feat(amazonq): Create a common langauge server downloader (#6148)

## Problem
- we need a way to download the manifest and install the correct mynah
ui/language server code

## Solution
- create a common lsp downloader that flare/workspace lsps can use

packages/amazonq/src/lsp/activation.ts

@@ -4,9 +4,18 @@
  */
 
 import vscode from 'vscode'
+import { AmazonQLSPDownloader } from './download'
 
 export async function activate(ctx: vscode.ExtensionContext): Promise<void> {
+    const serverPath = ctx.asAbsolutePath('resources/qdeveloperserver')
+    const clientPath = ctx.asAbsolutePath('resources/qdeveloperclient')
+    await new AmazonQLSPDownloader(serverPath, clientPath).tryInstallLsp()
+
     /**
-     * download install and run the language server
+     * at this point the language server should be installed and available
+     * at serverPath and mynah ui should be available and serveable at
+     * clientPath
+     *
+     * TODO: actually hook up the language server
      */
 }

packages/amazonq/src/lsp/download.ts

@@ -0,0 +1,77 @@
+/*!
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import {
+    LspDownloader,
+    getLogger,
+    makeTemporaryToolkitFolder,
+    tryRemoveFolder,
+    fs,
+    Manifest,
+} from 'aws-core-vscode/shared'
+
+const manifestURL = 'https://aws-toolkit-language-servers.amazonaws.com/codewhisperer/0/manifest.json'
+
+export class AmazonQLSPDownloader extends LspDownloader {
+    constructor(
+        private readonly serverPath: string,
+        private readonly clientPath: string
+    ) {
+        super(manifestURL)
+    }
+
+    async isLspInstalled(): Promise<boolean> {
+        return (await fs.exists(this.serverPath)) && (await fs.exists(this.clientPath))
+    }
+
+    async cleanup(): Promise<boolean> {
+        if (await fs.exists(this.serverPath)) {
+            await tryRemoveFolder(this.serverPath)
+        }
+
+        if (await fs.exists(this.clientPath)) {
+            await tryRemoveFolder(this.clientPath)
+        }
+
+        return true
+    }
+
+    async install(manifest: Manifest) {
+        const server = this.getDependency(manifest, 'servers')
+        const clients = this.getDependency(manifest, 'clients')
+        if (!server || !clients) {
+            getLogger('lsp').info(`Did not find LSP URL for ${process.platform} ${process.arch}`)
+            return false
+        }
+
+        let tempFolder = undefined
+
+        try {
+            tempFolder = await makeTemporaryToolkitFolder()
+
+            // download and extract the business logic
+            await this.downloadAndExtractServer({
+                content: server,
+                installLocation: this.serverPath,
+                name: 'qdeveloperserver',
+                tempFolder,
+            })
+
+            // download and extract mynah ui
+            await this.downloadAndExtractServer({
+                content: clients,
+                installLocation: this.clientPath,
+                name: 'qdeveloperclient',
+                tempFolder,
+            })
+        } finally {
+            if (tempFolder) {
+                await tryRemoveFolder(tempFolder)
+            }
+        }
+
+        return true
+    }
+}

packages/amazonq/test/unit/amazonq/lsp/lspController.test.ts

@@ -4,9 +4,9 @@
  */
 import assert from 'assert'
 import sinon from 'sinon'
-import { Content, LspController } from 'aws-core-vscode/amazonq'
+import { LspController } from 'aws-core-vscode/amazonq'
 import { createTestFile } from 'aws-core-vscode/test'
-import { fs } from 'aws-core-vscode/shared'
+import { fs, Content } from 'aws-core-vscode/shared'
 
 describe('Amazon Q LSP controller', function () {
     it('Download mechanism checks against hash, when hash matches', async function () {

packages/core/src/amazonq/index.ts

@@ -15,7 +15,7 @@ export {
     walkthroughInlineSuggestionsExample,
     walkthroughSecurityScanExample,
 } from './onboardingPage/walkthrough'
-export { LspController, Content } from './lsp/lspController'
+export { LspController } from './lsp/lspController'
 export { LspClient } from './lsp/lspClient'
 export { api } from './extApi'
 export { AmazonQChatViewProvider } from './webview/webView'