Started migrating workflow controller

shared-operations/src/functions/splitPDF.ts

@@ -0,0 +1,29 @@
+
+import { PDFDocument } from 'pdf-lib';
+
+import { selectPages } from "./subDocumentFunctions";
+import { PdfFile } from '../wrappers/PdfFile';
+
+export async function splitPDF(file: PdfFile, splitAfterPageArray: number[]): Promise<PdfFile[]> {
+    const byteFile = await file.convertToPdfLibFile();
+    if (!byteFile?.pdfLib) return [];
+
+    const numberOfPages = byteFile.pdfLib.getPages().length;
+
+    let pagesArray: number[]  = [];
+    let splitAfter = splitAfterPageArray.shift();
+    const subDocuments: PdfFile[]  = [];
+
+    for (let i = 0; i < numberOfPages; i++) {
+        if(splitAfter && i > splitAfter && pagesArray.length > 0) {
+            subDocuments.push(await selectPages(byteFile, pagesArray));
+            splitAfter = splitAfterPageArray.shift();
+            pagesArray = [];
+        }
+        pagesArray.push(i);
+    }
+    subDocuments.push(await selectPages(byteFile, pagesArray));
+    pagesArray = [];
+
+    return subDocuments;
+};