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Initial: plugin-server

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Ozbolt Menegatti 1 year ago
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#!/usr/bin/python3
"""
This serves lexonomy plugins
This almost just returns static files,
it only does search-and-replace for
$LOCATION$ -> location of plugin
every plugin is its own folder and if folder is
"myplugin" and this website's url is "http://example.com",
then $LOCATION$ gets the value of http://example.com/myplugin
"""
import sys
import os.path
import mimetypes
import hashlib
from base64 import b64encode
import redis
from flask import Flask, Response, request
app = Flask(__name__)
redis = redis.Redis(host='localhost', port=6379, db=0)
URL = "//plugins.lexonomy.cjvt.si"
REPLACE_STRING = "$LOCATION$"
@app.route("/")
def root():
result = "<html><body><h2>Description</h2><pre>"
result += sys.modules[__name__].__doc__
result += "</pre><h2>Url</h2><p>"
result += URL
result += "</p></body></html>"
return result
@app.route("/<plugin>")
def plugin_root(plugin):
status = "" if os.path.isdir(plugin) else " NOT"
return "Plugin {} was{} found".format(plugin, status)
def check_cache(full_path):
file_time = int(os.path.getmtime(full_path))
old_file_time = 0
status = False
if redis.exists(full_path + ":date"):
try:
old_file_time = int(redis.get(full_path + ":date"))
status = old_file_time == file_time
except ValueError:
pass
redis.set(full_path + ":date", file_time)
return status
@app.route("/<plugin>/<path:path>")
def plugin_file(plugin, path):
full_path = "{}/{}".format(plugin, path)
if not os.path.isfile(full_path):
return "File not found", 404
mt, _encoding = mimetypes.guess_type(path)
if check_cache(full_path):
result = redis.get(full_path + ":content")
status_code = 304
else:
replace_with = "{}/{}".format(URL, plugin)
status_code = 200
with open(full_path, 'rb') as fp:
content_bytes = fp.read()
try:
content = content_bytes.decode('UTF-8')
result = content.replace(REPLACE_STRING, replace_with)
result = result.encode('UTF-8')
except UnicodeDecodeError:
result = content_bytes
redis.set(full_path + ":content", result)
resp = Response(result, mimetype=mt)
resp.headers.add('Access-Control-Allow-Origin', '*')
resp.status_code = status_code
# return everything if cached response is not allowed
if 'Cache-Control' in request.headers:
if request.headers['Cache-Control'] in ('no-cache', 'max-age=0'):
resp.status_code = 200
return resp
if __name__ == '__main__':
app.run(host="0.0.0.0")

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