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aws-cdk

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CDK Toolkit, the command line tool for CDK apps

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.EvaluateCloudFormationTemplate = exports.CfnEvaluationException = exports.LazyLookupExport = exports.LookupExportError = exports.LazyListStackResources = void 0; class LazyListStackResources { constructor(sdk, stackName) { this.sdk = sdk; this.stackName = stackName; } async listStackResources() { if (this.stackResources === undefined) { this.stackResources = this.getStackResources(undefined); } return this.stackResources; } async getStackResources(nextToken) { const ret = new Array(); return this.sdk.cloudFormation().listStackResources({ StackName: this.stackName, NextToken: nextToken, }).promise().then(async (stackResourcesResponse) => { ret.push(...(stackResourcesResponse.StackResourceSummaries ?? [])); if (stackResourcesResponse.NextToken) { ret.push(...await this.getStackResources(stackResourcesResponse.NextToken)); } return ret; }); } } exports.LazyListStackResources = LazyListStackResources; class LookupExportError extends Error { } exports.LookupExportError = LookupExportError; class LazyLookupExport { constructor(sdk) { this.sdk = sdk; this.cachedExports = {}; } async lookupExport(name) { if (this.cachedExports[name]) { return this.cachedExports[name]; } for await (const cfnExport of this.listExports()) { if (!cfnExport.Name) { continue; // ignore any result that omits a name } this.cachedExports[cfnExport.Name] = cfnExport; if (cfnExport.Name === name) { return cfnExport; } } return undefined; // export not found } async *listExports() { let nextToken = undefined; while (true) { const response = await this.sdk.cloudFormation().listExports({ NextToken: nextToken, }).promise(); for (const cfnExport of response.Exports ?? []) { yield cfnExport; } if (!response.NextToken) { return; } nextToken = response.NextToken; } } } exports.LazyLookupExport = LazyLookupExport; class CfnEvaluationException extends Error { } exports.CfnEvaluationException = CfnEvaluationException; class EvaluateCloudFormationTemplate { constructor(props) { this.stackName = props.stackName; this.template = props.template; this.context = { 'AWS::AccountId': props.account, 'AWS::Region': props.region, 'AWS::Partition': props.partition, ...props.parameters, }; this.account = props.account; this.region = props.region; this.partition = props.partition; this.urlSuffix = props.urlSuffix; this.sdk = props.sdk; // We need names of nested stack so we can evaluate cross stack references this.nestedStackNames = props.nestedStackNames ?? {}; // The current resources of the Stack. // We need them to figure out the physical name of a resource in case it wasn't specified by the user. // We fetch it lazily, to save a service call, in case all hotswapped resources have their physical names set. this.stackResources = new LazyListStackResources(this.sdk, this.stackName); // CloudFormation Exports lookup to be able to resolve Fn::ImportValue intrinsics in template this.lookupExport = new LazyLookupExport(this.sdk); } // clones current EvaluateCloudFormationTemplate object, but updates the stack name async createNestedEvaluateCloudFormationTemplate(stackName, nestedTemplate, nestedStackParameters) { const evaluatedParams = await this.evaluateCfnExpression(nestedStackParameters); return new EvaluateCloudFormationTemplate({ stackName, template: nestedTemplate, parameters: evaluatedParams, account: this.account, region: this.region, partition: this.partition, urlSuffix: this.urlSuffix, sdk: this.sdk, nestedStackNames: this.nestedStackNames, }); } async establishResourcePhysicalName(logicalId, physicalNameInCfnTemplate) { if (physicalNameInCfnTemplate != null) { try { return await this.evaluateCfnExpression(physicalNameInCfnTemplate); } catch (e) { // If we can't evaluate the resource's name CloudFormation expression, // just look it up in the currently deployed Stack if (!(e instanceof CfnEvaluationException)) { throw e; } } } return this.findPhysicalNameFor(logicalId); } async findPhysicalNameFor(logicalId) { const stackResources = await this.stackResources.listStackResources(); return stackResources.find(sr => sr.LogicalResourceId === logicalId)?.PhysicalResourceId; } async findLogicalIdForPhysicalName(physicalName) { const stackResources = await this.stackResources.listStackResources(); return stackResources.find(sr => sr.PhysicalResourceId === physicalName)?.LogicalResourceId; } findReferencesTo(logicalId) { const ret = new Array(); for (const [resourceLogicalId, resourceDef] of Object.entries(this.template?.Resources ?? {})) { if (logicalId !== resourceLogicalId && this.references(logicalId, resourceDef)) { ret.push({ ...resourceDef, LogicalId: resourceLogicalId, }); } } return ret; } async evaluateCfnExpression(cfnExpression) { const self = this; /** * Evaluates CloudFormation intrinsic functions * * Note that supported intrinsic functions are documented in README.md -- please update * list of supported functions when adding new evaluations * * See: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference.html */ class CfnIntrinsics { evaluateIntrinsic(intrinsic) { const intrinsicFunc = this[intrinsic.name]; if (!intrinsicFunc) { throw new CfnEvaluationException(`CloudFormation function ${intrinsic.name} is not supported`); } const argsAsArray = Array.isArray(intrinsic.args) ? intrinsic.args : [intrinsic.args]; return intrinsicFunc.apply(this, argsAsArray); } async 'Fn::Join'(separator, args) { const evaluatedArgs = await self.evaluateCfnExpression(args); return evaluatedArgs.join(separator); } async 'Fn::Split'(separator, args) { const evaluatedArgs = await self.evaluateCfnExpression(args); return evaluatedArgs.split(separator); } async 'Fn::Select'(index, args) { const evaluatedArgs = await self.evaluateCfnExpression(args); return evaluatedArgs[index]; } async 'Ref'(logicalId) { const refTarget = await self.findRefTarget(logicalId); if (refTarget) { return refTarget; } else { throw new CfnEvaluationException(`Parameter or resource '${logicalId}' could not be found for evaluation`); } } async 'Fn::GetAtt'(logicalId, attributeName) { // ToDo handle the 'logicalId.attributeName' form of Fn::GetAtt const attrValue = await self.findGetAttTarget(logicalId, attributeName); if (attrValue) { return attrValue; } else { throw new CfnEvaluationException(`Attribute '${attributeName}' of resource '${logicalId}' could not be found for evaluation`); } } async 'Fn::Sub'(template, explicitPlaceholders) { const placeholders = explicitPlaceholders ? await self.evaluateCfnExpression(explicitPlaceholders) : {}; return asyncGlobalReplace(template, /\${([^}]*)}/g, key => { if (key in placeholders) { return placeholders[key]; } else { const splitKey = key.split('.'); return splitKey.length === 1 ? this.Ref(key) : this['Fn::GetAtt'](splitKey[0], splitKey.slice(1).join('.')); } }); } async 'Fn::ImportValue'(name) { const exported = await self.lookupExport.lookupExport(name); if (!exported) { throw new CfnEvaluationException(`Export '${name}' could not be found for evaluation`); } if (!exported.Value) { throw new CfnEvaluationException(`Export '${name}' exists without a value`); } return exported.Value; } } if (cfnExpression == null) { return cfnExpression; } if (Array.isArray(cfnExpression)) { return Promise.all(cfnExpression.map(expr => this.evaluateCfnExpression(expr))); } if (typeof cfnExpression === 'object') { const intrinsic = this.parseIntrinsic(cfnExpression); if (intrinsic) { return new CfnIntrinsics().evaluateIntrinsic(intrinsic); } else { const ret = {}; for (const [key, val] of Object.entries(cfnExpression)) { ret[key] = await this.evaluateCfnExpression(val); } return ret; } } return cfnExpression; } references(logicalId, templateElement) { if (typeof templateElement === 'string') { return logicalId === templateElement; } if (templateElement == null) { return false; } if (Array.isArray(templateElement)) { return templateElement.some(el => this.references(logicalId, el)); } if (typeof templateElement === 'object') { return Object.values(templateElement).some(el => this.references(logicalId, el)); } return false; } parseIntrinsic(x) { const keys = Object.keys(x); if (keys.length === 1 && (keys[0].startsWith('Fn::') || keys[0] === 'Ref')) { return { name: keys[0], args: x[keys[0]], }; } return undefined; } async findRefTarget(logicalId) { // first, check to see if the Ref is a Parameter who's value we have if (logicalId === 'AWS::URLSuffix') { if (!this.cachedUrlSuffix) { this.cachedUrlSuffix = this.urlSuffix(this.region); } return this.cachedUrlSuffix; } // Try finding the ref in the passed in parameters const parameterTarget = this.context[logicalId]; if (parameterTarget) { return parameterTarget; } // If not in the passed in parameters, see if there is a default value in the template parameter that was not passed in const defaultParameterValue = this.template.Parameters?.[logicalId]?.Default; if (defaultParameterValue) { return defaultParameterValue; } // if it's not a Parameter, we need to search in the current Stack resources return this.findGetAttTarget(logicalId); } async findGetAttTarget(logicalId, attribute) { // Handle case where the attribute is referencing a stack output (used in nested stacks to share parameters) // See https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/quickref-cloudformation.html#w2ab1c17c23c19b5 if (logicalId === 'Outputs' && attribute) { return this.evaluateCfnExpression(this.template.Outputs[attribute]?.Value); } const stackResources = await this.stackResources.listStackResources(); const foundResource = stackResources.find(sr => sr.LogicalResourceId === logicalId); if (!foundResource) { return undefined; } if (foundResource.ResourceType == 'AWS::CloudFormation::Stack' && attribute?.startsWith('Outputs.')) { // need to resolve attributes from another stack's Output section const dependantStackName = this.findNestedStack(logicalId, this.nestedStackNames); if (!dependantStackName) { //this is a newly created nested stack and cannot be hotswapped return undefined; } const dependantStackTemplate = this.template.Resources[logicalId]; const evaluateCfnTemplate = await this.createNestedEvaluateCloudFormationTemplate(dependantStackName, dependantStackTemplate?.Properties?.NestedTemplate, dependantStackTemplate.newValue?.Properties?.Parameters); // Split Outputs.<refName> into 'Outputs' and '<refName>' and recursively call evaluate return evaluateCfnTemplate.evaluateCfnExpression({ 'Fn::GetAtt': attribute.split(/\.(.*)/s) }); } // now, we need to format the appropriate identifier depending on the resource type, // and the requested attribute name return this.formatResourceAttribute(foundResource, attribute); } findNestedStack(logicalId, nestedStackNames) { for (const [nestedStackLogicalId, { nestedChildStackNames, nestedStackPhysicalName }] of Object.entries(nestedStackNames)) { if (nestedStackLogicalId === logicalId) { return nestedStackPhysicalName; } const checkInNestedChildStacks = this.findNestedStack(logicalId, nestedChildStackNames); if (checkInNestedChildStacks) return checkInNestedChildStacks; } return undefined; } formatResourceAttribute(resource, attribute) { const physicalId = resource.PhysicalResourceId; // no attribute means Ref expression, for which we use the physical ID directly if (!attribute) { return physicalId; } const resourceTypeFormats = RESOURCE_TYPE_ATTRIBUTES_FORMATS[resource.ResourceType]; if (!resourceTypeFormats) { throw new CfnEvaluationException(`We don't support attributes of the '${resource.ResourceType}' resource. This is a CDK limitation. ` + 'Please report it at https://github.com/aws/aws-cdk/issues/new/choose'); } const attributeFmtFunc = resourceTypeFormats[attribute]; if (!attributeFmtFunc) { throw new CfnEvaluationException(`We don't support the '${attribute}' attribute of the '${resource.ResourceType}' resource. This is a CDK limitation. ` + 'Please report it at https://github.com/aws/aws-cdk/issues/new/choose'); } const service = this.getServiceOfResource(resource); const resourceTypeArnPart = this.getResourceTypeArnPartOfResource(resource); return attributeFmtFunc({ partition: this.partition, service, region: this.region, account: this.account, resourceType: resourceTypeArnPart, resourceName: physicalId, }); } getServiceOfResource(resource) { return resource.ResourceType.split('::')[1].toLowerCase(); } getResourceTypeArnPartOfResource(resource) { const resourceType = resource.ResourceType; const specialCaseResourceType = RESOURCE_TYPE_SPECIAL_NAMES[resourceType]?.resourceType; return specialCaseResourceType ? specialCaseResourceType // this is the default case : resourceType.split('::')[2].toLowerCase(); } } exports.EvaluateCloudFormationTemplate = EvaluateCloudFormationTemplate; /** * Usually, we deduce the names of the service and the resource type used to format the ARN from the CloudFormation resource type. * For a CFN type like AWS::Service::ResourceType, the second segment becomes the service name, and the third the resource type * (after converting both of them to lowercase). * However, some resource types break this simple convention, and we need to special-case them. * This map is for storing those cases. */ const RESOURCE_TYPE_SPECIAL_NAMES = { 'AWS::Events::EventBus': { resourceType: 'event-bus', }, }; const RESOURCE_TYPE_ATTRIBUTES_FORMATS = { 'AWS::IAM::Role': { Arn: iamArnFmt }, 'AWS::IAM::User': { Arn: iamArnFmt }, 'AWS::IAM::Group': { Arn: iamArnFmt }, 'AWS::S3::Bucket': { Arn: s3ArnFmt }, 'AWS::Lambda::Function': { Arn: stdColonResourceArnFmt }, 'AWS::Events::EventBus': { Arn: stdSlashResourceArnFmt, // the name attribute of the EventBus is the same as the Ref Name: parts => parts.resourceName, }, 'AWS::DynamoDB::Table': { Arn: stdSlashResourceArnFmt }, 'AWS::AppSync::GraphQLApi': { ApiId: appsyncGraphQlApiApiIdFmt }, 'AWS::AppSync::FunctionConfiguration': { FunctionId: appsyncGraphQlFunctionIDFmt }, 'AWS::AppSync::DataSource': { Name: appsyncGraphQlDataSourceNameFmt }, }; function iamArnFmt(parts) { // we skip region for IAM resources return `arn:${parts.partition}:${parts.service}::${parts.account}:${parts.resourceType}/${parts.resourceName}`; } function s3ArnFmt(parts) { // we skip account, region and resourceType for S3 resources return `arn:${parts.partition}:${parts.service}:::${parts.resourceName}`; } function stdColonResourceArnFmt(parts) { // this is a standard format for ARNs like: arn:aws:service:region:account:resourceType:resourceName return `arn:${parts.partition}:${parts.service}:${parts.region}:${parts.account}:${parts.resourceType}:${parts.resourceName}`; } function stdSlashResourceArnFmt(parts) { // this is a standard format for ARNs like: arn:aws:service:region:account:resourceType/resourceName return `arn:${parts.partition}:${parts.service}:${parts.region}:${parts.account}:${parts.resourceType}/${parts.resourceName}`; } function appsyncGraphQlApiApiIdFmt(parts) { // arn:aws:appsync:us-east-1:111111111111:apis/<apiId> return parts.resourceName.split('/')[1]; } function appsyncGraphQlFunctionIDFmt(parts) { // arn:aws:appsync:us-east-1:111111111111:apis/<apiId>/functions/<functionId> return parts.resourceName.split('/')[3]; } function appsyncGraphQlDataSourceNameFmt(parts) { // arn:aws:appsync:us-east-1:111111111111:apis/<apiId>/datasources/<name> return parts.resourceName.split('/')[3]; } async function asyncGlobalReplace(str, regex, cb) { if (!regex.global) { throw new Error('Regex must be created with /g flag'); } const ret = new Array(); let start = 0; while (true) { const match = regex.exec(str); if (!match) { break; } ret.push(str.substring(start, match.index)); ret.push(await cb(match[1])); start = regex.lastIndex; } ret.push(str.slice(start)); return ret.join(''); } //# 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* as AWS from 'aws-sdk';\nimport { PromiseResult } from 'aws-sdk/lib/request';\nimport { ISDK } from './aws-auth';\nimport { NestedStackNames } from './nested-stack-helpers';\n\nexport interface ListStackResources {\n  listStackResources(): Promise<AWS.CloudFormation.StackResourceSummary[]>;\n}\n\nexport class LazyListStackResources implements ListStackResources {\n  private stackResources: Promise<AWS.CloudFormation.StackResourceSummary[]> | undefined;\n\n  constructor(private readonly sdk: ISDK, private readonly stackName: string) {\n  }\n\n  public async listStackResources(): Promise<AWS.CloudFormation.StackResourceSummary[]> {\n    if (this.stackResources === undefined) {\n      this.stackResources = this.getStackResources(undefined);\n    }\n    return this.stackResources;\n  }\n\n  private async getStackResources(nextToken: string | undefined): Promise<AWS.CloudFormation.StackResourceSummary[]> {\n    const ret = new Array<AWS.CloudFormation.StackResourceSummary>();\n    return this.sdk.cloudFormation().listStackResources({\n      StackName: this.stackName,\n      NextToken: nextToken,\n    }).promise().then(async stackResourcesResponse => {\n      ret.push(...(stackResourcesResponse.StackResourceSummaries ?? []));\n      if (stackResourcesResponse.NextToken) {\n        ret.push(...await this.getStackResources(stackResourcesResponse.NextToken));\n      }\n      return ret;\n    });\n  }\n}\n\nexport interface LookupExport {\n  lookupExport(name: string): Promise<AWS.CloudFormation.Export | undefined>;\n}\n\nexport class LookupExportError extends Error { }\n\nexport class LazyLookupExport implements LookupExport {\n  private cachedExports: { [name: string]: AWS.CloudFormation.Export } = {}\n\n  constructor(private readonly sdk: ISDK) { }\n\n  async lookupExport(name: string): Promise<AWS.CloudFormation.Export | undefined> {\n    if (this.cachedExports[name]) {\n      return this.cachedExports[name];\n    }\n\n    for await (const cfnExport of this.listExports()) {\n      if (!cfnExport.Name) {\n        continue; // ignore any result that omits a name\n      }\n      this.cachedExports[cfnExport.Name] = cfnExport;\n\n      if (cfnExport.Name === name) {\n        return cfnExport;\n      }\n\n    }\n\n    return undefined; // export not found\n  }\n\n  private async * listExports() {\n    let nextToken: string | undefined = undefined;\n    while (true) {\n      const response: PromiseResult<AWS.CloudFormation.ListExportsOutput, AWS.AWSError> = await this.sdk.cloudFormation().listExports({\n        NextToken: nextToken,\n      }).promise();\n\n      for (const cfnExport of response.Exports ?? []) {\n        yield cfnExport;\n      }\n\n      if (!response.NextToken) {\n        return;\n      }\n      nextToken = response.NextToken;\n    }\n  }\n}\n\nexport class CfnEvaluationException extends Error { }\n\nexport interface ResourceDefinition {\n  readonly LogicalId: string;\n  readonly Type: string;\n  readonly Properties: { [p: string]: any };\n}\n\nexport interface EvaluateCloudFormationTemplateProps {\n  readonly stackName: string;\n  readonly template: Template;\n  readonly parameters: { [parameterName: string]: string };\n  readonly account: string;\n  readonly region: string;\n  readonly partition: string;\n  readonly urlSuffix: (region: string) => string;\n  readonly sdk: ISDK;\n  readonly nestedStackNames?: { [nestedStackLogicalId: string]: NestedStackNames };\n}\n\nexport class EvaluateCloudFormationTemplate {\n  private readonly stackName: string;\n  private readonly template: Template;\n  private readonly context: { [k: string]: any };\n  private readonly account: string;\n  private readonly region: string;\n  private readonly partition: string;\n  private readonly urlSuffix: (region: string) => string;\n  private readonly sdk: ISDK;\n  private readonly nestedStackNames: { [nestedStackLogicalId: string]: NestedStackNames };\n  private readonly stackResources: ListStackResources;\n  private readonly lookupExport: LookupExport;\n\n  private cachedUrlSuffix: string | undefined;\n\n  constructor(props: EvaluateCloudFormationTemplateProps) {\n    this.stackName = props.stackName;\n    this.template = props.template;\n    this.context = {\n      'AWS::AccountId': props.account,\n      'AWS::Region': props.region,\n      'AWS::Partition': props.partition,\n      ...props.parameters,\n    };\n    this.account = props.account;\n    this.region = props.region;\n    this.partition = props.partition;\n    this.urlSuffix = props.urlSuffix;\n    this.sdk = props.sdk;\n\n    // We need names of nested stack so we can evaluate cross stack references\n    this.nestedStackNames = props.nestedStackNames ?? {};\n\n    // The current resources of the Stack.\n    // We need them to figure out the physical name of a resource in case it wasn't specified by the user.\n    // We fetch it lazily, to save a service call, in case all hotswapped resources have their physical names set.\n    this.stackResources = new LazyListStackResources(this.sdk, this.stackName);\n\n    // CloudFormation Exports lookup to be able to resolve Fn::ImportValue intrinsics in template\n    this.lookupExport = new LazyLookupExport(this.sdk);\n  }\n\n  // clones current EvaluateCloudFormationTemplate object, but updates the stack name\n  public async createNestedEvaluateCloudFormationTemplate(\n    stackName: string,\n    nestedTemplate: Template,\n    nestedStackParameters: { [parameterName: string]: any },\n  ) {\n    const evaluatedParams = await this.evaluateCfnExpression(nestedStackParameters);\n    return new EvaluateCloudFormationTemplate({\n      stackName,\n      template: nestedTemplate,\n      parameters: evaluatedParams,\n      account: this.account,\n      region: this.region,\n      partition: this.partition,\n      urlSuffix: this.urlSuffix,\n      sdk: this.sdk,\n      nestedStackNames: this.nestedStackNames,\n    });\n  }\n\n  public async establishResourcePhysicalName(logicalId: string, physicalNameInCfnTemplate: any): Promise<string | undefined> {\n    if (physicalNameInCfnTemplate != null) {\n      try {\n        return await this.evaluateCfnExpression(physicalNameInCfnTemplate);\n      } catch (e) {\n        // If we can't evaluate the resource's name CloudFormation expression,\n        // just look it up in the currently deployed Stack\n        if (!(e instanceof CfnEvaluationException)) {\n          throw e;\n        }\n      }\n    }\n    return this.findPhysicalNameFor(logicalId);\n  }\n\n  public async findPhysicalNameFor(logicalId: string): Promise<string | undefined> {\n    const stackResources = await this.stackResources.listStackResources();\n    return stackResources.find(sr => sr.LogicalResourceId === logicalId)?.PhysicalResourceId;\n  }\n\n  public async findLogicalIdForPhysicalName(physicalName: string): Promise<string | undefined> {\n    const stackResources = await this.stackResources.listStackResources();\n    return stackResources.find(sr => sr.PhysicalResourceId === physicalName)?.LogicalResourceId;\n  }\n\n  public findReferencesTo(logicalId: string): Array<ResourceDefinition> {\n    const ret = new Array<ResourceDefinition>();\n    for (const [resourceLogicalId, resourceDef] of Object.entries(this.template?.Resources ?? {})) {\n      if (logicalId !== resourceLogicalId && this.references(logicalId, resourceDef)) {\n        ret.push({\n          ...(resourceDef as any),\n          LogicalId: resourceLogicalId,\n        });\n      }\n    }\n    return ret;\n  }\n\n  public async evaluateCfnExpression(cfnExpression: any): Promise<any> {\n    const self = this;\n    /**\n     * Evaluates CloudFormation intrinsic functions\n     *\n     * Note that supported intrinsic functions are documented in README.md -- please update\n     * list of supported functions when adding new evaluations\n     *\n     * See: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference.html\n     */\n    class CfnIntrinsics {\n      public evaluateIntrinsic(intrinsic: Intrinsic): any {\n        const intrinsicFunc = (this as any)[intrinsic.name];\n        if (!intrinsicFunc) {\n          throw new CfnEvaluationException(`CloudFormation function ${intrinsic.name} is not supported`);\n        }\n\n        const argsAsArray = Array.isArray(intrinsic.args) ? intrinsic.args : [intrinsic.args];\n\n        return intrinsicFunc.apply(this, argsAsArray);\n      }\n\n      async 'Fn::Join'(separator: string, args: any[]): Promise<string> {\n        const evaluatedArgs = await self.evaluateCfnExpression(args);\n        return evaluatedArgs.join(separator);\n      }\n\n      async 'Fn::Split'(separator: string, args: any): Promise<string> {\n        const evaluatedArgs = await self.evaluateCfnExpression