PDF.co Web API – Barcode Reader API – JavaScript – Read Barcode From Uploaded File (Node.js) – Async Api

PDF.co Web API – Barcode Reader API – JavaScript – Read Barcode From Uploaded File (Node.js) – Async Api

ReadBarcodeFromUploadedFile.js

/*jshint esversion: 6 */

var https = require("https");
var path = require("path");
var fs = require("fs");

// `request` module is required for file upload.
// Use "npm install request" command to install.
var request = require("request");

// The authentication key (API Key).
// Get your own by registering at https://app.pdf.co/documentation/api
const API_KEY = "***********************************";


// Source file name
const SourceFile = "./sample.pdf";
// Comma-separated list of barcode types to search. 
// See valid barcode types in the documentation https://app.pdf.co/documentation/api/1.0/barcode/read_from_url.html
const BarcodeTypes = "Code128,Code39,Interleaved2of5,EAN13";
// Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
const Pages = "";


// 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.
getPresignedUrl(API_KEY, SourceFile)
.then(([uploadUrl, uploadedFileUrl]) => {
    // 2. UPLOAD THE FILE TO CLOUD.
    uploadFile(API_KEY, SourceFile, uploadUrl)
    .then(() => {
        // 3. READ BARCODES FROM UPLOADED FILE
        readBarcodes(API_KEY, uploadedFileUrl, Pages, BarcodeTypes);
    })
    .catch(e => {
        console.log(e);
    });
})
.catch(e => {
    console.log(e);
});


function getPresignedUrl(apiKey, localFile) {
    return new Promise(resolve => {
        // Prepare request to `Get Presigned URL` API endpoint
        let queryPath = `/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name=${path.basename(SourceFile)}`;
        let reqOptions = {
            host: "api.pdf.co",
            path: encodeURI(queryPath),
            headers: { "x-api-key": API_KEY }
        };
        // Send request
        https.get(reqOptions, (response) => {
            response.on("data", (d) => {
                let data = JSON.parse(d);
                if (data.error == false) {
                    // Return presigned url we received
                    resolve([data.presignedUrl, data.url]);
                }
                else {
                    // Service reported error
                    console.log("getPresignedUrl(): " + data.message);
                }
            });
        })
        .on("error", (e) => {
            // Request error
            console.log("getPresignedUrl(): " + e);
        });
    });
}

function uploadFile(apiKey, localFile, uploadUrl) {
    return new Promise(resolve => {
        fs.readFile(SourceFile, (err, data) => {
            request({
                method: "PUT",
                url: uploadUrl,
                body: data,
                headers: {
                    "Content-Type": "application/octet-stream"
                }
            }, (err, res, body) => {
                if (!err) {
                    resolve();
                }
                else {
                    console.log("uploadFile() request error: " + e);
                }
            });
        });
    });
}

function readBarcodes(apiKey, uploadedFileUrl, pages, barcodeTypes) {
    // Prepare request to `Barcode Reader` API endpoint
    let queryPath = `/v1/barcode/read/from/url?types=${BarcodeTypes}&pages=${Pages}&url=${uploadedFileUrl}&async=True`;
    let reqOptions = {
        host: "api.pdf.co",
        path: encodeURI(queryPath),
        method: "GET",
        headers: { "x-api-key": API_KEY }
    };
    // Send request
    https.get(reqOptions, (response) => {
        response.on("data", (d) => {
            response.setEncoding("utf8");
            // Parse JSON response
            let data = JSON.parse(d);
            if (data.error == false) {
                checkIfJobIsCompleted(data.jobId, data.url);
            }
            else {
                // Service reported error
                console.log("readBarcodes(): " + data.message);
            }
        });
    })
    .on("error", (e) => {
        // Request error
        console.log("readBarcodes(): " + e);
    });
}

function checkIfJobIsCompleted(jobId, resultFileUrlJson) {
    let queryPath = `/v1/job/check?jobid=${jobId}`;
    let reqOptions = {
        host: "api.pdf.co",
        path: encodeURI(queryPath),
        method: "GET",
        headers: { "x-api-key": API_KEY }
    };

    https.get(reqOptions, (response) => {
        response.on("data", (d) => {
            response.setEncoding("utf8");
            // Parse JSON response
            let data = JSON.parse(d);
            if (data.Status == "InProgress") {
                // Check again after 2 seconds
				setTimeout(function(){ checkIfJobIsCompleted(jobId, resultFileUrlJson);}, 2000);
            }
            else if (data.Status == "Finished") {

                request({ method: 'GET', uri: resultFileUrlJson, gzip: true },
                function (error, response, body) {

                    //* workaround for issue with non supoprted firstchar code
                    var firstCharCode = body.charCodeAt(0);
                    if (firstCharCode == 65279) {
                        body = body.substring(1);
                    }

                    // Parse JSON response
                    let respJsonFileArray = JSON.parse(body);

                    respJsonFileArray.forEach((element) => {
                        console.log("Found barcode:");
                        console.log("  Type: " + element["TypeName"]);
                        console.log("  Value: " + element["Value"]);
                        console.log("  Document Page Index: " + element["Page"]);
                        console.log("  Rectangle: " + element["Rect"]);
                        console.log("  Confidence: " + element["Confidence"]);
                        console.log();
                    }, this);
                });
            }
            else {
                console.log(`Operation ended with status: "${data.Status}".`);
            }
        })
    });
}

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