fix(credential-providers): support custom middleware for sts client

clients/client-sts/jest.config.js

@@ -0,0 +1,5 @@
+const base = require("../../jest.config.base.js");
+
+module.exports = {
+  ...base,
+};

clients/client-sts/package.json

@@ -9,7 +9,9 @@
     "build:es": "tsc -p tsconfig.es.json",
     "build:types": "tsc -p tsconfig.types.json",
     "build:types:downlevel": "downlevel-dts dist-types dist-types/ts3.4",
-    "clean": "rimraf ./dist-* && rimraf *.tsbuildinfo"
+    "clean": "rimraf ./dist-* && rimraf *.tsbuildinfo",
+    "test": "yarn test:unit",
+    "test:unit": "jest"
   },
   "main": "./dist-cjs/index.js",
   "types": "./dist-types/index.d.ts",

clients/client-sts/src/defaultRoleAssumers.ts

@@ -1,28 +1,49 @@
 // smithy-typescript generated code
 // Please do not touch this file. It's generated from template in:
 // https://github.com/aws/aws-sdk-js-v3/blob/main/codegen/smithy-aws-typescript-codegen/src/main/resources/software/amazon/smithy/aws/typescript/codegen/sts-client-defaultRoleAssumers.ts
+import { Pluggable } from "@aws-sdk/types";
+
 import {
   DefaultCredentialProvider,
   getDefaultRoleAssumer as StsGetDefaultRoleAssumer,
   getDefaultRoleAssumerWithWebIdentity as StsGetDefaultRoleAssumerWithWebIdentity,
   RoleAssumer,
   RoleAssumerWithWebIdentity,
 } from "./defaultStsRoleAssumers";
-import { STSClient, STSClientConfig } from "./STSClient";
+import { ServiceInputTypes, ServiceOutputTypes, STSClient, STSClientConfig } from "./STSClient";
+
+const getCustomizableStsClientCtor = (
+  baseCtor: new (config: STSClientConfig) => STSClient,
+  customizations?: Pluggable<ServiceInputTypes, ServiceOutputTypes>[]
+) => {
+  if (!customizations) return baseCtor;
+  else
+    return class CustomizableSTSClient extends baseCtor {
+      constructor(config: STSClientConfig) {
+        super(config);
+        for (const customization of customizations!) {
+          this.middlewareStack.use(customization);
+        }
+      }
+    };
+};
 
 /**
  * The default role assumer that used by credential providers when sts:AssumeRole API is needed.
  */
 export const getDefaultRoleAssumer = (
-  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {}
-): RoleAssumer => StsGetDefaultRoleAssumer(stsOptions, STSClient);
+  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {},
+  stsPlugins?: Pluggable<ServiceInputTypes, ServiceOutputTypes>[]
+): RoleAssumer => StsGetDefaultRoleAssumer(stsOptions, getCustomizableStsClientCtor(STSClient, stsPlugins));
 
 /**
  * The default role assumer that used by credential providers when sts:AssumeRoleWithWebIdentity API is needed.
  */
 export const getDefaultRoleAssumerWithWebIdentity = (
-  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {}
-): RoleAssumerWithWebIdentity => StsGetDefaultRoleAssumerWithWebIdentity(stsOptions, STSClient);
+  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {},
+  stsPlugins?: Pluggable<ServiceInputTypes, ServiceOutputTypes>[]
+): RoleAssumerWithWebIdentity =>
+  StsGetDefaultRoleAssumerWithWebIdentity(stsOptions, getCustomizableStsClientCtor(STSClient, stsPlugins));
 
 /**
  * The default credential providers depend STS client to assume role with desired API: sts:assumeRole,

clients/client-sts/test/defaultRoleAssumers.spec.ts

@@ -1,8 +1,13 @@
 // Please do not touch this file. It's generated from template in:
 // https://github.com/aws/aws-sdk-js-v3/blob/main/codegen/smithy-aws-typescript-codegen/src/main/resources/software/amazon/smithy/aws/typescript/codegen/sts-client-defaultRoleAssumers.spec.ts
+import { NodeHttpHandler, streamCollector } from "@aws-sdk/node-http-handler";
 import { HttpResponse } from "@aws-sdk/protocol-http";
 import { Readable } from "stream";
 
+import type { AssumeRoleCommandInput } from "../src/commands/AssumeRoleCommand";
+import { AssumeRoleWithWebIdentityCommandInput } from "../src/commands/AssumeRoleWithWebIdentityCommand";
+import { getDefaultRoleAssumer, getDefaultRoleAssumerWithWebIdentity } from "../src/defaultRoleAssumers";
+
 const mockHandle = jest.fn().mockResolvedValue({
   response: new HttpResponse({
     statusCode: 200,
@@ -17,11 +22,6 @@ jest.mock("@aws-sdk/node-http-handler", () => ({
   streamCollector: jest.fn(),
 }));
 
-import { NodeHttpHandler, streamCollector } from "@aws-sdk/node-http-handler";
-
-import type { AssumeRoleCommandInput } from "../src/commands/AssumeRoleCommand";
-import { AssumeRoleWithWebIdentityCommandInput } from "../src/commands/AssumeRoleWithWebIdentityCommand";
-import { getDefaultRoleAssumer, getDefaultRoleAssumerWithWebIdentity } from "../src/defaultRoleAssumers";
 const mockConstructorInput = jest.fn();
 jest.mock("../src/STSClient", () => ({
   STSClient: function (params: any) {
@@ -102,6 +102,29 @@ describe("getDefaultRoleAssumer", () => {
       region,
     });
   });
+
+  it("should use the STS client middleware", async () => {
+    const customMiddlewareFunction = jest.fn();
+    const roleAssumer = getDefaultRoleAssumer({}, [
+      {
+        applyToStack: (stack) => {
+          stack.add((next) => (args) => {
+            customMiddlewareFunction(args);
+            return next(args);
+          });
+        },
+      },
+    ]);
+    const params: AssumeRoleCommandInput = {
+      RoleArn: "arn:aws:foo",
+      RoleSessionName: "session",
+    };
+    const sourceCred = { accessKeyId: "key", secretAccessKey: "secrete" };
+    await Promise.all([roleAssumer(sourceCred, params), roleAssumer(sourceCred, params)]);
+    expect(customMiddlewareFunction).toHaveBeenCalledTimes(2); // make sure the middleware is not added to stack multiple times.
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(1, expect.objectContaining({ input: params }));
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(2, expect.objectContaining({ input: params }));
+  });
 });
 
 describe("getDefaultRoleAssumerWithWebIdentity", () => {
@@ -146,4 +169,27 @@ describe("getDefaultRoleAssumerWithWebIdentity", () => {
       region,
     });
   });
+
+  it("should use the STS client middleware", async () => {
+    const customMiddlewareFunction = jest.fn();
+    const roleAssumerWithWebIdentity = getDefaultRoleAssumerWithWebIdentity({}, [
+      {
+        applyToStack: (stack) => {
+          stack.add((next) => (args) => {
+            customMiddlewareFunction(args);
+            return next(args);
+          });
+        },
+      },
+    ]);
+    const params: AssumeRoleWithWebIdentityCommandInput = {
+      RoleArn: "arn:aws:foo",
+      RoleSessionName: "session",
+      WebIdentityToken: "token",
+    };
+    await Promise.all([roleAssumerWithWebIdentity(params), roleAssumerWithWebIdentity(params)]);
+    expect(customMiddlewareFunction).toHaveBeenCalledTimes(2); // make sure the middleware is not added to stack multiple times.
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(1, expect.objectContaining({ input: params }));
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(2, expect.objectContaining({ input: params }));
+  });
 });

codegen/smithy-aws-typescript-codegen/src/main/resources/software/amazon/smithy/aws/typescript/codegen/sts-client-defaultRoleAssumers.spec.ts

@@ -1,6 +1,11 @@
+import { NodeHttpHandler, streamCollector } from "@aws-sdk/node-http-handler";
 import { HttpResponse } from "@aws-sdk/protocol-http";
 import { Readable } from "stream";
 
+import type { AssumeRoleCommandInput } from "../src/commands/AssumeRoleCommand";
+import { AssumeRoleWithWebIdentityCommandInput } from "../src/commands/AssumeRoleWithWebIdentityCommand";
+import { getDefaultRoleAssumer, getDefaultRoleAssumerWithWebIdentity } from "../src/defaultRoleAssumers";
+
 const mockHandle = jest.fn().mockResolvedValue({
   response: new HttpResponse({
     statusCode: 200,
@@ -15,11 +20,6 @@ jest.mock("@aws-sdk/node-http-handler", () => ({
   streamCollector: jest.fn(),
 }));
 
-import { NodeHttpHandler, streamCollector } from "@aws-sdk/node-http-handler";
-
-import type { AssumeRoleCommandInput } from "../src/commands/AssumeRoleCommand";
-import { AssumeRoleWithWebIdentityCommandInput } from "../src/commands/AssumeRoleWithWebIdentityCommand";
-import { getDefaultRoleAssumer, getDefaultRoleAssumerWithWebIdentity } from "../src/defaultRoleAssumers";
 const mockConstructorInput = jest.fn();
 jest.mock("../src/STSClient", () => ({
   STSClient: function (params: any) {
@@ -100,6 +100,29 @@ describe("getDefaultRoleAssumer", () => {
       region,
     });
   });
+
+  it("should use the STS client middleware", async () => {
+    const customMiddlewareFunction = jest.fn();
+    const roleAssumer = getDefaultRoleAssumer({}, [
+      {
+        applyToStack: (stack) => {
+          stack.add((next) => (args) => {
+            customMiddlewareFunction(args);
+            return next(args);
+          });
+        },
+      },
+    ]);
+    const params: AssumeRoleCommandInput = {
+      RoleArn: "arn:aws:foo",
+      RoleSessionName: "session",
+    };
+    const sourceCred = { accessKeyId: "key", secretAccessKey: "secrete" };
+    await Promise.all([roleAssumer(sourceCred, params), roleAssumer(sourceCred, params)]);
+    expect(customMiddlewareFunction).toHaveBeenCalledTimes(2); // make sure the middleware is not added to stack multiple times.
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(1, expect.objectContaining({ input: params }));
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(2, expect.objectContaining({ input: params }));
+  });
 });
 
 describe("getDefaultRoleAssumerWithWebIdentity", () => {
@@ -144,4 +167,27 @@ describe("getDefaultRoleAssumerWithWebIdentity", () => {
       region,
     });
   });
+
+  it("should use the STS client middleware", async () => {
+    const customMiddlewareFunction = jest.fn();
+    const roleAssumerWithWebIdentity = getDefaultRoleAssumerWithWebIdentity({}, [
+      {
+        applyToStack: (stack) => {
+          stack.add((next) => (args) => {
+            customMiddlewareFunction(args);
+            return next(args);
+          });
+        },
+      },
+    ]);
+    const params: AssumeRoleWithWebIdentityCommandInput = {
+      RoleArn: "arn:aws:foo",
+      RoleSessionName: "session",
+      WebIdentityToken: "token",
+    };
+    await Promise.all([roleAssumerWithWebIdentity(params), roleAssumerWithWebIdentity(params)]);
+    expect(customMiddlewareFunction).toHaveBeenCalledTimes(2); // make sure the middleware is not added to stack multiple times.
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(1, expect.objectContaining({ input: params }));
+    expect(customMiddlewareFunction).toHaveBeenNthCalledWith(2, expect.objectContaining({ input: params }));
+  });
 });

codegen/smithy-aws-typescript-codegen/src/main/resources/software/amazon/smithy/aws/typescript/codegen/sts-client-defaultRoleAssumers.ts

@@ -1,25 +1,46 @@
+import { Pluggable } from "@aws-sdk/types";
+
 import {
   DefaultCredentialProvider,
   getDefaultRoleAssumer as StsGetDefaultRoleAssumer,
   getDefaultRoleAssumerWithWebIdentity as StsGetDefaultRoleAssumerWithWebIdentity,
   RoleAssumer,
   RoleAssumerWithWebIdentity,
 } from "./defaultStsRoleAssumers";
-import { STSClient, STSClientConfig } from "./STSClient";
+import { ServiceInputTypes, ServiceOutputTypes, STSClient, STSClientConfig } from "./STSClient";
+
+const getCustomizableStsClientCtor = (
+  baseCtor: new (config: STSClientConfig) => STSClient,
+  customizations?: Pluggable<ServiceInputTypes, ServiceOutputTypes>[]
+) => {
+  if (!customizations) return baseCtor;
+  else
+    return class CustomizableSTSClient extends baseCtor {
+      constructor(config: STSClientConfig) {
+        super(config);
+        for (const customization of customizations!) {
+          this.middlewareStack.use(customization);
+        }
+      }
+    };
+};
 
 /**
  * The default role assumer that used by credential providers when sts:AssumeRole API is needed.
  */
 export const getDefaultRoleAssumer = (
-  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {}
-): RoleAssumer => StsGetDefaultRoleAssumer(stsOptions, STSClient);
+  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {},
+  stsPlugins?: Pluggable<ServiceInputTypes, ServiceOutputTypes>[]
+): RoleAssumer => StsGetDefaultRoleAssumer(stsOptions, getCustomizableStsClientCtor(STSClient, stsPlugins));
 
 /**
  * The default role assumer that used by credential providers when sts:AssumeRoleWithWebIdentity API is needed.
  */
 export const getDefaultRoleAssumerWithWebIdentity = (
-  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {}
-): RoleAssumerWithWebIdentity => StsGetDefaultRoleAssumerWithWebIdentity(stsOptions, STSClient);
+  stsOptions: Pick<STSClientConfig, "logger" | "region" | "requestHandler"> = {},
+  stsPlugins?: Pluggable<ServiceInputTypes, ServiceOutputTypes>[]
+): RoleAssumerWithWebIdentity =>
+  StsGetDefaultRoleAssumerWithWebIdentity(stsOptions, getCustomizableStsClientCtor(STSClient, stsPlugins));
 
 /**
  * The default credential providers depend STS client to assume role with desired API: sts:assumeRole,

packages/credential-providers/README.md

@@ -650,6 +650,35 @@ const credentialProvider = fromNodeProviderChain({
 });
 ```
 
+## Add Custom Headers to STS assume-role calls
+
+You can specify the plugins--groups of middleware, to inject to the STS client.
+For example, you can inject custom headers to each STS assume-role calls. It's
+available in [`fromTemporaryCredentials()`](#fromtemporarycredentials),
+[`fromWebToken()`](#fromwebtoken), [`fromTokenFile()`](#fromtokenfile), [`fromIni()`](#fromini).
+
+Code example:
+
+```javascript
+const addConfusedDeputyMiddleware = (next) => (args) => {
+  args.request.headers["x-amz-source-account"] = account;
+  args.request.headers["x-amz-source-arn"] = sourceArn;
+  return next(args);
+};
+const confusedDeputyPlugin = {
+  applyToStack: (stack) => {
+    stack.add(addConfusedDeputyMiddleware, { step: "finalizeRequest" });
+  },
+};
+const provider = fromTemporaryCredentials({
+  // Required. Options passed to STS AssumeRole operation.
+  params: {
+    RoleArn: "arn:aws:iam::1234567890:role/Role",
+  },
+  clientPlugins: [confusedDeputyPlugin],
+});
+```
+
 [getcredentialsforidentity_api]: https://docs.aws.amazon.com/cognitoidentity/latest/APIReference/API_GetCredentialsForIdentity.html
 [getid_api]: https://docs.aws.amazon.com/cognitoidentity/latest/APIReference/API_GetId.html
 [assumerole_api]: https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html

packages/credential-providers/src/fromIni.spec.ts

@@ -46,13 +46,14 @@ describe("fromIni", () => {
     expect(getDefaultRoleAssumerWithWebIdentity).not.toBeCalled();
   });
 
-  it("should use supplied sts options", () => {
+  it("should use supplied sts and plugins options", () => {
     const profile = "profile";
     const clientConfig = {
       region: "US_BAR_1",
     };
-    fromIni({ profile, clientConfig });
-    expect(getDefaultRoleAssumer).toBeCalledWith(clientConfig);
-    expect(getDefaultRoleAssumerWithWebIdentity).toBeCalledWith(clientConfig);
+    const plugin = { applyToStack: () => {} };
+    fromIni({ profile, clientConfig, clientPlugins: [plugin] });
+    expect(getDefaultRoleAssumer).toBeCalledWith(clientConfig, [plugin]);
+    expect(getDefaultRoleAssumerWithWebIdentity).toBeCalledWith(clientConfig, [plugin]);
   });
 });

packages/credential-providers/src/fromIni.ts

@@ -1,9 +1,10 @@
 import { getDefaultRoleAssumer, getDefaultRoleAssumerWithWebIdentity, STSClientConfig } from "@aws-sdk/client-sts";
 import { fromIni as _fromIni, FromIniInit as _FromIniInit } from "@aws-sdk/credential-provider-ini";
-import { CredentialProvider } from "@aws-sdk/types";
+import { CredentialProvider, Pluggable } from "@aws-sdk/types";
 
 export interface FromIniInit extends _FromIniInit {
   clientConfig?: STSClientConfig;
+  clientPlugins?: Pluggable<any, any>[];
 }
 
 /**
@@ -38,14 +39,17 @@ export interface FromIniInit extends _FromIniInit {
  *     },
  *     // Optional. Custom STS client configurations overriding the default ones.
  *     clientConfig: { region },
+ *     // Optional. Custom STS client middleware plugin to modify the client default behavior.
+ *     // e.g. adding custom headers.
+ *     clientPlugins: [addFooHeadersPlugin],
  *   }),
  * });
  * ```
  */
 export const fromIni = (init: FromIniInit = {}): CredentialProvider =>
   _fromIni({
     ...init,
-    roleAssumer: init.roleAssumer ?? getDefaultRoleAssumer(init.clientConfig),
+    roleAssumer: init.roleAssumer ?? getDefaultRoleAssumer(init.clientConfig, init.clientPlugins),
     roleAssumerWithWebIdentity:
-      init.roleAssumerWithWebIdentity ?? getDefaultRoleAssumerWithWebIdentity(init.clientConfig),
+      init.roleAssumerWithWebIdentity ?? getDefaultRoleAssumerWithWebIdentity(init.clientConfig, init.clientPlugins),
   });

packages/credential-providers/src/fromNodeProviderChain.spec.ts

@@ -46,13 +46,14 @@ describe(fromNodeProviderChain.name, () => {
     expect(getDefaultRoleAssumerWithWebIdentity).not.toBeCalled();
   });
 
-  it("should use supplied sts options", () => {
+  it("should use supplied sts options and plugins", () => {
     const profile = "profile";
     const clientConfig = {
       region: "US_BAR_1",
     };
-    fromNodeProviderChain({ profile, clientConfig });
-    expect(getDefaultRoleAssumer).toBeCalledWith(clientConfig);
-    expect(getDefaultRoleAssumerWithWebIdentity).toBeCalledWith(clientConfig);
+    const plugin = { applyToStack: () => {} };
+    fromNodeProviderChain({ profile, clientConfig, clientPlugins: [plugin] });
+    expect(getDefaultRoleAssumer).toBeCalledWith(clientConfig, [plugin]);
+    expect(getDefaultRoleAssumerWithWebIdentity).toBeCalledWith(clientConfig, [plugin]);
   });
 });