Ruby Google Drive: Download a File (Stream to the Filesystem)

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Downloads the content of a file by ID. (In this example the file id = 1R_70heIyzIAu1_u0prXbYcaIiJRVkgBl) The file is streamed directly to the filesystem. Note: The alt=media query param must be used to download the file content (as opposed to the file metadata).

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

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("includeTeamDriveItems","true")
rest.AddQueryParam("supportsTeamDrives","true")
rest.AddQueryParam("alt","media")

#  First send the HTTP request.
success = rest.SendReqNoBody("GET","/drive/v3/files/1R_70heIyzIAu1_u0prXbYcaIiJRVkgBl")
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("/someDirectory/penguins.jpg")
success = rest.ReadRespBodyStream(respBodyStream,true)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

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