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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 fc7df1718c
commit 6d2ae89a3b
2 changed files with 26 additions and 4 deletions
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19
api/src/util/RandomInviteID.ts
View File

@ -1,3 +1,5 @@
import { Snowflake } from "@fosscord/util";
export function random(length = 6) {
// Declare all characters
let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
@ -10,3 +12,20 @@ export function random(length = 6) {
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
}

11
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:
*
@ -83,14 +83,17 @@ export class Snowflake {
return dec;
}
static generate() {
static generateWorkerProcess() { // worker process - returns a number
var time = BigInt(Date.now() - Snowflake.EPOCH) << BigInt(22);
var worker = Snowflake.workerId << 17n;
var process = Snowflake.processId << 12n;
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.
* @typedef {Object} DeconstructedSnowflake