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/// <reference types="npm:@types/node" />
import {
GetObjectCommand,
ListObjectsV2Command,
S3Client,
} from "@aws-sdk/client-s3";
import log from "../log.ts";
import config from "../config.ts";
import "../better-js.ts";
import { Mail, MailDeliverer } from "../mail.ts";
import { AwsContext, s3MoveObject } from "./context.ts";
const AWS_SES_S3_SETUP_TAG = "AMAZON_SES_SETUP_NOTIFICATION";
export class AwsMailRetriever {
readonly liveMailPrefix = "mail/live/";
readonly archiveMailPrefix = "mail/archive/";
readonly mailBucket = config.get("awsMailBucket");
readonly #s3;
constructor(
aws: AwsContext,
public readonly inboundDeliverer: MailDeliverer,
) {
this.#s3 = new S3Client(aws);
}
async listLiveMails(): Promise<string[]> {
log.info("Begin to retrieve live mails.");
const listCommand = new ListObjectsV2Command({
Bucket: this.mailBucket,
Prefix: this.liveMailPrefix,
});
const res = await this.#s3.send(listCommand);
if (res.Contents == null) {
log.warn("Listing live mails in S3 returns null Content.");
return [];
}
const result: string[] = [];
for (const object of res.Contents) {
if (object.Key == null) {
log.warn("Listing live mails in S3 returns an object with no Key.");
continue;
}
if (object.Key.endsWith(AWS_SES_S3_SETUP_TAG)) continue;
result.push(object.Key.slice(this.liveMailPrefix.length));
}
return result;
}
async deliverS3Mail(s3Key: string, recipients: string[] = []) {
log.info(`Begin to deliver s3 mail ${s3Key} to ${recipients.join(" ")}...`);
log.info(`Fetching s3 mail ${s3Key}...`);
const mailPath = `${this.liveMailPrefix}${s3Key}`;
const command = new GetObjectCommand({
Bucket: this.mailBucket,
Key: mailPath,
});
const res = await this.#s3.send(command);
if (res.Body == null) {
throw new Error("S3 mail returns a null body.");
}
const rawMail = await res.Body.transformToString();
log.info(`Done fetching s3 mail ${s3Key}.`);
log.info(`Delivering s3 mail ${s3Key}...`);
const mail = new Mail(rawMail);
await this.inboundDeliverer.deliver({ mail, recipients: recipients });
log.info(`Done delivering s3 mail ${s3Key}.`);
const date = mail.startSimpleParse().sections().headers().date();
const dateString = date?.toFileNameString(true) ?? "invalid-date";
const newPath = `${this.archiveMailPrefix}${dateString}/${s3Key}`;
log.info(`Archiving s3 mail ${s3Key} to ${newPath}...`);
await s3MoveObject(this.#s3, this.mailBucket, mailPath, newPath);
log.info(`Done delivering s3 mail ${s3Key}...`);
}
async recycleLiveMails() {
log.info("Begin to recycle live mails...");
const mails = await this.listLiveMails();
log.info(`Found ${mails.length} live mails`);
for (const s3Key of mails) {
await this.deliverS3Mail(s3Key);
}
}
}
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