Improved to reuse the font if it is already embedded in the PDF.

README.md

@@ -51,9 +51,10 @@ Just import the dependencies and this tool.
 <script src="https://unpkg.com/node-forge@1.3.1/dist/forge.min.js" type="text/javascript"></script>
 <script src="https://cdn.jsdelivr.net/npm/zgapdfsigner/dist/zgapdfsigner.min.js" type="text/javascript"></script>
 ```
-When drawing text by non-standard font, importing the fontkit library is necessary.
+When drawing text for signature, importing fontkit and pako library is necessary.
 ```html
 <script src="https://unpkg.com/@pdf-lib/fontkit/dist/fontkit.umd.min.js" type="text/javascript"></script>
+<script src="https://unpkg.com/pako@1.0.11/dist/pako_inflate.min.js" type="text/javascript"></script>
 ```
 
 ### [Google Apps Script](https://developers.google.com/apps-script)
@@ -68,8 +69,10 @@ function setTimeout(func, sleep){
 var window = globalThis;
 // Load pdf-lib
 eval(UrlFetchApp.fetch("https://unpkg.com/pdf-lib@1.17.1/dist/pdf-lib.min.js").getContentText());
-// It is necessary for drawing text by non-standard font.
+// It is necessary for drawing text for signature.
 eval(UrlFetchApp.fetch("https://unpkg.com/@pdf-lib/fontkit/dist/fontkit.umd.min.js").getContentText());
+// Load pako, It is necessary for drawing text for signature.
+eval(UrlFetchApp.fetch("https://unpkg.com/pako@1.0.11/dist/pako_inflate.min.js").getContentText());
 // Load node-forge
 eval(UrlFetchApp.fetch("https://unpkg.com/node-forge@1.3.1/dist/forge.min.js").getContentText());
 // Load ZgaPdfSigner

closure/pdflib-ext.js

@@ -9,7 +9,17 @@
 var PdfLoadOptions;
 
 /** @const */
-var fontkit = {};
+var pako = {};
+/**
+ * @param {Uint8Array} input
+ * @return {Uint8Array}
+ */
+pako.inflate = function(input){};
+
+/** @constructor */
+var Fontkit = function(){};
+/** @const {Fontkit} */
+var fontkit;
 
 /** @const */
 var PDFLib = {};
@@ -41,6 +51,11 @@ PDFLib.lineSplit = function(text){};
  * @return {boolean}
  */
 PDFLib.isNewlineChar = function(text){};
+/**
+ * @param {string} fntnm
+ * @return {boolean}
+ */
+PDFLib.isStandardFont = function(fntnm){};
 
 /** @constructor */
 PDFLib.PDFDocument = function(){};
@@ -105,7 +120,7 @@ PDFLib.PDFDocument.prototype.embedFont = function(font, options){};
  */
 PDFLib.PDFDocument.prototype.embedStandardFont = function(font, customName){};
 /**
- * @lends {fontkit} fkt
+ * @param {Fontkit} fkt
  */
 PDFLib.PDFDocument.prototype.registerFontkit = function(fkt){};
 /**
@@ -316,6 +331,8 @@ PDFLib.PDFName.Annots;
  * @return {PDFLib.PDFName}
  */
 PDFLib.PDFName.of = function(value){};
+/** @return {string} */
+PDFLib.PDFName.prototype.asString = function(){};
 /** @type {string} */
 PDFLib.PDFName.prototype.encodedName;
 /** @type {number} */
@@ -338,10 +355,20 @@ PDFLib.PDFArray.prototype.push = function(object){};
  * @return {PDFLib.PDFObject}
  */
 PDFLib.PDFArray.prototype.get = function(idx){};
+/**
+ * @return {number}
+ */
+PDFLib.PDFArray.prototype.size = function(){};
 /**
  * @return {Array<PDFLib.PDFObject>}
  */
 PDFLib.PDFArray.prototype.asArray = function(){};
+/**
+ * @param {number} idx
+ * @param {*} typ
+ * @return {PDFLib.PDFObject}
+ */
+PDFLib.PDFArray.prototype.lookupMaybe = function(idx, typ){};
 
 /**
  * @constructor
@@ -403,8 +430,34 @@ PDFLib.PDFImage.prototype.size = function(){};
 /** @type {PDFLib.PDFRef} */
 PDFLib.PDFImage.prototype.ref;
 
+/** @constructor */
+PDFLib.StandardFontEmbedder = function(){};
+/**
+ * @param {string} fontName
+ * @param {string=} customName
+ * @return {PDFLib.StandardFontEmbedder}
+ */
+PDFLib.StandardFontEmbedder.for = function(fontName, customName){};
+
+/** @constructor */
+PDFLib.CustomFontEmbedder = function(){};
+/**
+ * @param {Fontkit} fontkit
+ * @param {Uint8Array} fontData
+ * @param {string=} customName
+ * @return {PDFLib.CustomFontEmbedder}
+ */
+PDFLib.CustomFontEmbedder.for = function(fontkit, fontData, customName){};
+
 /** @constructor */
 PDFLib.PDFFont = function(){};
+/**
+ * @param {PDFLib.PDFRef} ref
+ * @param {PDFLib.PDFDocument} doc
+ * @param {PDFLib.StandardFontEmbedder|PDFLib.CustomFontEmbedder} embedder
+ * @return {PDFLib.PDFFont}
+ */
+PDFLib.PDFFont.of = function(ref, doc, embedder){};
 /** @type {PDFLib.PDFRef} */
 PDFLib.PDFFont.prototype.ref;
 /** @type {string} */
@@ -540,6 +593,12 @@ PDFLib.PDFContentStream.of = function(dict, operators, encode){};
  * @extends {PDFLib.PDFStream}
  */
 PDFLib.PDFRawStream = function(){};
+/** @type {PDFLib.PDFDict} */
+PDFLib.PDFRawStream.prototype.dict;
+/**
+ * @return {Uint8Array}
+ */
+PDFLib.PDFRawStream.prototype.getContents = function(){};
 
 /**
  * @constructor

lib/zgaindex.js

@@ -8,11 +8,11 @@ function genZga(){
 	const z = {};
 
 	/**
-	 * @param {string} msg
+	 * @param {...string} msg
 	 */
-	z.log = function(msg){
+	z.log = function(...msg){
 		if(z.debug){
-			console.log(msg);
+			console.log(...msg);
 		}
 	};
 

lib/zganode.d.ts

@@ -37,7 +37,7 @@ export type SignAreaInfo = {
 };
 export type SignTextInfo = {
   text: string,
-  fontData?: Array<number> | Uint8Array | ArrayBuffer | string;
+  fontData?: Array<number> | Uint8Array | ArrayBuffer | PDFLib.StandardFonts;
   color?: string;
   opacity?: number;
   blendMode?: string;
@@ -109,3 +109,8 @@ export declare class TsaFetcher {
   getToken(forP7?: boolean): forge.asn1.Asn1;
   queryTsa(data?: string): Promise<string>;
 }
+export declare class PdfFonts {
+  private constructor();
+  static from(pdfdoc: PDFLib.PDFDocument): Promise<PdfFonts>;
+  getEmbeddedFont(fontData?: Array<number> | Uint8Array | ArrayBuffer | PDFLib.StandardFonts): Promise<PDFLib.PDFFont>;
+}

lib/zganode.js

@@ -7,6 +7,7 @@ const z = require("./zgaindex.js");
 z.forge = require("node-forge");
 z.PDFLib = require("pdf-lib");
 z.fontkit = require("@pdf-lib/fontkit");
+z.pako = require("pako");
 /**
  * @param {string} url
  * @param {UrlFetchParams} params