def test_iter(self):
def generator():
yield b"1" * 8192
yield b"2" * 4096
yield b"3" * 2048
fd = StreamIOIterWrapper(generator())
self.assertEqual(fd.read(4096), b"1" * 4096)
self.assertEqual(fd.read(2048), b"1" * 2048)
self.assertEqual(fd.read(2048), b"1" * 2048)
self.assertEqual(fd.read(1), b"2")
self.assertEqual(fd.read(4095), b"2" * 4095)
self.assertEqual(fd.read(1536), b"3" * 1536)
self.assertEqual(fd.read(), b"3" * 512)
class AkamaiHDStreamIO(io.IOBase):
Version = "2.5.8"
FlashVersion = "LNX 11,1,102,63"
StreamURLFormat = "{host}/{streamname}"
ControlURLFormat = "{host}/control/{streamname}"
ControlData = b":)"
TokenGenerators = {"c11e59dea648d56e864fc07a19f717b9": Auth3TokenGenerator}
StatusComplete = 3
StatusError = 4
Errors = {
1: "Stream not found",
2: "Track not found",
3: "Seek out of bounds",
4: "Authentication failed",
5: "DVR disabled",
6: "Invalid bitrate test"
}
def __init__(self, session, url, swf=None, seek=None):
parsed = urlparse(url)
self.session = session
self.host = ("{scheme}://{netloc}").format(scheme=parsed.scheme,
netloc=parsed.netloc)
self.streamname = parsed.path[1:]
self.swf = swf
self.seek = seek
def open(self):
self.guid = cache_bust_string(12)
self.islive = None
self.sessionid = None
self.flv = None
self.buffer = Buffer()
self.completed_handshake = False
url = self.StreamURLFormat.format(host=self.host,
streamname=self.streamname)
params = self._create_params(seek=self.seek)
log.debug(f"Opening host={self.host} streamname={self.streamname}")
try:
res = self.session.http.get(url, stream=True, params=params)
self.fd = StreamIOIterWrapper(res.iter_content(8192))
except Exception as err:
raise StreamError(str(err))
self.handshake(self.fd)
return self
def handshake(self, fd):
try:
self.flv = FLV(fd)
except FLVError as err:
raise StreamError(str(err))
self.buffer.write(self.flv.header.serialize())
log.debug("Attempting to handshake")
for i, tag in enumerate(self.flv):
if i == 10:
raise StreamError(
"No OnEdge metadata in FLV after 10 tags, probably not a AkamaiHD stream"
)
self.process_tag(tag, exception=StreamError)
if self.completed_handshake:
log.debug("Handshake successful")
break
def process_tag(self, tag, exception=IOError):
if isinstance(tag.data, ScriptData) and tag.data.name == "onEdge":
self._on_edge(tag.data.value, exception=exception)
self.buffer.write(tag.serialize())
def send_token(self, token):
headers = {"x-Akamai-Streaming-SessionToken": token}
log.debug("Sending new session token")
self.send_control("sendingNewToken", headers=headers, swf=self.swf)
def send_control(self, cmd, headers=None, **params):
if not headers:
headers = {}
url = self.ControlURLFormat.format(host=self.host,
streamname=self.streamname)
headers["x-Akamai-Streaming-SessionID"] = self.sessionid
params = self._create_params(cmd=cmd, **params)
return self.session.http.post(url,
headers=headers,
params=params,
data=self.ControlData,
exception=StreamError)
def read(self, size=-1):
if not (self.flv and self.fd):
return b""
if self.buffer.length:
return self.buffer.read(size)
else:
return self.fd.read(size)
def _create_params(self, **extra):
params = dict(v=self.Version,
fp=self.FlashVersion,
r=cache_bust_string(5),
g=self.guid)
params.update(extra)
return params
def _generate_session_token(self, data64):
swfdata = base64.decodestring(bytes(data64, "ascii"))
md5 = hashlib.md5()
md5.update(swfdata)
hash = md5.hexdigest()
if hash in self.TokenGenerators:
generator = self.TokenGenerators[hash](self)
return generator.generate()
else:
raise StreamError(
("No token generator available for hash '{0}'").format(hash))
def _on_edge(self, data, exception=IOError):
def updateattr(attr, key):
if key in data:
setattr(self, attr, data[key])
log.debug("onEdge data")
for key, val in data.items():
if isinstance(val, str):
val = val[:50]
log.debug(f" {key}={val}")
updateattr("islive", "isLive")
updateattr("sessionid", "session")
updateattr("status", "status")
updateattr("streamname", "streamName")
if self.status == self.StatusComplete:
self.flv = None
elif self.status == self.StatusError:
errornum = data["errorNumber"]
if errornum in self.Errors:
msg = self.Errors[errornum]
else:
msg = "Unknown error"
raise exception("onEdge error: " + msg)
if not self.completed_handshake:
if "data64" in data:
sessiontoken = self._generate_session_token(data["data64"])
else:
sessiontoken = None
self.send_token(sessiontoken)
self.completed_handshake = True