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问用Windows 7解析REST
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Stack Overflow用户

提问于 2014-06-25 12:33:41

回答 1查看 345关注 0票数 0

我希望在WP 7应用程序中实现一个ParseObject创建和获取。在WP8中我们有SDK，但是在WP7中，由于没有SDK，所以我们可以使用REST。得到是容易的，但在岗位上，我找不到锻炼。

curl命令是：

curl -X POST \
  -H "X-Parse-Application-Id: xxxxxxxxxx" \
  -H "X-Parse-REST-API-Key: xxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"score":1337,"playerName":"Sean Plott","cheatMode":false}' \
  https://api.parse.com/1/classes/GameScore

如何将其转换为等效的WP7请求？

rest

windows-phone-7

parse-platform

回答 1

Stack Overflow用户

回答已采纳

发布于 2014-07-07 17:06:17

让我们看一下创建用户的以下解析文档

curl -X POST \
  -H "X-Parse-Application-Id: Your App ID" \
  -H "X-Parse-REST-API-Key: Your REST API Key" \
  -H "Content-Type: application/json" \
  -d '{"username":"cooldude6","password":"p_n7!-e8","phone":"415-392-0202"}' \
  https://api.parse.com/1/users

Parse文档显示，您必须设置您的http请求标头(-H表示标头)来指定应用程序id和api键。还可以将内容类型作为application/json添加到标头中。

接下来，文档显示了包含用户名和密码的正文(这是-d所代表的内容)中的post内容。

因此，为了创建一个新用户，您必须正确地设置头和正文。您可以使用HttpWebRequest来处理这个问题。在下面的示例中，我们在Parse帐户上创建一个新用户。

创建新的用户帐户

public async Task<User> CreateUserAsync(User user)
{
    // An anonymous Type that converts our properties to match the Parse API casing.
    var anonymousUser = new
    {
        email = user.Email.ToLower(),
        password = user.Password,
        username = user.UserName.ToLower(),
        userId = user.UserId,
    };

    // I use the Newtonsoft Json library to serialize the anonymous type to json
    // which is what the server expects (due to ContentType=application/json).
    string json = await JsonConvert.SerializeObjectAsync(anonymousUser);

    // Next we set up our request URL, headers Content Type.
    HttpWebRequest request = HttpWebRequest.CreateHttp(new Uri("https://api.parse.com/1/users"));
    request.Headers["X-Parse-Application-Id"] = "Your App ID";
    request.Headers["X-Parse-REST-API-Key"] = "Your REST API Key";
    request.ContentType = "application/json";

    // Since we are sending information to the server, we have to set the Method to POST.
    request.Method = "POST";

    Open a stream writer using the response stream provided by our request.       
    using (var streamWriter = new StreamWriter(await request.GetRequestStreamAsync()))
    {
        // Write our Json to the server.
        streamWriter.Write(json);
    }

    // Fetch a response from the server. This will give us back error codes or a successful code
    var response = await request.GetResponseAsync();
    string resultJson = string.Empty;

    // Convert Read the Json response in to a string
    using (var streamReader = new StreamReader(response.GetResponseStream()))
    {
        resultJson = streamReader.ReadToEnd(); 
    }

    // Create an anonymous Type matching the response documented in the Parse API
    var deserializedObject = new
    {
        createdAt = string.Empty,
        objectId = string.Empty,
        sessionToken = string.Empty,
    };

    // Deserialize in to our response object.
    deserializedObject = JsonConvert.DeserializeAnonymousType(resultJson, deserializedObject);

    // Save the session token provided so we can use it later.
    // You will need to determine how you want to save this.
    await SaveSessionTokenAsync(deserializedObject.sessionToken);

    DateTime createdDate = DateTime.Now;
    DateTime.TryParse(deserializedObject.createdAt, out createdDate);
    user.CreatedDate = createdDate;

    // Return the newly created user.
    return user;
}

用户模型

user模型非常简单。

public class User
{
    public string Username {get; set;}
    public string Password {get; set;}
    public string Email {get; set;}
    public Guid UserId {get; set;}
    public DateTime CreatedDate {get; set;}
}

Parse文档显示了您可以期望服务器作为响应返回的内容。

{
  "createdAt": "2011-11-07T20:58:34.448Z",
  "objectId": "g7y9tkhB7O",
  "sessionToken": "pnktnjyb996sj4p156gjtp4im"
}

我们使用上面的deserilizedObject匿名类型来模拟这个过程。这样我们就能捕捉到sessionToken。您可以获取该会话令牌并将其保存到本地磁盘。这样，每次用户重新打开应用程序时，您都可以将会话令牌传递给服务器，并让用户返回，而不必每次都让用户登录。

请注意，当前存储会话令牌有一个副作用，在生产过程中可能不会对任何人产生影响，但在开发过程中可能会有点烦人。如果创建新用户并保存会话令牌，然后从仪表板中删除用户，则会话令牌仍然有效，并返回缓存的用户。我报告说这是一个bug，Parse团队正在努力解决这个问题，但目前，从仪表板中删除一个用户并不会阻止保存的会话令牌继续工作。

恢复用户状态

Parse文档显示了得到一个用户的以下内容。

curl -X GET \
  -H "X-Parse-Application-Id: Your App ID" \
  -H "X-Parse-REST-API-Key: Your REST API Key" \
  -H "X-Parse-Session-Token: pnktnjyb996sj4p156gjtp4im" \
  https://api.parse.com/1/users/me

这再次要求您设置一些标头，但不需要在正文中指定任何内容。通过将会话令牌按到url，您将获得一个用户(如果它存在)。然后，如果您保存了会话令牌，则可以使用以下方法来处理还原用户状态

    public async Task<User> GetUserAsync()
    {
        // I will leave how you save/load the session to you.
        string sessionToken = await LoadSessionTokenAsync();

        HttpWebRequest request = HttpWebRequest.CreateHttp(new Uri("https://api.parse.com/1/users"));
        request.Headers["X-Parse-Application-Id"] = "Your app ID";
        request.Headers["X-Parse-REST-API-Key"] = "Your REST API Key";
        request.Headers["X-Parse-Session-Token"] = sessionToken;
        request.Method = "GET";

        var response = await request.GetResponseAsync();
        string resultJson = string.Empty;
        using (var streamReader = new StreamReader(response.GetResponseStream()))
        {
            resultJson = streamReader.ReadToEnd();
        }

        var deserializedUser = new
        {
            username = string.Empty,
            email = string.Empty,
            userId = string.Empty,
            createdAt = string.Empty,
        };

        deserializedUser = JsonConvert.DeserializeAnonymousType(resultJson, deserializedUser);

        var user = new User
        {
            UserName = deserializedUser.username,
            Email = deserializedUser.email,
        };

        // Handle data conversions
        Guid guid = Guid.Empty;
        DateTime createdDate = DateTime.Now;
        Guid.TryParse(deserializedUser.userId, out guid);
        DateTime.TryParse(deserializedUser.createdAt, out createdDate);

        user.CreatedDate = createdDate;
        user.UserId = guid;

        return user;
    }

登录用户

最后，文档显示了用于服务的登录用户的以下内容。

curl -X GET \
  -H "X-Parse-Application-Id: Your App ID" \
  -H "X-Parse-REST-API-Key: Your REST API Key" \
  -G \
  --data-urlencode 'username=cooldude6' \
  --data-urlencode 'password=p_n7!-e8' \
  https://api.parse.com/1/login

在此，我们不再提供任何机构。--数据-urlencode仅仅意味着您必须将此数据作为url的一部分传递。所以从本质上说，URL看起来像

https://api.parse.com/1/login/?username=cooldude6&password=p_n7!-e8

为了演示这一点，我们再次启动了一个GET，但只是稍微调整了URL，以包含url编码的数据。

    public async Task<User> LoginAsync(string username, string password)
    {
        string url = string.Format("https://api.parse.com/1/login?username={0}&password={1}", username, password);
        HttpWebRequest request = HttpWebRequest.CreateHttp(new Uri(url));
        request.Headers["X-Parse-Application-Id"] = "Your App ID";
        request.Headers["X-Parse-REST-API-Key"] = "Your REST API Key";
        request.Method = "GET";

        var response = await request.GetResponseAsync();
        string resultJson = string.Empty;
        using (var streamReader = new StreamReader(response.GetResponseStream()))
        {
            resultJson = streamReader.ReadToEnd();
        }

        var deserializedUser = new
        {
            username = string.Empty,
            email = string.Empty,
            userId = string.Empty,
            createdAt = string.Empty,
        };

        deserializedUser = JsonConvert.DeserializeAnonymousType(resultJson, deserializedUser);

        var user = new User
        {
            UserName = deserializedUser.username,
            Email = deserializedUser.email,
        };

        // Handle data conversions
        Guid guid = Guid.Empty;
        DateTime createdDate = DateTime.Now;
        Guid.TryParse(deserializedUser.userId, out guid);
        DateTime.TryParse(deserializedUser.createdAt, out createdDate);

        user.CreatedDate = createdDate;
        user.UserId = guid;

        return user;
    }

查询

希望这能为您提供一个良好的基础，让您了解如何阅读他们的文档以及curl参数代表什么。根据我前面演示的内容，您应该能够在API中查询对象，而不会有太多问题。例如，文档显示了查询如下。

curl -X GET \
  -H "X-Parse-Application-Id: Your App ID" \
  -H "X-Parse-REST-API-Key: Your REST API Key" \
  https://api.parse.com/1/classes/GameScore

这不过是我们为用户所做的事情。在这种情况下，您不需要任何会话令牌。您只需使用上面的URL创建一个HttpWebRequest，设置头部并调用GetResponseAsync。

        HttpWebRequest request = HttpWebRequest.CreateHttp(new Uri("https://api.parse.com/1/classes/GameScore"));
        request.Headers["X-Parse-Application-Id"] = "Your App ID";
        request.Headers["X-Parse-REST-API-Key"] = "Your REST API Key";
        request.Method = "GET";

        var response = await request.GetResponseAsync();
        string resultJson = string.Empty;
        using (var streamReader = new StreamReader(response.GetResponseStream()))
        {
            // Get the Json, now you can deserialize it in to what ever represents your object.
            resultJson = streamReader.ReadToEnd();
        }

如果您想要执行条件查询，您只需使用一个编码的url，就像我们对用户名和密码所做的一样。

在本例中，我会将匿名类型序列化为Json并提供该类型。沿着这些路线的东西。

        var query = new
        {
            playName = "Bob",
            cheatMode = "false",
        };

        string json = JsonConvert.SerializeObject(query);
        string url = string.Format("https://api.parse.com/1/classes/GameScore?where={0}", query);
        HttpWebRequest request = HttpWebRequest.CreateHttp(new Uri(url));
        request.Headers["X-Parse-Application-Id"] = "Your App ID";
        request.Headers["X-Parse-REST-API-Key"] = "Your REST API Key";
        request.Method = "GET";

        var response = await request.GetResponseAsync();
        string resultJson = string.Empty;
        using (var streamReader = new StreamReader(response.GetResponseStream()))
        {
            resultJson = streamReader.ReadToEnd();
        }

希望这有助于您开始使用API。有了这些示例，您应该能够使用每个Parse，而不会出现任何问题。

最后，下面的链接可以帮助您确定CURL选项代表什么。http://curl.haxx.se/docs/manpage.html

票数 2

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/24408808

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