closer to user login/register

node/package.json

@@ -8,9 +8,10 @@
   "license": "MIT",
   "devDependencies": {
     "pm2": "^4.5.5"
-    },
+  },
   "dependencies": {
     "express": "^4.17.1",
+    "nanoid": "^3.1.22",
     "pg": "^8.5.1"
   }
 }

node/server.js

@@ -1,4 +1,5 @@
 const express = require('express');
+const {nanoid} = require('nanoid');
 
 const { Pool } = require('pg');
 const db = new Pool({
@@ -16,6 +17,7 @@ const port = 80;
 db.query("CREATE TABLE IF NOT EXISTS bin (id VARCHAR PRIMARY KEY);"
       + "CREATE TABLE IF NOT EXISTS note (id VARCHAR PRIMARY KEY, text TEXT, modified TIMESTAMPTZ);"
       + "CREATE TABLE IF NOT EXISTS bin_note (bin_id VARCHAR REFERENCES bin (id), note_id VARCHAR REFERENCES note (id), PRIMARY KEY (bin_id, note_id));"
+      + "CREATE TABLE IF NOT EXISTS user_ (id VARCHAR PRIMARY KEY, username TEXT, password TEXT);" // table 'user' is already taken
       );
 
 
@@ -81,6 +83,38 @@ router.post('/save', (req, res)=>{
   // {status: 'ok'}
   });
 
+const login_check_stmt = 
+          "SELECT id, password FROM user_ AS u"
+        +" WHERE u.username = $1";
+const register_stmt = 
+          "INSERT INTO user_ (id, username, password) VALUES ($1, $2, $3)";
+router.post('/login', (req, res)=>{
+  const {username, password_from_client} = req.body;
+  db.query(login_check_stmt, [username])
+    .then(result=>{
+      // if there is such a username:
+      if(result.rows.length > 0){
+        const row = result.rows[0];
+        const id=row.id, password_from_db=row.password;
+        // if the passwords match:
+        if(password_from_client === password_from_db){
+          res.json({success:true, user:{id, username}, session_id:nanoid()});
+          }
+        else{
+          res.json({success: false});
+          }
+        }
+      // if no such user exists:
+      else{
+        const id = nanoid();
+        db.query(register_stmt, [id, username, password_from_client])
+          .then(r=>{
+            res.json({success: true, user:{id, username}, session_id:nanoid()});
+            });
+        }
+      });
+  });
+
 app.use('/', express.json(), router);
 
 

node/yarn.lock

@@ -966,6 +966,11 @@ mute-stream@~0.0.4:
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.8.tgz#1630c42b2251ff81e2a283de96a5497ea92e5e0d"
   integrity sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA==
 
+nanoid@^3.1.22:
+  version "3.1.22"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.22.tgz#b35f8fb7d151990a8aebd5aa5015c03cf726f844"
+  integrity sha512-/2ZUaJX2ANuLtTvqTlgqBQNJoQO398KyJgZloL0PZkC0dpysjncRUPsFe3DUPzz/y3h+u7C46np8RMuvF3jsSQ==
+
 needle@2.4.0:
   version "2.4.0"
   resolved "https://registry.yarnpkg.com/needle/-/needle-2.4.0.tgz#6833e74975c444642590e15a750288c5f939b57c"