feat(amazonq): Log attribution notice when downloading language server (aws#7193)

## Problem:

Legal requires us to log the attribution notice when downloading the
language server. We do not currently do this.

## Solution:

- What our message looks like: `lsp: Installing 'AmazonQ' Language
Server v0.1.0-alpha.100 to
/Users/nkomonen/Library/Caches/aws/toolkits/language-servers/AmazonQ/0.1.0-alpha.100
(Attribution notice can be found at
https://dhi0h88q3j9q6.cloudfront.net/6a0c7aa8-8b63-43a7-b14b-ee7594a29c9d/THIRD_PARTY_LICENSES)`
- This log message is in the generic part of our LSP downloader, and
will show for all LSPs downloaded. The link to the attribution notice is
already part of the manifest, so we grab it from there.

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Signed-off-by: nkomonen-amazon <[email protected]>

Author: nkomonen-amazon

packages/core/src/shared/lsp/baseLspInstaller.ts

@@ -41,7 +41,7 @@ export abstract class BaseLspInstaller<T extends ResourcePaths = ResourcePaths,
         const manifest = await new ManifestResolver(manifestUrl, id, suppressPromptPrefix).resolve()
         const installationResult = await new LanguageServerResolver(
             manifest,
-            id,
+            id, // TODO: We may want a display name instead of the ID
             new Range(supportedVersions, {
                 includePrerelease: true,
             }),

packages/core/src/shared/lsp/lspResolver.ts

@@ -135,7 +135,7 @@ export class LanguageServerResolver {
     ): Promise<LspResult> {
         const timeout = await this.showDownloadProgress()
         try {
-            if (await this.downloadRemoteTargetContent(targetContents, latestVersion.serverVersion, timeout)) {
+            if (await this.downloadRemoteTargetContent(targetContents, latestVersion, timeout)) {
                 return {
                     location: 'remote',
                     version: latestVersion.serverVersion,
@@ -236,8 +236,8 @@ export class LanguageServerResolver {
      *  true, if all of the contents were successfully downloaded and unzipped
      *  false, if any of the contents failed to download or unzip
      */
-    private async downloadRemoteTargetContent(contents: TargetContent[], version: string, timeout: Timeout) {
-        const downloadDirectory = this.getDownloadDirectory(version)
+    private async downloadRemoteTargetContent(contents: TargetContent[], lspVersion: LspVersion, timeout: Timeout) {
+        const downloadDirectory = this.getDownloadDirectory(lspVersion.serverVersion)
 
         if (!(await fs.existsDir(downloadDirectory))) {
             await fs.mkdir(downloadDirectory)
@@ -273,6 +273,12 @@ export class LanguageServerResolver {
 
         const filesToDownload = await lspSetupStage('validate', async () => (await Promise.all(verifyTasks)).flat())
 
+        // We were instructed by legal to show this message
+        const thirdPartyLicenses = lspVersion.thirdPartyLicenses
+        logger.info(
+            `Installing '${this.lsName}' Language Server v${lspVersion.serverVersion} to: ${downloadDirectory}${thirdPartyLicenses ? ` (Attribution notice can be found at ${thirdPartyLicenses})` : ''}`
+        )
+
         for (const file of filesToDownload) {
             await fs.writeFile(`${downloadDirectory}/${file.filename}`, file.data)
         }

packages/core/src/shared/lsp/types.ts

@@ -72,6 +72,10 @@ export interface LspVersion {
     serverVersion: string
     isDelisted: boolean
     targets: Target[]
+    /**
+     * I'm not sure if this **always** exists (couldn't find it in the spec)
+     */
+    thirdPartyLicenses?: string
 }
 
 export interface Manifest {