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dienstgeber.js
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var fs = require('fs');
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.json());
const settings = {
port: process.env.PORT || 3000,
database: './database.json'
};
app.use(function(err, req, res, next){
console.log(err.stack);
res.end(err.status + ' ' + err.messages);
});
app.use(function(req, res, next){
console.log('Time ' + Date.now() + ' | Request-Path: ' + req.path);
next();
});
/* User Methoden */
// GET /users
app.get('/users', function(req, res){
fs.readFile(settings.database, function(err, data){
if(err){
console.log(err);
res.status(500).send("database error")
}
var user = JSON.parse(data);
res.status(200).send(user.users);
});
});
// POST /users
app.post('/users', function(req, res){
fs.readFile(settings.database, function(err, data){
var user = JSON.parse(data);
var max_index = 0;
var current_i = user.users.length;
// id of the last user is inserted into max_index
for (var i = 0; i < user.users.length; i++){
if (user.users[i].id > max_index){
max_index = user.users[i].id;
}
}
// Check if username is already assigned. Print an error or add an new user
for (var i = 0; i < user.users.length; i++){
if (user.users[i].username == req.body.username){
current_i = i;
}
}
if (current_i < user.users.length){
res.status(409).send("Username not available");
} else {
if (req.body.firstname == null ||
req.body.lastname == null ||
req.body.username == null ||
req.body.address == null ) {
return res.status(406).send("Please stick to the form (firstname,lastname,username,address)");
}
user.users.push({
"id": ++max_index,
"firstname": req.body.firstname,
"lastname": req.body.lastname,
"username": req.body.username,
"address": req.body.address,
"latitude": req.body.latitude,
"longitude": req.body.longitude,
"own_offers": []
});
fs.writeFile(settings.database, JSON.stringify(user, null, 2));
res.write("User sucessfully created");
res.status(201);
res.end();
}
});
});
// GET /users/:userID
app.get('/users/:userID', function(req,res){
fs.readFile(settings.database, function(err, data){
var user = JSON.parse(data);
var current_i = user.users.length;
//Find the position of the searched user and save it in current_i
for (var i = 0; i < user.users.length; i++ ) {
if (user.users[i].id == req.params.userID) {
current_i = i;
}
}
// if current_i is already the same like number of the users, there are no user found. is current_i not the same, print the user
if (current_i < user.users.length) {
res.status(200).send(user.users[current_i]);
} else {
res.status(404).send("User not found");
}
});
});
// PUT /users/:userID
app.put('/users/:userID', function(req, res) {
fs.readFile(settings.database, function(err, data) {
var user = JSON.parse(data);
if (req.body.firstname == null || req.body.lastname == null || req.body.address == null ){
return res.status(406).send("Please stick to the form (firstname,lastname,address)");
}
//find the searched user and edit his attribute
for (var i = 0; i < user.users.length; i++ ) {
if (user.users[i].id == req.params.userID) {
user.users[i].firstname = req.body.firstname;
user.users[i].lastname = req.body.lastname;
user.users[i].address = req.body.address;
user.users[i].longitude = req.body.longitude;
user.users[i].latitude = req.body.latitude;
fs.writeFile(settings.database, JSON.stringify(user, null, 2));
return res.status(200).send("User successfully edited");
}
}
res.status(404).send("User doesn't exist");
});
});
// DELETE /users/:userID
app.delete('/users/:userID', function(req, res) {
fs.readFile(settings.database, function(err, data) {
var user = JSON.parse(data);
var current_i = user.users.length;
// Find the position of the searched user and save it in current_i
for (var i = 0; i < user.users.length; i++ ) {
if (user.users[i].id == req.params.userID) {
current_i = i;
}
}
// if current_i is already the same like number of the users, there are no user found. is current_i not the same, delete the user
if (current_i < user.users.length) {
user.users.splice(current_i,1);
fs.writeFile(settings.database, JSON.stringify(user, null, 2));
res.status(204).send("User successfully deleted");
} else {
res.status(404).send("User not found ");
}
});
});
/* Offer Methoden */
// GET /offers
app.get('/offers', function(req, res) {
fs.readFile(settings.database, function(err, data) {
var offers = JSON.parse(data);
if(err){
console.log(err);
res.status(500).send("database error")
}
res.status(200).send(offers.offers);
});
});
// POST /offers
app.post('/offers', bodyParser.json(), function(req, res) {
fs.readFile(settings.database, function(err, data) {
var offer = JSON.parse(data);
var max_index = 0;
// id of the last offer is inserted into max_index
for (var i = 0; i < offer.offers.length; i++) {
if (offer.offers[i].id > max_index){
max_index = offer.offers[i].id;
}
}
if (req.body.name == null ||
req.body.description == null ||
req.body.category == null ||
req.body.createdByID == null ) {
return res.status(406).send("Please stick to the form (name,description,category,createdByID)");
}
//add a new offer
offer.offers.push( {
"id": ++max_index,
"name": req.body.name,
"description": req.body.description,
"category" : req.body.category,
"createdByID" : req.body.createdByID,
"creatorUri" : req.body.creatorUri,
"available" : true,
"currentOwner": null,
"latitude": null,
"longitude": null
});
for (var x = 0; x < offer.users.length; x++) {
if (offer.users[x].id == req.body.createdByID) {
offer.users[x].own_offers.push({
"offerID": max_index,
"offer_uri": 'http://localhost:3001/offers/' + max_index
});
}
}
fs.writeFile(settings.database, JSON.stringify(offer, null, 2));
res.write("Offer sucessfully created");
res.status(201);
res.end();
});
});
// GET /:offerID
app.get('/offers/:offerID', function(req,res) {
fs.readFile(settings.database, function(err, data) {
var offer = JSON.parse(data);
var current_i = offer.offers.length;
//Find the position of the searched offer and save it in current_i
for (var i = 0; i < offer.offers.length; i++ ) {
if (offer.offers[i].id == req.params.offerID) {
current_i = i;
}
}
//if current_i is already the same like number of the offers, there are no offer found. is current_i not the same, print the offer
if (current_i < offer.offers.length) {
res.status(200).send(offer.offers[current_i]);
} else {
res.status(404).send("Offer not found");
}
});
});
// PUT /:offerID
app.put('/offers/:offerID', function(req, res) {
fs.readFile(settings.database, function(err, data) {
var offer = JSON.parse(data);
if (req.body.name == null || req.body.description == null || req.body.category == null ) {
return res.status(406).send("Please stick to the form (name,description,category)");
}
//find the searched user and edit his attribute
for (var i = 0; i < offer.offers.length; i++ ) {
if (offer.offers[i].id == req.params.offerID) {
offer.offers[i].name = req.body.name;
offer.offers[i].description = req.body.description;
offer.offers[i].category = req.body.category;
if (req.body.currentOwner == null) {
offer.offers[i].currentOwner = null;
} else {
offer.offers[i].currentOwner = req.body.currentOwner;
}
for (var x = 0; x < offer.users.length; x++) {
if (offer.users[x].id == req.body.currentOwner) {
offer.offers[i].latitude = offer.users[x].latitude;
offer.offers[i].longitude = offer.users[x].longitude;
}
}
if (offer.offers[i].currentOwner != null ) {
offer.offers[i].status = false;
}
fs.writeFile(settings.database, JSON.stringify(offer, null, 2));
return res.status(200).send("Offer successfully edited");
}
}
res.status(404).send("This offer doesn't exist");
});
});
// DELETE /offers/:offerID
app.delete('/offers/:offerID', function(req, res) {
fs.readFile(settings.database, function(err, data) {
var offer = JSON.parse(data);
var current_i ;
//Find the position of the searched offer and save it in current_i
for (var i = 0; i < offer.offers.length; i++ ) {
if (offer.offers[i].id == req.params.offerID) {
current_i = i;
}
}
// if current_i is already the same like number of the offers, there are no offer found. is current_i not the same, delete the offer
if (current_i < offer.offers.length){
offer.offers.splice(current_i, 1);
fs.writeFile(settings.database, JSON.stringify(offer, null, 2));
res.status(204).send("Offer successfully deleted");
} else {
res.status(404).send("Offer not found");
}
});
});
app.listen(settings.port, function(){
console.log("Dienstgeber läuft auf Port " + settings.port + ".");
});