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server.js
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server.js
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const express = require('express');
const app = express();
const path = require('path');
const data_file = './data.json'
// Parse URL-encoded bodies (as sent by HTML forms)
app.use(express.urlencoded({
extended: true
}))
app.use(express.json());
app.use(express.static(path.join(__dirname, 'build')));
app.get('/', (req, res) => {
res.sendFile(path.join(__dirname, 'build', 'index.html'));
});
app.get('/dictionaryList', async (req, res) => {
if (Object.keys(req.query).length === 0 || req.query.dictionary === '' || req.query.dictionary === undefined)
res.json([]);
else
res.json(await getDictionaryData(req.query.dictionary))
})
app.get('/activities', async (req, res) => {
if (Object.keys(req.query).length === 0 || req.query.room === '' || req.query.room === undefined)
res.json([])
else
res.json(await getRoomActivities(req.query.room));
})
app.get('/activityDetail', async (req, res) => {
if (Object.keys(req.query).length === 0 || req.query.room === '' || req.query.room === undefined || req.query.slot === '' || req.query.slot === undefined || req.query.day === '' || req.query.day === undefined)
res.json([])
else
res.json(await getActivityDetail(req.query.room, req.query.slot, req.query.day));
})
app.post('/removeDictionaryEntry', (req, res) => {
if (Object.keys(req.body).length === 0 || req.body.dictionary === '' || req.body.dictionary === undefined || req.body.entry === '' || req.body.entry === undefined)
res.json("Missing paramters")
else
res.json(removeDictionaryEntry(req.body.dictionary, req.body.entry));
})
app.post('/editDictionaryEntry', (req, res) => {
if (Object.keys(req.body).length === 0 || req.body.dictionary === '' || req.body.dictionary === undefined || req.body.entry === '' || req.body.entry === undefined || req.body.newEntry === '' || req.body.newEntry === undefined)
res.json("Missing paramters")
else
res.json(editDictionaryEntry(req.body.dictionary, req.body.entry, req.body.newEntry));
})
app.post('/addDictionaryEntry', (req, res) => {
if (Object.keys(req.body).length === 0 || req.body.dictionary === undefined || req.body.newEntry === undefined || req.body.dictionary === '' && req.body.newEntry === '')
res.json("Missing paramters")
else
res.json(addDictionaryEntry(req.body.dictionary, req.body.newEntry));
})
app.post('/saveActivity', async (req, res) => {
if (Object.keys(req.body).length === 0 || req.body.room === undefined || req.body.slot === undefined || req.body.day === undefined || req.body.group === undefined || req.body.class === undefined || req.body.teacher === undefined || req.body.room === '' || req.body.slot === undefined || req.body.day === '' || req.body.group === '' || req.body.class === '' || req.body.teacher === '')
res.json("Missing paramters")
else
res.json(saveAcivity(req.body.room, req.body.slot, req.body.day, req.body.group, req.body.class, req.body.teacher));
})
app.post('/unassignEntry', async (req, res) => {
if (Object.keys(req.body).length === 0 || req.body.room === undefined || req.body.slot === undefined || req.body.day === undefined || req.body.room === '' || req.body.slot === undefined || req.body.day === '')
res.json("Missing paramters")
else
res.json(unassignEntry(req.body.room, req.body.slot, req.body.day));
})
async function getDictionaryData(dictionary) {
const fs = require('fs').promises;
return await fs.readFile(data_file, 'utf8')
.then(x => JSON.parse(x)[dictionary] || [])
.catch(e => console.log(e))
}
async function getRoomActivities(roomName) {
const fs = require('fs').promises;
return await fs.readFile(data_file, 'utf8')
.then(x => JSON.parse(x)["activities"].filter(item => item.room.indexOf(roomName) > -1) || [])
.catch(e => console.log(e))
}
async function getActivities() {
const fs = require('fs').promises;
return await fs.readFile(data_file, 'utf8')
.then(x => JSON.parse(x)["activities"])
.catch(e => console.log(e))
}
async function getActivityDetail(room, slot, day) {
const act = await getActivities();
for (const item of act) {
if (item.room === room && item.day === day && item.slot == slot) {
return item;
}
}
}
async function saveAcivity(room, slot, day, group, clas, teacher) {
var data = await getJsonData();
for (const item of data["activities"]) {
if (item.room === room && item.day === day && item.slot == slot) {
var index = data["activities"].indexOf(item);
data["activities"][index].group = group;
data["activities"][index].class = clas;
data["activities"][index].teacher = teacher;
serializeData(data);
return;
}
}
var item = {
"class": clas,
"day": day,
"group": group,
"room": room,
"slot": parseInt(slot),
"teacher": teacher
};
data["activities"].push(item);
checkDataCorrectness(data, room, slot, day, group, teacher);
serializeData(data);
}
function checkDataCorrectness(data, room, slot, day, group, teacher) {
for (const item of data["activities"]) {
if (item.room !== room && item.day === day && item.slot == slot) {
if (item.group === group || item.teacher === teacher) {
var index = data["activities"].indexOf(item);
data["activities"].splice(index, 1);
}
}
}
}
async function unassignEntry(room, slot, day) {
var data = await getJsonData();
for (const item of data["activities"]) {
if (item.room === room && item.day === day && item.slot == slot) {
var index = data["activities"].indexOf(item);
data["activities"].splice(index, 1);
break;
}
}
serializeData(data)
}
// Removing entry of the given dictionary.
async function removeDictionaryEntry(dictionary, entry) {
var data = await getJsonData();
console.log("Edit dictionary entry", dictionary, entry);
var index = data[dictionary].indexOf(entry);
if (index !== -1)
data[dictionary].splice(index, 1);
// Removal of dictionary entry results in removal of connected activities.
var value = dictionary.slice(0, -1); // Removing last character of dictionary name to make it singular.
if (dictionary === "classes") // Special case for "classes" dictionary, there is a need to remove last two characters to make it singular.
value = value.slice(0, -1);
for (const item of data["activities"]) {
if (item[value] === entry) {
data["activities"].splice(data["activities"].indexOf(item), 1);
}
}
serializeData(data);
}
async function editDictionaryEntry(dictionary, entry, newEntry) {
console.log("Edit dictionary entry", dictionary, entry, newEntry);
var data = await getJsonData();
var index = data[dictionary].indexOf(entry);
if (index !== -1)
data[dictionary][index] = newEntry;
// Removal of dictionary entry results in removal of connected activities.
var value = dictionary.slice(0, -1); // Removing last character of dictionary name.
if (dictionary === "classes")
value = dictionary.slice(0, -1); // Removing last character of dictionary name.
for (const item of data["activities"]) {
if (item[value] === entry)
item[value] = newEntry
}
serializeData(data);
}
async function addDictionaryEntry(dictionary, newEntry) {
var data = await getJsonData();
var index = data[dictionary].indexOf(newEntry);
if (index === -1) { // Checking if such entry already exists
data[dictionary].push(newEntry);
serializeData(data);
}
}
async function getJsonData() {
const fs = require('fs').promises;
return await fs.readFile(data_file, 'utf8')
.then(x => JSON.parse(x) || [])
.catch(e => console.log(e))
}
function serializeData(data) {
const fs = require('fs').promises;
const jsonContent = JSON.stringify(data);
fs.writeFile("./data.json", jsonContent, 'utf8', function (err) {
if (err)
return console.log(err);
});
}
app.listen(5000, () => {
console.log("server started on port 5000");
});