46 lines
1.6 KiB
TypeScript
46 lines
1.6 KiB
TypeScript
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import { ClassicPreset } from 'rete';
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import { BaseWorkflowNode } from './base-node';
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import { pdfSocket } from '../sockets';
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import type { SocketData } from '../types';
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import { requirePdfInput, processBatch } from '../types';
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import { PDFDocument } from 'pdf-lib';
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export class ReversePagesNode extends BaseWorkflowNode {
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readonly category = 'Organize & Manage' as const;
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readonly icon = 'ph-sort-descending';
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readonly description = 'Reverse page order';
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constructor() {
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super('Reverse Pages');
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this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
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this.addOutput('pdf', new ClassicPreset.Output(pdfSocket, 'Reversed PDF'));
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}
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async data(
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inputs: Record<string, SocketData[]>
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): Promise<Record<string, SocketData>> {
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const pdfInputs = requirePdfInput(inputs, 'Reverse Pages');
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return {
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pdf: await processBatch(pdfInputs, async (input) => {
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const srcDoc = await PDFDocument.load(input.bytes);
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const pageCount = srcDoc.getPageCount();
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const newDoc = await PDFDocument.create();
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const reversedIndices = Array.from(
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{ length: pageCount },
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(_, i) => pageCount - 1 - i
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);
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const copiedPages = await newDoc.copyPages(srcDoc, reversedIndices);
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copiedPages.forEach((page) => newDoc.addPage(page));
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const pdfBytes = await newDoc.save();
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return {
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type: 'pdf',
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document: newDoc,
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bytes: new Uint8Array(pdfBytes),
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filename: input.filename.replace(/\.pdf$/i, '_reversed.pdf'),
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};
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}),
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};
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}
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}
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