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import { encodeBase64 } from "@std/encoding/base64";
import { getLogger } from "./logger.ts";
import { generateTimeStringForFileName } from "./util.ts";
export type MailDeliverStateNotSent = { kind: "not-sent" };
export type MailDeliverStateDelivered = {
kind: "delivered";
deliverer: MailDeliverer;
error?: Error;
};
export type MailDeliverStateError = {
kind: "error";
deliverer: MailDeliverer;
error: Error;
};
export type MailDeliverState =
| MailDeliverStateNotSent
| MailDeliverStateDelivered
| MailDeliverStateError;
class MailParseError extends Error {
constructor(
message: string,
public readonly mail: Mail,
public readonly lineNumber?: number,
options?: ErrorOptions,
) {
if (lineNumber != null) message += `(at line ${lineNumber})`;
super(message, options);
}
}
class MailDeliverError extends Error {
constructor(
message: string,
public readonly mail: Mail,
options?: ErrorOptions,
) {
super(message, options);
}
}
const eolNames = new Map([
["\n", "\\n"],
["\r", "\\r"],
["\n\r", "\\n\\r"],
]);
interface ParsedMail {
sections: {
header: string;
body: string;
};
/**
* The empty line between headers and body.
*/
sep: string;
eol: string;
}
export class Mail {
messageId: string | null = null;
awsMessageId: string | null = null;
deliverState: MailDeliverState = { kind: "not-sent" };
constructor(public raw: string) {}
setDelivered(deliverer: MailDeliverer, error?: Error) {
this.deliverState = { "kind": "delivered", deliverer, error };
}
throwDeliverError(
deliverer: MailDeliverer,
reason: string,
cause?: unknown,
): never {
const error = new MailDeliverError(
`Failed to deliver mail to ${deliverer.destination}: ${reason}`,
this,
{ cause },
);
this.deliverState = { "kind": "error", deliverer, error };
throw error;
}
toUtf8Bytes(): Uint8Array {
const utf8Encoder = new TextEncoder();
return utf8Encoder.encode(this.raw);
}
toBase64(): string {
return encodeBase64(this.raw);
}
simpleParse(): ParsedMail {
const twoEolMatch = this.raw.match(/(\r\n|\n|\r)(\r\n|\n|\r)/);
// "\r\n" is a false positive.
if (twoEolMatch == null || twoEolMatch[0] === "\r\n") {
throw new MailParseError(
"No header/body section separator (2 successive EOLs) found.",
this,
);
}
const [eol, sep] = [twoEolMatch[1], twoEolMatch[2]];
if (eol !== sep) {
getLogger().warn(
`Different EOLs (${eolNames.get(eol)} and ${eolNames.get(sep)}) found.`,
);
}
return {
sections: {
header: this.raw.slice(0, twoEolMatch.index! + eol.length),
body: this.raw.slice(twoEolMatch.index! + eol.length + sep.length),
},
sep,
eol,
};
}
simpleParseHeaders(): [key: string, value: string][] {
const { sections } = this.simpleParse();
const headers: [string, string][] = [];
let field: string | null = null;
let lineNumber = 1;
const handleField = () => {
if (field == null) return;
const sepPos = field.indexOf(":");
if (sepPos === -1) {
throw new MailParseError(
"No ':' in the header field.",
this,
lineNumber,
);
}
headers.push([field.slice(0, sepPos).trim(), field.slice(sepPos + 1)]);
field = null;
};
for (const line of sections.header.trimEnd().split(/\r?\n|\r/)) {
if (line.match(/^\s/)) {
if (field == null) {
throw new MailParseError(
"Header field starts with a space.",
this,
lineNumber,
);
}
field += line;
} else {
handleField();
field = line;
}
lineNumber += 1;
}
handleField();
return headers;
}
/**
* Find the Date header and parse it to date.
* @param invalidToNull Whether to convert invalid date to null. Default is false.
* @returns Parsed date (may be an invalid date if `invalidToNull` us false).
* `null` if the date header is missing or parsing fails and `invalidToNull`
* is true.
*/
simpleGetDate<T = null>(invalidValue: T | null = null): Date | T | null {
const headers = this.simpleParseHeaders();
for (const [key, value] of headers) {
if (key.toLowerCase() === "date") {
const date = new Date(value);
if (isNaN(date.getTime())) {
getLogger().warn(`Invalid date string (${value}) found in header.`);
return invalidValue;
}
return date;
}
}
return null;
}
simpleGetDateString<T>(fallback: T): string | T {
const date = this.simpleGetDate();
if (date == null) return fallback;
return generateTimeStringForFileName(date, true);
}
// TODO: Add folding.
appendHeaders(headers: [key: string, value: string][]) {
const { sections, sep, eol } = this.simpleParse();
this.raw = sections.header +
headers.map(([k, v]) => `${k}: ${v}`).join(eol) + eol + sep +
sections.body;
}
}
type MailDeliverHook = (mail: Mail) => Promise<void>;
export abstract class MailDeliverer {
preHooks: MailDeliverHook[] = [];
postHooks: MailDeliverHook[] = [];
constructor(public readonly destination: string) {}
protected doPrepare(_mail: Mail): Promise<void> {
return Promise.resolve();
}
protected abstract doDeliver(mail: Mail): Promise<void>;
protected doFinalize(_mail: Mail): Promise<void> {
return Promise.resolve();
}
async deliverRaw(raw: string): Promise<void> {
const mail = new Mail(raw);
await this.deliver(mail);
}
async deliver(mail: Mail): Promise<void> {
this.doPrepare(mail);
for (const hook of this.preHooks) {
await hook(mail);
}
await this.doDeliver(mail);
if (mail.deliverState.kind === "not-sent") {
mail.setDelivered(this);
}
for (const hook of this.postHooks) {
await hook(mail);
}
await this.doFinalize(mail);
}
}
|
