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import { encodeBase64 } from "@std/encoding/base64";
import { parse } from "@std/csv/parse";
import { simpleParseMail } from "./mail-parsing.ts";
export class Mail {
#raw;
#parsed;
constructor(raw: string) {
this.#raw = raw;
this.#parsed = simpleParseMail(raw);
}
get raw() {
return this.#raw;
}
set raw(value) {
this.#raw = value;
this.#parsed = simpleParseMail(value);
}
get parsed() {
return this.#parsed;
}
toUtf8Bytes(): Uint8Array {
const utf8Encoder = new TextEncoder();
return utf8Encoder.encode(this.raw);
}
toBase64(): string {
return encodeBase64(this.raw);
}
simpleFindAllAddresses(): string[] {
const re = /,?\<?([a-z0-9_'+\-\.]+\@[a-z0-9_'+\-\.]+)\>?,?/gi;
return [...this.raw.matchAll(re)].map((m) => m[1]);
}
}
export interface MailDeliverRecipientResult {
kind: "success" | "failure";
message?: string;
cause?: unknown;
}
export class MailDeliverResult {
message?: string;
smtpMessage?: string;
recipients = new Map<string, MailDeliverRecipientResult>();
constructor(public mail: Mail) {}
get hasFailure() {
return this.recipients.values().some((v) => v.kind !== "success");
}
generateLogMessage(prefix: string) {
const lines = [];
if (this.message != null) lines.push(`${prefix} message: ${this.message}`);
if (this.smtpMessage != null) {
lines.push(`${prefix} smtpMessage: ${this.smtpMessage}`);
}
for (const [name, result] of this.recipients.entries()) {
const { kind, message, cause } = result;
lines.push(`${prefix} (${name}): ${kind} ${message} ${cause}`);
}
return lines.join("\n");
}
}
export class MailDeliverContext {
readonly recipients: Set<string> = new Set();
readonly result;
constructor(public logTag: string, public mail: Mail) {
this.result = new MailDeliverResult(this.mail);
}
}
export interface MailDeliverHook {
callback(context: MailDeliverContext): Promise<void>;
}
export abstract class MailDeliverer {
#counter = 1;
#last?: Promise<void>;
abstract name: string;
preHooks: MailDeliverHook[] = [];
postHooks: MailDeliverHook[] = [];
constructor(public sync: boolean) {}
protected abstract doDeliver(
mail: Mail,
context: MailDeliverContext,
): Promise<void>;
async deliverRaw(rawMail: string) {
return await this.deliver({ mail: new Mail(rawMail) });
}
async #deliverCore(context: MailDeliverContext) {
for (const hook of this.preHooks) {
await hook.callback(context);
}
await this.doDeliver(context.mail, context);
for (const hook of this.postHooks) {
await hook.callback(context);
}
}
async deliver(options: {
mail: Mail;
recipients?: string[];
logTag?: string;
}): Promise<MailDeliverResult> {
const logTag = options.logTag ?? `[${this.name} ${this.#counter}]`;
this.#counter++;
if (this.#last != null) {
console.info(logTag, "Wait for last delivering done...");
await this.#last;
}
const context = new MailDeliverContext(
logTag,
options.mail,
);
options.recipients?.forEach((r) => context.recipients.add(r));
console.info(context.logTag, "Begin to deliver mail...");
const deliverPromise = this.#deliverCore(context);
if (this.sync) {
this.#last = deliverPromise.then(() => {}, () => {});
}
await deliverPromise;
this.#last = undefined;
console.info(context.logTag, "Deliver result:");
console.info(context.result.generateLogMessage(context.logTag));
if (context.result.hasFailure) {
throw new Error("Failed to deliver to some recipients.");
}
return context.result;
}
}
export class RecipientFromHeadersHook implements MailDeliverHook {
constructor(public mailDomain: string) {}
callback(context: MailDeliverContext) {
if (context.recipients.size !== 0) {
console.warn(
context.logTag,
"Recipients are already filled, skip inferring from headers.",
);
} else {
[...context.mail.parsed.recipients].filter((r) =>
r.endsWith("@" + this.mailDomain)
).forEach((r) => context.recipients.add(r));
console.info(
context.logTag,
"Use recipients inferred from mail headers:",
[...context.recipients].join(", "),
);
}
return Promise.resolve();
}
}
export class FallbackRecipientHook implements MailDeliverHook {
constructor(public fallback: Set<string> = new Set()) {}
callback(context: MailDeliverContext) {
if (context.recipients.size === 0) {
console.info(
context.logTag,
"Use fallback recipients:" + [...this.fallback].join(", "),
);
this.fallback.forEach((a) => context.recipients.add(a));
}
return Promise.resolve();
}
}
export class AliasRecipientMailHook implements MailDeliverHook {
#aliasFile;
constructor(aliasFile: string) {
this.#aliasFile = aliasFile;
}
async #parseAliasFile(logTag: string): Promise<Map<string, string>> {
const result = new Map();
if ((await Deno.stat(this.#aliasFile)).isFile) {
const text = await Deno.readTextFile(this.#aliasFile);
const csv = parse(text);
for (const [real, ...aliases] of csv) {
aliases.forEach((a) => result.set(a, real));
}
} else {
console.warn(
logTag,
`Recipient alias file ${this.#aliasFile} is not found.`,
);
}
return result;
}
async callback(context: MailDeliverContext) {
const aliases = await this.#parseAliasFile(context.logTag);
for (const recipient of [...context.recipients]) {
const realRecipients = aliases.get(recipient);
if (realRecipients != null) {
console.info(
context.logTag,
`Recipient alias resolved: ${recipient} => ${realRecipients}.`,
);
context.recipients.delete(recipient);
context.recipients.add(realRecipients);
}
}
}
}
|
