send-mail/main.js

const nodemailer = require("nodemailer")
const core = require("@actions/core")
const fs = require("fs")

function get_body(body) {
    if (body.startsWith("file://")) {
        body = body.replace("file://", "")
        body = fs.readFileSync(body, "utf8")
    }

    return body
}

async function main() {
    try {
        server_address = core.getInput("server_address", { required: true })
        server_port = core.getInput("server_port", { required: true })
        username = core.getInput("username", { required: true })
        password = core.getInput("password", { required: true })
        subject = core.getInput("subject", { required: true })
        body = core.getInput("body", { required: true })
        to = core.getInput("to", { required: true })
        from = core.getInput("from", { required: true })
        html = core.getInput("html") || "false"

        transport = nodemailer.createTransport({
            host: server_address,
            port: server_port,
            secure: server_port == "465",
            auth: {
                user: username,
                pass: password,
            }
        })

        info = await transport.sendMail({
            from: `"${from}" <${username}>`,
            to: to,
            subject: subject,
            text: html == "false" ? get_body(body) : undefined,
            html: html == "true" ? get_body(body) : undefined,
        })

        core.info(info)
    } catch (error) {
        core.setFailed(error.message)
    }
}

main()