openmedialibrary/oml/item/handlers.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
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from datetime import datetime
import mimetypes
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import os
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from urllib.request import quote
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import zipfile
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from .models import Item
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import db
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import settings
import tornado.web
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class OMLHandler(tornado.web.RequestHandler):
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def initialize(self):
pass
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class EpubHandler(OMLHandler):
def get(self, id, filename):
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with db.session():
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item = Item.get(id)
path = item.get_path()
if not item or item.info['extension'] != 'epub' or not path:
self.set_status(404)
self.write('')
else:
z = zipfile.ZipFile(path)
if filename == '':
self.write('<br>\n'.join([f.filename for f in z.filelist]))
elif filename not in [f.filename for f in z.filelist]:
self.set_status(404)
self.write('')
else:
content_type = {
'xpgt': 'application/vnd.adobe-page-template+xml'
}.get(filename.split('.')[0], mimetypes.guess_type(filename)[0]) or 'text/plain'
self.set_header('Content-Type', content_type)
self.write(z.read(filename))
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def serve_static(handler, path, mimetype, include_body=True, disposition=None):
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handler.set_header('Content-Type', mimetype)
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size = os.stat(path).st_size
handler.set_header('Accept-Ranges', 'bytes')
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if disposition:
handler.set_header('Content-Disposition', "attachment; filename*=UTF-8''%s" % quote(disposition.encode('utf-8')))
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if include_body:
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if 'Range' in handler.request.headers:
handler.set_status(206)
r = handler.request.headers.get('Range').split('=')[-1].split('-')
start = int(r[0])
end = int(r[1]) if r[1] else size
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length = end - start + 1
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handler.set_header('Content-Length', str(length))
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handler.set_header('Content-Range', 'bytes %s-%s/%s' % (start, end, size))
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with open(path, 'rb') as fd:
fd.seek(start)
handler.write(fd.read(length))
else:
handler.set_header('Content-Length', str(size))
with open(path, 'rb') as fd:
handler.write(fd.read())
else:
handler.set_header('Content-Length', str(size))
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return
class FileHandler(OMLHandler):
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def initialize(self, attachment=False):
self._attachment = attachment
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def head(self, id):
self.get(id, include_body=False)
def get(self, id, include_body=True):
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with db.session():
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item = Item.get(id)
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path = item.get_path() if item else None
if not item or not path:
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self.set_status(404)
return
mimetype = {
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'epub': 'application/epub+zip',
'pdf': 'application/pdf',
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'txt': 'text/plain',
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}.get(path.split('.')[-1], None)
if mimetype == 'text/plain':
try:
open(path, 'rb').read().decode('utf-8')
mimetype = 'text/plain; charset=utf-8'
except:
mimetype = 'text/plain; charset=latin-1'
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if self._attachment:
disposition = os.path.basename(path)
else:
disposition = None
return serve_static(self, path, mimetype, include_body, disposition=disposition)
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class ReaderHandler(OMLHandler):
def get(self, id):
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with db.session():
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item = Item.get(id)
if not item:
self.set_status(404)
return
if item.info['extension'] == 'epub':
html = 'html/epub.html'
elif item.info['extension'] == 'pdf':
html = 'html/pdf.html'
elif item.info['extension'] == 'txt':
html = 'html/txt.html'
else:
self.set_status(404)
return
item.accessed = datetime.utcnow()
item.timesaccessed = (item.timesaccessed or 0) + 1
item.update_sort()
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item.save()
return serve_static(self, os.path.join(settings.static_path, html), 'text/html')