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main.py
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main.py
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#!/usr/bin/env python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import webapp2, cgi
import caesar
def build_page(textarea_content):
rot_label = "<label>Rotate by:</label>"
rotation_input = "<input type='number' name='rotation'/>"
message_label = "<label>Type a message:</label>"
textarea = "<textarea name='message'>" + textarea_content + "</textarea>"
submit = "<input type='submit' >"
form = "<form method='post'>" + rot_label + rotation_input + "<br><br>" + message_label + textarea + "<br>" + submit + "</form>"
head = """
<head>
<title>Web Caesar</title>
<style type="text/css">
.error{
color:red;
}
</style>
</head>
"""
header = "<h2>Web Caesar</h2>"
return head + header + form
def errorElement(error):
error_element = "<p class='error'>" + error + "</p>" if error else ""
return error_element
class MainHandler(webapp2.RequestHandler):
def get(self):
content = build_page("")
error = self.request.get("error")
error_element = errorElement(error) #"<p class='error'>" + error + "</p>" if error else ""
self.response.write(content + error_element)
def post(self):
message = self.request.get("message")
if not self.request.get("rotation"):
error = "Please enter an amount to rotate by"
error_element = errorElement(error) # "<p class='error'>" + error + "</p>" if error else ""
content = build_page(message)
self.response.write(content + error_element)
#self.redirect("/?error=" + error)
else:
error = ""
escaped_message = cgi.escape(message)
encrypted_message = caesar.encrypt(escaped_message, int(self.request.get("rotation")))
content = build_page(encrypted_message)
self.response.write(content + error)
app = webapp2.WSGIApplication([
('/', MainHandler)
], debug=True)