Realtime Database-Trigger

// The Cloud Functions for Firebase SDK to setup triggers and logging.
const {onRequest} = require("firebase-functions/https");
const {onValueCreated} = require("firebase-functions/database");
const {logger} = require("firebase-functions");

// The Firebase Admin SDK to access the Firebase Realtime Database.
const admin = require("firebase-admin");
admin.initializeApp();
index.js

# The Cloud Functions for Firebase SDK to create Cloud Functions and set up triggers.
from firebase_functions import db_fn, https_fn

# The Firebase Admin SDK to access the Firebase Realtime Database.
from firebase_admin import initialize_app, db

app = initialize_app()
main.py

// All Realtime Database instances at path "/user/{uid}"
// There must be at least one Realtime Database present.
const onWrittenFunctionDefault = onValueWritten("/user/{uid}", (event) => {
  // …
});

// Instance named "my-app-db-2", at path "/user/{uid}".
// The "my-app-db-2" instance must exist in this region.
const OnWrittenFunctionInstance = onValueWritten(
  {
    ref: "/user/{uid}",
    instance: "my-app-db-2"
  },
  (event) => {
    // …
  }
);

// Instance with "my-app-db-" prefix, at path "/user/{uid}", where uid ends with @gmail.com.
// There must be at least one Realtime Database with "my-app-db-*" prefix in this region.
const onWrittenFunctionInstance = onValueWritten(
  {
    ref: "/user/{uid=*@gmail.com}",
    instance: "my-app-db-*"
  },
  (event) => {
    // …
  }
);

# All Realtime Database instances at path "/user/{uid}"
# There must be at least one Realtime Database present.
@db_fn.on_value_written(r"/user/{uid}")
def onwrittenfunctiondefault(event: db_fn.Event[db_fn.Change]):
    # ...
    pass

# Instance named "my-app-db-2", at path "/user/{uid}".
# The "my-app-db-2" instance must exist in this region.
@db_fn.on_value_written(
    reference=r"/user/{uid}",
    instance="my-app-db-2",
)
def on_written_function_instance(event: db_fn.Event[db_fn.Change]):
    # ...
    pass

# Instance with "my-app-db-" prefix, at path "/user/{uid}", where uid ends with @gmail.com.
# There must be at least one Realtime Database with "my-app-db-*" prefix in this region.
@db_fn.on_value_written(
    reference=r"/user/{uid=*@gmail.com}",
    instance="my-app-db-*",
)
def on_written_function_instance(event: db_fn.Event[db_fn.Change]):
    # ...
    pass

// Listens for new messages added to /messages/:pushId/original and creates an
// uppercase version of the message to /messages/:pushId/uppercase
// for all databases in 'us-central1'
exports.makeuppercase = onValueCreated(
    "/messages/{pushId}/original",
    (event) => {
    // Grab the current value of what was written to the Realtime Database.
      const original = event.data.val();
      logger.log("Uppercasing", event.params.pushId, original);
      const uppercase = original.toUpperCase();
      // You must return a Promise when performing
      // asynchronous tasks inside a function, such as
      // writing to the Firebase Realtime Database.
      // Setting an "uppercase" sibling in the
      // Realtime Database returns a Promise.
      return event.data.ref.parent.child("uppercase").set(uppercase);
    },
);
index.js

@db_fn.on_value_created(reference="/messages/{pushId}/original")
def makeuppercase(event: db_fn.Event[Any]) -> None:
    """Listens for new messages added to /messages/{pushId}/original and
    creates an uppercase version of the message to /messages/{pushId}/uppercase
    """

    # Grab the value that was written to the Realtime Database.
    original = event.data
    if not isinstance(original, str):
        print(f"Not a string: {event.reference}")
        return

    # Use the Admin SDK to set an "uppercase" sibling.
    print(f"Uppercasing {event.params['pushId']}: {original}")
    upper = original.upper()
    parent = db.reference(event.reference).parent
    if parent is None:
        print("Message can't be root node.")
        return
    parent.child("uppercase").set(upper)
main.py

  exports makeUppercase = onValueWritten("/messages/{pushId}/original", (event) => {
        // Only edit data when it is first created.
        if (event.data.before.exists()) {
          return null;
        }
        // Exit when the data is deleted.
        if (!event.data.after.exists()) {
          return null;
        }
        // Grab the current value of what was written to the Realtime Database.
        const original = event.data.after.val();
        console.log('Uppercasing', event.params.pushId, original);
        const uppercase = original.toUpperCase();
        // You must return a Promise when performing asynchronous tasks inside a Functions such as
        // writing to the Firebase Realtime Database.
        // Setting an "uppercase" sibling in the Realtime Database returns a Promise.
        return event.data.after.ref.parent.child('uppercase').set(uppercase);
      });

@db_fn.on_value_written(reference="/messages/{pushId}/original")
def makeuppercase2(event: db_fn.Event[db_fn.Change]) -> None:
    """Listens for new messages added to /messages/{pushId}/original and
    creates an uppercase version of the message to /messages/{pushId}/uppercase
    """

    # Only edit data when it is first created.
    if event.data.before is not None:
        return

    # Exit when the data is deleted.
    if event.data.after is None:
        return

    # Grab the value that was written to the Realtime Database.
    original = event.data.after
    if not hasattr(original, "upper"):
        print(f"Not a string: {event.reference}")
        return

    # Use the Admin SDK to set an "uppercase" sibling.
    print(f"Uppercasing {event.params['pushId']}: {original}")
    upper = original.upper()
    parent = db.reference(event.reference).parent
    if parent is None:
        print("Message can't be root node.")
        return
    parent.child("uppercase").set(upper)
main.py

// The Cloud Functions for Firebase SDK to setup triggers and logging.
const {onValueWritten} = require("firebase-functions/v2/database");
const {logger} = require("firebase-functions");
const admin = require("firebase-admin");

admin.initializeApp();

exports.dbtrigger = onValueWritten("/messages/{pushId}/original", async (event) => {
  // 1. Check whether authtype is admin. If it is, skip this operation.
  if (event.authType === "admin") {
    logger.log("Modification by admin detected. Skipping uppercase conversion.");
    return null;
  }

  // 2. Retrieve the userID of the sender (assumed sibling node 'senderId')
  const snapshot = await event.data.after.ref.parent.child("senderId").get();
  const senderId = snapshot.val();

  // 3. Check if userID of sender of message = event.authid
  if (senderId !== event.authId) {
    logger.error(`Unauthorized write: senderId (${senderId}) does not match authId (${event.authId})`);
    return null;
  }

  // Grab the value that was written to the Realtime Database.
  const original = event.data.after.val();
  logger.log("Uppercasing", event.params.pushId, original);
  const uppercase = original.toUpperCase();

  // Return the promise to set the "uppercase" sibling node.
  return event.data.after.ref.parent.child("uppercase").set(uppercase);
});

from firebase_functions import db_fn
from firebase_admin import initialize_app, db

initialize_app()

@db_fn.on_value_written(reference="/messages/{pushId}/original")
def makeuppercase(event: db_fn.Event[db_fn.Change]) -> None:
    # 1. Check whether authtype is admin. If it is, skip this operation.
    if event.auth_type == "admin":
        print("Admin user detected. Skipping.")
        return

    # 2. Retrieve the userID of the sender (assumed sibling node: 'senderId')
    parent_ref = db.reference(event.reference).parent
    sender_id = parent_ref.child("senderId").get()

    # 3. Check if userID of sender = event.auth_id
    if sender_id != event.auth_id:
        print(f"Unauthorized: sender_id {sender_id} != auth_id {event.auth_id}")
        return

    # Exit when the data is deleted.
    if event.data.after is None:
        return

    # Grab the value and uppercase it
    original = event.data.after
    if not isinstance(original, str):
        return

    print(f"Uppercasing {event.params['pushId']}: {original}")
    upper = original.upper()
    parent_ref.child("uppercase").set(upper)