myspdf v0.1.2

is ?

Digital signatures of PDF and Encrypt/Decrypt PDF, on JavaScript.

Notice

This library override pdf-lib some functions. Maybe comatible with original ,but not limited to the warranties. Using "@ts-ignore" to access pdf-lib private properties | functions, which may not fit your policy. Not adequately tested,"NOT LIMITED TO THE WARRANTIES"

Thanks

The issue post at pdf-lib on how to sign was helpful. PR#1015 on pdf-lib about encryption was helpful.

Usage

pdfSigner Class

import {pdfSigner} from "spdf";
const signer = new pdfSigner();

Member

• New Sign
• Add Sign
• Add TimeStamp
• Add DSS
• ADD LastTimeStamp-DSS

Global

import {decryptPDF, encryptPDF} from "spdf";

Member

• encryptPDF
• decryptPDF

newSign

• Create a signed PDF.

pdfSigner.newSing: (pdf:string | Uint8Array | ArrayBuffer, certs: CERTIFICATEs, options?: newSignOptions) => Promise<Uint8Array>

CERTIFICATEs

Import Certificate and Key is dependency on jsrsasign,Support format look jsrsasign reference.

newSignOptions

The value of DocMDP is quoted to the ISO-32000-1. 1.No changes to the document shall be permitted; any change to the document shall invalidate the signature.2.Permitted changes shall be filling in forms, instantiating page templates, and signing; other changes shall invalidate the signature.3.Permitted changes shall be the same as for 2, as well as annotation creation, deletion, and modification; other changes shall invalidate the signature.

EncryptOptions

see

SignerOptions

signature

Visible signature.

RECT

SignText

TSASarver

Not available in web browsers due to CORS.

• Allocate Size PDF signatures must be pre-allocated space. The size of the space is estimated from the certificate and allocated, but the timestamp cannot check the size of the certificate in advance. If there is not enough space, the timestamp will be set to a sufficient size based on the results obtained once, but it will need to be signed again. In other words, if there is not enough space, the timestamping will be requested twice. If the area is large enough, it cannot be reduced.

Add sign

• Add(inculumental) a signature. Add a new signature without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained.

pdfSigner.pdfSigner.inculumentalSign: (pdf:string | Uint8Array | ArrayBuffer, certs: CERTIFICATEs, options?: inclumentalSignOptions) => Promise<Uint8Array>

CERTIFICATEs

See

inclumentalSignOptions

Add TimeStamp

• Add(inculumental) a Timestamp. Add a new timestamp without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained.

pdfSigner.inculumentalTimeStamp: (pdf:string | Uint8Array | ArrayBuffer, tsaPram: timeStampOptions) => Promise<Uint8Array>

timeStampOptions

Add DSS

• Add(inculumental) a DSS. Embeds the verification information of the currently embedded certificate. Add a DSS without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained. Simply, it enables LTV. Processes all signatures, if you have already embedded the DSS, you will need to embed the DSS for the added timestamp only. See ADD LastTimeStamp-DSS

pdfSigner.addDSSAllCerts: (pdf:string | Uint8Array | ArrayBuffer, options?: addDssOptions) => Promise<Uint8Array>

addDssOptions

To obtain verification information, CRLs are obtained, OCSP queries are made, and CA certificates are acquired. Not available in web browsers due to CORS.

ADD LastTimeStamp-DSS

• Add(inculumental) a LastTimeStamp-DSS. Embeds the verification information of the currently embedded certificate. Add a DSS without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained. Simply, Extended document Time-stamp.

pdfSigner.addDSSLastTimeStamp: (pdf:string | Uint8Array | ArrayBuffer, options?: addDssOptions) => Promise<Uint8Array>

addDssOptions

see

encryptPDF

const encryptPDF: (pdf: string | Uint8Array | ArrayBuffer, encryptOptions: encryptOptions) => Promise<Uint8Array>

encryptOptions

UserPermission

UserPermission default all deny. | Name | Type | Attribute | Description | | --- | --- | --- | --- | | printing | false|'lowResolution' | 'highResolution' | Optional | Printing Permission | | modifying | boolean | Optional | Modify Content Permission | | copying | boolean | Optional | Copy or otherwise extract text and graphics from document | | annotating | boolean | Optional | Permission to add or modify text annotations | | fillingForms | boolean | Optional | Fill in existing interactive form fields (including signature fields) | | contentAccessibility | boolean | Optional | Extract text and graphics (in support of accessibility to users with disabilities or for other purposes) | | documentAssembly | boolean | Optional | Assemble the document (insert, rotate or delete pages and create bookmarks or thumbnail images) |

decryptPDF

decryptPDF: (pdf: string | Uint8Array | ArrayBuffer, ownerPassword: string) => Promise<Uint8Array>

Use pdf-lib with encryption support.

Import "PDFDocument" from 'pdf-lib_patch' instead of 'pdf-lib'.

exsample

This then,is

import { PDFDocument, rgb} from "pdf-lib";
const pdfData = await PDFDocument.load(readFileSync("input.pdf"));
const page1 = pdfData.getPage(0);
page1.drawCircle({ "opacity":1, x:100, y:740,size:100,color:rgb(0.8,0.2,0.2)});
page1.drawCircle({ "opacity":1, x:150, y:740,size:100,color:rgb(0.2,0.8,0.2)});
writeFileSync("output.pdf",await pdfData.save());

do this.

import {rgb} from "pdf-lib";
import {PDFDocument} from "pdf-lib_patch";
const pdfData = await PDFDocument.load(readFileSync("input.pdf"),{"password":"ownerpassword"});
const page1 = pdfData.getPage(0);
page1.drawCircle({ "opacity":1, x:100, y:740,size:100,color:rgb(0.8,0.2,0.2)});
page1.drawCircle({ "opacity":1, x:150, y:740,size:100,color:rgb(0.2,0.8,0.2)});
pdfData.encrypt({
  "keyBits":256,
  "userPassword":"",
  "ownerPassword":"newownerpassword",
  "permission":{"printing":"highResolution"}
});
writeFileSync("output.pdf",await pdfData.save({"useObjectStreams":false}));
//{"useObjectStreams":false} is requested,because pdf broken.