(Objective-C) Set Container Metadata

Azure Storage Blob Service REST API: Sample code to set the user-defined metadata of a container.

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#import <CkoRest.h>
#import <CkoAuthAzureStorage.h>
#import <NSString.h>

// Azure Blob Service Example: Set Container User-Defined Metadata
// See also: https://msdn.microsoft.com/en-us/library/azure/dd179362.aspx

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoRest *rest = [[CkoRest alloc] init];

// Connect to the Azure Storage Blob Service
BOOL bTls = YES;
int port = 443;
BOOL bAutoReconnect = YES;
// In this example, the storage account name is "chilkat".
BOOL success = [rest Connect: @"chilkat.blob.core.windows.net" port: [NSNumber numberWithInt: port] tls: bTls autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Provide Azure Cloud credentials for the REST call.
CkoAuthAzureStorage *azAuth = [[CkoAuthAzureStorage alloc] init];
azAuth.AccessKey = @"AZURE_ACCESS_KEY";
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.Account = @"chilkat";
azAuth.Scheme = @"SharedKey";
azAuth.Service = @"Blob";
// This causes the "x-ms-version: 2020-08-04" header to be automatically added.
azAuth.XMsVersion = @"2020-08-04";
success = [rest SetAuthAzureStorage: azAuth];

// Note: The application does not need to explicitly set the following
// headers: x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// Add each name-value pair of metadata to associate with the container.
// To remove all metadata from the container, simply don't add any x-ms-meta- headers.
success = [rest AddHeader: @"x-ms-meta-Category" value: @"Images"];
success = [rest AddHeader: @"x-ms-meta-Resolution" value: @"High"];

// The expected success response is a 200 response status code with no response body.
// In this example, we are setting the metadata of the container named "mycontainer".
NSString *responseStr = [rest FullRequestNoBody: @"PUT" uriPath: @"/mycontainer?restype=container&comp=metadata"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// When successful, the Azure Storage service will respond with a 200 response status code,
// with no response body.

if ([rest.ResponseStatusCode intValue] != 200) {
    // Examine the request/response to see what happened.
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@%@",@"response body (if any): ",responseStr);
    NSLog(@"%@",@"---");
    NSLog(@"%@%@",@"LastRequestStartLine: ",rest.LastRequestStartLine);
    NSLog(@"%@%@",@"LastRequestHeader: ",rest.LastRequestHeader);
    return;
}

NSLog(@"%@",@"Success.");