openwebrx-clone/owrx/controllers/assets.py

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from . import Controller
from owrx.config import Config
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from datetime import datetime, timezone
import mimetypes
import os
import pkg_resources
from abc import ABCMeta, abstractmethod
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import gzip
import logging
logger = logging.getLogger(__name__)
class GzipMixin(object):
def send_response(self, content, headers=None, content_type="text/html", *args, **kwargs):
if self.zipable(content_type) and "accept-encoding" in self.request.headers:
accepted = [s.strip().lower() for s in self.request.headers['accept-encoding'].split(",")]
if "gzip" in accepted:
if type(content) == str:
content = content.encode()
content = self.gzip(content)
if headers is None:
headers = {}
headers["Content-Encoding"] = "gzip"
super().send_response(content, headers=headers, content_type=content_type, *args, **kwargs)
def zipable(self, content_type):
types = [
"application/javascript",
"text/css",
"text/html"
]
return content_type in types
def gzip(self, content):
return gzip.compress(content)
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class ModificationAwareController(Controller, metaclass=ABCMeta):
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@abstractmethod
def getModified(self, file):
pass
def wasModified(self, file):
try:
modified = self.getModified(file).replace(microsecond=0)
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if modified is not None and "If-Modified-Since" in self.handler.headers:
client_modified = datetime.strptime(
self.handler.headers["If-Modified-Since"], "%a, %d %b %Y %H:%M:%S %Z"
).replace(tzinfo=timezone.utc)
if modified <= client_modified:
return False
except FileNotFoundError:
pass
return True
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class AssetsController(GzipMixin, ModificationAwareController, metaclass=ABCMeta):
def getModified(self, file):
return datetime.fromtimestamp(os.path.getmtime(self.getFilePath(file)), timezone.utc)
def openFile(self, file):
return open(self.getFilePath(file), "rb")
@abstractmethod
def getFilePath(self, file):
pass
def serve_file(self, file, content_type=None):
try:
modified = self.getModified(file)
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if not self.wasModified(file):
self.send_response("", code=304)
return
f = self.openFile(file)
data = f.read()
f.close()
if content_type is None:
(content_type, encoding) = mimetypes.MimeTypes().guess_type(file)
self.send_response(data, content_type=content_type, last_modified=modified, max_age=3600)
except FileNotFoundError:
self.send_response("file not found", code=404)
def indexAction(self):
filename = self.request.matches.group(1)
self.serve_file(filename)
class OwrxAssetsController(AssetsController):
def getFilePath(self, file):
return pkg_resources.resource_filename("htdocs", file)
class AprsSymbolsController(AssetsController):
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def __init__(self, handler, request, options):
pm = Config.get()
path = pm["aprs_symbols_path"]
if not path.endswith("/"):
path += "/"
self.path = path
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super().__init__(handler, request, options)
def getFilePath(self, file):
return self.path + file
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class CompiledAssetsController(GzipMixin, ModificationAwareController):
profiles = {
"receiver.js": [
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"lib/chroma.min.js",
"openwebrx.js",
"lib/jquery-3.2.1.min.js",
"lib/jquery.nanoscroller.js",
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"lib/Header.js",
"lib/Demodulator.js",
"lib/DemodulatorPanel.js",
"lib/BookmarkBar.js",
"lib/BookmarkDialog.js",
"lib/AudioEngine.js",
"lib/ProgressBar.js",
"lib/Measurement.js",
"lib/FrequencyDisplay.js",
"lib/Js8Threads.js",
"lib/Modes.js",
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],
"map.js": [
"lib/jquery-3.2.1.min.js",
"lib/chroma.min.js",
"lib/Header.js",
"map.js",
],
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"settings.js": [
"lib/jquery-3.2.1.min.js",
"lib/Header.js",
"lib/settings/Input.js",
"lib/settings/SdrDevice.js",
"settings.js",
]
}
def indexAction(self):
profileName = self.request.matches.group(1)
if profileName not in CompiledAssetsController.profiles:
self.send_response("profile not found", code=404)
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return
files = CompiledAssetsController.profiles[profileName]
files = [pkg_resources.resource_filename("htdocs", f) for f in files]
modified = self.getModified(files)
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if not self.wasModified(files):
self.send_response("", code=304)
return
contents = [self.getContents(f) for f in files]
(content_type, encoding) = mimetypes.MimeTypes().guess_type(profileName)
self.send_response("\n".join(contents), content_type=content_type, last_modified=modified, max_age=3600)
def getContents(self, file):
with open(file) as f:
return f.read()
def getModified(self, files):
modified = [os.path.getmtime(f) for f in files]
return datetime.fromtimestamp(max(*modified), timezone.utc)