Add web interface styling and configuration, fix existing long URL retrieval and duplicate short URL checks

config.yml

@@ -27,3 +27,7 @@ allowed_chars: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_
 # Amount of time in seconds to spend generating random short URLs until timeout
 # Default: 5
 random_gen_timeout: 5
+
+# Name shown on tab while on site and on page header
+# Default: 'liteshort'
+site_name: 'liteshort'

liteshort.py

@@ -1,4 +1,4 @@
-from flask import Flask, Response, request, current_app, g, send_from_directory
+from flask import Flask, request, current_app, g, render_template
 import bcrypt
 import random
 import sqlite3
@@ -12,11 +12,11 @@ def load_config():
 
     req_options = {'admin_username': 'admin', 'database_name': "urls", 'random_length': 4,
                    'allowed_chars': 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_',
-                   'random_gen_timeout': 5
+                   'random_gen_timeout': 5, 'site_name': 'liteshort'
                    }
 
     config_types = {'admin_username': str, 'database_name': str, 'random_length': int,
-                    'allowed_chars': str, 'random_gen_timeout': int}
+                    'allowed_chars': str, 'random_gen_timeout': int, 'site_name': str}
 
     for option in req_options.keys():
         if option not in new_config.keys():  # Make sure everything in req_options is set in config
@@ -45,19 +45,18 @@ def check_password(password, pass_config):
         raise RuntimeError('This should never occur! Bailing...')
 
 
-def check_short_exist(database, short):
-    database.cursor().execute("SELECT long FROM urls WHERE short = ?", (short,))
-    result = database.cursor().fetchone()
-    if database.cursor().fetchone():
-        return result
+def check_short_exist(short):
+    query = query_db('SELECT long FROM urls WHERE short = ?', (short,))
+    if query:
+        return True
     return False
 
 
-def check_long_exist(database, long):
-    database.cursor().execute("SELECT short FROM urls WHERE long = ?", (long,))
-    result = database.cursor().fetchone()
-    if database.cursor().fetchone():
-        return result
+def check_long_exist(long):
+    query = query_db('SELECT short FROM urls WHERE long = ?', (long,))
+    for i in query:
+        if i and (len(i['short']) <= current_app.config["random_length"]):  # Checks if query if pre-existing URL is same as random length URL
+            return i['short']
     return False
 
 
@@ -77,6 +76,23 @@ def get_db():
     return g.db
 
 
+def query_db(query, args=(), one=False):
+    cur = get_db().execute(query, args)
+    rv = cur.fetchall()
+    cur.close()
+    return (rv[0] if rv else None) if one else rv
+
+
+def response(rq, short, error_msg=None):
+    if 'json' in rq.form and rq.form['json']:
+        pass
+    else:
+        if short:
+            return render_template("main.html", result=(True, rq.base_url + short))
+        else:
+            return render_template("main.html", result=(False, error_msg))
+
+
 config = load_config()
 
 app = Flask(__name__)
@@ -85,36 +101,36 @@ app.config.update(config)  # Add loaded YAML config to Flask config
 
 @app.route('/')
 def main():
-    return send_from_directory('static', 'main.html')
+    return render_template("main.html")
 
 
 @app.route('/', methods=['POST'])
 def main_post():
     if 'long' in request.form and request.form['long']:
-        database = get_db()
         if 'short' in request.form and request.form['short']:
             for char in request.form['short']:
                 if char not in current_app.config['allowed_chars']:
-                    return Response('Character ' + char + ' not allowed in short URL.', status=200)
+                    return response(request, None, 'Character ' + char + ' not allowed in short URL.')
             short = request.form['short']
         else:
             timeout = time.time() + current_app.config['random_gen_timeout']
             while True:
                 if time.time() >= timeout:
-                    return Response('Timeout while generating random short URL.', status=200)
+                    return response(request, None, 'Timeout while generating random short URL.')
                 short = generate_short()
-                if not check_short_exist(database, short):
+                if not check_short_exist(short):
                     break
-        short_exists = check_short_exist(database, short)
-        long_exists = check_long_exist(database, request.form['long'])
-        if long_exists and 'short' not in request.form:
-            return request.base_url + long_exists
+        short_exists = check_short_exist(short)
+        long_exists = check_long_exist(request.form['long'])
+        if long_exists and not ('short' in request.form and request.form['short']):
+            return response(request, long_exists)
         if short_exists:
-            return Response('Short URL already exists.', status=200)
+            return response(request, None, "Short URL already exists.")
+        database = get_db()
         database.cursor().execute("INSERT INTO urls (long,short) VALUES (?,?)", (request.form['long'], short))
         database.commit()
         database.close()
-        return "Your shortened URL is available at " + request.base_url + short
+        return response(request, short)
     else:
         return "Long URL required!"
 

static/main.html

@@ -1,20 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <title>liteshort</title>
-</head>
-<body>
-    <form>
-        Long URL:
-        <br>
-        <input name="long" type="url">
-        <br>
-        Short URL:
-        <br>
-        <input name="short" type="text">
-        <br> <!-- TODO: Use CSS to do linebreaks -->
-        <input type="submit" value="Shorten" formmethod="post">
-    </form>
-</body>
-</html>

static/styles.css

@@ -0,0 +1,46 @@
+div.form {
+  margin-top: 5%;
+  text-align: center;
+}
+
+input {
+  margin: auto;
+}
+
+div.success {
+  display: inline-block;
+  font-family: Open Sans;
+  border-radius: 2vh;
+  padding: 2vh;
+  color: #62ad2c;
+  background-color: #E9FFD9;
+  border: 1px solid #62ad2c;
+}
+
+
+div.error {
+  display: inline-block;
+  font-family: Open Sans;
+  border-radius: 2vh;
+  padding: 2vh;
+  color: #a86464;
+  background-color: #FCE9E9;
+  border: 1px solid #a86464;
+}
+
+body {
+  text-align: center
+}
+
+div.success > a:link {
+  color: #62ad2c;
+}
+
+div.success > a:visited {
+  color: #507c52;
+}
+
+h2 {
+  font-weight: normal;
+  font-family: Open Sans;
+}

templates/main.html

@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>{{ config.site_name }}</title>
+    <link rel="stylesheet" href="https://unpkg.com/purecss@1.0.0/build/pure-min.css">
+    <link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet">  
+    <link rel="stylesheet" href="{{ url_for('static', filename='styles.css') }}">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body>
+    <div class="form">
+        <h2>{{ config.site_name }}</h2>
+        <form class="pure-form">
+            <input name="long" type="url" placeholder="Long URL">
+            <p>
+            <input name="short" type="text" placeholder="Custom link (optional)">
+            <p>
+            <button type="submit" class="pure-button pure-button-primary" formmethod="post">Shorten</button>
+        </form>
+    </div>
+    {% if result is defined and result[0] %}
+    <div class="success">
+        ✓ Shortlink successfully generated! Available at  <a href="{{ result[1] }}">{{ result[1] }}</a>
+    </div>
+    {% elif result is defined and not result[0] %}
+    <div class="error">
+        ✖ Shortlink failed to generate! {{ result[1] }}
+    </div>
+    {% endif %}
+</body>
+</html>