Add simple function for uploading OFX-based transactions

The OFX direct connection for my bank isn't working right now. I have a
support ticket in. Until then I'm going to work on doing a manual upload
and parse of transactions from this OFX document

templates/account.html

@@ -29,4 +29,10 @@
 {% else %}
   <p>This account does not have any transactions yet</p>
 {% endif %}
+<form method="POST" action="/transactions/" enctype="multipart/form-data">
+  <p>Want to upload your own transactions? Cool. Do it here.</p>
+  <input type="hidden" name="account_uuid" value="{{ account.uuid }}">
+  <input type="file" name="transactions" id="transactions">
+  <input type="submit">
+</form>
 {% endblock %}

vanth/pages/accounts.py

@@ -1,10 +1,14 @@
+import logging
+
 import flask
+import werkzeug.utils
 
 import vanth.celery
 import vanth.pages.tools
 import vanth.platform.ofxaccount
 import vanth.platform.ofxsource
 
+LOGGER = logging.getLogger()
 blueprint = flask.Blueprint('accounts', __name__)
 
 @blueprint.route('/accounts/', methods=['GET'])
@@ -40,3 +44,18 @@ def post_account(arguments):
 def post_update(arguments):
     vanth.celery.update_account.delay(**arguments)
     return flask.redirect('/accounts/')
+
+@blueprint.route('/transactions/', methods=['POST'])
+@vanth.pages.tools.parse({
+    'account_uuid'  : str,
+})
+def post_transactions(arguments):
+    if 'transactions' not in flask.request.files:
+        return flask.render_template('error.html', error="You did not include the content of the file in your upload")
+    transactions = flask.request.files['transactions']
+    if transactions.filename == '':
+        return flask.redirect('/accounts/{}/'.format(arguments['account_uuid']))
+    filename = werkzeug.utils.secure_filename(transactions.filename)
+    LOGGER.info("Saving uploaded file %s to %s", transactions.filename, filename)
+    transactions.save(filename)
+    return flask.redirect('/accounts/{}/'.format(arguments['account_uuid']))