added endpoints to fetch captchas

src/controllers/captcha.js

@@ -14,6 +14,28 @@ class CaptchaController {
         }
         return res.status(200).send({"message": "Success"});
     }
+
+    async get(req, res) {
+        try {
+            const { id } = req.params;
+            const captcha = await CaptchaService.get(id);
+            if (captcha == undefined) return res.status(404).send({"message":"no such captcha found"});
+            return res.status(200).send({"message":"success", "captcha": captcha})
+        } catch (e) {
+            console.log(`Error upon requesting one captcha: ${e}`)
+            if (e.code == 'ENOENT') return res.status(404).send({"message": "The ID exists in the DB but I can't find an actual image. Please, contact the developer."})
+            return res.status(500).send({"message": "Unknown server error. Please, contact the developer."})
+        }
+    }
+
+    async get_all(req, res) {
+        try {
+            return res.status(200).send({"message":"success", "captchas": await CaptchaService.get_all()});
+        } catch (e) {
+            console.log(`Error upon requesting all captchas: ${e}`)
+            return res.status(500).send({"message": "Unknown server error. Please, contact the developer."})
+        }
+    }
 }
 
 export default new CaptchaController();

src/routers/captcha.js

@@ -6,5 +6,7 @@ import auth from '../middlewares/auth.js';
 const CaptchaRouter = new Router();
 
 CaptchaRouter.post('/captcha/submit', auth.verify_user_jwt, CaptchaController.submit);
+CaptchaRouter.get('/captcha/all', CaptchaController.get_all);
+CaptchaRouter.get('/captcha/:id', CaptchaController.get);
 
 export default CaptchaRouter;

src/services/captcha.js

@@ -2,6 +2,7 @@ import db from '../db.js';
 import fs from 'fs/promises';
 import config from '../config.js';
 import { createHash } from 'crypto';
+import captcha from '../controllers/captcha.js';
 
 function base64ToArrayBuffer(base64) {
     var binaryString = atob(base64);
@@ -21,6 +22,20 @@ class CaptchaService {
         await fs.writeFile(`${config.data_dir}/${hash}.jpeg`, b64, 'base64');
         await db.query("INSERT INTO captchas (hash, solution, submitter) VALUES ($1, $2, $3)", [hash, solution, submitter]);
     }
+
+    async get(id) {
+        const captcha = (await db.query("SELECT hash, solution FROM captchas WHERE id = $1", [id])).rows[0];
+        if (captcha == undefined) return undefined;
+
+        const path = `${config.data_dir}/${captcha.hash}.jpeg`;
+
+        const image = Buffer.from(await fs.readFile(path)).toString('base64');
+        return {"image": image, "solution": captcha.solution, "hash": captcha.hash};
+    }
+
+    async get_all() {
+        return (await db.query("SELECT id FROM captchas")).rows
+    }
 }
 
 export default new CaptchaService();