{"version":3,"file":"NativeMessageHandler.js","sources":["../../../src/broker/nativeBroker/NativeMessageHandler.ts"],"sourcesContent":["/*\n * Copyright (c) Microsoft Corporation. All rights reserved.\n * Licensed under the MIT License.\n */\n\nimport { NativeConstants, NativeExtensionMethod } from \"../../utils/BrowserConstants\";\nimport { Logger, AuthError, AuthenticationScheme } from \"@azure/msal-common\";\nimport { NativeExtensionRequest, NativeExtensionRequestBody } from \"./NativeRequest\";\nimport { NativeAuthError } from \"../../error/NativeAuthError\";\nimport { BrowserAuthError } from \"../../error/BrowserAuthError\";\nimport { BrowserConfiguration } from \"../../config/Configuration\";\n\ntype ResponseResolvers<T> = {\n    resolve: (value:T|PromiseLike<T>) => void;\n    reject: (value:AuthError|Error|PromiseLike<Error>|PromiseLike<AuthError>)  => void;\n};\n\nexport class NativeMessageHandler {\n    private extensionId: string | undefined;\n    private extensionVersion: string | undefined;\n    private logger: Logger;\n    private handshakeTimeoutMs: number;\n    private responseId: number;\n    private timeoutId: number | undefined;\n    private resolvers: Map<number, ResponseResolvers<object>>;\n    private handshakeResolvers: Map<number, ResponseResolvers<void>>;\n    private messageChannel: MessageChannel;\n    private windowListener: (event: MessageEvent) => void;\n\n    constructor(logger: Logger, handshakeTimeoutMs: number, extensionId?: string) {\n        this.logger = logger;\n        this.handshakeTimeoutMs = handshakeTimeoutMs;\n        this.extensionId = extensionId;\n        this.resolvers = new Map(); // Used for non-handshake messages\n        this.handshakeResolvers = new Map(); // Used for handshake messages\n        this.responseId = 0;\n        this.messageChannel = new MessageChannel();\n        this.windowListener = this.onWindowMessage.bind(this); // Window event callback doesn't have access to 'this' unless it's bound\n    }\n\n    /**\n     * Sends a given message to the extension and resolves with the extension response\n     * @param body \n     */\n    async sendMessage(body: NativeExtensionRequestBody): Promise<object> {\n        this.logger.trace(\"NativeMessageHandler - sendMessage called.\");\n        const req: NativeExtensionRequest = {\n            channel: NativeConstants.CHANNEL_ID,\n            extensionId: this.extensionId,\n            responseId: this.responseId++,\n            body: body\n        };\n\n        this.logger.trace(\"NativeMessageHandler - Sending request to browser extension\");\n        this.logger.tracePii(`NativeMessageHandler - Sending request to browser extension: ${JSON.stringify(req)}`);\n        this.messageChannel.port1.postMessage(req);\n\n        return new Promise((resolve, reject) => {\n            this.resolvers.set(req.responseId, {resolve, reject});\n        });\n    }\n\n    /**\n     * Returns an instance of the MessageHandler that has successfully established a connection with an extension\n     * @param logger \n     * @param handshakeTimeoutMs\n     */\n    static async createProvider(logger: Logger, handshakeTimeoutMs: number): Promise<NativeMessageHandler> {\n        logger.trace(\"NativeMessageHandler - createProvider called.\");\n        try {\n            const preferredProvider = new NativeMessageHandler(logger, handshakeTimeoutMs, NativeConstants.PREFERRED_EXTENSION_ID);\n            await preferredProvider.sendHandshakeRequest();\n            return preferredProvider;\n        } catch (e) {\n            // If preferred extension fails for whatever reason, fallback to using any installed extension\n            const backupProvider = new NativeMessageHandler(logger, handshakeTimeoutMs);\n            await backupProvider.sendHandshakeRequest();\n            return backupProvider;\n        }\n    }\n\n    /**\n     * Send handshake request helper.\n     */\n    private async sendHandshakeRequest(): Promise<void> {\n        this.logger.trace(\"NativeMessageHandler - sendHandshakeRequest called.\");\n        // Register this event listener before sending handshake\n        window.addEventListener(\"message\", this.windowListener, false); // false is important, because content script message processing should work first\n\n        const req: NativeExtensionRequest = {\n            channel: NativeConstants.CHANNEL_ID,\n            extensionId: this.extensionId,\n            responseId: this.responseId++,\n\n            body: {\n                method: NativeExtensionMethod.HandshakeRequest\n            }\n        };\n\n        this.messageChannel.port1.onmessage = (event) => {\n            this.onChannelMessage(event);\n        };\n\n        window.postMessage(req, window.origin, [this.messageChannel.port2]);\n\n        return new Promise((resolve, reject) => {\n            this.handshakeResolvers.set(req.responseId, {resolve, reject});\n            this.timeoutId = window.setTimeout(() => {\n                /*\n                 * Throw an error if neither HandshakeResponse nor original Handshake request are received in a reasonable timeframe.\n                 * This typically suggests an event handler stopped propagation of the Handshake request but did not respond to it on the MessageChannel port\n                 */\n                window.removeEventListener(\"message\", this.windowListener, false);\n                this.messageChannel.port1.close();\n                this.messageChannel.port2.close();\n                reject(BrowserAuthError.createNativeHandshakeTimeoutError());\n                this.handshakeResolvers.delete(req.responseId);\n            }, this.handshakeTimeoutMs); // Use a reasonable timeout in milliseconds here\n        });\n    }\n\n    /**\n     * Invoked when a message is posted to the window. If a handshake request is received it means the extension is not installed.\n     * @param event \n     */\n    private onWindowMessage(event: MessageEvent): void {\n        this.logger.trace(\"NativeMessageHandler - onWindowMessage called\");\n        // We only accept messages from ourselves\n        if (event.source !== window) {\n            return;\n        }\n\n        const request = event.data;\n\n        if (!request.channel || request.channel !== NativeConstants.CHANNEL_ID) {\n            return;\n        }\n\n        if (request.extensionId && request.extensionId !== this.extensionId) {\n            return;\n        }\n\n        if (request.body.method === NativeExtensionMethod.HandshakeRequest) {\n            // If we receive this message back it means no extension intercepted the request, meaning no extension supporting handshake protocol is installed\n            this.logger.verbose(request.extensionId ? `Extension with id: ${request.extensionId} not installed` : \"No extension installed\");\n            clearTimeout(this.timeoutId);\n            this.messageChannel.port1.close();\n            this.messageChannel.port2.close();\n            window.removeEventListener(\"message\", this.windowListener, false);\n            const handshakeResolver = this.handshakeResolvers.get(request.responseId);\n            if (handshakeResolver) {\n                handshakeResolver.reject(BrowserAuthError.createNativeExtensionNotInstalledError());\n            }\n        }\n    }\n\n    /**\n     * Invoked when a message is received from the extension on the MessageChannel port\n     * @param event \n     */\n    private onChannelMessage(event: MessageEvent): void {\n        this.logger.trace(\"NativeMessageHandler - onChannelMessage called.\");\n        const request = event.data;\n        \n        const resolver = this.resolvers.get(request.responseId);\n        const handshakeResolver = this.handshakeResolvers.get(request.responseId);\n\n        try {\n            const method = request.body.method;\n            \n            if (method === NativeExtensionMethod.Response) {\n                if (!resolver) {\n                    return;\n                }\n                const response = request.body.response;\n                this.logger.trace(\"NativeMessageHandler - Received response from browser extension\");\n                this.logger.tracePii(`NativeMessageHandler - Received response from browser extension: ${JSON.stringify(response)}`);\n                if (response.status !== \"Success\") {\n                    resolver.reject(NativeAuthError.createError(response.code, response.description, response.ext));\n                } else if (response.result) {\n                    if (response.result[\"code\"] && response.result[\"description\"]) {\n                        resolver.reject(NativeAuthError.createError(response.result[\"code\"], response.result[\"description\"], response.result[\"ext\"]));\n                    } else {\n                        resolver.resolve(response.result);\n                    }\n                } else {\n                    throw AuthError.createUnexpectedError(\"Event does not contain result.\");\n                }\n                this.resolvers.delete(request.responseId);\n            } else if (method === NativeExtensionMethod.HandshakeResponse) {\n                if (!handshakeResolver) {\n                    return;\n                }\n                clearTimeout(this.timeoutId); // Clear setTimeout\n                window.removeEventListener(\"message\", this.windowListener, false); // Remove 'No extension' listener\n                this.extensionId = request.extensionId;\n                this.extensionVersion = request.body.version;\n                this.logger.verbose(`NativeMessageHandler - Received HandshakeResponse from extension: ${this.extensionId}`);\n\n                handshakeResolver.resolve();\n                this.handshakeResolvers.delete(request.responseId);\n            } \n            // Do nothing if method is not Response or HandshakeResponse\n        } catch (err) {\n            this.logger.error(\"Error parsing response from WAM Extension\");\n            this.logger.errorPii(`Error parsing response from WAM Extension: ${err.toString()}`);\n            this.logger.errorPii(`Unable to parse ${event}`);\n\n            if (resolver) {\n                resolver.reject(err as AuthError);\n            } else if (handshakeResolver) {\n                handshakeResolver.reject(err as AuthError);\n            }\n        }\n    }\n\n    /**\n     * Returns the Id for the browser extension this handler is communicating with\n     * @returns \n     */\n    getExtensionId(): string | undefined {\n        return this.extensionId;\n    }\n\n    /**\n     * Returns the version for the browser extension this handler is communicating with\n     * @returns \n     */\n    getExtensionVersion(): string | undefined {\n        return this.extensionVersion;\n    }\n    \n    /**\n     * Returns boolean indicating whether or not the request should attempt to use native broker\n     * @param logger\n     * @param config\n     * @param nativeExtensionProvider\n     * @param authenticationScheme \n     */\n    static isNativeAvailable(config: BrowserConfiguration, logger: Logger, nativeExtensionProvider?: NativeMessageHandler, authenticationScheme?: AuthenticationScheme): boolean {\n        logger.trace(\"isNativeAvailable called\");\n        if (!config.system.allowNativeBroker) {\n            logger.trace(\"isNativeAvailable: allowNativeBroker is not enabled, returning false\");\n            // Developer disabled WAM\n            return false;\n        }\n\n        if (!nativeExtensionProvider) {\n            logger.trace(\"isNativeAvailable: WAM extension provider is not initialized, returning false\");\n            // Extension is not available\n            return false;\n        }\n\n        if (authenticationScheme) {\n            switch(authenticationScheme) {\n                case AuthenticationScheme.BEARER:\n                case AuthenticationScheme.POP:\n                    logger.trace(\"isNativeAvailable: authenticationScheme is supported, returning true\");\n                    return true;\n                default:\n                    logger.trace(\"isNativeAvailable: authenticationScheme is not supported, returning false\");\n                    return false;\n            }\n        }\n\n        return true;\n    }\n} 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