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Changed webserver is deprecated, Web UI served through NGINX

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allegroai
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Server Side Public License
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END OF TERMS AND CONDITIONS

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# Webserver (NGINX)
## Introduction
The webserver is the **trains-server**'s component responsible for serving the TRAINS webapp.
For this purpose, we use an [NGINX](https://www.nginx.com/) server.
## Configuration
In order to serve the TRAINS webapp, the following is required:
* The pre-built TRAINS webapp should be copied to the NGINX html directory (usually `/usr/share/nginx/html`)
* The default NGINX port (usually `80`) should be changed to match the **trains-server** configuration (usually `8080`)
NOTE: This configuration may vary in different systems, depending on the NGINX version and distribution used.
#### Example: Centos 7
The following commands can be used to install and run NGINX in the Centos 7 OS:
```bash
yum install nginx
cp -R /path/to/trains-webapp/build/* /var/www/html
systemctl enable nginx
systemctl start nginx
```

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api_server: "127.0.0.1:8008"

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webserver/config/default/logging.conf
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{
version: 1
disable_existing_loggers: false
formatters: {
standard: {
format: "[%(asctime)s] [%(process)d] [%(levelname)s] [%(name)s] %(message)s"
}
}
handlers {
console {
formatter: standard
class: "logging.StreamHandler"
}
text_file: {
formatter: standard,
backupCount: 3
maxBytes: 10240000,
class: "logging.handlers.RotatingFileHandler",
filename: "/var/log/trains/webserver.log"
}
}
root {
handlers: [console, text_file]
level: INFO
}
loggers {
urllib3 {
handlers: [console, text_file]
level: WARN
propagate: false
}
werkzeug {
handlers: [console, text_file]
level: WARN
propagate: false
}
}
}

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webserver/config/default/secure.conf
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{
http {
session_secret {
webserver: "n(Dtd6!w(QXW^mLmEKTjsWiOODd9gi@SHJMyt4UF*tiYN3Q@!T"
}
}
credentials {
# system credentials as they appear in the auth DB, used for intra-service communications
webserver {
user_key: "EYVQ385RW7Y2QQUH88CZ7DWIQ1WUHP"
user_secret: "yfc8KQo*GMXb*9p((qcYC7ByFIpF7I&4VH3BfUYXH%o9vX1ZUZQEEw1Inc)S"
}
}
}

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webserver/config/default/webserver.conf
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# requested token expiration in seconds (one month)
apiserver_token_expiration: 2592000
debug: false
flask {
# Uncomment next line to disable login requirement while testing (or unit-testing)
TESTING: False
# Uncomment to allow reloading of templates if the caches version differs from the latest version
TEMPLATES_AUTO_RELOAD: True
# Flask-Login session protection ('basic', 'strong' or null)
SESSION_PROTECTION: basic
SESSION_COOKIE_HTTPONLY: True
REMEMBER_COOKIE_HTTPONLY: True
SESSION_COOKIE_SECURE: False
REMEMBER_COOKIE_SECURE: False
}
listen {
ip : "0.0.0.0"
port: 8080
}
auth {
cookies {
httponly: true # allow only http to access the cookies (no JS etc)
secure: false # not using HTTPS
domain: null # Limit to localhost is not supported
}
session_auth_cookie_name: "trains_token_basic"
user_token_expiration_sec: 3600
}
docs {
# Default filename used when file not found error is reported when serving docs.
# This usually happens when the path is to a folder and not a file.
default_filename: "index.html"
}
default_company: "d1bd92a3b039400cbafc60a7a5b1e52b"
redirect_to_https: false

20
webserver/factory.py
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import functools
class Factory:
default_cls = None
registered_cls = None
@classmethod
@functools.lru_cache(maxsize=None)
def get(cls, *args, **kwargs):
return cls.get_class()(*args, **kwargs)
@classmethod
@functools.lru_cache(maxsize=None)
def get_class(cls):
return cls.registered_cls or cls.default_cls
@classmethod
def register(cls, registered_cls):
cls.registered_cls = registered_cls

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webserver/requirements.txt
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@@ -1,11 +0,0 @@
Jinja2>=2.9.6
requests>=2.0
Werkzeug==0.12.2
Flask==0.12.2
Flask-Caching==1.4.0
Flask-Login==0.4.1
Flask-Compress==1.4.0
PyJWT==1.3.0
attrs>=18
pyhocon>=0.3.35
furl>=2.0.0

6
webserver/session/__init__.py
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from factory import Factory
from .simple import SimpleSession
class SessionFactory(Factory):
default_cls = SimpleSession

21
webserver/session/simple.py
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import requests
from furl import furl
from requests.auth import HTTPBasicAuth
from config import config
class SimpleSession:
def __init__(self):
self.host = config["hosts.api_server"]
if not self.host.startswith("http"):
self.host = f"http://{self.host}"
self.key = config.get("secure.credentials.webserver.user_key")
self.secret = config.get("secure.credentials.webserver.user_secret")
self.auth = HTTPBasicAuth(self.key, self.secret)
def send_request(self, endpoint, json=None):
url = furl(self.host).set(path=endpoint)
return requests.get(str(url), json=json, auth=self.auth)

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webserver/static/styles/index.css
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body {
background-color: #202432;
}
.jumbotron {
background-color: #384161;
color: #c3cdf0;
font-family: Heebo;
margin-bottom: 15px !important;
}
.username-input {
margin-bottom: 20px;
padding: 0 20px;
}
.jumbotron .btn {
background-color: #5a658e;
color: #ffffff;
font-size: 13px;
font-weight: bold;
margin: auto;
padding: 10px 30px;
border:0px solid transparent; /* this was 1px earlier */
}
.jumbotron .btn:hover {
background-color: #c3cdf0;
color: #2c3246;
border:0px solid transparent; /* this was 1px earlier */
}
.login-buttons .btn {
text-align: left !important;
margin-bottom: 10px;
}
.login-buttons .btn i {
margin-right: 10px;
}
.mobile-warn {
font-size: 40px;
display: none;
}
.mobile-warn.show {
display: block;
}
.mobile-warn > strong {
margin-right: 5px;
}
.logo {
width: 60%;
margin-bottom: 30px;
}
.or-container {
position: relative;
margin-top: 50px;
background-color: #384161;
padding-bottom: 20px;
}
.or-container hr{
border-top: 1px solid rgba(255,255,255,0.3);
}
.or {
position: absolute;
left: 0;
right: 0;
top: -10px;
margin: auto;
width: 30px;
font-size: 15px;
font-weight: bold;
text-align: center;
color: #8693be;
background-color: inherit;
}
.github-link {
display: flex;
justify-content: center;
align-items: center;
color: #ffffff;
}
a {
color: #ffffff;
margin-left: 10px;
}
a:hover, a:active, a:focus {
color: #ffffff;
}
.fa.fa-2x {
font-size: 1.8em;
}
.fork-github {
opacity: 0.5;
}
/*# sourceMappingURL=index.css.map */

7
webserver/static/styles/index.css.map
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@@ -1,7 +0,0 @@
{
"version": 3,
"mappings": "AACE,gBAAE;EACA,UAAU,EAAE,eAAe;EAE3B,kBAAE;IACA,YAAY,EAAE,IAAI",
"sources": ["index.scss"],
"names": [],
"file": "index.css"
}

30
webserver/static/styles/index.scss
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@@ -1,30 +0,0 @@
body {
background-color: #202432;
}
.jumbotron {
background-color: #384161;
color: #c3cdf0;
font-family: Heebo;
}
.jumbotron .btn {
background-color: #2c3246;
color: #c3cdf0;
border:0px solid transparent; /* this was 1px earlier */
}
.jumbotron .btn:hover {
background-color: #c3cdf0;
color: #2c3246;
border:0px solid transparent; /* this was 1px earlier */
}
.login-buttons .btn {
text-align: left !important;
margin-bottom: 10px;
}
.login-buttons .btn i {
margin-right: 10px;
}

1
webserver/static/trains-wht-svg.svg
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73
webserver/templates/base.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Trains - Magic Version Control & Experiment Manager for AI</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Heebo" type="text/css" media="all"/>
<link rel="stylesheet" href="/static/styles/index.css">
<script charset="utf-8">
function acknowlage() {
var div = document.getElementById('mobile-warn');
div.className = div.className.slice(0, div.className.length - 5);
}
function mobilecheck() {
var check = false;
(function(a){if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4))) check = true;})(navigator.userAgent||navigator.vendor||window.opera);
return check;
};
document.addEventListener('DOMContentLoaded', function(){
var div = document.getElementById('mobile-warn');
if(mobilecheck()) {
div.className += ' show';
}
}, false);
</script>
{% block head %}
{% endblock %}
</head>
<body>
<div class="container text-center">
<br/><br/><br/>
<div id="mobile-warn" class="alert alert-warning mobile-warn" role="alert">
<button type="button" class="close" data-dismiss="alert" aria-label="Close" onclick="acknowlage()">
<span aria-hidden="true">&times;</span></button>
<strong>Notice!</strong> The Web-App is not yet optimized for mobile devices.
</div>
<div class="row">
{% set pwidth = popup_width or 4 %}
<div class="col col-md-{{ ((12 - pwidth) / 2)|int }}"></div>
<div class="col col-md-{{ pwidth }} jumbotron" style="border-radius: 0px; !important;">
<div class="row login-section">
<section class="mx-auto">
<img src="/static/trains-wht-svg.svg" alt="TRAINS" class="logo"/>
<br class="my-4 nav-divider"/>
{% block popup %}
{% endblock %}
</section>
</div>
</div>
</div>
<a class="fork-github" href="https://github.com/allegroai/trains/issues">Questions or comments?</a>
{% if get_flashed_messages() %}
<div class="row">
<div class="col col-md-2"></div>
<div class="col col-md-8">
{% block messages %}
{% endblock %}
</div>
<div class="col col-md-2"></div>
{% endif %}
</div>
</div>
</body>
</html>

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webserver/templates/login.html
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{% extends "base.html" %}
{% block head %}
{% endblock %}
{% block popup %}
<form role="form" class='form-horizontal' name="login_form" action="/create_user" method="post">
<div class="username-input">
<input id="username-input" name="name" type="text" class="form-control" value="" placeholder="Full name" required/>
</div>
<div >
<button class="btn btn-primary" type="submit">LOGIN<span class="new-user-login"> AS NEW USER</span></button>
</div>
</form>
<div class="btn-group-vertical btn-group-lg login-buttons" style="width: 100%">
{% for user in users %}
<a class="btn btn-default provider" style="border-radius: 0px; !important;" href="{{ url_for('login_by_id', user_id=user.id, **request.args) }}">
Login as <b>{{ user.name|capitalize }}</b>
</a>
{% endfor %}
</div>
<div class="or-container">
<hr/>
<div class="or"> OR </div>
</div>
<div class="github-link">
<i class="fa fa-2x fa-github" aria-hidden="true"></i>
<a href="https://github.com/allegroai/trains">Fork on Github</a>
</div>
{% endblock %}
{% block messages %}
<hr class="my-4 nav-divider"/>
{% for message in get_flashed_messages() %}
<div class="alert alert-danger text-left" role="alert">
<span class="glyphicon glyphicon-exclamation-sign" aria-hidden="true"></span>
<span class="sr-only">Error:</span>
{{ message }}
</div>
{% endfor %}
{% endblock %}

7
webserver/user/__init__.py
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from factory import Factory
from .simple import SimpleUser, CreateUserError, AUTH_TOKEN_COOKIE_KEY
class UserFactory(Factory):
default_cls = SimpleUser

133
webserver/user/simple.py
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@@ -1,133 +0,0 @@
import functools
import re
from uuid import uuid4
import attr
from flask import request
from flask_login import UserMixin
from config import config
from session import SessionFactory
log = config.logger(__file__)
AUTH_TOKEN_COOKIE_KEY = config["webserver.auth.session_auth_cookie_name"]
@attr.s(auto_attribs=True)
class UserData:
id: str = None
company: str = None
name: str = None
family_name: str = None
given_name: str = None
@classmethod
def from_dict(cls, d):
return cls(**{k: v for k, v in d.items() if k in attr.fields_dict(cls)})
class CreateUserError(Exception):
pass
class UsersGetAllError(Exception):
def __init__(self, res, *args):
self.res = res
super(UsersGetAllError, self).__init__(res, *args)
class SimpleUser(UserMixin):
_cache = None
@property
def user_data(self) -> UserData:
return self._user_data
@property
def token(self):
return self._get_token()
def __init__(self, user_data: UserData):
super(SimpleUser, self).__init__()
self._user_data = user_data
def get_id(self):
return self._user_data.id
@classmethod
def get(cls, user_id):
res = SessionFactory.get().send_request(
"users.get_by_id", json={"user": user_id}
)
if not res.ok:
return None
return cls(user_data=UserData.from_dict(res.json()["data"]["user"]))
@classmethod
def get_all(cls):
res = SessionFactory.get().send_request("users.get_all")
if not res.ok:
raise UsersGetAllError(res)
return [
cls(user_data=UserData.from_dict(user))
for user in res.json()["data"]["users"]
]
@classmethod
def create_by_name(cls, name: str):
name = re.sub(r"\s+", " ", name.strip())
existing_user = next(
(user for user in cls.get_all() if user.user_data.name.lower() == name.lower()),
None,
)
if existing_user:
return existing_user
company_id = config.get("webserver.default_company")
unique_email = f"{str(uuid4()).replace('-', '')}@example.com"
given_name, _, family_name = name.partition(" ")
res = SessionFactory.get().send_request(
"auth.create_user",
json={
"email": unique_email,
"name": name,
"company": company_id,
"given_name": given_name,
"family_name": family_name,
},
)
if not res.ok:
resp = res.json()
log.error(f"Failed creating user {name} ({resp['meta']})")
raise CreateUserError(
f"Failed creating user: {res.json().get(resp['meta']['result_msg'])}"
)
return cls.get(res.json()["data"]["id"])
@property
def is_authenticated(self) -> bool:
if AUTH_TOKEN_COOKIE_KEY not in request.cookies:
return False
token = request.cookies[AUTH_TOKEN_COOKIE_KEY]
# Assume we're authenticated if we have a token
return bool(token)
@functools.lru_cache(maxsize=None)
def _get_token(self):
res = SessionFactory.get().send_request(
"auth.get_token_for_user",
json={"user": self._user_data.id, "company": self._user_data.company},
)
if not res.ok:
log.error(
f"Failed generating token for user {self._user_data.id} ({res.json()['meta']})"
)
raise ValueError(f"Failed generating token for user {self._user_data.id}")
return res.json()["data"]["token"]

261
webserver/webserver.py
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@@ -1,261 +0,0 @@
import json
from argparse import ArgumentParser
from operator import attrgetter
from os.path import join
from flask import (
Flask,
render_template,
request,
redirect,
url_for,
send_from_directory,
flash,
make_response,
send_file,
session,
)
from flask_compress import Compress
from flask_login import (
LoginManager,
login_required,
logout_user,
login_user,
current_user,
)
from config import config
from user import (
UserFactory,
AUTH_TOKEN_COOKIE_KEY,
CreateUserError,
)
from user.simple import UsersGetAllError
log = config.logger(__file__)
log.info("################ Web Server initializing #####################")
app = Flask(__name__)
app.config.from_mapping(config.get("webserver.flask"))
app.config.update(
SECRET_KEY=config["secure.http.session_secret.webserver"],
COMPRESS_MIMETYPES=[
"text/html",
"text/css",
"text/xml",
"application/json",
"application/javascript",
"text/javascript",
],
COMPRESS_LEVEL=9,
)
login_manager = LoginManager(app)
login_manager.login_view = "login"
Compress(app)
def _secure_url_for(endpoint, external=True, **values):
if not config.get("webserver.redirect_to_https", False):
return url_for(endpoint, _external=external, **values)
return url_for(endpoint, _external=external, _scheme="https", **values)
@login_manager.user_loader
def load_user(id):
return UserFactory.get_class().get(id)
@login_manager.unauthorized_handler
def handle_needs_login():
session.pop("_flashes", None)
flash("You have to be logged in to access this page.")
return redirect(
_secure_url_for(".login", next=request.endpoint, **request.view_args)
)
@app.route("/create_user", methods=["GET", "POST"])
def create_user():
data = request.args or request.form
name = data["name"].strip()
try:
user = UserFactory.get_class().create_by_name(name)
except CreateUserError as e:
session.pop("_flashes", None)
message = e.args[0]
if "value combination" in message.lower():
message = f"Failed creating user {name}"
flash(message)
return redirect(_secure_url_for(".login"))
return _complete_user_login(user)
@app.route("/login/<user_id>")
def login_by_id(user_id):
if current_user.get_id() == user_id and current_user.is_authenticated:
return redirect(_secure_url_for(".login"))
try:
user = load_user(user_id)
except Exception as e:
# Some callback issue, try again.
# For example, the user tried to reload the callback page and the provider token was already redeemed.
session.pop("_flashes", None)
if e.args:
flash(e.args[0])
else:
flash(repr(e))
return redirect(_secure_url_for(".login"))
args = dict(request.args)
endpoint = args.pop("next", ".index")
return _complete_user_login(user, endpoint, **request.args)
def _complete_user_login(user, endpoint=".index", **kwargs):
login_user(user, True)
response = redirect(_secure_url_for(endpoint, **kwargs))
set_response_cookie(response, user)
return response
def set_response_cookie(response, user, copy_request=None):
if copy_request and AUTH_TOKEN_COOKIE_KEY in copy_request.cookies:
token = request.cookies[AUTH_TOKEN_COOKIE_KEY]
else:
token = user.token
response.set_cookie(
AUTH_TOKEN_COOKIE_KEY,
token,
**config.get("webserver.auth.cookies"),
)
@app.route("/logout")
def logout():
logout_user()
return redirect(_secure_url_for(".login"))
@app.route("/static/network/")
@login_required
def send_netron():
return send_from_directory("static", join("network", "index.html"))
@app.route("/static/<path:path>")
@login_required
def send_static(path):
return send_from_directory("static", path)
@app.route("/webapp_conf.js")
def webapp_conf():
webapp_conf = _get_webapp_conf()
response = make_response(f"SM_CONFIG={json.dumps(webapp_conf)}")
response.content_type = "text/javascript"
return response
def _get_webapp_conf():
webapp_conf = config.get("webapp")
webapp_build = None
webapp_path = "pages/webapp"
try:
with open(f"{webapp_path}/assets/build.json") as data_file:
webapp_build = json.load(data_file)
webapp_build["branch"] = webapp_build["branch"].replace("@", "")
except Exception:
webapp_build = {}
backend_path = "."
try:
with open(f"{backend_path}/static/build.json") as data_file:
backend_build = json.load(data_file)
except Exception:
backend_build = {}
webapp_conf.put("backend_build", backend_build)
webapp_conf.put("webapp_build", webapp_build)
webapp_conf.put("env", config.env)
return webapp_conf
@app.route("/login")
def login():
try:
users = sorted((user.user_data for user in UserFactory.get_class().get_all()), key=attrgetter("name"))
except UsersGetAllError as ex:
log.warning("error when getting users: %r", ex)
try:
result_msg = ex.res.json()["meta"]["result_msg"]
except Exception as ex:
log.exception("error when getting users: error when parsing error data")
flash(f"Unknown error: {ex!r} (check logs for more info)")
else:
flash(result_msg)
return make_response(render_template("login.html", users=[]))
response = make_response(render_template("login.html", users=users))
# make sure to clear out session token cookie
response.set_cookie(
AUTH_TOKEN_COOKIE_KEY, "", expires=0, **config.get("webserver.auth.cookies")
)
return response
def _serve_webapp(path=None):
if not path:
response = make_response(send_file("pages/webapp/index.html"))
else:
try:
response = make_response(send_from_directory("pages/webapp", path))
except Exception:
response = make_response(send_file("pages/webapp/index.html"))
set_response_cookie(response, current_user, request)
response.headers["X-Trains-Environment"] = "oss"
return response
@app.route("/favicon.ico")
def favicon():
return send_from_directory("static", "favicon.ico")
@app.route("/")
def index():
if not current_user.is_authenticated:
return redirect(_secure_url_for(".login"))
return _serve_webapp()
@app.route("/<path:path>")
@login_required
def webapp(path=None):
return _serve_webapp(path)
def parse_args():
parser = ArgumentParser(description=__doc__)
parser.add_argument(
"--port", "-p", type=int, default=config.get("webserver.listen.port")
)
parser.add_argument("--ip", "-i", type=str, default=config.get("webserver.listen.ip"))
parser.add_argument(
"--debug", action="store_true", default=config.get("webserver.debug")
)
return parser.parse_args()
def main():
args = parse_args()
app.run(debug=args.debug, host=args.ip, port=args.port, threaded=True)
if __name__ == "__main__":
main()