(Unicode C++) eBay -- Download Data using FileTransferService

Demonstrates how to download a data file using the eBay File Transfer API.

Note: This example requires Chilkat v9.5.0.67 or later.

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#include <CkHttpW.h>
#include <CkHttpRequestW.h>
#include <CkXmlW.h>
#include <CkHttpResponseW.h>
#include <CkBinDataW.h>
#include <CkMimeW.h>
#include <CkStringBuilderW.h>
#include <CkGzipW.h>
#include <CkZipW.h>
#include <CkZipEntryW.h>

void ChilkatSample(void)
    {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Use a previously obtained access token.  The token should look something like this:
    // "AgAAAA**AQA ..."
    const wchar_t *accessToken = L"EBAY_ACCESS_TOKEN";

    CkHttpW http;

    CkHttpRequestW req;

    req.put_HttpVerb(L"POST");
    req.put_Path(L"/FileTransferService");
    req.put_ContentType(L"application/xml");

    // Build the XML body for the request.
    CkXmlW xml;
    xml.put_Tag(L"downloadFileRequest");
    xml.AddAttribute(L"xmlns",L"http://www.ebay.com/marketplace/services");
    xml.UpdateChildContent(L"taskReferenceId",L"50013004806");
    xml.UpdateChildContent(L"fileReferenceId",L"50015579016");

    req.LoadBodyFromString(xml.getXml(),L"utf-8");

    // The XML body looks like this:

    // 	<?xml version="1.0" encoding="UTF-8"?>
    // 	<downloadFileRequest xmlns="http://www.ebay.com/marketplace/services">
    // 	<taskReferenceId>50013004806</taskReferenceId>
    // 	<fileReferenceId>50015579016</fileReferenceId>
    // 	</downloadFileRequest>

    req.AddHeader(L"X-EBAY-SOA-OPERATION-NAME",L"downloadFile");
    req.AddHeader(L"X-EBAY-SOA-SECURITY-TOKEN",accessToken);

    CkHttpResponseW *resp = http.SynchronousRequest(L"storage.sandbox.ebay.com",443,true,req);
    if (http.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    int statusCode = resp->get_StatusCode();
    wprintf(L"Response status code = %d\n",statusCode);

    CkBinDataW responseBody;
    resp->GetBodyBd(responseBody);
    delete resp;

    // We can save the response body to a file for examination if we get an unanticipated response.  
    // (It's binary, so it won't open well in a text editor.)
    responseBody.WriteFile(L"qa_output/response.mime");

    if (statusCode != 200) {
        wprintf(L"Failed.\n");
        return;
    }

    // The response body looks like this:

    // 	--MIMEBoundaryurn_uuid_2B668636C1E17A4D4114925305818684241
    // 	Content-Type: application/xop+xml; charset=utf-8; type="text/xml"
    // 	Content-Transfer-Encoding: binary
    // 	Content-ID: <0.urn:uuid:2B668636C1E17A4D4114925305818684242>
    // 
    // 	<?xml version='1.0' encoding='UTF-8'?>
    // 	<downloadFileResponse xmlns="http://www.ebay.com/marketplace/services">
    // 	<ack>Success</ack>
    // 	<version>1.1.0</version>
    // 	<timestamp>2017-04-18T15:49:41.868Z</timestamp>
    // 	<fileAttachment>
    // 	    <Size>587</Size>
    // 	    <Data>
    //                 <xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:urn:uuid:A37C3C73E994C267F11492530585522"/>
    // 	    </Data>
    // 	</fileAttachment>
    // 	</downloadFileResponse>
    // 	--MIMEBoundaryurn_uuid_2B668636C1E17A4D4114925305818684241
    // 	Content-Type: application/zip
    // 	Content-Transfer-Encoding: binary
    // 	Content-ID: <urn:uuid:A37C3C73E994C267F11492530585522>
    // 
    // 	<the binary bytes of the zip start here...>
    // 

    // Load the binary response into a MIME object.
    CkMimeW mime;
    bool success = mime.LoadMimeBd(responseBody);
    if (success != true) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    // Make sure we have 2 sub-parts.  The 1st sub-part is the XML response, the 2nd sub-part
    // is the zip containing the data.

    // Note: The 2nd sub-part can be a "zip" or "gzip".  These are two different file formats.
    // A zip is indicated with a Content-Type header equal to "application/zip",
    // whereas a gzip is indicated with a Content-Type header equal to "application/x-gzip"
    if (mime.get_NumParts() != 2) {
        wprintf(L"Expected the MIME to have 2 parts.\n");
        wprintf(L"NumParts = %d\n",mime.get_NumParts());
        wprintf(L"Failed.\n");
        return;
    }

    // Get the XML from the 1st MIME sub-part.
    CkMimeW *part0 = mime.GetPart(0);
    const wchar_t *downloadResponseXml = part0->getBodyDecoded();
    CkXmlW xmlResp;
    xmlResp.LoadXml(downloadResponseXml);
    wprintf(L"Download Response XML:\n");
    wprintf(L"%s\n",xmlResp.getXml());
    delete part0;

    wprintf(L"----\n");

    // Now get the zip from the second part (index=1), unzip, and examine..
    CkMimeW *part1 = mime.GetPart(1);
    CkBinDataW zipData;
    // This example requires Chilkat v9.5.0.67 or later.
    // The GetBodyBd method was added in v9.5.0.67.
    part1->GetBodyBd(zipData);

    // Check to see if we have a zip or gzip.
    CkStringBuilderW sbContentType;
    sbContentType.Append(part1->contentType());
    delete part1;

    CkXmlW xmlFromZip;

    if (sbContentType.Contains(L"gzip",false) == true) {
        // This is a gzip compressed file.
        CkGzipW gzip;

        // in-place uncompress the data.
        // Note: The UncompressBd method was added in Chilkat v9.5.0.67
        success = gzip.UncompressBd(zipData);
        if (success != true) {
            wprintf(L"%s\n",gzip.lastErrorText());
            return;
        }

        xmlFromZip.LoadXml(zipData.getString(L"utf-8"));

    }
    else {
        // This is a zip archive.

        // Load the body into a Zip object.
        CkZipW zip;
        success = zip.OpenBd(zipData);
        if (success != true) {
            wprintf(L"%s\n",zip.lastErrorText());
            return;
        }

        // Save the .zip to a file (so we can examine it for debugging if something is not as expected)
        zipData.WriteFile(L"qa_output/ebay_data.zip");

        // The zip should contain a single XML file.
        if (zip.get_NumEntries() != 1) {
            wprintf(L"Expected the .zip to have 1 entry.\n");
            wprintf(L"NumEntries = %d\n",zip.get_NumEntries());
            wprintf(L"Failed.\n");
            return;
        }

        CkZipEntryW *entry = zip.GetEntryByIndex(0);

        xmlFromZip.LoadXml(entry->unzipToString(0,L"utf-8"));
        delete entry;
    }

    wprintf(L"XML contained in the zip:\n");
    wprintf(L"%s\n",xmlFromZip.getXml());
    wprintf(L"----\n");

    wprintf(L"Success.\n");
    }