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radiomatejson.cgi
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radiomatejson.cgi
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#!/usr/bin/env python
# vim:fileencoding=utf-8:syntax=python:nomodified
#
# Copyright 2010 Claudio Pisa (clauz at ninux dot org)
#
# This file is part of RadioMate
#
# RadioMate is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# RadioMate is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with RadioMate. If not, see <http://www.gnu.org/licenses/>.
#
import cgitb
cgitb.enable()
import cgi
import radiomate.jsonif
from radiomate.config import MEDIAFILESHOMEDIR
import sys
import os
import time
FILEUPLOADKEY = 'upload'
def isMp3Valid(file_path):
"thanks to Peter Carroll http://blog.eringal.com/python/verifying-that-an-mp3-file-is-valid-in-python/"
is_valid = False
f = open(file_path, 'r')
block = f.read(1024)
frame_start = block.find(chr(255))
block_count = 0 #abort after 64k
while len(block)>0 and frame_start == -1 and block_count<64:
block = f.read(1024)
frame_start = block.find(chr(255))
block_count+=1
if frame_start > -1:
frame_hdr = block[frame_start:frame_start+4]
is_valid = frame_hdr[0] == chr(255)
mpeg_version = ''
layer_desc = ''
uses_crc = False
bitrate = 0
sample_rate = 0
padding = False
frame_length = 0
if is_valid:
is_valid = ord(frame_hdr[1]) & 0xe0 == 0xe0 #validate the rest of the frame_sync bits exist
if is_valid:
if ord(frame_hdr[1]) & 0x18 == 0:
mpeg_version = '2.5'
elif ord(frame_hdr[1]) & 0x18 == 0x10:
mpeg_version = '2'
elif ord(frame_hdr[1]) & 0x18 == 0x18:
mpeg_version = '1'
else:
is_valid = False
if is_valid:
if ord(frame_hdr[1]) & 6 == 2:
layer_desc = 'Layer III'
elif ord(frame_hdr[1]) & 6 == 4:
layer_desc = 'Layer II'
elif ord(frame_hdr[1]) & 6 == 6:
layer_desc = 'Layer I'
else:
is_valid = False
if is_valid:
uses_crc = ord(frame_hdr[1]) & 1 == 0
bitrate_chart = [
[0,0,0,0,0],
[32,32,32,32,8],
[64,48,40,48,16],
[96,56,48,56,24],
[128,64,56,64,32],
[160,80,64,80,40],
[192,96,80,96,40],
[224,112,96,112,56],
[256,128,112,128,64],
[288,160,128,144,80],
[320,192,160,160,96],
[352,224,192,176,112],
[384,256,224,192,128],
[416,320,256,224,144],
[448,384,320,256,160]]
bitrate_index = ord(frame_hdr[2]) >> 4
if bitrate_index==15:
is_valid=False
else:
bitrate_col = 0
if mpeg_version == '1':
if layer_desc == 'Layer I':
bitrate_col = 0
elif layer_desc == 'Layer II':
bitrate_col = 1
else:
bitrate_col = 2
else:
if layer_desc == 'Layer I':
bitrate_col = 3
else:
bitrate_col = 4
bitrate = bitrate_chart[bitrate_index][bitrate_col]
is_valid = bitrate > 0
if is_valid:
sample_rate_chart = [
[44100, 22050, 11025],
[48000, 24000, 12000],
[32000, 16000, 8000]]
sample_rate_index = (ord(frame_hdr[2]) & 0xc) >> 2
if sample_rate_index != 3:
sample_rate_col = 0
if mpeg_version == '1':
sample_rate_col = 0
elif mpeg_version == '2':
sample_rate_col = 1
else:
sample_rate_col = 2
sample_rate = sample_rate_chart[sample_rate_index][sample_rate_col]
else:
is_valid = False
if is_valid:
padding = ord(frame_hdr[2]) & 1 == 1
padding_length = 0
if layer_desc == 'Layer I':
if padding:
padding_length = 4
frame_length = (12 * bitrate * 1000 / sample_rate + padding_length) * 4
else:
if padding:
padding_length = 1
frame_length = 144 * bitrate * 1000 / sample_rate + padding_length
is_valid = frame_length > 0
# Verify the next frame
if(frame_start + frame_length < len(block)):
is_valid = block[frame_start + frame_length] == chr(255)
else:
offset = (frame_start + frame_length) - len(block)
block = f.read(1024)
if len(block) > offset:
is_valid = block[offset] == chr(255)
else:
is_valid = False
f.close()
return is_valid
print "Content-type: text/plain;charset=utf-8"
print
req = None
fs = cgi.FieldStorage()
try:
rk = fs.keys()[0]
if rk == FILEUPLOADKEY:
fileitem = fs[FILEUPLOADKEY]
bfn = os.path.basename(fileitem.filename)
longpath = MEDIAFILESHOMEDIR + "/" + bfn
if os.path.exists(longpath):
longpath = MEDIAFILESHOMEDIR + "/" + str(time.time()).split('.')[0] + "+" + bfn
if os.path.exists(longpath):
resp = '{"requested": "upload", "warning": "file already exists", "description": "file not uploaded", "responsen": 202, "response": "alreadyexists", "path": "%s"}' % longpath
else:
f = open(longpath, 'wb', 10000)
while True:
chunk = fileitem.file.read(10000)
if not chunk: break
f.write(chunk)
f.close()
if isMp3Valid(longpath):
resp = '{"requested": "upload", "warning": null, "description": "file uploaded", "responsen": 0, "response": "ok", "path": "%s"}' % longpath
else:
resp = '{"requested": "upload", "warning": "file is not a valid mp3", "description": "file uploaded", "responsen": 0, "response": "ok", "path": "%s"}' % longpath
else:
req = fs.getfirst(rk, "no request")
except:
raise
req = "no request"
if req:
jp = radiomate.jsonif.JSONProcessor()
resp = jp.process(req)
print resp