Merge main

README.md

@@ -115,6 +115,7 @@ docker-compose up -d --build
 | --frontend-language-target | Set frontend default language - target | `es`          |
 | --frontend-timeout | Set frontend translation timeout | `500`         |
 | --api-keys | Enable API keys database for per-user rate limits lookup | `Don't use API keys` |
+| --require-api-key-origin | Require use of an API key for programmatic access to the API, unless the request origin matches this domain | `No restrictions on domain origin` |
 | --load-only   | Set available languages    | `all from argostranslate`    |
 
 ## Manage API Keys
@@ -151,6 +152,7 @@ You can use the LibreTranslate API using the following bindings:
  - Node.js: https://github.com/franciscop/translate
  - .Net: https://github.com/sigaloid/LibreTranslate.Net
  - Go: https://github.com/SnakeSel/libretranslate
+ - Python: https://github.com/argosopentech/LibreTranslate-py
 
 More coming soon!
 

app/__init__.py

@@ -1,9 +1,12 @@
 import os
-from appdirs import user_data_dir
 
 # override polyglot path
 import polyglot
-polyglot.polyglot_path = os.path.join(user_data_dir(appname="LibreTranslate", appauthor="uav4geo"), "polyglot_data")
+from appdirs import user_data_dir
+
+polyglot.polyglot_path = os.path.join(
+    user_data_dir(appname="LibreTranslate", appauthor="uav4geo"), "polyglot_data"
+)
 
 
 from .main import main

app/api_keys.py

@@ -1,27 +1,33 @@
 import sqlite3
 import uuid
+
 from expiringdict import ExpiringDict
 
 DEFAULT_DB_PATH = "api_keys.db"
 
+
 class Database:
-    def __init__(self, db_path = DEFAULT_DB_PATH, max_cache_len=1000, max_cache_age=30):
+    def __init__(self, db_path=DEFAULT_DB_PATH, max_cache_len=1000, max_cache_age=30):
         self.db_path = db_path
         self.cache = ExpiringDict(max_len=max_cache_len, max_age_seconds=max_cache_age)
 
         # Make sure to do data synchronization on writes!
         self.c = sqlite3.connect(db_path, check_same_thread=False)
-        self.c.execute('''CREATE TABLE IF NOT EXISTS api_keys (
+        self.c.execute(
+            """CREATE TABLE IF NOT EXISTS api_keys (
             "api_key"	TEXT NOT NULL,
             "req_limit"	INTEGER NOT NULL,
             PRIMARY KEY("api_key")
-        );''')
+        );"""
+        )
 
     def lookup(self, api_key):
         req_limit = self.cache.get(api_key)
         if req_limit is None:
             # DB Lookup
-            stmt = self.c.execute('SELECT req_limit FROM api_keys WHERE api_key = ?', (api_key, ))
+            stmt = self.c.execute(
+                "SELECT req_limit FROM api_keys WHERE api_key = ?", (api_key,)
+            )
             row = stmt.fetchone()
             if row is not None:
                 self.cache[api_key] = row[0]
@@ -29,26 +35,29 @@ class Database:
             else:
                 self.cache[api_key] = False
                 req_limit = False
-        
+
         if isinstance(req_limit, bool):
             req_limit = None
-        
+
         return req_limit
-    
-    def add(self, req_limit, api_key = "auto"):
+
+    def add(self, req_limit, api_key="auto"):
         if api_key == "auto":
             api_key = str(uuid.uuid4())
 
         self.remove(api_key)
-        self.c.execute("INSERT INTO api_keys (api_key, req_limit) VALUES (?, ?)", (api_key, req_limit))
+        self.c.execute(
+            "INSERT INTO api_keys (api_key, req_limit) VALUES (?, ?)",
+            (api_key, req_limit),
+        )
         self.c.commit()
         return (api_key, req_limit)
-    
+
     def remove(self, api_key):
-        self.c.execute('DELETE FROM api_keys WHERE api_key = ?', (api_key, ))
+        self.c.execute("DELETE FROM api_keys WHERE api_key = ?", (api_key,))
         self.c.commit()
         return api_key
 
     def all(self):
         row = self.c.execute("SELECT api_key, req_limit FROM api_keys")
-        return row.fetchall()
+        return row.fetchall()

app/app.py

@@ -1,11 +1,15 @@
 import os
-from flask import Flask, render_template, jsonify, request, abort, send_from_directory
+from functools import wraps
+
+from flask import Flask, abort, jsonify, render_template, request
 from flask_swagger import swagger
 from flask_swagger_ui import get_swaggerui_blueprint
-from pkg_resources import resource_filename
-from .api_keys import Database
-from app.language import detect_languages, transliterate
+
 from app import flood
+from app.language import detect_languages, transliterate
+
+from .api_keys import Database
+
 
 def get_json_dict(request):
     d = request.get_json()
@@ -13,11 +17,12 @@ def get_json_dict(request):
         abort(400, description="Invalid JSON format")
     return d
 
+
 def get_remote_address():
     if request.headers.getlist("X-Forwarded-For"):
         ip = request.headers.getlist("X-Forwarded-For")[0]
     else:
-        ip = request.remote_addr or '127.0.0.1'
+        ip = request.remote_addr or "127.0.0.1"
 
     return ip
 
@@ -58,47 +63,91 @@ def get_routes_limits(default_req_limit, daily_req_limit, api_keys_db):
 
     return res
 
+
 def create_app(args):
     from app.init import boot
+
     boot(args.load_only)
 
     from app.language import languages
+
     app = Flask(__name__)
 
     if args.debug:
-        app.config['TEMPLATES_AUTO_RELOAD'] = True
+        app.config["TEMPLATES_AUTO_RELOAD"] = True
 
     # Map userdefined frontend languages to argos language object.
     if args.frontend_language_source == "auto":
-        frontend_argos_language_source = type('obj', (object,), {
-            'code': 'auto',
-            'name': 'Auto Detect'
-        })
+        frontend_argos_language_source = type(
+            "obj", (object,), {"code": "auto", "name": "Auto Detect"}
+        )
     else:
-        frontend_argos_language_source = next(iter([l for l in languages if l.code == args.frontend_language_source]), None)
+        frontend_argos_language_source = next(
+            iter([l for l in languages if l.code == args.frontend_language_source]),
+            None,
+        )
 
-    frontend_argos_language_target = next(iter([l for l in languages if l.code == args.frontend_language_target]), None)
+    frontend_argos_language_target = next(
+        iter([l for l in languages if l.code == args.frontend_language_target]), None
+    )
 
     # Raise AttributeError to prevent app startup if user input is not valid.
     if frontend_argos_language_source is None:
-        raise AttributeError(f"{args.frontend_language_source} as frontend source language is not supported.")
+        raise AttributeError(
+            f"{args.frontend_language_source} as frontend source language is not supported."
+        )
     if frontend_argos_language_target is None:
-        raise AttributeError(f"{args.frontend_language_target} as frontend target language is not supported.")
+        raise AttributeError(
+            f"{args.frontend_language_target} as frontend target language is not supported."
+        )
+
+    api_keys_db = None
 
     if args.req_limit > 0 or args.api_keys or args.daily_req_limit > 0:
+        api_keys_db = Database() if args.api_keys else None
+
         from flask_limiter import Limiter
+
         limiter = Limiter(
             app,
             key_func=get_remote_address,
-            default_limits=get_routes_limits(args.req_limit, args.daily_req_limit, Database() if args.api_keys else None)
+            default_limits=get_routes_limits(
+                args.req_limit, args.daily_req_limit, api_keys_db
+            ),
         )
     else:
-      from .no_limiter import Limiter
-      limiter = Limiter()
-    
+        from .no_limiter import Limiter
+
+        limiter = Limiter()
+
     if args.req_flood_threshold > 0:
         flood.setup(args.req_flood_threshold)
 
+    def access_check(f):
+        @wraps(f)
+        def func(*a, **kw):
+            if flood.is_banned(get_remote_address()):
+                abort(403, description="Too many request limits violations")
+
+            if args.api_keys and args.require_api_key_origin:
+                if request.is_json:
+                    json = get_json_dict(request)
+                    ak = json.get("api_key")
+                else:
+                    ak = request.values.get("api_key")
+
+                if (
+                    api_keys_db.lookup(ak) is None and request.headers.get("Origin") != args.require_api_key_origin
+                ):
+                    abort(
+                        403,
+                        description="Please contact the server operator to obtain an API key",
+                    )
+
+            return f(*a, **kw)
+
+        return func
+
     @app.errorhandler(400)
     def invalid_api(e):
         return jsonify({"error": str(e.description)}), 400
@@ -116,18 +165,23 @@ def create_app(args):
     def denied(e):
         return jsonify({"error": str(e.description)}), 403
 
-
     @app.route("/")
     @limiter.exempt
     def index():
-        return render_template('index.html', gaId=args.ga_id, frontendTimeout=args.frontend_timeout, api_keys=args.api_keys, web_version=os.environ.get('LT_WEB') is not None)
+        return render_template(
+            "index.html",
+            gaId=args.ga_id,
+            frontendTimeout=args.frontend_timeout,
+            api_keys=args.api_keys,
+            web_version=os.environ.get("LT_WEB") is not None,
+        )
 
-    @app.route("/javascript-licenses", methods=['GET'])
+    @app.route("/javascript-licenses", methods=["GET"])
     @limiter.exempt
     def javascript_licenses():
-        return render_template('javascript-licenses.html')
+        return render_template("javascript-licenses.html")
 
-    @app.route("/languages", methods=['GET', 'POST'])
+    @app.route("/languages", methods=["GET", "POST"])
     @limiter.exempt
     def langs():
         """
@@ -160,21 +214,23 @@ def create_app(args):
                   type: string
                   description: Reason for slow down
         """
-        return jsonify([{'code': l.code, 'name': l.name} for l in languages])
+        return jsonify([{"code": l.code, "name": l.name} for l in languages])
 
     # Add cors
     @app.after_request
     def after_request(response):
-        response.headers.add('Access-Control-Allow-Origin','*')
-        response.headers.add('Access-Control-Allow-Headers', "Authorization, Content-Type")
-        response.headers.add('Access-Control-Expose-Headers', "Authorization")
-        response.headers.add('Access-Control-Allow-Methods', "GET, POST")
-        response.headers.add('Access-Control-Allow-Credentials', "true")
-        response.headers.add('Access-Control-Max-Age', 60 * 60 * 24 * 20)
+        response.headers.add("Access-Control-Allow-Origin", "*")
+        response.headers.add(
+            "Access-Control-Allow-Headers", "Authorization, Content-Type"
+        )
+        response.headers.add("Access-Control-Expose-Headers", "Authorization")
+        response.headers.add("Access-Control-Allow-Methods", "GET, POST")
+        response.headers.add("Access-Control-Allow-Credentials", "true")
+        response.headers.add("Access-Control-Max-Age", 60 * 60 * 24 * 20)
         return response
 
-
-    @app.route("/translate", methods=['POST'])
+    @app.route("/translate", methods=["POST"])
+    @access_check
     def translate():
         """
         Translate text from a language to another
@@ -262,14 +318,11 @@ def create_app(args):
                   type: string
                   description: Error message
         """
-        if flood.is_banned(get_remote_address()):
-            abort(403, description="Too many request limits violations")
-
         if request.is_json:
             json = get_json_dict(request)
-            q = json.get('q')
-            source_lang = json.get('source')
-            target_lang = json.get('target')
+            q = json.get("q")
+            source_lang = json.get("source")
+            target_lang = json.get("target")
         else:
             q = request.values.get("q")
             source_lang = request.values.get("source")
@@ -285,20 +338,28 @@ def create_app(args):
         batch = isinstance(q, list)
 
         if batch and args.batch_limit != -1:
-          batch_size = len(q)
-          if args.batch_limit < batch_size:
-            abort(400, description="Invalid request: Request (%d) exceeds text limit (%d)" % (batch_size, args.batch_limit))
+            batch_size = len(q)
+            if args.batch_limit < batch_size:
+                abort(
+                    400,
+                    description="Invalid request: Request (%d) exceeds text limit (%d)"
+                    % (batch_size, args.batch_limit),
+                )
 
         if args.char_limit != -1:
             if batch:
-              chars = sum([len(text) for text in q])
+                chars = sum([len(text) for text in q])
             else:
-              chars = len(q)
+                chars = len(q)
 
             if args.char_limit < chars:
-              abort(400, description="Invalid request: Request (%d) exceeds character limit (%d)" % (chars, args.char_limit))
+                abort(
+                    400,
+                    description="Invalid request: Request (%d) exceeds character limit (%d)"
+                    % (chars, args.char_limit),
+                )
 
-        if source_lang == 'auto':
+        if source_lang == "auto":
             candidate_langs = detect_languages(q)
 
             if args.debug:
@@ -320,14 +381,30 @@ def create_app(args):
         translator = src_lang.get_translation(tgt_lang)
 
         try:
-          if batch:
-            return jsonify({"translatedText": [translator.translate(transliterate(text, target_lang=source_lang)) for text in q] })
-          else:
-            return jsonify({"translatedText": translator.translate(transliterate(q, target_lang=source_lang)) })
+            if batch:
+                return jsonify(
+                    {
+                        "translatedText": [
+                            translator.translate(
+                                transliterate(text, target_lang=source_lang)
+                            )
+                            for text in q
+                        ]
+                    }
+                )
+            else:
+                return jsonify(
+                    {
+                        "translatedText": translator.translate(
+                            transliterate(q, target_lang=source_lang)
+                        )
+                    }
+                )
         except Exception as e:
             abort(500, description="Cannot translate text: %s" % str(e))
 
-    @app.route("/detect", methods=['POST'])
+    @app.route("/detect", methods=["POST"])
+    @access_check
     def detect():
         """
         Detect the language of a single text
@@ -377,7 +454,7 @@ def create_app(args):
               properties:
                 error:
                   type: string
-                  description: Error message          
+                  description: Error message
           500:
             description: Detection error
             schema:
@@ -411,7 +488,7 @@ def create_app(args):
 
         if request.is_json:
             json = get_json_dict(request)
-            q = json.get('q')
+            q = json.get("q")
         else:
             q = request.values.get("q")
 
@@ -420,7 +497,6 @@ def create_app(args):
 
         return jsonify(detect_languages(q))
 
-
     @app.route("/frontend/settings")
     @limiter.exempt
     def frontend_settings():
@@ -464,30 +540,37 @@ def create_app(args):
                           type: string
                           description: Human-readable language name (in English)
         """
-        return jsonify({'charLimit': args.char_limit,
-                        'frontendTimeout': args.frontend_timeout,
-                        'language': {
-                            'source': {'code': frontend_argos_language_source.code, 'name': frontend_argos_language_source.name},
-                            'target': {'code': frontend_argos_language_target.code, 'name': frontend_argos_language_target.name}}
-                       })
+        return jsonify(
+            {
+                "charLimit": args.char_limit,
+                "frontendTimeout": args.frontend_timeout,
+                "language": {
+                    "source": {
+                        "code": frontend_argos_language_source.code,
+                        "name": frontend_argos_language_source.name,
+                    },
+                    "target": {
+                        "code": frontend_argos_language_target.code,
+                        "name": frontend_argos_language_target.name,
+                    },
+                },
+            }
+        )
 
     swag = swagger(app)
-    swag['info']['version'] = "1.2"
-    swag['info']['title'] = "LibreTranslate"
+    swag["info"]["version"] = "1.2"
+    swag["info"]["title"] = "LibreTranslate"
 
     @app.route("/spec")
     @limiter.exempt
     def spec():
         return jsonify(swag)
 
-    SWAGGER_URL = '/docs'  # URL for exposing Swagger UI (without trailing '/')
-    API_URL = '/spec'
+    SWAGGER_URL = "/docs"  # URL for exposing Swagger UI (without trailing '/')
+    API_URL = "/spec"
 
     # Call factory function to create our blueprint
-    swaggerui_blueprint = get_swaggerui_blueprint(
-        SWAGGER_URL,
-        API_URL
-    )
+    swaggerui_blueprint = get_swaggerui_blueprint(SWAGGER_URL, API_URL)
 
     app.register_blueprint(swaggerui_blueprint)
 

app/flood.py

@@ -1,4 +1,3 @@
-import time
 import atexit
 
 from apscheduler.schedulers.background import BackgroundScheduler
@@ -7,11 +6,13 @@ banned = {}
 active = False
 threshold = -1
 
+
 def clear_banned():
     global banned
     banned = {}
 
-def setup(violations_threshold = 100):
+
+def setup(violations_threshold=100):
     global active
     global threshold
 
@@ -31,6 +32,7 @@ def report(request_ip):
         banned[request_ip] = banned.get(request_ip, 0)
         banned[request_ip] += 1
 
+
 def is_banned(request_ip):
     # More than X offences?
     return active and banned.get(request_ip, 0) >= threshold

app/init.py

@@ -1,9 +1,10 @@
-import os
 from pathlib import Path
-from argostranslate import settings, package, translate
-import os, glob, shutil, zipfile
-import app.language
+
 import polyglot
+from argostranslate import package, translate
+
+import app.language
+
 
 def boot(load_only=None):
     try:
@@ -12,6 +13,7 @@ def boot(load_only=None):
     except Exception as e:
         print("Cannot update models (normal if you're offline): %s" % str(e))
 
+
 def check_and_install_models(force=False, load_only_lang_codes=None):
     if len(package.get_installed_packages()) < 2 or force:
         # Update package definitions from remote
@@ -29,48 +31,63 @@ def check_and_install_models(force=False, load_only_lang_codes=None):
             for pack in available_packages:
                 unavailable_lang_codes -= {pack.from_code, pack.to_code}
             if unavailable_lang_codes:
-                raise ValueError('Unavailable language codes: %s.' % ','.join(sorted(unavailable_lang_codes)))
+                raise ValueError(
+                    "Unavailable language codes: %s."
+                    % ",".join(sorted(unavailable_lang_codes))
+                )
             # Keep only the packages that have both from_code and to_code in our list.
             available_packages = [
                 pack
                 for pack in available_packages
-                if pack.from_code in load_only_lang_codes
-                and pack.to_code in load_only_lang_codes
+                if pack.from_code in load_only_lang_codes and pack.to_code in load_only_lang_codes
             ]
             if not available_packages:
-                raise ValueError('no available package')
+                raise ValueError("no available package")
             print("Keep %s models" % len(available_packages))
 
         # Download and install all available packages
         for available_package in available_packages:
-            print("Downloading %s (%s) ..." % (available_package, available_package.package_version))
+            print(
+                "Downloading %s (%s) ..."
+                % (available_package, available_package.package_version)
+            )
             download_path = available_package.download()
             package.install_from_path(download_path)
 
         # reload installed languages
         app.language.languages = translate.load_installed_languages()
-        print("Loaded support for %s languages (%s models total)!" % (len(translate.load_installed_languages()), len(available_packages)))
+        print(
+            "Loaded support for %s languages (%s models total)!"
+            % (len(translate.load_installed_languages()), len(available_packages))
+        )
 
 
 def check_and_install_transliteration(force=False):
     # 'en' is not a supported transliteration language
-    transliteration_languages = [l.code for l in app.language.languages if l.code != "en"]
+    transliteration_languages = [
+        l.code for l in app.language.languages if l.code != "en"
+    ]
 
     # check installed
     install_needed = []
     if not force:
         t_packages_path = Path(polyglot.polyglot_path) / "transliteration2"
         for lang in transliteration_languages:
-            if not (t_packages_path / lang / f"transliteration.{lang}.tar.bz2").exists():
+            if not (
+                t_packages_path / lang / f"transliteration.{lang}.tar.bz2"
+            ).exists():
                 install_needed.append(lang)
     else:
         install_needed = transliteration_languages
 
     # install the needed transliteration packages
     if install_needed:
-        print(f"Installing transliteration models for the following languages: {', '.join(install_needed)}")
+        print(
+            f"Installing transliteration models for the following languages: {', '.join(install_needed)}"
+        )
 
         from polyglot.downloader import Downloader
+
         downloader = Downloader()
 
         for lang in install_needed:

app/language.py

@@ -4,7 +4,6 @@ from argostranslate import translate
 from polyglot.detect.base import Detector, UnknownLanguage
 from polyglot.transliteration.base import Transliterator
 
-
 languages = translate.load_installed_languages()
 
 
@@ -24,24 +23,21 @@ def detect_languages(text):
     for t in text:
         try:
             candidates.extend(Detector(t).languages)
-        except UnknownLanguage as e:
+        except UnknownLanguage:
             pass
 
     # total read bytes of the provided text
     read_bytes_total = sum(c.read_bytes for c in candidates)
 
     # only use candidates that are supported by argostranslate
-    candidate_langs = list(filter(lambda l: l.read_bytes != 0 and l.code in __lang_codes, candidates))
+    candidate_langs = list(
+        filter(lambda l: l.read_bytes != 0 and l.code in __lang_codes, candidates)
+    )
 
     # this happens if no language could be detected
     if not candidate_langs:
         # use language "en" by default but with zero confidence
-        return [
-                    {
-                        'confidence': 0.0,
-                        'language': "en"
-                    }
-                ]
+        return [{"confidence": 0.0, "language": "en"}]
 
     # for multiple occurrences of the same language (can happen on batch detection)
     # calculate the average confidence for each language
@@ -65,15 +61,11 @@ def detect_languages(text):
             candidate_langs = temp_average_list
 
     # sort the candidates descending based on the detected confidence
-    candidate_langs.sort(key=lambda l: (l.confidence * l.read_bytes) / read_bytes_total, reverse=True)
+    candidate_langs.sort(
+        key=lambda l: (l.confidence * l.read_bytes) / read_bytes_total, reverse=True
+    )
 
-    return [
-                {
-                    'confidence': l.confidence,
-                    'language': l.code
-                }
-                for l in candidate_langs
-            ]
+    return [{"confidence": l.confidence, "language": l.code} for l in candidate_langs]
 
 
 def __transliterate_line(transliterator, line_text):
@@ -97,9 +89,9 @@ def __transliterate_line(transliterator, line_text):
         else:
             # add back any stripped punctuation
             if r_diff:
-                t_word = t_word + ''.join(r_diff)
+                t_word = t_word + "".join(r_diff)
             if l_diff:
-                t_word = ''.join(l_diff) + t_word
+                t_word = "".join(l_diff) + t_word
 
         new_text.append(t_word)
 

app/main.py

@@ -1,41 +1,104 @@
 import argparse
 import operator
+
 from app.app import create_app
 
+
 def main():
-    parser = argparse.ArgumentParser(description='LibreTranslate - Free and Open Source Translation API')
-    parser.add_argument('--host', type=str,
-                        help='Hostname (%(default)s)', default="127.0.0.1")
-    parser.add_argument('--port', type=int,
-                        help='Port (%(default)s)', default=5000)
-    parser.add_argument('--char-limit', default=-1, type=int, metavar="<number of characters>",
-                        help='Set character limit (%(default)s)')
-    parser.add_argument('--req-limit', default=-1, type=int, metavar="<number>",
-                        help='Set the default maximum number of requests per minute per client (%(default)s)')
-    parser.add_argument('--daily-req-limit', default=-1, type=int, metavar="<number>",
-                        help='Set the default maximum number of requests per day per client, in addition to req-limit. (%(default)s)')
-    parser.add_argument('--req-flood-threshold', default=-1, type=int, metavar="<number>",
-                        help='Set the maximum number of request limit offences per 4 weeks that a client can exceed before being banned. (%(default)s)')
-    parser.add_argument('--batch-limit', default=-1, type=int, metavar="<number of texts>",
-                        help='Set maximum number of texts to translate in a batch request (%(default)s)')
-    parser.add_argument('--ga-id', type=str, default=None, metavar="<GA ID>",
-                        help='Enable Google Analytics on the API client page by providing an ID (%(default)s)')
-    parser.add_argument('--debug', default=False, action="store_true",
-                        help="Enable debug environment")
-    parser.add_argument('--ssl', default=None, action="store_true",
-                        help="Whether to enable SSL")
-    parser.add_argument('--frontend-language-source', type=str, default="en", metavar="<language code>",
-                        help='Set frontend default language - source (%(default)s)')
-    parser.add_argument('--frontend-language-target', type=str, default="es", metavar="<language code>",
-                        help='Set frontend default language - target (%(default)s)')
-    parser.add_argument('--frontend-timeout', type=int, default=500, metavar="<milliseconds>",
-                        help='Set frontend translation timeout (%(default)s)')
-    parser.add_argument('--api-keys', default=False, action="store_true",
-                        help="Enable API keys database for per-user rate limits lookup")
-    parser.add_argument('--load-only', type=operator.methodcaller('split', ','),
-                        metavar='<comma-separated language codes>',
-                        help='Set available languages (ar,de,en,es,fr,ga,hi,it,ja,ko,pt,ru,zh)')
-    
+    parser = argparse.ArgumentParser(
+        description="LibreTranslate - Free and Open Source Translation API"
+    )
+    parser.add_argument(
+        "--host", type=str, help="Hostname (%(default)s)", default="127.0.0.1"
+    )
+    parser.add_argument("--port", type=int, help="Port (%(default)s)", default=5000)
+    parser.add_argument(
+        "--char-limit",
+        default=-1,
+        type=int,
+        metavar="<number of characters>",
+        help="Set character limit (%(default)s)",
+    )
+    parser.add_argument(
+        "--req-limit",
+        default=-1,
+        type=int,
+        metavar="<number>",
+        help="Set the default maximum number of requests per minute per client (%(default)s)",
+    )
+    parser.add_argument(
+        "--daily-req-limit",
+        default=-1,
+        type=int,
+        metavar="<number>",
+        help="Set the default maximum number of requests per day per client, in addition to req-limit. (%(default)s)",
+    )
+    parser.add_argument(
+        "--req-flood-threshold",
+        default=-1,
+        type=int,
+        metavar="<number>",
+        help="Set the maximum number of request limit offences per 4 weeks that a client can exceed before being banned. (%(default)s)",
+    )
+    parser.add_argument(
+        "--batch-limit",
+        default=-1,
+        type=int,
+        metavar="<number of texts>",
+        help="Set maximum number of texts to translate in a batch request (%(default)s)",
+    )
+    parser.add_argument(
+        "--ga-id",
+        type=str,
+        default=None,
+        metavar="<GA ID>",
+        help="Enable Google Analytics on the API client page by providing an ID (%(default)s)",
+    )
+    parser.add_argument(
+        "--debug", default=False, action="store_true", help="Enable debug environment"
+    )
+    parser.add_argument(
+        "--ssl", default=None, action="store_true", help="Whether to enable SSL"
+    )
+    parser.add_argument(
+        "--frontend-language-source",
+        type=str,
+        default="en",
+        metavar="<language code>",
+        help="Set frontend default language - source (%(default)s)",
+    )
+    parser.add_argument(
+        "--frontend-language-target",
+        type=str,
+        default="es",
+        metavar="<language code>",
+        help="Set frontend default language - target (%(default)s)",
+    )
+    parser.add_argument(
+        "--frontend-timeout",
+        type=int,
+        default=500,
+        metavar="<milliseconds>",
+        help="Set frontend translation timeout (%(default)s)",
+    )
+    parser.add_argument(
+        "--api-keys",
+        default=False,
+        action="store_true",
+        help="Enable API keys database for per-user rate limits lookup",
+    )
+    parser.add_argument(
+        "--require-api-key-origin",
+        type=str,
+        default="",
+        help="Require use of an API key for programmatic access to the API, unless the request origin matches this domain",
+    )
+    parser.add_argument(
+        "--load-only",
+        type=operator.methodcaller("split", ","),
+        metavar="<comma-separated language codes>",
+        help="Set available languages (ar,de,en,es,fr,ga,hi,it,ja,ko,pt,ru,zh)",
+    )
 
     args = parser.parse_args()
     app = create_app(args)
@@ -44,7 +107,14 @@ def main():
         app.run(host=args.host, port=args.port)
     else:
         from waitress import serve
-        serve(app, host=args.host, port=args.port, url_scheme='https' if args.ssl else 'http')
+
+        serve(
+            app,
+            host=args.host,
+            port=args.port,
+            url_scheme="https" if args.ssl else "http",
+        )
+
 
 if __name__ == "__main__":
     main()

app/manage.py

@@ -1,31 +1,35 @@
 import argparse
+
 from app.api_keys import Database
 
+
 def manage():
-    parser = argparse.ArgumentParser(description='LibreTranslate Manage Tools')
-    subparsers = parser.add_subparsers(help='', dest='command', required=True, title="Command List")
+    parser = argparse.ArgumentParser(description="LibreTranslate Manage Tools")
+    subparsers = parser.add_subparsers(
+        help="", dest="command", required=True, title="Command List"
+    )
 
-    keys_parser = subparsers.add_parser('keys', help='Manage API keys database')
-    keys_subparser = keys_parser.add_subparsers(help='', dest='sub_command', title="Command List")
+    keys_parser = subparsers.add_parser("keys", help="Manage API keys database")
+    keys_subparser = keys_parser.add_subparsers(
+        help="", dest="sub_command", title="Command List"
+    )
 
-    keys_add_parser = keys_subparser.add_parser('add', help='Add API keys to database')
-    keys_add_parser.add_argument('req_limit',
-                    type=int,
-                    help='Request Limits (per second)')
-    keys_add_parser.add_argument('--key',
-                    type=str,
-                    default="auto",
-                    required=False,
-                    help='API Key')
+    keys_add_parser = keys_subparser.add_parser("add", help="Add API keys to database")
+    keys_add_parser.add_argument(
+        "req_limit", type=int, help="Request Limits (per second)"
+    )
+    keys_add_parser.add_argument(
+        "--key", type=str, default="auto", required=False, help="API Key"
+    )
 
-    keys_remove_parser = keys_subparser.add_parser('remove', help='Remove API keys to database')
-    keys_remove_parser.add_argument('key',
-                    type=str,
-                    help='API Key')
+    keys_remove_parser = keys_subparser.add_parser(
+        "remove", help="Remove API keys to database"
+    )
+    keys_remove_parser.add_argument("key", type=str, help="API Key")
 
     args = parser.parse_args()
-    
-    if args.command == 'keys':
+
+    if args.command == "keys":
         db = Database()
         if args.sub_command is None:
             # Print keys
@@ -36,10 +40,10 @@ def manage():
                 for item in keys:
                     print("%s: %s" % item)
 
-        elif args.sub_command == 'add':
+        elif args.sub_command == "add":
             print(db.add(args.req_limit, args.key)[0])
-        elif args.sub_command == 'remove':
+        elif args.sub_command == "remove":
             print(db.remove(args.key))
     else:
         parser.print_help()
-        exit(1)
+        exit(1)

app/no_limiter.py

@@ -1,8 +1,10 @@
 from functools import wraps
 
+
 class Limiter:
-	def exempt(self, f):
-		@wraps(f)
-		def wrapper(*args, **kwargs):
-			return f(*args, **kwargs)
-		return wrapper
+    def exempt(self, f):
+        @wraps(f)
+        def wrapper(*args, **kwargs):
+            return f(*args, **kwargs)
+
+        return wrapper

install_models.py

@@ -3,5 +3,5 @@
 from app.init import check_and_install_models, check_and_install_transliteration
 
 if __name__ == "__main__":
-	check_and_install_models(force=True)
-	check_and_install_transliteration(force=True)
+    check_and_install_models(force=True)
+    check_and_install_transliteration(force=True)

setup.cfg

@@ -0,0 +1,12 @@
+[flake8]
+exclude = .git,
+        .vscode,
+        .gitignore,
+        README.md,
+        venv,
+        test,
+        setup.py,
+        app/__init__.py
+
+max-line-length = 136
+ignore = E741

tests/test_init.py

@@ -1,9 +1,9 @@
-import pytest
 from app.init import boot
 from argostranslate import package
 
+
 def test_boot_argos():
     """Test Argos translate models initialization"""
     boot()
 
-    assert len(package.get_installed_packages()) > 2
+    assert len(package.get_installed_packages()) > 2