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#!/usr/bin/env python
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# Todo:
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#
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# - file uploads should be saved to temp files and passed to the callback.
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# - Ignore non-existing temp files in upload cleanup.
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# - How does script_raw check the exitcode? Document this.
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# - Validate field values properly.
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# * Integer/float min, max
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# * Uploaded files mime-types/extensions
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import sys
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import optparse
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import os
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import stat
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import json
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import BaseHTTPServer
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from BaseHTTPServer import BaseHTTPRequestHandler
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from SocketServer import ThreadingMixIn
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import cgi
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import re
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import datetime
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import subprocess
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html_header = '''<html>
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<head>
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<style>
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.btn {{ color: #FFFFFF; font-weight: bold; font-size: 0.90em;
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background-color: #1D98E4; border-color: #1D98E4; padding: 9px;
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border-radius: 4px; border-width: 0px; text-decoration: none;
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}}
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.error {{ color: #FF0000; }}
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*,body {{ font-family: sans-serif; }}
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h1 {{ color: #555555; text-align: center; margin: 32px auto 32px auto; }}
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pre {{ font-family: monospace; }}
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/* List of available forms */
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div.list {{ width: 50%; margin: 40px auto 0px auto; }}
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div.list li {{ font-size: 0.90em; list-style: none;
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margin-bottom: 65px; }}
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div.list h2 {{ background-color: #E0E5E5;
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border-radius: 3px; font-weight: bold;
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padding: 10px; font-size: 1.2em; }}
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div.list p.form-description {{ margin-left: 25px; }}
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div.list a.form-link {{ margin-left: 25px; }}
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/* Form display */
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div.form {{ width: 50%; margin: 40px auto 0px auto; }}
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div.form h2 {{ font-weight: bold; background-color: #E0E5E5; padding: 25px;
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border-radius: 10px; }}
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div.form p.form-description {{ font-size: 0.90em;
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margin: 40px 25px 65px 25px; }}
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div.form li {{ font-size: 0.90em; list-style: none; }}
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div.form p.form-field-title {{ margin-bottom: 0px; }}
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div.form p.form-field-input {{ margin-top: 0px; }}
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select,
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textarea,
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input[type=text],
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input[type=number],
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input[type=date],
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input[type=password],
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input[type=submit] {{ color: #606060; padding: 9px; border-radius: 4px;
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border: 1px solid #D0D0D0;
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background-color: #F9F9F9;}}
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input[type=submit] {{ color: #FFFFFF; font-weight: bold;
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background-color: #1D98E4; border-color: #1D98E4}}
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textarea {{ width: 80%; height: 120px; }}
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/* Result display */
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div.result {{ width: 50%; margin: 40px auto 0px auto; }}
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div.result h2 {{ background-color: #E0E5E5; border-radius: 3px;
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font-weight: bold; padding: 10px; }}
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div.result div.result-result {{ margin-left: 25px; }}
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div.result ul {{ margin-top: 64px; padding-left: 0px; }}
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div.result ul li {{ list-style: none; float: left; margin-right: 20px;
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font-size: 0.90em; }}
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div.result ul.nav {{ margin-bottom: 128px; }}
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</style>
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</head>
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<body>
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<h1>{title}</h1>
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<div class="page">
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'''
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html_footer = '''
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</div>
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</body>
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</html>
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'''
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def cmd(cmd, input=None, env=None):
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"""
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Run command `cmd` in a shell. `input` (string) is passed in the
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process' STDIN.
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Returns a dictionary: `{'stdout': <string>, 'stderr': <string>, 'exitcode':
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<int>}`.
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"""
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p = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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env=env)
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stdout, stderr = p.communicate(input)
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return {
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'stdout': stdout,
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'stderr': stderr,
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'exitcode': p.returncode
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}
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class FormDefinition:
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"""
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FormDefinition holds information about a single form and provides methods
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for validation of the form values.
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"""
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def __init__(self, name, title, description, fields, script=None,
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submit_title="Submit"):
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self.name = name
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self.title = title
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self.description = description
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self.fields = fields
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self.script = script
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self.submit_title = submit_title
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def get_field(self, field_name):
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for field in self.fields:
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if field['name'] == field_name:
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return field
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def validate(self, form_values):
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"""
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Validate all relevant fields for this form against form_values.
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"""
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values = {}
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for field_name in form_values:
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if field_name == 'form_name':
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continue
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v = self.validate_field(field_name,
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form_values.getfirst(field_name))
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if v is not None:
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values[field_name] = v
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# Make sure all required fields are there
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for field in self.fields:
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if 'required' in field and \
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field['required'] is True and \
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field['name'] not in values:
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raise ValueError(
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"Required field {} not present".format(field['name']))
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return values
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def validate_field(self, field_name, value):
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"""
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Validate a field in this form.
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"""
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# Find field definition by iterating through all the fields.
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field_def = self.get_field(field_name)
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if not field_def:
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raise KeyError("Unknown field: {}".format(field_name))
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field_type = field_def['type']
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validate_cb = getattr(self, 'validate_{}'.format(field_type), None)
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if not validate_cb:
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return value
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else:
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return validate_cb(field_def, value)
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def validate_integer(self, field_def, value):
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try:
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int(value)
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return value
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except ValueError:
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if field_def.get('required', False):
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raise
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return None
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def validate_float(self, field_def, value):
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try:
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return float(value)
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except ValueError:
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if field_def.get('required', False):
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raise
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return None
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def validate_date(self, field_def, value):
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m = re.match('([0-9]{4})-([0-9]{2})-([0-9]{2})', value)
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if m:
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return value
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elif field_def.get('required', False):
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raise ValueError(
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"Invalid value for date field: {}".format(value))
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return None
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def validate_radio(self, field_def, value):
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if not value in [o[0] for o in field_def['options']]:
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raise ValueError(
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"Invalid value for radio button: {}".format(value))
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return value
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def validate_select(self, field_def, value):
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if not value in [o[0] for o in field_def['options']]:
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raise ValueError(
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"Invalid value for dropdown: {}".format(value))
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return value
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class ThreadedHTTPServer(ThreadingMixIn, BaseHTTPServer.HTTPServer):
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pass
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class WebSrv:
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"""
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Very basic web server.
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"""
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def __init__(self, request_handler, listen_addr='', listen_port=80):
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httpd = ThreadedHTTPServer((listen_addr, listen_port), request_handler)
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httpd.serve_forever()
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class WebAppHandler(BaseHTTPRequestHandler):
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"""
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Basic web server request handler. Handles GET and POST requests. This class
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should be extended with methods (starting with 'h_') to handle the actual
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requests. If no path is set, it dispatches to the 'index' or 'default'
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method.
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"""
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def do_GET(self):
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self.call(*self.parse(self.path))
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def do_POST(self):
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form_values = cgi.FieldStorage(
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fp=self.rfile,
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headers=self.headers,
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environ={'REQUEST_METHOD': 'POST'})
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self.call(self.path.strip('/'), params={'form_values': form_values})
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def parse(self, reqinfo):
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if '?' in reqinfo:
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path, params = reqinfo.split('?', 1)
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params = dict(
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[p.split('=', 1) for p in params.split('&') if '=' in p]
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)
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return (path.strip('/'), params)
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else:
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return (self.path.strip('/'), {})
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def call(self, path, params):
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"""
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Find a method to call on self.app_class based on `path` and call it.
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"""
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response_code = 200
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method_name = 'h_{}'.format(path)
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try:
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if hasattr(self, method_name) and \
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callable(getattr(self, method_name)):
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out = getattr(self, method_name)(**params)
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elif path == '' and hasattr(self, 'index'):
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out = self.index(**params)
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elif hasattr(self, 'default'):
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out = self.default(**params)
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else:
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response_code = 404
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out = 'Not Found'
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except Exception, e:
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self.wfile.write(e)
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raise
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self.send_response(response_code)
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self.send_header('Content-type', 'text/html')
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self.end_headers()
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self.wfile.write(out)
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class ScriptFormWebApp(WebAppHandler):
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"""
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This class is a request handler for WebSrv.
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"""
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def index(self):
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return self.h_list()
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def h_list(self):
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h_form_list = []
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for form_name, form_def in self.vitaform.forms.items():
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h_form_list.append('''
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<li>
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<h2 class="form-title">{title}</h2>
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<p class="form-description">{description}</p>
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<a class="form-link btn" href="/form?form_name={name}">
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{title}
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</a>
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</li>
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'''.format(title=form_def.title,
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description=form_def.description,
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name=form_name)
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)
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return '''
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{header}
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<div class="list">
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{form_list}
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</div>
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{footer}
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'''.format(header=html_header.format(title=self.vitaform.title),
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footer=html_footer,
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form_list=''.join(h_form_list))
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def h_form(self, form_name):
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field_tpl = {
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"string": '<input {} type="text" name="{}" />',
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"number": '<input {} type="number" min="{}" max="{}" name="{}" />',
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"integer": '<input {} type="number" min="{}" max="{}" name="{}" />',
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"float": '<input {} type="number" min="{}" max="{}" name="{}" />',
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"date": '<input {} type="date" name="{}" />',
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"file": '<input {} type="file" name="{}" />',
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"password": '<input {} type="password" name="{}" />',
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"text": '<textarea {} name="{}"></textarea>',
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"select": '<option value="{}">{}</option>',
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"radio": '<input checked type="radio" name="{}" value="{}">{}<br/>',
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}
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def render_field(field):
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tpl = field_tpl[field['type']]
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required = ''
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if field.get('required', None):
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required='required'
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if field['type'] == 'string':
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input = tpl.format(required, field['name'])
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elif field['type'] == 'number' or \
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field['type'] == 'integer' or \
|
|
|
|
|
field['type'] == 'float':
|
|
|
|
|
input = tpl.format(required, field.get('min', ''),
|
|
|
|
|
field.get('max', ''),
|
|
|
|
|
field['name'])
|
|
|
|
|
elif field['type'] == 'date':
|
|
|
|
|
input = tpl.format(required, field['name'])
|
|
|
|
|
elif field['type'] == 'file':
|
|
|
|
|
input = tpl.format(required, field['name'])
|
|
|
|
|
elif field['type'] == 'password':
|
|
|
|
|
input = tpl.format(required, field['name'])
|
|
|
|
|
elif field['type'] == 'radio':
|
|
|
|
|
input = ''.join(
|
|
|
|
|
[
|
|
|
|
|
tpl.format(field['name'], o[0], o[1])
|
|
|
|
|
for o in field['options']
|
|
|
|
|
]
|
|
|
|
|
)
|
|
|
|
|
elif field['type'] == 'text':
|
|
|
|
|
input = tpl.format(required, field['name'])
|
|
|
|
|
elif field['type'] == 'select':
|
|
|
|
|
options = ''.join([
|
|
|
|
|
tpl.format(o[0], o[1]) for o in field['options']
|
|
|
|
|
]
|
|
|
|
|
)
|
|
|
|
|
input = '<select {} name="{}">{}</select>'.format(required, field['name'], options)
|
|
|
|
|
else:
|
|
|
|
|
raise ValueError("Unsupported field type: {}".format(
|
|
|
|
|
field['type'])
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
return ('''
|
|
|
|
|
<li>
|
|
|
|
|
<p class="form-field-title">{title}</p>
|
|
|
|
|
<p class="form-field-input">{input}</p>
|
|
|
|
|
</li>
|
|
|
|
|
'''.format(title=field['title'],
|
|
|
|
|
input=input))
|
|
|
|
|
|
|
|
|
|
form = self.vitaform.get_form(form_name)
|
|
|
|
|
|
|
|
|
|
return '''
|
|
|
|
|
{header}
|
|
|
|
|
<div class="form">
|
|
|
|
|
<h2 class="form-title">{title}</h2>
|
|
|
|
|
<p class="form-description">{description}</p>
|
|
|
|
|
<form action="submit" method="post" enctype="multipart/form-data">
|
|
|
|
|
<input type="hidden" name="form_name" value="{name}" />
|
|
|
|
|
<ul>
|
|
|
|
|
{fields}
|
|
|
|
|
<li><input type="submit" value="{submit_title}" /></li>
|
|
|
|
|
</ul>
|
|
|
|
|
</form>
|
|
|
|
|
</div>
|
|
|
|
|
{footer}
|
|
|
|
|
'''.format(
|
|
|
|
|
header=html_header.format(title=self.vitaform.title),
|
|
|
|
|
footer=html_footer,
|
|
|
|
|
title=form.title,
|
|
|
|
|
description=form.description,
|
|
|
|
|
name=form.name,
|
|
|
|
|
fields=''.join([render_field(f) for f in form.fields]),
|
|
|
|
|
submit_title=form.submit_title
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
def h_submit(self, form_values):
|
|
|
|
|
form_name = form_values.getfirst('form_name', None)
|
|
|
|
|
|
|
|
|
|
# Validate the form values
|
|
|
|
|
form = self.vitaform.get_form(form_name)
|
|
|
|
|
values = form.validate(form_values)
|
|
|
|
|
|
|
|
|
|
# Call user's callback
|
|
|
|
|
if form.script:
|
|
|
|
|
# Run an external script
|
|
|
|
|
env = os.environ.copy()
|
|
|
|
|
env.update(values)
|
|
|
|
|
res = cmd(form.script, env=env)
|
|
|
|
|
if res['exitcode'] != 0:
|
|
|
|
|
result = '<span class="error">{}</span>'.format(res['stderr'])
|
|
|
|
|
else:
|
|
|
|
|
result = '<pre>{}</pre>'.format(res['stdout'])
|
|
|
|
|
else:
|
|
|
|
|
# Run a python callback
|
|
|
|
|
callback = self.callbacks[form_name]
|
|
|
|
|
result = callback(values)
|
|
|
|
|
|
|
|
|
|
return '''
|
|
|
|
|
{header}
|
|
|
|
|
<div class="result">
|
|
|
|
|
<h2 class="result-title">{title}</h2>
|
|
|
|
|
<h3 class="result-subtitle">Result</h3>
|
|
|
|
|
<div class="result-result">{result}</div>
|
|
|
|
|
<ul class="nav">
|
|
|
|
|
<li>
|
|
|
|
|
<a class="back-list btn" href="/">Back to the list</a>
|
|
|
|
|
</li>
|
|
|
|
|
<li>
|
|
|
|
|
<a class="back-form btn" href="/form?form_name={form_name}">
|
|
|
|
|
Back to the form
|
|
|
|
|
</a>
|
|
|
|
|
</li>
|
|
|
|
|
</ul>
|
|
|
|
|
</div>
|
|
|
|
|
{footer}
|
|
|
|
|
'''.format(
|
|
|
|
|
header=html_header.format(title=self.vitaform.title),
|
|
|
|
|
footer=html_footer,
|
|
|
|
|
title=form.title,
|
|
|
|
|
form_name=form.name,
|
|
|
|
|
result=result,
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class ScriptForm:
|
|
|
|
|
"""
|
|
|
|
|
'Main' class that orchestrates parsing the Form definition file
|
|
|
|
|
`config_file`, hooking up callbacks and running the webserver.
|
|
|
|
|
"""
|
|
|
|
|
def __init__(self, config_file, callbacks={}):
|
|
|
|
|
self.forms = {}
|
|
|
|
|
self.callbacks = {}
|
|
|
|
|
self.title = 'ScriptForm Actions'
|
|
|
|
|
self.basepath = os.path.realpath(os.path.dirname(config_file))
|
|
|
|
|
|
|
|
|
|
self._load_config(config_file)
|
|
|
|
|
for form_name, cb in callbacks.items():
|
|
|
|
|
self.callbacks[form_name] = cb
|
|
|
|
|
|
|
|
|
|
# Validate scripts
|
|
|
|
|
for form_name, form_def in self.forms.items():
|
|
|
|
|
if form_def.script:
|
|
|
|
|
if not stat.S_IXUSR & os.stat(form_def.script)[stat.ST_MODE]:
|
|
|
|
|
raise Exception("{} is not executable".format(form_def.script))
|
|
|
|
|
else:
|
|
|
|
|
if not form_name in self.callbacks:
|
|
|
|
|
raise Exception("No script or callback registered for '{}'".format(form_name))
|
|
|
|
|
|
|
|
|
|
def _load_config(self, path):
|
|
|
|
|
config = json.load(file(path, 'r'))
|
|
|
|
|
if 'title' in config:
|
|
|
|
|
self.title = config['title']
|
|
|
|
|
for form_name, form in config['forms'].items():
|
|
|
|
|
if 'script' in form:
|
|
|
|
|
script = os.path.join(self.basepath, form['script'])
|
|
|
|
|
else:
|
|
|
|
|
script = None
|
|
|
|
|
self.forms[form_name] = \
|
|
|
|
|
FormDefinition(form_name,
|
|
|
|
|
form['title'],
|
|
|
|
|
form['description'],
|
|
|
|
|
form['fields'],
|
|
|
|
|
script,
|
|
|
|
|
submit_title=form.get('submit_title', None))
|
|
|
|
|
|
|
|
|
|
def get_form(self, form_name):
|
|
|
|
|
return self.forms[form_name]
|
|
|
|
|
|
|
|
|
|
def run(self, listen_addr='0.0.0.0', listen_port=80):
|
|
|
|
|
ScriptFormWebApp.vitaform = self
|
|
|
|
|
ScriptFormWebApp.callbacks = self.callbacks
|
|
|
|
|
WebSrv(ScriptFormWebApp, listen_addr=listen_addr, listen_port=listen_port)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
|
parser = optparse.OptionParser()
|
|
|
|
|
parser.set_usage(sys.argv[0] + " [option] <form_definition.json>")
|
|
|
|
|
|
|
|
|
|
parser.add_option("-p", "--port", dest="port", action="store", type="int", default=80, help="Port to listen on.")
|
|
|
|
|
|
|
|
|
|
(options, args) = parser.parse_args()
|
|
|
|
|
if len(args) < 1:
|
|
|
|
|
parser.error("Insufficient number of arguments")
|
|
|
|
|
|
|
|
|
|
sf = ScriptForm(args[0])
|
|
|
|
|
sf.run(listen_port=options.port)
|
