Roo-Code/src/providers/ClaudeDevProvider.ts

import { Uri, Webview } from "vscode"
//import * as weather from "weather-js"
import * as vscode from "vscode"
import { ClaudeDev } from "../ClaudeDev"
import { ClaudeMessage, ExtensionMessage } from "../shared/ExtensionMessage"
import { WebviewMessage } from "../shared/WebviewMessage"
import { Anthropic } from "@anthropic-ai/sdk"

/*
https://github.com/microsoft/vscode-webview-ui-toolkit-samples/blob/main/default/weather-webview/src/providers/WeatherViewProvider.ts

https://github.com/KumarVariable/vscode-extension-sidebar-html/blob/master/src/customSidebarViewProvider.ts
*/

export class ClaudeDevProvider implements vscode.WebviewViewProvider {
	public static readonly viewType = "claude-dev.ClaudeDevProvider"
	private disposables: vscode.Disposable[] = []
	private view?: vscode.WebviewView | vscode.WebviewPanel
	private providerInstanceIdentifier = Date.now()
	private claudeDev?: ClaudeDev
	private latestAnnouncementId = "jul-25-2024" // update to some unique identifier when we add a new announcement

	constructor(private readonly context: vscode.ExtensionContext) {}

	/*
	VSCode extensions use the disposable pattern to clean up resources when the sidebar/editor tab is closed by the user or system. This applies to event listening, commands, interacting with the UI, etc.
	- https://vscode-docs.readthedocs.io/en/stable/extensions/patterns-and-principles/
	- https://github.com/microsoft/vscode-extension-samples/blob/main/webview-sample/src/extension.ts
	*/
	async dispose() {
		console.log("Disposing provider...")
		await this.clearTask() // clears claudeDev, api conversation history, and webview claude messages
		console.log("Cleared task")
		if (this.view && "dispose" in this.view) {
			this.view.dispose()
			console.log("Disposed webview")
		}
		while (this.disposables.length) {
			const x = this.disposables.pop()
			if (x) {
				x.dispose()
			}
		}
		console.log("Disposed disposables")
	}

	resolveWebviewView(
		webviewView: vscode.WebviewView | vscode.WebviewPanel
		//context: vscode.WebviewViewResolveContext<unknown>, used to recreate a deallocated webview, but we don't need this since we use retainContextWhenHidden
		//token: vscode.CancellationToken
	): void | Thenable<void> {
		this.view = webviewView

		webviewView.webview.options = {
			// Allow scripts in the webview
			enableScripts: true,
			localResourceRoots: [this.context.extensionUri],
		}
		webviewView.webview.html = this.getHtmlContent(webviewView.webview)

		// Sets up an event listener to listen for messages passed from the webview view context
		// and executes code based on the message that is recieved
		this.setWebviewMessageListener(webviewView.webview)

		// Logs show up in bottom panel > Debug Console
		//console.log("registering listener")

		// Listen for when the panel becomes visible
		// https://github.com/microsoft/vscode-discussions/discussions/840
		if ("onDidChangeViewState" in webviewView) {
			// WebviewView and WebviewPanel have all the same properties except for this visibility listener
			// panel
			webviewView.onDidChangeViewState(
				() => {
					if (this.view?.visible) {
						this.postMessageToWebview({ type: "action", action: "didBecomeVisible" })
					}
				},
				null,
				this.disposables
			)
		} else if ("onDidChangeVisibility" in webviewView) {
			// sidebar
			webviewView.onDidChangeVisibility(
				() => {
					if (this.view?.visible) {
						this.postMessageToWebview({ type: "action", action: "didBecomeVisible" })
					}
				},
				null,
				this.disposables
			)
		}

		// Listen for when the view is disposed
		// This happens when the user closes the view or when the view is closed programmatically
		webviewView.onDidDispose(
			async () => {
				await this.dispose()
			},
			null,
			this.disposables
		)

		// Listen for when color changes
		vscode.workspace.onDidChangeConfiguration(
			(e) => {
				if (e.affectsConfiguration("workbench.colorTheme")) {
					// Sends latest theme name to webview
					this.postStateToWebview()
				}
			},
			null,
			this.disposables
		)

		// if the extension is starting a new session, clear previous task state
		this.clearTask()

		// Clear previous version's (0.0.6) claudeMessage cache from workspace state. We now store in global state with a unique identifier for each provider instance. We need to store globally rather than per workspace to eventually implement task history
		this.updateWorkspaceState("claudeMessages", undefined)
	}

	async tryToInitClaudeDevWithTask(task: string) {
		await this.clearTask() // ensures that an exising task doesn't exist before starting a new one, although this shouldn't be possible since user must clear task before starting a new one
		const [apiKey, maxRequestsPerTask] = await Promise.all([
			this.getSecret("apiKey") as Promise<string | undefined>,
			this.getGlobalState("maxRequestsPerTask") as Promise<number | undefined>,
		])
		if (this.view && apiKey) {
			this.claudeDev = new ClaudeDev(this, task, apiKey, maxRequestsPerTask)
		}
	}

	// Send any JSON serializable data to the react app
	async postMessageToWebview(message: ExtensionMessage) {
		await this.view?.webview.postMessage(message)
	}

	/**
	 * Defines and returns the HTML that should be rendered within the webview panel.
	 *
	 * @remarks This is also the place where references to the React webview build files
	 * are created and inserted into the webview HTML.
	 *
	 * @param webview A reference to the extension webview
	 * @param extensionUri The URI of the directory containing the extension
	 * @returns A template string literal containing the HTML that should be
	 * rendered within the webview panel
	 */
	private getHtmlContent(webview: vscode.Webview): string {
		// Get the local path to main script run in the webview,
		// then convert it to a uri we can use in the webview.

		// The CSS file from the React build output
		const stylesUri = getUri(webview, this.context.extensionUri, [
			"webview-ui",
			"build",
			"static",
			"css",
			"main.css",
		])
		// The JS file from the React build output
		const scriptUri = getUri(webview, this.context.extensionUri, ["webview-ui", "build", "static", "js", "main.js"])

		// The codicon font from the React build output
		// https://github.com/microsoft/vscode-extension-samples/blob/main/webview-codicons-sample/src/extension.ts
		// we installed this package in the extension so that we can access it how its intended from the extension (the font file is likely bundled in vscode), and we just import the css fileinto our react app we don't have access to it
		// don't forget to add font-src ${webview.cspSource};
		const codiconsUri = getUri(webview, this.context.extensionUri, [
			"node_modules",
			"@vscode",
			"codicons",
			"dist",
			"codicon.css",
		])

		// const scriptUri = webview.asWebviewUri(vscode.Uri.joinPath(this._extensionUri, "assets", "main.js"))

		// const styleResetUri = webview.asWebviewUri(vscode.Uri.joinPath(this._extensionUri, "assets", "reset.css"))
		// const styleVSCodeUri = webview.asWebviewUri(vscode.Uri.joinPath(this._extensionUri, "assets", "vscode.css"))

		// // Same for stylesheet
		// const stylesheetUri = webview.asWebviewUri(vscode.Uri.joinPath(this._extensionUri, "assets", "main.css"))

		// Use a nonce to only allow a specific script to be run.
		/*
        content security policy of your webview to only allow scripts that have a specific nonce
        create a content security policy meta tag so that only loading scripts with a nonce is allowed
        As your extension grows you will likely want to add custom styles, fonts, and/or images to your webview. If you do, you will need to update the content security policy meta tag to explicity allow for these resources. E.g.
                <meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src ${webview.cspSource}; font-src ${webview.cspSource}; img-src ${webview.cspSource} https:; script-src 'nonce-${nonce}';">


        in meta tag we add nonce attribute: A cryptographic nonce (only used once) to allow scripts. The server must generate a unique nonce value each time it transmits a policy. It is critical to provide a nonce that cannot be guessed as bypassing a resource's policy is otherwise trivial.
        */
		const nonce = getNonce()

		// Tip: Install the es6-string-html VS Code extension to enable code highlighting below
		return /*html*/ `
        <!DOCTYPE html>
        <html lang="en">
          <head>
            <meta charset="utf-8">
            <meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">
            <meta name="theme-color" content="#000000">
            <meta http-equiv="Content-Security-Policy" content="default-src 'none'; font-src ${webview.cspSource}; style-src ${webview.cspSource}; script-src 'nonce-${nonce}';">
            <link rel="stylesheet" type="text/css" href="${stylesUri}">
			<link href="${codiconsUri}" rel="stylesheet" />
            <title>Claude Dev</title>
          </head>
          <body>
            <noscript>You need to enable JavaScript to run this app.</noscript>
            <div id="root"></div>
            <script nonce="${nonce}" src="${scriptUri}"></script>
          </body>
        </html>
      `
	}

	/**
	 * Sets up an event listener to listen for messages passed from the webview context and
	 * executes code based on the message that is recieved.
	 *
	 * @param webview A reference to the extension webview
	 */
	private setWebviewMessageListener(webview: vscode.Webview) {
		webview.onDidReceiveMessage(
			async (message: WebviewMessage) => {
				switch (message.type) {
					case "webviewDidLaunch":
						await this.postStateToWebview()
						break
					case "newTask":
						// Code that should run in response to the hello message command
						//vscode.window.showInformationMessage(message.text!)

						// Send a message to our webview.
						// You can send any JSON serializable data.
						// Could also do this in extension .ts
						//this.postMessageToWebview({ type: "text", text: `Extension: ${Date.now()}` })
						// initializing new instance of ClaudeDev will make sure that any agentically running promises in old instance don't affect our new task. this essentially creates a fresh slate for the new task
						await this.tryToInitClaudeDevWithTask(message.text!)
						break
					case "apiKey":
						await this.storeSecret("apiKey", message.text!)
						this.claudeDev?.updateApiKey(message.text!)
						await this.postStateToWebview()
						break
					case "maxRequestsPerTask":
						let result: number | undefined = undefined
						if (message.text && message.text.trim()) {
							const num = Number(message.text)
							if (!isNaN(num)) {
								result = num
							}
						}
						await this.updateGlobalState("maxRequestsPerTask", result)
						this.claudeDev?.updateMaxRequestsPerTask(result)
						await this.postStateToWebview()
						break
					case "askResponse":
						this.claudeDev?.handleWebviewAskResponse(message.askResponse!, message.text)
						break
					case "clearTask":
						// newTask will start a new task with a given task text, while clear task resets the current session and allows for a new task to be started
						await this.clearTask()
						await this.postStateToWebview()
						break
					case "didShowAnnouncement":
						await this.updateGlobalState("lastShownAnnouncementId", this.latestAnnouncementId)
						await this.postStateToWebview()
						break
					// Add more switch case statements here as more webview message commands
					// are created within the webview context (i.e. inside media/main.js)
				}
			},
			null,
			this.disposables
		)
	}

	async postStateToWebview() {
		const [apiKey, maxRequestsPerTask, claudeMessages, lastShownAnnouncementId] = await Promise.all([
			this.getSecret("apiKey") as Promise<string | undefined>,
			this.getGlobalState("maxRequestsPerTask") as Promise<number | undefined>,
			this.getClaudeMessages(),
			this.getGlobalState("lastShownAnnouncementId") as Promise<string | undefined>,
		])
		this.postMessageToWebview({
			type: "state",
			state: {
				apiKey,
				maxRequestsPerTask,
				themeName: vscode.workspace.getConfiguration("workbench").get<string>("colorTheme"),
				claudeMessages,
				shouldShowAnnouncement: lastShownAnnouncementId !== this.latestAnnouncementId,
			},
		})
	}

	async clearTask() {
		if (this.claudeDev) {
			this.claudeDev.abort = true // will stop any agentically running promises
			this.claudeDev = undefined // removes reference to it, so once promises end it will be garbage collected
		}
		await this.setApiConversationHistory(undefined)
		await this.setClaudeMessages(undefined)
	}

	// Caching mechanism to keep track of webview messages + API conversation history per provider instance

	/*
	Now that we use retainContextWhenHidden, we don't have to store a cache of claude messages in the user's state, but we do to reduce memory footprint in long conversations.

	- We have to be careful of what state is shared between ClaudeDevProvider instances since there could be multiple instances of the extension running at once. For example when we cached claude messages using the same key, two instances of the extension could end up using the same key and overwriting each other's messages.
	- Some state does need to be shared between the instances, i.e. the API key--however there doesn't seem to be a good way to notfy the other instances that the API key has changed.

	We need to use a unique identifier for each ClaudeDevProvider instance's message cache since we could be running several instances of the extension outside of just the sidebar i.e. in editor panels.

	For now since we don't need to store task history, we'll just use an identifier unique to this provider instance (since there can be several provider instances open at once).
	However in the future when we implement task history, we'll need to use a unique identifier for each task. As well as manage a data structure that keeps track of task history with their associated identifiers and the task message itself, to present in a 'Task History' view.
	Task history is a significant undertaking as it would require refactoring how we wait for ask responses--it would need to be a hidden claudeMessage, so that user's can resume tasks that ended with an ask.
	*/

	getClaudeMessagesStateKey() {
		return `claudeMessages-${this.providerInstanceIdentifier}`
	}

	getApiConversationHistoryStateKey() {
		return `apiConversationHistory-${this.providerInstanceIdentifier}`
	}

	// claude messages to present in the webview

	async getClaudeMessages(): Promise<ClaudeMessage[]> {
		const messages = (await this.getGlobalState(this.getClaudeMessagesStateKey())) as ClaudeMessage[]
		return messages || []
	}

	async setClaudeMessages(messages: ClaudeMessage[] | undefined) {
		await this.updateGlobalState(this.getClaudeMessagesStateKey(), messages)
	}

	async addClaudeMessage(message: ClaudeMessage): Promise<ClaudeMessage[]> {
		const messages = await this.getClaudeMessages()
		messages.push(message)
		await this.setClaudeMessages(messages)
		return messages
	}

	// conversation history to send in API requests

	async getApiConversationHistory(): Promise<Anthropic.MessageParam[]> {
		const history = (await this.getGlobalState(
			this.getApiConversationHistoryStateKey()
		)) as Anthropic.MessageParam[]
		return history || []
	}

	async setApiConversationHistory(history: Anthropic.MessageParam[] | undefined) {
		await this.updateGlobalState(this.getApiConversationHistoryStateKey(), history)
	}

	async addMessageToApiConversationHistory(message: Anthropic.MessageParam): Promise<Anthropic.MessageParam[]> {
		const history = await this.getApiConversationHistory()
		history.push(message)
		await this.setApiConversationHistory(history)
		return history
	}

	/*
	Storage
	https://dev.to/kompotkot/how-to-use-secretstorage-in-your-vscode-extensions-2hco
	https://www.eliostruyf.com/devhack-code-extension-storage-options/
	*/

	// global

	private async updateGlobalState(key: string, value: any) {
		await this.context.globalState.update(key, value)
	}

	private async getGlobalState(key: string) {
		return await this.context.globalState.get(key)
	}

	// workspace

	private async updateWorkspaceState(key: string, value: any) {
		await this.context.workspaceState.update(key, value)
	}

	private async getWorkspaceState(key: string) {
		return await this.context.workspaceState.get(key)
	}

	// private async clearState() {
	// 	this.context.workspaceState.keys().forEach((key) => {
	// 		this.context.workspaceState.update(key, undefined)
	// 	})
	// 	this.context.globalState.keys().forEach((key) => {
	// 		this.context.globalState.update(key, undefined)
	// 	})
	// 	this.context.secrets.delete("apiKey")
	// }

	// secrets

	private async storeSecret(key: string, value: any) {
		await this.context.secrets.store(key, value)
	}

	private async getSecret(key: string) {
		return await this.context.secrets.get(key)
	}
}

/**
 * A helper function that returns a unique alphanumeric identifier called a nonce.
 *
 * @remarks This function is primarily used to help enforce content security
 * policies for resources/scripts being executed in a webview context.
 *
 * @returns A nonce
 */
export function getNonce() {
	let text = ""
	const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
	for (let i = 0; i < 32; i++) {
		text += possible.charAt(Math.floor(Math.random() * possible.length))
	}
	return text
}

/**
 * A helper function which will get the webview URI of a given file or resource.
 *
 * @remarks This URI can be used within a webview's HTML as a link to the
 * given file/resource.
 *
 * @param webview A reference to the extension webview
 * @param extensionUri The URI of the directory containing the extension
 * @param pathList An array of strings representing the path to a file/resource
 * @returns A URI pointing to the file/resource
 */
export function getUri(webview: Webview, extensionUri: Uri, pathList: string[]) {
	return webview.asWebviewUri(Uri.joinPath(extensionUri, ...pathList))
}