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node based backend

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This commit is contained in:
Felix Kaspar
2023-10-17 01:31:00 +02:00
parent 542d74b9cc
commit 76e37354e1
4 changed files with 313 additions and 10 deletions
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194
public/index.js
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@@ -1,16 +1,192 @@
import { scaleContent } from "./functions/scaleContent.js";
import { scalePage, PageSize } from "./functions/scalePage.js";
import { organizeWaitOperations } from "./organizeWaitOperations.js";
import { testWorkflow } from "./testWorkflow.js";
(async () => {
(async (workflow) => {
const pdfFileInput = document.getElementById('pdfFile');
const doneButton = document.getElementById("doneButton");
pdfFileInput.addEventListener('change', async (e) => {
const file = e.target.files[0];
if (file) {
let pdfBuffer = new Uint8Array(await file.arrayBuffer());
pdfBuffer = await scaleContent(pdfBuffer, 2);
pdfBuffer = await scalePage(pdfBuffer, PageSize.letter);
download(pdfBuffer, "pdf-lib_creation_example.pdf", "application/pdf");
doneButton.addEventListener('click', async (e) => {
const files = Array.from(pdfFileInput.files);
console.log(files);
const pdfBuffers = await Promise.all(files.map(async file => {
return {
originalFileName: file.name.replace(/\.[^/.]+$/, ""),
fileName: file.name.replace(/\.[^/.]+$/, ""),
buffer: new Uint8Array(await file.arrayBuffer())
}
}));
console.log(pdfBuffers);
const waitOperations = organizeWaitOperations(workflow.operations);
nextOperation(workflow.operations, pdfBuffers);
async function nextOperation(operations, input) {
if(Array.isArray(operations) && operations.length == 0) { // isEmpty
console.log("operation done: " + input.fileName);
//TODO: Download Restult
return;
}
for (let i = 0; i < operations.length; i++) {
console.warn(input);
await computeOperation(operations[i], structuredClone(input)); // break references
}
}
async function computeOperation(operation, input) {
switch (operation.type) {
case "done":
console.log("Done operation will get called if all waits are done. Skipping for now.")
break;
case "wait":
const waitOperation = waitOperations[operation.values.id];
waitOperation.input.push(input);
waitOperation.waitCount--;
if(waitOperation.waitCount == 0) {
await nextOperation(waitOperation.doneOperation.operations, waitOperation.input);
}
break;
case "removeObjects":
if(Array.isArray(input)) {
for (let i = 0; i < input.length; i++) {
// TODO: modfiy input
input[i].fileName += "_removedObjects";
await nextOperation(operation.operations, input[i]);
}
}
else {
// TODO: modfiy input
input.fileName += "_removedObjects";
await nextOperation(operation.operations, input);
}
break;
case "extract":
if(Array.isArray(input)) {
for (let i = 0; i < input.length; i++) {
// TODO: modfiy input
input[i].fileName += "_extractedPages";
await nextOperation(operation.operations, input[i]);
}
}
else {
// TODO: modfiy input
input.fileName += "_extractedPages";
await nextOperation(operation.operations, input);
}
break;
case "fillField":
if(Array.isArray(input)) {
for (let i = 0; i < input.length; i++) {
// TODO: modfiy input
input[i].fileName += "_filledField";
await nextOperation(operation.operations, input[i]);
}
}
else {
// TODO: modfiy input
input.fileName += "_filledField";
await nextOperation(operation.operations, input);
}
break;
case "extractImages":
if(Array.isArray(input)) {
for (let i = 0; i < input.length; i++) {
// TODO: modfiy input
input[i].fileName += "_extractedImages";
await nextOperation(operation.operations, input[i]);
}
}
else {
// TODO: modfiy input
input.fileName += "_extractedImages";
await nextOperation(operation.operations, input);
}
break;
case "merge":
if(Array.isArray(input)) {
input = {
originalFileName: input.map(input => input.originalFileName).join("_and_"),
fileName: input.map(input => input.fileName).join("_and_") + "_merged",
buffer: input[0].buffer // TODO: merge inputs
}
}
else {
// TODO: modfiy input
input.fileName += "_merged";
}
await nextOperation(operation.operations, input);
break;
case "transform": {
if(Array.isArray(input)) {
for (let i = 0; i < input.length; i++) {
// TODO: modfiy input
input[i].fileName += "_transformed";
await nextOperation(operation.operations, input[i]);
}
}
else {
// TODO: modfiy input
input.fileName += "_transformed";
await nextOperation(operation.operations, input);
}
break;
}
default:
console.log("operation type unknown: ", operation.type);
break;
}
}
// if(selectedElementsList[0].textContent == "mergePDFs") {
// }
// // TODO: This can also be run serverside
// if(files.length > 1) {
// files.forEach(file => {
// });
// }
// else {
// const file = files[0];
// let pdfBuffer = new Uint8Array(await file.arrayBuffer());
// if (file) {
// for (let i = 0; i < selectedElementsList.length; i++) {
// const selectedOption = selectedElementsList[i];
// // Perform actions based on the selected option using the switch statement
// switch (selectedOption.textContent) {
// case "scaleContent":
// pdfBuffer = await scaleContent(pdfBuffer, 2);
// break;
// case "changePageSize":
// pdfBuffer = await scalePage(pdfBuffer, PageSize.letter);
// break;
// default:
// // Handle any other actions or errors here
// throw new Error(`This action ${selectedOption.value} has not been implemented.`);
// }
// }
// download(pdfBuffer, file.name.replace(/\.[^/.]+$/, "") + "_mod.pdf", "application/pdf");
// }
// }
});
})();
// document.getElementById("addButton").addEventListener("click", function() {
// const selectedOption = document.getElementById("pdfOptions").value;
// const operations = document.getElementById("operations");
// if (selectedOption) {
// const listItem = document.createElement("li");
// listItem.textContent = selectedOption;
// operations.appendChild(listItem);
// }
// });
})(testWorkflow);