Started migrating workflow controller

shared-operations/src/wrappers/PdfFile.ts

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+
+import { PDFDocument } from 'pdf-lib';
+import * as PDFJS from 'pdfjs-dist';
+import { PDFDocumentProxy } from 'pdfjs-dist/types/src/display/api';
+
+export class PdfFile {
+    byteArray: Uint8Array | null;
+    pdfLib: PDFDocument | null;
+    pdfJs: PDFDocumentProxy | null;
+    filename: string;
+
+    constructor() {    
+        this.byteArray = null;
+        this.pdfLib = null;
+        this.pdfJs = null;
+        this.filename = "";
+    }   
+
+    async convertToByteArrayFile(): Promise<PdfFile> {
+        if (this.byteArray) return this;
+
+        var byteArray: Uint8Array|null = null;
+        if (this.pdfLib) {
+            byteArray = await this.pdfLib.save();
+        } else if (this.pdfJs) {
+            byteArray = await this.pdfJs.getData();
+        }
+        return fromUint8Array(byteArray!, this.filename);
+    }
+    async convertToPdfLibFile(): Promise<PdfFile> {
+        if (this.pdfLib) return this;
+
+        const byteFile = await this.convertToByteArrayFile();
+        const pdfLib = await PDFDocument.load(byteFile.byteArray!, {
+            updateMetadata: false,
+        });
+        return fromPdfLib(pdfLib, this.filename);
+    }
+    async convertToPdfJsFile(): Promise<PdfFile> {
+        if (this.pdfJs) return this;
+
+        const byteFile = await this.convertToByteArrayFile();
+        const pdfJs = await PDFJS.getDocument(byteFile.byteArray!).promise;
+        return fromPdfJs(pdfJs, this.filename);
+    }
+
+    async getAsByteArray(): Promise<Uint8Array> {
+        const file = await this.convertToByteArrayFile();
+        return file.byteArray!;
+    }
+    async getAsPdfLib(): Promise<PDFDocument> {
+        const file = await this.convertToPdfLibFile();
+        return file.pdfLib!;
+    }
+    async getAsPdfJs(): Promise<PDFDocumentProxy> {
+        const file = await this.convertToPdfJsFile();
+        return file.pdfJs!;
+    }
+}
+
+export function fromMulterFile(value: Express.Multer.File): PdfFile {
+    return fromUint8Array(value.buffer, value.originalname)
+}
+export function fromUint8Array(value: Uint8Array, filename: string): PdfFile {
+    const out = new PdfFile();
+    out.byteArray = value;
+    out.filename = filename;
+    return out;
+}
+export function fromPdfLib(value: PDFDocument, filename: string): PdfFile {
+    const out = new PdfFile();
+    out.pdfLib = value;
+    out.filename = filename;
+    return out;
+}
+export function fromPdfJs(value: PDFDocumentProxy, filename: string): PdfFile {
+    const out = new PdfFile();
+    out.pdfJs = value;
+    out.filename = filename;
+    return out;
+}
+
+export async function convertAllToByteArrayFile(files: PdfFile[]): Promise<(PdfFile)[]> {
+    const pdfPromises = files.map(s => s.convertToByteArrayFile());
+    return await Promise.all(pdfPromises);
+}
+
+export async function convertAllToPdfLibFile(files: PdfFile[]): Promise<(PdfFile)[]> {
+    const pdfPromises = files.map(s => s.convertToPdfLibFile());
+    return await Promise.all(pdfPromises);
+}
+
+export async function convertAllToPdfJsFile(files: PdfFile[]): Promise<(PdfFile)[]> {
+    const pdfPromises = files.map(s => s.convertToPdfJsFile());
+    return await Promise.all(pdfPromises);
+}