Support CORS policy for create a JSON API, Use library for JWT, and adding custom error page

config/server.py

@@ -1,7 +1,14 @@
+def erpadir(err):
+    return f'static/error/{err}.html'
+
 update = {
-    'server.socket_host'        : "hostname"    ,
-    'server.socket_port'        : "port"        ,
-    'tools.sessions.on'         : True          ,
-    'engine.autoreload.on'      : False         ,
-    'request.show_tracebacks'   : False         ,
+    'server.socket_host'                : "hostname"    ,
+    'server.socket_port'                : "port"        ,
+    'cors.expose.on'                    : True          ,
+    'tools.sessions.on'                 : True          ,
+    'engine.autoreload.on'              : False         ,
+    'request.show_tracebacks'           : False         ,
+    'error_page.403'                    : erpadir(403)  ,
+    'error_page.404'                    : erpadir(404)  ,
+    'error_page.500'                    : erpadir(500)  ,
 }

costa.py

@@ -1,5 +1,6 @@
 import sys
 import cherrypy
+import cherrypy_cors
 import handler
 
 from config import server
@@ -15,6 +16,7 @@ if __name__ == '__main__':
         update["server.socket_host"]    = sys.argv[1]
         update["server.socket_port"]    = int(sys.argv[2])
 
+        cherrypy_cors.install()
         cherrypy.config.update  ( update                                )
         cherrypy.quickstart     ( handler.handler(), config = dirconfig )
 

handler.py

@@ -1,4 +1,5 @@
 import cherrypy
+import cherrypy_cors
 import json
 
 import core.authentication      as authentication
@@ -8,6 +9,7 @@ import config.template          as pages
 
 import modules.user.home        as user_home
 
+@cherrypy.tools.accept(media="application/json")
 class handler(pages.main):
 
     def __init__(self):

install.sh

@@ -1,6 +1,8 @@
 sudo apt-get install -y python3-pip
 pip3 install --upgrade pip
 pip3 install cherrypy
+pip3 install cherrypy-cors
 pip3 install mako
 pip3 install mysql-connector
 pip3 install bcrypt
+pip3 install pyjwt[crypto]

static/error/403.html

@@ -0,0 +1 @@
+403 Forbidden

static/error/404.html

@@ -0,0 +1 @@
+404 Not found

static/error/500.html

@@ -0,0 +1 @@
+500 Internal server error