(Objective-C) Backblaze S3 List Bucket Objects

See more Backblaze S3 Examples

Demonstrates how to list the objects in a bucket.

The Chilkat S3 functions in the HTTP class are compatible with the Backblaze service. However, because of some specific issues, Chilkat v9.5.0.89 or later is needed.

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#import <CkoHttp.h>
#import <NSString.h>
#import <CkoXml.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

// keyID = Access Key ID or Access Key
http.AwsAccessKey = @"access-key";

// applicationKey = Secret Access Key or Secret Key
http.AwsSecretKey = @"secret-key";

// Region is the 2nd part of your S3 Endpoint
http.AwsEndpoint = @"s3.us-west-002.backblazeb2.com";

NSString *bucketName = @"chilkat-test";

NSString *strXml = [http S3_ListBucketObjects: bucketName];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response status code = ",[http.LastStatus intValue]);

CkoXml *xml = [[CkoXml alloc] init];
BOOL success = [xml LoadXml: strXml];
if (success != YES) {
    NSLog(@"%@",xml.LastErrorText);
    return;
}

// If the response status code was not 200, then the XML response is not a 
// listing of objects, but instead contains error information.
if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@",[xml GetXml]);
    NSLog(@"%@",@"Failed.");
    return;
}

// A sample response is shown below.
NSLog(@"%@",[xml GetXml]);
NSLog(@"%@",@"----");

// Use this online tool to generate parsing code from sample XML: 
// Generate Parsing Code from XML

// <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
// <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
//     <Contents>
//         <ETag>"303fb46cf341094fef6274b7789cd6aa"</ETag>
//         <Key>orchard.json</Key>
//         <LastModified>2021-10-30T14:45:52.000Z</LastModified>
//         <Owner>
//             <ID>f2ebbc5f792c</ID>
//             <DisplayName/>
//         </Owner>
//         <Size>22</Size>
//         <StorageClass>STANDARD</StorageClass>
//     </Contents>
//     <Contents>
//         <ETag>"a8551f0a5437f43a796fca7623ee9232"</ETag>
//         <Key>seahorse.jpg</Key>
//         <LastModified>2021-10-30T14:38:53.000Z</LastModified>
//         <Owner>
//             <ID>f2ebbc5f792c</ID>
//             <DisplayName/>
//         </Owner>
//         <Size>24388</Size>
//         <StorageClass>STANDARD</StorageClass>
//     </Contents>
//     <IsTruncated>false</IsTruncated>
//     <MaxKeys>1000</MaxKeys>
//     <Name>chilkat-test</Name>
//     <Prefix/>
//     <Marker/>
// </ListBucketResult>

NSString *ETag = 0;
NSString *Key = 0;
NSString *LastModified = 0;
NSString *ID = 0;
NSString *SizeDecimalStr = 0;
NSString *StorageClass = 0;

NSString *ListBucketResult_xmlns = [xml GetAttrValue: @"xmlns"];
int i = 0;
int count_i = [[xml NumChildrenHavingTag: @"Contents"] intValue];
while (i < count_i) {
    xml.I = [NSNumber numberWithInt: i];
    ETag = [xml GetChildContent: @"Contents[i]|ETag"];
    Key = [xml GetChildContent: @"Contents[i]|Key"];
    LastModified = [xml GetChildContent: @"Contents[i]|LastModified"];
    ID = [xml GetChildContent: @"Contents[i]|Owner|ID"];
    SizeDecimalStr = [xml GetChildContent: @"Contents[i]|Size"];
    StorageClass = [xml GetChildContent: @"Contents[i]|StorageClass"];
    i = i + 1;
}

NSString *IsTruncated = [xml GetChildContent: @"IsTruncated"];
int MaxKeys = [[xml GetChildIntValue: @"MaxKeys"] intValue];
NSString *Name = [xml GetChildContent: @"Name"];