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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | 12x 12x 12x 3x 3x 3x 12x 12x 1x 1x 1x 2x 2x 2x | import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { createHash, timingSafeEqual as nodeTimingSafeEqual } from 'crypto';
function safeEqual(a: string, b: string): boolean {
const A = Buffer.from(a, 'utf8');
const B = Buffer.from(b, 'utf8');
return A.length === B.length && nodeTimingSafeEqual(A, B);
}
@Injectable()
export class ClickSigningService {
constructor(private readonly config: ConfigService) {}
verifyPrepareSig(p: {
click_trans_id: string;
service_id: number;
merchant_trans_id: string;
amount: number;
action: number;
sign_time: string;
sign_string: string;
}): boolean {
const secret = this.config.get<string>('CLICK_SECRET_KEY') || '';
const expected = createHash('md5')
.update(`${p.click_trans_id}${p.service_id}${secret}${p.merchant_trans_id}${p.amount}${p.action}${p.sign_time}`)
.digest('hex');
return safeEqual(expected, p.sign_string);
}
verifyCompleteSig(p: {
click_trans_id: string;
service_id: number;
merchant_trans_id: string;
merchant_prepare_id: number;
amount: number;
action: number;
sign_time: string;
sign_string: string;
}): boolean {
const secret = this.config.get<string>('CLICK_SECRET_KEY') || '';
const expected = createHash('md5')
.update(`${p.click_trans_id}${p.service_id}${secret}${p.merchant_trans_id}${p.merchant_prepare_id}${p.amount}${p.action}${p.sign_time}`)
.digest('hex');
return safeEqual(expected, p.sign_string);
}
}
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