sf_auth(login_url = ) Bad Request (HTTP 400)

[rdinter-usda]

Issues with authentication for private instance of Salesforce that appears similar to #111 and #108.

> sf_auth(login_url = "https://PRIVATE-INSTANCE.lightning.force.com/")
Waiting for authentication in browser...
Press Esc/Ctrl + C to abort
Authentication complete.
Error in oauth2.0_access_token(endpoint, app, code = code, user_params = user_params,  : 
  Bad Request (HTTP 400). Failed to get an access token.

Authentication appears to work through the browser, however this error shows up in R. What is strange is I can see a file .httr-oauth-salesforcer in working directory that is created and it is roughly 6 bytes. Then when I attempt to try sf_list_reports() another window pops up for authentication, the browser says authentication worked, and once I return to R the report list is displayed.

[StevenMMortimer]

Is this still an issue @rdinter-usda? Based on what you described, it prompts twice and works the second time?

I will also be switching the package over from {{httr}} to the {{httr2}} package, which maybe could help some of these transient errors if it handles the authentication in a more sophisticated way. I'm not sure.

[rdinter-usda]

Yes this is still an issue, although I would not say it works the second time. Each time I call sf_auth(login_url = ) it fails with an error. However, if I call other functions used in salesforceR like sf_list_reports() then it succeeds. I believe that's related to some side-effect of cacheing of the oauth.

[StevenMMortimer]

Are you accessing your R session on a remote server via the browser? In other words, are you not running it locally on your laptop? Or is it possible that some other process is running on port 1410 of your machine?

According to this article, it sounds like either of those would cause issues like you're seeing and you'd have to try and use out of band authentication. I can try to add those arguments to the sf_auth() function so they can be passed through to {{httr}} package functions.

[rdinter-usda]

I am using R locally and verified that port 1410 is not being used by any other process, although that article does sound like similar issues to what I am seeing because of the 400 error that is displayed.

[dethmasque]

I was seeing the same behavior when running salesforcer::sf_auth(login_url="https://example.my.salesforce.com") locally. The error in the URL implied that this is PKCE-related: http://localhost:1410/?error=invalid_request&error_description=missing+required+code+challenge. Turning off PKCE at the organization level resolved the error and allowed for successful authentication:

 salesforcer::sf_auth(login_url = "https://example.my.salesforce.com")
Waiting for authentication in browser...
Press Esc/Ctrl + C to abort
Authentication complete.

[StevenMMortimer]

@dethmasque Really appreciate your comment about PKCE! I'll add that to the function documentation and getting started article. Thanks again!

cc @rdinter-usda