Security News
The Dark Side of Open Source
At Node Congress, Socket CEO Feross Aboukhadijeh uncovers the darker aspects of open source, where applications that rely heavily on third-party dependencies can be exploited in supply chain attacks.
pdf-stream
Advanced tools
Readme
Creates a stream from PDF
Node.js module for streaming PDF text content.
Based on PDF.js library.
npm i pdf-stream --save
'use strict';
const text = require('pdf-stream').text;
// Load file contents to ArrayBuffer synchronously
let file = './example.pdf';
let pdf = new Uint8Array(fs.readFileSync(file));
// Stream PDF text to stdout
text(pdf)
.pipe(process.stdout);
You need the XMLHttpRequest
as global variable.
Install the xhr2 library locally:
npm i xhr2 --save
'use strict';
const text = require('pdf-stream').text;
global.XMLHttpRequest = require('xhr2'); // for PDFJS
let pdf = 'https://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf';
text(pdf)
.pipe(process.stdout);
If you got error:
ReferenceError: DOMParser is not defined
You need the DOMParser
as global variable, because PDF.js use it for XML metadata parsing. Install the xmldom library locally:
npm i xmldom --save
'use strict';
const text = require('pdf-stream').text;
global.XMLHttpRequest = require('xhr2'); // File download
global.DOMParser = require('xmldom').DOMParser; // XML Metadata parsing
let pdf = 'https://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf';
text(pdf)
.pipe(process.stdout);
'use strict';
const Transform = require('stream').Transform;
const pdf_stream = require('pdf-stream');
const PDFReadable = pdf_stream.PDFReadable;
const PDFStringifyTransform = pdf_stream.PDFStringifyTransform;
let url = 'https://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf';
// Transform class for replacing strings
class ReplaceTransform extends Transform {
constructor(options) {
super({
writableObjectMode: true,
readableObjectMode: true
});
this.from = options.from;
this.to = options.to;
}
// For every object
_transform(obj, encoding, cb) {
// Get text content items
if (typeof obj.textContent !== 'undefined'
&& Array.isArray(obj.textContent.items)) {
obj.textContent.items.forEach((item, i) => {
// Working with the PDF.js `textContent` object
// Replace substring to another
obj.textContent.items[i].str = item.str.replace(this.from, this.to);
});
}
this.push(obj);
cb();
}
}
// Pipeline
new PDFReadable(url)
.pipe(new ReplaceTransform({
from: /trace/gi,
to: ':-)'
}))
.pipe(new PDFStringifyTransform()) // Convert stream from object to string
.pipe(process.stdout);
All methods are streams, use them with .pipe()
.
alternative usage:
text(pdf, whitespace)
Gets text stream from PDF.
Convert PDF to text, optionally can replace whitespaces.
Options:
pdf
— URL or ArrayBuffer;whitespace
— the string that replaces the whitespace ␣
. Replacement disabled by default.In the PDF.js viewer whitespaces is an empty string. For making output comparable with the viewer use:
text(pdf, '')
Return: {stream.Readable}
alternative usage:
new PDFReadable(pdf)
Making the Readable stream in object mode from PDF text content.
Options:
pdf
— URL or ArrayBuffer;stream.Readable
options.Return: {stream.Readable}
alternative usage:
new PDFStringifyTransform(whitespace)
Transform PDF text content object to string.
Options:
whitespace
— the string that replaces the whitespace ␣
. Replacement disabled by default;stream.Transform
options.Return: {stream.Readable}
Contributors are welcome. Open an issue or submit pull request.
Small note: If editing the README, please conform to the standard-readme specification.
Apache 2.0
© Sergey N
FAQs
Creates a stream from PDF
The npm package pdf-stream receives a total of 317 weekly downloads. As such, pdf-stream popularity was classified as not popular.
We found that pdf-stream demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
At Node Congress, Socket CEO Feross Aboukhadijeh uncovers the darker aspects of open source, where applications that rely heavily on third-party dependencies can be exploited in supply chain attacks.
Research
Security News
The Socket Research team found this npm package includes code for collecting sensitive developer information, including your operating system username, Git username, and Git email.
Security News
OpenJS is warning of social engineering takeovers targeting open source projects after receiving a credible attempt on the foundation.