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snowflake-based invite generation

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This commit is contained in:
Erkin Alp Güney 2021-11-28 11:25:41 +03:00
parent f76b6e4bff
commit 73c5141e05
2 changed files with 26 additions and 4 deletions
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19
api/src/util/RandomInviteID.ts
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@ -1,3 +1,5 @@
import { Snowflake } from "@fosscord/util";
export function random(length = 6) { export function random(length = 6) {
// Declare all characters // Declare all characters
let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
@ -10,3 +12,20 @@ export function random(length = 6) {
return str; return str;
} }
export function snowflakeBasedInvite() {
// Declare all characters
let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
let snowflake = Snowflake.generateWorkerProcess();
// snowflakes hold ~10.75 characters worth of entropy;
// safe to generate a 8-char invite out of them
let str = "";
for (let i=0; i < 10; i++) {
str += chars.charAt((snowflake % chars.length));
snowflake /= chars.length;
}
return str.substr(3,8).reverse(); // little-endianise for entropy
}

9
util/src/util/Snowflake.ts
View File

@ -21,7 +21,7 @@ export class Snowflake {
} }
/** /**
* A Twitter snowflake, except the epoch is 2015-01-01T00:00:00.000Z * A Twitter-like snowflake, except the epoch is 2015-01-01T00:00:00.000Z
* ``` * ```
* If we have a snowflake '266241948824764416' we can represent it as binary: * If we have a snowflake '266241948824764416' we can represent it as binary:
* *
@ -83,14 +83,17 @@ export class Snowflake {
return dec; return dec;
} }
static generate() { static generateWorkerProcess() { // worker process - returns a number
var time = BigInt(Date.now() - Snowflake.EPOCH) << BigInt(22); var time = BigInt(Date.now() - Snowflake.EPOCH) << BigInt(22);
var worker = Snowflake.workerId << 17n; var worker = Snowflake.workerId << 17n;
var process = Snowflake.processId << 12n; var process = Snowflake.processId << 12n;
var increment = Snowflake.INCREMENT++; var increment = Snowflake.INCREMENT++;
return (time | worker | process | increment).toString(); return BigInt(time | worker | process | increment);
} }
static generate() {
return Snowflake.generateWorkerProcess().toString();
}
/** /**
* A deconstructed snowflake. * A deconstructed snowflake.
* @typedef {Object} DeconstructedSnowflake * @typedef {Object} DeconstructedSnowflake