fix: Improve STORAGE_EMULATOR_HOST usage

[le0pard]

Problem

• if provided STORAGE_EMULATOR_HOST env, apiEndpoint == baseUrl. This lead to invalid url to fetch data, because no storage/v1 in baseUrl
• if provided apiEndpoint, in this case all works

Expected behaviour

• STORAGE_EMULATOR_HOST env works same way as apiEndpoint property

Fix

• Apply same logic for STORAGE_EMULATOR_HOST as for apiEndpoint to generate baseUrl

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[ddelgrosso1]

Hi @le0pard we appreciate the contribution. However, there is a reason we do not append pathing to STORAGE_EMULATOR_HOST. For more details see: #2087 and #2092

[le0pard]

Thanks @ddelgrosso1 Should we just introduce new env variable, which will work the same as apiEndpoint, while team busy make STORAGE_EMULATOR_HOST work with Firebase Storage emulator ?

[ddelgrosso1]

@le0pard fair question. Let me check internally with the firebase team as to what the current status is. The problem with adding a new variable is it is one more thing to maintain and deprecating something else becomes a long task.

Is there a problem with using apiEndpoint for your use case?

[le0pard]

Thanks @ddelgrosso1

apiEndpoint is exactly how I resolve this issue for now. Problem, that in project we are using node.js and python code. In python sdk STORAGE_EMULATOR_HOST works as expected ( https://github.com/googleapis/python-storage/blob/main/google/cloud/storage/client.py#L168-L171 ) , but not in node.js sdk. So in python code I dont need create any additional code for sdk to switch endpoint for local development. Just pass env variable in docker container.

In JS codebase I need create separate env variable like GCLOUD_API_ENDPOINT and write code, which will check this env variable to make sdk work in same way, as python:

const {
  Storage: GoogleStorage
} = require('@google-cloud/storage')

const STORAGE_ENDPOINT = process.env.GCLOUD_API_ENDPOINT ?? undefined

const storage = new GoogleStorage({
  apiEndpoint: STORAGE_ENDPOINT
})

And of course I cannot share same STORAGE_EMULATOR_HOST env variable, because it is "break" node.js sdk right now