functions-samples/message-translation

Automatic message translation using the Google Translate API.

This template shows how to translate a new message in a given language into multiple destination languages.

Cloud Function Code

See file index.js for the code.

This is done by using the Google Translate API to translate the new message. The translated output is written into a fanned out structure using the langauge code as the key.

The dependencies are listed in package.json.

Sample Database Structure

As an example we'll be using a simple database structure:

/functions-project-12345
    /messages
        /en
            /key-123456
                translated: false
                text: "Hey Bob! How Are you?"
            /key-123457
                translated: false
                text: "Hey Mat! How Are you?"

Trigger rules

Below is the trigger rule for the translate function making sure it's triggered when a new message is added.

  "functions": {
    ".source": "functions",
    "translate": {
      "triggers": {
        "database": {
          "path": "/messages/$languageID/$messageID",
          "condition": "newData.child('translated').val() === false"
        }
      }
    }
  }