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app.py
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app.py
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from flask import Flask, redirect, url_for
from flask import render_template, request
import psycopg2
import random
import datetime
app = Flask(__name__)
conn = psycopg2.connect(
host="10.17.50.36",
database="group_35",
user="group_35",
password="VxGj6gCyWTKyM"
# host = "localhost",
# database = "postgres",
# user = "postgres",
# password = "postgres"
)
db = conn.cursor()
current_login = {
"username":"undef",
"userid":"undef"
}
def get_curr_timestamp():
ts = datetime.datetime.now()
return str(ts.year)+"-"+str(ts.month)+"-"+str(ts.day)+" "+str(ts.hour)+":"+str(ts.minute)+":"+str(ts.second)
def buttonhandler(form, userid = None, tweetid=None, tweet=None, calledfrom=None):
if 'addchirpbutton' in form:
if(current_login["userid"] == 'undef'):
return redirect(url_for("login"))
else:
db.execute("insert into tweets(userid, tweet, tweettime, response_tweets, in_response_to_tweet) values("
+str(current_login["userid"])+", '"
+form.get('addchirp')+"', '"
+get_curr_timestamp()+"', array[]::integer[], array[]::integer[]) returning tweetid;")
ntweetid = db.fetchall()[0][0]
db.execute("insert into like_nums values("+str(ntweetid)+", 0);")
conn.commit()
return redirect(url_for('home'))
elif 'searchbutton' in form and len(form['search'])>0:
return redirect(url_for('search', searchquery=form.get('search')))
elif 'followbutton' in form:
if current_login["userid"] != 'undef':
db.execute("insert into followers values("+str(current_login["userid"])+","+str(userid)+");")
conn.commit()
return redirect(url_for('userpage', userid=userid))
else:
return redirect(url_for('login', wrongcreds=0))
elif 'followingbutton' in form:
if current_login["userid"] != 'undef':
db.execute("delete from followers where fr="+str(current_login["userid"])+" and fe="+str(userid)+";")
conn.commit()
return redirect(url_for('userpage', userid=userid))
else:
return redirect(url_for('login', wrongcreds=0))
elif 'responsebutton' in form and len(form.get('addresponse'))>0:
if(current_login["userid"] == 'undef'):
return redirect(url_for("login", wrongcreds=False))
else:
db.execute("insert into tweets(userid, tweet, tweettime, response_tweets, in_response_to_tweet) values("
+str(current_login["userid"])+", '"
+form.get('addresponse')+"', '"
+get_curr_timestamp()+"', array[]::integer[], array["+str(tweet[2])+"]) returning tweetid;")
newtweetid = db.fetchall()
db.execute("insert into like_nums values("+str(newtweetid[0][0])+", 0);")
conn.commit()
db.execute("update tweets set response_tweets = response_tweets || "+str(newtweetid[0][0])+" where tweetid = "+str(tweet[2])+";")
conn.commit()
return redirect(url_for('tweetpage', tweetid=tweetid))
elif 'login' in form:
return redirect(url_for('login', wrongcreds=0))
elif 'logout' in form:
logout()
return redirect(url_for('home'))
elif 'loginbutton' in form:
username = form['username']
password = form['password']
db.execute("select userid from users where username = '"+str(username)+"' and password = '"+str(password)+"';")
res = db.fetchall()
if len(res) == 1 :
current_login['userid'] = res[0][0]
current_login['username'] = username
db.execute('drop view if exists followers;')
conn.commit()
db.execute('drop view if exists userlikes;')
conn.commit()
db.execute("create view followers as select fr, fe from network where fr = "+str(current_login["userid"])+";")
conn.commit()
db.execute("create view userlikes as select tweetid, userid from likes where userid = '"+str(current_login['userid'])+"';")
conn.commit()
return redirect(url_for('home'))
else:
return redirect(url_for('login', wrongcreds=1))
elif 'signupbutton' in form:
username = form['username']
password = form['password']
db.execute("select userid from users where username = '"+str(username)+"';")
res = db.fetchall()
if len(res) == 0 :
db.execute("insert into users(username, password) values('"+str(username)+"', '"+str(password)+"') returning userid;")
res = db.fetchall()
conn.commit()
current_login['userid'] = res[0][0]
current_login['username'] = username
db.execute('drop view if exists followers;')
conn.commit()
db.execute('drop view if exists userlikes;')
conn.commit()
db.execute("create view followers as select fr, fe from network where fr = "+str(current_login["userid"])+";")
conn.commit()
db.execute("create view userlikes as select tweetid, userid from likes where userid = '"+str(current_login['userid'])+"';")
conn.commit()
return redirect(url_for('home'))
else:
return redirect(url_for('login', wrongcreds=2))
elif 'profilebutton' in form:
return redirect(url_for('userpage', userid=current_login["userid"]))
elif 'likebutton' in form:
if current_login["userid"] == 'undef':
return redirect(url_for('login', wrongcreds=0))
else:
db.execute("insert into userlikes values("+str(form['likebutton'])+","+str(current_login["userid"])+");")
conn.commit()
db.execute("update like_nums set like_num = like_num + 1 where tweetid = "+str(form['likebutton'])+";")
conn.commit()
if calledfrom == 'home':
return redirect(url_for('home'))
elif calledfrom == 'userpage':
return redirect(url_for('userpage', userid=userid))
elif calledfrom == 'tweetpage':
return redirect(url_for('tweetpage', tweetid=tweetid))
elif 'likedbutton' in form:
db.execute("delete from userlikes where tweetid = "+str(form['likedbutton'])+" and userid = "+str(current_login["userid"])+";")
conn.commit()
db.execute("update like_nums set like_num = like_num - 1 where tweetid = "+str(form['likedbutton'])+";")
conn.commit()
if calledfrom == 'home':
return redirect(url_for('home'))
elif calledfrom == 'userpage':
return redirect(url_for('userpage', userid=userid))
elif calledfrom == 'tweetpage':
return redirect(url_for('tweetpage', tweetid=tweetid))
@app.route('/', methods=["POST", "GET"])
def home():
posts = [[]]
users = [[]]
extra = [[]]
recm = [[]]
if current_login["userid"] == "undef":
db.execute("select u.username, t.tweet, t.tweettime, u.userid, t.tweetid, l.like_num from tweets t, users u, like_nums l where u.userid = t.userid and t.tweetid = l.tweetid order by tweettime desc fetch first 200 rows only;")
posts = db.fetchall()
db.execute("select username, userid from users order by random() fetch first 200 rows only;")
users = db.fetchall()
else:
db.execute("select u.username, t.tweet, t.tweettime, u.userid, t.tweetid, l.like_num, case when t.tweetid = any(select tweetid from userlikes) then 'TRUE' else 'FALSE' end as userliked from tweets t, users u, like_nums l where u.userid = t.userid and t.tweetid = l.tweetid and u.userid = "+str(current_login["userid"])+" union select u.username, t.tweet, t.tweettime, u.userid, t.tweetid, l.like_num, case when t.tweetid = any(select tweetid from userlikes) then 'TRUE' else 'FALSE' end as userliked from tweets t, users u, followers f, like_nums l where u.userid = t.userid and f.fe = u.userid and t.tweetid = l.tweetid order by tweettime desc fetch first 200 rows only;")
posts = db.fetchall()
db.execute("select username, u.userid from users u, followers f where f.fe = u.userid fetch first 200 rows only;")
users = db.fetchall()
db.execute("select u.userid, username from users u, (select userid from users where not userid = "+str(current_login["userid"])+" except select fe as userid from followers) as diff where diff.userid = u.userid order by random() fetch first 200 rows only;")
extra = db.fetchall()
db.execute("with recm as ((select fe from network where fr = any (select fe from followers) union select fr from network where fe = any (select fe from followers)) except select fe from followers) select userid, username from recm, users where fe = userid and not userid = "+str(current_login["userid"])+" fetch first 200 rows only;")
recm = db.fetchall()
if len(recm) == 0:
recm = extra
if request.method == "POST":
rval = buttonhandler(request.form, calledfrom='home')
if rval!=None:
return rval
return render_template("index.html", posts=posts, users=users, loginuser=[current_login["userid"],current_login["username"]], extra=extra, recm=recm)
@app.route("/search/<string:searchquery>", methods=["POST", "GET"])
def search(searchquery):
db.execute("select u.userid, t.tweetid, u.username, t.tweet, t.tweettime from tweets t, users u where u.userid = t.userid and lower(tweet) like lower('%"+searchquery+"%') order by tweettime desc fetch first 200 rows only;")
tweetresults = db.fetchall()
db.execute("select userid, username from users where lower(username) like lower('%"+searchquery+"%') fetch first 200 rows only;")
userresults = db.fetchall()
if request.method == "POST":
rval = buttonhandler(request.form)
if rval!=None:
return rval
return render_template("search.html", results=tweetresults, userresults=userresults, searchquery=searchquery, loginuser=[current_login["userid"],current_login["username"]])
@app.route("/login/<int:wrongcreds>", methods=["POST", "GET"])
def login(wrongcreds):
wd = "false"
if wrongcreds == 1:
wd = "Username or password is invalid"
elif wrongcreds == 2:
wd = "A user with same username already exists"
if request.method == "POST":
rval = buttonhandler(request.form)
if rval != None:
return rval
return render_template("login.html", wrongcreds=wd)
@app.route('/user/<int:userid>', methods=["POST", "GET"])
def userpage(userid):
db.execute("select username from users where userid = "+str(userid)+";")
username=db.fetchall()[0][0]
db.execute("select u.username, t.tweet, t.tweettime, t.tweetid from tweets t, users u where u.userid = t.userid and u.userid = "+str(userid)+" order by tweettime desc fetch first 200 rows only;")
tweets=db.fetchall()
isfollowing = False
if(current_login["userid"] != 'undef'):
db.execute("select fr,fe from followers where fe = "+str(userid)+";")
nid = db.fetchall()
if(len(nid)>0):
isfollowing = True
if request.method == "POST":
rval = buttonhandler(request.form, userid=userid)
if rval != None:
return rval
return render_template("user.html", loginuser=[current_login['userid'],current_login["username"]], user=[userid, username], tweets=tweets, isfollowing=isfollowing)
def logout():
current_login["userid"] = "undef"
current_login["username"] = "undef"
db.execute("drop view if exists followers;")
conn.commit()
return
@app.route('/tweet/<int:tweetid>', methods=["POST", "GET"])
def tweetpage(tweetid):
if current_login["userid"] == 'undef':
db.execute("select u.userid, u.username, t.tweetid, t.tweet, t.tweettime, t.in_response_to_tweet, t.response_tweets, l.like_num from tweets t, users u, like_nums l where u.userid = t.userid and t.tweetid = "+str(tweetid)+" and t.tweetid = l.tweetid;")
else:
db.execute("select u.userid, u.username, t.tweetid, t.tweet, t.tweettime, t.in_response_to_tweet, t.response_tweets, l.like_num, case when t.tweetid = any(select tweetid from userlikes) then 'TRUE' else 'FALSE' end as userliked from tweets t, users u, like_nums l where u.userid = t.userid and t.tweetid = l.tweetid and t.tweetid = "+str(tweetid)+"; ")
tweet = db.fetchall()[0]
posts=[]
if((tweet[6]) != None and len(tweet[6])>0):
db.execute("select u.username, t.tweet, t.tweettime, u.userid, t.tweetid from tweets t, users u where u.userid = t.userid and t.tweetid = any(array"+str(tweet[6])+") order by tweettime desc fetch first 200 rows only;")
posts=db.fetchall()
if request.method == "POST":
rval = buttonhandler(request.form, tweetid=tweetid, tweet=tweet, calledfrom='tweetpage')
if rval != None:
return rval
inrespto = []
if(tweet[5] != None and len(tweet[5])==1):
db.execute("select u.username, t.tweet, t.tweettime, u.userid, t.tweetid from tweets t, users u where u.userid = t.userid and t.tweetid = "+str(tweet[5][0])+";")
inrespto = db.fetchall()[0]
return render_template("tweet.html", tweet=tweet, loginuser=[current_login["userid"],current_login["username"]], posts=posts, inrespto=inrespto)