chore(): Updates code to run on latest python

* Updates setup.py to use the markdown file
* Replaces load() with safe_load()

.gitignore

@@ -1,3 +1,5 @@
 .eggs/
 *.egg-info
 __pycache__/
+.mypy*/
+.vscode/

LICENSE

@@ -0,0 +1,25 @@
+BSD 2-Clause License
+
+Copyright (c) 2019, Elia El Lazkani
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -0,0 +1,22 @@
+# Shortenit
+
+Shortenit is a tool to shorten urls.
+
+**NOTE**: This is a very early draft project. Contributions are welcome.
+
+## Running
+
+To run `shortenit`, first we need to have a running database. Shortenit uses [CouchDB](https://couchdb.apache.org/) as a database. CouchDB can run as a docker container.
+
+```text
+$ docker run -p 5984:5984 -d couchdb 
+```
+
+At this point, visit the local instance link [http://localhost:5984](http://localhost:5984/) and create the user credentials configured in [config/config.yaml](config/config.yaml).
+
+Once the database is up and running and the credentials have been created, shortenit can be ran.
+
+```text
+$ pip install -e .
+$ shortenit
+```

README.rst

@@ -1,6 +0,0 @@
-shortenit
-=========
-
-shortenit is a tool to shorten urls.
-
-NOTE: This is a very early draft project. Contributions are welcome.

TODO

@@ -0,0 +1,10 @@
+This list is incomplete, these are a few of the things that need to be done.
+
+TODO:
+* Documentation/Code comments
+* Proper type-setting across the board
+* PEP8
+* Refactor code
+* Dockerize
+* favicon.ico is being injected into the database (need fix)
+* Fix YAML warning on startup.

config/config.yaml

@@ -5,3 +5,10 @@ CouchDB:
   username: root
   password: root
   url: http://localhost:5984
+Shortener:
+  # *CAUTION*: Enabling this check if the ID already exists before returning it.
+  # Even though this guarantees that the ID doesn't exist, this might inflict
+  # some performance hit.
+  check_duplicate_id: False
+  id_length: 32
+  id_upper_case: False

requirements/development.txt

@@ -1,2 +1,4 @@
 -r requirements.txt
 setuptools-git
+setuptools-git-version
+mypy

setup.py

@@ -4,7 +4,7 @@ from setuptools import setup
 #<link rel=stylesheet type=text/css href="{{ url('static', filename='css/custom.css') }}">
 here = Path(__file__).absolute().parent
 
-with open(str(here.joinpath('README.rst')), encoding='utf-8') as f:
+with open(str(here.joinpath('README.md')), encoding='utf-8') as f:
     long_description = f.read()
 
 with open(str(here.joinpath('requirements/requirements.txt')),
@@ -16,7 +16,7 @@ description = 'Shortenit will shorten that url for you'
 setup(
     name='shortenit',
     exclude_package_data={'': ['.gitignore', 'requirements/', 'setup.py']},
-    version_format='{tag}_{gitsha}',
+    version_format='{gitsha}',
     setup_requires=['setuptools-git', 'setuptools-git-version'],
     license='BSD',
     author='Elia El Lazkani',
@@ -40,6 +40,7 @@ setup(
         'Programming Language :: Python',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.10',
         'Environment :: Console',
         'Intended Audience :: Information Technology',
         'Intended Audience :: System Administrators'

shortenit/config.py

@@ -2,21 +2,44 @@ import yaml
 
 
 class Config:
+    """
+    Configuration importer.
+    """
     def __init__(self, config_path: str):
+        """
+        Initialize the configuration importer.
+
+        :param config_path: The path of the configuration file.
+        """
         self.config_path = config_path
         self.config = None
 
-    def get_config(self):
+    def get_config(self) -> str:
+        """
+        Get the configuration saved in the configuration file.
+
+        :returns: The configuration saved in the configuration file.
+        """
         if not self.config:
             _config = self.load_config()
             self.config = _config
         return self.config
 
-    def load_config(self):
+    def load_config(self) -> str:
+        """
+        Read the configuration saved in the configuration file.
+
+        :returns: The configuration saved in the configruation file.
+        """
         with open(self.config_path, 'rt') as f:
-            config = yaml.load(f)
+            config = yaml.safe_load(f)
             if self.validate_config(config):
                 return config
 
-    def validate_config(self, config):
+    def validate_config(self, config: str) -> bool:
+        """
+        Validate the configuration.
+
+        :returns: Configuration validation status.
+        """
         return True

shortenit/counter.py

@@ -1,29 +0,0 @@
-import logging
-
-from cloudant.document import Document
-
-
-class Counter:
-    def __init__(self, counter_db):
-        self.logger = logging.getLogger(self.__class__.__name__)
-        self.counter_db = counter_db
-        self.counter = None
-
-    def get_counter(self) -> int:
-        with Document(self.counter_db, 'counter') as counter:
-            self.logger.debug("Counter: %s", counter)
-            try:
-                self.counter = counter['value']
-            except KeyError:
-                self.logger.warn(
-                    "Counter was not initialized, initializing...")
-                counter['value'] = 0
-            try:
-                counter['value'] += 1
-            except Exception as e:
-                self.logger.err(e)
-            # Need to check if the value exists or not as to not jump values
-            # which it currently does but it's not a big issue for right now
-            self.counter = counter['value']
-
-        return self.counter

shortenit/data.py

@@ -1,3 +1,4 @@
+import typing
 import time
 import logging
 
@@ -6,9 +7,19 @@ from cloudant.document import Document
 
 
 class Data:
+    """
+    Data object.
+    """
     def __init__(self, data_db: object,
                  identifier: str = None,
-                 data: str = None):
+                 data: str = None) -> typing.NoReturn:
+        """
+        Initialize the Data object.
+
+        :param data_db: The Data database object.
+        :param identifier: A uniquely generated ID identifying the data object.
+        :param data: The data to save.
+        """
         self.logger = logging.getLogger(self.__class__.__name__)
         self.data_db = data_db
         self.identifier = identifier
@@ -18,11 +29,19 @@ class Data:
         self.data_found = None
         self.populate()
 
-    def generate_identifier(self):
+    def generate_identifier(self) -> typing.NoReturn:
+        """
+        Method to generate and save a new unique ID as the Data object identifier.
+        """
         hash_object = sha256(self.data.encode('utf-8'))
         self.identifier = hash_object.hexdigest()
 
-    def populate(self, pointer: str = None):
+    def populate(self, pointer: str = None) -> typing.NoReturn:
+        """
+        Method to populate the Data object fields with proper data and save it in the database.
+
+        :param pointer: The unique ID of the pointer object to save with the data.
+        """
         if self.identifier:
             self.logger.debug("The identifier is set, retrieving data...")
             self.get_data()
@@ -37,7 +56,10 @@ class Data:
                                   "creating...")
                 self.set_data(pointer)
 
-    def get_data(self):
+    def get_data(self) -> typing.NoReturn:
+        """
+        Method to retrieve the Data ojbect from the database.
+        """
         with Document(self.data_db, self.identifier) as data:
             try:
                 self.data = data['value']
@@ -47,7 +69,10 @@ class Data:
             except KeyError:
                 self.data_found = False
 
-    def set_data(self, pointer):
+    def set_data(self, pointer: str) -> typing.NoReturn:
+        """
+        Method to save Data object to the database.
+        """
         with Document(self.data_db, self.identifier) as data:
             data['value'] = self.data
             data['timestamp'] = self.timestamp

shortenit/db.py

@@ -1,10 +1,21 @@
+import typing
 import logging
+import requests
 
 from cloudant.client import CouchDB
 
+from shortenit.exceptions import DBConnectionFailed
 
 class DB:
-    def __init__(self, config: dict) -> None:
+    """
+    Database object class
+    """
+    def __init__(self, config: dict) -> typing.NoReturn:
+        """
+        Initialize the Database object.
+
+        :param config: The Database configuration.
+        """
         self.logger = logging.getLogger(self.__class__.__name__)
         self.username = config['username']
         self.password = config['password']
@@ -12,17 +23,12 @@ class DB:
         self.client = None
         self.session = None
 
-    def initialize_shortenit(self):
-        try:
-            self.counter_db = self.client['counter']
-        except KeyError:
-            self.logger.warn(
-                "The 'counter' database was not found, creating...")
-            self.counter_db = self.client.create_database('counter')
-            if self.counter_db.exists():
-                self.logger.info(
-                    "The 'counter' database was successfully created.")
-
+    def initialize_shortenit(self) -> typing.NoReturn:
+        """
+        Method to initialize the database for shortenit.
+        This will check if all the needed tables already exist in the database.
+        Otherwise, it will create the database tables.
+        """
         try:
             self.data_db = self.client['data']
         except KeyError:
@@ -45,13 +51,26 @@ class DB:
 
     def __enter__(self) -> CouchDB:
         """
+        Method used when entering the database context.
+
+        :returns: The CouchDB object.
         """
-        self.client = CouchDB(self.username, self.password,
-                              url=self.url, connect=True)
+        try:
+            self.client = CouchDB(self.username, self.password,
+                                  url=self.url, connect=True)
+        except requests.exceptions.ConnectionError as e:
+            self.logger.fatal("Failed to connect to database, is it on?")
+            self.logger.fatal("%s", e)
+            raise DBConnectionFailed
+        except requests.exceptions.HTTPError as e:
+            self.logger.fatal("Failed to authenticate to database.")
+            self.logger.fatal("%s", e)
+            raise DBConnectionFailed
         self.session = self.client.session()
         return self
 
-    def __exit__(self, *args) -> None:
+    def __exit__(self, *args) -> typing.NoReturn:
         """
+        Method used when exiting the database context.
         """
         self.client.disconnect()

shortenit/exceptions.py

@@ -0,0 +1,7 @@
+import sys
+
+class DBConnectionFailed(Exception):
+    """
+    DBConnectionFailed class exception.
+    """
+    pass

shortenit/logger.py

@@ -1,4 +1,5 @@
 import os
+import typing
 import yaml
 import logging.config
 from .common import check_file
@@ -6,7 +7,7 @@ from .common import check_file
 
 def setup_logging(default_path: str = None,
                   default_level: int = logging.ERROR,
-                  env_key: str = 'LOG_CFG') -> None:
+                  env_key: str = 'LOG_CFG') -> typing.NoReturn:
     """
     Method that sets the logging system up.
 

shortenit/main.py

@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+import sys
+import typing
 import argparse
 import logging
 import pathlib
@@ -6,13 +8,14 @@ import asyncio
 
 import time
 
-from .data import Data
-from .pointer import Pointer
-from .config import Config
-from .counter import Counter
-from .db import DB
-from .logger import setup_logging
-from .web import Web, SiteHandler
+from shortenit.data import Data
+from shortenit.pointer import Pointer
+from shortenit.config import Config
+from shortenit.shortener import Shortener
+from shortenit.db import DB
+from shortenit.logger import setup_logging
+from shortenit.web import Web, SiteHandler
+from shortenit.exceptions import DBConnectionFailed
 
 PROJECT_ROOT = pathlib.Path(__file__).parent.parent
 CONFIGURATION = f'{PROJECT_ROOT}/config/config.yaml'
@@ -21,7 +24,7 @@ CONFIGURATION = f'{PROJECT_ROOT}/config/config.yaml'
 logger = logging.getLogger(__name__)
 
 
-def main() -> None:
+def main() -> typing.NoReturn:
     """
     Main method
     """
@@ -34,28 +37,34 @@ def main() -> None:
     db_config = config.get('CouchDB', None)
     server_config = config.get('Server', None)
     if db_config:
-        with DB(db_config) as db:
-            db.initialize_shortenit()
+        try:
+            with DB(db_config) as db:
+                db.initialize_shortenit()
 
-            handler = SiteHandler(db, shorten_url, lenghten_url)
-            web = Web(handler, debug=debug)
-            web.host = server_config.get('host', None)
-            web.port = server_config.get('port', None)
-            web.start_up()
+                handler = SiteHandler(config, db, shorten_url, lenghten_url)
+                web = Web(handler, debug=debug)
+                web.host = server_config.get('host', None)
+                web.port = server_config.get('port', None)
+                web.start_up()
+        except DBConnectionFailed as e:
+            sys.exit(1)
+    sys.exit(0)
 
 
-def shorten_url(database: DB, data: str, ttl: time.time):
-    counter = Counter(database.counter_db)
-    data = Data(database.data_db,
-                data=data)
-    data.populate()
-    pointer = Pointer(database.pointers_db, counter)
-    pointer.generate_pointer(
-        data.identifier,
-        ttl
-        )
-    data.set_data(pointer.identifier)
-    return pointer.identifier
+def shorten_url(configuration: dict, database: DB,
+                data: str, ttl):
+    shortener = Shortener(database.pointers_db, 
+        configuration.get('Shortener', None))
+    identifier = shortener.get_id()
+    if identifier:
+        _data = Data(database.data_db,
+                    data=data)
+        _data.populate()
+        pointer = Pointer(database.pointers_db, identifier)
+        pointer.generate_pointer(_data.identifier, ttl)
+        _data.set_data(pointer.identifier)
+        return pointer.identifier
+    return None
 
 
 def lenghten_url(database: DB, identifier: str):
@@ -100,3 +109,7 @@ def verbosity(verbose: int):
         return logging.INFO
     elif verbose > 2:
         return logging.DEBUG
+
+
+if __name__ == '__main__':
+    main()

shortenit/pointer.py

@@ -1,29 +1,40 @@
+from __future__ import annotations
+
 import time
+import typing
 import logging
 
-from .counter import Counter
 from cloudant.document import Document
 
-CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
-
 
 class Pointer:
+    """
+    Pointer object.
+    """
     def __init__(self, pointers_db: object,
-                 counter: Counter = None) -> None:
+                 identifier: str = None) -> typing.NoReturn:
+        """
+        Initialize the Pointer object.
+
+        :param pointers_db: The Pointer database object.
+        :param identifier: A uniquely generated ID identifying the pointer object.
+        """
         self.logger = logging.getLogger(self.__class__.__name__)
         self.pointers_db = pointers_db
-        self.counter = counter
-        self.identifier = None
+        self.identifier = identifier
         self.data_hash = None
         self.ttl = None
         self.timestamp = time.time()
 
-    def generate_pointer(self, data_hash: str, ttl: time.time):
-        self.logger.debug("Generating new counter...")
-        counter = self.counter.get_counter()
-        self.logger.debug("Encoding the counter into an ID")
-        self.identifier = Pointer.encode(counter)
-        self.logger.debug("Encoded counter is %s", self.identifier)
+    def generate_pointer(self, data_hash: str, ttl: time.time) -> Pointer:
+        """
+        Generates a pointer object and saves it into the database.
+
+        :param data_hash: A uniquely generated ID identifying the data object.
+        :param ttl: The "Time to Live" of the pointer.
+        :returns: The Pointer object.
+        """
+        self.logger.debug("identifier is %s", self.identifier)
         with Document(self.pointers_db, self.identifier) as pointer:
             pointer['value'] = data_hash
             pointer['ttl'] = ttl
@@ -32,7 +43,13 @@ class Pointer:
             self.ttl = ttl
         return self
 
-    def get_pointer(self, identifier: str):
+    def get_pointer(self, identifier: str) -> Pointer:
+        """
+        Retrieve a pointer object from the database.
+
+        :param identifier: A uniquely generated ID identifying the Pointer object.
+        :returns: The Pointer object requested.
+        """
         with Document(self.pointers_db, identifier) as pointer:
             try:
                 self.identifier = pointer['_id']
@@ -43,25 +60,3 @@ class Pointer:
             except KeyError:
                 pass
         return None
-
-    @staticmethod
-    def encode(counter):
-        sign = '-' if counter < 0 else ''
-        counter = abs(counter)
-        result = ''
-        while counter > 0:
-            counter, remainder = divmod(counter, len(CHARS))
-            result = CHARS[remainder]+result
-
-        return sign+result
-
-    @staticmethod
-    def decode(counter):
-        return int(counter, len(CHARS))
-
-    @staticmethod
-    def padding(counter: str, count: int=6):
-        if len(counter) < count:
-            pad = '0' * (count - len(counter))
-            return f"{pad}{counter}"
-        return f"{counter}"

shortenit/shortener.py

@@ -0,0 +1,88 @@
+import uuid
+import typing
+import logging
+
+from cloudant.document import Document
+
+
+class Shortener:
+    """
+    Shortener object
+    """
+    def __init__(self, pointer_db, configuration: dict) -> typing.NoReturn:
+        """
+        Initialize the Shortener object.
+
+        :param pointer_db: The Pointer Database object.
+        :param configuration: The shortenit configuration.
+        """
+        self.logger = logging.getLogger(self.__class__.__name__)
+        self.pointer_db = pointer_db
+        self.uuid = None
+        self.length = 32
+        self.check_duplicate = False
+        self.upper_case = False
+        self.configuration = configuration
+        self.init()
+
+    def init(self) -> typing.NoReturn:
+        """
+        Initialize the shortener from the configuration.
+        """
+        length = self.configuration.get("id_length", 32)
+        if length >= 32 or length <= 0:
+            self.length = 32
+        else:
+            self.length = length
+        self.check_duplicate = self.configuration.get(
+            "check_duplicate_id", False)
+        self.upper_case = self.configuration.get(
+            "id_upper_case", False)
+
+    def generate_short_uuid(self) -> str:
+        """
+        Generate a short UUID in Hex format.
+
+        :returns: A short UUID in Hex format.
+        """
+        short_uuid = uuid.uuid1().hex
+        if self.upper_case:
+            return short_uuid.upper()[0:self.length]
+        return short_uuid.lower()[0:self.length]
+
+    def check_uuid(self, short_uuid) -> bool:
+        """
+        Check a short UUID against the database.
+
+        :returns: Whether the UUID exists in the database or not.
+        """
+        with Document(self.pointer_db, 'pointer') as pointer:
+            self.logger.debug("Pointer: %s", pointer)
+            try:
+                self.uuid = pointer[short_uuid]
+            except KeyError:
+                self.logger.info("Generated short uuid '%s'"
+                                 "was not found in database",
+                                 short_uuid)
+                return False
+            return True
+
+    def get_id(self) -> str:
+        """
+        Method to get a UUID.
+        This method will generate a UUID and checks if it already exists in the database.
+
+        :returns: A UUID.
+        """
+        short_uuid = self.generate_short_uuid()
+        if self.check_duplicate:
+            counter = 0
+            while self.check_uuid(short_uuid):
+                if counter > 10:
+                    self.logger.err("Cannot generate new unique ID,"
+                                    "try to configure a longer ID length.")
+                    return None
+                short_uuid = self.generate_short_uuid()
+                counter += 1
+        self.logger.debug("Returning ID: '%s'", short_uuid)
+        return short_uuid

shortenit/web.py

@@ -38,8 +38,9 @@ class Web:
 
 
 class SiteHandler:
-    def __init__(self, database, shorten_url, lenghten_url):
+    def __init__(self, configuration, database, shorten_url, lenghten_url):
         self.logger = logging.getLogger(self.__class__.__name__)
+        self.configuration = configuration
         self.database = database
         self.shorten_url = shorten_url
         self.lenghten_url = lenghten_url
@@ -59,7 +60,8 @@ class SiteHandler:
             abort(400)
         try:
             short_url = self.shorten_url(
-                self.database, data['url'], data['timestamp'])
+                self.configuration, self.database,
+                data['url'], data['timestamp'])
         except KeyError as e:
             self.logger.error(e)
             abort(400)