3 files changed, 170 insertions, 0 deletions
diff --git a/README.markdown b/README.markdown
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+# go - minimalistic uri shortener
+
+## install dependencies
+
+    npm install
+
+  apparently you can also
+
+    npm install hiredis
+
+  for more awesome.
+
+## run service
+
+    PORT=80 node .
+
+  if you omit `PORT`, then it's `1337`.
+
+  there's also the possibility to change the Redis key prefix which
+  defaults to `go:` with
+
+    REDIS_KEY_PREFIX=foobarmyprefix/
+
+## add uri
+
+    curl -F uri=https://mywaytoolonguri http://localhost:1337
+
+  this will give you a shortened uri.
+
+## resolve uri
+
+    curl -L http://localhost:1337/1
+
+## clear database
+
+    redis-cli keys 'go:*' | xargs redis-cli del
+
+  if you have changed `redisPrefix`, then use that instead of `go:`.
+
+## use systemd
+
+  run
+
+    make install
+
+  to install the systemd service and configuration files.
+  this will fail if the files are already installed and modified.
+
+  configure `HOSTN` and `PORT` in `/etc/conf.d/go.env` and the user
+  and/or group in `/etc/systemd/system/go.service`.
+
+  and finally start the service with
+
+    systemctl start go
diff --git a/index.js b/index.js
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+// configuration
+var httpPort = process.env.PORT;
+var redisPrefix = process.env.REDIS_KEY_PREFIX;
+
+
+// automatic configuration
+if (!httpPort) {
+  httpPort = 1337;
+}
+if (!redisPrefix) {
+  redisPrefix = 'go:';
+}
+
+
+// load libraries
+var http = require('http');
+var url = require('url');
+var formidable = require('formidable');
+var redis = require('redis');
+
+
+// instantiate components
+var redisClient = redis.createClient();
+var httpServer = http.createServer(listener);
+
+
+// setup compoments
+redisClient.on('error', function (err) {
+  console.log('redis made a bubu:', err.message);
+  process.exit(23);
+});
+httpServer.listen(httpPort, function () {
+  console.log('http server listening on port', httpPort);
+});
+
+
+// http handler
+function listener (req, res) {
+  if (req.method === 'POST' && req.url === '/') {
+    return create(req, res);
+  } else if (req.method === 'GET') {
+    return retrieve(req, res);
+  } else {
+    return methodNotAllowed(req, res);
+  }
+}
+
+function create (req, res) {
+  redisClient.incr(redisPrefix + 'index', function (err, reply) {
+    if (err) {
+      return internalError(err, req, res);
+    }
+
+    var form = new formidable.IncomingForm();
+
+    form.parse(req, function(err, fields, files) {
+      if (err) {
+        return internalError(err, req, res);
+      }
+
+      var uri = fields.uri;
+      // TODO check uri(?)
+      var shortPath = '/' + reply;
+      var shortUri = 'http://' + req.headers.host + shortPath;
+      var key = redisPrefix + shortPath;
+
+      redisClient.set(key, uri, function (error) {
+        if (error) {
+          return internalError(err, req, res);
+        }
+
+        res.writeHead(200, { 'content-type': 'text/plain' });
+        return res.end(shortUri + '\r\n');
+      });
+    });
+  });
+}
+
+function retrieve (req, res) {
+  var key = redisPrefix + url.parse(req.url).path;
+  redisClient.get(key, function (error, reply) {
+    if (error) {
+      return internalError(err, req, res);
+    }
+    
+    if (typeof reply !== 'string') {
+      res.writeHead(404, { 'content-type': 'text/plain' });
+      return res.end('not found\r\n');
+    }
+
+    res.writeHead(302, {
+      'content-type': 'text/plain',
+      'location': reply,
+    });
+    return res.end();
+  });
+}
+
+function methodNotAllowed (req, res) {
+  res.writeHead(405, { 'content-type': 'text/plain' });
+  return res.end('method not allowed\r\n');
+}
+function internalError (error, req, res) {
+  res.writeHead(500, { 'content-type': 'text/plain' });
+  return res.end(error.message + '\r\n');
+}
diff --git a/package.json b/package.json
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+{
+  "name": "go",
+  "version": "0.0.0",
+  "description": "minimalistic uri shortener",
+  "dependencies": {
+    "formidable": "*",
+    "redis": "*"
+  },
+  "license": "WTFPL"
+}