Installation from the Slack app directory is impossible, right?

[MattB543]

Description

As the authentication state is required there is no way to install the app from the Slack app directory, right? The only way for users to install the app is through the button generated at the /slack/install domain?

I found the below thread, so it seems that it's not supported as the Slack App Directory would work the same as the distribution tab, correct?

#492

TLDR: We decided the oauth library is not going to support the "Add to Slack" button from "Manage Distributions" due to security.

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[seratch]

Hi @MattB543 , thanks for writing in here!

I do understand your point here. Obviously, clicking install button twice is not a great user experience. However, as you guessed, Bolt for JavaScript does not offer out-of-the-box feature to easily redirection from the /slack/install URL without rendering a web page at this point.

Also, unfortunately, the code that generates the /slack/install endpoint is not yet customizable for developers. Thus, a workaround as of today is to implement your own /slack/install endpoint using receiver.router. Refer to this document to know how to add your custom endpoints to Bolt apps.

You can use the custom endpoint for Direct install URL of an App Directory app. To learn how to generate a valid set of parameters, checking this code is helpful. Your app can set a generated URL for "Location" header along with status 302 in response to HTTP requests.

const url = await this.installer!.generateInstallUrl({
  metadata: installerOptions.metadata,
  scopes: scopes!,
  userScopes: installerOptions.userScopes,
});

In Bolt for Python (and also Bolt for Java), we have an option to switch to a Direct Install URL compatible behavior. slackapi/bolt-python#183

Although we may add the similar option to Bolt for JavaScript in the near future, please go with the above workaround for now.

[MattB543]

Thank you, @seratch! Very clear and helpful answer. 🙏