Support relative $refs, remote content loading from URL and open local folders

README.md

@@ -57,6 +57,58 @@ pnpm run build:ds
 pnpm run build
 ```
 
+## Features
+
+### Remote URL Import with Relative References
+
+Studio supports importing AsyncAPI files from remote URLs with automatic resolution of relative `$ref` references:
+
+- Import files from any URL (e.g., GitHub raw URLs, public APIs)
+- The parser automatically resolves relative references using the remote URL as base path
+- Example: A file at `https://example.com/specs/api.yaml` referencing `../schemas/user.json` resolves to `https://example.com/schemas/user.json`
+
+### Local Folder Access for Reference Resolution
+
+Studio can resolve local file references (e.g., `$ref: './schema.avsc'`) by requesting folder access:
+
+**Workflow:**
+1. Click **Import** → **Open Folder**
+2. Select the root folder containing your AsyncAPI files and schemas
+3. Select the main AsyncAPI file within that folder
+4. The parser automatically resolves all relative file references
+
+**Supported reference formats:**
+- `./schema.avsc` - Same directory as the AsyncAPI file
+- `../common/types.yaml` - Parent directory
+- `apis/avro/schema.avsc` - Subdirectory path
+
+**Supported schema formats:**
+- Avro `.avsc` files
+- JSON Schema `.json` files
+- YAML schema `.yaml` files
+
+**Browser compatibility:**
+- ✅ Chrome, Edge, Brave (File System Access API supported)
+- ❌ Firefox, Safari (not supported)
+
+**Security note:** Folder access is granted per session only and is not persisted. You must grant access each time you open the application.
+
+### Schema Editing
+
+- Edit both the main AsyncAPI document and referenced schema files
+- Changes to referenced schemas are automatically reflected when the parser re-validates
+- Real-time validation across all files
+
+### File Saving
+
+- Files opened from a folder (using **Open Folder**) can be saved to their original location with the **Save** button
+- For other files, the **Save** button behaves as **Save As**, allowing you to export the current editor content to a selected local file
+
+### Additional Viewers
+
+- **Markdown Preview**: View documentation files with full Markdown rendering, including Mermaid diagrams
+- **Avro Schema Viewer**: Visualize Avro schemas with automatically generated Mermaid diagrams
+
 ## Architecture decision records
 
 ### Create a new architecture decision record

apps/studio/package.json

@@ -86,6 +86,7 @@
     "js-yaml": "^4.1.1",
     "monaco-editor": "0.34.1",
     "monaco-yaml": "4.0.2",
+    "mermaid": "^11.13.0",
     "next": "14.2.35",
     "postcss": "8.4.31",
     "react": "18.2.0",
@@ -120,6 +121,7 @@
     "@types/node": "^18.11.9",
     "@types/react": "^18.0.25",
     "@types/react-dom": "^18.0.9",
+    "@types/wicg-file-system-access": "^2023.10.7",
     "assert": "^2.0.0",
     "autoprefixer": "^10.4.13",
     "browserify-zlib": "^0.2.0",

apps/studio/src/components/Content.tsx

@@ -19,7 +19,7 @@ export const Content: FunctionComponent<ContentProps> = () => { // eslint-disabl
   const navigationEnabled = show.primarySidebar;
   const editorEnabled = show.primaryPanel;
   const viewEnabled = show.secondaryPanel;
-  const viewType = secondaryPanelType;
+  const viewType = secondaryPanelType === 'avro' ? 'template' : secondaryPanelType;
 
   const splitPosLeft = 'splitPos:left';
   const splitPosRight = 'splitPos:right';

apps/studio/src/components/Editor/ConvertDropdown.tsx

@@ -11,17 +11,17 @@ import { useDocumentsState, useFilesState } from '../../state';
 export const ConvertDropdown: React.FC = () => {
   const { editorSvc } = useServices();
   const isInvalidDocument = !useDocumentsState(state => 
-    state.documents['asyncapi'].valid
+    state.documents['asyncapi']?.valid
   );
   const language = useFilesState(state => state.files['asyncapi'].language);
 
   return (
     <Dropdown
       opener={
         <Tooltip content="Convert" placement="top" hideOnClick={true}>
-          <button className="bg-inherit">
+          <div className="bg-inherit">
             <FaFileExport />
-          </button>
+          </div>
         </Tooltip>
       }
       buttonHoverClassName="text-gray-500 hover:text-white"

apps/studio/src/components/Editor/EditorDropdown.tsx

@@ -9,6 +9,7 @@ import {
   GeneratorModal,
   ConvertModal,
   ImportUUIDModal,
+  OpenFolderModal,
 } from '../Modals';
 import { Dropdown } from '../common';
 
@@ -20,9 +21,10 @@ interface EditorDropdownProps {}
 export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () => {
   const { editorSvc } = useServices();
   const isInvalidDocument = !useDocumentsState(state => {
-    return state.documents['asyncapi'].valid
+    return state.documents['asyncapi']?.valid
   });
-  const language = useFilesState(state => state.files['asyncapi'].language);
+  const file = useFilesState(state => state.files['asyncapi']);
+  const language = file.language;
 
   const importUrlButton = (
     <button
@@ -46,14 +48,17 @@ export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () =
     </button>
   );
 
+  const fileInputRef = React.useRef<HTMLInputElement>(null);
+
   const importFileButton = (
     <label
       className="block px-4 py-1 w-full text-left text-sm rounded-md focus:outline-none transition ease-in-out duration-150 cursor-pointer"
       title="Import File"
     >
       <input
+        ref={fileInputRef}
         type="file"
-        accept='.yaml, .yml, .json'
+        accept='.yaml, .yml, .json, .avsc'
         style={{ position: 'fixed', top: '-100em' }}
         onChange={event => {
           toast.promise(editorSvc.importFile(event.target.files), {
@@ -73,12 +78,25 @@ export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () =
               </div>
             ),
           });
+          // Reset so the same file can be re-imported
+          if (fileInputRef.current) fileInputRef.current.value = '';
         }}
       />
       Import File
     </label>
   );
 
+  const openFolderButton = (
+    <button
+      type="button"
+      className="px-4 py-1 w-full text-left text-sm rounded-md focus:outline-none transition ease-in-out duration-150"
+      title="Open Folder"
+      onClick={() => show(OpenFolderModal)}
+    >
+      Open Folder
+    </button>
+  );
+
   const importBase64Button = (
     <button
       type="button"
@@ -106,12 +124,10 @@ export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () =
     <button
       type="button"
       className="px-4 py-1 w-full text-left text-sm rounded-md focus:outline-none transition ease-in-out duration-150 disabled:cursor-not-allowed"
-      title={`Save as ${language === 'yaml' ? 'YAML' : 'JSON'}`}
+      title="Save"
       onClick={() => {
         toast.promise(
-          language === 'yaml'
-            ? editorSvc.saveAsYaml()
-            : editorSvc.saveAsJSON(),
+          editorSvc.saveCurrentFile(),
           {
             loading: 'Saving...',
             success: (
@@ -131,46 +147,9 @@ export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () =
           },
         );
       }}
-      disabled={isInvalidDocument}
+      disabled={!file.modified}
     >
-      Save as {language === 'yaml' ? 'YAML' : 'JSON'}
-    </button>
-  );
-
-  const convertLangAndSaveButton = (
-    <button
-      type="button"
-      className="px-4 py-1 w-full text-left text-sm rounded-md focus:outline-none transition ease-in-out duration-150 disabled:cursor-not-allowed"
-      title={`Convert and save as ${
-        language === 'yaml' ? 'JSON' : 'YAML'
-      }`}
-      onClick={() => {
-        toast.promise(
-          language === 'yaml'
-            ? editorSvc.saveAsJSON()
-            : editorSvc.saveAsYaml(),
-          {
-            loading: 'Saving...',
-            success: (
-              <div>
-                <span className="block text-bold">
-                  Document succesfully converted and saved!
-                </span>
-              </div>
-            ),
-            error: (
-              <div>
-                <span className="block text-bold text-red-400">
-                  Failed to convert and save document.
-                </span>
-              </div>
-            ),
-          },
-        );
-      }}
-      disabled={isInvalidDocument}
-    >
-      Convert and save as {language === 'yaml' ? 'JSON' : 'YAML'}
+      Save
     </button>
   );
 
@@ -255,6 +234,9 @@ export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () =
           <li className="hover:bg-gray-900">
             {importUrlButton}
           </li>
+          <li className="hover:bg-gray-900">
+            {openFolderButton}
+          </li>
           <li className="hover:bg-gray-900">
             {importFileButton}
           </li>
@@ -279,9 +261,6 @@ export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () =
           <li className="hover:bg-gray-900">
             {saveFileButton}
           </li>
-          <li className="hover:bg-gray-900">
-            {convertLangAndSaveButton}
-          </li>
         </div>
         <div>
           <li className="hover:bg-gray-900">
@@ -295,3 +274,4 @@ export const EditorDropdown: React.FunctionComponent<EditorDropdownProps> = () =
     </Dropdown>
   );
 };
+

apps/studio/src/components/Editor/EditorSidebar.tsx

@@ -4,25 +4,30 @@ import { useFilesState } from '../../state';
 import { ShareButton } from './ShareButton';
 import { ImportDropdown } from './ImportDropdown';
 import { GenerateDropdown } from './GenerateDropdown';
-import { SaveDropdown } from './SaveDropdown';
+import { SaveButton } from './SaveDropdown';
 import { ConvertDropdown } from './ConvertDropdown';
 
 interface EditorSidebarProps {}
 
 export const EditorSidebar: React.FunctionComponent<
   EditorSidebarProps
 > = () => {
-  const { source, from } = useFilesState((state) => state.files['asyncapi']);
+  const { source, from, localPath, uri } = useFilesState((state) => state.files['asyncapi']);
 
   let documentFromText = '';
   if (from === 'storage') {
     documentFromText = 'From localStorage';
+  } else if (from === 'file') {
+    const path = source || localPath || uri;
+    documentFromText = path ? `From local folder: ${path}` : 'From local folder';
+  } else if (from === 'url') {
+    documentFromText = `From URL ${source || uri || ''}`.trim();
   } else if (from === 'base64') {
     documentFromText = 'From Base64';
   } else if (from === 'share') {
     documentFromText = 'From Shared';
   } else {
-    documentFromText = `From URL ${source}`;
+    documentFromText = source || uri ? `From ${source || uri}` : 'From unknown source';
   }
 
   return (
@@ -49,7 +54,7 @@ export const EditorSidebar: React.FunctionComponent<
               <GenerateDropdown />
             </li>
             <li>
-              <SaveDropdown />
+              <SaveButton />
             </li>
             <li>
               <ConvertDropdown />

apps/studio/src/components/Editor/GenerateDropdown.tsx

@@ -10,17 +10,17 @@ import { useServices } from '@/services';
 
 export const GenerateDropdown: React.FC = () => {
   const isInvalidDocument = !useDocumentsState(state => 
-    state.documents['asyncapi'].valid
+    state.documents['asyncapi']?.valid
   );
   const { editorSvc } = useServices();
 
   return (
     <Dropdown
       opener={
         <Tooltip content="Generate" placement="top" hideOnClick={true}>
-          <button className="bg-inherit">
+          <div className="bg-inherit">
             <FaCode />
-          </button>
+          </div>
         </Tooltip>
       }
       buttonHoverClassName="text-gray-500 hover:text-white"
@@ -65,4 +65,5 @@ export const GenerateDropdown: React.FC = () => {
       </ul>
     </Dropdown>
   );
-};
+};
+