How to call Windows Azure Storage RestFul Service without SDK? - rest

Question

I try to use Windows Azure like a Storage fom Salesforce.com.
I cheked the documentation and I only can see call the calls to azure rest api from SDK (Java, .Net, JS, etc) examples.
I need integrate Salesforce with Windows Azure Storage but, Azure don't have a SDK for Salesforce.com
From Salesforce.com is allow the calls to rest services but the process to call Azure Rest Services require one o more librarys.
Exameple:
Authentication for the Azure Storage Services require of:
Headers: Date Header and Authorization Header
The Authorization Header require two elments
SharedKey
Account Name
Authorization="[SharedKey|SharedKeyLite] :"
SharedKey and Account Name give a conversion:
HMAC-SHA256 conversion
over UTF-8 encoded
For this convertion the documentation referes to SDK Librarys in others words Java Class or .Net Class type helper that in Salesforce.com not exist.
Please, I need a example to call the authentification service without sdk
Sorry for my bad English.
Visit: https://learn.microsoft.com/en-us/rest/api/storageservices/fileservices/authentication-for-the-azure-storage-services

Answer 1

I need a example to call the authentification service without sdk
We could generate signature string and specify Authorization header for the request of performing Azure storage services without installing SDK. Here is a simple working sample to list the containers, you could refer to my generateAuthorizationHeader function and Authentication for the Azure Storage Services to construct the signature string.
string StorageAccount = "mystorageaccount";
string StorageKey = "my storage key";
string requestMethod = "GET";
string mxdate = "";
string storageServiceVersion = "2014-02-14";
protected void btnlist_Click(object sender, EventArgs e)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(string.Format(CultureInfo.InvariantCulture,
"https://{0}.blob.core.windows.net/?comp=list",
StorageAccount
));
req.Method = requestMethod;
//specify request header
string AuthorizationHeader = generateAuthorizationHeader();
req.Headers.Add("Authorization", AuthorizationHeader);
req.Headers.Add("x-ms-date", mxdate);
req.Headers.Add("x-ms-version", storageServiceVersion);
using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())
{
var stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream);
string content = reader.ReadToEnd();
StringReader theReader = new StringReader(content);
DataSet theDataSet = new DataSet();
theDataSet.ReadXml(theReader);
DataTable dt = theDataSet.Tables[2];
}
}
public string generateAuthorizationHeader()
{
mxdate = DateTime.UtcNow.ToString("R");
string canonicalizedHeaders = string.Format(
"x-ms-date:{0}\nx-ms-version:{1}",
mxdate,
storageServiceVersion);
string canonicalizedResource = string.Format("/{0}/\ncomp:list", StorageAccount);
string stringToSign = string.Format(
"{0}\n\n\n\n\n\n\n\n\n\n\n\n{1}\n{2}",
requestMethod,
canonicalizedHeaders,
canonicalizedResource);
HMACSHA256 hmac = new HMACSHA256(Convert.FromBase64String(StorageKey));
string signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
String authorization = String.Format("{0} {1}:{2}",
"SharedKey",
StorageAccount,
signature
);
return authorization;
}
Besides, please refer to Azure Storage Services REST API Reference to know more about programmatic access to Azure Storage Services via REST APIs.

Answer 2

I find a way to solve this.
You should use Shared Sing, here explain me:
Enter to Portal Azure
Open the Account Storage
In the General Information click on "Share sing access"
Enable all permissions that you need (In my case only Enable "File")
Enable all resources permission that you need (In my case onl Enable "Service, Container and Object")
Define and Start Date and End Date (This is the space of time that Shared Key will be valid)
Define protocol type (In my case use HTTPS)
Clic on "Generate SAS" button
After this process you will get a token like this:
?sv=2016-05-31&ss=f&srt=sco&sp=rwdlc&se=2017-11-28T04:29:49Z&st=2017-02-18T20:29:49Z&spr=https&sig=rt7Loxo1MHGJqp0F6ryLhYAmOdRreyiYT418ybDN2OI%3D
You have to use this Token like Autentication
Example Call Code List a Content:
public with sharing class CallAzureRestDemo {
public string token = '&sv=2016-05-31&ss=f&srt=sco&sp=rwdlc&se=2017-02-19T04:00:44Z&st=2017-02-18T20:00:44Z&spr=https&sig=GTWGQc5GOAvQ0BIMxMbwUpgag5AmUVjrfZc56nHkhjI%3D';
//public Integer batchSize;
public CallAzureRestDemo(){}
public void getlistcontent(String endpoint)
{
// Create HTTP GET request
HttpRequest req = new HttpRequest();
req.setMethod('GET');
req.setEndpoint(endpoint+token);
Http http = new Http();
HTTPResponse res;
System.debug(LoggingLevel.INFO, '##RESPONSE: '+res);
// only do this if not running in a test method
if(!Test.isRunningTest())
{
System.debug(LoggingLevel.INFO, 'Sending the message to Azure');
res = http.send(req);
System.debug(LoggingLevel.INFO, 'http.send result status: ' + res.getStatus());
}
else
{
System.debug(LoggingLevel.INFO, 'Running in a test so not sending the message to Azure');
}
}
}
Example TestMethod:
#isTest
private class Test_CallAzureRestDemo {
static testMethod void myUnitTest() {
CallAzureRestDemo oRest = new CallAzureRestDemo();
try{
//Call the method and set endpoint
oRest.getlistcontent('https://accountstoragecomex.file.core.windows.net/?comp=list');
}catch(Exception e){
System.debug('##'+e);
}
}
}
Example to Response:
20:15:47.64 (79388244)|CALLOUT_REQUEST|[100]|System.HttpRequest[Endpoint=https://accountstoragecomex.file.core.windows.net/?comp=list&sv=2016-05-31&ss=f&srt=sco&sp=rwdlc&se=2017-02-19T04:00:44Z&st=2017-02-18T20:00:44Z&spr=https&sig=GTWGQc5GOAvQ0BIMxMbwUpgag5AmUVjrfZc56nHkhjI%3D, Method=GET]
20:15:47.64 (395755012)|CALLOUT_RESPONSE|[100]|System.HttpResponse[Status=OK, StatusCode=200]
Example Call Service "FILE - Get List Share"
Call To List Content
One more time, Sorry for my bad english.