Change email content

To change the content of the default email templates, you can override the getContent function in the emailDelivery object. It allows you to return an object that has the following properties:

body: This is the email's body. This can be HTML or just text as well.
isHtml: If the body is HTML, then this should be true.
subject: This is the subject of the email to send.
toEmail: The email will be sent to this email.

Other information like which email ID to send from is specified in the smtpSettings object.

NodeJS
GoLang
Python

import supertokens from "supertokens-node";
import Passwordless from "supertokens-node/recipe/passwordless";
import Session from "supertokens-node/recipe/session";
import { SMTPService } from "supertokens-node/recipe/passwordless/emaildelivery";

supertokens.init({
    appInfo: {
        apiDomain: "...",
        appName: "...",
        websiteDomain: "..."
    },
    recipeList: [
        Passwordless.init({
            emailDelivery: {
                service: new SMTPService({
                    smtpSettings: { /*...*/ },
                    override: (originalImplementation) => {
                        return {
                            ...originalImplementation,
                            getContent: async function ({
                                codeLifetime, // amount of time the code is alive for (in MS)
                                email,
                                urlWithLinkCode, // magic link
                                userInputCode, // OTP
                            }) {
                                // send some custom email content
                                return {
                                    body: "EMAIL BODY",
                                    isHtml: true,
                                    subject: "Some subject",
                                    toEmail: email
                                }

                                // You can even call the original implementation and
                                // modify its content:
                                
                                /*
                                let originalContent = await originalImplementation.getContent(input)
                                originalContent.subject = "My custom subject";
                                return originalContent;
                                */
                            }
                        }
                    }
                })
            }
        }),
        Session.init()
    ]
});

import (
    "fmt"

    "github.com/supertokens/supertokens-golang/ingredients/emaildelivery"
    "github.com/supertokens/supertokens-golang/recipe/passwordless"
    "github.com/supertokens/supertokens-golang/recipe/passwordless/plessmodels"
    "github.com/supertokens/supertokens-golang/supertokens"
)

func main() {

    supertokens.Init(supertokens.TypeInput{
        RecipeList: []supertokens.Recipe{
            passwordless.Init(plessmodels.TypeInput{
                EmailDelivery: &emaildelivery.TypeInput{
                    Service: passwordless.MakeSMTPService(emaildelivery.SMTPServiceConfig{
                        Settings: emaildelivery.SMTPSettings{ /* ... */ },

                        Override: func(originalImplementation emaildelivery.SMTPInterface) emaildelivery.SMTPInterface {

                            // originalGetContent := *originalImplementation.GetContent

                            (*originalImplementation.GetContent) = func(input emaildelivery.EmailType, userContext supertokens.UserContext) (emaildelivery.EmailContent, error) {
                                // amount of time the code is alive for (in MS)
                                codeLifetime := input.PasswordlessLogin.CodeLifetime
                                email := input.PasswordlessLogin.Email

                                // magic link
                                urlWithLinkCode := input.PasswordlessLogin.UrlWithLinkCode

                                // OTP
                                userInputCode := input.PasswordlessLogin.UserInputCode
                                fmt.Println(codeLifetime)
                                fmt.Println(email)
                                fmt.Println(urlWithLinkCode)
                                fmt.Println(userInputCode)

                                // send some custom email content
                                return emaildelivery.EmailContent{
                                    Body:    "EMAIL BODY",
                                    IsHtml:  true,
                                    Subject: "Some subject",
                                    ToEmail: email,
                                }, nil

                                // you can even call the original implementation and modify that

                                /*
                                       originalContent, err := originalGetContent(input, userContext)
                                       if err != nil {
                                           return emaildelivery.EmailContent{}, err
                                       }
                                       originalContent.Subject = "My custom subject"
                                       return originalContent, nil
                                */

                            }

                            return originalImplementation
                        },

                    }),
                },
            }),
        },
    })
}

from supertokens_python import init, InputAppInfo
from supertokens_python.recipe import passwordless
from supertokens_python.ingredients.emaildelivery.types import EmailDeliveryConfig, SMTPSettings, EmailContent
from supertokens_python.recipe.passwordless.types import SMTPOverrideInput, EmailTemplateVars
from typing import Dict, Any


def custom_smtp_content_override(original_implementation: SMTPOverrideInput) -> SMTPOverrideInput:

    # original_get_content = original_implementation.get_content

    async def get_content(template_vars: EmailTemplateVars, user_context: Dict[str, Any]) -> EmailContent:
        # amount of time the code is alive for (in MS)
        _ = template_vars.code_life_time
        email = template_vars.email
        __ = template_vars.url_with_link_code  # magic link
        ___ = template_vars.user_input_code  # OTP

        # send some custom email content
        return EmailContent(body="EMAIL BODY", subject="Some subject", is_html=True, to_email=email)

        # you can even call the original implementation and modify that

        # original_content = await original_get_content(template_vars, user_context)
        # original_content.subject = "My custom subject"
        # return original_content

    original_implementation.get_content = get_content
    return original_implementation


init(
    app_info=InputAppInfo(
        api_domain="...", app_name="...", website_domain="..."),
    framework='...',  
    recipe_list=[
        passwordless.init(
            email_delivery=EmailDeliveryConfig(
                service=passwordless.SMTPService(
                    smtp_settings=SMTPSettings(...),  
                    override=custom_smtp_content_override
                )
            )
        )
    ]
)