Start #25: Read imported file into browser

Add a conditional to the controller to handle POST requests.  For now,
this reads the file into a variable and then sends it back to the
browser.  We'll do something different in the next commit.  Add a POST
route pointing to the controller.  Add a form to the front page to
receive the file for import (I'll have to move this, since it's right
above the search bar now).

app/controllers/core.server.controller.js

@@ -4,8 +4,27 @@
  * Module dependencies.
  */
 exports.index = function(req, res) {
-  res.render('index', {
-    user: req.user || null,
-    request: req
-  });
+    var qs = require('querystring');
+    if (req.method == "POST"){
+        var body = '';
+        req.on('data', function (data) {
+            body += data;
+            if (body.length > 1e6) { 
+                req.connection.destroy();
+            }
+        });
+        req.on('end', function () {
+            // naming this "file_data" because I assume that we will
+            // only be POST-ing imported files.  This may change in the
+            // future.
+            var file_data = qs.parse(body);
+            res.send(file_data);
+        });
+    }
+    else{
+        res.render('index', {
+            user: req.user || null,
+            request: req
+        });
+    }
 };

app/routes/core.server.routes.js

@@ -4,4 +4,5 @@ module.exports = function(app) {
   // Root routing
   var core = require('../../app/controllers/core.server.controller');
   app.route('/').get(core.index);
+  app.route('/upload').post(core.index); 
 };

app/views/index.jade

@@ -25,6 +25,9 @@ html(lang="en")
         img(src='img/OpenHMIS-logo.jpg')
       div#search
         h1 Client Search
+        form(action="/upload", method="post", enctype="multipart/form-data")
+          input#import_file(type='file' name="import.csv")
+          button#importAll(type='submit')
         form#searchForm
           div.form-group
             input#searchField.form-control(name='searchField', type='text', placeholder='search by first or last name')

public/js/index.js

@@ -92,6 +92,7 @@ $(function() {
     var revertText = "Revert Changes";
     var backText = "Back to Results";
     var exportAllText = "Example Export -- All Clients and Enrollments";
+    var importAllText = "Example Import";
 
     /*
      * Takes a user-entered string and returns the number of matching
@@ -309,6 +310,7 @@ $(function() {
             $("#searchForm #results").empty();
             $("#addNewClient").text(noCaveatText);
             $("#exportAll").text(exportAllText);
+            $("#importAll").text(importAllText);
             $("#searchForm #addNewClient").prop("disabled", true);
         }
         $("#search").css("display", "block");