        run();
+    } else {
+        document.addEventListener('DOMContentLoaded', function () {
+            run();
+        });
+    }
+</script>
+</body>
+</html>

swagger-ui/src/main/resources/ui/swagger-initializer.js

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+window.onload = function() {
+  //<editor-fold desc="Changeable Configuration Block">
+
+  // the following lines will be replaced by docker/configurator, when it runs in a docker-container
+  window.ui = SwaggerUIBundle({
+    url: "https://petstore.swagger.io/v2/swagger.json",
+    dom_id: '#swagger-ui',
+    deepLinking: true,
+    presets: [
+      SwaggerUIBundle.presets.apis,
+      SwaggerUIStandalonePreset
+    ],
+    plugins: [
+      SwaggerUIBundle.plugins.DownloadUrl
+    ],
+    layout: "StandaloneLayout"
+  });
+
+  //</editor-fold>
+};