Digitalocean provider (#171)

* Implement Digitalocean provider
* Vendor digitalocean lib
* Enable SRV for Digitalocean and fix the tests
* Test cname etc. records pointing to the same domain

vendor/github.com/digitalocean/godo/floating_ips_actions.go

@@ -0,0 +1,110 @@
+package godo
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/digitalocean/godo/context"
+)
+
+// FloatingIPActionsService is an interface for interfacing with the
+// floating IPs actions endpoints of the Digital Ocean API.
+// See: https://developers.digitalocean.com/documentation/v2#floating-ips-action
+type FloatingIPActionsService interface {
+	Assign(ctx context.Context, ip string, dropletID int) (*Action, *Response, error)
+	Unassign(ctx context.Context, ip string) (*Action, *Response, error)
+	Get(ctx context.Context, ip string, actionID int) (*Action, *Response, error)
+	List(ctx context.Context, ip string, opt *ListOptions) ([]Action, *Response, error)
+}
+
+// FloatingIPActionsServiceOp handles communication with the floating IPs
+// action related methods of the DigitalOcean API.
+type FloatingIPActionsServiceOp struct {
+	client *Client
+}
+
+// Assign a floating IP to a droplet.
+func (s *FloatingIPActionsServiceOp) Assign(ctx context.Context, ip string, dropletID int) (*Action, *Response, error) {
+	request := &ActionRequest{
+		"type":       "assign",
+		"droplet_id": dropletID,
+	}
+	return s.doAction(ctx, ip, request)
+}
+
+// Unassign a floating IP from the droplet it is currently assigned to.
+func (s *FloatingIPActionsServiceOp) Unassign(ctx context.Context, ip string) (*Action, *Response, error) {
+	request := &ActionRequest{"type": "unassign"}
+	return s.doAction(ctx, ip, request)
+}
+
+// Get an action for a particular floating IP by id.
+func (s *FloatingIPActionsServiceOp) Get(ctx context.Context, ip string, actionID int) (*Action, *Response, error) {
+	path := fmt.Sprintf("%s/%d", floatingIPActionPath(ip), actionID)
+	return s.get(ctx, path)
+}
+
+// List the actions for a particular floating IP.
+func (s *FloatingIPActionsServiceOp) List(ctx context.Context, ip string, opt *ListOptions) ([]Action, *Response, error) {
+	path := floatingIPActionPath(ip)
+	path, err := addOptions(path, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return s.list(ctx, path)
+}
+
+func (s *FloatingIPActionsServiceOp) doAction(ctx context.Context, ip string, request *ActionRequest) (*Action, *Response, error) {
+	path := floatingIPActionPath(ip)
+
+	req, err := s.client.NewRequest(ctx, http.MethodPost, path, request)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	root := new(actionRoot)
+	resp, err := s.client.Do(ctx, req, root)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return root.Event, resp, err
+}
+
+func (s *FloatingIPActionsServiceOp) get(ctx context.Context, path string) (*Action, *Response, error) {
+	req, err := s.client.NewRequest(ctx, http.MethodGet, path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	root := new(actionRoot)
+	resp, err := s.client.Do(ctx, req, root)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return root.Event, resp, err
+}
+
+func (s *FloatingIPActionsServiceOp) list(ctx context.Context, path string) ([]Action, *Response, error) {
+	req, err := s.client.NewRequest(ctx, http.MethodGet, path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	root := new(actionsRoot)
+	resp, err := s.client.Do(ctx, req, root)
+	if err != nil {
+		return nil, resp, err
+	}
+	if l := root.Links; l != nil {
+		resp.Links = l
+	}
+
+	return root.Actions, resp, err
+}
+
+func floatingIPActionPath(ip string) string {
+	return fmt.Sprintf("%s/%s/actions", floatingBasePath, ip)
+}