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app.py
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app.py
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import os
from flask import Flask, flash, redirect, render_template, request, session, jsonify
from flask_session import Session
from werkzeug.exceptions import default_exceptions, HTTPException, InternalServerError
from werkzeug.security import check_password_hash, generate_password_hash
import sqlite3
from newsapi import NewsApiClient
from helpers import login_required
# Initialise NewsAPI
newsapi = NewsApiClient(api_key=os.getenv('API_KEY'))
domains = 'bbc.co.uk,theguardian.com,telegraph.co.uk,channel4.com,sky.com'
# Configure application
app = Flask(__name__)
app.config["TEMPLATES_AUTO_RELOAD"] = True
app.config['SESSION_TYPE'] = 'filesystem'
app.config.from_object(__name__)
Session(app)
db = 'info.db'
# Ensure responses aren't cached
@app.after_request
def after_request(response):
response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
response.headers["Expires"] = 0
response.headers["Pragma"] = "no-cache"
return response
@app.route("/", methods=['GET'])
def index():
# Obtain a list of all the user's saved articles
# If user is not logged in, return None
if 'user_id' not in session:
saved_titles = None
else:
saved_titles = find_saved_titles(session['user_id'])
categories = ['Politics', 'Finance', 'Technology', 'Sport', 'World']
top_headlines = find_headlines()
if top_headlines == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
article_dicts = []
for category in categories:
articles = find_articles(category, page_size=3)
if articles == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
article_dict = {'category': category, 'articles': articles}
article_dicts.append(article_dict)
return render_template('index.html', headlines=top_headlines, all_articles=article_dicts, saved_titles=saved_titles)
@app.route("/saving", methods=['POST'])
def saving():
"""Add an article to a user's save list."""
title = request.form['title']
conn = sqlite3.connect(db)
c = conn.cursor()
with conn:
# Check if the article is in the articles table
c.execute("SELECT * FROM articles WHERE title = :title", {'title': title})
if len(c.fetchall()) == 0:
url = request.form['url']
image_url = request.form['image_url']
description = request.form['description']
print(description)
c.execute("INSERT INTO articles (title, url, image_url, description) VALUES (:title, :url, :image_url, :description)",
{'title': title, 'url': url, 'image_url': image_url, 'description': description})
# Obtain the id of the article from the articles table
c.execute("SELECT id FROM articles WHERE title = :title", {'title': title})
article_id = c.fetchone()[0]
# Check if the article is already in the user_articles table
c.execute("SELECT user_id, article_id FROM user_articles WHERE user_id = :user_id AND article_id = :article_id", {'user_id': session['user_id'], 'article_id': article_id})
if len(c.fetchall()) == 0:
# Add the article to the user_articles table
c.execute("INSERT INTO user_articles (user_id, article_id) VALUES (:user_id, :article_id)", {'user_id': session['user_id'], 'article_id': article_id})
else:
# Remove the article from the user_articles table
c.execute("DELETE FROM user_articles WHERE user_id = :user_id AND article_id = :article_id", {'user_id': session['user_id'], 'article_id': article_id})
return redirect('/')
@app.route("/saved", methods=['GET', 'POST'])
@login_required
def saved():
"""List a user's saved articles from the user_articles table"""
saved_articles, saved_titles = find_saved_articles(session['user_id'])
if saved_articles == None:
return render_template('empty.html', title='Saved Articles', message="You have no saved articles")
# Transfer the article info into a dictionary
return render_template('results.html', title='Saved Articles', articles=saved_articles, saved_titles=saved_titles, page=1)
@app.route("/results")
def results():
"""Display more results."""
return redirect('/saved')
@app.route("/sport")
def sport():
"""Display a list of sport articles"""
# Obtain a list of all the user's saved articles
# If user is not logged in, return None
if 'user_id' not in session:
saved_titles = None
else:
saved_titles = find_saved_titles(session['user_id'])
# Obtain a list of article dictionaries for the sport query
articles = find_articles('sport', page_size=10, page=1)
if articles == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
return render_template('results.html', title='Sport', articles=articles, saved_titles=saved_titles)
@app.route("/technology")
def technology():
"""Display a list of technology articles"""
# Obtain a list of all the user's saved articles
# If user is not logged in, return None
if 'user_id' not in session:
saved_titles = None
else:
saved_titles = find_saved_titles(session['user_id'])
# Obtain a list of article dictionaries for the sport query
articles = find_articles('technology', page_size=10, page=1)
if articles == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
return render_template('results.html', title='Technology', articles=articles, saved_titles=saved_titles)
@app.route("/politics")
def politics():
"""Display a list of politics articles"""
# Obtain a list of all the user's saved articles
# If user is not logged in, return None
if 'user_id' not in session:
saved_titles = None
else:
saved_titles = find_saved_titles(session['user_id'])
# Obtain a list of article dictionaries for the sport query
articles = find_articles('politics', page_size=10, page=1)
if articles == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
return render_template('results.html', title='Politics', articles=articles, saved_titles=saved_titles)
@app.route("/finance")
def finance():
"""Display a list of finance articles"""
# Obtain a list of all the user's saved articles
# If user is not logged in, return None
if 'user_id' not in session:
saved_titles = None
else:
saved_titles = find_saved_titles(session['user_id'])
# Obtain a list of article dictionaries for the sport query
articles = find_articles('finance', page_size=10, page=1)
if articles == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
return render_template('results.html', title='Finance', articles=articles, saved_titles=saved_titles)
@app.route("/world")
def world():
"""Display a list of world articles"""
# Obtain a list of all the user's saved articles
# If user is not logged in, return None
if 'user_id' not in session:
saved_titles = None
else:
saved_titles = find_saved_titles(session['user_id'])
# Obtain a list of article dictionaries for the sport query
articles = find_articles('world', page_size=10, page=1)
if articles == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
return render_template('results.html', title='World', articles=articles, saved_titles=saved_titles)
@app.route("/search")
def search():
"""Search for any category"""
query = request.args.get('q')
if 'user_id' not in session:
saved_titles = None
else:
saved_titles = find_saved_titles(session['user_id'])
# Obtain a list of article dictionaries for the sport query
articles = find_articles(query, page_size=10, page=1)
if articles == None:
return render_template('empty.html', title='Error', message="Error retrieving NewsAPI data")
return render_template('results.html', title='Search', articles=articles, saved_titles=saved_titles)
@app.route("/login", methods=["GET", "POST"])
def login():
"""Log user in"""
# Forget any user_id
session.clear()
# User reached route via POST (as by submitting a form via POST)
if request.method == "POST":
# Ensure username was submitted
if not request.form.get("username"):
return render_template("login.html", error=1)
# Ensure password was submitted
elif not request.form.get("password"):
return render_template('login.html', error=2)
# Query database for username
conn = sqlite3.connect(db)
conn.row_factory = sqlite3.Row
c = conn.cursor()
with conn:
c.execute("SELECT * FROM users WHERE username = :username", {'username': request.form.get("username")})
rows = c.fetchall()
# Ensure username exists and password is correct
if len(rows) != 1 or not check_password_hash(rows[0]["hash"], request.form.get("password")):
return render_template('login.html', error=3)
# Remember which user has logged in
session["user_id"] = rows[0]["id"]
# Redirect user to home page
flash('You were successfully logged in')
return redirect("/")
# User reached route via GET (as by clicking a link or via redirect)
else:
return render_template("login.html")
@app.route("/logout")
def logout():
"""Log user out"""
# Forget any user_id
session.clear()
# Redirect user to login form
return redirect("/login")
@app.route("/register", methods=["GET", "POST"])
def register():
"""Register user"""
if request.method == "POST":
# Connect to the database
# Check if a username and password has been entered
username = request.form.get("username")
password = request.form.get("password")
if not username or len(username) < 4 or len(username) > 20:
return render_template("register.html", error=1)
if not password or len(password) < 4 or len(password) > 20:
return render_template("register.html", error=2)
# Check if the passwords match
if password != request.form.get("confirmation"):
return render_template("register.html", error=3)
# Check if the username has been taken
conn = sqlite3.connect(db)
conn.row_factory = sqlite3.Row
c = conn.cursor()
with conn:
c.execute("SELECT * FROM users WHERE username = :username", {'username': username})
rows = c.fetchall()
if len(rows) != 0:
return render_template("register.html", error=4)
# Hash the password before storing it in the database
hash_password = generate_password_hash(password)
# Add the new user information to the database
with conn:
c.execute("INSERT INTO users (username, hash) VALUES (:username, :hash)", {'username': username, 'hash': hash_password})
conn.commit()
# Log the user in using the details they provided
with conn:
c.execute("SELECT * FROM users WHERE username = :username", {'username': request.form.get("username")})
rows = c.fetchall()
session["user_id"] = rows[0]["id"]
flash('Account created!')
return redirect("/")
else:
return render_template("register.html")
@app.route("/account", methods=['GET', 'POST'])
@login_required
def account():
"""Display account information and password change option"""
if request.method == 'POST':
conn = sqlite3.connect(db)
c = conn.cursor()
with conn:
c.execute("SELECT username FROM users WHERE id = :id", {'id': session['user_id']})
username = c.fetchone()[0]
password = request.form.get("password")
confirmation = request.form.get("confirmation")
# Check if new password is valid
if not password or len(password) < 4 or len(password) > 20:
return render_template("account.html", username=username, error=1)
# Check if passwords match
if password != confirmation:
return render_template("account.html", username=username, error=2)
# Update the password information
hash_password = generate_password_hash(password)
conn = sqlite3.connect(db)
c = conn.cursor()
with conn:
c.execute("UPDATE users SET hash = :hash WHERE id = :id", {'hash': hash_password, 'id': session['user_id']})
rows = c.fetchone()
flash("Your password has been changed")
return render_template("account.html", username=username)
else:
conn = sqlite3.connect(db)
c = conn.cursor()
with conn:
c.execute("SELECT username FROM users WHERE id = :id", {'id': session['user_id']})
rows = c.fetchone()
return render_template("account.html", username=rows[0])
def find_articles(query, page_size=10, page=1):
"""Return the articles dictionary from NewsAPI given a query"""
try:
articles = newsapi.get_everything(language='en',
q=query,
domains = domains,
sort_by='publishedAt',
page=page,
page_size=page_size)
if articles['status'] != 'ok':
return None
articles_reduct = []
for article in articles['articles']:
article_dict = {'title': article['title'],
'url': article['url'],
'urlToImage': article['urlToImage'],
'description': article['description']}
articles_reduct.append(article_dict)
return articles_reduct
# Return None if there is a problem
except Exception as e:
print(e)
return None
def find_saved_titles(user_id):
"""Find the titles of the saved articles for a given user by querying the user_articles table"""
conn = sqlite3.connect(db)
c = conn.cursor()
with conn:
# Find the articles that the user has saved
c.execute("""SELECT * FROM articles WHERE id IN (
SELECT article_id FROM user_articles WHERE user_id = :user_id)""",
{'user_id': user_id})
rows = c.fetchall()
saved_titles = []
for row in rows:
saved_titles.append(row[1])
# If user has no saved articles, return None
if saved_titles == []:
return None
return saved_titles
def find_saved_articles(user_id):
"""Find the saved titles and the article info for a given user"""
conn = sqlite3.connect(db)
c = conn.cursor()
with conn:
# Find the articles that the user has saved
c.execute("""SELECT title, url, image_url, description FROM articles WHERE id IN (
SELECT article_id FROM user_articles WHERE user_id = :user_id)""",
{'user_id': user_id})
rows = c.fetchall()
rows.reverse()
saved_articles = []
saved_titles = []
for row in rows:
article_dict = {'title': row[0],
'url': row[1],
'urlToImage': row[2],
'description': row[3]}
saved_titles.append(row[0])
saved_articles.append(article_dict)
# If user has no saved articles, return None
if saved_articles == [] or saved_titles == []:
return None, None
return saved_articles, saved_titles
def find_headlines(page_size=3, page=1):
"""Return the articles dictionary from NewsAPI given a query"""
try:
top_headlines = newsapi.get_top_headlines(language='en',
# domains = domains,
# sort_by='publishedAt',
country='gb',
page=page,
page_size=page_size)
if top_headlines['status'] != 'ok':
return None
return top_headlines['articles']
# Return None if there is a problem
except Exception as e:
print(e)
return None
if __name__ == '__main__':
app.run()