login issues

[stillmatic]

in order to login we basically need to reimplement the login() function (https://github.com/quiltdata/quilt/blob/2a5dff59b6ae3616bfe504f9134522579d8e5606/quilt/tools/command.py#L166). we can't reuse the existing code because neither reticulate nor command line via system() accepts input of the access token.

the easiest way to do it is something like this:

qlogin <- function(quilt_url = 'https://pkg.quiltdata.com') {
    # QUILT_PKG_URL = os.environ.get('QUILT_PKG_URL', DEFAULT_QUILT_PKG_URL)
    quilt <- reticulate::import("quilt")
    login_url <- sprintf("%s/login", quilt_url)
    browseURL(login_url)
    refresh_token <- readline("Enter the code from the page: ")
    # hacky stuff follows - names shouldn't start with underscores in R
    auth <- eval(parse(
        text = paste("quilt$tools$command$_update_auth(refresh_token)")))
    eval(parse(
        text = paste("quilt$tools$command$_save_auth(auth)")
    ))
    eval(parse(
        text = paste("quilt$tools$command$_clear_session()")
    ))
}

however, in R, names cannot start with underscores; even though this code will compile, it will not run when we get to the eval step. the unexported auth code is a problem here.

possible workarounds:

• in Python, implement a login_with_code() method. this would act like login(), but accept the access token as a parameter. this is probably most robust.
• in R, reimplement the unexported auth functions. I would rather not do this because auth procedures are liable to change, and i'm not entirely sure that we could easily pass the auth tokens between reticulate sessions.

[stillmatic]

closed in f7c5440