(PureBasic) Upload String to Google Cloud Storage

Demonstrates how to upload an in-memory string to Google Cloud Storage.

Note: This example requires Chilkat v9.5.0.69 or later because it uses the http.PTextSb method.

Chilkat PureBasic Module Download

Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkXml.pb"

Procedure ChilkatExample()

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

    ; This example uses a previously obtained access token having permission for the 
    ; scope "https://www.googleapis.com/auth/cloud-platform"

    ; In this example, Get Google Cloud Storage OAuth2 Access Token, 
    ; the service account access token was saved to a text file.  This example fetches the access token from the file..
    sbToken.i = CkStringBuilder::ckCreate()
    If sbToken.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckLoadFile(sbToken,"qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8")

    ; Send a POST equivalent to this curl command.
    ; The content of the file is contained in the request body.

    ; curl -X POST --data-binary @[OBJECT] \
    ;     -H "Authorization: Bearer [OAUTH2_TOKEN]" \
    ;     -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
    ;     "https://www.googleapis.com/upload/storage/v1/b/[BUCKET_NAME]/o?uploadType=media&name=[OBJECT_NAME]"

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

    CkHttp::setCkAuthToken(http, CkStringBuilder::ckGetAsString(sbToken))

    ; Create an XML document, and write it to a StringBuilder.
    ; We'll be uploading this XML document.
    xml.i = CkXml::ckCreate()
    If xml.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkXml::setCkTag(xml, "note")
    CkXml::ckUpdateChildContent(xml,"to","Tove")
    CkXml::ckUpdateChildContent(xml,"from","Jani")
    CkXml::ckUpdateChildContent(xml,"heading","Reminder")
    CkXml::ckUpdateChildContent(xml,"body","Don't forget me this weekend!")

    ; Write the XML to sbXml.
    sbXml.i = CkStringBuilder::ckCreate()
    If sbXml.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkXml::ckGetXmlSb(xml,sbXml)

    ; sbXml contains this:

    ; <note>
    ;     <to>Tove</to>
    ;     <from>Jani</from>
    ;     <heading>Reminder</heading>
    ;     <body>Don't forget me this weekend!</body>
    ; </note>

    ; Construct a URL to upload to an object named "test.xml" in the "chilkat-ocean" bucket.
    CkHttp::ckSetUrlVar(http,"bucket_name","chilkat-ocean")
    CkHttp::ckSetUrlVar(http,"object_name","test.xml")
    url.s = "https://www.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=media&name={$object_name}"

    ; Note: The PTextSb method first appears in Chilkat v9.5.0.69
    resp.i = CkHttp::ckPTextSb(http,"POST",url,sbXml,"utf-8","application/xml",0,0)
    If CkHttp::ckLastMethodSuccess(http) = 0
        Debug CkHttp::ckLastErrorText(http)
        CkStringBuilder::ckDispose(sbToken)
        CkHttp::ckDispose(http)
        CkXml::ckDispose(xml)
        CkStringBuilder::ckDispose(sbXml)
        ProcedureReturn
    EndIf

    responseCode.i = CkHttpResponse::ckStatusCode(resp)
    If responseCode = 401
        Debug CkHttpResponse::ckBodyStr(resp)
        Debug "If invalid credentials, then it is likely the access token expired."
        Debug "Your app should automatically fetch a new access token and re-try."
        CkHttpResponse::ckDispose(resp)

        CkStringBuilder::ckDispose(sbToken)
        CkHttp::ckDispose(http)
        CkXml::ckDispose(xml)
        CkStringBuilder::ckDispose(sbXml)
        ProcedureReturn
    EndIf

    Debug "Response code: " + Str(responseCode)
    Debug "Response body"
    Debug CkHttpResponse::ckBodyStr(resp)

    ; A successful response looks like this:
    ; Response code: 200
    ; Response body
    ; {
    ;  "kind": "storage#object",
    ;  "id": "chilkat-ocean/test.xml/1502669565429870",
    ;  "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/test.xml",
    ;  "name": "test.xml",
    ;  "bucket": "chilkat-ocean",
    ;  "generation": "1502669565429870",
    ;  "metageneration": "1",
    ;  "contentType": "application/xml",
    ;  "timeCreated": "2017-08-14T00:12:45.379Z",
    ;  "updated": "2017-08-14T00:12:45.379Z",
    ;  "storageClass": "MULTI_REGIONAL",
    ;  "timeStorageClassUpdated": "2017-08-14T00:12:45.379Z",
    ;  "size": "181",
    ;  "md5Hash": "TCR0L7TWsw2TzOvfNvgEfA==",
    ;  "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/test.xml?generation=1502669565429870&alt=media",
    ;  "crc32c": "ZFd5sA==",
    ;  "etag": "CO6Qpq241dUCEAE="
    ; }

    CkHttpResponse::ckDispose(resp)



    CkStringBuilder::ckDispose(sbToken)
    CkHttp::ckDispose(http)
    CkXml::ckDispose(xml)
    CkStringBuilder::ckDispose(sbXml)


    ProcedureReturn
EndProcedure