1 files changed, 96 insertions, 0 deletions
diff --git a/helpers.py b/helpers.py
new file mode 100644
index 0000000..e55b395
--- /dev/null
+++ b/helpers.py
@@ -0,0 +1,96 @@
+import os
+import re
+import requests
+import urllib.parse
+
+from bs4 import BeautifulSoup
+from flask import flash, redirect, render_template, request, session
+from functools import wraps
+
+
+# Display apology message in case of an error
+def apology(message, code=400):
+    def escape(s):
+        """
+        Escape special characters.
+
+        https://github.com/jacebrowning/memegen#special-characters
+        """
+        for old, new in [("-", "--"), (" ", "-"), ("_", "__"), ("?", "~q"),
+                         ("%", "~p"), ("#", "~h"), ("/", "~s"), ("\"", "''")]:
+            s = s.replace(old, new)
+        return s
+    flash("Apologies, something went wrong...")
+    return render_template("apology.html", top=code, bottom=escape(message)), code
+
+
+def deal_finder(item):
+    """ Scraping best deals on ebay for the user-specified item """
+
+    # https://www.networkinghowtos.com/howto/common-user-agent-list/
+    header = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36'}
+    # https://stackoverflow.com/questions/1549641/how-can-i-capitalize-the-first-letter-of-each-word-in-a-string
+    item_spelling = " ".join(word[0].upper() + word[1:] for word in item.split())
+
+    # Setup for displaying ebay results with the filter option "Price + Shipping: lowest first"
+    search_term = item.replace(" ", "+")
+    url = f"https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw={search_term}&_sacat=0&_sop=15"
+    webpage = requests.get(url, headers=header).text
+    soup = BeautifulSoup(webpage, "lxml")
+
+    offers = {}
+    # getting a list of all divs that contain the info on each individual offer
+    all_offers = soup.find_all("div", class_="s-item__info clearfix")
+    for item in all_offers:
+        # checking for matches in all caps too
+        if item.find(text=re.compile(item_spelling)) != None and item.find(text=re.compile(item_spelling.upper())) == None:
+            name = item.find(text=re.compile(item_spelling))
+        elif item.find(text=re.compile(item_spelling)) == None and item.find(text=re.compile(item_spelling.upper())) != None:
+            name = item.find(text=re.compile(item_spelling.upper()))
+        else:
+            continue
+
+        # getting the price of each item
+        if item.find("span", class_="s-item__price").string == None:
+            continue
+        price = item.find("span", class_="s-item__price").string.replace("$", "")
+
+        # getting the link to the page of each item
+        if item.a["href"] == None:
+            continue
+        link = item.a["href"]
+
+        # the following code for "offers" & "best_deals" is based on: https://www.youtube.com/watch?v=zAEfWiC_KBU&t=1232s
+        offers[name] = {"price": float(price.replace(",", "")), "link": link}
+
+    best_deals = sorted(offers.items(), key=lambda x: x[1]["price"])
+    return(best_deals)
+
+
+def login_required(f):
+    """
+    Decorate routes to require login.
+
+    https://flask.palletsprojects.com/en/1.1.x/patterns/viewdecorators/
+    """
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        if session.get("user_id") is None:
+            return redirect("/login")
+        return f(*args, **kwargs)
+    return decorated_function
+
+
+def passw_requirements(password):
+    """ Password requirements for registrating an account """
+
+    pw_length = len(password)
+    if pw_length in range(6,25) and password.isalpha() == False and password.isnumeric() == False:
+        return "valid"
+    else:
+        return "invalid"
+
+
+# Display a float as US-Dollar
+def usd(value):
+    return f"${value:,.2f}"