From 38842593a9e27dd00c750edfbc4b99aa7e4c1cd8 Mon Sep 17 00:00:00 2001
From: Josh Pinkney <jpink@amazon.com>
Date: Wed, 8 Jan 2025 22:46:12 -0500
Subject: [PATCH] feat(amazonq): Add lsp downloading support for windows/lunx

---
 packages/core/src/shared/fs/fs.ts           | 28 +++++++++++++++++++++
 packages/core/src/shared/lsp/lspResolver.ts |  3 +--
 packages/core/src/shared/vscode/env.ts      | 12 ---------
 3 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/packages/core/src/shared/fs/fs.ts b/packages/core/src/shared/fs/fs.ts
index 1c7132648bc..077709be2c9 100644
--- a/packages/core/src/shared/fs/fs.ts
+++ b/packages/core/src/shared/fs/fs.ts
@@ -543,6 +543,34 @@ export class FileSystem {
         return this.#homeDir
     }
 
+    /**
+     * Gets the application cache folder for the current platform
+     *
+     * Follows the cache_dir convention outlined in https://crates.io/crates/dirs
+     */
+    getCacheDir(): string {
+        switch (process.platform) {
+            case 'darwin': {
+                return _path.join(this.getUserHomeDir(), 'Library/Caches')
+            }
+            case 'win32': {
+                const localAppData = process.env.LOCALAPPDATA
+                if (!localAppData) {
+                    throw new ToolkitError('LOCALAPPDATA environment variable not set', {
+                        code: 'LocalAppDataNotFound',
+                    })
+                }
+                return localAppData
+            }
+            case 'linux': {
+                return _path.join(this.getUserHomeDir(), '.cache')
+            }
+            default: {
+                throw new Error(`Unsupported platform: ${process.platform}. Expected 'darwin', 'win32', or 'linux'.`)
+            }
+        }
+    }
+
     /**
      * Gets the (cached) username for this session, or "webuser" in web-mode, or "unknown-user" if
      * a username could not be resolved.
diff --git a/packages/core/src/shared/lsp/lspResolver.ts b/packages/core/src/shared/lsp/lspResolver.ts
index d85ee73b929..17b21a994ca 100644
--- a/packages/core/src/shared/lsp/lspResolver.ts
+++ b/packages/core/src/shared/lsp/lspResolver.ts
@@ -10,7 +10,6 @@ import * as path from 'path'
 import { FileType } from 'vscode'
 import AdmZip from 'adm-zip'
 import { TargetContent, logger, LspResult, LspVersion, Manifest } from './types'
-import { getApplicationSupportFolder } from '../vscode/env'
 import { createHash } from '../crypto'
 import { lspSetupStage, StageResolver, tryStageResolvers } from './utils/setupStage'
 import { HttpResourceFetcher } from '../resourcefetcher/httpResourceFetcher'
@@ -394,7 +393,7 @@ export class LanguageServerResolver {
 
     // lazy calls to `getApplicationSupportFolder()` to avoid failure on windows.
     public static get defaultDir() {
-        return path.join(getApplicationSupportFolder(), `aws/toolkits/language-servers`)
+        return path.join(fs.getCacheDir(), `aws/toolkits/language-servers`)
     }
 
     defaultDownloadFolder() {
diff --git a/packages/core/src/shared/vscode/env.ts b/packages/core/src/shared/vscode/env.ts
index 05cd21613e7..004db0efc27 100644
--- a/packages/core/src/shared/vscode/env.ts
+++ b/packages/core/src/shared/vscode/env.ts
@@ -12,7 +12,6 @@ import { onceChanged } from '../utilities/functionUtils'
 import { ChildProcess } from '../utilities/processUtils'
 import globals, { isWeb } from '../extensionGlobals'
 import * as devConfig from '../../dev/config'
-import path from 'path'
 
 /**
  * Returns true if the current build is running on CI (build server).
@@ -271,14 +270,3 @@ export async function getMachineId(): Promise<string> {
     // TODO: check exit code.
     return (await proc.run()).stdout.trim() ?? 'unknown-host'
 }
-
-export function getApplicationSupportFolder() {
-    switch (process.platform) {
-        case 'darwin': {
-            return path.join(os.homedir(), 'Library/Application Support')
-        }
-        default: {
-            throw new Error('Only mac is supported right now')
-        }
-    }
-}