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- let fs = require("fs");
- let http = require("http");
- let pathlib = require("path");
- let spawn = require("child_process").spawn;
- let tmp = require("tmp");
-
- function processPandoc(req, res) {
- let tmpf = tmp.fileSync({ postfix: ".pdf" });
-
- let child = spawn("pandoc",
- [ "--standalone", "--output", tmpf.name ]);
-
- child.on("error", err => {
- res.writeHead(500);
- res.end(JSON.stringify({ output: err.toString() }));
- tmpf.removeCallback();
- });
-
- let output = "";
- child.stdout.on("data", d => output += d.toString());
- child.stderr.on("data", d => output += d.toString());
-
- child.on("exit", (code, sig) => {
- if (code === 0) {
- res.end(JSON.stringify({
- pdf: fs.readFileSync(tmpf.name).toString("base64"),
- output
- }));
- tmpf.removeCallback();
- } else {
- res.end(JSON.stringify({ output }));
- tmpf.removeCallback();
- }
- });
-
- req.pipe(child.stdin);
- }
-
- function mime(path) {
- if (path.endsWith(".html"))
- return "text/html";
- if (path.endsWith(".css"))
- return "text/css";
- if (path.endsWith(".js"))
- return "application/javascript";
-
- return "application/octet-stream";
- }
-
- function serve(url, res) {
- let path = pathlib.join(__dirname, "web", url);
- let rs = fs.createReadStream(path);
- rs.once("error", err => {
- if (err.code == "ENOENT") {
- res.writeHead(404);
- res.end("404 Not Found");
- } else {
- res.writeHead(500);
- res.end("500 Internal Server Error");
- console.error(err);
- }
- });
- rs.once("open", () => {
- res.writeHead(200, {
- "Content-Type": mime(path)
- });
- rs.pipe(res);
- });
- }
-
- let server = http.createServer((req, res) => {
- if (req.url == "/") {
- serve("/index.html", res);
- } else if (req.method == "POST" && req.url == "/pandoc") {
- processPandoc(req, res);
- } else {
- serve(req.url, res);
- }
- });
-
- let port = process.env.PORT || 8080;
- server.listen(port, "127.0.0.1");
- console.log("Listening to 127.0.0.1:" + port);
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