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import { Transport, TransportOptions, createTransport } from "nodemailer"
import * as JSONTransport from "nodemailer/lib/json-transport/index.js"
import * as SendmailTransport from "nodemailer/lib/sendmail-transport/index.js"
import * as SESTransport from "nodemailer/lib/ses-transport/index.js"
import * as SMTPPool from "nodemailer/lib/smtp-pool/index.js"
import * as SMTPTransport from "nodemailer/lib/smtp-transport/index.js"
import * as StreamTransport from "nodemailer/lib/stream-transport/index.js"
import type { Awaitable } from ".."
import type { CommonProviderOptions } from "."
import type { Theme } from "../core/types"
// TODO: Make use of https://www.typescriptlang.org/docs/handbook/2/template-literal-types.html for the string
type AllTransportOptions =
| string
| SMTPTransport
| SMTPTransport.Options
| SMTPPool
| SMTPPool.Options
| SendmailTransport
| SendmailTransport.Options
| StreamTransport
| StreamTransport.Options
| JSONTransport
| JSONTransport.Options
| SESTransport
| SESTransport.Options
| Transport<any>
| TransportOptions
export interface SendVerificationRequestParams {
identifier: string
url: string
expires: Date
provider: EmailConfig
token: string
theme: Theme
}
export interface EmailUserConfig {
server?: AllTransportOptions
type?: "email"
/** @default "NextAuth <no-reply@example.com>" */
from?: string
/**
* How long until the e-mail can be used to log the user in,
* in seconds. Defaults to 1 day
* @default 86400
*/
maxAge?: number
/** [Documentation](https://next-auth.js.org/providers/email#customizing-emails) */
sendVerificationRequest?: (
params: SendVerificationRequestParams
) => Awaitable<void>
/**
* By default, we are generating a random verification token.
* You can make it predictable or modify it as you like with this method.
* @example
* ```js
* Providers.Email({
* async generateVerificationToken() {
* return "ABC123"
* }
* })
* ```
* [Documentation](https://next-auth.js.org/providers/email#customizing-the-verification-token)
*/
generateVerificationToken?: () => Awaitable<string>
/** If defined, it is used to hash the verification token when saving to the database . */
secret?: string
/**
* Normalizes the user input before sending the verification request.
*
* ⚠️ Always make sure this method returns a single email address.
*
* @note Technically, the part of the email address local mailbox element
* (everything before the `@` symbol) should be treated as 'case sensitive'
* according to RFC 2821, but in practice this causes more problems than
* it solves, e.g.: when looking up users by e-mail from databases.
* By default, we treat email addresses as all lower case,
* but you can override this function to change this behavior.
*
* [Documentation](https://next-auth.js.org/providers/email#normalizing-the-e-mail-address) | [RFC 2821](https://tools.ietf.org/html/rfc2821) | [Email syntax](https://en.wikipedia.org/wiki/Email_address#Syntax)
*/
normalizeIdentifier?: (identifier: string) => string
}
export interface EmailConfig extends CommonProviderOptions {
// defaults
id: "email"
type: "email"
name: "Email"
server: AllTransportOptions
from: string
maxAge: number
sendVerificationRequest: (
params: SendVerificationRequestParams
) => Awaitable<void>
/**
* This is copied into EmailConfig in parseProviders() don't use elsewhere
*/
options: EmailUserConfig
// user options
// TODO figure out a better way than copying from EmailUserConfig
secret?: string
generateVerificationToken?: () => Awaitable<string>
normalizeIdentifier?: (identifier: string) => string
}
export type EmailProvider = (options: EmailUserConfig) => EmailConfig
// TODO: Rename to Token provider
// when started working on https://github.com/nextauthjs/next-auth/discussions/1465
export type EmailProviderType = "Email"
export default function Email(options: EmailUserConfig): EmailConfig {
return {
id: "email",
type: "email",
name: "Email",
// Server can be an SMTP connection string or a nodemailer config object
server: { host: "localhost", port: 25, auth: { user: "", pass: "" } },
from: "NextAuth <no-reply@example.com>",
maxAge: 24 * 60 * 60,
async sendVerificationRequest(params) {
const { identifier, url, provider, theme } = params
const { host } = new URL(url)
const transport = createTransport(provider.server)
const result = await transport.sendMail({
to: identifier,
from: provider.from,
subject: `Sign in to ${host}`,
text: text({ url, host }),
html: html({ url, host, theme }),
})
const failed = result.rejected.concat(result.pending).filter(Boolean)
if (failed.length) {
throw new Error(`Email (${failed.join(", ")}) could not be sent`)
}
},
options,
}
}
/**
* Email HTML body
* Insert invisible space into domains from being turned into a hyperlink by email
* clients like Outlook and Apple mail, as this is confusing because it seems
* like they are supposed to click on it to sign in.
*
* @note We don't add the email address to avoid needing to escape it, if you do, remember to sanitize it!
*/
function html(params: { url: string; host: string; theme: Theme }) {
const { url, host, theme } = params
const escapedHost = host.replace(/\./g, "​.")
// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
const brandColor = theme.brandColor || "#346df1"
// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
const buttonText = theme.buttonText || "#fff"
const color = {
background: "#f9f9f9",
text: "#444",
mainBackground: "#fff",
buttonBackground: brandColor,
buttonBorder: brandColor,
buttonText,
}
return `
<body style="background: ${color.background};">
<table width="100%" border="0" cellspacing="20" cellpadding="0"
style="background: ${color.mainBackground}; max-width: 600px; margin: auto; border-radius: 10px;">
<tr>
<td align="center"
style="padding: 10px 0px; font-size: 22px; font-family: Helvetica, Arial, sans-serif; color: ${color.text};">
Sign in to <strong>${escapedHost}</strong>
</td>
</tr>
<tr>
<td align="center" style="padding: 20px 0;">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center" style="border-radius: 5px;" bgcolor="${color.buttonBackground}"><a href="${url}"
target="_blank"
style="font-size: 18px; font-family: Helvetica, Arial, sans-serif; color: ${color.buttonText}; text-decoration: none; border-radius: 5px; padding: 10px 20px; border: 1px solid ${color.buttonBorder}; display: inline-block; font-weight: bold;">Sign
in</a></td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="center"
style="padding: 0px 0px 10px 0px; font-size: 16px; line-height: 22px; font-family: Helvetica, Arial, sans-serif; color: ${color.text};">
If you did not request this email you can safely ignore it.
</td>
</tr>
</table>
</body>
`
}
/** Email Text body (fallback for email clients that don't render HTML, e.g. feature phones) */
function text({ url, host }: { url: string; host: string }) {
return `Sign in to ${host}\n${url}\n\n`
}