First slice of csv upload of phone numbers for sending messages.

At the moment the file contents are not persisted by checked in
memory.

The first and last three records are show if all are valid.

If there are invalid rows, they are reported and the user is
prompted to go back and sort out upload file.

The storing of upload result (i.e. validation of file) in session
will be removed in next story which is about persisting of file
for later processing.

app/main/views/sms.py

@@ -1,7 +1,20 @@
-from flask import request, render_template, redirect, url_for
+import csv
+import re
+
+from flask import (
+    request,
+    render_template,
+    redirect,
+    url_for,
+    session,
+    flash,
+    current_app
+)
+
 from flask_login import login_required
 
 from app.main import main
+from app.main.forms import CsvUploadForm
 
 # TODO move this to the templates directory
 message_templates = [
@@ -23,45 +36,64 @@ message_templates = [
 
 
 @main.route("/sms/send", methods=['GET', 'POST'])
+@login_required
 def sendsms():
-    if request.method == 'GET':
-        return render_template(
-            'views/send-sms.html',
-            message_templates=message_templates
-        )
-    elif request.method == 'POST':
-        return redirect(url_for('.checksms'))
+    form = CsvUploadForm()
+    if form.validate_on_submit():
+        csv_file = form.file.data
+
+        # in memory handing is temporary until next story to save csv file
+        try:
+            results = _build_upload_result(csv_file)
+        except Exception:
+            message = 'There was a problem with the file: {}'.format(
+                      csv_file.filename)
+            flash(message)
+            return redirect(url_for('.sendsms'))
+
+        if not results['valid'] and not results['rejects']:
+            message = "The file {} contained no data".format(csv_file.filename)
+            flash(message, 'error')
+            return redirect(url_for('.sendsms'))
+
+        session[csv_file.filename] = results
+        return redirect(url_for('.checksms', recipients=csv_file.filename))
+
+    return render_template('views/send-sms.html',
+                           message_templates=message_templates,
+                           form=form)
 
 
 @main.route("/sms/check", methods=['GET', 'POST'])
+@login_required
 def checksms():
-
-    recipients = [
-        {'phone': "+44 7700 900989", 'registration number': 'LC12 BFL', 'date': '24 December 2015'},
-        {'phone': "+44 7700 900479", 'registration number': 'DU04 AOM', 'date': '25 December 2015'},
-        {'phone': "+44 7700 900964", 'registration number': 'M91 MJB', 'date': '26 December 2015'},
-        {'phone': "+44 7700 900703", 'registration number': 'Y249 NPU', 'date': '31 December 2015'},
-        {'phone': "+44 7700 900730", 'registration number': 'LG55 UGB', 'date': '1 January 2016'},
-        {'phone': "+44 7700 900989", 'registration number': 'LC12 BFL', 'date': '24 December 2015'},
-        {'phone': "+44 7700 900479", 'registration number': 'DU04 AOM', 'date': '25 December 2015'},
-        {'phone': "+44 7700 900964", 'registration number': 'M91 MJB', 'date': '26 December 2015'},
-        {'phone': "+44 7700 900703", 'registration number': 'Y249 NPU', 'date': '31 December 2015'},
-        {'phone': "+44 7700 900730", 'registration number': 'LG55 UGB', 'date': '1 January 2016'},
-    ]
-
-    number_of_recipients = len(recipients)
-    too_many_recipients_to_display = number_of_recipients > 7
-
     if request.method == 'GET':
+
+        recipients_filename = request.args.get('recipients')
+        # upload results in session until file is persisted in next story
+        upload_result = session.get(recipients_filename)
+        if upload_result.get('rejects'):
+            flash('There was a problem with some of the numbers')
+
         return render_template(
             'views/check-sms.html',
-            number_of_recipients=number_of_recipients,
-            recipients={
-                "first_three": recipients[:3] if too_many_recipients_to_display else [],
-                "last_three": recipients[number_of_recipients - 3:] if too_many_recipients_to_display else [],
-                "all": recipients if not too_many_recipients_to_display else []
-            },
+            upload_result=upload_result,
             message_template=message_templates[0]['body']
         )
     elif request.method == 'POST':
         return redirect(url_for('.showjob'))
+
+
+def _build_upload_result(csv_file):
+    pattern = re.compile(r'^\+44\s?\d{4}\s?\d{6}$')
+    reader = csv.DictReader(
+        csv_file.read().decode('utf-8').splitlines(),
+        lineterminator='\n',
+        quoting=csv.QUOTE_NONE)
+    valid, rejects = [], []
+    for i, row in enumerate(reader):
+        if pattern.match(row['phone']):
+            valid.append(row)
+        else:
+            rejects.append({"line_number": i+2, "phone": row['phone']})
+    return {"valid": valid, "rejects": rejects}