在此发布请求中,有一个json主体,其中包含base64编码的数据(zip文件),如本例所示:
{“ foo”:“ bar”,“ data”:“您的base64字符串”}
在API策略中,我想向Azure存储REST API发送一个单独的请求,以将上述base64字符串另存为zip文件。
现在是问题:我可以成功将请求发送到Azure存储REST API,并通过以下语句下载生成的zip文件:
<set-body>@{
var base64String = (string)context.Variables.GetValueOrDefault<JObject>("body")["data"]) ;
var bytes = Convert.FromBase64String(base64String);
var ascii = Encoding.ASCII.GetString(bytes);
return ascii;
}</set-body>
事实是,我可以下载并打开zip文件,但是由于存档损坏,我无法提取其中的内容。
这是示例base64编码的zip文件字符串(包含text.txt的ZIP文件:]
UEsDBBQAAAAIAL1ZxE7MTbG/EwAAABMAAAAIAAAAdGVzdC50eHQLycgsVgCiRIWS1OKStMycVD0AUEsBAh8AFAAAAAgAvVnETsxNsb8TAAAAEwAAAAgAJAAAAAAAAAAgAAAAAAAAAHRlc3QudHh0CgAgAAAAAAABABgAI8Ac2LUa1QEjwBzYtRrVAZFuI861GtUBUEsFBgAAAAABAAEAWgAAADkAAAAAAA==
这是我将其发布到Rest API的代码:
<send-request mode="new" response-variable-name="putStorageRequest" timeout="5" ignore-error="true">
<set-url>@((string)context.Variables["blobUrl"])</set-url>
<set-method>PUT</set-method>
<set-header name="x-ms-date" exists-action="override">
<value>@((string) context.Variables["date"] )</value>
</set-header>
<set-header name="x-ms-version" exists-action="override">
<value>@((string) context.Variables["version"] )</value>
</set-header>
<set-header name="x-ms-blob-type" exists-action="override">
<value>BlockBlob</value>
</set-header>
<set-header name="Content-Type" exists-action="override">
<value>application/zip</value>
</set-header>
<set-header name="Authorization" exists-action="override">
<value>@{
string body = context.Request.Body.As<string>(preserveContent: true);
string contentType = "application/zip";
var base64String = (string)context.Variables.GetValueOrDefault<JObject>("body")["data"]) ;
var bytes = Convert.FromBase64String(base64String);
var ascii = Encoding.ASCII.GetString(bytes)
var contentLength = ascii.Length;
var hmacSha256 = new System.Security.Cryptography.HMACSHA256 { Key = Convert.FromBase64String(context.Variables.GetValueOrDefault<string>("storageKey")) };
var payLoad = string.Format("{0}\n\n\n{1}\n\n{2}\n\n\n\n\n\n\nx-ms-blob-type:BlockBlob\nx-ms-date:{3}\nx-ms-version:{4}\n{5}",
"PUT",
contentLength,
contentType,
context.Variables["date"],
context.Variables["version"],
"/" + context.Variables.GetValueOrDefault<string>("storageAccountName") + context.Variables.GetValueOrDefault<string>("resource"));
return "SharedKey "+ context.Variables.GetValueOrDefault<string>("storageAccountName") + ":" + Convert.ToBase64String(hmacSha256.ComputeHash(Encoding.UTF8.GetBytes(payLoad)));
}</value>
</set-header>
<set-body>@{
var base64String = (string)context.Variables.GetValueOrDefault<JObject>("body")["data"]) ;
var bytes = Convert.FromBase64String(base64String);
var ascii = Encoding.ASCII.GetString(bytes);
return ascii;
}</set-body>
</send-request>
Azure API管理现在在正文中支持byte []:
https://azure.microsoft.com/en-us/updates/azure-api-management-update-september-2019
set-body策略还接受字节数组作为主体内容。
我的测试通过在Blob-Storage中创建一个zip文件,下载,打开该zip文件并打开包含的文本文件而成功完成。
使用了以下代码:
<set-header name="Authorization" exists-action="override">
<value>@{
string body = context.Request.Body.As<string>(preserveContent: true);
string contentType = "application/zip";
var base64String = (string)context.Variables.GetValueOrDefault<JObject>("body")["data"] ;
var bytes = Convert.FromBase64String(base64String);
var contentLength = bytes.Length;
var hmacSha256 = new System.Security.Cryptography.HMACSHA256 { Key = Convert.FromBase64String(context.Variables.GetValueOrDefault<string>("storageKey")) };
var payLoad = string.Format("{0}\n\n\n{1}\n\n{2}\n\n\n\n\n\n\nx-ms-blob-type:BlockBlob\nx-ms-date:{3}\nx-ms-version:{4}\n{5}",
"PUT",
contentLength,
contentType,
context.Variables["date"],
context.Variables["version"],
"/" + context.Variables.GetValueOrDefault<string>("storageAccountName") + context.Variables.GetValueOrDefault<string>("resource"));
return "SharedKey "+ context.Variables.GetValueOrDefault<string>("storageAccountName") + ":" + Convert.ToBase64String(hmacSha256.ComputeHash(Encoding.UTF8.GetBytes(payLoad)));
}</value>
</set-header>
<set-body>@{
var base64String = (string)context.Variables.GetValueOrDefault<JObject>("body")["data"] ;
var bytes = Convert.FromBase64String(base64String);
return bytes;
}</set-body>
我只需要删除:
var ascii = Encoding.ASCII.GetString(bytes);