{ "rules": { ".read": true, ".write": false } }
ROOT - data - value: 99
private class MyValueEventListener implements ValueEventListener { @Override public void onDataChange(DataSnapshot dataSnapshot) { Log.i("********** change", dataSnapshot.getKey() + ": " + dataSnapshot.getValue()); } @Override public void onCancelled(DatabaseError databaseError) { // If we're not expecting an error, report it to your Firebase console FirebaseCrash.report(databaseError.toException()); } }
HashMap map = new HashMap<>(); map.put("value", 100); dataRef.setValue(map);
I/********** change: DataSnapshot { key = data, value = {value=99} } I/********** change: DataSnapshot { key = data, value = {value=100} } W/RepoOperation: setValue at /data failed: DatabaseError: Permission denied I/********** change: DataSnapshot { key = data, value = {value=99} }
private class MyChildEventListener implements ChildEventListener { @Override public void onChildAdded(DataSnapshot dataSnapshot, String s) { Log.i("**********", "childAdded " + dataSnapshot.toString()); } @Override public void onChildChanged(DataSnapshot dataSnapshot, String s) { Log.i("**********", "childChanged " + dataSnapshot.toString()); } @Override public void onChildRemoved(DataSnapshot dataSnapshot) { Log.i("**********", "childRemoved " + dataSnapshot.toString()); } @Override public void onChildMoved(DataSnapshot dataSnapshot, String s) { Log.i("**********", "childMoved " + dataSnapshot.toString()); } @Override public void onCancelled(DatabaseError databaseError) { FirebaseCrash.report(databaseError.toException()); } } DatabaseReference messagesRef = FirebaseDatabase.getInstance().getReference("messages"); messagesRef.addChildEventListener(new MyChildEventListener()); HashMap map = new HashMap<>(); map.put("key", "value"); DatabaseReference newMesssageRef = newMessageRef.push(); newMessageRef.setValue(map);
I/**********: childAdded DataSnapshot { key = -KTfacNOAJt2fCUVtwtj, value = {key=value} } W/RepoOperation: setValue at /messages/-KTfacNOAJt2fCUVtwtj failed: DatabaseError: Permission denied I/**********: childRemoved DataSnapshot { key = -KTfacNOAJt2fCUVtwtj, value = {key=value} }
Task task = messageRef.setValue(map); task.addOnCompleteListener(MainActivity.this, new OnCompleteListener() { @Override public void onComplete(@NonNull Task task) { Log.i("**********", "setValue complete"); if (!task.isSuccessful()) { Log.i("**********", "BUT IT FAILED", task.getException()); FirebaseCrash.log("Error writing to " + ref.toString()); FirebaseCrash.report(task.getException()); } } });
{ "rules": { "chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()" } } } } }
chats//messages
members
userID
$chatID
user_abc
user_xyz
members/user_xyz
"chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()", ".write": "data.parent().child('members').child(auth.uid).exists()" } } }
"lurker"
"chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()", ".write": "data.parent().child('members').child(auth.uid).val() == 'owner' || data.parent().child('members').child(auth.uid).val()=='chatter'" } } }
"chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()", ".write": "data.parent().child('members').child(auth.uid).val() != 'lurker'" } }
"chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()", ".write": "data.parent().child('members').child(auth.uid).val() == 'owner' || data.parent().child('members').child(auth.uid).val()=='chatter'" }, "members": { ".read": "data.child(auth.uid).exists()", ".write": "data.child(auth.uid).exists()" } } }
"chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()", ".write": "data.parent().child('members').child(auth.uid).val() == 'owner' || data.parent().child('members').child(auth.uid).val()=='chatter'" }, "members": { ".read": "data.child(auth.uid).val() == 'owner'", ".write": "data.child(auth.uid).val() == 'owner'" } } }
"chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()", ".write": "data.parent().child('members').child(auth.uid).val() == 'owner' || data.parent().child('members').child(auth.uid).val()=='chatter'" }, "members": { ".read": "data.child(auth.uid).val() == 'owner'", ".write": "data.child(auth.uid).val() == 'owner'" }, "pending": { "$uid": { ".write": "$uid === auth.uid" } } } }
pending/
"pending": { "$uid": { ".write": "$uid === auth.uid && !data.exists()" } }
"pending": { "$uid": { ".write": "$uid === auth.uid && !data.exists() && !data.parent().parent().child('members').child($uid).exists()" } }
pending
"pending": { ".read": "data.parent().child('members').child(auth.uid).val() === 'owner'", ".write": "data.parent().child('members').child(auth.uid).val() === 'owner'", "$uid": { ".write": "$uid === auth.uid && !data.exists() && !data.parent().parent().child('members').child($uid).exists()" } }
"members": { ".read": "data.child(auth.uid).val() == 'owner'", ".write": "data.child(auth.uid).val() == 'owner' ||(!data.exists()&&newData.child(auth.uid).val()=='owner')" }
/chats/chat_345/members
{ "user_zzz" : "owner" }
user_zzz
chat_456/messages/abc
chat_456
"user_zzz"
/chats/chat_987/members
{ "rules": { "chats": { "$chatID": { "messages": { ".read": "data.parent().child('members').child(auth.uid).exists()", ".write": "data.parent().child('members').child(auth.uid).val() == 'owner' || data.parent().child('members').child(auth.uid).val()=='chatter'" }, "members": { ".read": "data.child(auth.uid).val() == 'owner'", ".write": "data.child(auth.uid).val() == 'owner' ||(!data.exists()&&newData.child(auth.uid).val()=='owner')" }, "pending": { ".read": "data.parent().child('members').child(auth.uid).val() === 'owner'", ".write": "data.parent().child('members').child(auth.uid).val() === 'owner'", "$uid": { ".write": "$uid === auth.uid && !data.exists() && !data.parent().parent().child('members').child($uid).exists()" } } } } } }
sendNotificationToUser("puf", "Hi there puf!");
public static void sendNotificationToUser(String user, final String message) { Firebase ref = new Firebase(FIREBASE_URL); final Firebase notifications = ref.child("notificationRequests"); Map notification = new HashMap<>(); notification.put("username", user); notification.put("message", message); notifications.push().setValue(notification); }
notificationRequests $pushid message: "Hello there" username: "puf"
var firebase = require('firebase'); var request = require('request'); var API_KEY = "..."; // Your Firebase Cloud Server API key firebase.initializeApp({ serviceAccount: ".json", databaseURL: "https://.firebaseio.com/" }); ref = firebase.database().ref(); function listenForNotificationRequests() { var requests = ref.child('notificationRequests'); ref.on('child_added', function(requestSnapshot) { var request = requestSnapshot.val(); sendNotificationToUser( request.username, request.message, function() { request.ref().remove(); } ); }, function(error) { console.error(error); }); }; function sendNotificationToUser(username, message, onSuccess) { request({ url: 'https://fcm.googleapis.com/fcm/send', method: 'POST', headers: { 'Content-Type' :' application/json', 'Authorization': 'key='+API_KEY }, body: JSON.stringify({ notification: { title: message }, to : '/topics/user_'+username }) }, function(error, response, body) { if (error) { console.error(error); } else if (response.statusCode >= 400) { console.error('HTTP Error: '+response.statusCode+' - '+response.statusMessage); } else { onSuccess(); } }); } // start listening listenForNotificationRequests();
String username = "puf"; FirebaseMessaging.getInstance().subscribeToTopic("user_"+username);
