File size: 4,258 Bytes
1b756c8 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | 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 {
performCondenseCompression,
performPhotonCompression,
} from '../../utils/compress.js';
import type { CondenseCustomSettings } from '../../utils/compress.js';
import { isPyMuPDFAvailable } from '../../utils/pymupdf-loader.js';
export class CompressNode extends BaseWorkflowNode {
readonly category = 'Optimize & Repair' as const;
readonly icon = 'ph-lightning';
readonly description = 'Reduce PDF file size';
constructor() {
super('Compress');
this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
this.addOutput(
'pdf',
new ClassicPreset.Output(pdfSocket, 'Compressed PDF')
);
this.addControl(
'algorithm',
new ClassicPreset.InputControl('text', { initial: 'condense' })
);
this.addControl(
'compressionLevel',
new ClassicPreset.InputControl('text', { initial: 'balanced' })
);
this.addControl(
'imageQuality',
new ClassicPreset.InputControl('number', { initial: 75 })
);
this.addControl(
'dpiTarget',
new ClassicPreset.InputControl('number', { initial: 96 })
);
this.addControl(
'dpiThreshold',
new ClassicPreset.InputControl('number', { initial: 150 })
);
this.addControl(
'removeMetadata',
new ClassicPreset.InputControl('text', { initial: 'true' })
);
this.addControl(
'subsetFonts',
new ClassicPreset.InputControl('text', { initial: 'true' })
);
this.addControl(
'convertToGrayscale',
new ClassicPreset.InputControl('text', { initial: 'false' })
);
this.addControl(
'removeThumbnails',
new ClassicPreset.InputControl('text', { initial: 'true' })
);
}
private getTextControl(key: string, fallback: string): string {
const ctrl = this.controls[key] as
| ClassicPreset.InputControl<'text'>
| undefined;
return ctrl?.value ?? fallback;
}
private getNumberControl(key: string, fallback: number): number {
const ctrl = this.controls[key] as
| ClassicPreset.InputControl<'number'>
| undefined;
return ctrl?.value ?? fallback;
}
async data(
inputs: Record<string, SocketData[]>
): Promise<Record<string, SocketData>> {
const pdfInputs = requirePdfInput(inputs, 'Compress');
const algorithm = this.getTextControl('algorithm', 'condense');
const level = this.getTextControl('compressionLevel', 'balanced');
const customSettings: CondenseCustomSettings = {
imageQuality: this.getNumberControl('imageQuality', 75),
dpiTarget: this.getNumberControl('dpiTarget', 96),
dpiThreshold: this.getNumberControl('dpiThreshold', 150),
removeMetadata: this.getTextControl('removeMetadata', 'true') === 'true',
subsetFonts: this.getTextControl('subsetFonts', 'true') === 'true',
convertToGrayscale:
this.getTextControl('convertToGrayscale', 'false') === 'true',
removeThumbnails:
this.getTextControl('removeThumbnails', 'true') === 'true',
};
return {
pdf: await processBatch(pdfInputs, async (input) => {
const arrayBuffer = input.bytes.buffer.slice(
input.bytes.byteOffset,
input.bytes.byteOffset + input.bytes.byteLength
) as ArrayBuffer;
let pdfBytes: Uint8Array;
if (algorithm === 'condense' && isPyMuPDFAvailable()) {
const blob = new Blob([arrayBuffer], { type: 'application/pdf' });
const result = await performCondenseCompression(
blob,
level,
customSettings
);
pdfBytes = new Uint8Array(await result.blob.arrayBuffer());
} else {
pdfBytes = await performPhotonCompression(arrayBuffer, level);
}
const document = await PDFDocument.load(pdfBytes);
return {
type: 'pdf',
document,
bytes: pdfBytes,
filename: input.filename.replace(/\.pdf$/i, '_compressed.pdf'),
};
}),
};
}
}
|