Ruby Google Drive: Export File to Requested MIME Type (Export to PDF)

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Exports a Google Doc to the requested MIME type and returns the exported content. Please note that the exported content is limited to 10MB.
(Export only supports Google Docs) See https://developers.google.com/drive/v3/web/manage-downloads for a list of MIME types.

Documentation: https://developers.google.com/drive/v3/reference/files/export


require 'chilkat'

rest = Chilkat::CkRest.new()

#   Provide a previously obtained OAuth2 access token.
oauth2 = Chilkat::CkOAuth2.new()
oauth2.put_AccessToken("OAUTH2_ACCESS_TOKEN")
rest.SetAuthOAuth2(oauth2)

success = rest.Connect("www.googleapis.com",443,true,true)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

rest.AddQueryParam("mimeType","application/pdf")

#  First send the HTTP request.
success = rest.SendReqNoBody("GET","/drive/v3/files/1zvzpTHO1dM9vNKYxpmr4YrX7x_R6qiNGFb8WB8h9wuI/export")
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

#  Read the response header.  If the response status code is success, stream to the file.
#  Otherwise receive the error response text.
statusCode = rest.ReadResponseHeader()
if (statusCode < 0)
    print rest.lastErrorText() + "\n";
    exit
end

if (statusCode != 200)
    print "Received error response code: " + statusCode.to_s() + "\n";
    #  Read the error response body.
    sbErrResponse = Chilkat::CkStringBuilder.new()
    success = rest.ReadRespSb(sbErrResponse)
    if (success != true)
        print rest.lastErrorText() + "\n";
        exit
    end

    print "Error response:" + sbErrResponse.getAsString() + "\n";
    exit
end

#  Stream the response body to the output file.
respBodyStream = Chilkat::CkStream.new()
respBodyStream.put_SinkFile("/someDirectoryPath/test.pdf")
success = rest.ReadRespBodyStream(respBodyStream,true)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

print "Example Completed." + "\n";