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import { parseArgs } from "@std/cli";
import { decodeBase64 } from "@std/encoding/base64";
import { z } from "zod";
import { zValidator } from "@hono/zod-validator";
import { error, log } from "../logger.ts";
import { AppBase } from "../app.ts";
import { AwsContext } from "./context.ts";
import { AwsMailDeliverer } from "./deliver.ts";
import { AwsMailRetriever } from "./retriever.ts";
import config from "../config.ts";
const AWS_SNS_MESSAGE_MODEL = z.object({
Type: z.enum(["Notification", "SubscriptionConfirmation"]),
TopicArn: z.string(),
Timestamp: z.string(),
Subject: z.string().optional(),
SubscribeURL: z.string().optional(),
Message: z.string(),
MessageId: z.string(),
Signature: z.string(),
SigningCertURL: z.string(),
SignatureVersion: z.string(),
});
type AwsSnsMessage = z.TypeOf<typeof AWS_SNS_MESSAGE_MODEL>;
const AWS_SES_SNS_MESSAGE_MODEL = z.object({
notificationType: z.literal("Received").or(z.string()),
receipt: z.object({
recipients: z.array(z.string()),
}),
mail: z.object({
messageId: z.string(),
}),
});
const AWS_SNS_SIGNATURE_FIELDS = {
Notification: [
"Message",
"MessageId",
"Subject",
"Timestamp",
"TopicArn",
"Type",
],
SubscriptionConfirmation: [
"Message",
"MessageId",
"SubscribeURL",
"Timestamp",
"TopicArn",
"Type",
],
} as const;
async function verifySnsSignature(message: AwsSnsMessage) {
const signingCertUrl = message.SigningCertURL;
if (!new URL(signingCertUrl).hostname.endsWith(".amazonaws.com")) {
throw new Error(
`Signature cert url ${signingCertUrl} does not belong to aws!!!`,
);
}
const signature = message.Signature;
const data = AWS_SNS_SIGNATURE_FIELDS[message.Type].filter((field) =>
field in message
).flatMap((field) => [field, message[field]]).join("\n");
const certData = await (await fetch(signingCertUrl)).bytes();
const key = await crypto.subtle.importKey(
"pkcs8",
certData,
{
name: "RSA-PSS",
hash: message.SignatureVersion === "1" ? "SHA-1" : "SHA-256",
},
false,
["verify"],
);
const isVerified = await crypto.subtle.verify(
{
name: "RSA-PSS",
hash: message.SignatureVersion === "1" ? "SHA-1" : "SHA-256",
},
key,
decodeBase64(signature),
new TextEncoder().encode(data),
);
if (!isVerified) {
throw new Error("Signature does not match!!!");
}
}
export class AwsRelayApp extends AppBase {
readonly #aws = new AwsContext();
readonly #retriever;
protected readonly outboundDeliverer = new AwsMailDeliverer(this.#aws);
constructor() {
super();
this.#retriever = new AwsMailRetriever(this.#aws, this.inboundDeliverer);
this.hono.post(
"/receive/s3",
zValidator(
"json",
z.object({
key: z.string(),
}),
),
async (ctx) => {
await this.#retriever.deliverS3Mail(
ctx.req.valid("json").key,
);
return ctx.json({
"msg": "Done!",
});
},
);
this.hono.post(
`/receive/aws-sns/${config.getValue("awsInboundPath")}`,
zValidator("json", AWS_SNS_MESSAGE_MODEL),
async (ctx) => {
const message = ctx.req.valid("json");
await verifySnsSignature(message);
if (message.Type === "Notification") {
const sesMessage = JSON.parse(message.Message);
const parsedSesMessage = AWS_SES_SNS_MESSAGE_MODEL.parse(sesMessage);
// TODO: Here!!! Specify receipts!
await this.#retriever.deliverS3Mail(parsedSesMessage.mail.messageId);
return ctx.json({
"msg": "Done!",
});
} else if (message.Type === "SubscriptionConfirmation") {
} else {
}
},
);
}
realServe() {
this.createCron({
name: "live-mail-recycler",
interval: 6 * 3600 * 1000,
callback: () => {
return this.#retriever.recycleLiveMails();
},
startNow: true,
});
return this.serve();
}
readonly cli = {
"init": (_: unknown) => {
log("Just init!");
return Promise.resolve();
},
"list-lives": async (_: unknown) => {
const liveMails = await this.#retriever.listLiveMails();
log(`Total ${liveMails.length}:`);
log(liveMails.join("\n"));
},
"recycle-lives": async (_: unknown) => {
await this.#retriever.recycleLiveMails();
},
"serve": async (_: unknown) => {
await this.serve().http.finished;
},
"real-serve": async (_: unknown) => {
await this.realServe().http.finished;
},
} as const;
}
const nonServerCli = {
"sendmail": async (_: unknown) => {
const decoder = new TextDecoder();
let text = "";
for await (const chunk of Deno.stdin.readable) {
text += decoder.decode(chunk);
}
const res = await fetch(
`http://localhost:${config.HTTP_PORT}/send/raw`,
{
method: "post",
body: text,
},
);
const logger = res.ok ? log : error;
logger(res);
logger("Body\n" + await res.text());
if (!res.ok) Deno.exit(-1);
},
} as const;
if (import.meta.main) {
const args = parseArgs(Deno.args);
if (args._.length === 0) {
throw new Error("You must specify a command.");
}
const command = args._[0];
if (command in nonServerCli) {
log(`Run non-server command ${command}.`);
await nonServerCli[command as keyof typeof nonServerCli](args);
Deno.exit(0);
}
const app = new AwsRelayApp();
if (command in app.cli) {
log(`Run command ${command}.`);
await app.cli[command as keyof AwsRelayApp["cli"]](args);
Deno.exit(0);
} else {
throw new Error(command + " is not a valid command.");
}
}
|
