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September 14, 2020 20:03
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Express 7 - POST, PUT en détails
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// dotenv loads parameters (port and database config) from .env | |
require("dotenv").config(); | |
const express = require("express"); | |
const bodyParser = require("body-parser"); | |
const { check, validationResult } = require("express-validator"); | |
const connection = require("./db"); | |
const app = express(); | |
app.use(bodyParser.json()); | |
app.use(bodyParser.urlencoded({ extended: false })); | |
// respond to requests on `/api/users` | |
app.get("/api/users", (req, res) => { | |
// send an SQL query to get all users | |
connection.query("SELECT * FROM user", (err, results) => { | |
if (err) { | |
// If an error has occurred, then the client is informed of the error | |
res.status(500).json({ | |
error: err.message, | |
sql: err.sql, | |
}); | |
} else { | |
// If everything went well, we send the result of the SQL query as JSON | |
res.json(results); | |
} | |
}); | |
}); | |
const userValidationMiddlewares = [ | |
// email must be valid | |
check("email").isEmail(), | |
// password must be at least 8 chars long | |
check("password").isLength({ min: 8 }), | |
// let's assume a name should be 2 chars long | |
check("name").isLength({ min: 2 }), | |
]; | |
app.post("/api/users", userValidationMiddlewares, (req, res) => { | |
const errors = validationResult(req); | |
if (!errors.isEmpty()) { | |
return res.status(422).json({ errors: errors.array() }); | |
} | |
// send an SQL query to get all users | |
return connection.query( | |
"INSERT INTO user SET ?", | |
req.body, | |
(err, results) => { | |
if (err) { | |
// If an error has occurred, then the client is informed of the error | |
return res.status(500).json({ | |
error: err.message, | |
sql: err.sql, | |
}); | |
} | |
// We use the insertId attribute of results to build the WHERE clause | |
return connection.query( | |
"SELECT * FROM user WHERE id = ?", | |
results.insertId, | |
(err2, records) => { | |
if (err2) { | |
return res.status(500).json({ | |
error: err2.message, | |
sql: err2.sql, | |
}); | |
} | |
// If all went well, records is an array, from which we use the 1st item | |
const insertedUser = records[0]; | |
// Extract all the fields *but* password as a new object (user) | |
const { password, ...user } = insertedUser; | |
// Get the host + port (localhost:3000) from the request headers | |
const host = req.get("host"); | |
// Compute the full location, e.g. http://localhost:3000/api/users/132 | |
// This will help the client know where the new resource can be found! | |
const location = `http://${host}${req.url}/${user.id}`; | |
return res.status(201).set("Location", location).json(user); | |
} | |
); | |
} | |
); | |
}); | |
app.put("/api/users/:id", userValidationMiddlewares, (req, res) => { | |
const errors = validationResult(req); | |
const idUser = req.params.id; | |
if (!errors.isEmpty()) { | |
return res.status(422).json({ errors: errors.array() }); | |
} | |
return connection.query( | |
"UPDATE user SET ? WHERE id = ?", | |
[req.body, idUser], | |
(err) => { | |
if (err) { | |
console.log(err); | |
// If an error has occurred, then the client is informed of the error | |
return res.status(500).json({ | |
error: err.message, | |
sql: err.sql, | |
}); | |
} | |
// We use idUser to build the WHERE clause | |
return connection.query( | |
"SELECT * FROM user WHERE id = ?", | |
idUser, | |
(err2, records) => { | |
if (err2) { | |
return res.status(500).json({ | |
error: err2.message, | |
sql: err2.sql, | |
}); | |
} | |
// If all went well, records is an array, from which we use the 1st item | |
const insertedUser = records[0]; | |
// Extract all the fields *but* password as a new object (user) | |
const { password, ...user } = insertedUser; | |
// Get the host + port (localhost:3000) from the request headers | |
const host = req.get("host"); | |
// Compute the full location, e.g. http://localhost:3000/api/users/132 | |
// This will help the client know where the new resource can be found! | |
const location = `http://${host}${req.url}/${user.id}`; | |
return res.status(200).set("Location", location).json(user); | |
} | |
); | |
} | |
); | |
}); | |
app.listen(process.env.PORT, (err) => { | |
if (err) { | |
throw new Error("Something bad happened..."); | |
} | |
console.log(`Server is listening on ${process.env.PORT}`); | |
}); |
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