support email mfa

[josefaidt]

Environment information

System:
  OS: macOS 14.7
  CPU: (10) arm64 Apple M1 Pro
  Memory: 72.84 MB / 32.00 GB
  Shell: /opt/homebrew/bin/fish
Binaries:
  Node: 22.8.0 - ~/.local/state/fnm_multishells/43849_1730131892294/bin/node
  Yarn: undefined - undefined
  npm: 10.8.2 - ~/.local/state/fnm_multishells/43849_1730131892294/bin/npm
  pnpm: 9.12.0 - ~/.local/state/fnm_multishells/43849_1730131892294/bin/pnpm
NPM Packages:
  @aws-amplify/auth-construct: Not Found
  @aws-amplify/backend: 1.5.1
  @aws-amplify/backend-auth: Not Found
  @aws-amplify/backend-cli: 1.3.0
  @aws-amplify/backend-data: Not Found
  @aws-amplify/backend-deployer: Not Found
  @aws-amplify/backend-function: Not Found
  @aws-amplify/backend-output-schemas: Not Found
  @aws-amplify/backend-output-storage: Not Found
  @aws-amplify/backend-secret: Not Found
  @aws-amplify/backend-storage: Not Found
  @aws-amplify/cli-core: Not Found
  @aws-amplify/client-config: Not Found
  @aws-amplify/deployed-backend-client: Not Found
  @aws-amplify/form-generator: Not Found
  @aws-amplify/model-generator: Not Found
  @aws-amplify/platform-core: Not Found
  @aws-amplify/plugin-types: Not Found
  @aws-amplify/sandbox: Not Found
  @aws-amplify/schema-generator: Not Found
  aws-amplify: 6.6.7
  aws-cdk: 2.164.1
  aws-cdk-lib: 2.164.1
  typescript: 5.6.3
AWS environment variables:
  AWS_PROFILE = josef
  AWS_REGION = us-east-1
  AWS_STS_REGIONAL_ENDPOINTS = regional
  AWS_NODEJS_CONNECTION_REUSE_ENABLED = 1
  AWS_SDK_LOAD_CONFIG = 1
No CDK environment variables

Describe the feature

Amazon Cognito announced support for email-based multifactor with one-time passwords

// amplify/auth/resource.ts
import { defineAuth } from "@aws-amplify/backend"

export const auth = defineAuth({
  loginWith: {
    email: true,
  },
  multifactor: {
    mode: "REQUIRED",
    email: true,
    // or
    // email: {
    //   subject: "verify yourself",
    //   message: (code) => `here's your code: ${code}`
    // }
  },
})

Use case

n/a