Initial commit

This was originally hashicorp/terraform#7058, however due to issues
(documented in the README) it can't be included in Terraform mainline.
More than a few people have still found it useful though, and an
external plugin has been requested.

This has been tested as of today and is still functional (the HTTP test
was skipped but the Route53 tests are all functional, and the plugin
works outside of the tests).

Also added code to use the dnssimple and powerdns lego modules.

.gitignore

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+*.dll
+*.exe
+.DS_Store
+example.tf
+terraform.tfplan
+terraform.tfstate
+bin/
+modules-dev/
+/pkg/
+website/.vagrant
+website/.bundle
+website/build
+website/node_modules
+.vagrant/
+*.backup
+./*.tfstate
+.terraform/
+*.log
+*.bak
+*~
+.*.swp
+.idea
+*.iml
+*.test
+*.iml
+
+website/vendor

LICENSE

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+Copyright 2016 PayByPhone Technologies, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+

Makefile

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+test:
+	go test -v ./plugin/providers/acme 
+
+testacc:
+	TF_ACC=1 go test -v ./plugin/providers/acme -run="TestAcc"
+
+build: deps
+	gox -osarch="linux/amd64 windows/amd64 darwin/amd64" \
+	-output="pkg/{{.OS}}_{{.Arch}}/terraform-provider-acme" .
+
+deps:
+	go get -u github.com/mitchellh/gox
+
+clean:
+	rm -rf pkg/

README.md

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+Terraform ACME Provider
+========================
+
+This repository contains a plugin form of the ACME provider that was proposed
+and submitted in [Terraform PR #7058][1].
+
+## Why a Plugin?
+
+As documented in the thread in the PR, making use of [`xenolf/lego`][2], while
+making the task a little less daunting, nontheless created some coupling of the
+authorization and certificate generation process that (rightfully) did not sit
+well with the core TF team. Further to that, as the authorization process allows
+the use of DNS provdiers that Terraform has support for, the potential to cross
+provider boundaries exists.
+
+Hence it was determined that it might not be the best fit for upstream for the
+time being.
+
+Nonetheless, the code in this repository is still completely functional and
+there have been a few people that have found it useful. An external plugin was
+requested, so here it is. :)
+
+## Installing
+
+See the [Plugin Basics][3] page of the Terraform docs to see how to plunk this
+into your config. Check the [releases page][4] of this repo to get releases for
+Linux, OS X, and Windows.
+
+## Usage
+
+The documentation from the old PR has been preserved and you can look [here][5]
+to find it.
+
+[1]: https://github.com/hashicorp/terraform/pull/7058
+[2]: https://github.com/xenolf/lego
+[3]: https://www.terraform.io/docs/plugins/basics.html
+[4]: https://github.com/paybyphone/terraform-provider-acme/releases
+[5]: website/source/docs/providers/acme

main.go

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+package main
+
+import (
+	"github.com/hashicorp/terraform/plugin"
+	"github.com/paybyphone/terraform-provider-acme/plugin/providers/acme"
+)
+
+func main() {
+	plugin.Serve(&plugin.ServeOpts{
+		ProviderFunc: acme.Provider,
+	})
+}