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Add optional (disabled by default) support for requiring new DIDs to …
…complete a proof-of-work challenge before using the server
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| import { createHash } from 'crypto'; | ||
| import type { Request, Response } from 'express'; | ||
| import type { Express } from 'express'; | ||
| import type { Dialect } from 'kysely'; | ||
| import { Kysely } from 'kysely'; | ||
|
|
||
| const recentChallenges: { [challenge: string]: number } = {}; | ||
| const CHALLENGE_TIMEOUT = 60 * 1000; | ||
|
|
||
| export class ProofOfWork { | ||
| #db: Kysely<PowDatabase>; | ||
|
|
||
| constructor(dialect: Dialect) { | ||
| this.#db = new Kysely<PowDatabase>({ dialect: dialect }); | ||
| } | ||
|
|
||
| async initialize(): Promise<void> { | ||
| setInterval(() => { | ||
| for (const challenge of Object.keys(recentChallenges)) { | ||
| if ( | ||
| recentChallenges[challenge] && | ||
| Date.now() - recentChallenges[challenge] > CHALLENGE_TIMEOUT | ||
| ) { | ||
| delete recentChallenges[challenge]; | ||
| } | ||
| } | ||
| }, CHALLENGE_TIMEOUT / 4); | ||
|
|
||
| await this.#db.schema | ||
| .createTable('authorizedTenants') | ||
| .ifNotExists() | ||
| .addColumn('did', 'text', (column) => column.primaryKey()) | ||
| .execute(); | ||
| } | ||
|
|
||
| setupRoutes(server: Express): void { | ||
| server.get('/register', (req: Request, res: Response) => | ||
| this.getChallenge(req, res), | ||
| ); | ||
| server.post('/register', (req: Request, res: Response) => | ||
| this.verifyChallenge(req, res), | ||
| ); | ||
| } | ||
|
|
||
| async isAuthorized(tenant: string): Promise<boolean> { | ||
| const result = await this.#db | ||
| .selectFrom('authorizedTenants') | ||
| .select('did') | ||
| .where('did', '=', tenant) | ||
| .execute(); | ||
|
|
||
| return result.length > 0; | ||
| } | ||
|
|
||
| private async getChallenge(_req: Request, res: Response): Promise<void> { | ||
| const challenge = generateChallenge(); | ||
| recentChallenges[challenge] = Date.now(); | ||
| res.json({ | ||
| challenge: challenge, | ||
| complexity: getComplexity(), | ||
| }); | ||
| } | ||
|
|
||
| private async verifyChallenge(req: Request, res: Response): Promise<void> { | ||
| const body: { | ||
| did: string; | ||
| challenge: string; | ||
| response: string; | ||
| } = req.body; | ||
|
|
||
| const hash = createHash('sha256'); | ||
| hash.update(body.challenge); | ||
| hash.update(body.response); | ||
|
|
||
| const complexity = getComplexity(); | ||
| const digest = hash.digest('hex'); | ||
| console.log('digest: ', digest); | ||
| if (!digest.startsWith('0'.repeat(complexity))) { | ||
| res.status(401).json({ success: false }); | ||
| return; | ||
| } | ||
|
|
||
| try { | ||
| await this.#db | ||
| .insertInto('authorizedTenants') | ||
| .values({ did: body.did }) | ||
| .executeTakeFirst(); | ||
| } catch (e) { | ||
| console.log('error inserting did', e); | ||
| res.status(500).json({ success: false }); | ||
| return; | ||
| } | ||
| res.json({ success: true }); | ||
| } | ||
| } | ||
|
|
||
| const challengeCharacters = | ||
| 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; | ||
|
|
||
| function generateChallenge(): string { | ||
| let challenge = ''; | ||
| while (challenge.length < 10) { | ||
| challenge += challengeCharacters.charAt( | ||
| Math.floor(Math.random() * challengeCharacters.length), | ||
| ); | ||
| } | ||
| return challenge; | ||
| } | ||
|
|
||
| function getComplexity(): number { | ||
| return Object.keys(recentChallenges).length; | ||
| } | ||
| interface AuthorizedTenants { | ||
| did: string; | ||
| } | ||
|
|
||
| interface PowDatabase { | ||
| authorizedTenants: AuthorizedTenants; | ||
| } |
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