Add support for external plugins

ui/open-api-ui/src/main/java/io/smallrye/openapi/ui/IndexHtmlCreator.java

@@ -41,6 +41,8 @@ public static byte[] createIndexHtml(Map<String, String> urls, String urlsPrimar
         addOAuthSection(options);
         // Add Preauth section
         addPreauthorizeSection(options);
+        // Add any custom scripts
+        addScripts(options);
 
         try (InputStream input = IndexHtmlCreator.class.getClassLoader()
                 .getResourceAsStream("META-INF/resources/template/index.html");
@@ -232,6 +234,22 @@ private static void addOAuthSection(Map<Option, String> options) {
         }
     }
 
+    private static void addScripts(Map<Option, String> options) {
+        if (options.containsKey(Option.scripts)) {
+            String[] scripts = options.get(Option.scripts).split(COMMA);
+            try (StringWriter sw = new StringWriter()) {
+                for (String script : scripts) {
+                    sw.write("<script src=\"" + script.trim() + "\"></script>\n");
+                }
+                String scriptsSection = sw.toString();
+
+                options.put(Option.scriptsSection, scriptsSection);
+            } catch (IOException ex) {
+                throw new RuntimeException(ex);
+            }
+        }
+    }
+
     private static void addUrlSection(Map<String, String> urls, String urlsPrimaryName, Map<Option, String> options) {
         // If you added a urlSection, we assume you know what you are doing
         if (!options.containsKey(Option.urlSection)) {
@@ -284,12 +302,12 @@ private static void addUrlSection(Map<String, String> urls, String urlsPrimaryNa
     private static final String VAR_END = "}";
 
     private static final Map<Option, String> DEFAULT_OPTIONS = new HashMap<>();
-    private static final String DEFAULT_URLS_PRIMARY_NAME = "Default";
+    private static final String COMMA = ",";
     private static final String URL_FORMAT = "url: '%s'";
     private static final String URLS_ENTRY_FORMAT = "{url: \"%s\", name: \"%s\"}";
 
     static {
-
+        DEFAULT_OPTIONS.put(Option.scriptsSection, null);
         DEFAULT_OPTIONS.put(Option.url, "/openapi");
         DEFAULT_OPTIONS.put(Option.title, "SmallRye OpenAPI UI");
         DEFAULT_OPTIONS.put(Option.selfHref, "/openapi-ui");

ui/open-api-ui/src/main/java/io/smallrye/openapi/ui/Option.java

@@ -6,6 +6,8 @@
  * @author Phillip Kruger ([email protected])
  */
 public enum Option {
+    scriptsSection,
+    scripts,
     url,
     urlSection,
     title,

ui/open-api-ui/src/main/resources/template/index.html

@@ -16,6 +16,7 @@
         <footer id="footer">${footer}</footer>
         <script src="swagger-ui-bundle.js" charset="UTF-8"></script>
         <script src="swagger-ui-standalone-preset.js" charset="UTF-8"> </script>
+        ${scriptsSection}
         <script>
 
             window.onload = function() {

ui/open-api-ui/src/test/java/io/smallrye/openapi/ui/IndexCreatorTest.java

@@ -152,6 +152,22 @@ void testCreateWithInitOAuth() throws IOException {
         assertTrue(s.contains("usePkceWithAuthorizationCodeGrant: true"));
     }
 
+    @Test
+    void testCreateWithCustomeScript() throws IOException {
+        Map<Option, String> options = new HashMap<>();
+        options.put(Option.scripts, "https://unpkg.com/swagger-ui-plugin-hierarchical-tags");
+        options.put(Option.plugins, "[SwaggerUIBundle.plugins.DownloadUrl,HierarchicalTagsPlugin]");
+
+        byte[] indexHtml = IndexHtmlCreator.createIndexHtml(options);
+        assertNotNull(indexHtml);
+
+        String s = new String(indexHtml);
+
+        assertTrue(s.contains("<title>SmallRye OpenAPI UI</title>"));
+        assertTrue(s.contains("<script src=\"https://unpkg.com/swagger-ui-plugin-hierarchical-tags\"></script>"));
+        assertTrue(s.contains("plugins: [SwaggerUIBundle.plugins.DownloadUrl,HierarchicalTagsPlugin]"));
+    }
+
     @Test
     void testCreateWithPreauthorizeBasic() throws IOException {
         Map<Option, String> options = new HashMap<>();