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application.py
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/
application.py
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import os
import json
import requests
from flask import Flask, session, render_template, request, redirect, url_for
from flask import jsonify, make_response
from flask_session import Session
from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
from werkzeug.security import generate_password_hash, check_password_hash
app = Flask(__name__)
# Check for environment variable
if not os.getenv("DATABASE_URL"):
raise RuntimeError("DATABASE_URL is not set")
if not os.getenv("SECRET_KEY"):
raise RuntimeError("SECRET_KEY is not set")
if not os.getenv("GOODREADS_KEY"):
raise RuntimeError("GOODREADS_KEY is not set")
goodreads_key = os.getenv("GOODREADS_KEY")
# Configure session to use filesystem
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)
# Set up database
engine = create_engine(os.getenv("DATABASE_URL"))
db = scoped_session(sessionmaker(bind=engine))
@app.route("/")
def index():
return render_template("index.html.j2", session=session)
@app.route("/signup", methods=["GET", "POST"])
def signup():
if request.method != "POST":
return render_template("signup.html.j2")
username = request.form["username"]
password = generate_password_hash(request.form["password"])
displayname = request.form["displayname"]
email = request.form["email"]
user_lookup = db.execute(
"select username from users where username=:username", {"username": username}
).fetchone()
if user_lookup is not None:
error_message = "Username is already taken"
return render_template("signup.html.j2", error_message=error_message)
db.execute(
"insert into users (username, displayname, email, password) values (:username, :displayname, :email, :password)",
{
"username": username,
"displayname": displayname,
"email": email,
"password": password,
},
)
db.commit()
session["username"] = user_lookup["username"]
session["displayname"] = user_lookup["displayname"]
session["user_id"] = user_lookup["id"]
session["email"] = user_lookup["email"]
return redirect(url_for("user", username=username))
@app.route("/login", methods=["GET", "POST"])
def login():
if request.method == "POST":
username = request.form["username"]
password = request.form["password"]
user_lookup = db.execute(
"select trim(username) as username, trim(displayname) as displayname, password, email, id from users where username=:username",
{"username": username},
).fetchone()
if user_lookup is None: # if book isn't found
error_message = "User not found or password invalid"
return render_template("login.html.j2", error_message=error_message)
if check_password_hash(user_lookup["password"], password):
session["username"] = user_lookup["username"]
session["displayname"] = user_lookup["displayname"]
session["user_id"] = user_lookup["id"]
session["email"] = user_lookup["email"]
else:
error_message = "User not found or password invalid"
return render_template("login.html.j2", error_message=error_message)
return redirect(url_for("index"))
error_message = None
return render_template("login.html.j2", error_message=error_message)
@app.route("/logout")
def logout():
# remove the username from the session if it is there
session.pop("username", None)
session.pop("displayname", None)
session.pop("user_id", None)
session.pop("email", None)
return render_template("logout.html.j2")
@app.route("/user/<string:username>")
def user(username):
userdata = {}
user_lookup = db.execute(
"select trim(username) as username, trim(displayname) as displayname,\
email from users where username=:username",
{"username": username},
).fetchone()
if user_lookup is None:
userdata["message"] = "User not found"
else:
userdata["username"] = user_lookup["username"]
userdata["displayname"] = user_lookup["displayname"]
userdata["email"] = user_lookup["email"]
if "username" in session and userdata["username"] == session["username"]:
userdata["self"] = True
else:
userdata["self"] = False
return render_template("users.html.j2", userdata=userdata)
@app.route("/search", methods=["GET", "POST"])
def search():
if "username" not in session:
return redirect(url_for("login"))
query_result = None
if request.method == "POST":
query = "%" + request.form["query"] + "%"
query_result = db.execute(
"select * from books where isbn like :query or title like :query or author like :query",
{"query": query},
).fetchall()
if query_result == []:
query_result = 0
return render_template("search.html.j2", query_result=query_result)
# request details about a book by isbn returned as an HTML page
@app.route("/book/<string:isbn>")
def book(isbn):
if "username" not in session:
return redirect(url_for("login"))
book_detail = db.execute(
"select * from books where isbn=:isbn", {"isbn": isbn}
).fetchone()
if book_detail is None: # if book isn't found
e = "The book you are looking for does not exist."
return render_template("http_error.html.j2", e=e), 404
# else request details from Good Reads
good_reads = {}
# request review counts from Good Reads api
res = requests.get(
"https://www.goodreads.com/book/review_counts.json",
params={"key": goodreads_key, "isbns": isbn},
)
if res.status_code == 200: # if on Good Reads assign variables
res_dict = json.loads(res.text)
good_reads["status"] = res.status_code
good_reads["average_rating"] = res_dict["books"][0]["average_rating"]
good_reads["ratings_count"] = res_dict["books"][0]["work_ratings_count"]
else: # if not just assign status code
good_reads["status"] = res.status_code
reviews = db.execute(
"select trim(username) as username, trim(displayname) as displayname, review, rating, timestamp from reviews join users on reviews.user_id = users.id where book_id=:book_id",
{"book_id": book_detail["id"]},
).fetchall()
return render_template(
"book.html.j2", book=book_detail, good_reads=good_reads, reviews=reviews
)
# request details about a book by isbn returned in json format
@app.route("/api/<string:isbn>")
def api(isbn):
# search for book in books by isbn passed through endpoint
result = db.execute(
"select * from books where isbn=:isbn", {"isbn": isbn}
).fetchone()
api_response = {}
if result is not None: # check if book was found
# search for review info, count number of reviews and average score
rate_result = db.execute(
"select count(*), round(avg(ALL rating), 1) from reviews where book_id=:book_id",
{"book_id": result["id"]},
).fetchone()
if rate_result["round"] is None: # check if result has a value
average_score = 0.0 # if not then set value to 0.0
else:
average_score = float(
rate_result["round"]
) # cast value into type that json. can process
api_response["title"] = result["title"]
api_response["author"] = result["author"]
api_response["year"] = int(
result["year"]
) # cast year into int as it is char(4) in db
api_response["isbn"] = result["isbn"]
api_response["review_count"] = rate_result["count"]
api_response["average_score"] = average_score
http_response_code = (
200 # set response code to 200, even though that is default
)
else:
api_response["error"] = "isbn not found" # human readable error message
http_response_code = 404 # set response code to 404 as the isbn was not found
return make_response(jsonify(api_response), http_response_code)
@app.errorhandler(404)
def page_not_found(e):
return render_template("http_error.html.j2", e=e), 404
if __name__ == "__main__":
app.run(debug=True)