This example is available in full on GitHub.Required npm Dependencies:
- fiftyone.pipeline.core
- fiftyone.pipeline.engines
- fiftyone.pipeline.engines.fiftyone
- fiftyone.devicedetection.onpremise
/* *********************************************************************
* This Original Work is copyright of 51 Degrees Mobile Experts Limited.
* Copyright 2025 51 Degrees Mobile Experts Limited, Davidson House,
* Forbury Square, Reading, Berkshire, United Kingdom RG1 3EU.
*
* This Original Work is licensed under the European Union Public Licence
* (EUPL) v.1.2 and is subject to its terms as set out below.
*
* If a copy of the EUPL was not distributed with this file, You can obtain
* one at https://opensource.org/licenses/EUPL-1.2.
*
* The 'Compatible Licences' set out in the Appendix to the EUPL (as may be
* amended by the European Commission) shall be deemed incompatible for
* the purposes of the Work and the provisions of the compatibility
* clause in Article 5 of the EUPL shall not apply.
*
* If using the Work as, or as part of, a network application, by
* including the attribution notice(s) required under Article 5 of the EUPL
* in the end user terms of the application under an appropriate heading,
* such notice(s) shall fulfill the requirements of that article.
* ********************************************************************* */
const path = require('path');
const require51 = (requestedPackage) => {
try {
return require(path.join(__dirname, '/../../../node_modules/', requestedPackage));
} catch (e) {
return require(path.join(__dirname, '/../../../../', requestedPackage));
}
};
require51('fiftyone.devicedetection.onpremise').DeviceDetectionOnPremisePipelineBuilder;
const exampleConstants = require51('fiftyone.devicedetection.shared').exampleConstants;
// In this example, by default, the 51degrees "Lite" file needs to be in the
// fiftyone.devicedetection.onpremise/device-detection-cxx/device-detection-data,
// or you may specify another file as a command line parameter.
//
// Note that the Lite data file is only used for illustration, and has
// limited accuracy and capabilities.
// Find out about the Enterprise data file on our pricing page:
// https://51degrees.com/pricing
const LITE_V_4_1_HASH = '51Degrees-LiteV4.1.hash';
const outputValue = function (name, value) {
// Individual result values have a wrapper called
// `AspectPropertyValue`. This functions similarly to
// a null-able type.
// If the value has not been set then trying to access the
// `value` property will throw an exception.
// `AspectPropertyValue` also includes the `noValueMessage`
// property, which describes why the value has not been set.
return `\n\t${name}: ${value}`;
};
const analyse = async function (evidence, pipeline, output) {
// FlowData is a data structure that is used to convey
// information required for detection and the results of the
// detection through the pipeline.
// Information required for detection is called "evidence"
// and usually consists of a number of HTTP Header field
// values, in this case represented by a
// Object of header name/value entries.
// list the evidence
let message = 'Input values:';
for (const [key, value] of evidence) {
message += `\n\t${key}: ${value}`;
}
output.write(message + '\n');
const data = pipeline.createFlowData();
// Add the evidence values to the flow data
evidence.forEach((value, key, map) => {
data.evidence.add(key, value);
});
await data.process();
message = 'Results:';
// Now that it's been processed, the flow data will have
// been populated with the result. In this case, we want
// information about the device, which we can get by
// asking for the 'device' data.
const device = data.device;
// Display the results of the detection, which are called
// device properties. See the property dictionary at
// https://51degrees.com/developers/property-dictionary
// for details of all available properties.
message += outputValue('Platform Version', DataExtension.getValueHelper(device, 'platformversion'));
message += '\n\n';
output.write(message);
};
const run = async function (dataFile, output) {
// In this example, we use the DeviceDetectionOnPremisePipelineBuilder
// and configure it in code. For more information about
// pipelines in general see the documentation at
// https://51degrees.com/documentation/_concepts__configuration__builders__index.html
dataFile,
// We use the low memory profile as its performance is
// sufficient for this example. See the documentation for
// more detail on this and other configuration options:
// https://51degrees.com/documentation/_device_detection__features__performance_options.html
// https://51degrees.com/documentation/_features__automatic_datafile_updates.html
// https://51degrees.com/documentation/_features__usage_sharing.html
performanceProfile: 'LowMemory',
// inhibit sharing usage for this test, usually this
// should be set 'true'
shareUsage: false,
// inhibit auto-update of the data file for this test
autoUpdate: false,
updateOnStart: false,
fileSystemWatcher: false
}).build();
// carry out some sample detections
for (const values of exampleConstants.defaultEvidenceValues) {
await analyse(values, pipeline, output);
}
ExampleUtils.checkDataFile(pipeline, dataFile);
};
// Don't run the server if under TEST
if (process.env.JEST_WORKER_ID === undefined) {
const args = process.argv.slice(2);
// Use the supplied path for the data file or find the lite
// file that is included in the repository.
if (dataFile !== undefined) {
run(dataFile, process.stdout);
} else {
console.error('Failed to find a device detection ' +
'data file. Make sure the device-detection-data ' +
'submodule has been updated by running ' +
'`git submodule update --recursive`.');
}
};
module.exports = {
run
};