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app.js
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/*********** GENERAL SET-UP ************/
const crypto = require("crypto");
const fs = require("fs");
const path = require("path");
const { researchIsSharable, addResearchParticipant, changeSharingPreference, addResearchHash, getResearchHash } = require("./blockchainInterface.js")
const express = require("express");
const app = express();
const mongoose = require("mongoose");
const bcrypt = require("bcryptjs");
const saltRounds = 10;
app.use(express.static("client"));
app.set("view engine", "ejs");
app.use(express.urlencoded({
extended: true
}));
let currentUser = null;
/*********** DATABASE CONNECTION ************/
mongoose.connect("mongodb://localhost:27017/researchSecureDB")
.then(() => console.log("Connected to research secure DB"))
.catch(() => console.log("Connection to research secure DB failed"));
/*********** DATABASE SCHEMA SET-UP ************/
// Defines a schema that will be used for a collection (table) in the database
// User table
const userSchema = new mongoose.Schema({
email: String,
password: String,
occupation: String,
fullName: String,
researchers: [{
type: mongoose.Schema.Types.ObjectId,
ref: "User"
}],
testSubjects: [{
type: mongoose.Schema.Types.ObjectId,
ref: "User"
}],
reviewees: [{
type: mongoose.Schema.Types.ObjectId,
ref: "User"
}],
allResponded: {
type: Boolean,
default: false
},
hasShared: {
type: Boolean,
default: false
}
});
// Research data table
const researchDataSchema = new mongoose.Schema({
researcherEmail: String,
title: String,
responses: [String]
});
// Creates a MongoDB collection (equivalent to table) called "Users" (Mongo automatically changes User to
// Users). Documents in this particular collection will follow the schema of "userSchema" defined above
const User = new mongoose.model("User", userSchema);
const ResearchData = new mongoose.model("ResearchData", researchDataSchema);
/*********** API GET ENDPOINTS ************/
app.get("/", (_, res) => {
res.sendFile(__dirname + "/client/homepage/index.html")
})
app.get("/signin", (_, res) => {
res.sendFile(__dirname + "/client/sign-in/signin.html")
})
app.get("/signup", (_, res) => {
res.sendFile(__dirname + "/client/sign-up/signup.html")
})
app.get("/signup", (_, res) => {
res.sendFile(__dirname + "/client/sign-up/signup.html")
})
app.get("/mainmenu", (_, res) => {
if (currentUser) {
res.render("main-menu", {
occupation: currentUser.occupation
})
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated. Please sign in first.",
route: "/signin"
})
}
})
app.get("/addTestSubject", (req, res) => {
if ((currentUser) && (currentUser.occupation === "Researcher")) {
User.find({ occupation: "Test Subject" }, (err, testers) => {
if (err) {
console.log(err)
res.redirect("/mainmenu")
} else {
res.render("add-test-subject", {
participants: testers
})
}
})
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a researcher.",
route: "/signin"
})
}
})
app.get("/submitResearchQuestions", (_, res) => {
if ((currentUser) && (currentUser.occupation === "Researcher")) {
res.sendFile(__dirname + "/client/submit-research-questions/submit-research-questions.html")
} else {
res.render("failure", {
message: "This page is blocked as you are not authenticated or not a researcher.",
route: "/signin"
})
}
})
app.get("/selectResearcher", async (req, res) => {
if ((currentUser) && (currentUser.occupation === "Test Subject")) {
try {
const userWPopulatedResearchers = await currentUser.populate("researchers")
res.render("select-researcher", {
researcherList: userWPopulatedResearchers.researchers
})
} catch (e) {
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a test subject.",
route: "/signin"
})
}
})
app.get("/logout", (_, res) => {
currentUser = null;
res.render("success", {
message: "You have logged out of your account.",
route: "/"
})
})
app.get("/selectQuestion", async (req, res) => {
if ((currentUser) && (currentUser.occupation === "Researcher")) {
try {
const questions = await ResearchData.find({researcherEmail: currentUser.email})
res.render("select-question", {
questionList: questions
})
} catch (e) {
console.log(e);
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a researcher.",
route: "/signin"
})
}
})
app.get("/downloadData", async (req, res) => {
if ((currentUser) && (currentUser.occupation === "Researcher")) {
console.time("Download Data")
const allowedToShare = await researchIsSharable(currentUser._id.toString());
console.log("This data can be shared: " + allowedToShare);
if ((currentUser.allResponded) && (allowedToShare)) {
ResearchData.find({researcherEmail: currentUser.email}, (err, data) => {
if (err) {
console.log(err);
res.render("failure", {
message: "Something went wrong. Please try again.",
route: "/mainmenu"
})
} else if (data) {
const dataAsJson = JSON.stringify(data);
fs.writeFile("output.json", dataAsJson, err => {
if (err) {
res.render("failure", {
message: "Something went wrong when trying to download the file.",
route: "/mainmenu"
})
}
console.log("File created");
const filePath = path.join(__dirname, "output.json");
const fileStream = fs.createReadStream(filePath);
res.setHeader('Content-Type', 'application/json');
res.setHeader('Content-Disposition', 'attachment; filename=output.json');
fileStream.pipe(res);
res.on("finish", () => {
fs.unlink(filePath, err => {
if (err) {
console.log(err)
}
User.findByIdAndUpdate(currentUser._id, { hasShared: true })
.then(() => {
console.log("File deleted")
console.log("Researcher share status updated")
console.timeEnd("Download Data")
})
.catch(err => {
console.log(err);
})
})
});
})
}
})
} else {
res.render("failure", {
message: "You cannot share the data either because not all participants have responded or some participants do not want their data shared.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a researcher.",
route: "/signin"
})
}
})
app.get("/setSharingPreference", async (req, res) => {
if ((currentUser) && (currentUser.occupation === "Test Subject")) {
try {
const userWPopulatedResearchers = await currentUser.populate("researchers")
res.render("set-sharing-preference", {
researcherList: userWPopulatedResearchers.researchers
})
} catch (e) {
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a test subject.",
route: "/signin"
})
}
})
app.get("/addPeerReviewer", (req, res) => {
if ((currentUser) && (currentUser.occupation === "Researcher")) {
User.find({ occupation: "Peer Reviewer" }, (err, theReviewers) => {
if (err) {
console.log(err);
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
} else {
res.render("add-peer-reviewer", {
reviewers: theReviewers
})
}
})
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a researcher.",
route: "/signin"
})
}
})
app.get("/viewHash", async (req, res) => {
if ((currentUser) && (currentUser.occupation === "Researcher") && (currentUser.allResponded)) {
try {
const storedHash = await getResearchHash(currentUser._id.toString());
const researcherData = await ResearchData.find({ researcherEmail: currentUser.email });
const dataAsJson = JSON.stringify(researcherData);
const calculatedHash = crypto.createHash("sha256").update(dataAsJson).digest("hex");
if (storedHash === calculatedHash) {
res.render("success", {
message: "The stored hash is: " + storedHash + " and the calculated hash is: " + calculatedHash,
route: "/mainmenu"
})
} else {
res.render("failure", {
message: "The hashes do not match. The stored hash is: " + storedHash + " and the calculated hash is: " + calculatedHash,
route: "/mainmenu"
})
}
} catch (e) {
console.log(e);
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "You may not be authenticated. Your test subjects may not have all responded yet as well, thus the hash may not exist yet.",
route: "/mainmenu"
})
}
})
app.get("/verifyDataIntegrity", async (req, res) => {
if ((currentUser) && (currentUser.occupation === "Peer Reviewer")) {
try {
const userWPopulatedReviewees = await currentUser.populate("reviewees")
res.render("verify-data-integrity", {
researcherList: userWPopulatedReviewees.reviewees
})
} catch (e) {
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a peer reviewer.",
route: "/signin"
})
}
})
app.get("/verifyDataPrivacy", async (req, res) => {
if ((currentUser) && (currentUser.occupation === "Peer Reviewer")) {
try {
const userWPopulatedReviewees = await currentUser.populate("reviewees")
res.render("verify-data-privacy", {
researcherList: userWPopulatedReviewees.reviewees
})
} catch (e) {
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a peer reviewer.",
route: "/signin"
})
}
})
/*********** API POST ENDPOINTS ************/
app.post("/addPeerReviewer", async (req, res) => {
const peerReviewers = req.body.reviewers;
try {
if (Array.isArray(peerReviewers)) {
for (let i = 0; i < peerReviewers.length; i++) {
await User.findByIdAndUpdate(peerReviewers[i], { $addToSet: { reviewees: currentUser}})
}
} else {
await User.findByIdAndUpdate(peerReviewers, { $addToSet: { reviewees: currentUser}})
}
res.render("success", {
message: "Peer Reviewers successfully added.",
route: "/mainmenu"
})
} catch (e) {
console.log(e)
res.render("failure", {
message: "Error adding peer reviewers. Please try again.",
route: "/addPeerReviewer"
})
}
})
app.post("/verifyDataIntegrity", async (req, res) => {
console.time("Verify Data Integrity");
if ((currentUser) && (currentUser.occupation === "Peer Reviewer")) {
try {
const researcherId = req.body.selectedResearcher;
const researcherObject = await User.findById(researcherId);
if (!researcherObject.allResponded) {
res.render("failure", {
message: "Unable to view hash. Not all participants have responded to the researcher yet.",
route: "/mainmenu"
})
}
const researcherData = await ResearchData.find({ researcherEmail: researcherObject.email });
const dataAsJson = JSON.stringify(researcherData);
const calculatedHash = crypto.createHash("sha256").update(dataAsJson).digest("hex");
const storedHash = await getResearchHash(researcherObject._id.toString());
if (calculatedHash === storedHash) {
console.timeEnd("Verify Data Integrity");
res.render("success", {
message: "The stored and calculated hashes match. The stored hash is: " + storedHash + " and the calculated hash is: " + calculatedHash,
route: "/mainmenu"
})
} else {
res.render("failure", {
message: "The hashes do not match. The stored hash is: " + storedHash + " and the calculated hash is: " + calculatedHash,
route: "/mainmenu"
})
}
} catch (e) {
console.log(e);
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a peer reviewer.",
route: "/signin"
})
}
})
app.post("/verifyDataPrivacy", async (req, res) => {
console.time("Verify Data Privacy");
if ((currentUser) && (currentUser.occupation === "Peer Reviewer")) {
try {
const researcherId = req.body.selectedResearcher;
const researcherObject = await User.findById(researcherId);
if (!researcherObject.allResponded) {
res.render("failure", {
message: "Unable to view hash. Not all participants have responded to the researcher yet.",
route: "/mainmenu"
})
}
const dataWasShared = researcherObject.hasShared;
const dataWasSharable = researchIsSharable(researcherObject._id.toString());
if ((dataWasShared === dataWasSharable) || (dataWasSharable)) {
console.timeEnd("Verify Data Privacy")
res.render("success", {
message: "Data privacy was respected",
route: "/mainmenu"
})
} else {
res.render("failure", {
message: "The data was shared but this was not authorized by the research participants",
route: "/mainmenu"
})
}
} catch (e) {
console.log(e);
res.render("failure", {
message: "Something went wrong.",
route: "/mainmenu"
})
}
} else {
res.render("failure", {
message: "This page is blocked as you are not yet authenticated or not a peer reviewer.",
route: "/signin"
})
}
})
app.post("/setSharingPreference", async (req, res) => {
try {
console.time("Set Sharing Preference");
const researcherId = req.body.selectedResearcher;
const sharingPreference = req.body.sharingPreference === "true";
console.log("Sharing preference selected is: " + sharingPreference);
const researcherDocument = await User.findById(researcherId);
await changeSharingPreference(researcherDocument._id.toString(), currentUser._id.toString(), sharingPreference);
console.timeEnd("Set Sharing Preference")
res.render("success", {
message: "Your preference has been saved to the blockchain.",
route: "/mainmenu"
})
} catch (e) {
res.render("failure", {
message: "Something went wrong. Please Try Again",
route: "/setSharingPreference"
})
}
})
app.post("/selectQuestion", async (req, res) => {
const questionId = req.body.selectedQuestion;
try {
const questionDoc = await ResearchData.findById(questionId);
res.render("view-question-responses", {
questionDocument: questionDoc
})
} catch (e) {
console.log(e)
res.render("failure", {
message: "Something went wrong. Please try again.",
route: "/selectQuestion"
})
}
})
app.post("/signin", (req, res) => {
const userEmail = req.body.email;
const userPassword = req.body.password;
User.findOne({email: userEmail}, (err, returnedUser) => {
if (err) {
console.log(err);
} else if (returnedUser) {
bcrypt.compare(userPassword, returnedUser.password, (err, isCorrect) => {
if (err) {
res.redirect("/signin");
}
if (isCorrect === true) {
currentUser = returnedUser;
res.redirect("/mainmenu");
} else {
res.render("failure", {
message: "Something went wrong.",
route: "/signin"
})
}
})
} else {
res.render("failure", {
message: "Incorrect email or password.",
route: "/signin"
})
}
})
})
app.post("/signup", (req, res) => {
const userEmail = req.body.email;
const userPassword = req.body.password;
const userFullName = req.body.fullName;
const userOccupation = req.body.occupation;
User.findOne({ email: userEmail }, (err, returnedUser) => {
// Email already exists
if (returnedUser) {
res.render("failure", {
message: "An account with that email already exists. Please use another email.",
route: "/signup"
})
// Email does not exist but error occurred somewhere
} else {
if (err) {
console.log(err);
res.render("failure", {
message: "Something went wrong. Please try again.",
route: "/signup"
})
// No error and email does not exist --> must be a new user
} else {
bcrypt.hash(userPassword, saltRounds, (err, hashedPassword) => {
const newUser = new User({
email: userEmail,
password: hashedPassword,
occupation: userOccupation,
fullName: userFullName,
researchers: [],
testSubjects: [],
reviewees: [],
allResponded: false,
hasShared: false
});
newUser.save()
.then(() => {
User.findOne({ email: userEmail}, (err, currUser) => {
if (err) {
res.render("failure", {
message: "Something went wrong. Please try again.",
route: "/signin"
})
} else if (currUser) {
currentUser = currUser;
res.render("success", {
message: "Account successfully created.",
route: "/mainmenu"
})
} else {
res.render("failure", {
message: "Sign up failed. Please try again.",
route: "/signup"
})
}
})
})
.catch(err => {
console.log(err);
res.render("failure", {
message: "Sign up failed. Please try again.",
route: "/signup"
})
});
})
}
}
});
})
app.post("/submitResearchQuestions", (req, res) => {
Object.keys(req.body).forEach(key => {
const newResearch = new ResearchData({
researcherEmail: currentUser.email,
title: req.body[key],
responses: []
})
newResearch.save()
.then(() => {
console.log("Successfully saved research question");
})
.catch(err => {
console.log(err);
res.render("failure", {
message: "Error submitting questions. Please try again.",
route: "/submitResearchQuestions"
})
})
})
res.render("success", {
message: "Research questions submitted.",
route: "/mainmenu"
})
})
app.post("/addTestSubject", async (req, res) => {
const testers = req.body.participants;
await User.findOneAndUpdate({email: currentUser.email}, { allResponded: false })
try {
if (Array.isArray(testers)) {
for (let i = 0; i < testers.length; i++) {
await User.findOneAndUpdate({email: testers[i]}, { $addToSet: { researchers: currentUser}})
let currentParticipant = await User.findOne({email: testers[i]})
await User.findOneAndUpdate({email: currentUser.email}, { $addToSet: { testSubjects: currentParticipant}})
// Default false sharing preference
await addResearchParticipant(currentUser._id.toString(), currentParticipant._id.toString());
}
} else {
await User.findOneAndUpdate({email: testers}, { $addToSet: { researchers: currentUser}})
let currentParticipant = await User.findOne({email: testers})
await User.findOneAndUpdate({email: currentUser.email}, { $addToSet: { testSubjects: currentParticipant}})
await addResearchParticipant(currentUser._id.toString(), currentParticipant._id.toString());
}
res.render("success", {
message: "Test subjects successfully added.",
route: "/mainmenu"
})
} catch (e) {
console.log(e)
res.render("failure", {
message: "Error adding test subjects. Please try again.",
route: "/addTestSubject"
})
}
})
app.post("/viewResearchQuestions", async (req, res) => {
const researcherEmail = req.body.selectedResearcher;
try {
const questions = await ResearchData.find({researcherEmail: researcherEmail})
res.render("view-research-questions", {
questionsData: questions
})
} catch (e) {
console.log(e)
res.redirect("/selectResearcher")
}
})
app.post("/submitResearchAnswers", async (req, res) => {
const questionIds = Object.keys(req.body);