@riddance/aws-host
Version:
This is `@riddance/aws-host`, a TypeScript AWS Lambda host adapter for the Riddance serverless framework. It provides AWS-specific implementations for HTTP, event, timer, and context handling in Lambda functions by providing Lambda entry points that trans
161 lines • 23.5 kB
JavaScript
import { fetchOK, missing, thrownHasStatus } from '@riddance/fetch';
import { SignatureV4 } from '@smithy/signature-v4';
import { createHash, createHmac, randomUUID } from 'node:crypto';
import { brotliCompress } from 'node:zlib';
export class SnsEventTransport {
#attributes;
#env;
#baseUrl;
#baseArn;
constructor(client, context, account) {
this.#attributes = asMessageAttributes(client);
this.#env = context.env;
const region = context.env.AWS_REGION ?? 'us-east-1';
this.#baseUrl = `https://sns.${region}.amazonaws.com`;
const prefix = context.env.AWS_LAMBDA_FUNCTION_NAME?.slice(0, -(context.meta?.packageName.length ?? 0) - (context.meta?.fileName.length ?? 0) - 2) ?? 'AWS_LAMBDA_FUNCTION_NAME-missing';
this.#baseArn = `arn:aws:sns:${region}:${account}:${prefix}-`;
}
async sendEvent(topic, type, subject, data, messageId, signal) {
try {
const { message, additionalAttributes } = await prepareMessage(data, this.#attributes);
await awsFetchOK(this.#env, this.#baseUrl, {
headers: {
'content-type': 'application/x-www-form-urlencoded',
'x-amz-date': new Date().toISOString(),
},
method: 'POST',
body: new URLSearchParams({
Version: '2010-03-31',
Action: 'Publish',
TopicArn: `${this.#baseArn}${topic}-${type}`,
Message: message ?? 'null',
Subject: subject,
MessageId: messageId ?? randomUUID().replaceAll('-', ''),
Type: type,
...this.#attributes,
...additionalAttributes,
}).toString(),
signal,
}, 'Error publishing SNS message.', { topic, type, data });
}
catch (e) {
if (thrownHasStatus(e, 404)) {
return;
}
throw e;
}
}
}
async function prepareMessage(data, baseAttributes) {
if (!data) {
return {};
}
const jsonMessage = JSON.stringify(data);
if (jsonMessage.length < 8192) {
return { message: jsonMessage };
}
return {
message: await compressMessage(jsonMessage),
additionalAttributes: asMessageAttributes({ 'content-encoding': 'br' }, baseAttributes),
};
}
async function compressMessage(jsonMessage) {
const compressed = await brotliCompressAsync(jsonMessage);
return compressed.toString('base64');
}
function brotliCompressAsync(data) {
return new Promise((resolve, reject) => {
brotliCompress(Buffer.from(data, 'utf8'), (err, result) => {
if (err) {
reject(err);
return;
}
resolve(result);
});
});
}
function asMessageAttributes(obj, existingAttributes) {
const baseIndex = existingAttributes ? Object.keys(existingAttributes).length / 3 + 1 : 1;
return Object.fromEntries(Object.entries(obj)
.filter(withoutUndefinedValue)
.flatMap(([k, v], ix) => [
[`MessageAttributes.entry.${baseIndex + ix}.Name`, k],
[
`MessageAttributes.entry.${baseIndex + ix}.Value.DataType`,
typeof v === 'number' ? 'Number' : 'String',
],
[`MessageAttributes.entry.${baseIndex + ix}.Value.StringValue`, v.toString()],
]));
}
function withoutUndefinedValue(kvp) {
return kvp[1] !== undefined;
}
async function awsFetchOK(env, url, init, errorMessage, errorData) {
return fetchOK(url, {
...init,
headers: await awsHeaders(env, 'sns', url, init?.method ?? 'GET', init?.headers ?? {}, init?.body ?? ''),
}, errorMessage, errorData);
}
async function awsHeaders(env, service, url, method, headers, body) {
const signer = new SignatureV4({
service,
region: env.AWS_REGION ?? 'us-east-1',
sha256: AwsHash,
credentials: {
accessKeyId: env.AWS_ACCESS_KEY_ID ?? missing('AWS_ACCESS_KEY_ID'),
secretAccessKey: env.AWS_SECRET_ACCESS_KEY ?? missing('AWS_SECRET_ACCESS_KEY'),
sessionToken: env.AWS_SESSION_TOKEN,
},
});
const uri = new URL(url);
const query = {};
uri.searchParams.forEach((value, key) => {
query[key] = value;
});
const signed = await signer.sign({
method,
protocol: 'https:',
hostname: uri.hostname,
path: uri.pathname,
query,
headers: {
host: uri.hostname,
...headers,
},
body,
});
return signed.headers;
}
class AwsHash {
#secret;
#hash;
constructor(secret) {
this.#secret = secret;
this.#hash = makeHash(this.#secret);
}
digest() {
return Promise.resolve(this.#hash.digest());
}
reset() {
this.#hash = makeHash(this.#secret);
}
update(chunk) {
this.#hash.update(new Uint8Array(Buffer.from(chunk)));
}
}
function makeHash(secret) {
return secret ? createHmac('sha256', castSourceData(secret)) : createHash('sha256');
}
function castSourceData(data) {
if (Buffer.isBuffer(data)) {
return data;
}
if (typeof data === 'string') {
return Buffer.from(data);
}
if (ArrayBuffer.isView(data)) {
return Buffer.from(data.buffer, data.byteOffset, data.byteLength);
}
return Buffer.from(data);
}
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{ fetchOK, missing, thrownHasStatus } from '@riddance/fetch'\nimport { EventTransport, type ClientInfo } from '@riddance/host/context'\nimport type { Metadata } from '@riddance/host/registry'\nimport { SignatureV4 } from '@smithy/signature-v4'\nimport { createHash, createHmac, randomUUID, type Hash } from 'node:crypto'\nimport { brotliCompress } from 'node:zlib'\nimport type { Environment, Json } from '../context.js'\n\nexport class SnsEventTransport implements EventTransport {\n    readonly #attributes: { [key: string]: string }\n    readonly #env: Partial<Environment>\n    readonly #baseUrl: string\n    readonly #baseArn: string\n\n    constructor(\n        client: ClientInfo,\n        context: { env: Partial<Environment>; meta?: Metadata },\n        account: string,\n    ) {\n        this.#attributes = asMessageAttributes(client)\n        this.#env = context.env\n        const region = context.env.AWS_REGION ?? 'us-east-1'\n        this.#baseUrl = `https://sns.${region}.amazonaws.com`\n        const prefix =\n            context.env.AWS_LAMBDA_FUNCTION_NAME?.slice(\n                0,\n                -(context.meta?.packageName.length ?? 0) - (context.meta?.fileName.length ?? 0) - 2,\n            ) ?? 'AWS_LAMBDA_FUNCTION_NAME-missing'\n        this.#baseArn = `arn:aws:sns:${region}:${account}:${prefix}-`\n    }\n\n    async sendEvent(\n        topic: string,\n        type: string,\n        subject: string,\n        data:\n            | {\n                  readonly [key: string]: Json\n              }\n            | undefined,\n        messageId: string | undefined,\n        signal: AbortSignal,\n    ) {\n        try {\n            const { message, additionalAttributes } = await prepareMessage(data, this.#attributes)\n\n            await awsFetchOK(\n                this.#env,\n                this.#baseUrl,\n                {\n                    headers: {\n                        'content-type': 'application/x-www-form-urlencoded',\n                        'x-amz-date': new Date().toISOString(),\n                    },\n                    method: 'POST',\n                    body: new URLSearchParams({\n                        Version: '2010-03-31',\n                        Action: 'Publish',\n                        TopicArn: `${this.#baseArn}${topic}-${type}`,\n                        Message: message ?? 'null',\n                        Subject: subject,\n                        MessageId: messageId ?? randomUUID().replaceAll('-', ''),\n                        Type: type,\n                        ...this.#attributes,\n                        ...additionalAttributes,\n                    }).toString(),\n                    signal,\n                },\n                'Error publishing SNS message.',\n                { topic, type, data },\n            )\n        } catch (e) {\n            if (thrownHasStatus(e, 404)) {\n                return\n            }\n            throw e\n        }\n    }\n}\n\nasync function prepareMessage(\n    data:\n        | {\n              readonly [key: string]: Json\n          }\n        | undefined,\n    baseAttributes: { [key: string]: string },\n) {\n    if (!data) {\n        return {}\n    }\n    const jsonMessage = JSON.stringify(data)\n    if (jsonMessage.length < 8192) {\n        return { message: jsonMessage }\n    }\n\n    return {\n        message: await compressMessage(jsonMessage),\n        additionalAttributes: asMessageAttributes({ 'content-encoding': 'br' }, baseAttributes),\n    }\n}\n\nasync function compressMessage(jsonMessage: string) {\n    const compressed = await brotliCompressAsync(jsonMessage)\n    return compressed.toString('base64')\n}\n\nfunction brotliCompressAsync(data: string): Promise<Buffer> {\n    return new Promise((resolve, reject) => {\n        brotliCompress(Buffer.from(data, 'utf8'), (err, result) => {\n            if (err) {\n                reject(err)\n                return\n            }\n            resolve(result)\n        })\n    })\n}\n\nfunction asMessageAttributes(\n    obj: { [key: string]: string | number | undefined },\n    existingAttributes?: { [key: string]: unknown },\n) {\n    const baseIndex = existingAttributes ? Object.keys(existingAttributes).length / 3 + 1 : 1\n    return Object.fromEntries(\n        Object.entries(obj)\n            .filter(withoutUndefinedValue)\n            .flatMap(([k, v], ix) => [\n                [`MessageAttributes.entry.${baseIndex + ix}.Name`, k],\n                [\n                    `MessageAttributes.entry.${baseIndex + ix}.Value.DataType`,\n                    typeof v === 'number' ? 'Number' : 'String',\n                ],\n                [`MessageAttributes.entry.${baseIndex + ix}.Value.StringValue`, v.toString()],\n            ]),\n    )\n}\n\nfunction withoutUndefinedValue(\n    kvp: [string, string | number | undefined],\n): kvp is [string, string | number] {\n    return kvp[1] !== undefined\n}\n\ntype RequestInit = {\n    method: string\n    headers?: { [key: string]: string }\n    body?: string\n    signal: AbortSignal\n}\n\nasync function awsFetchOK(\n    env: { [key: string]: string | undefined },\n    url: string,\n    init: RequestInit | undefined,\n    errorMessage: string,\n    errorData?: {\n        [key: string]: unknown\n    },\n) {\n    return fetchOK(\n        url,\n        {\n            ...init,\n            headers: await awsHeaders(\n                env,\n                'sns',\n                url,\n                init?.method ?? 'GET',\n                init?.headers ?? {},\n                init?.body ?? '',\n            ),\n        },\n        errorMessage,\n        errorData,\n    )\n}\n\nasync function awsHeaders(\n    env: { [key: string]: string | undefined },\n    service: string,\n    url: string,\n    method: string,\n    headers: { [key: string]: string },\n    body: string,\n) {\n    const signer = new SignatureV4({\n        service,\n        region: env.AWS_REGION ?? 'us-east-1',\n        sha256: AwsHash,\n        credentials: {\n            accessKeyId: env.AWS_ACCESS_KEY_ID ?? missing('AWS_ACCESS_KEY_ID'),\n            secretAccessKey: env.AWS_SECRET_ACCESS_KEY ?? missing('AWS_SECRET_ACCESS_KEY'),\n            sessionToken: env.AWS_SESSION_TOKEN,\n        },\n    })\n    const uri = new URL(url)\n    const query: { [key: string]: string } = {}\n    uri.searchParams.forEach((value, key) => {\n        query[key] = value\n    })\n    const signed = await signer.sign({\n        method,\n        protocol: 'https:',\n        hostname: uri.hostname,\n        path: uri.pathname,\n        query,\n        headers: {\n            host: uri.hostname,\n            ...headers,\n        },\n        body,\n    })\n    return signed.headers\n}\n\ntype SourceData = string | ArrayBuffer | ArrayBufferView\n\nclass AwsHash {\n    readonly #secret?: SourceData\n    #hash: Hash | ReturnType<typeof createHmac>\n\n    constructor(secret?: SourceData) {\n        this.#secret = secret\n        this.#hash = makeHash(this.#secret)\n    }\n\n    digest() {\n        return Promise.resolve(this.#hash.digest())\n    }\n\n    reset() {\n        this.#hash = makeHash(this.#secret)\n    }\n\n    update(chunk: Uint8Array) {\n        this.#hash.update(new Uint8Array(Buffer.from(chunk)))\n    }\n}\n\nfunction makeHash(secret?: SourceData) {\n    return secret ? createHmac('sha256', castSourceData(secret)) : createHash('sha256')\n}\n\nfunction castSourceData(data: SourceData) {\n    if (Buffer.isBuffer(data)) {\n        return data\n    }\n    if (typeof data === 'string') {\n        return Buffer.from(data)\n    }\n    if (ArrayBuffer.isView(data)) {\n        return Buffer.from(data.buffer, data.byteOffset, data.byteLength)\n    }\n    return Buffer.from(data)\n}\n"]}