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import re
from math import sqrt
from datetime import datetime
from aprslib import base91
from aprslib.exceptions import ParseError
from aprslib.parsing import logger
from aprslib.parsing.telemetry import parse_comment_telemetry
__all__ = [
'validate_callsign',
'parse_header',
'parse_timestamp',
'parse_comment',
'parse_data_extentions',
'parse_comment_altitude',
'parse_dao',
]
def validate_callsign(callsign, prefix=""):
prefix = '%s: ' % prefix if bool(prefix) else ''
match = re.findall(r"^([A-Z0-9]{1,6})(-(\d{1,2}))?$", callsign)
if not match:
raise ParseError("%sinvalid callsign" % prefix)
callsign, _, ssid = match[0]
if bool(ssid) and int(ssid) > 15:
raise ParseError("%sssid not in 0-15 range" % prefix)
def parse_header(head):
"""
Parses the header part of packet
Returns a dict
"""
try:
(fromcall, path) = head.split('>', 1)
except:
raise ParseError("invalid packet header")
if (not 1 <= len(fromcall) <= 9 or
not re.findall(r"^[a-z0-9]{0,9}(\-[a-z0-9]{1,8})?$", fromcall, re.I)):
raise ParseError("fromcallsign is invalid")
path = path.split(',')
if len(path[0]) == 0:
raise ParseError("no tocallsign in header")
tocall = path[0]
path = path[1:]
validate_callsign(tocall, "tocallsign")
for digi in path:
if not re.findall(r"^[A-Z0-9\-]{1,9}\*?$", digi, re.I):
raise ParseError("invalid callsign in path")
parsed = {
'from': fromcall,
'to': tocall,
'path': path,
}
viacall = ""
if len(path) >= 2 and re.match(r"^q..$", path[-2]):
viacall = path[-1]
parsed.update({'via': viacall})
return parsed
def parse_timestamp(body, packet_type=''):
parsed = {}
match = re.findall(r"^((\d{6})(.))$", body[0:7])
if match:
rawts, ts, form = match[0]
utc = datetime.utcnow()
timestamp = 0
if packet_type == '>' and form != 'z':
pass
else:
body = body[7:]
try:
# zulu hhmmss format
if form == 'h':
timestamp = "%d%02d%02d%s" % (utc.year, utc.month, utc.day, ts)
# zulu ddhhmm format
# '/' local ddhhmm format
elif form in 'z/':
timestamp = "%d%02d%s%02d" % (utc.year, utc.month, ts, 0)
else:
timestamp = "19700101000000"
td = utc.strptime(timestamp, "%Y%m%d%H%M%S") - datetime(1970, 1, 1)
timestamp = int((td.microseconds + (td.seconds + td.days * 24 * 3600) * 10**6) / 10**6)
except Exception as exp:
timestamp = 0
logger.debug(exp)
parsed.update({
'raw_timestamp': rawts,
'timestamp': int(timestamp),
})
return (body, parsed)
def parse_comment(body, parsed):
body, result = parse_data_extentions(body)
parsed.update(result)
body, result = parse_comment_altitude(body)
parsed.update(result)
body, result = parse_comment_telemetry(body)
parsed.update(result)
body = parse_dao(body, parsed)
if len(body) > 0 and body[0] == "/":
body = body[1:]
parsed.update({'comment': body.strip(' ')})
def parse_data_extentions(body):
parsed = {}
# course speed bearing nrq
# Page 27 of the spec
# format: 111/222/333/444text
match = re.findall(r"^([0-9 \.]{3})/([0-9 \.]{3})", body)
if match:
cse, spd = match[0]
body = body[7:]
if cse.isdigit() and cse != "000":
parsed.update({'course': int(cse) if 1 <= int(cse) <= 360 else 0})
if spd.isdigit() and spd != "000":
parsed.update({'speed': int(spd)*1.852})
# DF Report format
# Page 29 of teh spec
match = re.findall(r"^/([0-9 \.]{3})/([0-9 \.]{3})", body)
if match:
# cse=000 means stations is fixed, Page 29 of the spec
if cse == '000':
parsed.update({'course': 0})
brg, nrq = match[0]
body = body[8:]
if brg.isdigit():
parsed.update({'bearing': int(brg)})
if nrq.isdigit():
parsed.update({'nrq': int(nrq)})
else:
# PHG format: PHGabcd....
# RHGR format: RHGabcdr/....
match = re.findall(r"^(PHG(\d[\x30-\x7e]\d\d)([0-9A-Z]\/)?)", body)
if match:
ext, phg, phgr = match[0]
body = body[len(ext):]
parsed.update({
'phg': phg,
'phg_power': int(phg[0]) ** 2, # watts
'phg_height': (10 * (2 ** (ord(phg[1]) - 0x30))) * 0.3048, # in meters
'phg_gain': 10 ** (int(phg[2]) / 10.0), # dB
})
phg_dir = int(phg[3])
if phg_dir == 0:
phg_dir = 'omni'
elif phg_dir == 9:
phg_dir = 'invalid'
else:
phg_dir = 45 * phg_dir
parsed['phg_dir'] = phg_dir
# range in km
parsed['phg_range'] = sqrt(2 * (parsed['phg_height'] / 0.3048)
* sqrt((parsed['phg_power'] / 10.0)
* (parsed['phg_gain'] / 2.0)
)
) * 1.60934
if phgr:
# PHG rate per hour
parsed['phg'] += phgr[0]
parsed.update({'phg_rate': int(phgr[0], 16)}) # as decimal
else:
match = re.findall(r"^RNG(\d{4})", body)
if match:
rng = match[0]
body = body[7:]
parsed.update({'rng': int(rng) * 1.609344}) # miles to km
return body, parsed
def parse_comment_altitude(body):
parsed = {}
match = re.findall(r"^(.*?)/A=(\-\d{5}|\d{6})(.*)$", body)
if match:
body, altitude, rest = match[0]
body += rest
parsed.update({'altitude': int(altitude)*0.3048})
return body, parsed
def parse_dao(body, parsed):
match = re.findall("^(.*)\!([\x21-\x7b])([\x20-\x7b]{2})\!(.*?)$", body)
if match:
body, daobyte, dao, rest = match[0]
body += rest
parsed.update({'daodatumbyte': daobyte.upper()})
lat_offset = lon_offset = 0
if daobyte == 'W' and dao.isdigit():
lat_offset = int(dao[0]) * 0.001 / 60
lon_offset = int(dao[1]) * 0.001 / 60
elif daobyte == 'w' and ' ' not in dao:
lat_offset = (base91.to_decimal(dao[0]) / 91.0) * 0.01 / 60
lon_offset = (base91.to_decimal(dao[1]) / 91.0) * 0.01 / 60
parsed['latitude'] += lat_offset if parsed['latitude'] >= 0 else -lat_offset
parsed['longitude'] += lon_offset if parsed['longitude'] >= 0 else -lon_offset
return body
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