(PureBasic) 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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IncludeFile "CkXml.pb"
IncludeFile "CkHttp.pb"

Procedure ChilkatExample()

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

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; keyID = Access Key ID or Access Key
    CkHttp::setCkAwsAccessKey(http, "access-key")

    ; applicationKey = Secret Access Key or Secret Key
    CkHttp::setCkAwsSecretKey(http, "secret-key")

    ; Region is the 2nd part of your S3 Endpoint
    CkHttp::setCkAwsEndpoint(http, "s3.us-west-002.backblazeb2.com")

    bucketName.s = "chilkat-test"

    strXml.s = CkHttp::ckS3_ListBucketObjects(http,bucketName)
    If CkHttp::ckLastMethodSuccess(http) <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    Debug "Response status code = " + Str(CkHttp::ckLastStatus(http))

    xml.i = CkXml::ckCreate()
    If xml.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkXml::ckLoadXml(xml,strXml)
    If success <> 1
        Debug CkXml::ckLastErrorText(xml)
        CkHttp::ckDispose(http)
        CkXml::ckDispose(xml)
        ProcedureReturn
    EndIf

    ; If the response status code was not 200, then the XML response is not a 
    ; listing of objects, but instead contains error information.
    If CkHttp::ckLastStatus(http) <> 200
        Debug CkXml::ckGetXml(xml)
        Debug "Failed."
        CkHttp::ckDispose(http)
        CkXml::ckDispose(xml)
        ProcedureReturn
    EndIf

    ; A sample response is shown below.
    Debug CkXml::ckGetXml(xml)
    Debug "----"

    ; 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>

    ETag.s
    Key.s
    LastModified.s
    ID.s
    SizeDecimalStr.s
    StorageClass.s

    ListBucketResult_xmlns.s = CkXml::ckGetAttrValue(xml,"xmlns")
    i.i = 0
    count_i.i = CkXml::ckNumChildrenHavingTag(xml,"Contents")
    While i < count_i
        CkXml::setCkI(xml, i)
        ETag = CkXml::ckGetChildContent(xml,"Contents[i]|ETag")
        Key = CkXml::ckGetChildContent(xml,"Contents[i]|Key")
        LastModified = CkXml::ckGetChildContent(xml,"Contents[i]|LastModified")
        ID = CkXml::ckGetChildContent(xml,"Contents[i]|Owner|ID")
        SizeDecimalStr = CkXml::ckGetChildContent(xml,"Contents[i]|Size")
        StorageClass = CkXml::ckGetChildContent(xml,"Contents[i]|StorageClass")
        i = i + 1
    Wend
    IsTruncated.s = CkXml::ckGetChildContent(xml,"IsTruncated")
    MaxKeys.i = CkXml::ckGetChildIntValue(xml,"MaxKeys")
    Name.s = CkXml::ckGetChildContent(xml,"Name")


    CkHttp::ckDispose(http)
    CkXml::ckDispose(xml)


    ProcedureReturn
EndProcedure