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import os, sys
from os import path
from fnmatch import fnmatchcase
from pathlib import Path, PosixPath
from urllib.parse import urlparse, urlunparse
from stat import S_ISDIR
from xdg.BaseDirectory import xdg_config_home
import logging
import yaml
def load_config(path=None, groupnames=None):
if path is None:
for p in [Path(),
Path(xdg_config_home).joinpath('webmap'),
PosixPath('/etc').joinpath('webmap')]:
p = p.joinpath('config.yml')
if p.exists():
path = str(p)
break
with open(path, 'r') as fp:
config = yaml.safe_load(fp)
layers = config.get('layers', {})
# validate sources
destinations = {}
for name, layer in layers.items():
if isinstance(layer, dict):
layers[name] = layer = [layer]
for sourcedef in layer:
source = sourcedef.get('source', None)
if source is None:
continue
download = source.get('download', None)
if download is None:
url = None
dl_module = None
elif isinstance(download, str):
url = download
dl_module = None
source['download'] = download = { 'url': url }
else:
url = download.get('url', None)
dl_module = download.get('module', None)
if url is None:
urlp = None
else:
urlp = urlparse(url)
if urlp is None:
raise Exception(f'urlparse({url}) failed')
cache = source.get('cache', None)
if cache is None or isinstance(cache, str):
source['cache'] = { 'path': cache }
else:
cache = cache.get('path', None)
if cache is None or cache in ['', os.curdir, os.pardir] or cache.endswith(os.sep):
# infer filename from the source URL
if urlp is None or urlp.path is None or urlp.path == '' or urlp.path.endswith('/'):
raise Exception(f'Layer "{name}": Could not infer filename from URL {url}')
p = PosixPath(urlp.path)
if p is None or p.name is None or p.name == '':
raise Exception(f'Invalid PosixPath({urlp.path})')
if cache is None or cache == '':
cache = Path()
else:
cache = Path(cache)
cache = cache.joinpath(p.name)
else:
cache = Path(cache)
source['cache']['path'] = cache
v = { 'url': urlp, 'module': dl_module }
if cache in destinations and destinations[cache] != v:
# allow destination conflicts, but only when the source URL and module match
raise Exception(f'Destination conflict for layer "{name}"')
destinations[cache] = v
# filter layers that are not of interest
if groupnames is not None:
layernames = []
layer_groups = config.get('layer-groups', {})
for groupname in groupnames:
if groupname not in layer_groups:
if groupname in layers:
# fallback to layer names
layernames.append(groupname)
else:
logging.error('Unknown group/layer name "%s"', groupname)
exit(1)
else:
patterns = layer_groups[groupname]
if isinstance(patterns, str):
patterns = [patterns]
for pat in patterns:
has_match = False
for layername in layers:
if fnmatchcase(layername, pat):
if layername in layernames:
logging.debug('Layer "%s" was already added, skipping', layername)
else:
layernames.append(layername)
has_match = True
if has_match:
pass
elif pat in layers:
# fallback to exact match
if pat in layernames:
logging.debug('Layer "%s" was already added, skipping', pat)
else:
layernames.append(pat)
else:
logging.warning('Group name "%s" does not match anything', groupname)
layers = { name: layers[name] for name in layernames }
config['layers'] = layers
sys.modules[__name__].config = config
######
# The function definitions below are taken from cpython's source code
# and augmented with dir_fd.
# Is a path a directory?
# (From genericpath.py.)
def isdir(path, dir_fd=None, follow_symlinks=True):
try:
st = os.stat(path, dir_fd=dir_fd, follow_symlinks=follow_symlinks)
except (OSError, ValueError):
return False
return S_ISDIR(st.st_mode)
# Does a path exist?
# (From genericpath.py.)
def exists(path, dir_fd=None, follow_symlinks=True):
try:
os.stat(path, dir_fd=dir_fd, follow_symlinks=follow_symlinks)
except (OSError, ValueError):
return False
return True
# Create a leaf directory and all intermediate ones.
# (From os.py.)
def makedirs(name, mode=0o777, exist_ok=False, dir_fd=None, logging=None):
head, tail = path.split(name)
if not tail:
head, tail = path.split(head)
if head and tail and not exists(head, dir_fd=dir_fd):
try:
makedirs(head, exist_ok=exist_ok, dir_fd=dir_fd, logging=logging)
except FileExistsError:
# Defeats race condition when another thread created the path
pass
cdir = os.curdir
if isinstance(tail, bytes):
cdir = bytes(os.curdir, 'ASCII')
if tail == cdir: # xxx/newdir/. exists if xxx/newdir exists
return
if logging is not None:
logging.debug('mkdir("%s", 0%o)', name, mode)
try:
os.mkdir(name, mode, dir_fd=dir_fd)
except OSError:
# Cannot rely on checking for EEXIST, since the operating system
# could give priority to other errors like EACCES or EROFS
if not exist_ok or not isdir(name, dir_fd=dir_fd):
raise
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