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imdsHost);\n\n const rawHeaders: Record<string, string> = {\n Accept: \"application/json\",\n // intentionally leave out the Metadata header to invoke an error from IMDS endpoint.\n };\n\n return {\n // intentionally not including any query\n url: `${url}`,\n method: \"GET\",\n headers: createHttpHeaders(rawHeaders),\n };\n}\n\n/**\n * Defines how to determine whether the Azure IMDS MSI is available.\n *\n * Actually getting the token once we determine IMDS is available is handled by MSAL.\n */\nexport const imdsMsi = {\n name: \"imdsMsi\",\n async isAvailable(options: {\n scopes: string | string[];\n identityClient?: IdentityClient;\n clientId?: string;\n resourceId?: string;\n getTokenOptions?: GetTokenOptions;\n }): Promise<boolean> {\n const { scopes, identityClient, getTokenOptions } = options;\n const resource = mapScopesToResource(scopes);\n if (!resource) {\n logger.info(`${msiName}: Unavailable. Multiple scopes are not supported.`);\n return false;\n }\n\n // if the PodIdentityEndpoint environment variable was set no need to probe the endpoint, it can be assumed to exist\n if (process.env.AZURE_POD_IDENTITY_AUTHORITY_HOST) {\n return true;\n }\n\n if (!identityClient) {\n throw new Error(\"Missing IdentityClient\");\n }\n\n const requestOptions = prepareInvalidRequestOptions(resource);\n\n return tracingClient.withSpan(\n \"ManagedIdentityCredential-pingImdsEndpoint\",\n getTokenOptions ?? {},\n async (updatedOptions) => {\n requestOptions.tracingOptions = updatedOptions.tracingOptions;\n\n // Create a request with a timeout since we expect that\n // not having a \"Metadata\" header should cause an error to be\n // returned quickly from the endpoint, proving its availability.\n const request = createPipelineRequest(requestOptions);\n\n // Default to 1000 if the default of 0 is used.\n // Negative values can still be used to disable the timeout.\n request.timeout = updatedOptions.requestOptions?.timeout || 1000;\n\n // This MSI uses the imdsEndpoint to get the token, which only uses http://\n request.allowInsecureConnection = true;\n let response: PipelineResponse;\n try {\n logger.info(`${msiName}: Pinging the Azure IMDS endpoint`);\n response = await identityClient.sendRequest(request);\n } catch (err: unknown) {\n // If the request failed, or Node.js was unable to establish a connection,\n // or the host was down, we'll assume the IMDS endpoint isn't available.\n if (isError(err)) {\n logger.verbose(`${msiName}: Caught error ${err.name}: ${err.message}`);\n }\n // This is a special case for Docker Desktop which responds with a 403 with a message that contains \"A socket operation was attempted to an unreachable network\" or \"A socket operation was attempted to an unreachable host\"\n // rather than just timing out, as expected.\n logger.info(`${msiName}: The Azure IMDS endpoint is unavailable`);\n return false;\n }\n if (response.status === 403) {\n if (response.bodyAsText?.includes(\"unreachable\")) {\n logger.info(`${msiName}: The Azure IMDS endpoint is unavailable`);\n logger.info(`${msiName}: ${response.bodyAsText}`);\n return false;\n }\n }\n // If we received any response, the endpoint is available\n logger.info(`${msiName}: The Azure IMDS endpoint is available`);\n return true;\n },\n );\n },\n};\n"]}
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