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helpers.js
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helpers.js
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const getIdFromEmail = function(email, userDB) {
for (const key in userDB) {
if (userDB[key].email === email) {
return key;
}
}
return undefined;
};
// For userID
const generateRandomString = () => {
let string = "";
const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
const charLength = chars.length;
for (let i = 0; i < 6; i++) {
string += chars.charAt(Math.floor(Math.random() * charLength));
}
return string;
};
// Filters urlDatabase to only those with id of current user
const urlsMadeByUser = (userID, urlDatabase) => {
const result = {};
for (key in urlDatabase) {
if (urlDatabase[key].userID === userID) {
result[key] = urlDatabase[key];
}
}
return result;
};
const isLoggedIn = (session, userDB) => {
return Boolean(userDB[session.user_id]);
};
// Tallies array of {visitor, timestamp} objects
// Returns object with visitor as keys and how many times they visited as values
const getVisitSummary = (visits) => {
const visitSummary = {};
for (visit of visits) {
if (!visitSummary[visit.visitor]) {
visitSummary[visit.visitor] = 1;
} else {
visitSummary[visit.visitor]++;
}
}
return visitSummary;
};
const getUniqueVisitors = (visits) => {
return Object.keys(getVisitSummary(visits)).length;
};
const displayError = (res, errorCode, errorMessage, user) => {
return res.status(errorCode).render("error",
{ user, errorCode, errorMessage });
};
// Appends http:// in front of url
const fixUrl = (url) => {
if (!url.startsWith('http://')) {
return `http://${url}`;
}
return url;
};
// Get the most visited shortURLs up to a max number, returned as array of shortURLs
const getMostVisitedUrls = (max, urlDB) => {
// Make array of [shortURl, noOfVisitors] for sorting url objs
let visitTally = [];
for (url in urlDB) {
visitTally.push([url, urlDB[url].visits.length]);
}
// Sort by noOfVisitors in descending order then get rid of noOfVisitors to leave
// only the shortURLs array sorted by visits
visitTally.sort((a, b) => b[1] - a[1]);
const mostVisited = visitTally.map(x => x[0]);
return mostVisited.slice(0, max);
};
module.exports = {
getIdFromEmail,
generateRandomString,
urlsMadeByUser,
isLoggedIn,
getVisitSummary,
getUniqueVisitors,
displayError,
fixUrl,
getMostVisitedUrls
};