func (c *Client) request(credentials *Credentials, url string, param web.Values) (*Credentials, web.Values, os.Error) {
c.SignParam(credentials, "POST", url, param)
resp, err := http.PostForm(url, param.StringMap())
if err != nil {
return nil, nil, err
}
p, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return nil, nil, err
}
if resp.StatusCode != 200 {
return nil, nil, os.NewError(fmt.Sprintf("OAuth server status %d, %s", resp.StatusCode, string(p)))
}
m := make(web.Values)
err = m.ParseFormEncodedBytes(p)
if err != nil {
return nil, nil, err
}
credentials = &Credentials{Token: m.Get("oauth_token"), Secret: m.Get("oauth_token_secret")}
if credentials.Token == "" {
return nil, nil, os.NewError("No OAuth token in server result")
}
if credentials.Secret == "" {
return nil, nil, os.NewError("No OAuth secret in server result")
}
return credentials, m, nil
}
// getJSON fetches a URL and decodes the response body as JSON.
func getJSON(urlStr string, param web.Values) (interface{}, os.Error) {
if param != nil {
urlStr = urlStr + "?" + param.FormEncodedString()
}
r, err := http.Get(urlStr)
if err != nil {
return nil, err
}
defer r.Body.Close()
if r.StatusCode != 200 {
return nil, os.NewError(fmt.Sprint("Status ", r.StatusCode))
}
p, _ := ioutil.ReadAll(r.Body)
var v interface{}
err = json.NewDecoder(bytes.NewBuffer(p)).Decode(&v)
if err != nil {
return nil, err
}
return v, nil
}
// getUrlEncodedForm fetches a URL and decodes the response body as a URL encoded form.
func getUrlEncodedForm(urlStr string, param web.Values) (web.Values, os.Error) {
if param != nil {
urlStr = urlStr + "?" + param.FormEncodedString()
}
r, err := http.Get(urlStr)
if err != nil {
return nil, err
}
defer r.Body.Close()
if r.StatusCode != 200 {
return nil, os.NewError(fmt.Sprint("Status ", r.StatusCode))
}
p, err := ioutil.ReadAll(r.Body)
if err != nil {
return nil, err
}
m := make(web.Values)
err = m.ParseFormEncodedBytes(p)
if err != nil {
return nil, err
}
return m, nil
}
// SignParam adds an OAuth signature to param.
func (c *Client) SignParam(credentials *Credentials, method, url string, param web.Values) {
param.Set("oauth_consumer_key", c.Credentials.Token)
param.Set("oauth_signature_method", "HMAC-SHA1")
param.Set("oauth_timestamp", strconv.Itoa64(time.Seconds()))
param.Set("oauth_nonce", nonce())
param.Set("oauth_version", "1.0")
if c.Scope != "" {
param.Set("scope", c.Scope)
}
if credentials != nil {
param.Set("oauth_token", credentials.Token)
}
param.Set("oauth_signature", signature(&c.Credentials, credentials, method, url, param))
}