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import {
CopyObjectCommand,
DeleteObjectCommand,
GetObjectCommand,
ListObjectsV2Command,
NoSuchBucket,
S3Client,
S3ClientConfig,
} from "@aws-sdk/client-s3";
import { toFileNameString } from "@crupest/base";
import { Mail } from "../mail.ts";
async function s3MoveObject(
client: S3Client,
bucket: string,
path: string,
newPath: string,
): Promise<void> {
const copyCommand = new CopyObjectCommand({
Bucket: bucket,
Key: newPath,
CopySource: `${bucket}/${path}`,
});
await client.send(copyCommand);
const deleteCommand = new DeleteObjectCommand({
Bucket: bucket,
Key: path,
});
await client.send(deleteCommand);
}
const AWS_SES_S3_SETUP_TAG = "AMAZON_SES_SETUP_NOTIFICATION";
export type AwsS3MailConsumer = (
rawMail: string,
s3Key: string,
) => Promise<void>;
export class AwsMailFetcher {
readonly #livePrefix = "mail/live/";
readonly #archivePrefix = "mail/archive/";
readonly #s3;
readonly #bucket;
constructor(aws: S3ClientConfig, bucket: string) {
this.#s3 = new S3Client(aws);
this.#bucket = bucket;
}
async listLiveMails(): Promise<string[]> {
const listCommand = new ListObjectsV2Command({
Bucket: this.#bucket,
Prefix: this.#livePrefix,
});
const res = await this.#s3.send(listCommand);
if (res.Contents == null) {
console.warn("S3 API returned null Content.");
return [];
}
const result: string[] = [];
for (const object of res.Contents) {
if (object.Key == null) {
console.warn("S3 API returned null Key.");
continue;
}
if (object.Key.endsWith(AWS_SES_S3_SETUP_TAG)) continue;
result.push(object.Key.slice(this.#livePrefix.length));
}
return result;
}
async consumeS3Mail(
logTag: string,
s3Key: string,
consumer: AwsS3MailConsumer,
) {
console.info(logTag, `Fetching s3 mail ${s3Key}...`);
const mailPath = `${this.#livePrefix}${s3Key}`;
const command = new GetObjectCommand({
Bucket: this.#bucket,
Key: mailPath,
});
let rawMail;
try {
const res = await this.#s3.send(command);
if (res.Body == null) {
throw new Error("S3 API returns a null body.");
}
rawMail = await res.Body.transformToString();
} catch (cause) {
if (cause instanceof NoSuchBucket) {
console.error(`S3 mail key ${s3Key} not found. Perhaps already consumed?`)
return;
}
throw cause;
}
console.info(logTag, `Calling consumer...`);
await consumer(rawMail, s3Key);
const { date } = new Mail(rawMail).parsed;
const dateString = date != null
? toFileNameString(date, true)
: "invalid-date";
const newPath = `${this.#archivePrefix}${dateString}/${s3Key}`;
console.info(logTag, `Archiving s3 mail ${s3Key} to ${newPath}...`);
await s3MoveObject(this.#s3, this.#bucket, mailPath, newPath);
console.info(logTag, `Done consuming s3 mail ${s3Key}.`);
}
async recycleLiveMails(consumer: AwsS3MailConsumer) {
console.info("Begin to recycle live mails...");
const mails = await this.listLiveMails();
console.info(`Found ${mails.length} live mails`);
let counter = 1;
for (const s3Key of mails) {
await this.consumeS3Mail(
`[${counter++}/${mails.length}]`,
s3Key,
consumer,
);
}
}
}
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