mailer/src/contact.ts

import accounts from '../config/account.json' with { type: 'json' }
import dkim from '../config/dkim.json' with { type: 'json' }

export type AddressString = `${string}@${string}.${string}`

export class Contact {
	#name: string
	#address: AddressString

	constructor(
		{ name, address }: {
			name: string
			address: AddressString
		},
	) {
		this.#name = name
		this.#address = address
	}

	static expand(shortName: string): Contact {
		if (!(shortName in accounts)) {
			throw new Error('unknown short name contact')
		}

		const { name, address } = accounts[shortName as keyof typeof accounts]

		if (typeof name !== 'string') {
			throw new SyntaxError(
				`missing key "name" in contact short name config for "${shortName}"`,
			)
		}
		if (typeof address !== 'string') {
			throw new SyntaxError(
				`missing key "address" in contact short name config for "${shortName}"`,
			)
		}

		const addressRegExp = new RegExp(String.raw`\w+@(\w+\.)?${dkim.domainName}`)
		if (!(addressRegExp.test(address))) {
			throw new SyntaxError(
				`invalid "address" in contact short name config for "${shortName}"`,
			)
		}

		//@ts-ignore checked against regex
		return new Contact({ name, address })
	}

	static fromString(raw: string): Contact {
		const [_, name, address] =
			raw.match(/(.*)<(\S+@\S+\.\S+)>/)?.map((match) => match.trim()) ?? []

		if (typeof address !== 'string') {
			throw new Error('address is empty')
		}

		//@ts-ignore checked against regex
		return new Contact({ name, address })
	}

	toString(): string {
		return `${this.#name} <${this.#address}>`
	}

	toJSON(): { name: string; address: AddressString } {
		return {
			name: this.#name,
			address: this.#address,
		} as const
	}

	get name(): string {
		return this.#name
	}

	get address(): AddressString {
		return this.#address
	}
}