adding stubs for command line API

client/command/client.go

@@ -0,0 +1,104 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strconv"
+)
+
+var (
+	ErrNotFound       = errors.New("Not Found")
+	ErrForbidden      = errors.New("Forbidden")
+	ErrBadRequest     = errors.New("Bad Request")
+	ErrNotAuthorized  = errors.New("Unauthorized")
+	ErrInternalServer = errors.New("Internal Server Error")
+)
+
+type Client struct {
+	Token string
+	URL   string
+}
+
+// Do submits an http.Request and parses the JSON-encoded http.Response,
+// storing the result in the value pointed to by v.
+func (c *Client) Do(method, path string, in, out interface{}) error {
+
+	// create the URI
+	uri, err := url.Parse(c.URL + path)
+	if err != nil {
+		return err
+	}
+
+	if len(uri.Scheme) == 0 {
+		uri.Scheme = "http"
+	}
+
+	if len(c.Token) > 0 {
+		params := uri.Query()
+		params.Add("access_token", c.Token)
+		uri.RawQuery = params.Encode()
+	}
+
+	// create the request
+	req := &http.Request{
+		URL:           uri,
+		Method:        method,
+		ProtoMajor:    1,
+		ProtoMinor:    1,
+		Close:         true,
+		ContentLength: 0,
+	}
+
+	// if data input is provided, serialize to JSON
+	if in != nil {
+		inJson, err := json.Marshal(in)
+		if err != nil {
+			return err
+		}
+
+		buf := bytes.NewBuffer(inJson)
+		req.Body = ioutil.NopCloser(buf)
+
+		req.ContentLength = int64(len(inJson))
+		req.Header.Set("Content-Length", strconv.Itoa(len(inJson)))
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	// make the request using the default http client
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	// Read the bytes from the body (make sure we defer close the body)
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	// Check for an http error status (ie not 200 StatusOK)
+	switch resp.StatusCode {
+	case 404:
+		return ErrNotFound
+	case 403:
+		return ErrForbidden
+	case 401:
+		return ErrNotAuthorized
+	case 400:
+		return ErrBadRequest
+	case 500:
+		return ErrInternalServer
+	}
+
+	// Unmarshall the JSON response
+	if out != nil {
+		return json.Unmarshal(body, out)
+	}
+
+	return nil
+}