src/lib/auth/pin_code.ts from sinProject-Inc/talk

src/lib/auth/pin_code.ts
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import { App } from '$lib/app/app'
import { randomInt } from 'crypto'

export class PinCode {
    private static readonly _pin_code_chars = '0123456789'

    private readonly _code: string

    public constructor(code: string | undefined) {
        if (!code) throw new Error('PIN code is required')
        // if (code.length < 6) throw new Error('PIN code is too short')
        if (code.length > 50) throw new Error('PIN code is too long')

        this._code = code
    }

    public get code(): string {
        return this._code
    }

    public static generate(length = 6): PinCode {
        let code = ''

        while (code.length < length) {
            code += PinCode._pin_code_chars[randomInt(PinCode._pin_code_chars.length)]
        }

        const pin_code = new PinCode(code)

        return pin_code
    }

    public get_html(): string {
        const html = `
        <html>
            <body>
                <div style="margin-left: auto;margin-right: auto;width: 100%;max-width: 500px;font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, Arial, &quot;Noto Sans&quot;, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color Emoji&quot;;">
                    <h1 style="margin-top: 2.5rem;margin-bottom: 0.5rem;font-size: 2rem;line-height: 2.25rem;font-weight: 800;">${App.company_and_app_name}</h1>
                    <h2 style="margin-top: 2.5rem;margin-bottom: 0.5rem;font-size: 1.875rem;line-height: 2.25rem;font-weight: 600;">Sign in with code</h2>
                    <p style="margin-bottom: 1.25rem;font-size: 1.25rem;line-height: 1.75rem;">Enter the following code into the app to sign in.</p>
                    <p style="width: 100%;background-color: #F3F4F6;padding-top: 30px;padding-bottom: 30px;text-align: center;font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&quot;, monospace;font-size: 1.875rem;line-height: 2.25rem; margin-bottom: 3rem;">
                        ${this._code}
                    </p>
                    <p style="margin-bottom: 1.25rem;font-size: 1.05rem;line-height: 1.75rem;">If you didn’t request this email, you can safely ignore it.</p>
                </div>
            </body>
        </html>`

        return html
    }
}