This example is available in full on GitHub.Required npm Dependencies:
- fiftyone.pipeline.core
- fiftyone.pipeline.engines
- fiftyone.pipeline.engines.fiftyone
- fiftyone.devicedetection.onpremise
Overview
The flowData.evidence.addFromRequest(request) is used to extract required evidence from a Http request. The Helpers.setResponseHeaders(response, flowData) from fiftyone.pipeline.core package is used to add extra headers to a Http response to request further evidence from the client.
flowData.evidence.addFromRequest(request);
core.Helpers.setResponseHeaders(response, flowData);
The results of detection can be accessed by querying the device property of a FlowData object. This can then be used to interrogate the data.
var flowData = pipeline.createFlowData();
var deviceData = pipeline.device;
var hardwareVendor = deviceData.hardwarevendor;
Results can also be accessed in client-side code by using the fod object. See the JavaScriptBuilderElement for details on available settings such as changing the fod name.
window.onload = function () {
fod.complete(function(data) {
var hardwareName = data.device.hardwarename;
alert(hardwareName.join(", "));
}
}
/* *********************************************************************
* 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.
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const path = require('path');
const require51 = (requestedPackage) => {
try {
return require(path.join(__dirname, '/../../../node_modules/', requestedPackage));
} catch (e) {
return require(path.join(__dirname, '/../../../../', requestedPackage));
}
};
const fs = require('fs');
const http = require('http');
const pug = require('pug');
const compiledFunction =
pug.compileFile(path.join(__dirname, '/index.pug'));
const core = require51('fiftyone.pipeline.core');
const optionsExtension =
require51('fiftyone.devicedetection.shared').optionsExtension;
const dataExtension =
require51('fiftyone.devicedetection.shared').dataExtension;
require(path.join(__dirname, '/../exampleUtils'));
// Pipeline variable to be used
let pipeline;
const setPipeline = (options) => {
const dataFilePath = optionsExtension.getDataFilePath(options);
if (!dataFilePath) {
throw 'A data file must be specified in the 51d.json file.';
}
if (!fs.existsSync(dataFilePath)) {
if (newDataFilePath !== undefined) {
optionsExtension.setDataFilePath(options, newDataFilePath);
console.warn('Failed to find a device detection data file at ' +
`at the specified path '${dataFilePath}'. Use '${newDataFilePath}' ` +
'instead.');
} else {
throw 'Failed to find a device detection data file at ' +
`'${dataFilePath}'. If using the lite file, then make sure the ` +
'device-detection-data submodule has been updated by running ' +
'\'git submodule update --recursive\'. Otherwise, ensure that the ' +
'filename is correct in 51d.json.';
}
}
pipeline = new core.PipelineBuilder({
// Enable custom javascript builder
addJavaScriptBuilder: true,
// Settings for javascript builder
javascriptBuilderSettings: {
// Custom endpoint to report client-side evidence
endPoint: '/json'
}
}).buildFromConfiguration(options);
// Logging of errors and other messages.
// Valid logs types are info, debug, warn, error
pipeline.on('error', console.error);
};
const server = http.createServer((req, res) => {
// 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.
const flowData = pipeline.createFlowData();
// Extract required evidence from the Http request.
flowData.evidence.addFromRequest(req);
// Handle report from client side separately
if (req.url.startsWith('/json')) {
flowData.process().then(function () {
res.statusCode = 200;
res.setHeader('Content-Type', 'application/json');
res.end(JSON.stringify(flowData.jsonbundler.json));
});
} else {
flowData.process().then(function () {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/html');
// Some browsers require that extra HTTP headers are explicitly
// requested. So set whatever headers are required by the browser in
// order to return the evidence needed by the pipeline.
// More info on this can be found at
// https://51degrees.com/blog/user-agent-client-hints
core.Helpers.setResponseHeaders(res, flowData);
// Obtain all used evidence
const allEvidence = flowData.evidence.getAll();
const evidences =
pipeline.getElement('device').evidenceKeyFilter.filterEvidence(
allEvidence);
// Compile a response
res.end(compiledFunction(
{
dataFilePublishedTime: new Date().getTime(),
dataFileAgeWarning: DATA_FILE_AGE_WARNING,
responseHeaders: res.getHeaders(),
evidenceUsed: evidences,
allEvidence,
dataSourceTier: ExampleUtils.getDataTier(pipeline),
fiftyOneJs: flowData.javascriptbuilder.javascript,
hardwareVendor: dataExtension.getValueHelper(flowData.device, 'hardwarevendor'),
hardwareName: dataExtension.getValueHelper(flowData.device, 'hardwarename'),
deviceType: dataExtension.getValueHelper(flowData.device, 'devicetype'),
platformVendor: dataExtension.getValueHelper(flowData.device, 'platformvendor'),
platformName: dataExtension.getValueHelper(flowData.device, 'platformname'),
platformVersion: dataExtension.getValueHelper(flowData.device, 'platformversion'),
browserVendor: dataExtension.getValueHelper(flowData.device, 'browservendor'),
browserName: dataExtension.getValueHelper(flowData.device, 'browsername'),
browserVersion: dataExtension.getValueHelper(flowData.device, 'browserversion'),
screenWidth: dataExtension.getValueHelper(flowData.device, 'screenpixelswidth'),
screenHeight: dataExtension.getValueHelper(flowData.device, 'screenpixelsheight')
})
);
});
}
});
// Don't run the server if under TEST
if (process.env.JEST_WORKER_ID === undefined) {
// Load the configuration options from config file.
const options = JSON.parse(fs.readFileSync(path.join(__dirname, '/51d.json')));
setPipeline(options);
const port = 3001;
const hostname = 'localhost';
server.listen(port, hostname);
console.log(`Server listening on: http://${hostname}:${port}`);
};
// Export server object and set pipeline.
module.exports = {
server,
setPipeline
};