Question

我试图序列化策略文档，以便开始使用Amazon Web Services S3存储。

http://aws.amazon.com/articles/1434描述了政策文件的以下格式：

{"expiration": "2009-01-01T00:00:00Z",
  "conditions": [ 
    {"bucket": "s3-bucket"}, 
    ["starts-with", "$key", "uploads/"],
    {"acl": "private"},
    {"success_action_redirect": "http://localhost/"},
    ["starts-with", "$Content-Type", ""],
    ["content-length-range", 0, 1048576]
  ]
}

如何在C＃中序列化？我尝试过创建这样的通用类：

[DataContract]
public class S3PolicyDocument
{
    [DataMember(Name = "expiration")]
    public DateTime expiration { get; set; }

    [DataMember(Name = "conditions")]
    public List<object> conditions { get; set; }

    public S3PolicyDocument()
    {
        conditions = new List<object>();
    }
}

然后像这样填充它：

S3PolicyDocument policyDoc = new S3PolicyDocument();
policyDoc.expiration = DateTime.Now.AddHours(1);
S3Bucket bucket = new S3Bucket();
bucket.bucket = "followThru";
S3acl acl = new S3acl();
acl.acl = "private";
S3success_action_redirect sar = new S3success_action_redirect();
sar.success_action_redirect = "";

policyDoc.conditions.Add(bucket);
policyDoc.conditions.Add(new string[] { "starts-with", "$key", "uploads/" });
policyDoc.conditions.Add(acl);
policyDoc.conditions.Add(sar);
policyDoc.conditions.Add(new string[] { "starts-with", "$Content-Type", "" });

但我无法使用DataContractJsonSerializer对此进行序列化。我如何在C＃中构建它？

或者只是将其粘贴为常量字符串，我无法正确格式化...如果这是解决方案，我将如何将其粘贴为字符串而不将所有内容放在一行上。 .IE这不起作用：

string PolicyDoc = "{
  \"expiration\": \"" + DateTime.Now.ToString() + "\",
  \"conditions\": [ 
    {\"bucket\": \"s3-bucket\"}, 
    [\"starts-with\", \"$key\", \"uploads/\"],
    {\"acl\": \"private\"},
    {\"success_action_redirect\": \"http://baasdf/\"},
    [\"starts-with\", \"$Content-Type\", \"\"],
    [\"content-length-range\", 0, 1048576]
  ]
}";

Answer 1

事实证明，这些值都可以格式化为数组。因此，将课程改为以下课程将会奏效。

[DataContract]
public class S3PolicyDocument
{
    [DataMember(Name = "expiration")]
    public string expiration { get; set; }

    [DataMember(Name = "conditions")]
    public List<string[]> conditions { get; set; }

    public S3PolicyDocument()
    {
        conditions = new List<string[]>();
    }
}

像这样填充类：

S3PolicyDocument policyDoc = new S3PolicyDocument();
policyDoc.expiration = DateTime.Now.AddHours(1).ToUniversalTime().ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'Z'");
policyDoc.conditions.Add(new string[] { "eq", "$bucket", "apples" });
policyDoc.conditions.Add(new string[] { "starts-with", "$key", "uploads/" });
policyDoc.conditions.Add(new string[] { "starts-with", "$acl", "private" });
policyDoc.conditions.Add(new string[] { "starts-with", "$success_action_redirect", "" });

AWS S3序列化策略文档

1 个答案: