Add visual workflow builder, fix critical bugs, and add Arabic i18n support

src/js/workflow/nodes/pdf-to-pdfa-node.ts

@@ -0,0 +1,82 @@
+import { ClassicPreset } from 'rete';
+import { BaseWorkflowNode } from './base-node';
+import { pdfSocket } from '../sockets';
+import type { SocketData } from '../types';
+import { requirePdfInput, processBatch } from '../types';
+import { PDFDocument } from 'pdf-lib';
+import { loadGhostscript } from '../../utils/ghostscript-dynamic-loader.js';
+import { loadPyMuPDF } from '../../utils/pymupdf-loader.js';
+
+export class PdfToPdfANode extends BaseWorkflowNode {
+  readonly category = 'Optimize & Repair' as const;
+  readonly icon = 'ph-archive';
+  readonly description = 'Convert PDF to PDF/A for archiving';
+
+  constructor() {
+    super('PDF to PDF/A');
+    this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
+    this.addOutput('pdf', new ClassicPreset.Output(pdfSocket, 'PDF/A'));
+    this.addControl(
+      'level',
+      new ClassicPreset.InputControl('text', { initial: 'PDF/A-2b' })
+    );
+    this.addControl(
+      'preFlatten',
+      new ClassicPreset.InputControl('text', { initial: 'false' })
+    );
+  }
+
+  async data(
+    inputs: Record<string, SocketData[]>
+  ): Promise<Record<string, SocketData>> {
+    const pdfInputs = requirePdfInput(inputs, 'PDF to PDF/A');
+
+    const getText = (key: string, fallback: string) => {
+      const ctrl = this.controls[key] as
+        | ClassicPreset.InputControl<'text'>
+        | undefined;
+      return ctrl?.value || fallback;
+    };
+
+    const level = getText('level', 'PDF/A-2b');
+    const preFlatten = getText('preFlatten', 'false') === 'true';
+
+    return {
+      pdf: await processBatch(pdfInputs, async (input) => {
+        let pdfBytes = input.bytes;
+
+        if (preFlatten) {
+          const pymupdf = await loadPyMuPDF();
+          const blob = new Blob([new Uint8Array(pdfBytes)], {
+            type: 'application/pdf',
+          });
+          const flattenedBlob = await pymupdf.rasterizePdf(blob, {
+            dpi: 300,
+            format: 'png',
+          });
+          pdfBytes = new Uint8Array(await flattenedBlob.arrayBuffer());
+        }
+
+        const gs = await loadGhostscript();
+        const pdfBuffer = pdfBytes.buffer.slice(
+          pdfBytes.byteOffset,
+          pdfBytes.byteOffset + pdfBytes.byteLength
+        );
+        const resultBuffer = await gs.convertToPDFA(
+          pdfBuffer as ArrayBuffer,
+          level
+        );
+
+        const bytes = new Uint8Array(resultBuffer);
+        const document = await PDFDocument.load(bytes);
+
+        return {
+          type: 'pdf',
+          document,
+          bytes,
+          filename: input.filename.replace(/\.pdf$/i, '_pdfa.pdf'),
+        };
+      }),
+    };
+  }
+}