如何使用WWW API获取oauth2令牌？

Question

I am working on a project that requires to oauth2 token to communicate. The backend gives me a curl command, but I have no idea how to put it into WWW form in Unity because I have no former experience with http or json file. Could you help me to access the token? Thanks. Here how the curl code looks like:

$ curl -v -u {CLIENT_ID}:{CLIENT_SECRET} " https://api.domo.com/oauth/token?grant_type=client_credentials&scope= {SCOPE}"

and here is an example:

$ curl -v -u 441e307a-b2a1-4a99-8561-174e5b153fsa:f103fc453d08bdh049edc9a1913e3f5266447a06d1d2751258c89771fbcc8087 " https://api.domo.com/oauth/token?grant_type=client_credentials&scope=data%20user "

Thank you so much!

Answer 1

To get oauth2 token with the WWW API, use the WWWForm to create form that contains the grant_type , client_id and client_secret . When you make the request, the token should be returned in Json format. Use Unity's JsonUtility to convert it to string you can easily obtain.

Retrieving Token :

[Serializable]
public class TokenClassName
{
    public string access_token;
}

IEnumerator GetAccessToken()
{
    var url = "http://yoururl.com";
    var form = new WWWForm();
    form.AddField("grant_type", "client_credentials");
    form.AddField("client_id", "login-secret");
    form.AddField("client_secret", "secretpassword");

    WWW www = new WWW(url, form);

    //wait for request to complete
    yield return www;

    //and check for errors
    if (String.IsNullOrEmpty(www.error))
    {
        string resultContent = www.text;
        UnityEngine.Debug.Log(resultContent);
        TokenClassName json = JsonUtility.FromJson<TokenClassName>(resultContent);
        UnityEngine.Debug.Log("Token: " + json.access_token);
    }
    else
    {
        //something wrong!
        UnityEngine.Debug.Log("WWW Error: " + www.error);
    }
}

Using the Token :

After you receive the token, it will be stored in the json.access_token variable. You can use then use that to make requests by adding it to the Header of your other WWW requests. That header is stored in a Dictionary like this:

headers.Add("Authorization", "Bearer " + token);

Here is an full example for making a request with the received token:

IEnumerator makeRequestWithToken(string token)
{
    var url = "http://yoururl.com";

    Dictionary<string, string> headers = new Dictionary<string, string>();
    headers.Add("Authorization", "Bearer " + token);

    WWWForm formData = new WWWForm();
    formData.AddField("YourField", "YourVal");
    formData.AddField("YourField", "YourVal");

    WWW www = new WWW(url, formData.data, headers);
    yield return www;

    //and check for errors
    if (String.IsNullOrEmpty(www.error))
    {
        string resultContent = www.text;
        UnityEngine.Debug.Log(resultContent);
    }
    else
    {
        //something wrong!
        UnityEngine.Debug.Log("WWW Error: " + www.error);
    }
}

Unity now uses UnityWebRequest . If possible start using that. Here is an example of retrieving oauth2 with UnityWebRequest .

Note that both functions are coroutine functions and must be started with the StartCoroutine function like StartCoroutine(GetAccessToken()); and StartCoroutine(makeRequestWithToken("YourToken")); .

Answer 2

I got it working using the following method: Refer to Travis's fitbit code

var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(_clientID + ":" + _consumerSecret);  
var encoded = Convert.ToBase64String(plainTextBytes);  
var form = new WWWForm();  
form.AddField("client_id", _clientID);  
form.AddField("grant_type", "authorization_code");  
form.AddField("redirect_uri", WWW.UnEscapeURL(CallBackUrl));  
form.AddField("code", _returnCode);  
var headers = form.headers;  
headers["Authorization"] = "Basic " + encoded;  
_wwwRequest = new WWW("https://api.fitbit.com/oauth2/token", form.data, headers);  

Relate to your backend, see what kind of oauth2 they are using, you can see the oauth2 documentation Here . Feel free to leave a comment for question.