1 files changed, 106 insertions, 0 deletions
diff --git a/guard/application.py b/guard/application.py
new file mode 100644
index 0000000..4782bac
--- /dev/null
+++ b/guard/application.py
@@ -0,0 +1,106 @@
+from .model import Access
+from . import templates
+
+import logging
+from fnmatch import fnmatchcase
+from urllib.request import urlopen
+from urllib.parse import urlencode
+
+from pyinflux.parser import LineParser
+from flask import request, redirect, session, url_for, make_response, Response
+from werkzeug.exceptions import InternalServerError, Forbidden, Unauthorized, PreconditionFailed
+
+
+def make_app(app, config):
+    cookiename = config['cookiename']
+
+    @app.route("/", methods=["POST", "GET"])
+    def index():
+        if "valid" not in session:
+            return redirect(url_for("login"))
+
+        if request.method == "POST":
+            Access.create(token=request.form["token"],
+                          pattern=request.form["pattern"],
+                          comment=request.form["comment"])
+        return templates.index(config['port'], cookiename)
+
+    @app.route("/delete", methods=["POST"])
+    def delete():
+        if "valid" not in session:
+            return redirect(url_for("login"))
+        Access.delete().where(Access.id == int(request.form["id"])).execute()
+        return redirect(url_for("index"))
+
+    @app.route("/logout")
+    def logout():
+        del session["valid"]
+        return redirect(url_for("login"))
+
+    @app.route("/login", methods=["POST", "GET"])
+    def login():
+        if request.method == "POST":
+            if "secret" in request.form and \
+                            request.form["secret"] == config["adminsecret"]:
+                logging.info("Login successful")
+                session["valid"] = True
+                return redirect(url_for("index"))
+            else:
+                logging.info("Login failed")
+                return redirect(url_for("login"))
+        else:
+            return templates.login()
+
+    @app.route("/write/<token>", methods=["POST"])
+    @app.route("/write", methods=["POST"])
+    def write(token=None):
+        # Find token cookie in request
+        if not token:
+            token = request.cookies.get(cookiename)
+
+        valid_access_patterns = tuple(map(lambda x: x[0],
+                                        Access.select(Access.pattern).where(Access.token == token).tuples()))
+        if not valid_access_patterns:
+            return make_response("Token {} is not configured\n".format(token), Forbidden.code)
+
+        # Read request
+        database = request.args.get("db")
+        if not database:
+            return make_response("No database name given in parameter 'db'\n", PreconditionFailed.code)
+
+        # Read data
+        data = request.get_data(as_text=False)
+        data_text = data.decode(request.charset, request.encoding_errors)
+
+        # validate access
+        for line in data_text.split("\n"):
+            identifier = database + '.' + LineParser.parse_identifier(line)
+            if not any(map(lambda pattern: fnmatchcase(identifier, pattern), valid_access_patterns)):
+                logging.info("Reject write to %s", identifier)
+                return make_response("Invalid path: {}\n".format(identifier), Unauthorized.code)
+
+
+        # checks passed, forward the request
+        params = {'db': database}
+        if request.args.get("rp"):
+            params["rp"] = request.args.get("rp")
+        if request.args.get("precision"):
+            params["precision"] = request.args.get("precision")
+        if request.args.get("consistency"):
+            params["consistency"] = request.args.get("consistency")
+
+        if config.get("username"):
+            params["u"] = config["username"]
+        if config.get("password"):
+            params["p"] = config["password"]
+
+        url = config['url'] + "?" + urlencode(params)
+        try:
+            with urlopen(url, data) as resp:
+                if logging.root.isEnabledFor(logging.INFO):
+                    logging.info("Forwarded request to database '%s' for '%s' with '%s': %s",
+                                 database, request.remote_addr, token, data_text)
+                return Response(resp.fp, status=resp.getcode())
+        except:
+            logging.exception("Request failed for:\n%s", data)
+            return make_response("Failed", InternalServerError.code)