98 lines
2.8 KiB
TypeScript
98 lines
2.8 KiB
TypeScript
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import nextConnect from "next-connect";
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import { NextApiResponse } from "next";
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import writeYamlFile from "write-yaml-file";
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import { statSync, createReadStream, writeFileSync, readFileSync } from "fs";
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import { spawn } from "child_process";
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import { join } from "path";
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import { deleteFile } from "../../lib/backend-file-utils";
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import multer from "multer";
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const upload = multer({
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storage: multer.diskStorage({
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destination: './tmp',
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filename: (req, file, cb) => {
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cb(null, file.originalname);
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},
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}),
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});
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const route = nextConnect<any, NextApiResponse>({
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onError(error, req, res) {
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res.status(501).json({ error: `Sorry something Happened! ${error.message}` });
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},
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onNoMatch(req, res) {
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res.status(405).json({ error: `Method '${req.method}' Not Allowed` });
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},
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});
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route.use(upload.any());
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route.post((req, res) => {
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const coverFile = (req.files[0] as Express.Multer.File);
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const cover = coverFile ? join("tmp", coverFile.filename) : undefined;
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const content = req.body.content as string;
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const frontmatter = JSON.parse(req.body.frontmatter) as Frontmatter;
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makeEpub(content, frontmatter, cover, (err, toDownload) => {
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if (err || !toDownload) throw err;
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const stat = statSync(toDownload);
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// express res.download doesn't work with next-connect
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res.writeHead(200, {
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'Content-Type': 'application/epub+zip',
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'Content-Length': stat.size,
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'Content-Disposition': "attacment",
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});
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const readStream = createReadStream(toDownload);
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readStream.pipe(res);
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readStream.on("close", () => {
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deleteFile(toDownload);
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});
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});
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});
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export default route;
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export const config = {
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api: {
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bodyParser: false,
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},
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};
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async function makeEpub(content: string, frontmatter: Frontmatter, cover: string | undefined, callback: (err: any, toDownload?: string) => void) {
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const ts = new Date().getTime().toString();
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const mdFile = join("tmp", `${ts}.md`);
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const yamlFile = join("tmp", `${ts}.yaml`);
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const epubFile = join("tmp", `${ts}.epub`);
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if (cover) {
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frontmatter["epub-cover-image"] = cover;
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frontmatter["cover-image"] = cover;
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}
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writeFileSync(mdFile, content, "utf-8");
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await writeYamlFile(yamlFile, frontmatter);
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writeFileSync(yamlFile, `
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---
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${readFileSync(yamlFile, "utf-8")}
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---
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`, "utf8");
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const pandoc = spawn("pandoc", [
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"--table-of-contents",
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"--css",
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join("templates", "book.css"),
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"-o",
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epubFile,
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yamlFile,
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mdFile,
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]);
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pandoc.on("error", (err) => {
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console.error("error converting word document");
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console.error(err);
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});
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pandoc.stderr.on("data", data => {
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console.error(data.toString());
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});
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pandoc.on("close", (code) => {
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if (code === 0) {
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callback(null, epubFile);
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} else {
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callback("error making epub with pandoc");
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}
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deleteFile(mdFile, yamlFile, cover);
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});
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}
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