carp_firebase_backend 0.2.0 carp_firebase_backend: ^0.2.0 copied to clipboard
Firebase data backend for CARP mobile sensing in Flutter. Supports uploading json files to Google Firebase as either (i) zipped filed to Firebase Storage or as (ii) plain json to Firebase Database.
CARP Firebase Data Backend #
A Flutter plugin for uploading data from the CARP Mobile Sensing Framework to a Google Firebase data backend.
For Flutter plugins for other CARP products, see CARP Mobile Sensing in Flutter.
This package can upload sending data to Goggle Firebase in two ways.
Google Firebase Storage #
By using the Google Firebase Storage endpoint, CARP sensing data are uploaded as raw or zipped JSON file, generated using the
FileDataManager
in carp_mobile_sensing
.
In Firebase, files with sensed data is stored in the path
specified in the FirebaseStorageDataEndPoint
plus subfolders for each study and device.
The path on Firebase hence follow this pattern:
/<path>/<study_id>/<device_id>/
Google Firebase Database #
By using the Google Firebase Database endpoint, CARP sensing data are uploaded as raw JSON data points, using Firebase as a
DataManager
in carp_mobile_sensing
.
In Firebase, data json objects are stores in the collection
specified in the FirebaseDatabaseDataManager
JSON objects will be stored in collections named
/<collection>/<study_id>/<device_id>/upload/<data_type>
relative to this path. For example, if collection
is carp_data
, study_id
is 1234
and device_id
is R16NW
,
location data will be stored as documents in this collection:
carp_data/1234/R16NW/upload/location
.
Setting up support for Google Firebase (GF) #
For Firebase to work with your Flutter app, configuration of both GF and the Flutter app has to be done. Please follow the step below in details, since the level of debugging/error messages are quite limited when setting this up. If you are new to Firebase, then please start by reading the extensive Firebase documentation first.
In Google Firebase #
-
Create a Firebase project with a cloud storage
-
Add Firebase to your Flutter project by following the description. Note that you need to add support for both the Android and iOS version of the Flutter app.
-
Download the configuration file named
google-services.json
and make sure to put in in your Android app module root directory, i.e a folder like<appname>/android/app/
-
Add support for the Google Services Gradle plugin to read the
google-services.json
file that was generated by Firebase.- in your IDE, open
android/app/build.gradle
, and add the following line as the last line in the file:
apply plugin: 'com.google.gms.google-services'
- In
android/build.gradle
, inside thebuildscript
tag, add a new dependency:
dependencies { // ... classpath 'com.google.gms:google-services:4.0.1' // new }
- note the version of this SDK may chance - see Add Firebase to Your Android Project
- in your IDE, open
-
Configure authentication
carp_firebase_backend
supports two types of authentication:- username/password authentication
- Google Sign-In on Android
-
Add users that can upload data e.g. via the console
-
Set up your storage security rules as shown below.
# Default access rule
service firebase.storage {
match /b/{bucket}/o {
match /{allPaths=**} {
allow read, write: if request.auth != null;
}
}
}
- for testing/debugging purposes, you may remove authentication by the authentication rule below (but should be removed in production)
# No authentication rule
service firebase.storage {
match /b/{bucket}/o {
match /{allPaths=**} {
allow read, write;
}
}
}
Your Flutter app should now be connected to Firebase.
In your Flutter App #
In Flutter, the carp_firebase_backend
plugin is used to upload data from carp_mobile_sensing
to a Firebase endpoint.
Add the carp_firebase_backend
plugin to the pubspec.yaml
file.
dependencies:
flutter:
sdk: flutter
carp_firebase_backend: ^0.2.0 # support for uploading CARP data to Firebase
Run flutter packages get
. For more information on managing packages and plugins,
see Using Packages.
Using the Plugin #
Upload of files to Firebase Storage uses the FirebaseStorageDataManager
and
upload of json objects to Firebase Database uses FirebaseDatabaseDataManager
.
Using the library takes three steps.
1. Register the Data Managers #
First you should register the data manager you want to use (or both) in the DataManagerRegistry
.
DataManagerRegistry.register(DataEndPointType.FIREBASE_STORAGE, new FirebaseStorageDataManager());
DataManagerRegistry.register(DataEndPointType.FIREBASE_DATABASE, new FirebaseDatabaseDataManager());
2. Specify Access Details to the Firebase App #
Both data managers uses a FirebaseEndPoint
object to handle access to Firebase.
In this object, Firebase endpoint configuration keys are stored as well as authentication details.
All of the Firebase configuration keys can be found in the Projects Settings in the Firebase Console.
Remember to register your app in Firebase, as described above.
The firebaseAuthenticationMethod
key specify the authentication method. Currently, only email/password and
Google Sign-In is implemented (even though FireBaseAuthenticationMethods
lists them all (for future use)).
Using email/password as authentication
final FirebaseEndPoint firebaseEndPoint = new FirebaseEndPoint(
name: "Flutter Sensing Sandbox",
uri: 'gs://flutter-sensing-sandbox.appspot.com',
projectID: 'flutter-sensing-sandbox',
webAPIKey: 'AIzaSyCGy6MeHkiv5XkBtMcMbtgGYOpf6ntNVE4',
gcmSenderID: '201621881872',
androidGoogleAppID: '1:201621881872:android:8e84e7ccfc85e121',
iOSGoogleAppID: '1:159623150305:ios:4a213ef3dbd8997b',
firebaseAuthenticationMethod: FireBaseAuthenticationMethods.PASSWORD,
email: "some_email@dtu.dk",
password: "some_password");
Using Google Sign-In as authentication
final FirebaseEndPoint firebaseEndPoint = new FirebaseEndPoint(
name: "Flutter Sensing Sandbox",
uri: 'gs://flutter-sensing-sandbox.appspot.com',
projectID: 'flutter-sensing-sandbox',
webAPIKey: 'AIzaSyCGy6MeHkiv5XkBtMcMbtgGYOpf6ntNVE4',
gcmSenderID: '201621881872',
androidGoogleAppID: '1:201621881872:android:8e84e7ccfc85e121',
iOSGoogleAppID: '1:159623150305:ios:4a213ef3dbd8997b',
firebaseAuthenticationMethod: FireBaseAuthenticationMethods.GOOGLE);
3. Create the Data Endpoint #
Finally, you create the data endpoint (FirebaseStorageDataEndPoint
or FirebaseDatabaseDataEndPoint
) providing it
with a FirebaseEndPoint
and add it as your Study
data endpoint.
Firebase Storage Endpoint
final FirebaseStorageDataEndPoint storageEndPoint =
new FirebaseStorageDataEndPoint(DataEndPointType.FIREBASE_STORAGE, firebaseEndPoint, 'sensing/data');
storageEndPoint.bufferSize = 1000 * 1000;
storageEndPoint.zip = true;
Study study_1 = new Study("1234", "user_1@dtu.dk", name: "Test study #1");
study_1.dataEndPoint = storageEndPoint;
Note that a FirebaseStorageDataEndPoint
extends the FileDataEndPoint
class and parameters related to
how to create the files can be specified, including bufferSize
, zip
, and encrypt
.
In the example above, the file buffer size is set to 1 MB, which is zipped before upload.
Firebase Database Endpoint
final FirebaseDatabaseDataEndPoint databaseEndPoint =
new FirebaseDatabaseDataEndPoint(DataEndPointType.FIREBASE_DATABASE, firebaseEndPoint_2, 'carp_data');
Study study_2 = new Study("5678", "user_2@dtu.dk", name: "Test study #2");
study_2.dataEndPoint = databaseEndPoint;
Features and bugs #
Please file feature requests and bug reports at the issue tracker.
License #
This software is copyright (c) 2018 Copenhagen Center for Health Technology (CACHET) at the Technical University of Denmark (DTU). This software is made available 'as-is' in a MIT license.