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feat(pdf-tools): add remove-restrictions tool for unlocking pdfs

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Implement new feature to remove security restrictions from PDFs including password protection and digital signature limitations. The tool allows users to unlock PDFs they have legitimate access to for editing and printing purposes. Includes UI components, error handling, and legal disclaimer about proper usage.
This commit is contained in:
abdullahalam123
2025-10-24 13:42:09 +05:30
parent e3468e3aaa
commit ba20536436
10 changed files with 234 additions and 68 deletions
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100
src/js/logic/change-permissions.ts
View File

@@ -1,18 +1,22 @@
import { showLoader, hideLoader, showAlert } from '../ui.js';
import { downloadFile, initializeQpdf, readFileAsArrayBuffer } from '../utils/helpers.js';
import {
downloadFile,
initializeQpdf,
readFileAsArrayBuffer,
} from '../utils/helpers.js';
import { state } from '../state.js';
export async function changePermissions() {
const file = state.files[0];
const currentPassword = (
document.getElementById('current-password') as HTMLInputElement
)?.value || '';
const newUserPassword = (
document.getElementById('new-user-password') as HTMLInputElement
)?.value || '';
const newOwnerPassword = (
document.getElementById('new-owner-password') as HTMLInputElement
)?.value || '';
const currentPassword =
(document.getElementById('current-password') as HTMLInputElement)?.value ||
'';
const newUserPassword =
(document.getElementById('new-user-password') as HTMLInputElement)?.value ||
'';
const newOwnerPassword =
(document.getElementById('new-owner-password') as HTMLInputElement)
?.value || '';
const inputPath = '/input.pdf';
const outputPath = '/output.pdf';
@@ -37,21 +41,34 @@ export async function changePermissions() {
}
const shouldEncrypt = newUserPassword || newOwnerPassword;
if (shouldEncrypt) {
const finalUserPassword = newUserPassword;
const finalOwnerPassword = newOwnerPassword;
args.push('--encrypt', finalUserPassword, finalOwnerPassword, '256');
// Get permission checkboxes
const allowPrinting = (document.getElementById('allow-printing') as HTMLInputElement)?.checked;
const allowCopying = (document.getElementById('allow-copying') as HTMLInputElement)?.checked;
const allowModifying = (document.getElementById('allow-modifying') as HTMLInputElement)?.checked;
const allowAnnotating = (document.getElementById('allow-annotating') as HTMLInputElement)?.checked;
const allowFillingForms = (document.getElementById('allow-filling-forms') as HTMLInputElement)?.checked;
const allowDocumentAssembly = (document.getElementById('allow-document-assembly') as HTMLInputElement)?.checked;
const allowPageExtraction = (document.getElementById('allow-page-extraction') as HTMLInputElement)?.checked;
const allowPrinting = (
document.getElementById('allow-printing') as HTMLInputElement
)?.checked;
const allowCopying = (
document.getElementById('allow-copying') as HTMLInputElement
)?.checked;
const allowModifying = (
document.getElementById('allow-modifying') as HTMLInputElement
)?.checked;
const allowAnnotating = (
document.getElementById('allow-annotating') as HTMLInputElement
)?.checked;
const allowFillingForms = (
document.getElementById('allow-filling-forms') as HTMLInputElement
)?.checked;
const allowDocumentAssembly = (
document.getElementById('allow-document-assembly') as HTMLInputElement
)?.checked;
const allowPageExtraction = (
document.getElementById('allow-page-extraction') as HTMLInputElement
)?.checked;
if (finalOwnerPassword) {
if (!allowModifying) args.push('--modify=none');
@@ -71,28 +88,28 @@ export async function changePermissions() {
}
args.push('--', outputPath);
console.log('qpdf args:', args);
try {
qpdf.callMain(args);
} catch (qpdfError: any) {
console.error('qpdf execution error:', qpdfError);
// Check for various password-related errors
const errorMsg = qpdfError.message || '';
if (errorMsg.includes('invalid password') ||
errorMsg.includes('incorrect password') ||
errorMsg.includes('password')) {
if (
errorMsg.includes('invalid password') ||
errorMsg.includes('incorrect password') ||
errorMsg.includes('password')
) {
throw new Error('INVALID_PASSWORD');
}
if (errorMsg.includes('encrypted') ||
errorMsg.includes('password required')) {
if (
errorMsg.includes('encrypted') ||
errorMsg.includes('password required')
) {
throw new Error('PASSWORD_REQUIRED');
}
throw new Error('Processing failed: ' + errorMsg || 'Unknown error');
}
@@ -107,17 +124,18 @@ export async function changePermissions() {
downloadFile(blob, `permissions-changed-${file.name}`);
hideLoader();
let successMessage = 'PDF permissions changed successfully!';
if (!shouldEncrypt) {
successMessage = 'PDF decrypted successfully! All encryption and restrictions removed.';
successMessage =
'PDF decrypted successfully! All encryption and restrictions removed.';
}
showAlert('Success', successMessage);
} catch (error: any) {
console.error('Error during PDF permission change:', error);
hideLoader();
if (error.message === 'INVALID_PASSWORD') {
showAlert(
'Incorrect Password',
@@ -139,17 +157,13 @@ export async function changePermissions() {
if (qpdf?.FS) {
try {
qpdf.FS.unlink(inputPath);
} catch (e) {
}
} catch (e) {}
try {
qpdf.FS.unlink(outputPath);
} catch (e) {
}
} catch (e) {}
}
} catch (cleanupError) {
console.warn('Failed to cleanup WASM FS:', cleanupError);
}
}
}
}

6
src/js/logic/decrypt.ts
View File

@@ -1,5 +1,9 @@
import { showLoader, hideLoader, showAlert } from '../ui.js';
import { downloadFile, initializeQpdf, readFileAsArrayBuffer } from '../utils/helpers.js';
import {
downloadFile,
initializeQpdf,
readFileAsArrayBuffer,
} from '../utils/helpers.js';
import { state } from '../state.js';
export async function decrypt() {

32
src/js/logic/encrypt.ts
View File

@@ -1,5 +1,9 @@
import { showLoader, hideLoader, showAlert } from '../ui.js';
import { downloadFile, initializeQpdf, readFileAsArrayBuffer } from '../utils/helpers.js';
import {
downloadFile,
initializeQpdf,
readFileAsArrayBuffer,
} from '../utils/helpers.js';
import { state } from '../state.js';
export async function encrypt() {
@@ -35,32 +39,24 @@ export async function encrypt() {
showLoader('Encrypting PDF with 256-bit AES...');
const args = [
inputPath,
'--encrypt',
userPassword,
ownerPassword,
'256',
];
const args = [inputPath, '--encrypt', userPassword, ownerPassword, '256'];
// Only add restrictions if a distinct owner password was provided
if (hasDistinctOwnerPassword) {
args.push(
'--modify=none',
'--extract=n',
'--print=none',
'--accessibility=n',
'--annotate=n',
'--assemble=n',
'--form=n',
'--modify-other=n',
'--extract=n',
'--print=none',
'--accessibility=n',
'--annotate=n',
'--assemble=n',
'--form=n',
'--modify-other=n'
);
}
args.push('--', outputPath);
console.log(args);
try {
qpdf.callMain(args);
} catch (qpdfError: any) {
@@ -114,4 +110,4 @@ export async function encrypt() {
console.warn('Failed to cleanup WASM FS:', cleanupError);
}
}
}
}

2
src/js/logic/index.ts
View File

@@ -64,12 +64,14 @@ import { alternateMerge, setupAlternateMergeTool } from './alternate-merge.js';
import { linearizePdf } from './linearize.js';
import { addAttachments, setupAddAttachmentsTool } from './add-attachments.js';
import { sanitizePdf } from './sanitize-pdf.js';
import { removeRestrictions } from './remove-restrictions.js';
export const toolLogic = {
merge: { process: merge, setup: setupMergeTool },
split: { process: split, setup: setupSplitTool },
encrypt,
decrypt,
'remove-restrictions': removeRestrictions,
organize,
rotate,
'add-page-numbers': addPageNumbers,

99
src/js/logic/remove-restrictions.ts Normal file
View File

@@ -0,0 +1,99 @@
import { showLoader, hideLoader, showAlert } from '../ui.js';
import {
downloadFile,
initializeQpdf,
readFileAsArrayBuffer,
} from '../utils/helpers.js';
import { state } from '../state.js';
export async function removeRestrictions() {
const file = state.files[0];
const password =
(document.getElementById('owner-password-remove') as HTMLInputElement)
?.value || '';
const inputPath = '/input.pdf';
const outputPath = '/output.pdf';
let qpdf: any;
try {
showLoader('Initializing...');
qpdf = await initializeQpdf();
showLoader('Reading PDF...');
const fileBuffer = await readFileAsArrayBuffer(file);
const uint8Array = new Uint8Array(fileBuffer as ArrayBuffer);
qpdf.FS.writeFile(inputPath, uint8Array);
showLoader('Removing restrictions...');
const args = [inputPath];
if (password) {
args.push(`--password=${password}`);
}
args.push('--decrypt', '--remove-restrictions', '--', outputPath);
try {
qpdf.callMain(args);
} catch (qpdfError: any) {
console.error('qpdf execution error:', qpdfError);
if (
qpdfError.message?.includes('password') ||
qpdfError.message?.includes('encrypt')
) {
throw new Error(
'Failed to remove restrictions. The PDF may require the correct owner password.'
);
}
throw new Error(
'Failed to remove restrictions: ' +
(qpdfError.message || 'Unknown error')
);
}
showLoader('Preparing download...');
const outputFile = qpdf.FS.readFile(outputPath, { encoding: 'binary' });
if (!outputFile || outputFile.length === 0) {
throw new Error('Operation resulted in an empty file.');
}
const blob = new Blob([outputFile], { type: 'application/pdf' });
downloadFile(blob, `unrestricted-${file.name}`);
hideLoader();
showAlert(
'Success',
'PDF restrictions removed successfully! The file is now fully editable and printable.'
);
} catch (error: any) {
console.error('Error during restriction removal:', error);
hideLoader();
showAlert(
'Operation Failed',
`An error occurred: ${error.message || 'The PDF might be corrupted or password-protected.'}`
);
} finally {
try {
if (qpdf?.FS) {
try {
qpdf.FS.unlink(inputPath);
} catch (e) {
console.warn('Failed to unlink input file:', e);
}
try {
qpdf.FS.unlink(outputPath);
} catch (e) {
console.warn('Failed to unlink output file:', e);
}
}
} catch (cleanupError) {
console.warn('Failed to cleanup WASM FS:', cleanupError);
}
}
}