├── .gitignore
├── Procfile
├── package.json
└── server.js


/.gitignore:
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1 | /node_modules


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/Procfile:
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1 | web: node server.js


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/package.json:
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 1 | {
 2 | 	"name": "wiki-proxy",
 3 | 	"version": "0.0.0",
 4 | 	"private": true,
 5 | 	"dependencies": {
 6 | 		"lru-cache": "~2.5.0"
 7 | 	},
 8 | 	"engines": {
 9 | 		"node": "0.10.x"
10 | 	}
11 | }


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/server.js:
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 1 | var http = require("http");
 2 | var https = require("https");
 3 | var LRU = require("lru-cache");
 4 | 
 5 | var port = process.env.PORT || 3000;
 6 | 
 7 | var cache = LRU({
 8 | 	max: 1024 * 1024 * 5, // 10MB
 9 | 	length: function(n) { return typeof n === "number" ? 4 : n.length },
10 | 	maxAge: 1000 * 60 * 5 // 5m
11 | });
12 | 
13 | http.createServer(function (req, res) {
14 | 	var path = req.url;
15 | 	if(path.indexOf("..") >= 0) return res.end("");
16 | 	var cacheEntry = cache.get(path);
17 | 	res.statusCode = 200;
18 | 	res.setHeader("Content-Type", "text/plain");
19 | 	res.setHeader("Access-Control-Allow-Origin", "*");
20 | 	res.setHeader("Access-Control-Allow-Methods", "GET");
21 | 	res.setHeader("Access-Control-Max-Age", "86400");
22 | 	res.setHeader("Cache-Control", "max-age=300, public");
23 | 	if(cacheEntry) {
24 | 		res.setHeader("X-Was-Cached", "Yes");
25 | 		if(typeof cacheEntry === "number") {
26 | 			res.statusCode = cacheEntry;
27 | 			res.end(cacheEntry + " Cached");
28 | 		} else {
29 | 			res.end(cacheEntry);
30 | 		}
31 | 		return;
32 | 	}
33 | 	console.log("Downloading request to " + path);
34 | 	https.get("https://raw.githubusercontent.com/wiki" + path + ".md", function(rawRes) {
35 | 		if(rawRes.statusCode === 200) {
36 | 			var result = [];
37 | 			rawRes.on("data", function(d) { result.push(d); });
38 | 			rawRes.on("end", function() {
39 | 				result = Buffer.concat(result);
40 | 				cache.set(path, result);
41 | 			});
42 | 			rawRes.pipe(res);
43 | 		} else {
44 | 			res.statusCode = rawRes.statusCode;
45 | 			cache.set(path, rawRes.statusCode);
46 | 			rawRes.pipe(res);
47 | 		}
48 | 	}).on("error", function(err) {
49 | 		try {
50 | 			res.statusCode = 500;
51 | 			cache.set(path, 500);
52 | 			res.end();
53 | 		} catch(e) {
54 | 			console.error(e);
55 | 		}
56 | 	});
57 | }).listen(port, function() {
58 | 	console.log('Server running at ' + port);
59 | });
60 | 


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