forked from LBRYCommunity/lbry-sdk
417 lines
16 KiB
Python
417 lines
16 KiB
Python
import logging
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import os
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import shutil
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import json
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import sys
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import mimetypes
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import mimetools
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import tempfile
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import time
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import cgi
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from appdirs import user_data_dir
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from twisted.web import server, static, resource
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from twisted.internet import defer, interfaces, error, reactor, threads
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from zope.interface import implements
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from lbrynet.lbrynet_daemon.LBRYDaemon import LBRYDaemon
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from lbrynet.conf import API_ADDRESS, UI_ADDRESS, DEFAULT_UI_BRANCH, LOG_FILE_NAME
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# TODO: omg, this code is essentially duplicated in LBRYDaemon
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if sys.platform != "darwin":
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data_dir = os.path.join(os.path.expanduser("~"), ".lbrynet")
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else:
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data_dir = user_data_dir("LBRY")
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if not os.path.isdir(data_dir):
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os.mkdir(data_dir)
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lbrynet_log = os.path.join(data_dir, LOG_FILE_NAME)
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log = logging.getLogger(__name__)
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class LBRYDaemonRequest(server.Request):
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"""
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For LBRY specific request functionality. Currently just provides
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handling for large multipart POST requests, taken from here:
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http://sammitch.ca/2013/07/handling-large-requests-in-twisted/
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For multipart POST requests, this populates self.args with temp
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file objects instead of strings. Note that these files don't auto-delete
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on close because we want to be able to move and rename them.
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"""
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# max amount of memory to allow any ~single~ request argument [ie: POSTed file]
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# note: this value seems to be taken with a grain of salt, memory usage may spike
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# FAR above this value in some cases.
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# eg: set the memory limit to 5 MB, write 2 blocks of 4MB, mem usage will
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# have spiked to 8MB before the data is rolled to disk after the
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# second write completes.
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memorylimit = 1024*1024*100
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# enable/disable debug logging
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do_log = False
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# re-defined only for debug/logging purposes
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def gotLength(self, length):
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if self.do_log:
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print '%f Headers received, Content-Length: %d' % (time.time(), length)
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server.Request.gotLength(self, length)
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# re-definition of twisted.web.server.Request.requestreceived, the only difference
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# is that self.parse_multipart() is used rather than cgi.parse_multipart()
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def requestReceived(self, command, path, version):
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from twisted.web.http import parse_qs
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if self.do_log:
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print '%f Request Received' % time.time()
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self.content.seek(0,0)
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self.args = {}
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self.stack = []
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self.method, self.uri = command, path
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self.clientproto = version
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x = self.uri.split(b'?', 1)
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if len(x) == 1:
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self.path = self.uri
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else:
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self.path, argstring = x
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self.args = parse_qs(argstring, 1)
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# cache the client and server information, we'll need this later to be
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# serialized and sent with the request so CGIs will work remotely
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self.client = self.channel.transport.getPeer()
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self.host = self.channel.transport.getHost()
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# Argument processing
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args = self.args
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ctype = self.requestHeaders.getRawHeaders(b'content-type')
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if ctype is not None:
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ctype = ctype[0]
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if self.method == b"POST" and ctype:
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mfd = b'multipart/form-data'
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key, pdict = cgi.parse_header(ctype)
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if key == b'application/x-www-form-urlencoded':
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args.update(parse_qs(self.content.read(), 1))
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elif key == mfd:
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try:
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self.content.seek(0,0)
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args.update(self.parse_multipart(self.content, pdict))
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#args.update(cgi.parse_multipart(self.content, pdict))
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except KeyError as e:
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if e.args[0] == b'content-disposition':
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# Parse_multipart can't cope with missing
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# content-dispostion headers in multipart/form-data
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# parts, so we catch the exception and tell the client
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# it was a bad request.
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self.channel.transport.write(
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b"HTTP/1.1 400 Bad Request\r\n\r\n")
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self.channel.transport.loseConnection()
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return
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raise
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self.content.seek(0, 0)
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self.process()
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# re-definition of cgi.parse_multipart that uses a single temporary file to store
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# data rather than storing 2 to 3 copies in various lists.
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def parse_multipart(self, fp, pdict):
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if self.do_log:
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print '%f Parsing Multipart data: ' % time.time()
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rewind = fp.tell() #save cursor
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fp.seek(0,0) #reset cursor
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boundary = ""
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if 'boundary' in pdict:
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boundary = pdict['boundary']
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if not cgi.valid_boundary(boundary):
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raise ValueError, ('Invalid boundary in multipart form: %r'
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% (boundary,))
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nextpart = "--" + boundary
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lastpart = "--" + boundary + "--"
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partdict = {}
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terminator = ""
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while terminator != lastpart:
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c_bytes = -1
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data = tempfile.NamedTemporaryFile(delete=False)
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if terminator:
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# At start of next part. Read headers first.
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headers = mimetools.Message(fp)
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clength = headers.getheader('content-length')
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if clength:
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try:
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c_bytes = int(clength)
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except ValueError:
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pass
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if c_bytes > 0:
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data.write(fp.read(c_bytes))
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# Read lines until end of part.
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while 1:
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line = fp.readline()
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if not line:
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terminator = lastpart # End outer loop
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break
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if line[:2] == "--":
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terminator = line.strip()
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if terminator in (nextpart, lastpart):
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break
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data.write(line)
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# Done with part.
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if data.tell() == 0:
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continue
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if c_bytes < 0:
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# if a Content-Length header was not supplied with the MIME part
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# then the trailing line break must be removed.
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# we have data, read the last 2 bytes
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rewind = min(2, data.tell())
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data.seek(-rewind, os.SEEK_END)
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line = data.read(2)
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if line[-2:] == "\r\n":
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data.seek(-2, os.SEEK_END)
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data.truncate()
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elif line[-1:] == "\n":
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data.seek(-1, os.SEEK_END)
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data.truncate()
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line = headers['content-disposition']
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if not line:
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continue
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key, params = cgi.parse_header(line)
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if key != 'form-data':
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continue
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if 'name' in params:
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name = params['name']
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# kludge in the filename
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if 'filename' in params:
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fname_index = name + '_filename'
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if fname_index in partdict:
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partdict[fname_index].append(params['filename'])
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else:
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partdict[fname_index] = [params['filename']]
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else:
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# Unnamed parts are not returned at all.
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continue
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data.seek(0,0)
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if name in partdict:
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partdict[name].append(data)
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else:
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partdict[name] = [data]
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fp.seek(rewind) # Restore cursor
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return partdict
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class LBRYindex(resource.Resource):
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def __init__(self, ui_dir):
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resource.Resource.__init__(self)
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self.ui_dir = ui_dir
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isLeaf = False
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def _delayed_render(self, request, results):
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request.write(str(results))
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request.finish()
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def getChild(self, name, request):
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if name == '':
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return self
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return resource.Resource.getChild(self, name, request)
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def render_GET(self, request):
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request.setHeader('cache-control','no-cache, no-store, must-revalidate')
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request.setHeader('expires', '0')
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return static.File(os.path.join(self.ui_dir, "index.html")).render_GET(request)
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class LBRYFileStreamer(object):
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"""
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Writes downloaded LBRY file to request as the download comes in, pausing and resuming as requested
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used for Chrome
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"""
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implements(interfaces.IPushProducer)
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def __init__(self, request, path, start, stop, size):
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self._request = request
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self._fileObject = file(path)
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self._content_type = mimetypes.guess_type(path)[0]
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self._stop_pos = size - 1 if stop == '' else int(stop) #chrome and firefox send range requests for "0-"
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self._cursor = self._start_pos = int(start)
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self._file_size = size
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self._depth = 0
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self._paused = self._sent_bytes = self._stopped = False
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self._delay = 0.25
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self._deferred = defer.succeed(None)
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self._request.setResponseCode(206)
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self._request.setHeader('accept-ranges', 'bytes')
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self._request.setHeader('content-type', self._content_type)
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self._request.setHeader("Content-Security-Policy", "sandbox")
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self.resumeProducing()
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def pauseProducing(self):
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self._paused = True
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log.info("Pausing producer")
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return defer.succeed(None)
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def resumeProducing(self):
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def _check_for_new_data():
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self._depth += 1
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self._fileObject.seek(self._start_pos, os.SEEK_END)
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readable_bytes = self._fileObject.tell()
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self._fileObject.seek(self._cursor)
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self._sent_bytes = False
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if (readable_bytes > self._cursor) and not (self._stopped or self._paused):
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read_length = min(readable_bytes, self._stop_pos) - self._cursor + 1
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self._request.setHeader('content-range', 'bytes %s-%s/%s' % (self._cursor, self._cursor + read_length - 1, self._file_size))
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self._request.setHeader('content-length', str(read_length))
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start_cur = self._cursor
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for i in range(read_length):
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if self._paused or self._stopped:
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break
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else:
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data = self._fileObject.read(1)
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self._request.write(data)
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self._cursor += 1
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log.info("Wrote range %s-%s/%s, length: %s, readable: %s, depth: %s" %
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(start_cur, self._cursor, self._file_size, self._cursor - start_cur, readable_bytes, self._depth))
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self._sent_bytes = True
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if self._cursor == self._stop_pos + 1:
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self.stopProducing()
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return defer.succeed(None)
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elif self._paused or self._stopped:
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return defer.succeed(None)
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else:
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self._deferred.addCallback(lambda _: threads.deferToThread(reactor.callLater, self._delay, _check_for_new_data))
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return defer.succeed(None)
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log.info("Resuming producer")
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self._paused = False
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self._deferred.addCallback(lambda _: _check_for_new_data())
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def stopProducing(self):
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log.info("Stopping producer")
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self._stopped = True
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# self._fileObject.close()
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self._deferred.addErrback(lambda err: err.trap(defer.CancelledError))
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self._deferred.addErrback(lambda err: err.trap(error.ConnectionDone))
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self._deferred.cancel()
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# self._request.finish()
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self._request.unregisterProducer()
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return defer.succeed(None)
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class HostedLBRYFile(resource.Resource):
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def __init__(self, api):
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self._api = api
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self._producer = None
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resource.Resource.__init__(self)
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# todo: fix LBRYFileStreamer and use it instead of static.File
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# def makeProducer(self, request, stream):
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# def _save_producer(producer):
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# self._producer = producer
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# return defer.succeed(None)
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#
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# range_header = request.getAllHeaders()['range'].replace('bytes=', '').split('-')
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# start, stop = int(range_header[0]), range_header[1]
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# log.info("GET range %s-%s" % (start, stop))
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# path = os.path.join(self._api.download_directory, stream.file_name)
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#
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# d = stream.get_total_bytes()
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# d.addCallback(lambda size: _save_producer(LBRYFileStreamer(request, path, start, stop, size)))
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# d.addCallback(lambda _: request.registerProducer(self._producer, streaming=True))
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# # request.notifyFinish().addCallback(lambda _: self._producer.stopProducing())
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# request.notifyFinish().addErrback(self._responseFailed, d)
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# return d
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def render_GET(self, request):
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request.setHeader("Content-Security-Policy", "sandbox")
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if 'name' in request.args.keys():
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if request.args['name'][0] != 'lbry' and request.args['name'][0] not in self._api.waiting_on.keys():
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d = self._api._download_name(request.args['name'][0])
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# d.addCallback(lambda stream: self.makeProducer(request, stream))
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d.addCallback(lambda stream: static.File(os.path.join(self._api.download_directory,
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stream.file_name)).render_GET(request))
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elif request.args['name'][0] in self._api.waiting_on.keys():
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request.redirect(UI_ADDRESS + "/?watch=" + request.args['name'][0])
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request.finish()
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else:
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request.redirect(UI_ADDRESS)
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request.finish()
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return server.NOT_DONE_YET
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# def _responseFailed(self, err, call):
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# call.addErrback(lambda err: err.trap(error.ConnectionDone))
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# call.addErrback(lambda err: err.trap(defer.CancelledError))
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# call.addErrback(lambda err: log.info("Error: " + str(err)))
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# call.cancel()
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class LBRYFileUpload(resource.Resource):
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"""
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Accepts a file sent via the file upload widget in the web UI, saves
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it into a temporary dir, and responds with a JSON string containing
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the path of the newly created file.
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"""
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def __init__(self, api):
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self._api = api
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def render_POST(self, request):
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origfilename = request.args['file_filename'][0]
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uploaded_file = request.args['file'][0] # Temp file created by request
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# Move to a new temporary dir and restore the original file name
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newdirpath = tempfile.mkdtemp()
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newpath = os.path.join(newdirpath, origfilename)
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if os.name == "nt":
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shutil.copy(uploaded_file.name, newpath)
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# TODO Still need to remove the file
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# TODO deal with pylint error in cleaner fashion than this
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try:
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from exceptions import WindowsError as win_except
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except ImportError as e:
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log.error("This shouldn't happen")
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win_except = Exception
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try:
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os.remove(uploaded_file.name)
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except win_except as e:
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pass
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else:
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shutil.move(uploaded_file.name, newpath)
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self._api.uploaded_temp_files.append(newpath)
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return json.dumps(newpath)
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class LBRYDaemonServer(object):
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def _setup_server(self, wallet):
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self.root = LBRYindex(os.path.join(os.path.join(data_dir, "lbry-ui"), "active"))
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self._api = LBRYDaemon(self.root, wallet_type=wallet)
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self.root.putChild("view", HostedLBRYFile(self._api))
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self.root.putChild("upload", LBRYFileUpload(self._api))
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self.root.putChild(API_ADDRESS, self._api)
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return defer.succeed(True)
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def start(self, branch=DEFAULT_UI_BRANCH, user_specified=False, branch_specified=False, wallet=None):
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d = self._setup_server(wallet)
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d.addCallback(lambda _: self._api.setup(branch, user_specified, branch_specified))
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return d
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