IBM Watson语音到文本WebSocket授权，带有IAM API密钥

Question

我正试图用一个仅具有IAM授权的新帐户连接到IBM Watson的语音转文本WebSocket。

我的WS端点是wss://stream-fra.watsonplatform.net/text-to-speech/api/v1/recognize，我通过https://iam.bluemix.net/identity/token获得访问令牌。现在，当我打开具有值为Bearer token的Authorization标头的套接字连接时，我得到一个错误的握手响应：websocket: bad handshake, Unauthorized 401。语言就是围棋。

我是做错了什么，还是在没有用户名/密码验证的情况下无法连接到Watson的语音转文本WebSocket，即不推荐使用的watson-token？

编辑：

打开WebSocket:的代码

headers := http.Header{}
headers.Set("Authorization", "Bearer " + access_token)
conn, resp, err := websocket.DefaultDialer.Dial("wss://stream-fra.watsonplatform.net/text-to-speech/api/v1/recognize", headers)

我还尝试了apikey:**api_key**的基本授权，结果是一样的：401。

编辑2:

获取成功并返回访问和刷新令牌的访问令牌(基于Watson Swift和Python SDK(的代码：

func getWatsonToken(apiKey string) (string, error) {
// Base on the Watson Swift and Python SDKs
// https://github.com/watson-developer-cloud/restkit/blob/master/Sources/RestKit/Authentication.swift
// https://github.com/watson-developer-cloud/python-sdk/blob/master/watson_developer_cloud/iam_token_manager.py
const tokenUrl = "https://iam.bluemix.net/identity/token"
form := url.Values{}
form.Set("grant_type", "urn:ibm:params:oauth:grant-type:apikey")
form.Set("apikey", apiKey)
form.Set("response_type", "cloud_iam")
// Token from simple "http.PostForm" does not work either
//resp, err := http.PostForm(tokenUrl, form)
req, err := http.NewRequest(http.MethodPost, tokenUrl, nil)
if err != nil {
log.Printf("could not create HTTP request to get Watson token: %+v", err)
return "", nil
}
header := http.Header{}
header.Set("Content-Type", "application/x-www-form-urlencoded")
header.Set("Accept", "application/json")
// "Yng6Yng=" is "bx:bx"
header.Set("Authorization", "Basic Yng6Yng=")
req.Header = header
req.Body = ioutil.NopCloser(bytes.NewReader([]byte(form.Encode())))
resp, err := http.DefaultClient.Do(req)
if err != nil {
log.Printf("problem executing HTTP request to get Watson token: %+v", err)
return "", err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return "", errors.New(fmt.Sprintf("failed to get Watson token: %d", resp.StatusCode))
}
jsonBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Printf("problem reading Watson token from response body: %+v", err)
}
tokenResponse := &struct {
AccessToken  string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
TokenType    string `json:"token_type"`
ExpiresIn    int64  `json:"expires_in"`
Expiration   int64  `json:"expiration"`
}{}
err = json.Unmarshal(jsonBody, tokenResponse)
if err != nil {
log.Printf("could not parse Watson token response: %+v", err)
return "", err
}
return tokenResponse.AccessToken, err
}

Answer 1

我在端点中出错，使用了文本对语音而不是语音对文本。有了正确的URL，WebSocket API就可以工作了。

wss://stream-fra.watsonplatform.net/text-to-speech/api/v1/recognize应为wss://stream-fra.watsonplatform.net/speech-to-text/api/v1/recognize