fix digitalocean v2 api content-type when using json

In case of using json we need to set content-type header.
Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>

builder/digitalocean/api.go

@@ -24,7 +24,7 @@ type Size struct {
 	Memory       uint     `json:"memory,omitempty"`        //only in v2 api
 	VCPUS        uint     `json:"vcpus,omitempty"`         //only in v2 api
 	Disk         uint     `json:"disk,omitempty"`          //only in v2 api
-	Transfer     uint     `json:"transfer,omitempty"`      //only in v2 api
+	Transfer     float64  `json:"transfer,omitempty"`      //only in v2 api
 	PriceMonthly float64  `json:"price_monthly,omitempty"` //only in v2 api
 	PriceHourly  float64  `json:"price_hourly,omitempty"`  //only in v2 api
 	Regions      []string `json:"regions,omitempty"`       //only in v2 api

builder/digitalocean/api_v2.go

@@ -285,17 +285,21 @@ func NewRequestV2(d DigitalOceanClientV2, path string, method string, req interf
 		enc.Encode(req)
 		defer buf.Reset()
 		request, err = http.NewRequest(method, url, buf)
+		request.Header.Add("Content-Type", "application/json")
 	} else {
 		request, err = http.NewRequest(method, url, nil)
 	}
 	if err != nil {
 		return err
 	}
+
 	// Add the authentication parameters
 	request.Header.Add("Authorization", "Bearer "+d.APIToken)
-
-	log.Printf("sending new request to digitalocean: %s", url)
-
+	if buf != nil {
+		log.Printf("sending new request to digitalocean: %s buffer: %s", url, buf)
+	} else {
+		log.Printf("sending new request to digitalocean: %s", url)
+	}
 	resp, err := client.Do(request)
 	if err != nil {
 		return err
@@ -325,7 +329,10 @@ func NewRequestV2(d DigitalOceanClientV2, path string, method string, req interf
 		return errors.New(fmt.Sprintf("Failed to decode JSON response %s (HTTP %v) from DigitalOcean: %s", err.Error(),
 			resp.StatusCode, body))
 	}
-
+	switch resp.StatusCode {
+	case 403, 429, 422, 404, 503, 500:
+		return errors.New(fmt.Sprintf("digitalocean request error: %+v", res))
+	}
 	return nil
 }
 

builder/digitalocean/builder.go

@@ -17,7 +17,7 @@ import (
 )
 
 // see https://api.digitalocean.com/images/?client_id=[client_id]&api_key=[api_key]
-// name="Ubuntu 12.04.4 x64", id=3101045,
+// name="Ubuntu 12.04.4 x64", id=6374128,
 const DefaultImage = "ubuntu-12-04-x64"
 
 // see https://api.digitalocean.com/regions/?client_id=[client_id]&api_key=[api_key]