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application.py
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application.py
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"""Application page for this flask app"""
import os
import logging
from flask import Flask, session, jsonify, render_template, request, redirect, url_for, request
from flask_session import Session
from flask_cors import CORS, cross_origin
from sqlalchemy import create_engine, or_
from sqlalchemy.orm import scoped_session, sessionmaker
from sqlalchemy.ext.declarative import declarative_base
import models
from models import Base, User, Book
from search import *
from book_details import *
from query_user import *
from goodreads_api import get_bookreads_api
app = Flask(__name__)
cors = CORS(app, resources={r"/api/*": {"origins": "*"}})
# Check for environment variable
if not os.getenv("DATABASE_URL"):
raise RuntimeError("DATABASE_URL is not set")
# Check for environment variable of GOODREADS_KEY
if not os.getenv("GOODREADS_KEY"):
raise RuntimeError("GOODREADS_KEY is not set")
# Configure session to use filesystem
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)
# logging all the events in a file by suing logging module in python
logging.basicConfig(filename='logger.log',level=logging.DEBUG)
engine = create_engine(os.getenv("DATABASE_URL"))
db_session = scoped_session(sessionmaker(bind=engine))
Base.query = db_session.query_property()
logging.debug("database sessions created")
def init_db():
Base.metadata.create_all(bind=engine)
init_db()
#Home page
@app.route("/", methods=['GET', 'POST'])
def index():
"""Return to home if already logged in else to registration"""
if request.method == 'GET':
if session.get("email") is None:
return redirect(url_for('register', arg=4))
return render_template("home.html", value = None)
elif request.method == 'POST':
qtype = request.form['type']
query = request.form['query']
books = search_book_by_type(qtype, query)
if books.first() == None:
return render_template("home.html", value = None, message = None)
else:
return render_template("home.html", value = books)
#admin page
@app.route("/admin")
def admin():
"""Return all the users in database"""
users = get_allusers()
logging.debug("admin worked successfully")
return render_template("list.html", value=users)
#registration page
@app.route("/register", methods=['GET', 'POST'])
@app.route("/register/<int:arg>", methods=['GET', 'POST'])
def register(arg=None):
"""register a user in to database"""
if request.method == 'GET':
if arg == 1:
arg = 'Please enter valid email'
elif arg == 2:
arg = 'Email is not register. Please register'
elif arg == 3:
arg = 'wrong password'
elif arg == 4:
arg = 'please login'
return render_template("register.html", value=arg)
elif request.method == 'POST':
email = request.form['email']
pwd = request.form['psw']
if not("@" in email and "." in email):
logging.debug("enter valid email")
return render_template("register.html", value="Please enter valid email")
if get_user_by_email(email) is not None:
logging.debug("email id already exists")
return render_template("register.html", value="Email already registered please login")
new_user = User(email=email, pwd=pwd)
add_user(new_user)
logging.debug("user successfully registered in db")
return render_template("register.html", value="Sucessfully registered please login")
#authentication for login
@app.route("/auth", methods=['POST'])
def auth():
"""login authentication for a user"""
email = request.form['email']
pwd = request.form['psw']
if not("@" in email and "." in email):
return redirect(url_for('register', arg=1))
user = get_user_by_email(email)
if user is None:
return redirect(url_for('register', arg=2))
if user[0].email == email and user[0].pwd == pwd:
session["email"] = user[0].email
session["pwd"] = user[0].pwd
return redirect(url_for('index'))
return redirect(url_for('register', arg=3))
# Logout
@app.route("/logout")
def logout():
"""Logout a user"""
session.clear()
logging.debug("user logout")
return redirect(url_for("register"))
# To show a book details
@app.route("/books", methods=["GET"])
def book_details():
isbn = request.args.get('isbn')
book = get_book_by_isbn(isbn)
# book.isbn, book.name, book.author, book.year = db_session.execute("SELECT isbn, name, author, year FROM books WHERE isbn = :isbn", {"isbn": isbn}).fetchone()
if request.method == "GET":
return render_template("book_detail.html", book=book[0])
#sending as parameters as string, so we have used GET request
@app.route("/api/book/", methods=["GET"])
def api_get_book():
isbn = request.args.get('isbn')
book = get_book_by_isbn(isbn)
response_book = get_bookreads_api(isbn)
if request.method == "GET":
if book.count() != 1:
logging.debug("invalid isbn number")
return (jsonify({"Error": "Invalid book ISBN"}), 422)
else:
book = book[0]
logging.debug("successfull in database query")
return jsonify(title=book.name, author=book.author, year=book.year, isbn=book.isbn, avg_ratings=response_book["average_rating"], img=response_book["img"])
# sending data as JSON, so we have used POST request
@app.route("/api/search/", methods=["POST"])
@cross_origin()
def api_search_isbn():
if request.is_json:
content = request.get_json()
if 'type' in content and 'query' in content:
# type can be ISBN, Name, author, year
qtype = content['type'].strip()
if qtype in ["ISBN", "Name", "author","year"]:
query = content['query'].strip()
books = search_book_by_type(qtype, query)
if books is not None:
l = []
books_json = {}
for book in books:
d = {}
d["isbn"] = book.isbn
l.append(d)
books_json['books'] = l
return jsonify(books_json)
else:
logging.debug("invalid key value error")
return (jsonify({"Error": "Invalid key value"}), 400)
else:
logging.debug("invalid json data error")
return (jsonify({"Error": "Invalid JSON data"}), 400)
else:
logging.debug("invalid json type")
return (jsonify({"Error": "Invalid JSON type"}), 422)