@aws-cdk/aws-apigateway
Version:
The CDK Construct Library for AWS::ApiGateway
159 lines • 24.5 kB
JavaScript
"use strict";
var _a, _b;
Object.defineProperty(exports, "__esModule", { value: true });
exports.RequestAuthorizer = exports.TokenAuthorizer = void 0;
const jsiiDeprecationWarnings = require("../../.warnings.jsii.js");
const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
const iam = require("@aws-cdk/aws-iam");
const core_1 = require("@aws-cdk/core");
const apigateway_generated_1 = require("../apigateway.generated");
const authorizer_1 = require("../authorizer");
class LambdaAuthorizer extends authorizer_1.Authorizer {
constructor(scope, id, props) {
super(scope, id);
this.handler = props.handler;
this.role = props.assumeRole;
if (props.resultsCacheTtl && props.resultsCacheTtl?.toSeconds() > 3600) {
throw new Error('Lambda authorizer property \'resultsCacheTtl\' must not be greater than 3600 seconds (1 hour)');
}
}
/**
* Attaches this authorizer to a specific REST API.
* @internal
*/
_attachToApi(restApi) {
if (this.restApiId && this.restApiId !== restApi.restApiId) {
throw new Error('Cannot attach authorizer to two different rest APIs');
}
this.restApiId = restApi.restApiId;
}
/**
* Sets up the permissions necessary for the API Gateway service to invoke the Lambda function.
*/
setupPermissions() {
if (!this.role) {
this.handler.addPermission(`${core_1.Names.uniqueId(this)}:Permissions`, {
principal: new iam.ServicePrincipal('apigateway.amazonaws.com'),
sourceArn: this.authorizerArn,
});
}
else if (this.role instanceof iam.Role) { // i.e. not imported
this.role.attachInlinePolicy(new iam.Policy(this, 'authorizerInvokePolicy', {
statements: [
new iam.PolicyStatement({
resources: this.handler.resourceArnsForGrantInvoke,
actions: ['lambda:InvokeFunction'],
}),
],
}));
}
}
/**
* Returns a token that resolves to the Rest Api Id at the time of synthesis.
* Throws an error, during token resolution, if no RestApi is attached to this authorizer.
*/
lazyRestApiId() {
return core_1.Lazy.string({
produce: () => {
if (!this.restApiId) {
throw new Error(`Authorizer (${this.node.path}) must be attached to a RestApi`);
}
return this.restApiId;
},
});
}
}
/**
* Token based lambda authorizer that recognizes the caller's identity as a bearer token,
* such as a JSON Web Token (JWT) or an OAuth token.
* Based on the token, authorization is performed by a lambda function.
*
* @resource AWS::ApiGateway::Authorizer
*/
class TokenAuthorizer extends LambdaAuthorizer {
constructor(scope, id, props) {
super(scope, id, props);
try {
jsiiDeprecationWarnings._aws_cdk_aws_apigateway_TokenAuthorizerProps(props);
}
catch (error) {
if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
Error.captureStackTrace(error, TokenAuthorizer);
}
throw error;
}
const restApiId = this.lazyRestApiId();
const resource = new apigateway_generated_1.CfnAuthorizer(this, 'Resource', {
name: props.authorizerName ?? core_1.Names.uniqueId(this),
restApiId,
type: 'TOKEN',
authorizerUri: lambdaAuthorizerArn(props.handler),
authorizerCredentials: props.assumeRole?.roleArn,
authorizerResultTtlInSeconds: props.resultsCacheTtl?.toSeconds(),
identitySource: props.identitySource || 'method.request.header.Authorization',
identityValidationExpression: props.validationRegex,
});
this.authorizerId = resource.ref;
this.authorizerArn = core_1.Stack.of(this).formatArn({
service: 'execute-api',
resource: restApiId,
resourceName: `authorizers/${this.authorizerId}`,
});
this.setupPermissions();
}
}
exports.TokenAuthorizer = TokenAuthorizer;
_a = JSII_RTTI_SYMBOL_1;
TokenAuthorizer[_a] = { fqn: "@aws-cdk/aws-apigateway.TokenAuthorizer", version: "1.204.0" };
/**
* Request-based lambda authorizer that recognizes the caller's identity via request parameters,
* such as headers, paths, query strings, stage variables, or context variables.
* Based on the request, authorization is performed by a lambda function.
*
* @resource AWS::ApiGateway::Authorizer
*/
class RequestAuthorizer extends LambdaAuthorizer {
constructor(scope, id, props) {
super(scope, id, props);
try {
jsiiDeprecationWarnings._aws_cdk_aws_apigateway_RequestAuthorizerProps(props);
}
catch (error) {
if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
Error.captureStackTrace(error, RequestAuthorizer);
}
throw error;
}
if ((props.resultsCacheTtl === undefined || props.resultsCacheTtl.toSeconds() !== 0) && props.identitySources.length === 0) {
throw new Error('At least one Identity Source is required for a REQUEST-based Lambda authorizer if caching is enabled.');
}
const restApiId = this.lazyRestApiId();
const resource = new apigateway_generated_1.CfnAuthorizer(this, 'Resource', {
name: props.authorizerName ?? core_1.Names.uniqueId(this),
restApiId,
type: 'REQUEST',
authorizerUri: lambdaAuthorizerArn(props.handler),
authorizerCredentials: props.assumeRole?.roleArn,
authorizerResultTtlInSeconds: props.resultsCacheTtl?.toSeconds(),
identitySource: props.identitySources.map(is => is.toString()).join(','),
});
this.authorizerId = resource.ref;
this.authorizerArn = core_1.Stack.of(this).formatArn({
service: 'execute-api',
resource: restApiId,
resourceName: `authorizers/${this.authorizerId}`,
});
this.setupPermissions();
}
}
exports.RequestAuthorizer = RequestAuthorizer;
_b = JSII_RTTI_SYMBOL_1;
RequestAuthorizer[_b] = { fqn: "@aws-cdk/aws-apigateway.RequestAuthorizer", version: "1.204.0" };
/**
* constructs the authorizerURIArn.
*/
function lambdaAuthorizerArn(handler) {
const { region, partition } = core_1.Arn.split(handler.functionArn, core_1.ArnFormat.COLON_RESOURCE_NAME);
return `arn:${partition}:apigateway:${region}:lambda:path/2015-03-31/functions/${handler.functionArn}/invocations`;
}
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Note that, this is not the primary identifier of the authorizer.\n   *\n   * @default - the unique construcrt ID\n   */\n  readonly authorizerName?: string;\n\n  /**\n   * The handler for the authorizer lambda function.\n   *\n   * The handler must follow a very specific protocol on the input it receives and the output it needs to produce.\n   * API Gateway has documented the handler's input specification\n   * {@link https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-lambda-authorizer-input.html | here} and output specification\n   * {@link https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-lambda-authorizer-output.html | here}.\n   */\n  readonly handler: lambda.IFunction;\n\n  /**\n   * How long APIGateway should cache the results. Max 1 hour.\n   * Disable caching by setting this to 0.\n   *\n   * @default Duration.minutes(5)\n   */\n  readonly resultsCacheTtl?: Duration;\n\n  /**\n   * An optional IAM role for APIGateway to assume before calling the Lambda-based authorizer. The IAM role must be\n   * assumable by 'apigateway.amazonaws.com'.\n   *\n   * @default - A resource policy is added to the Lambda function allowing apigateway.amazonaws.com to invoke the function.\n   */\n  readonly assumeRole?: iam.IRole;\n}\n\nabstract class LambdaAuthorizer extends Authorizer implements IAuthorizer {\n\n  /**\n   * The id of the authorizer.\n   * @attribute\n   */\n  public abstract readonly authorizerId: string;\n\n  /**\n   * The ARN of the authorizer to be used in permission policies, such as IAM and resource-based grants.\n   */\n  public abstract readonly authorizerArn: string;\n\n  /**\n   * The Lambda function handler that this authorizer uses.\n   */\n  protected readonly handler: lambda.IFunction;\n\n  /**\n   * The IAM role that the API Gateway service assumes while invoking the Lambda function.\n   */\n  protected readonly role?: iam.IRole;\n\n  protected restApiId?: string;\n\n  protected constructor(scope: Construct, id: string, props: LambdaAuthorizerProps) {\n    super(scope, id);\n\n    this.handler = props.handler;\n    this.role = props.assumeRole;\n\n    if (props.resultsCacheTtl && props.resultsCacheTtl?.toSeconds() > 3600) {\n      throw new Error('Lambda authorizer property \\'resultsCacheTtl\\' must not be greater than 3600 seconds (1 hour)');\n    }\n  }\n\n  /**\n   * Attaches this authorizer to a specific REST API.\n   * @internal\n   */\n  public _attachToApi(restApi: IRestApi) {\n    if (this.restApiId && this.restApiId !== restApi.restApiId) {\n      throw new Error('Cannot attach authorizer to two different rest APIs');\n    }\n\n    this.restApiId = restApi.restApiId;\n  }\n\n  /**\n   * Sets up the permissions necessary for the API Gateway service to invoke the Lambda function.\n   */\n  protected setupPermissions() {\n    if (!this.role) {\n      this.handler.addPermission(`${Names.uniqueId(this)}:Permissions`, {\n        principal: new iam.ServicePrincipal('apigateway.amazonaws.com'),\n        sourceArn: this.authorizerArn,\n      });\n    } else if (this.role instanceof iam.Role) { // i.e. not imported\n      this.role.attachInlinePolicy(new iam.Policy(this, 'authorizerInvokePolicy', {\n        statements: [\n          new iam.PolicyStatement({\n            resources: this.handler.resourceArnsForGrantInvoke,\n            actions: ['lambda:InvokeFunction'],\n          }),\n        ],\n      }));\n    }\n  }\n\n  /**\n   * Returns a token that resolves to the Rest Api Id at the time of synthesis.\n   * Throws an error, during token resolution, if no RestApi is attached to this authorizer.\n   */\n  protected lazyRestApiId() {\n    return Lazy.string({\n      produce: () => {\n        if (!this.restApiId) {\n          throw new Error(`Authorizer (${this.node.path}) must be attached to a RestApi`);\n        }\n        return this.restApiId;\n      },\n    });\n  }\n}\n\n/**\n * Properties for TokenAuthorizer\n */\nexport interface TokenAuthorizerProps extends LambdaAuthorizerProps {\n  /**\n   * An optional regex to be matched against the authorization token. When matched the authorizer lambda is invoked,\n   * otherwise a 401 Unauthorized is returned to the client.\n   *\n   * @default - no regex filter will be applied.\n   */\n  readonly validationRegex?: string;\n\n  /**\n   * The request header mapping expression for the bearer token. This is typically passed as part of the header, in which case\n   * this should be `method.request.header.Authorizer` where Authorizer is the header containing the bearer token.\n   * @see https://docs.aws.amazon.com/apigateway/api-reference/link-relation/authorizer-create/#identitySource\n   * @default `IdentitySource.header('Authorization')`\n   */\n  readonly identitySource?: string;\n}\n\n/**\n * Token based lambda authorizer that recognizes the caller's identity as a bearer token,\n * such as a JSON Web Token (JWT) or an OAuth token.\n * Based on the token, authorization is performed by a lambda function.\n *\n * @resource AWS::ApiGateway::Authorizer\n */\nexport class TokenAuthorizer extends LambdaAuthorizer {\n\n  public readonly authorizerId: string;\n\n  public readonly authorizerArn: string;\n\n  constructor(scope: Construct, id: string, props: TokenAuthorizerProps) {\n    super(scope, id, props);\n\n    const restApiId = this.lazyRestApiId();\n    const resource = new CfnAuthorizer(this, 'Resource', {\n      name: props.authorizerName ?? Names.uniqueId(this),\n      restApiId,\n      type: 'TOKEN',\n      authorizerUri: lambdaAuthorizerArn(props.handler),\n      authorizerCredentials: props.assumeRole?.roleArn,\n      authorizerResultTtlInSeconds: props.resultsCacheTtl?.toSeconds(),\n      identitySource: props.identitySource || 'method.request.header.Authorization',\n      identityValidationExpression: props.validationRegex,\n    });\n\n    this.authorizerId = resource.ref;\n    this.authorizerArn = Stack.of(this).formatArn({\n      service: 'execute-api',\n      resource: restApiId,\n      resourceName: `authorizers/${this.authorizerId}`,\n    });\n\n    this.setupPermissions();\n  }\n}\n\n/**\n * Properties for RequestAuthorizer\n */\nexport interface RequestAuthorizerProps extends LambdaAuthorizerProps {\n  /**\n   * An array of request header mapping expressions for identities. Supported parameter types are\n   * Header, Query String, Stage Variable, and Context. For instance, extracting an authorization\n   * token from a header would use the identity source `IdentitySource.header('Authorizer')`.\n   *\n   * Note: API Gateway uses the specified identity sources as the request authorizer caching key. When caching is\n   * enabled, API Gateway calls the authorizer's Lambda function only after successfully verifying that all the\n   * specified identity sources are present at runtime. If a specified identify source is missing, null, or empty,\n   * API Gateway returns a 401 Unauthorized response without calling the authorizer Lambda function.\n   *\n   * @see https://docs.aws.amazon.com/apigateway/api-reference/link-relation/authorizer-create/#identitySource\n   */\n  readonly identitySources: string[];\n}\n\n/**\n * Request-based lambda authorizer that recognizes the caller's identity via request parameters,\n * such as headers, paths, query strings, stage variables, or context variables.\n * Based on the request, authorization is performed by a lambda function.\n *\n * @resource AWS::ApiGateway::Authorizer\n */\nexport class RequestAuthorizer extends LambdaAuthorizer {\n\n  public readonly authorizerId: string;\n\n  public readonly authorizerArn: string;\n\n  constructor(scope: Construct, id: string, props: RequestAuthorizerProps) {\n    super(scope, id, props);\n\n    if ((props.resultsCacheTtl === undefined || props.resultsCacheTtl.toSeconds() !== 0) && props.identitySources.length === 0) {\n      throw new Error('At least one Identity Source is required for a REQUEST-based Lambda authorizer if caching is enabled.');\n    }\n\n    const restApiId = this.lazyRestApiId();\n    const resource = new CfnAuthorizer(this, 'Resource', {\n      name: props.authorizerName ?? Names.uniqueId(this),\n      restApiId,\n      type: 'REQUEST',\n      authorizerUri: lambdaAuthorizerArn(props.handler),\n      authorizerCredentials: props.assumeRole?.roleArn,\n      authorizerResultTtlInSeconds: props.resultsCacheTtl?.toSeconds(),\n      identitySource: props.identitySources.map(is => is.toString()).join(','),\n    });\n\n    this.authorizerId = resource.ref;\n    this.authorizerArn = Stack.of(this).formatArn({\n      service: 'execute-api',\n      resource: restApiId,\n      resourceName: `authorizers/${this.authorizerId}`,\n    });\n\n    this.setupPermissions();\n  }\n}\n\n/**\n * constructs the authorizerURIArn.\n */\nfunction lambdaAuthorizerArn(handler: lambda.IFunction) {\n  const { region, partition } = Arn.split( handler.functionArn, ArnFormat.COLON_RESOURCE_NAME);\n  return `arn:${partition}:apigateway:${region}:lambda:path/2015-03-31/functions/${handler.functionArn}/invocations`;\n}\n"]}