Plugin source URLs (#10000)

* Better handling of URLs when loading plugin source

- Handle complex URLs more cleanly
- Support loading from actual external host
- Support loading with specified port

* Fix URL rendering - handle "local" and "remote" components

* Use default host if not provided

* Simplify code

src/frontend/src/components/plugins/PluginSource.tsx

@@ -1,4 +1,5 @@
 import { generateUrl } from '../../functions/urls';
+import { useLocalState } from '../../states/LocalState';
 
 /*
  * Load an external plugin source from a URL.
@@ -32,13 +33,22 @@ export async function findExternalPluginFunction(
   source: string,
   functionName: string
 ): Promise<Function | null> {
-  // The source URL may also include the function name divided by a colon
-  // otherwise the provided function name will be used
-  if (source.includes(':')) {
-    [source, functionName] = source.split(':');
+  const { getHost } = useLocalState.getState();
+
+  // Extract pathstring from the source URL
+  // Use the specified host unless the source is already a full URL
+  const url = new URL(source, getHost());
+
+  // If the pathname contains a ':' character, it indicates a function name
+  // but we need to remove it for the URL lookup to work correctly
+  if (url.pathname.includes(':')) {
+    const parts = url.pathname.split(':');
+    source = parts[0]; // Use the first part as the source URL
+    functionName = parts[1] || functionName; // Use the second part as the
+    url.pathname = source; // Update the pathname to the source URL
   }
 
-  const module = await loadExternalPluginSource(source);
+  const module = await loadExternalPluginSource(url.toString());
 
   if (module?.[functionName]) {
     return module[functionName];

src/frontend/src/components/plugins/RemoteComponent.tsx

@@ -9,6 +9,7 @@ import { type Root, createRoot } from 'react-dom/client';
 import { api, queryClient } from '../../App';
 import { ApiProvider } from '../../contexts/ApiContext';
 import { LanguageContext } from '../../contexts/LanguageContext';
+import { useLocalState } from '../../states/LocalState';
 import { Boundary } from '../Boundary';
 import { findExternalPluginFunction } from './PluginSource';
 
@@ -43,19 +44,17 @@ export default function RemoteComponent({
     undefined
   );
 
-  const sourceFile = useMemo(() => {
-    return source.split(':')[0];
-  }, [source]);
+  const func: string = useMemo(() => {
+    // Attempt to extract the function name from the source
+    const { getHost } = useLocalState.getState();
+    const url = new URL(source, getHost());
 
-  // Determine the function to call in the external plugin source
-  const functionName = useMemo(() => {
-    // The "source" string may contain a function name, e.g. "source.js:myFunction"
-    if (source.includes(':')) {
-      return source.split(':')[1];
+    if (url.pathname.includes(':')) {
+      const parts = url.pathname.split(':');
+      return parts[1] || defaultFunctionName; // Use the second part as the function name, or fallback to default
+    } else {
+      return defaultFunctionName;
     }
-
-    // By default, return the default function name
-    return defaultFunctionName;
   }, [source, defaultFunctionName]);
 
   const reloadPluginContent = useCallback(() => {
@@ -68,8 +67,8 @@ export default function RemoteComponent({
       reloadContent: reloadPluginContent
     };
 
-    if (sourceFile && functionName) {
-      findExternalPluginFunction(sourceFile, functionName)
+    if (source && defaultFunctionName) {
+      findExternalPluginFunction(source, func)
         .then((func) => {
           if (!!func) {
             try {
@@ -99,30 +98,28 @@ export default function RemoteComponent({
               console.error(error);
             }
           } else {
-            setRenderingError(`${sourceFile}:${functionName}`);
+            setRenderingError(`${source} / ${func}`);
           }
         })
         .catch((_error) => {
           console.error(
-            `ERR: Failed to load remove plugin function: ${sourceFile}:${functionName}`
+            `ERR: Failed to load remote plugin function: ${source} /${func}`
           );
         });
     } else {
       setRenderingError(
-        `${t`Invalid source or function name`} - ${sourceFile}:${functionName}`
+        `${t`Invalid source or function name`} - ${source} /${func}`
       );
     }
-  }, [componentRef, rootElement, sourceFile, functionName, context]);
+  }, [componentRef, rootElement, source, defaultFunctionName, context]);
 
   // Reload the plugin content dynamically
   useEffect(() => {
     reloadPluginContent();
-  }, [sourceFile, functionName, context, rootElement]);
+  }, [source, func, context, rootElement]);
 
   return (
-    <Boundary
-      label={identifierString(`RemoteComponent-${sourceFile}-${functionName}`)}
-    >
+    <Boundary label={identifierString(`RemoteComponent-${func}`)}>
       <Stack gap='xs'>
         {renderingError && (
           <Alert