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annotate react_games/backend/routes/todo.ts @ 71:75de5903355c

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Giagantic changes that update Dowa library to be more align with stb style array and hashmap. Updated Seobeo to be caching on server side instead of file level caching. Deleted bunch of things I don't really use.
author June Park <parkjune1995@gmail.com>
date Sun, 28 Dec 2025 20:34:22 -0800
parents fb9bcd3145cb
children
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37
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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1 import { Router } from 'express';
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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2 import * as fs from 'node:fs/promises';
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3 import path from 'node:path';
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4 import crypto from 'node:crypto';
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5
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6 type Todo = { id: string; value: string; status: number };
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7
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8 /** Idk aynthing about encryption but this seemed fine to me so just going to use this... **/
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9 const ALGO = 'aes-256-gcm';
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10 const KEYLEN = 32;
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11 const IVLEN = 12;
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12 const SALTLEN = 16;
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13 const PEPPER = process.env.TODO_PEPPER ?? ''; // optional server-side secret
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14
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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15 type EncryptedPayload = {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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16 v: 1;
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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17 kdf: 'scrypt';
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18 salt: string; // base64
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19 iv: string; // base64
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20 tag: string; // base64
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21 ciphertext: string;// base64
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22 };
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23
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24 // ---- crypto helpers --------------------------------------------------------
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25
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26 function kdf(passphrase: string, salt: Buffer): Buffer {
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27 // scryptSync is fine for small payloads; use async/promisified if you prefer.
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28 return crypto.scryptSync(passphrase, salt, KEYLEN);
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29 }
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30
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31 function encryptJSON(data: unknown, keyword: string): EncryptedPayload {
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32 const salt = crypto.randomBytes(SALTLEN);
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33 const key = kdf(keyword + PEPPER, salt);
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34 const iv = crypto.randomBytes(IVLEN);
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35
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36 const cipher = crypto.createCipheriv(ALGO, key, iv);
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37 const plaintext = Buffer.from(JSON.stringify(data), 'utf8');
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38 const ciphertext = Buffer.concat([cipher.update(plaintext), cipher.final()]);
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39 const tag = cipher.getAuthTag();
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40
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41 return {
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42 v: 1,
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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43 kdf: 'scrypt',
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44 salt: salt.toString('base64'),
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45 iv: iv.toString('base64'),
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46 tag: tag.toString('base64'),
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47 ciphertext: ciphertext.toString('base64'),
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48 };
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49 }
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50
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51 function decryptJSON(payload: EncryptedPayload, keyword: string): any {
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52 const salt = Buffer.from(payload.salt, 'base64');
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53 const iv = Buffer.from(payload.iv, 'base64');
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54 const tag = Buffer.from(payload.tag, 'base64');
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55 const ciphertext = Buffer.from(payload.ciphertext, 'base64');
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56
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57 const key = kdf(keyword + PEPPER, salt);
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58 const decipher = crypto.createDecipheriv(ALGO, key, iv);
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59 decipher.setAuthTag(tag);
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60
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61 const plaintext = Buffer.concat([decipher.update(ciphertext), decipher.final()]);
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62 return JSON.parse(plaintext.toString('utf8'));
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63 }
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64
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65 // ---- path helper: derive a file path from keyword --------------------------
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66
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67 function pathForKeyword(baseDir: string, keyword: string): string {
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68 // Hash the keyword so you don’t leak it in the filename and to avoid FS-unsafe chars.
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69 const h = crypto.createHash('sha256').update(keyword, 'utf8').digest('hex');
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70 // Optional sharding to keep directories small:
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71 return path.join(baseDir, h.slice(0, 2), `${h}.json`);
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72 }
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73
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74 // ---- router ----------------------------------------------------------------
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75 const getInitialTodos = () => [
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76 {
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77 id: crypto.randomUUID(),
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78 value: "Hello from TODO",
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79 status: 0,
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80 }
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81 ]
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82 export function createTodoRouter(dataFileOrDir: string) {
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83 const router = Router();
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84
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85 // Support both a file path (old) or a directory (new). We’ll store under that directory.
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86 const baseDir = path.extname(dataFileOrDir)
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87 ? path.dirname(dataFileOrDir)
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88 : dataFileOrDir;
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89
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90 const requireKeyword = (req: any): string => {
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91 const key = (typeof req.query.key === 'string' && req.query.key) || req.header('x-keyword');
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92 if (typeof key !== 'string' || !key.trim()) {
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93 throw Object.assign(new Error('Missing ?key= query or x-keyword header'), { status: 400 });
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94 }
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95 return key.trim();
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96 };
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97
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98 const readTodos = async (userKeyword: string): Promise<Todo[]> => {
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99 const filePath = pathForKeyword(baseDir, userKeyword);
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100 try {
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101 const raw = await fs.readFile(filePath, 'utf8');
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102 const parsed = JSON.parse(raw);
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103
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104 // If this looks like an encrypted payload, decrypt; else treat as plaintext array for backward compat.
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105 if (parsed && parsed.ciphertext && parsed.iv && parsed.tag && parsed.salt) {
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106 return decryptJSON(parsed as EncryptedPayload, userKeyword) as Todo[];
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107 }
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108 // fallback (legacy plaintext)
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109 return parsed as Todo[];
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110 } catch (e: any) {
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111 if (e?.code === 'ENOENT') {
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112 const initial = getInitialTodos();
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113 await writeTodos(initial, userKeyword); // create the file immediately
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114 return initial;
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115 }
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116 throw e;
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117 }
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118 };
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119
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120 const writeTodos = async (todos: Todo[], userKeyword: string) => {
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121 const filePath = pathForKeyword(baseDir, userKeyword);
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122 await fs.mkdir(path.dirname(filePath), { recursive: true });
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123 const payload = encryptJSON(todos, userKeyword);
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124 await fs.writeFile(filePath, JSON.stringify(payload, null, 2), { encoding: 'utf8', mode: 0o600 });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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125 };
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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126
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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127 router.get('/', async (req, res) => {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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128 try {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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129 const keyword = requireKeyword(req);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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130 const todos = await readTodos(keyword);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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131 res.json({ todos });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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132 } catch (err: any) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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133 res.status(err?.status || 500).json({ error: err?.message || 'Internal error' });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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134 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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135 });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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136
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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137 router.post('/', async (req, res) => {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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138 try {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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139 const keyword = requireKeyword(req);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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140
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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141 const body = req.body?.newTodo;
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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142 if (!body || typeof body.value !== 'string' || typeof body.status !== 'number') {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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143 return res.status(400).json({ newTodo: null });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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144 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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145
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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146 const todos = await readTodos(keyword);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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147 const todo: Todo = {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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148 id: body.id ?? crypto.randomUUID(),
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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149 value: body.value,
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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150 status: body.status,
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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151 };
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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152 todos.push(todo);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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153
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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154 // Optional chaos test:
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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155 // await new Promise(r => setTimeout(r, 1000));
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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156 // if (Math.random() > 0.5) return res.status(400).json({ newTodo: null });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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157
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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158 await writeTodos(todos, keyword);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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159 res.status(200).json({ newTodo: todo, todos }); // keep your shape if you prefer
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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160 } catch (err: any) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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161 res.status(err?.status || 500).json({ error: err?.message || 'Internal error' });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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162 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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163 });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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164
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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165 router.patch('/', async (req, res) => {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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166 try {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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167 const keyword = requireKeyword(req);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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168
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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169 const body = req.body;
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
170 if (!body || typeof body.todoId !== 'string' || typeof body.status !== 'number') {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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171 return res.status(400).json({ newTodo: null });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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172 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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173
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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174 const todos = (await readTodos(keyword)).map(
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
175 (todo) => todo.id === body.todoId ? {...todo, status: body.status } : todo);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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176
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
177 await writeTodos(todos, keyword);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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178 res.status(200).json({ todos });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
179 } catch (err: any) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
180 res.status(err?.status || 500).json({ error: err?.message || 'Internal error' });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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181 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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182 });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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183
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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184
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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185 return router;
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
186 }