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.zed/settings.json Normal file
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{
"lsp": {
"deno": {
"settings": {
"deno": {
"enable": true
}
}
}
},
"languages": {
"TypeScript": {
"language_servers": [
"deno",
"!typescript-language-server",
"!vtsls",
"!eslint"
],
"formatter": "language_server"
},
"TSX": {
"language_servers": [
"deno",
"!typescript-language-server",
"!vtsls",
"!eslint"
],
"formatter": "language_server"
}
}
}

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under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# `@blah-im/core`
This is an implementation of Blah Core Protocol in TypeScript.
## Installation
```bash
# Installing from npm registry
# You can use other npm-compatiable package managers too.
npm install @blah-im/core
# Installing from JSR
deno add jsr:@blah/core
```
## Usage
A symbol API document is available on JSR: https://jsr.io/@blah/core/doc
## License
This project is licensed under GNU General Public License v3.0. See [LICENSE](LICENSE) for more details.

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// A simple adoption of https://github.com/erdtman/canonicalize/blob/master/lib/canonicalize.js
export default function canonicalize(object: unknown) {
if (typeof object === "number" && isNaN(object)) {
throw new Error("NaN is not allowed");
}
if (typeof object === "number" && !isFinite(object)) {
throw new Error("Infinity is not allowed");
}
if (object === null || typeof object !== "object") {
return JSON.stringify(object);
}
if ("toJSON" in object && object.toJSON instanceof Function) {
return canonicalize(object.toJSON());
}
if (Array.isArray(object)) {
const values = object.reduce((t, cv, ci) => {
const comma = ci === 0 ? "" : ",";
const value = cv === undefined || typeof cv === "symbol" ? null : cv;
return `${t}${comma}${canonicalize(value)}`;
}, "");
return `[${values}]`;
}
const values = Object.keys(object).sort().reduce((t, cv): string => {
const value: unknown = (object as Record<string, unknown>)[cv];
if (
value === undefined ||
typeof value === "symbol"
) {
return t;
}
const comma = t.length === 0 ? "" : ",";
return `${t}${comma}${canonicalize(cv)}:${canonicalize(value)}`;
}, "");
return `{${values}}`;
}

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import { expect } from "@std/expect";
import { BlahKeyPair } from "./mod.ts";
let keypair: BlahKeyPair;
Deno.test("generate keypair", async () => {
keypair = await BlahKeyPair.generate();
});
Deno.test("encode & decode keypair", async () => {
const encoded = await keypair.encode();
const decoded = await BlahKeyPair.fromEncoded(encoded);
expect(decoded.id).toBe(keypair.id);
});
Deno.test("sign & verify payload", async () => {
const payload = { foo: "bar", baz: 123 };
const signedPayload = await keypair.signPayload(payload);
const verifiedPayload = await keypair.publicIdentity.verifyPayload(
signedPayload,
);
expect(verifiedPayload).toEqual(payload);
});
Deno.test("sign & verify payload with wrong keypair", async () => {
const keypair2 = await BlahKeyPair.generate();
const payload = { foo: "bar", baz: 123 };
const signedPayload = await keypair.signPayload(payload);
expect(keypair2.publicIdentity.verifyPayload(signedPayload))
.rejects.toMatch(/sign/);
});
Deno.test("sign & verify payload with wrong key order but should still work", async () => {
const payload = { foo: "bar", baz: 123 };
const signedPayload = await keypair.signPayload(payload);
const signedPayload2 = {
sig: signedPayload.sig,
signee: {
payload: { baz: 123, foo: "bar" },
user: signedPayload.signee.user,
nonce: signedPayload.signee.nonce,
timestamp: signedPayload.signee.timestamp,
},
};
const verifiedPayload = await keypair.publicIdentity.verifyPayload(
signedPayload2,
);
expect(verifiedPayload).toEqual(payload);
});

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import canonicalize from "./canonicalize.ts";
import { BlahPublicIdentity } from "./publicIdentity.ts";
import type { BlahPayloadSignee, BlahSignedPayload } from "./signedPayload.ts";
import { bufToHex } from "./utils.ts";
export type EncodedBlahKeyPair = {
v: "0";
id: string;
privateKey: JsonWebKey;
};
export class BlahKeyPair {
publicIdentity: BlahPublicIdentity;
private privateKey: CryptoKey;
get id() {
return this.publicIdentity.id;
}
get name() {
return this.publicIdentity.name;
}
private constructor(
publicIdentity: BlahPublicIdentity,
privateKey: CryptoKey,
) {
this.publicIdentity = publicIdentity;
this.privateKey = privateKey;
}
static async generate(): Promise<BlahKeyPair> {
const { publicKey, privateKey } = await crypto.subtle.generateKey(
"Ed25519",
true,
[
"sign",
"verify",
],
) as CryptoKeyPair;
const publicIdentity = await BlahPublicIdentity.fromPublicKey(publicKey);
return new BlahKeyPair(publicIdentity, privateKey);
}
static async fromEncoded(encoded: EncodedBlahKeyPair): Promise<BlahKeyPair> {
if (encoded.v !== "0") {
throw new Error("Unsupported version");
}
const publicIdentity = await BlahPublicIdentity.fromID(encoded.id);
const privateKey = await crypto.subtle.importKey(
"jwk",
encoded.privateKey,
{ name: "Ed25519" },
true,
["sign"],
);
return new BlahKeyPair(publicIdentity, privateKey);
}
async encode(): Promise<EncodedBlahKeyPair> {
return {
v: "0",
id: this.publicIdentity.id,
privateKey: await crypto.subtle.exportKey("jwk", this.privateKey),
};
}
async signPayload<P>(
payload: P,
date: Date = new Date(),
): Promise<BlahSignedPayload<P>> {
const nonceBuf = new Uint32Array(1);
crypto.getRandomValues(nonceBuf);
const timestamp = Math.floor(date.getTime() / 1000);
const signee: BlahPayloadSignee<P> = {
nonce: nonceBuf[0],
payload,
timestamp,
user: this.id,
};
const signeeBytes = new TextEncoder().encode(canonicalize(signee));
const rawSig = await crypto.subtle.sign(
"Ed25519",
this.privateKey,
signeeBytes,
);
return {
sig: bufToHex(rawSig),
signee,
};
}
}

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export * from "./keypair.ts";
export * from "./publicIdentity.ts";
export * from "./signedPayload.ts";
export * from "./utils.ts";

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import canonicalize from "./canonicalize.ts";
import type { BlahSignedPayload } from "./signedPayload.ts";
import { bufToHex, hexToBuf } from "./utils.ts";
export class BlahPublicIdentity {
private publicKey: CryptoKey;
id: string;
name: string;
private constructor(publicKey: CryptoKey, id: string) {
this.publicKey = publicKey;
this.id = id;
// First 4 and last 4 characters of the id
this.name = id.slice(0, 4) + "..." + id.slice(-4);
}
static async fromPublicKey(
publicKey: CryptoKey,
): Promise<BlahPublicIdentity> {
const rawKey = await crypto.subtle.exportKey("raw", publicKey);
const id = bufToHex(rawKey);
return new BlahPublicIdentity(publicKey, id);
}
static async fromID(id: string): Promise<BlahPublicIdentity> {
const rawKey = hexToBuf(id);
const publicKey = await crypto.subtle.importKey(
"raw",
rawKey,
{ name: "Ed25519" },
true,
[
"verify",
],
);
return new BlahPublicIdentity(publicKey, id);
}
static async verifyPayload<P>(
signedPayload: BlahSignedPayload<P>,
): Promise<{ payload: P; identity: BlahPublicIdentity }> {
const { signee } = signedPayload;
const identity = await BlahPublicIdentity.fromID(signee.user);
return { payload: await identity.verifyPayload(signedPayload), identity };
}
async verifyPayload<P>(signedPayload: BlahSignedPayload<P>): Promise<P> {
const { sig, signee } = signedPayload;
if (signee.user !== this.id) {
throw new Error(
`Payload is not signed by this identity. Was signed by ${signee.user}.`,
);
}
const signeeBytes = new TextEncoder().encode(canonicalize(signee));
const result = await crypto.subtle.verify(
"Ed25519",
this.publicKey,
hexToBuf(sig),
signeeBytes,
);
if (!result) {
throw new Error("Invalid signature");
}
return signee.payload;
}
}

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export type BlahPayloadSignee<P> = {
nonce: number;
payload: P;
timestamp: number;
user: string;
act_key?: string;
};
export type BlahSignedPayload<P> = {
sig: string;
signee: BlahPayloadSignee<P>;
};

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export function bufToHex(buf: ArrayBufferLike): string {
return [...new Uint8Array(buf)].map((x) => x.toString(16).padStart(2, "0"))
.join("");
}
export function hexToBuf(hex: string): Uint8Array {
return new Uint8Array(
(hex.match(/[\da-f]{2}/gi) ?? []).map((m) => parseInt(m, 16)),
);
}

6
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{
"imports": {
"@deno/dnt": "jsr:@deno/dnt@^0.41.3",
"@std/expect": "jsr:@std/expect@^1.0.3"
}
}

150
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{
"version": "3",
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"jsr:@std/fs@^0.229.3": "jsr:@std/fs@0.229.3",
"jsr:@std/internal@^1.0.3": "jsr:@std/internal@1.0.3",
"jsr:@std/io@^0.223": "jsr:@std/io@0.223.0",
"jsr:@std/path@1": "jsr:@std/path@1.0.6",
"jsr:@std/path@1.0.0-rc.1": "jsr:@std/path@1.0.0-rc.1",
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"jsr:@ts-morph/bootstrap@^0.24.0": "jsr:@ts-morph/bootstrap@0.24.0",
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},
"jsr": {
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}
},
"remote": {},
"workspace": {
"dependencies": [
"jsr:@deno/dnt@^0.41.3",
"jsr:@std/expect@^1.0.3"
]
}
}

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import { build, emptyDir } from "@deno/dnt";
await emptyDir("./npm");
await build({
entryPoints: ["./mod.ts"],
outDir: "./npm",
shims: {
// see JS docs for overview and more options
deno: true,
},
package: {
// package.json properties
name: "@blah-im/core",
version: Deno.args[0],
description: "Core logic & types for Blah IM.",
license: "GPL-3.0-only",
repository: {
type: "git",
url: "git+https://github.com/blah-im/typescript-core.git",
},
bugs: {
url: "https://github.com/blah-im/typescript-core/issues",
},
},
postBuild() {
// steps to run after building and before running the tests
Deno.copyFileSync("LICENSE", "npm/LICENSE");
Deno.copyFileSync("README.md", "npm/README.md");
},
});