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merge

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This commit is contained in:
Felix Kaspar 2024-05-12 21:40:28 +02:00
parent c723a5c77d
commit f587797ddb
3 changed files with 61 additions and 20 deletions
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4
shared-operations/public/locales/merge/en.json Normal file
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{
"friendlyName": "Merge",
"description": "Merge multiple input documents into a single output document."
}

57
shared-operations/src/functions/merge.ts Normal file
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import { PdfFile, RepresentationType } from "../wrappers/PdfFile";
import { Operator, Progress, nToOne } from ".";
import Joi from "@stirling-tools/joi";
import { JoiPDFFileSchema } from "../wrappers/PdfFileJoi";
import i18next from "i18next";
import { PDFDocument } from "pdf-lib";
export class Merge extends Operator {
static type = "merge";
/**
* Validation & Localisation
*/
protected static inputSchema = JoiPDFFileSchema.label(i18next.t("inputs.pdffile.name")).description(i18next.t("inputs.pdffile.description"));
protected static valueSchema = Joi.object({});
protected static outputSchema = JoiPDFFileSchema.label(i18next.t("outputs.pdffile.name")).description(i18next.t("outputs.pdffile.description"));
static schema = Joi.object({
input: Merge.inputSchema,
values: Merge.valueSchema.required(),
output: Merge.outputSchema
}).label(i18next.t("friendlyName", { ns: "merge" })).description(i18next.t("description", { ns: "merge" }));
/**
* Logic
*/
/** Merging pages from multiple pdfs into a singe output document. */
async run(input: PdfFile[], progressCallback: (state: Progress) => void): Promise<PdfFile[]> {
return nToOne<PdfFile, PdfFile>(input, async (input) => {
const mergedPdf = await PDFDocument.create();
for (let i = 0; i < input.length; i++) {
progressCallback({ curFileProgress: 0, operationProgress: i/input.length });
const pdfToMerge = await input[i].pdfLibDocument;
const copiedPages = await mergedPdf.copyPages(pdfToMerge, pdfToMerge.getPageIndices());
copiedPages.forEach((page, index, array) => {
progressCallback({ curFileProgress: index/array.length, operationProgress: i/input.length });
mergedPdf.addPage(page);
});
progressCallback({ curFileProgress: 1, operationProgress: i/input.length });
}
progressCallback({ curFileProgress: 1, operationProgress: 1 });
const newName = "merged_" + input.map(input => input.filename).join("_and_");
return new PdfFile("mergedPDF", mergedPdf, RepresentationType.PDFLibDocument, newName);
});
}
}

20
shared-operations/src/functions/mergePDFs.ts
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import { PDFDocument } from "pdf-lib";
import { PdfFile, RepresentationType } from "../wrappers/PdfFile";
export interface MergeParamsType {
files: PdfFile[];
}
export async function mergePDFs(params: MergeParamsType): Promise<PdfFile> {
const mergedPdf = await PDFDocument.create();
for (let i = 0; i < params.files.length; i++) {
const pdfToMerge = await params.files[i].pdfLibDocument;
const copiedPages = await mergedPdf.copyPages(pdfToMerge, pdfToMerge.getPageIndices());
copiedPages.forEach((page) => mergedPdf.addPage(page));
}
const newName = "("+params.files.map(input => input.filename).join("_and_") + ")_merged";
return new PdfFile("mergedPDF", mergedPdf, RepresentationType.PDFLibDocument, newName);
}