![]() In lines 18–20 we initialize a custom NetHttpTransport instance with a proxy configuration. Listing 3: Enabling proxy support via a custom HTTP transport The easiest way is to configure proxy settings via system properties. There are couple of different ways to deploy the Java Admin SDK behind a proxy server. It appears that the SDK holds the gRPC connection to Firestore open until the program exists, and therefore it gets logged last. The subsequent calls are for Firestore and FCM. The call to is for fetching an access token. These are the three remote service calls made by our test application. The Squid access log can be found in the /apps/squid/var/log directory of the Docker container. If you inspect the access log of the Squid proxy while executing listing 1, you will see something like the following. Listing 1: Go application that uses Firestore and FCM $ export HTTPS_PROXY= You can try this out by executing listing 1, which invokes both Firestore and FCM APIs. Simply set the proxy server URL as an environment variable, and you are done. The Go Admin SDK is one of the easiest to deploy behind a proxy. This document should have a topicName field with the string value test-topic. Go ahead and create a collection named users in Firestore using the Firebase console. You will also need some sample data in your Firestore database to run these examples. If you’re new to all that, go through the Admin SDK getting started guide first. The rest of this article assumes you are familiar with at least one of the Firebase Admin SDK implementations, and you have some experience writing code with Firebase APIs. $ export GOOGLE_APPLICATION_CREDENTIALS=path/to/serviceAccount.json If you’re following along, set up your environment for ADC by downloading a service account JSON file from your Firebase project, and setting the following environment variable to point to it. We will need to forward these token fetch requests via the HTTP proxy as well. Therefore technically our application depends on three remote services. Credentials also call out to a remote service to obtain OAuth2 access tokens. The application uses Google application default credentials (ADC) to authorize remote service calls. sends a notification to the topic via Firebase Cloud Messaging (FCM).queries Cloud Firestore to find the name of a topic, and.Our test application depends on two cloud services. The above instructions and the Docker image are courtesy of him. Huge thanks to salmaan rashid for his excellent article on this subject. Once you are finished, you can simply exit the container’s shell to terminate the container. When started, the proxy server can be accessed via anywhere in your host. $ /apps/squid/sbin/squid -NsY -f /apps/ & Now you can run the following command in the container’s shell to fire off the Squid proxy. It also maps the port 3128 of the host to the port 3128 of the container. This command starts the container, and provides you a with bash shell with root access. $ docker run -p 3128:3128 -ti docker.io/salrashid123/squidproxy /bin/bash Execute the following command in a shell to get a Docker container with a Squid proxy up and running in your local machine. If you wish to try out the examples in this post, you will need an HTTP proxy server to test against. We leave Firebase Realtime Database out of the discussion for the most part, but if that’s what you care about, jump ahead towards the end of the post where I have remarked on that topic. We will focus on Firebase services that are typically accessed through a REST interface, as well as Cloud Firestore, which is accessed over gRPC. In this post we explore how to achieve this in several programming languages. This means applications that depend on Google Cloud Platform (GCP) libraries and Firebase Admin SDKs should be configured to make all outgoing service requests through a proxy. Firebase: Accessing Firestore and Firebase through a proxy serverĮnterprise developers often have to deploy their applications behind a corporate HTTP proxy in order to meet various security and IT compliance requirements.
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