CovidTracer HackTheCrisis Sweden

Screenshots

Hackathon Android APK build 0.1.0 (Debug)

Here is a link to the .apk build for the hackathon that you can install on your Android device. https://firebasestorage.googleapis.com/v0/b/covidtracer-7a0f6.appspot.com/o/CovidTracer%2FApp%20builds%2Fapp-debug-0.1.0.apk?alt=media&token=4889cab0-f1e7-4656-aff9-c5656ca911c0

Video

Here is a short video demonstration of the Hackathon build when the health status of one user has been modified: https://firebasestorage.googleapis.com/v0/b/covidtracer-7a0f6.appspot.com/o/CovidTracer%2FVideo%2FTwo%20devices%20demonstration.MOV?alt=media&token=1c5b4a07-90ab-48c9-ad65-00d797cc1a2e

How it works

After you sign in, you get an OTP token generated using Firebase Phone Auth. After you login, the application starts a background service that constantly publishes and receives the Firestore Database UIDs, by using the Nearby Messages API from Google. When two devices are in close proximity (approximately 4-5m for Bluetooth + sonar) their meetup is registered in Firestore.

In the logged in screen, you can choose your current health status and press the button. This updates your health status in the database. Using Firestore Cloud Messages, there is a JavaScript function that triggers when this update happens and sends a push notification to the users that you have interacted with.

Frontend Configuration (Android App)

Follow the instructions for setting up your Google maps SDK for Android here: https://developers.google.com/maps/documentation/android-sdk/start

Follow the instructions for interacting with the Google Nearby Messages API: https://developers.google.com/nearby/messages/android/get-started

Create or update your local gradle.properties file with:
The API_KEY for the Nearby Messages API (API_KEY=apikeyexample)
The MAPS_API_KEY for the Google maps SDK for Android (MAPS_API_KEY=mapsapikeyexample).

Backend Configuration (Firestore / Functions / Authentication)

Follow the installation guide for Firestore
https://firebase.google.com/docs/firestore/quickstart

Set up Firebase Functions
https://firebase.google.com/docs/functions/get-started

Once you complete the Firebase Functions setup your can navigate to ./firestore/functions and run npm install or yarn to install the node dependencies. Then navigate back to ./firestore and run firebase deploy --only functions. A push notification is set up in -> ./firestore/functions/index.js which can be configured to send data from one device to another using Firestore Database UIDs.

Components

• Android codebase in Java
• Nearby Messages API (contact tracing)
• Firestore (database)
• Firebase Functions (serverless code)
• Firebase Authentication (authenticate requests)

Other info

• Developed with Android Studio verion -> Android 3.6.2

JSON schema for Firebase

2 tabels:

• users

  "users": {
      "user_id1" : {
          "phone" :
      }
      "user_id2" : {
          "phone" :
      }
  }
  

• users meetings

  "users_meetings" : {
      "user_id1" : {
          "meetings" : {
              "user_id_met1" : {
                  "found_timestamp" : ...
                  "lost_timestamp" : ...
                  "status" : ...
              }
              "user_id_met2" : {
                  "found_timestamp" : ...
                  "lost_timestamp" : ...
                  "status" : ...
              }
          }
      }
      "user_id2" : {
          "meetings" : {
              "user_id_met1" : {
                  "found_timestamp" : ...
                  "lost_timestamp" : ...
                  "status" : ...
              }
              "user_id_met2" : {
                  "found_timestamp" : ...
                  "lost_timestamp" : ...
                  "status" : ...
              }
          }
      }
  }
  

Fork of contact tracing project

Project based on Alexander Drumeterez's covidtracer https://github.com/alexandrumeterez/covidtracer