Make this provider Terraform 0.12 ready

[antonbabenko]

Thank you for this provider!

Is your feature request related to a problem? Please describe.
I'd like to use this provider to manage files (antonbabenko/terraform-docs-as-pdf#2) on Dropbox using Terraform 0.12, but it is not compatible with available 0.12 beta or alpha.

Describe the solution you'd like
Recompile it with Terraform 0.12 source code

Describe alternatives you've considered
Terraform 0.11 potentially will work fine with this provider (see #7), but I would like to use Terraform 0.12 there

Additional context

provider "dropbox" {
  access_token = "${var.token}"
}

data "dropbox_user_current" "curr" {}

output "user_id" {
  value = "${data.dropbox_user_current.curr.account_id}"
}

Gives this error:

Error: Failed to retrieve schema from provider "dropbox": rpc error: code = Unavailable desc = all SubConns are in TransientFailure, latest connection error: connection error: desc = "transport: authentication handshake failed: tls: first record does not look like a TLS handshake"

[callensm]

The TLS error could be something on your end. Are you working behind a proxy or something that would cause handshake failure if not done properly?

[antonbabenko]

I don’t think there is anything wrong on my side, because I used Terraform normally right after I was trying this provider and opened this issue yesterday. 24 лют. 2019 р. о 16:11 Matthew Callens <notifications@github.com> пише:

…

The TLS error could be something on your end. Are you working behind a proxy or something that would cause handshake failure if not done properly? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[callensm]

According to this document Terraform's 0.12 has a redesigned RPC system that seems to not be cross-compatible with previous version of Terraform.

I'm going to wait until it is actually released before I update the provider to use 0.12.

[callensm]

Supports terraform 0.12 as of v3 release

[antonbabenko]

Great! Thank you!