swannodette

(defn validates-credentials [username password]
  (let [uc (count username)
        pc (count password)]
    (match [username uc password pc]
       [(:or nil "") _ _ _]         {:error "No username given" :field "name"}
       [_ _ (:or nil "") _]         {:error "No password given" :field "pass"}
       [_ (_ :guard #(< % 3)) _ _]  {:error "Username less than 3 characters" :field "pass"}
       [_ _ _ (_ :guard #(< % 4))]  {:error "Password less than 4 characters" :field "pass"}
       [#"^([a-z0-9-_]+)$" _ _ _]   {:error "Username contains invalid characters" :field "name"}
       :else true)))

runfalk

# Assumes app = Flask(...)
import json
from flask.sessions import SecureCookieSession, SecureCookieSessionInterface

class JSONSecureCookieSession(SecureCookieSession):
	serialization_method = json

class JSONSecureCookieSessionInterface(SecureCookieSessionInterface):
	session_class = JSONSecureCookieSession