Don't store ip addresses.

appengine/cloudsql/app.js

@@ -17,6 +17,7 @@
 var format = require('util').format;
 var express = require('express');
 var mysql = require('mysql');
+var crypto = require('crypto');
 
 var app = express();
 app.enable('trust proxy');
@@ -33,11 +34,13 @@ var connection = mysql.createConnection({
 });
 
 app.get('/', function(req, res, next) {
+  var hash = crypto.createHash('sha256');
 
   // Add this visit to the database
   var visit = {
     timestamp: new Date(),
-    userIp: req.ip
+    // Store a hash of the ip address
+    userIp: hash.update(req.ip).digest('hex').substr(0, 7)
   };
 
   connection.query('INSERT INTO `visits` SET ?', visit, function(err) {
@@ -52,7 +55,7 @@ app.get('/', function(req, res, next) {
 
         var visits = results.map(function(visit) {
           return format(
-            'Time: %s, Addr: %s',
+            'Time: %s, AddrHash: %s',
             visit.timestamp,
             visit.userIp);
         });

appengine/datastore/app.js

@@ -18,6 +18,7 @@
 var format = require('util').format;
 var express = require('express');
 var gcloud = require('gcloud');
+var crypto = require('crypto');
 
 var app = express();
 app.enable('trust proxy');
@@ -29,12 +30,15 @@ var dataset = gcloud.datastore.dataset({
 });
 
 app.get('/', function(req, res, next) {
+  var hash = crypto.createHash('sha256');
+
   // Add this visit to the datastore
   dataset.save({
     key: dataset.key('visit'),
     data: {
       timestamp: new Date(),
-      userIp: req.ip
+      // Store a hash of the ip address
+      userIp: hash.update(req.ip).digest('hex').substr(0, 7)
     }
   }, function(err) {
     if (err) { return next(err); }
@@ -49,7 +53,7 @@ app.get('/', function(req, res, next) {
 
       var visits = entities.map(function(entity) {
         return format(
-          'Time: %s, Addr: %s',
+          'Time: %s, AddrHash: %s',
           entity.data.timestamp,
           entity.data.userIp);
       });

appengine/disk/app.js

@@ -18,13 +18,17 @@
 var fs = require('fs');
 var util = require('util');
 var express = require('express');
+var crypto = require('crypto');
 
 var app = express();
 app.enable('trust proxy');
 
 app.get('/', function(req, res, next) {
   var instanceId = process.env.GAE_MODULE_INSTANCE || '1';
-  var userIp = util.format('%s\n', req.ip);
+  var hash = crypto.createHash('sha256');
+  // Only store a hash of the ip address
+  var ip = hash.update(req.ip).digest('hex').substr(0, 7);
+  var userIp = util.format('%s\n', ip);
 
   fs.appendFile('/tmp/seen.txt', userIp, function(err) {
     if (err) { return next(err); }

appengine/express-memcached-session/server.js

@@ -18,6 +18,7 @@ var session = require('express-session');
 var cookieParser = require('cookie-parser');
 var MemcachedStore = require('connect-memcached')(session);
 var publicIp = require('public-ip');
+var crypto = require('crypto');
 
 var app = express();
 
@@ -33,9 +34,10 @@ app.use(session({
 
 app.get('/', function(req, res){
   publicIp.v4(function (err, ip) {
+    var hash = crypto.createHash('sha256');
 
-    // This shows the IP for each 
-    res.write('<div>' + ip + '</div>');
+    // This shows the hashed IP for each 
+    res.write('<div>' + hash.update(ip).digest('hex').substr(0, 7) + '</div>');
 
     if(req.session.views) {
       ++req.session.views;