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#!/usr/bin/python
from wsgiref.simple_server import make_server
import math
import json
from copy import deepcopy
import re
from hashlib import sha1
from base64 import b32encode
import random
import optparse
from dmedia.ui import load_datafile
from dmedia.wsgi import *
LEAF_SIZE = 4 * 2**20 # 8 MiB
def b32_sha1(chunk):
return b32encode(sha1(chunk).digest())
class App(BaseWSGI):
def __init__(self, data, fail):
super(App, self).__init__()
self.data = data
self.fail = fail
self.sessions = {}
def key(self, obj):
return obj['quick_id']
def init(self, obj):
key = self.key(obj)
try:
return deepcopy(self.sessions[key])
except KeyError:
pass
d = dict(
(k, obj[k]) for k in ['bytes', 'quick_id']
)
self.sessions[key] = d
size = d['bytes']
d['leaves'] = [
None for i in xrange(int(math.ceil(size / float(LEAF_SIZE))))
]
d['leaf_size'] = LEAF_SIZE
return d
def get_session(self, quick_id):
if self.fail and random.randint(0, 3) == 0:
self.sessions.pop(quick_id, None)
try:
return self.sessions[quick_id]
except KeyError:
raise Conflict()
@http_method
def GET(self, environ, start_response):
path_info = environ['PATH_INFO']
try:
(body, mime) = self.data[path_info]
except KeyError:
raise NotFound()
headers = [
('Content-Type', mime),
('Content-Length', str(len(body)).encode('utf-8'))
]
start_response('200 OK', headers)
return body
@http_method
def POST(self, environ, start_response):
content_type = environ.get('CONTENT_TYPE', '')
if not content_type.startswith('application/json'):
raise UnsupportedMediaType()
path_info = environ['PATH_INFO']
obj = json.loads(read_input(environ))
print obj
if path_info == '/':
d = self.init(obj)
return self.json(d, environ, start_response)
m = re.match('/([A-Z0-9]{32})$', path_info)
if m:
quick_id = m.group(1)
session = self.get_session(quick_id)
return self.json(session, environ, start_response)
raise BadRequest()
@http_method
def PUT(self, environ, start_response):
content_type = environ.get('CONTENT_TYPE', '')
if not content_type.startswith('application/octet-stream'):
raise UnsupportedMediaType()
path_info = environ['PATH_INFO']
m = re.match('/([A-Z0-9]{32})/(\d+)$', path_info)
if not m:
raise BadRequest()
quick_id = m.group(1)
session = self.get_session(quick_id)
i = int(m.group(2))
chash = environ.get('HTTP_X_DMEDIA_CHASH')
leaf = read_input(environ)
if self.fail and random.randint(0, 1) == 1:
leaf += b'corruption'
got = b32_sha1(leaf)
d = {
'quick_id': quick_id,
'index': i,
'received': got,
}
if got == chash:
session['leaves'][i] = chash
return self.json(d, environ, start_response)
else:
d['expected'] = chash
return self.json(d, environ, start_response,
'412 Precondition Failed'
)
def json(self, d, environ, start_response, status='201 Created'):
body = json.dumps(d, sort_keys=True, indent=4)
headers = [
('Content-Type', 'application/json'),
('Content-Length', str(len(body)).encode('utf-8'))
]
start_response(status, headers)
print body
return body
index = """<!DOCTYPE html>
<html>
<head>
<title>HTML5 File upload test</title>
<script type="text/javascript" src="sha1.js"></script>
<script type="text/javascript" src="base32.js"></script>
<script type="text/javascript" src="uploader.js"></script>
<script type="text/javascript">
function log() {
var parent = document.getElementById('log');
if (! parent) {
return;
}
var args = Array.prototype.slice.call(arguments);
var msg = args.join(' ');
var pre = document.createElement('pre');
pre.textContent = msg;
parent.appendChild(pre);
}
function on_request(request) {
log('RESPONSE:', request.status, request.statusText);
log(request.responseText);
}
function on_progress(completed, total) {
var progress = document.getElementById('progress');
progress.textContent = completed + ' of ' + total;
}
function handle(files) {
document.getElementById('progress').textContent = '';
document.getElementById('log').textContent = '';
var u = new Uploader('/');
u.onrequest = on_request;
u.onprogress = on_progress;
var file = files[0];
u.upload(file);
}
</script>
</head>
<body>
<form>
<input type="file" id="file" onchange="handle(this.files)" />
</form>
<div><strong id="progress"></strong></div>
<div id="log"></div>
</body>
</html>"""
data = {
'/': (
index,
'text/html; charset=UTF-8'
),
'/sha1.js': (
load_datafile('sha1.js'),
'application/javascript; charset=UTF-8'
),
'/base32.js': (
load_datafile('base32.js'),
'application/javascript; charset=UTF-8'
),
'/uploader.js': (
load_datafile('uploader.js'),
'application/javascript; charset=UTF-8'
),
}
parser = optparse.OptionParser()
parser.add_option('--fail',
help='add random data corruption and server failures',
action='store_true',
default=False,
)
(options, args) = parser.parse_args()
app = App(data, options.fail)
httpd = make_server('', 8000, app)
httpd.serve_forever()
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