forked from Yara724/api
44 lines
1.0 KiB
TypeScript
44 lines
1.0 KiB
TypeScript
import { Injectable } from "@nestjs/common";
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import { ConfigService } from "@nestjs/config";
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import * as svgCaptcha from "svg-captcha";
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export interface GeneratedCaptcha {
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text: string;
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image: string;
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expiresAt: number;
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}
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@Injectable()
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export class CaptchaService {
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generate(): GeneratedCaptcha {
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const captcha = svgCaptcha.create({
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size: 5,
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ignoreChars: "0oO1ilI",
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noise: 3,
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color: true,
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background: "#f8fafc",
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width: 160,
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height: 56,
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fontSize: 52,
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});
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return {
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text: captcha.text,
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image: `data:image/svg+xml;base64,${Buffer.from(captcha.data, "utf8").toString("base64")}`,
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expiresAt: this.buildExpireAt(),
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};
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}
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normalizeAnswer(input: string): string {
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return input.trim().toLowerCase();
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}
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buildExpireAt(): number {
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const raw = Number(
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process.env.EXP_CAPTCHA_TIME ?? process.env.EXP_OTP_TIME ?? "2",
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);
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const minutes = Number.isFinite(raw) && raw > 0 ? raw : 2;
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return Date.now() + minutes * 60 * 1000;
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}
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}
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