Ora il db funge più veramente e si possono inviare i problemi

client/components/Problem.jsx

@@ -1,12 +1,13 @@
 import { Markdown } from './Markdown.jsx'
 
-export const Problem = ({ id, content }) => {
+export const Problem = ({ id, content, createdBy }) => {
     return (
         <div class="problem">
             <div class="problem-header">
                 <div class="problem-title">
                     <a href={`/problem/${id}`}>Problema {id}</a>
                 </div>
+                {createdBy && <div class="problem-author">Creato da @{createdBy}</div>}
             </div>
             <div class="problem-content">
                 <Markdown source={content} />

client/components/Solution.jsx

@@ -0,0 +1,14 @@
+import { Markdown } from './Markdown.jsx'
+
+export const Solution = ({ userId, content }) => {
+    return (
+        <div class="solution">
+            <div class="solution-header">
+                <div>@{userId}</div>
+            </div>
+            <div class="solution-content">
+                <Markdown source={content} />
+            </div>
+        </div>
+    )
+}

client/entry-client.jsx

@@ -2,3 +2,11 @@ import { hydrate } from 'preact'
 import { App } from './App.jsx'
 
 hydrate(<App />, document.body)
+
+window.fetchServer = url => {
+    fetch(url, { credentials: 'include' })
+        .then(res => res.ok && res.json())
+        .then(data => {
+            console.log(data)
+        })
+}

client/entry-server.jsx

@@ -1,6 +1,15 @@
 import renderToString from 'preact-render-to-string'
 import { App } from './App.jsx'
+import { MetadataContext } from './hooks.jsx'
 
 export function render(url) {
-    return renderToString(<App url={url} />)
+    const metadata = {}
+
+    const html = renderToString(
+        <MetadataContext.Provider value={metadata}>
+            <App url={url} />
+        </MetadataContext.Provider>
+    )
+
+    return { html, metadata }
 }

client/hooks.jsx

@@ -1,6 +1,10 @@
 import { useEffect, useState } from 'preact/hooks'
 
-export const useUser = () => {
+import { createContext } from 'preact'
+
+export const MetadataContext = createContext({})
+
+export const useCurrentUser = onLoaded => {
     const [user, setUser] = useState(null)
 
     const logout = () => {
@@ -11,12 +15,48 @@ export const useUser = () => {
         const res = await fetch(`/api/current-user`, {
             credentials: 'include',
         })
+        const user = await res.json()
+        setUser(user)
 
-        if (res.ok) {
-            const user = await res.json()
-            setUser(user)
-        }
+        console.log(`Current user is`, user)
+
+        onLoaded?.(user)
     }, [])
 
+    useEffect(() => {
+        console.log(user)
+    }, [user])
+
     return [user, logout]
 }
+
+export const useReadResource = (url, initialValue) => {
+    const [value, setValue] = useState(initialValue)
+
+    function refresh() {
+        const controller = new AbortController()
+
+        fetch(url, { signal: controller.signal })
+            .then(res => {
+                if (res.ok) {
+                    return res.json()
+                } else {
+                    return initialValue
+                }
+            })
+            .then(newValue => {
+                setValue(newValue)
+            })
+
+        return controller
+    }
+
+    useEffect(() => {
+        const controller = refresh()
+        return () => {
+            controller.abort()
+        }
+    }, [])
+
+    return [value, refresh]
+}

client/pages/Admin.jsx

@@ -0,0 +1,26 @@
+import { route } from 'preact-router'
+import { useEffect } from 'preact/hooks'
+import { useCurrentUser } from '../hooks.jsx'
+
+export const Admin = ({}) => {
+    const [user] = useCurrentUser(user => {
+        if (!user || user.role !== 'admin') {
+            route('/', true)
+        }
+    })
+
+    return (
+        <main class="admin">
+            <div class="logo">PHC / Problemi</div>
+            <div class="subtitle">
+                {user ? (
+                    <>
+                        Logged in as {user.role} @{user.username}
+                    </>
+                ) : (
+                    <a href="/login">Login</a>
+                )}
+            </div>
+        </main>
+    )
+}

client/pages/Home.jsx

@@ -1,12 +1,11 @@
 import { route } from 'preact-router'
+import { useEffect, useState } from 'preact/hooks'
 
 import { Problem } from '../components/Problem.jsx'
-import { useUser } from '../hooks.jsx'
+import { useReadResource, useCurrentUser } from '../hooks.jsx'
 
 export const HomePage = () => {
-    console.log('rendering homepage')
-
-    const [user, logout] = useUser()
+    const [user, logout] = useCurrentUser()
 
     const handleLogout = async () => {
         await fetch(`/api/logout`, {
@@ -16,13 +15,7 @@ export const HomePage = () => {
         logout()
     }
 
-    const problems = Array.from({ length: 20 }, (_, i) => ({
-        id: i + 1,
-        content:
-            `Lorem ipsum dolor sit amet, consectetur adipisicing elit. Architecto porro commodi cumque ratione sequi reiciendis corrupti a eius praesentium.\n`.repeat(
-                ((i + 2) % 4) + 1
-            ),
-    }))
+    const [problems] = useReadResource('/api/problems', [])
 
     return (
         <main class="home">
@@ -30,7 +23,7 @@ export const HomePage = () => {
             <div class="subtitle">
                 {user ? (
                     <>
-                        Logged in as {user.username} (
+                        Logged in as {user.role} @{user.username} (
                         <span class="link" onClick={handleLogout}>
                             Logout
                         </span>

client/pages/Login.jsx

@@ -31,10 +31,11 @@ export const LoginPage = () => {
                     type="text"
                     value={username}
                     onInput={e => setUsername(e.target.value)}
+                    onKeyDown={e => e.key === 'Enter' && login()}
                 />
 
                 <div class="fill">
-                    <button onClick={() => login()}>Accedi</button>
+                    <button onClick={login}>Accedi</button>
                 </div>
             </div>
         </main>

client/pages/Problem.jsx

@@ -1,23 +1,36 @@
-import { useEffect, useRef, useState } from 'preact/hooks'
+import { useContext, useEffect, useRef, useState } from 'preact/hooks'
 import { Markdown } from '../components/Markdown.jsx'
 import { Problem } from '../components/Problem.jsx'
+import { Solution } from '../components/Solution.jsx'
+import { MetadataContext, useCurrentUser, useReadResource } from '../hooks.jsx'
 
 export const ProblemPage = ({ id }) => {
+    const metadata = useContext(MetadataContext)
+    metadata.title = `Problem ${id}`
+
+    const [user] = useCurrentUser()
+
     const [source, setSource] = useState('')
     const editorRef = useRef()
 
+    const [{ content }] = useReadResource(`/api/problem/${id}`, { content: '' })
+
+    const [solutions] = useReadResource(`/api/solutions?problem=${id}`, [])
+
     const sendSolution = async () => {
-        const res = await fetch(`/api/problem/${id}/new-solution`, {
+        const res = await fetch(`/api/solution`, {
+            method: 'POST',
+            credentials: 'include',
             headers: {
                 'Content-Type': 'application/json',
             },
-            credentials: 'include',
             body: JSON.stringify({
-                source,
+                problemId: id,
+                content: source,
             }),
         })
 
-        console.log(await res.json())
+        location.reload()
     }
 
     useEffect(() => {
@@ -36,39 +49,57 @@ export const ProblemPage = ({ id }) => {
     return (
         <main class="problem">
             <div class="logo">PHC / Problemi</div>
+            {user && (
+                <div class="subtitle">
+                    Logged in as {user.role} @{user.username}
+                </div>
+            )}
             <div class="subtitle">Testo del problema</div>
-            <Problem
-                id={id}
-                content={`Lorem ipsum dolor sit amet, consectetur adipisicing elit. Architecto porro commodi cumque ratione sequi reiciendis corrupti a eius praesentium.\n\n`.repeat(
-                    5
-                )}
-            />
-            <div class="subtitle">Invia una soluzione al problema</div>
-            <div class="solution-editor">
-                <div class="editor">
-                    <h1>Editor</h1>
-                    <textarea
-                        onInput={e => setSource(e.target.value)}
-                        value={source}
-                        cols="60"
-                        ref={editorRef}
-                        placeholder="Scrivi una nuova soluzione..."
-                    ></textarea>
-                </div>
-                <div class="preview">
-                    <h1>Preview</h1>
-                    <div class="preview-content">
-                        {source.trim().length ? (
-                            <Markdown source={source} />
-                        ) : (
-                            <div class="placeholder">Scrivi una nuova soluzione...</div>
-                        )}
+            <Problem id={id} content={content} />
+            {solutions.length > 0 && (
+                <details>
+                    <summary>Soluzioni</summary>
+                    <div class="solution-list">
+                        {solutions.map(s => (
+                            <Solution {...s} />
+                        ))}
                     </div>
+                </details>
+            )}
+            {user ? (
+                <>
+                    <div class="subtitle">Invia una soluzione al problema</div>
+                    <div class="solution-editor">
+                        <div class="editor">
+                            <h1>Editor</h1>
+                            <textarea
+                                onInput={e => setSource(e.target.value)}
+                                value={source}
+                                cols="60"
+                                ref={editorRef}
+                                placeholder="Scrivi una nuova soluzione..."
+                            ></textarea>
+                        </div>
+                        <div class="preview">
+                            <h1>Preview</h1>
+                            <div class="preview-content">
+                                {source.trim().length ? (
+                                    <Markdown source={source} />
+                                ) : (
+                                    <div class="placeholder">Scrivi una nuova soluzione...</div>
+                                )}
+                            </div>
+                        </div>
+                    </div>
+                    <div class="submit-solution">
+                        <button onClick={sendSolution}>Invia Soluzione</button>
+                    </div>
+                </>
+            ) : (
+                <div class="subtitle">
+                    <a href="/login">Accedi</a> per inviare una soluzione
                 </div>
-            </div>
-            <div class="submit-solution">
-                <button onClick={sendSolution}>Invia Soluzione</button>
-            </div>
+            )}
         </main>
     )
 }

client/styles/main.scss

@@ -69,17 +69,17 @@ button {
     border: 1px solid #c8c8c8;
     padding: 0.5rem 2rem;
 
-    box-shadow: -2px 4px 16px 0 #00000010, -2px 4px 4px 0 #00000010;
+    box-shadow: -2px 2px 16px 0 #00000010;
     border-radius: 0.25rem;
 
-    background: linear-gradient(180deg, #f0f0f0, #dfdfdf 20%, #d8d8d8 80%, #c0c0c0);
+    background: linear-gradient(180deg, #f0f0f0, #e8e8e8 20%, #e0e0e0 90%, #cdcdcd);
 
     transition: all 100ms ease-in;
 
     &:hover {
         border: 1px solid #c4c4c4;
-        box-shadow: -2px 4px 20px 4px #00000010, -2px 4px 6px 2px #00000010;
-        background: linear-gradient(180deg, #f8f8f8, #e4e4e4 20%, #e4e4e4 80%, #c8c8c8);
+        box-shadow: -2px 2px 20px 0 #00000010;
+        background: linear-gradient(180deg, #fff, #ededed 20%, #e8e8e8 90%, #c0c0c0);
     }
 }
 
@@ -193,10 +193,28 @@ main {
 main.home {
     .board {
         width: 100%;
+        // min-width: 0;
 
         display: grid;
-        grid-template-columns: repeat(auto-fill, minmax(60ch, 1fr));
+        grid-template-columns: repeat(auto-fit, minmax(auto, 70ch));
         gap: 2rem;
+
+        justify-content: center;
+    }
+}
+
+main.problem {
+    summary {
+        padding: 1rem;
+        text-align: center;
+
+        user-select: none;
+    }
+
+    .solution-list {
+        display: flex;
+        flex-direction: column;
+        gap: 1rem;
     }
 }
 
@@ -207,7 +225,8 @@ main.home {
 main {
     .problem {
         padding: 1rem;
-        // border: 1px solid #ddd;
+
+        max-width: 80ch;
 
         box-shadow: -2px 4px 8px 1px #00000020, -1px 1px 1px 0px #00000010;
         border-radius: 0.5rem;
@@ -217,16 +236,23 @@ main {
         grid-template-rows: auto 1fr;
         gap: 0.5rem;
 
-        max-width: 80ch;
-
         .problem-header {
             display: grid;
             grid-template-columns: auto;
+            gap: 0.25rem;
 
             .problem-title {
                 font-size: 24px;
                 font-weight: 700;
             }
+
+            .problem-author {
+                grid-row: 2;
+
+                font-size: 16px;
+                color: #000000dd;
+                // font-weight: 400;
+            }
         }
 
         .problem-content {
@@ -234,6 +260,30 @@ main {
         }
     }
 
+    .solution {
+        padding: 1rem;
+
+        max-width: 80ch;
+
+        box-shadow: -2px 4px 8px 1px #00000020, -1px 1px 1px 0px #00000010;
+        border-radius: 0.5rem;
+        background: #ffffff;
+
+        display: grid;
+        grid-template-rows: auto 1fr;
+        gap: 0.5rem;
+
+        .solution-header {
+            display: grid;
+            grid-template-columns: auto;
+            gap: 0.25rem;
+        }
+
+        .solution-content {
+            @extend .text-body;
+        }
+    }
+
     .solution-editor {
         display: grid;
         width: 100%;
@@ -291,13 +341,15 @@ main {
     .form {
         min-width: 50ch;
 
+        background: #e0e0e0;
+
         display: grid;
         grid-template-columns: auto 1fr;
 
-        // border: 2px solid #ccc;
+        border: 1px solid #c0c0c0;
         border-radius: 1rem;
 
-        box-shadow: -2px 4px 16px 4px #00000018, -2px 4px 4px 1px #00000018;
+        // box-shadow: -2px 4px 16px 4px #00000018, -2px 4px 4px 1px #00000018;
 
         padding: 1.5rem 2rem 1rem;
         gap: 1rem;

index.html

@@ -20,6 +20,9 @@
 
         <link rel="stylesheet" href="/node_modules/katex/dist/katex.css" />
         <link rel="stylesheet" href="/client/styles/main.scss" />
+
+        <!-- INJECT META TAGS -->
+        <meta property="og:type" content="website" />
     </head>
     <body>
         <!-- SSR OUTLET -->

server.js

@@ -8,7 +8,7 @@ import { createServer as createViteServer } from 'vite'
 
 import { createApiRouter } from './server/routes.js'
 
-const HTML_ROUTES = ['/', '/login', '/problem/:id']
+const HTML_ROUTES = ['/', '/login', '/problem/:id', '/admin']
 
 const config = {
     isDevelopment: process.env.MODE === 'development',
@@ -48,9 +48,27 @@ async function createDevRouter() {
             // Load (to be bundled) entry point for server side rendering
             const { render } = await vite.ssrLoadModule('./client/entry-server.jsx')
 
-            const html = transformedTemplate.replace('<!-- SSR OUTLET -->', render(req.originalUrl))
+            const { html, metadata } = render(req.originalUrl)
 
-            res.send(html)
+            process.stdout.write('[Metadata] ')
+            console.dir(metadata)
+
+            const fullUrl = `${req.protocol}://${req.get('host')}${req.originalUrl}`
+            const metaTagsHtml =
+                '' +
+                (metadata.title
+                    ? `<meta property="og:title" content="${metadata.title}" />\n`
+                    : '') +
+                (metadata.description
+                    ? `<meta property="og:description" content="${metadata.description}" />\n`
+                    : '') +
+                `<meta property="og:url" content="${fullUrl}" />\n`
+
+            res.send(
+                transformedTemplate
+                    .replace('<!-- INJECT META TAGS -->', metaTagsHtml)
+                    .replace('<!-- SSR OUTLET -->', html)
+            )
         } catch (error) {
             vite.ssrFixStacktrace(error)
             next(error)
@@ -74,9 +92,9 @@ async function createProductionRouter() {
             'utf-8'
         )
 
-        const html = transformedTemplate.replace('<!-- SSR OUTLET -->', render(req.originalUrl))
+        const { html, metadata } = render(req.originalUrl)
 
-        res.send(html)
+        res.send(transformedTemplate.replace('<!-- SSR OUTLET -->', html))
     })
 
     return r

server/db/database.js

@@ -1,15 +1,72 @@
+import crypto from 'crypto'
+
 import { readFile, writeFile, access, constants } from 'fs/promises'
 
-export function createDatabase(path, initialValue) {
-    return { path, initialValue }
+function once(fn, message) {
+    let flag = false
+
+    return (...args) => {
+        if (flag) {
+            throw new Error(message ?? `cannot run more than once`)
+        }
+        flag = true
+        return fn(...args)
+    }
 }
 
-async function withDatabase({ path, initialValue }, fn) {
+function createMutex() {
+    let locked = false
+    const waiters = []
+
+    const unlock = () => {
+        if (waiters.length > 0) {
+            console.log(`[Mutex] Passing lock to next in queue (of size ${waiters.length})`)
+            const resolve = waiters.shift()
+            resolve(once(unlock, `lock already released`))
+        } else {
+            locked = false
+            console.log(`[Mutex] Releasing the lock`)
+        }
+    }
+
+    const lock = () => {
+        if (locked) {
+            console.log(`[Mutex] Putting into queue`)
+            return new Promise(resolve => {
+                waiters.push(resolve)
+            })
+        } else {
+            console.log(`[Mutex] Acquiring the lock`)
+            locked = true
+            return once(unlock, `lock already released`)
+        }
+    }
+
+    return { lock }
+}
+
+// l = createLock()
+// unlock1 = await l.lock() // immediate
+//                                          unlock2 = await l.lock() // hangs...
+// unlock1()                                // l2 restarts...
+//                                          unlock2() // no waiters so noop
+
+export function createDatabase(path, initialValue) {
+    return {
+        path,
+        initialValue,
+        mu: createMutex(),
+    }
+}
+
+async function withDatabase({ path, initialValue, mu }, fn) {
+    const unlock = await mu.lock()
+
     try {
         await access(path, constants.R_OK)
     } catch (e) {
         console.log(`[Database] Creating empty database into "${path}"`)
-        await writeFile(path, JSON.stringify(initialValue, null, 2))
+        await writeFile(path, JSON.stringify(initialValue, null, 4))
     }
 
     console.log(`[Database] Loading database from "${path}"`)
@@ -18,40 +75,83 @@ async function withDatabase({ path, initialValue }, fn) {
     const result = await fn(state)
 
     console.log(`[Database] Saving database to "${path}"`)
-    await writeFile(path, JSON.stringify(state, null, 2))
+    await writeFile(path, JSON.stringify(state, null, 4))
+
+    unlock()
 
     return result
 }
 
-function createTable(tableName) {
-    return {
-        create() {},
-        get() {},
-        update() {},
-        delete() {},
-    }
-}
-
-export const User = createTable('users')
-export const Problem = createTable('problems')
+export const getUsers = db =>
+    withDatabase(db, state => {
+        return Object.values(state.users)
+    })
 
 export const getUser = (db, id) =>
     withDatabase(db, state => {
-        return state.users[id]
+        return state.users[id] ?? null
     })
 
-export const createUser = (db, { email, username, password }) =>
+// export const createUser = (db, { email, username }) =>
+//     withDatabase(db, state => {
+//         state.users[username] = {
+//             email,
+//             username,
+//         }
+//     })
+
+// export const updateUser = (db, username, { email, password }) =>
+//     withDatabase(db, state => {
+//         state.users[username] = {
+//             email,
+//             password,
+//         }
+//     })
+
+//
+// Problems
+//
+
+export const getProblem = (db, id) =>
     withDatabase(db, state => {
-        state.users[email] = {
-            username,
-            password,
+        return state.problems[id]
+    })
+
+export const getProblems = db =>
+    withDatabase(db, state => {
+        return Object.values(state.problems)
+    })
+
+//
+// Solutions
+//
+
+export const createSolution = (db, { userId, problemId, content }) =>
+    withDatabase(db, state => {
+        const id = crypto.randomBytes(10).toString('hex')
+        state.solutions[id] = {
+            id,
+            userId,
+            problemId,
+            content,
         }
     })
 
-export const updateUser = (db, username, { email, password }) =>
+export const getSolution = (db, id) =>
     withDatabase(db, state => {
-        state.users[username] = {
-            email,
-            password,
-        }
+        return state.solutions[id]
+    })
+
+export const getSolutions = (db, { userId, problemId } = {}) =>
+    withDatabase(db, state => {
+        let solutions = Object.values(state.solutions)
+
+        if (userId) {
+            solutions = solutions.filter(s => s.userId === userId)
+        }
+        if (problemId) {
+            solutions = solutions.filter(s => s.problemId === problemId)
+        }
+
+        return solutions
     })

server/middlewares.js

@@ -1,18 +1,17 @@
 import { Router } from 'express'
 
-import chalk from 'chalk'
-import { toLocalISO } from '../utils/util.js'
-
-export class StatusRouter extends Router {
-    constructor() {
-        super()
-
-        this.get('/', (req, res) => {
-            res.json({ status: 'ok' })
-        })
-    }
+const createRouter = setup => options => {
+    const r = new Router()
+    setup(r, options)
+    return r
 }
 
+export const createStatusRouter = createRouter(r => {
+    r.get('/', (req, res) => {
+        res.json({ url: req.originalUrl, status: 'ok' })
+    })
+})
+
 export class PingRouter extends Router {
     constructor() {
         super()
@@ -28,10 +27,16 @@ export class PingRouter extends Router {
     }
 }
 
+export const INVALID_SESSION = `invalid session token`
+
 export const authMiddleware = getUserForSession => async (req, res, next) => {
     if (req.cookies.sid) {
-        req.user = await getUserForSession(req.cookies.sid)
-        console.log('Request from user: ' + req.user)
+        const user = await getUserForSession(req.cookies.sid)
+        if (user) {
+            req.user = user
+        } else {
+            res.cookie('sid', '', { expires: new Date() })
+        }
     }
 
     next()

server/routes.js

@@ -5,8 +5,16 @@ import cookieParser from 'cookie-parser'
 
 import express from 'express'
 
-import { authMiddleware, PingRouter, StatusRouter } from './middlewares.js'
-import { createDatabase, getUser, updateUser } from './db/database.js'
+import { createStatusRouter, PingRouter } from './middlewares.js'
+import {
+    createDatabase,
+    createSolution,
+    getProblem,
+    getProblems,
+    getSolutions,
+    getUser,
+    getUsers,
+} from './db/database.js'
 import { initialDatabaseValue } from './db/example-data.js'
 
 export async function createApiRouter() {
@@ -24,35 +32,38 @@ export async function createApiRouter() {
 
     const db = createDatabase('./db.local.json', initialDatabaseValue)
 
+    async function getRequestUser(req) {
+        const userId = sessions.getUserForSession(req.cookies.sid)
+        if (!userId) {
+            return null
+        }
+
+        const user = await getUser(db, userId)
+
+        return user
+    }
+
     const r = express.Router()
 
     r.use(bodyParser.json())
     r.use(cookieParser())
 
-    r.use(authMiddleware(sid => sessions.getUserForSession(sid)))
-
-    r.use('/api/status', new StatusRouter())
+    r.use('/api/status', createStatusRouter())
     r.use('/api/ping', new PingRouter())
 
     r.get('/api/current-user', async (req, res) => {
-        const userId = sessions.getUserForSession(req.cookies.sid)
-        if (!userId) {
-            res.cookie('sid', '', { expires: new Date() })
-            res.status(400)
-            res.end('Invalid session token')
+        res.json(await getRequestUser(req))
+    })
+
+    r.post('/api/login', async (req, res) => {
+        const { username } = req.body
+
+        const user = await getUser(db, username)
+        if (!user) {
+            res.sendStatus(403)
             return
         }
 
-        const user = await getUser(db, userId)
-
-        res.json({
-            username: userId,
-            ...user,
-        })
-    })
-
-    r.post('/api/login', (req, res) => {
-        const { username } = req.body
         res.cookie('sid', sessions.createSession(username), { maxAge: 1000 * 60 * 60 * 24 * 7 })
         res.json({ status: 'ok' })
     })
@@ -62,20 +73,83 @@ export async function createApiRouter() {
         res.json({ status: 'ok' })
     })
 
-    r.get('/api/user/:id', async (req, res) => {
-        const user = await getUser(db, req.params.id)
-
-        if (user) {
-            res.json(user)
-        } else {
-            res.sendStatus(404)
+    r.get('/api/users', async (req, res) => {
+        const requestUser = await getRequestUser(req)
+        if (requestUser.role !== 'admin' && requestUser.role !== 'moderator') {
+            res.sendStatus(401)
+            return
         }
+
+        const users = await getUsers(db)
+        res.json(users)
     })
 
-    r.post('/api/user/:id', async (req, res) => {
-        await updateUser(db, req.params.id, req.body)
-        res.sendStatus(200)
+    r.get('/api/problems', async (req, res) => {
+        res.json(await getProblems(db))
     })
 
+    r.get('/api/problem/:id', async (req, res) => {
+        res.json(await getProblem(db, req.params.id))
+    })
+
+    r.get('/api/solutions', async (req, res) => {
+        let queryUserId = req.query.user
+        let queryProblemId = req.query.problem
+
+        const requestUser = await getRequestUser(req)
+        if (!requestUser) {
+            res.sendStatus(401)
+            return
+        }
+
+        // if current user is not an administrator then force the user query to current user
+        if (requestUser.role !== 'admin' && requestUser.role !== 'moderator') {
+            queryUserId = requestUser.username
+        }
+
+        res.json(await getSolutions(db, { userId: queryUserId, problemId: queryProblemId }))
+    })
+
+    r.post('/api/solution', async (req, res) => {
+        const user = await getRequestUser(req)
+        if (!user) {
+            res.sendStatus(401)
+            return
+        }
+
+        await createSolution(db, {
+            userId: user.username,
+            problemId: req.body.problemId,
+            content: req.body.content,
+        })
+
+        res.send({ status: 'ok' })
+    })
+
+    r.get('/api/user/:id', async (req, res) => {
+        const requestUser = await getRequestUser(req)
+        if (!requestUser) {
+            res.sendStatus(401)
+            return
+        }
+        if (requestUser.role !== 'admin' && requestUser.role !== 'moderator') {
+            res.sendStatus(401)
+            return
+        }
+
+        const requestedUser = await getUser(db, req.params.id)
+        if (!requestedUser) {
+            res.sendStatus(404)
+            return
+        }
+
+        res.json(requestedUser)
+    })
+
+    // r.post('/api/user/:id', async (req, res) => {
+    //     await updateUser(db, req.params.id, req.body)
+    //     res.sendStatus(200)
+    // })
+
     return r
 }

utils/util.js

@@ -1,9 +1,9 @@
 export function toLocalISO(date) {
-    var tzo = -date.getTimezoneOffset(),
-        dif = tzo >= 0 ? '+' : '-',
-        pad = function (num) {
-            return (num < 10 ? '0' : '') + num
-        }
+    const tzo = -date.getTimezoneOffset()
+    const dif = tzo >= 0 ? '+' : '-'
+    const pad = function (num) {
+        return num.toString().padStart(2, '0')
+    }
 
     return (
         date.getFullYear() +