Add dag put

Author: whyrusleeping

dag.go

@@ -0,0 +1,46 @@
+package shell
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"strings"
+
+	files "github.com/whyrusleeping/go-multipart-files"
+)
+
+func (s *Shell) DagPut(data, kind string) (string, error) {
+	req := s.newRequest("dag/put")
+	req.Opts = map[string]string{
+		"input-enc": "hex",
+		"format":    kind,
+	}
+
+	r := strings.NewReader(data)
+	rc := ioutil.NopCloser(r)
+	fr := files.NewReaderFile("", "", rc, nil)
+	slf := files.NewSliceFile("", "", []files.File{fr})
+	fileReader := files.NewMultiFileReader(slf, true)
+	req.Body = fileReader
+
+	resp, err := req.Send(s.httpcli)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Close()
+
+	if resp.Error != nil {
+		return "", resp.Error
+	}
+
+	var out struct {
+		Cid struct {
+			Ref string `json:"/"`
+		}
+	}
+	err = json.NewDecoder(resp.Output).Decode(&out)
+	if err != nil {
+		return "", err
+	}
+
+	return out.Cid.Ref, nil
+}