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diff --git a/Problems/problem.c4 b/Problems/problem.c4
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diff --git a/main.py b/main.py
new file mode 100644
index 0000000..41c0551
--- /dev/null
+++ b/main.py
@@ -0,0 +1,283 @@
+import gzip, json, base64, flask, threading, os, time, functools
+from io import BytesIO
+import pydrive.auth, pydrive.drive, pydrive.files
+import bcrypt
+import flask_limiter, flask_limiter.util
+
+gauth = pydrive.auth.GoogleAuth()
+scope = ['https://www.googleapis.com/auth/drive']
+gauth.credentials = pydrive.auth.ServiceAccountCredentials.from_json_keyfile_dict(json.loads(base64.b64decode(os.getenv('AUTH'))), scope)
+drive = pydrive.drive.GoogleDrive(gauth)
+
+
+for i in os.listdir('Problems/'):
+    os.remove('Problems/' + i)
+for i in drive.ListFile().GetList():
+    i.GetContentFile('Problems/' + i['title'])
+
+app = flask.Flask('')
+app.config['MAX_CONTENT_LENGTH'] = 1024 * 1024 * 5
+app.config['SECRET_KEY'] = base64.b64decode(os.getenv('KEY'))
+app.config['AUTH_TIMEOUT'] = 15 # seconds
+
+limiter = flask_limiter.Limiter(app, key_func=flask_limiter.util.get_remote_address)
+rate_limit = limiter.shared_limit("1/second;30/minute", scope="gdrive")
+
+@app.before_request
+def run_auth():
+    flask.g.auth = None
+    is_auth()
+
+def is_auth():
+    if flask.g.auth:
+        return flask.g.auth
+    login = False
+    timeout = False
+    if 'auth' not in flask.session:
+        flask.session['auth'] = None
+    if flask.session['auth'] is not None:
+        timeout = time.time() - flask.session['auth'] > app.config['AUTH_TIMEOUT']
+        if timeout: print(flask.request.endpoint)
+        login = not timeout
+    flask.session['auth'] = time.time() if login else None
+    flask.g.auth = {'ok': login, 'message': 'Sucessfully authorized.' if login else 'Your session has expired. Refresh the page to log in again.' if timeout else 'You must log in to perform this action.'}
+    return flask.g.auth
+
+app.jinja_env.globals.update(is_auth=is_auth)
+
+def needs_auth(f):
+    @functools.wraps(f)
+    def wrapper(*args, **kwargs):
+        authed = is_auth()
+        if not authed['ok']:
+            if flask.request.method == "GET":
+                return flask.redirect(flask.url_for('route_login', next=flask.request.full_path))
+            else:
+                return authed, 403
+        return f(*args, **kwargs)
+    return wrapper
+
+@app.errorhandler(429)
+@app.errorhandler(pydrive.files.ApiRequestError)
+def rate_limited(e):
+    return {'ok': False, 'message': 'You are performing this action too quickly. You must wait before trying again.'}, 429
+
+@app.route('/favicon.ico')
+def route_favicon():
+    return flask.send_from_directory('static', filename='img/favicon.ico')
+
+
+
+@app.route('/')
+def route_index():
+    return flask.render_template('index.html')
+
+
+
+@app.route('/problems', methods=['GET', 'POST'])
+def route_problems():
+    return {'GET': route_problems_get, 'POST': route_problems_post}[flask.request.method]()
+    
+@needs_auth
+def route_problems_get():
+    return flask.render_template('problems.html', problems=os.listdir('Problems'))
+    
+def route_problems_post():
+    out = {}
+    for filename in os.listdir('Problems'):
+        with open('Problems/' + filename, 'rb') as f:
+            f.seek(-12, os.SEEK_END)
+            out[filename] = base64.b64encode(f.read()).decode('utf8')
+    return json.dumps(out)
+
+
+
+@app.route('/create')
+@needs_auth
+def route_create():
+    filename = flask.request.args.get('edit')
+    problem = None if filename is None else unproblem(filename)
+    if problem is not None:
+        problem['tests'] = [[int(i['visible']), i['input'], i['output']] for i in problem['tests']]
+        problem['images'] = list(problem['images'].keys())
+    return flask.render_template('create.html', filename=os.path.splitext(filename or '')[0], problem=problem)
+
+
+
+@app.route('/problems/<name>', methods=['GET', 'POST', 'DELETE'])
+def route_problem(name):
+    return {'GET': route_problem_get, 'POST': route_problem_post, 'DELETE': route_problem_delete}[flask.request.method](name)
+
+def route_problem_get(name):
+    return flask.send_file('Problems/' + name, as_attachment=True)
+
+@needs_auth
+@rate_limit
+def route_problem_post(oldname):
+    old = unproblem(oldname)
+
+    name = flask.request.form.get('name')
+    filename = flask.request.form.get('filename')
+    text = flask.request.form.get('text')
+
+    if any(i is None or len(i.strip()) == 0 for i in [name, filename, text]):
+        return {'ok': False, 'message': f'missing name/filename/text\n{name}\n{filename}\n{text}'}
+
+    tests = []
+    for i in range(1, 26):
+        test = {'visible': flask.request.form.get('visible_' + str(i)) == '1', 'input': flask.request.form.get('input_' + str(i)), 'output': flask.request.form.get('output_' + str(i))}
+        if all(test[i] is not None and len(str(test[i]).strip()) > 0 for i in test):
+            tests.append(test)
+
+    
+    images = {}
+    for i in range(1, 11):
+        imgname = flask.request.form.get('filename_img_' + str(i))
+        img = flask.request.files.get('img_' + str(i))
+        if imgname is not None and img is not None:
+            img = img.read()
+            imgname = filenamify(imgname, False)
+            if len(img) == 0:
+                if old and imgname in old['images']:
+                    oldimg = old['images'][imgname]
+                    if oldimg:
+                     images[imgname] = oldimg
+            else:
+                images[imgname] = b64(img)
+    
+    problem(filenamify(filename, True), oldname=oldname, name=namify(name), text=text[:1024*1024], tests=tests, images=images)
+    return {'ok': True, 'message': 'made problem'}
+
+@needs_auth
+@rate_limit
+def route_problem_delete(name):
+    gfiles = drive.ListFile({'q': f" title='{name}' "}).GetList()
+    if not gfiles:
+        return {'ok': False, 'message': f'No problem "{name}" exists.'}, 404
+    gfiles[0].Delete()
+    if os.path.exists('Problems/' + name):
+        os.remove('Problems/' + name)
+    return {'ok': True, 'message': f'Successfully deleted problem "{name}".'}
+
+
+
+@app.route('/login', methods=['GET', 'POST'])
+def route_login():
+    if flask.request.method == 'GET':
+        return flask.redirect(flask.request.args.get('next') or flask.url_for('route_index')) if is_auth()['ok'] else flask.render_template('login.html')
+    elif flask.request.method == 'POST':
+        flask.session['auth'] = None
+        json = flask.request.json
+        password = json.get('password') if json else None
+        out = {'ok': False, 'message': 'You must supply a password.'}
+        if password:
+            out['ok'] = bcrypt.checkpw(str(password).encode('utf-8'), os.getenv('PW').encode('utf-8'))
+            if out['ok']:
+                flask.session['auth'] = time.time()
+                out['message'] = 'Successfully logged in.'
+            else:
+                out['message'] = 'Incorrect password.'
+        return out
+    
+
+
+@app.route('/logout')
+def route_logout():
+    flask.session['auth'] = None
+    return flask.render_template('logout.html')
+
+
+
+def run():
+    app.run(host='0.0.0.0', port=8080)
+threading.Thread(target=run).start()
+
+
+
+
+
+
+def compress(bytes):
+    if type(bytes) is str:
+        bytes = bytearray(bytes, encoding='utf8')
+    return gzip.compress(bytes)
+
+def decompress(bytes):
+    return gzip.decompress(bytes).decode("utf8")
+
+def checksum(string):
+    #print('---')
+    #print(list(string))
+    #print('---')
+    mask = (1 << 96) - 1
+    out = mask
+    with BytesIO(string) as f:
+        while True:
+            nbytes = f.read(12)
+            if len(nbytes) == 0:
+                break
+            out ^= int.from_bytes(nbytes, 'little')
+            out <<= 1
+            out |= out >> 96
+            out &= mask
+    #print(list(out.to_bytes(12, byteorder='big')[::-1]))
+    return out.to_bytes(12, byteorder='big')[::-1]
+
+def problem(filename, oldname=None, **kwargs):
+    out = {}
+    for k, v in kwargs.items():
+        out[k] = v
+    #print(json.dumps(out))
+    #print(compress(json.dumps(out)))
+    #print(checksum(compress(json.dumps(out))))
+    #print(json.dumps(out))
+    #print(len(json.dumps(out)))
+    compressed = compress(json.dumps(out))
+    #print(len(compressed))
+    with open('Problems/' + filename, 'wb') as file:
+        #print('-----' + str(list(compressed)))
+        file.write(compressed)
+        check = checksum(compressed)
+        #print(check)
+        file.write(check)
+    if oldname and oldname != filename and os.path.exists('Problems/' + oldname):
+        os.remove('Problems/' + oldname)
+    gfiles = drive.ListFile({'q': f" title='{oldname or filename}' "}).GetList()
+    file = drive.CreateFile({'id': gfiles[0]['id']} if gfiles else {'title': filename}) 
+    file['title'] = filename
+    file.Upload()
+    file.SetContentFile('Problems/' + filename)
+    file.Upload()
+
+def unproblem(filename):
+    try:
+        with open('Problems/' + filename, 'rb') as file:
+            file.seek(-12, os.SEEK_END)
+            length = file.tell()
+            check = file.read()
+            file.seek(0)
+            data = file.read(length)
+            if check != checksum(data):
+                print(f'CHECKSUM: {check} - {checksum(data)}')
+                return None
+            decompressed = json.loads(decompress(data))
+            return decompressed
+    except Exception as e:
+        print('ERROR (unproblem): ' + str(e))
+        return None
+
+def b64(str):
+    return base64.b64encode(str).decode('utf8')
+
+def namify(name):
+    return ' '.join(name.split())[:32]
+
+def filenamify(name, extension):
+    allowed = 'abcdefghijklmnopqrstuvwyxzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-'
+    disallowed = 'CON PRN AUX CLOCK NUL COM1 COM2 COM3 COM4 COM5 COM6 COM7 COM8 COM9 LPT1 LPT2 LPT3 LPT4 LPT5 LPT6 LPT7 LPT8 LPT9'.split(' ')
+    name = ''.join(i.lower() for i in name if i in allowed)[:32]
+    if not name or name.upper() in disallowed:
+        name += '_'
+    if extension:
+        name += '.c4'
+    return name
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..0303a65
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,642 @@
+[[package]]
+category = "main"
+description = "Modern password hashing for your software and your servers"
+name = "bcrypt"
+optional = false
+python-versions = ">=3.6"
+version = "3.2.0"
+
+[package.dependencies]
+cffi = ">=1.1"
+six = ">=1.4.1"
+
+[package.extras]
+tests = ["pytest (>=3.2.1,<3.3.0 || >3.3.0)"]
+typecheck = ["mypy"]
+
+[[package]]
+category = "main"
+description = "Extensible memoizing collections and decorators"
+name = "cachetools"
+optional = false
+python-versions = "~=3.5"
+version = "4.1.1"
+
+[[package]]
+category = "main"
+description = "Python package for providing Mozilla's CA Bundle."
+name = "certifi"
+optional = false
+python-versions = "*"
+version = "2020.6.20"
+
+[[package]]
+category = "main"
+description = "Foreign Function Interface for Python calling C code."
+name = "cffi"
+optional = false
+python-versions = "*"
+version = "1.14.3"
+
+[package.dependencies]
+pycparser = "*"
+
+[[package]]
+category = "main"
+description = "Universal encoding detector for Python 2 and 3"
+name = "chardet"
+optional = false
+python-versions = "*"
+version = "3.0.4"
+
+[[package]]
+category = "main"
+description = "Composable command line interface toolkit"
+name = "click"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "7.1.2"
+
+[[package]]
+category = "main"
+description = "A simple framework for building complex web applications."
+name = "flask"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "1.1.2"
+
+[package.dependencies]
+Jinja2 = ">=2.10.1"
+Werkzeug = ">=0.15"
+click = ">=5.1"
+itsdangerous = ">=0.24"
+
+[package.extras]
+dev = ["pytest", "coverage", "tox", "sphinx", "pallets-sphinx-themes", "sphinxcontrib-log-cabinet", "sphinx-issues"]
+docs = ["sphinx", "pallets-sphinx-themes", "sphinxcontrib-log-cabinet", "sphinx-issues"]
+dotenv = ["python-dotenv"]
+
+[[package]]
+category = "main"
+description = "Rate limiting for flask applications"
+name = "flask-limiter"
+optional = false
+python-versions = "*"
+version = "1.4"
+
+[package.dependencies]
+Flask = ">=0.8"
+limits = "*"
+six = ">=1.4.1"
+
+[[package]]
+category = "main"
+description = "Google API client core library"
+name = "google-api-core"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+version = "1.22.4"
+
+[package.dependencies]
+google-auth = ">=1.21.1,<2.0dev"
+googleapis-common-protos = ">=1.6.0,<2.0dev"
+protobuf = ">=3.12.0"
+pytz = "*"
+requests = ">=2.18.0,<3.0.0dev"
+setuptools = ">=34.0.0"
+six = ">=1.13.0"
+
+[package.extras]
+grpc = ["grpcio (>=1.29.0,<2.0dev)"]
+grpcgcp = ["grpcio-gcp (>=0.2.2)"]
+grpcio-gcp = ["grpcio-gcp (>=0.2.2)"]
+
+[[package]]
+category = "main"
+description = "Google API Client Library for Python"
+name = "google-api-python-client"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+version = "1.12.3"
+
+[package.dependencies]
+google-api-core = ">=1.21.0,<2dev"
+google-auth = ">=1.16.0"
+google-auth-httplib2 = ">=0.0.3"
+httplib2 = ">=0.15.0,<1dev"
+six = ">=1.13.0,<2dev"
+uritemplate = ">=3.0.0,<4dev"
+
+[[package]]
+category = "main"
+description = "Google Authentication Library"
+name = "google-auth"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+version = "1.22.1"
+
+[package.dependencies]
+cachetools = ">=2.0.0,<5.0"
+pyasn1-modules = ">=0.2.1"
+setuptools = ">=40.3.0"
+six = ">=1.9.0"
+
+[package.dependencies.rsa]
+python = ">=3.5"
+version = ">=3.1.4,<5"
+
+[package.extras]
+aiohttp = ["aiohttp (>=3.6.2,<4.0.0dev)"]
+
+[[package]]
+category = "main"
+description = "Google Authentication Library: httplib2 transport"
+name = "google-auth-httplib2"
+optional = false
+python-versions = "*"
+version = "0.0.4"
+
+[package.dependencies]
+google-auth = "*"
+httplib2 = ">=0.9.1"
+six = "*"
+
+[[package]]
+category = "main"
+description = "Common protobufs used in Google APIs"
+name = "googleapis-common-protos"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+version = "1.52.0"
+
+[package.dependencies]
+protobuf = ">=3.6.0"
+
+[package.extras]
+grpc = ["grpcio (>=1.0.0)"]
+
+[[package]]
+category = "main"
+description = "A comprehensive HTTP client library."
+name = "httplib2"
+optional = false
+python-versions = "*"
+version = "0.18.1"
+
+[[package]]
+category = "main"
+description = "Internationalized Domain Names in Applications (IDNA)"
+name = "idna"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.10"
+
+[[package]]
+category = "main"
+description = "Various helpers to pass data to untrusted environments and back."
+name = "itsdangerous"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.1.0"
+
+[[package]]
+category = "main"
+description = "A very fast and expressive template engine."
+name = "jinja2"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.11.2"
+
+[package.dependencies]
+MarkupSafe = ">=0.23"
+
+[package.extras]
+i18n = ["Babel (>=0.8)"]
+
+[[package]]
+category = "main"
+description = "Rate limiting utilities"
+name = "limits"
+optional = false
+python-versions = "*"
+version = "1.5.1"
+
+[package.dependencies]
+six = ">=1.4.1"
+
+[[package]]
+category = "main"
+description = "Safely add untrusted strings to HTML/XML markup."
+name = "markupsafe"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+version = "1.1.1"
+
+[[package]]
+category = "main"
+description = "OAuth 2.0 client library"
+name = "oauth2client"
+optional = false
+python-versions = "*"
+version = "4.1.3"
+
+[package.dependencies]
+httplib2 = ">=0.9.1"
+pyasn1 = ">=0.1.7"
+pyasn1-modules = ">=0.0.5"
+rsa = ">=3.1.4"
+six = ">=1.6.1"
+
+[[package]]
+category = "main"
+description = "Protocol Buffers"
+name = "protobuf"
+optional = false
+python-versions = "*"
+version = "3.13.0"
+
+[package.dependencies]
+setuptools = "*"
+six = ">=1.9"
+
+[[package]]
+category = "main"
+description = "ASN.1 types and codecs"
+name = "pyasn1"
+optional = false
+python-versions = "*"
+version = "0.4.8"
+
+[[package]]
+category = "main"
+description = "A collection of ASN.1-based protocols modules."
+name = "pyasn1-modules"
+optional = false
+python-versions = "*"
+version = "0.2.8"
+
+[package.dependencies]
+pyasn1 = ">=0.4.6,<0.5.0"
+
+[[package]]
+category = "main"
+description = "C parser in Python"
+name = "pycparser"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.20"
+
+[[package]]
+category = "main"
+description = "Google Drive API made easy."
+name = "pydrive"
+optional = false
+python-versions = "*"
+version = "1.3.1"
+
+[package.dependencies]
+PyYAML = ">=3.0"
+google-api-python-client = ">=1.2"
+oauth2client = ">=4.0.0"
+
+[[package]]
+category = "main"
+description = "World timezone definitions, modern and historical"
+name = "pytz"
+optional = false
+python-versions = "*"
+version = "2020.1"
+
+[[package]]
+category = "main"
+description = "YAML parser and emitter for Python"
+name = "pyyaml"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "5.3.1"
+
+[[package]]
+category = "main"
+description = "Python HTTP for Humans."
+name = "requests"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.24.0"
+
+[package.dependencies]
+certifi = ">=2017.4.17"
+chardet = ">=3.0.2,<4"
+idna = ">=2.5,<3"
+urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
+
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diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..b1d802a
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,18 @@
+[tool.poetry]
+name = "repl_python3_C-4"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <you@example.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+flask = "^1.1.2"
+pydrive = "^1.3.1"
+bcrypt = "^3.2.0"
+flask-limiter = "^1.4"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"
diff --git a/static/C-4.exe b/static/C-4.exe
new file mode 100644
index 0000000..ae04570
Binary files /dev/null and b/static/C-4.exe differ
diff --git a/static/css/base.css b/static/css/base.css
new file mode 100644
index 0000000..974763b
--- /dev/null
+++ b/static/css/base.css
@@ -0,0 +1,68 @@
+body {
+    margin-top: 56px;
+    font-family: "Arial", sans-serif;
+}
+
+textarea {
+   resize: none;
+}
+
+legend, label {
+    text-align: left;
+}
+
+.flex {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: flex-start;
+}
+
+.flex_grow {
+    flex-basis: 100%;
+}
+
+div.load_div {
+    display: flex;
+    height: 32px;
+    align-items: center;
+}
+
+img.load_img {
+    visibility: hidden;
+    height: 75%;
+    margin-left: 8px;
+}
+
+#header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    position: absolute;
+    left: 0px;
+    top: 0px;
+    box-sizing: border-box;
+    padding: 4px;
+    height: 48px;
+    width: 100%;
+    background-color: gray;
+}
+
+#header a {
+    height: 100%;
+    border: 1px solid black;
+    border-radius: 8px;
+    transition: background-color 0.5s ease-out;
+}
+
+#header a:hover {
+    background-color: #4c4c4c;
+}
+
+#header a:active {
+    transition: background-color 0.25s ease-out;
+    background-color: #2c2c2c;
+}
+
+#header img {
+    height: 100%;
+}
\ No newline at end of file
diff --git a/static/css/create.css b/static/css/create.css
new file mode 100644
index 0000000..6d78ba5
--- /dev/null
+++ b/static/css/create.css
@@ -0,0 +1,40 @@
+#create_back {
+    min-width: 400px;
+    text-align: center;
+}
+
+#create_back > button {
+    width: 150px;
+}
+
+fieldset.create_field {
+    margin: 16px 0px 16px 0px;
+    min-width: 400px;
+    box-sizing: border-box;
+}
+
+fieldset.create_field > fieldset {
+    margin: 16px 0px 16px 0px;
+    flex-basis: 100%;
+}
+
+fieldset.create_field > input {
+    flex-grow: 1;
+    margin: 4px;
+}
+
+fieldset.create_field textarea {
+    flex-grow: 1;
+    margin: 4px;
+}
+
+fieldset.create_field > fieldset > label {
+    flex-basis: 100%;
+    margin-bottom: 4px;
+}
+
+#create_div_test > button, #create_div_image > button {
+    white-space: nowrap;
+    margin: 0px 4px 4px 4px;
+    width: 25px;
+}
diff --git a/static/css/problems.css b/static/css/problems.css
new file mode 100644
index 0000000..e81f767
--- /dev/null
+++ b/static/css/problems.css
@@ -0,0 +1,13 @@
+#problems_form {
+    min-width: 500px;
+    text-align: center;
+}
+
+#problems_form > button {
+    width: 150px;
+}
+
+button.problems_btn {
+    margin: 4px;
+    width: 75px;
+}
\ No newline at end of file
diff --git a/static/img/favicon.ico b/static/img/favicon.ico
new file mode 100644
index 0000000..c5a267d
Binary files /dev/null and b/static/img/favicon.ico differ
diff --git a/static/img/key.png b/static/img/key.png
new file mode 100644
index 0000000..d441129
Binary files /dev/null and b/static/img/key.png differ
diff --git a/static/img/load.gif b/static/img/load.gif
new file mode 100644
index 0000000..a2e45f5
Binary files /dev/null and b/static/img/load.gif differ
diff --git a/static/img/lock.png b/static/img/lock.png
new file mode 100644
index 0000000..1f3842a
Binary files /dev/null and b/static/img/lock.png differ
diff --git a/static/js/create.js b/static/js/create.js
new file mode 100644
index 0000000..ae6f5da
--- /dev/null
+++ b/static/js/create.js
@@ -0,0 +1,161 @@
+function add_field(type, count=1, values=[])
+{
+    if(typeof this.counts === 'undefined')
+    {
+        this.counts = {};
+    }
+    const types = {
+        'test': 
+`           
+            <legend>Test #</legend>
+            <label class="flex_grow">
+                <input name="visible_#" type="hidden" value="$"><input type="checkbox">Visible
+            </label>
+            <textarea name="input_#" placeholder="Input" wrap="off" rows=5 maxlength=1048576>$</textarea>
+            <textarea name="output_#" placeholder="Output" wrap="off" rows=5 maxlength=1048576>$</textarea>
+`,
+        'image':
+`
+            <legend>Image #</legend>
+            <label class="flex-grow"><input name="filename_img_#" type="text" placeholder="Filename" value="$"></label>
+            <input name="img_#" type="file" accept="image/*">
+`};
+    const maxes = {'test': 25, 'image': 10};
+    const sender = document.getElementById('create_div_' + type);
+    if(!this.counts.hasOwnProperty(type))
+    {
+        this.counts[type] = 0;
+    }
+    for(var i = 0; i < count; i++)
+    {
+        if(this.counts[type] >= maxes[type])
+        {
+            break;
+        }
+        var field = document.createElement('fieldset');
+        field.className = 'flex'
+        field.id = `field_${type}_${++this.counts[type]}`;
+        var inner = types[type].replace(/#/g, this.counts[type]);
+        if(i < values.length)
+        {
+            var val = values[i];
+            if(!Array.isArray(val))
+            {
+                val = [val];
+            }
+            inner = inner.split('$');
+            inner = inner.slice(1).reduce((out, current, index) => out + (index < val.length ? escape(val[index]) : '') + current, inner[0])
+        }
+        else
+        {
+            inner = inner.replace(/\$/g, '');
+        }
+        field.innerHTML = inner;
+        sender.parentNode.insertBefore(field, sender); 
+    }
+    for(var i = 0; i < -count; i++)
+    {
+        if(this.counts[type] <= 0)
+        {
+            break;
+        }
+        var del = document.getElementById(`field_${type}_${this.counts[type]--}`);
+        del.parentNode.removeChild(del);
+    }
+    setup();
+}
+
+function setup()
+{
+    [...document.querySelectorAll('input[name^=filename]')].forEach(elem => {
+        elem.oninput = checkFilename;
+        elem.pattern = '[a-z0-9-_]+';
+        elem.value = filenamify(elem.value, false);
+    });
+    [...document.querySelectorAll('input[type=file]')].forEach(elem => {
+        elem.onchange = checkFile;
+    });
+    [...document.querySelectorAll('input[type=checkbox]')].forEach(elem => {
+        elem.checked = elem.previousSibling.value == '1';
+        elem.onclick = toggle;
+    });
+    document.querySelector('#create_form').onsubmit = upload;
+}
+
+function checkFilename(e)
+{
+    e = e || window.event;
+    var sender = e.srcElement || e.target;
+    var pos = sender.selectionStart;
+    var substring = sender.value.substring(0, sender.selectionStart);
+    sender.value = filenamify(sender.value, false);
+    sender.selectionEnd = pos - substring.length + filenamify(substring, false).length;
+}
+
+function checkFile(e)
+{
+    e = e || window.event;
+    var sender = e.srcElement || e.target;
+    var target = sender.previousElementSibling.firstElementChild
+    if(sender.files[0].size > 1024 * 1024 * 5)
+    {
+        alert('Image size cannot exceed 5MB.')
+        sender.value = '';
+    }
+    target.value = filenamify(sender.files[0].name, true);
+}
+
+function toggle(e)
+{
+    e = e || window.event;
+    var sender = e.srcElement || e.target;
+    sender.previousSibling.value = 1 - sender.previousSibling.value;
+}
+
+function filenamify(str, extension)
+{
+    const remove = extension ? /\.[^.]*$|[^a-z0-9-_]/g : /[^a-z0-9-_]/g; 
+    const disallowed = 'CON PRN AUX CLOCK NUL COM1 COM2 COM3 COM4 COM5 COM6 COM7 COM8 COM9 LPT1 LPT2 LPT3 LPT4 LPT5 LPT6 LPT7 LPT8 LPT9'.split(' ');
+    str = str.toLowerCase().replace(/\s/g, '_').replace(remove, '');
+    if(disallowed.includes(str.toUpperCase()))
+    {
+        str += '_';
+    }
+    if(str.length > 32)
+    {
+        str = str.substring(0, 32);
+    }
+    return str;
+}
+
+function upload(e)
+{
+    e = e || window.event;
+    var sender = e.srcElement || e.target;
+    if(sender.checkValidity())
+    {
+        e.preventDefault();
+        
+        var form = new FormData(sender);
+        sender.querySelector('input[type=submit]').disabled = true;
+        sender.querySelector('img.load_img').style.visibility = 'visible';
+        fetch('/problems/' + (new URLSearchParams(window.location.search).get('edit') || form.get('filename')), {method: 'POST', body: form}).then(x => x.json()).then(x => {
+            if(x['ok'])
+            {
+                window.location.href = '/problems';
+            }
+            else
+            {
+                sender.querySelector('img.load_img').style.visibility = 'hidden';
+                alert(x['message']);
+                sender.querySelector('input[type=submit]').disabled = false;
+            }
+        });
+    }
+}
+
+function escape(string) {
+    return String(string).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#039;');
+}
+
+window.onload = setup;
\ No newline at end of file
diff --git a/static/js/login.js b/static/js/login.js
new file mode 100644
index 0000000..6175748
--- /dev/null
+++ b/static/js/login.js
@@ -0,0 +1,27 @@
+function login(e)
+{
+    e = e || window.event;
+    var sender = e.srcElement || e.target;
+    e.preventDefault();
+    sender.querySelector('input[type=submit]').disabled = true;
+    sender.querySelector('img.load_img').style.visibility = 'visible';
+    fetch('/login', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify({'password': document.getElementById('password').value})}).then(x => x.json()).then(x => {
+        if(x['ok'])
+        {
+            window.location.href = new URLSearchParams(window.location.search).get('next') || '/';
+        }
+        else
+        {
+            sender.querySelector('img.load_img').style.visibility = 'hidden';
+            alert(x['message']);
+            sender.querySelector('input[type=submit]').disabled = false;
+        }
+    });
+}
+
+function setup()
+{
+    document.querySelector('#login_form').onsubmit = login;
+}
+
+window.onload = setup;
\ No newline at end of file
diff --git a/static/js/problems.js b/static/js/problems.js
new file mode 100644
index 0000000..9e8384a
--- /dev/null
+++ b/static/js/problems.js
@@ -0,0 +1,45 @@
+function deleteProblem(problem)
+{
+    return function(e)
+    {
+        e = e || window.event;
+        var sender = e.srcElement || e.target;
+        if(confirm(`Are you sure you want to delete the problem "${problem}"?`))
+        {
+            var del = false;
+            sender.disabled = true;
+            sender.parentNode.querySelector('img.load_img').style.visibility = 'visible';
+            fetch('/problems/' + problem, {method: 'DELETE'}).then(x => {
+                del = x.status == 200 || x.status == 404;
+                return x.json();
+            }).then(x => {
+                if(!x['ok'])
+                {
+                    alert(x['message']);
+                }
+                if(del)
+                {
+                    var elem = document.getElementById('problems_field_' + problem)
+                    if(elem)
+                    {
+                        elem.parentNode.removeChild(elem);
+                    }
+                }
+                else
+                {
+                    sender.parentNode.querySelector('img.load_img').style.visibility = 'hidden';
+                    sender.disabled = false;
+                }
+            });
+        }
+    };
+}
+
+function setup()
+{
+    [...document.querySelectorAll('button.problems_btn[name=delete]')].forEach(elem => {
+        elem.onclick = deleteProblem(elem.value);
+    });
+}
+
+window.onload = setup
\ No newline at end of file
diff --git a/templates/base.html b/templates/base.html
new file mode 100644
index 0000000..13de56b
--- /dev/null
+++ b/templates/base.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+    <head land="en">
+        <title>Carver Coding Club Computer</title>
+        <link rel="stylesheet" type="text/css" href="{{url_for('static', filename='css/base.css')}}">
+{%- if self.css() -%}
+    {%- for file in self.css().split('/') %}
+        <link rel="stylesheet" type="text/css" href="{{url_for('static', filename='css/' + file)}}">
+    {%- endfor -%}
+{%- endif -%}{%- if self.js() -%}
+    {%- for file in self.js().split('/') %}
+        <script src="{{url_for('static', filename='js/' + file)}}"></script>
+    {%- endfor -%}
+{%- endif %}
+    </head>
+    <body>
+        <div id="header">
+            <a href="{{url_for('route_index')}}"><img src="{{url_for('route_favicon')}}" alt="C-4" draggable=false></a>
+            <a href="{{url_for('route_logout' if is_auth()['ok'] else 'route_login')}}"><img src="{{url_for('static', filename='img/' + ('lock.png' if is_auth()['ok'] else 'key.png'))}}" alt="{{'login' if is_auth()['ok'] else 'logout'}}" draggable=false></a>
+        </div>
+        {% block body %}{% endblock %}
+    </body>
+</html>
\ No newline at end of file
diff --git a/templates/create.html b/templates/create.html
new file mode 100644
index 0000000..3e18316
--- /dev/null
+++ b/templates/create.html
@@ -0,0 +1,39 @@
+{% extends 'base.html' %}
+{% block css %}create.css{% endblock %}
+{% block js %}create.js{% endblock %}
+{% block body %}
+{% set edit = problem is not none -%}
+<form id="create_back" action="{{url_for('route_problems')}}">
+    <button>Return to problem list</button>
+</form>
+<form id="create_form">
+    <fieldset class="create_field flex">
+        <legend>Metadata</legend>
+        <input type="text" name="name" placeholder="Name" maxlength=32 value="{{problem.name if edit}}" required>
+        <input name="filename" type="text" placeholder="Filename" value="{{filename if edit}}" required>
+        <textarea class="flex_grow" name="text" placeholder="Text" rows=20 maxlength=1048576 required>{{problem.text if edit}}</textarea>
+    </fieldset>
+    <fieldset class="create_field flex">
+        <legend>Tests</legend>
+        <div id="create_div_test">
+            <button type="button" onclick="add_field('test', 1)">&plus;</button><button type="button" onclick="add_field('test', -1)">&minus;</button>
+        </div>
+    </fieldset>
+    <fieldset class="create_field flex">
+        <legend>Images</legend>
+        <div id="create_div_image">
+            <button type="button" onclick="add_field('image', 1)">&plus;</button><button type="button" onclick="add_field('image', -1)">&minus;</button>
+        </div>
+    </fieldset>
+    <div class="load_div">
+        <input type="submit" value="UPLOAD">
+        <img class="load_img" src="{{url_for('static', filename='img/load.gif')}}" alt="Loading...">
+    </div>
+    {%- if edit %}
+    <script>
+        add_field('test', {{problem.tests | length}}, {{problem.tests | safe}});
+        add_field('image', {{problem.images | length}}, {{problem.images | safe}});
+    </script>
+    {%- endif %}
+</form>
+{% endblock %}
\ No newline at end of file
diff --git a/templates/index.html b/templates/index.html
new file mode 100644
index 0000000..0bb4b9b
--- /dev/null
+++ b/templates/index.html
@@ -0,0 +1,13 @@
+{% extends 'base.html' %}
+{% block css %}{% endblock %}
+{% block js %}{% endblock %}
+{% block body %}
+<p>
+    The Carver Coding Club Computer, or C-4, is an application designed to facilitate the creation and distribution of competitive programming problems. You can download it <a href="{{url_for('static', filename='C-4.exe')}}">here</a>.
+</p>
+{%- if is_auth()['ok'] %}
+<p>
+    Click <a href="{{url_for('route_problems')}}">here</a> to manage the problem list and <a href="{{url_for('route_create')}}">here</a> to upload a new problem.  
+</p>
+{%- endif %}
+{% endblock %}
\ No newline at end of file
diff --git a/templates/login.html b/templates/login.html
new file mode 100644
index 0000000..ccf30df
--- /dev/null
+++ b/templates/login.html
@@ -0,0 +1,13 @@
+{% extends 'base.html' %}
+{% block css %}{% endblock %}
+{% block js %}login.js{% endblock %}
+{% block body %}
+<form id="login_form">
+    Accessing this page requires authorization:
+    <input type="password" id="password" name="password" placeholder="Password" required>
+    <div class="load_div">
+        <input type="submit" value="LOG IN">
+        <img class="load_img" src="{{url_for('static', filename='img/load.gif')}}" alt="Loading...">
+    </div>
+</form>
+{% endblock %}
\ No newline at end of file
diff --git a/templates/logout.html b/templates/logout.html
new file mode 100644
index 0000000..9f8a3d4
--- /dev/null
+++ b/templates/logout.html
@@ -0,0 +1,8 @@
+{% extends 'base.html' %}
+{% block css %}{% endblock %}
+{% block js %}{% endblock %}
+{% block body %}
+<div>
+    You have successfully been logged out.
+</div>
+{% endblock %}
\ No newline at end of file
diff --git a/templates/problems.html b/templates/problems.html
new file mode 100644
index 0000000..8a5d41b
--- /dev/null
+++ b/templates/problems.html
@@ -0,0 +1,21 @@
+{% extends 'base.html' %}
+{% block css %}problems.css{% endblock %}
+{% block js %}problems.js{% endblock %}
+{% block body %}
+<form id="problems_form" action="{{url_for('route_create')}}">
+    <button>Create new problem</button>
+    <fieldset>
+        <legend>Problems</legend>
+        {%for problem in problems%}
+        <fieldset id="problems_field_{{problem}}" class="flex">
+            <legend>{{problem}}</legend>
+            <div class="load_div">
+                <button class="problems_btn" name="edit" value="{{problem}}">Edit</button>
+                <button class="problems_btn" type="button" name="delete" value="{{problem}}">Delete</Button>
+                <img class="load_img" src="{{url_for('static', filename='img/load.gif')}}" alt="Loading...">
+            </div>
+        </fieldset>
+        {%endfor%}
+    </fieldset>
+</form>
+{% endblock %}
\ No newline at end of file