How to get project id in Google Cloud Storage

Question

I have activated Google Cloud Storage on my Gmail account, then created a new Project. As far as I see, and read from tutorials ( https://developers.google.com/storage/docs/json_api/v1/json-api-java-samples ), Client Secrets (client_secrets.json) are related to Projects, not to my account.

Now, while using Java API, there is a way to receive the list of buckets,

https://developers.google.com/storage/docs/json_api/v1/buckets/list

Though it asks me to enter the project identifier as parameter.

I checked API documentation, the download client secrets file (client_secrets.json), and Java methods, though nothing is providing me the "Project Identifier" that is related to authenticated client secret's project.

Is there any method to find out on which project I am actively authenticated? I wouldn't want programme user to remember each project's identifier every time they authenticate in Java programme. The client secrets file is already related to a single project.

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Extra Information: Currently I developed a GUI Java application. By using Open File Dialog, user selects the downloaded "client_secrets.json" file. Then I use that example provided "authorise" method to get Credentials and Storage objects.

After this, I want to list all buckets those are available in current project programmatically. (Current Project = The client_secrets.json is downloaded from a specific project.). But API requires me to enter the project name which doesn't seem to get programmatically.

Answer 1

You should be able to see it in the Developer Console . Click on a project, and at the top it will tell you the project ID.

(If you were looking for a way of getting this programmatically, please clarify this in your question - it's not clear what information you "have in your hand" when you want to get the project ID... or whether you're expecting your users to create their own projects.)

Answer 2

Run

gsutil ls -L -b gs://<bucket-name>

to get the bucket info, you can find the project number from the output. Then you could run

gcloud projects list --filter "PROJECT_NUMBER=<project-number>"

to find out the project ID.

Answer 3

Update: The current version of the json-file (used for authentication) contains the ProjectId.

The suggested way is to create a "service account key" json file, like so: https://cloud.google.com/docs/authentication/production#creating_a_service_account (p12 is only there for backward-compatibility)

Thus, you can read it from the json file like so: (C# Code, but Java Code should be very close) (Note: static constructor is called before first instantiation of class)

    public class YourClass
    {
        private static readonly string GoogleProjectId;

        static YourClass()
        {
            var GoogleAutFilePath = Environment.GetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS");
            var GContent = JsonConvert.DeserializeObject<JObject>(File.ReadAllText(GoogleAutFilePath));
            GoogleProjectId = GContent["project_id"].ToString();
        }
    }

Answer 4

If you have jq :

project_number=$(gsutil acl get gs://<bucket> | jq ".[0].projectTeam.projectNumber")
gcloud projects list --filter "PROJECT_NUMBER=$project_number"