mirror of
https://github.com/LibreTranslate/LibreTranslate.git
synced 2024-12-18 08:27:03 +02:00
596 lines
18 KiB
Python
596 lines
18 KiB
Python
import os
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from functools import wraps
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from flask import Flask, abort, jsonify, render_template, request
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from flask_swagger import swagger
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from flask_swagger_ui import get_swaggerui_blueprint
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from app import flood
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from app.language import detect_languages, transliterate
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from .api_keys import Database
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def get_json_dict(request):
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d = request.get_json()
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if not isinstance(d, dict):
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abort(400, description="Invalid JSON format")
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return d
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def get_remote_address():
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if request.headers.getlist("X-Forwarded-For"):
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ip = request.headers.getlist("X-Forwarded-For")[0]
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else:
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ip = request.remote_addr or "127.0.0.1"
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return ip
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def get_req_limits(default_limit, api_keys_db, multiplier = 1):
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req_limit = default_limit
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if api_keys_db:
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if request.is_json:
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json = get_json_dict(request)
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api_key = json.get("api_key")
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else:
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api_key = request.values.get("api_key")
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if api_key:
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db_req_limit = api_keys_db.lookup(api_key)
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if db_req_limit is not None:
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req_limit = db_req_limit * multiplier
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return req_limit
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def get_routes_limits(default_req_limit, daily_req_limit, api_keys_db):
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if default_req_limit == -1:
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# TODO: better way?
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default_req_limit = 9999999999999
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def minute_limits():
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return "%s per minute" % get_req_limits(default_req_limit, api_keys_db)
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def daily_limits():
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return "%s per day" % get_req_limits(daily_req_limit, api_keys_db, 1440)
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res = [minute_limits]
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if daily_req_limit > 0:
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res.append(daily_limits)
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return res
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def create_app(args):
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from app.init import boot
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boot(args.load_only)
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from app.language import languages
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app = Flask(__name__)
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if args.debug:
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app.config["TEMPLATES_AUTO_RELOAD"] = True
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# Map userdefined frontend languages to argos language object.
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if args.frontend_language_source == "auto":
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frontend_argos_language_source = type(
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"obj", (object,), {"code": "auto", "name": "Auto Detect"}
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)
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else:
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frontend_argos_language_source = next(
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iter([l for l in languages if l.code == args.frontend_language_source]),
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None,
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)
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frontend_argos_language_target = next(
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iter([l for l in languages if l.code == args.frontend_language_target]), None
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)
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# Raise AttributeError to prevent app startup if user input is not valid.
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if frontend_argos_language_source is None:
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raise AttributeError(
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f"{args.frontend_language_source} as frontend source language is not supported."
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)
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if frontend_argos_language_target is None:
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raise AttributeError(
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f"{args.frontend_language_target} as frontend target language is not supported."
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)
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api_keys_db = None
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if args.req_limit > 0 or args.api_keys or args.daily_req_limit > 0:
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api_keys_db = Database() if args.api_keys else None
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from flask_limiter import Limiter
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limiter = Limiter(
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app,
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key_func=get_remote_address,
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default_limits=get_routes_limits(
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args.req_limit, args.daily_req_limit, api_keys_db
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),
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)
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else:
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from .no_limiter import Limiter
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limiter = Limiter()
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if args.req_flood_threshold > 0:
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flood.setup(args.req_flood_threshold)
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def access_check(f):
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@wraps(f)
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def func(*a, **kw):
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if flood.is_banned(get_remote_address()):
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abort(403, description="Too many request limits violations")
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if args.api_keys and args.require_api_key_origin:
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if request.is_json:
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json = get_json_dict(request)
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ak = json.get("api_key")
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else:
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ak = request.values.get("api_key")
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if (
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api_keys_db.lookup(ak) is None and request.headers.get("Origin") != args.require_api_key_origin
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):
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abort(
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403,
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description="Please contact the server operator to obtain an API key",
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)
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return f(*a, **kw)
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return func
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@app.errorhandler(400)
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def invalid_api(e):
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return jsonify({"error": str(e.description)}), 400
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@app.errorhandler(500)
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def server_error(e):
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return jsonify({"error": str(e.description)}), 500
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@app.errorhandler(429)
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def slow_down_error(e):
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flood.report(get_remote_address())
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return jsonify({"error": "Slowdown: " + str(e.description)}), 429
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@app.errorhandler(403)
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def denied(e):
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return jsonify({"error": str(e.description)}), 403
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@app.route("/")
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@limiter.exempt
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def index():
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return render_template(
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"index.html",
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gaId=args.ga_id,
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frontendTimeout=args.frontend_timeout,
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api_keys=args.api_keys,
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web_version=os.environ.get("LT_WEB") is not None,
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)
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@app.route("/javascript-licenses", methods=["GET"])
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@limiter.exempt
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def javascript_licenses():
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return render_template("javascript-licenses.html")
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@app.route("/languages", methods=["GET", "POST"])
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@limiter.exempt
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def langs():
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"""
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Retrieve list of supported languages
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---
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tags:
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- translate
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responses:
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200:
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description: List of languages
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schema:
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id: languages
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type: array
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items:
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type: object
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properties:
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code:
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type: string
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description: Language code
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name:
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type: string
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description: Human-readable language name (in English)
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429:
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description: Slow down
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schema:
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id: error-slow-down
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type: object
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properties:
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error:
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type: string
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description: Reason for slow down
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"""
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return jsonify([{"code": l.code, "name": l.name} for l in languages])
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# Add cors
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@app.after_request
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def after_request(response):
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response.headers.add("Access-Control-Allow-Origin", "*")
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response.headers.add(
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"Access-Control-Allow-Headers", "Authorization, Content-Type"
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)
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response.headers.add("Access-Control-Expose-Headers", "Authorization")
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response.headers.add("Access-Control-Allow-Methods", "GET, POST")
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response.headers.add("Access-Control-Allow-Credentials", "true")
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response.headers.add("Access-Control-Max-Age", 60 * 60 * 24 * 20)
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return response
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@app.route("/translate", methods=["POST"])
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@access_check
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def translate():
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"""
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Translate text from a language to another
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---
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tags:
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- translate
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parameters:
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- in: formData
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name: q
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schema:
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oneOf:
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- type: string
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example: Hello world!
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- type: array
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example: ['Hello world!']
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required: true
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description: Text(s) to translate
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- in: formData
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name: source
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schema:
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type: string
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example: en
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required: true
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description: Source language code
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- in: formData
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name: target
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schema:
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type: string
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example: es
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required: true
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description: Target language code
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- in: formData
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name: api_key
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schema:
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type: string
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example: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
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required: false
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description: API key
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responses:
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200:
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description: Translated text
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schema:
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id: translate
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type: object
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properties:
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translatedText:
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oneOf:
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- type: string
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- type: array
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description: Translated text(s)
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400:
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description: Invalid request
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schema:
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id: error-response
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type: object
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properties:
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error:
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type: string
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description: Error message
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500:
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description: Translation error
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schema:
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id: error-response
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type: object
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properties:
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error:
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type: string
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description: Error message
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429:
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description: Slow down
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schema:
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id: error-slow-down
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type: object
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properties:
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error:
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type: string
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description: Reason for slow down
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403:
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description: Banned
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schema:
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id: error-response
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type: object
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properties:
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error:
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type: string
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description: Error message
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"""
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if request.is_json:
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json = get_json_dict(request)
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q = json.get("q")
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source_lang = json.get("source")
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target_lang = json.get("target")
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else:
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q = request.values.get("q")
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source_lang = request.values.get("source")
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target_lang = request.values.get("target")
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if not q:
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abort(400, description="Invalid request: missing q parameter")
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if not source_lang:
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abort(400, description="Invalid request: missing source parameter")
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if not target_lang:
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abort(400, description="Invalid request: missing target parameter")
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batch = isinstance(q, list)
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if batch and args.batch_limit != -1:
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batch_size = len(q)
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if args.batch_limit < batch_size:
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abort(
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400,
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description="Invalid request: Request (%d) exceeds text limit (%d)"
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% (batch_size, args.batch_limit),
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)
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if args.char_limit != -1:
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if batch:
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chars = sum([len(text) for text in q])
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else:
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chars = len(q)
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if args.char_limit < chars:
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abort(
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400,
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description="Invalid request: Request (%d) exceeds character limit (%d)"
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% (chars, args.char_limit),
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)
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if source_lang == "auto":
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source_langs = []
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if batch:
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auto_detect_texts = q
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else:
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auto_detect_texts = [q]
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overall_candidates = detect_languages(q)
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for text_to_check in auto_detect_texts:
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if len(text_to_check) > 40:
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candidate_langs = detect_languages(text_to_check)
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else:
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# Unable to accurately detect languages for short texts
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candidate_langs = overall_candidates
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source_langs.append(candidate_langs[0]["language"])
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if args.debug:
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print(text_to_check, candidate_langs)
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print("Auto detected: %s" % candidate_langs[0]["language"])
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else:
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if batch:
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source_langs = [source_lang for text in q]
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else:
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source_langs = [source_lang]
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src_langs = [next(iter([l for l in languages if l.code == source_lang]), None) for source_lang in source_langs]
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for idx, lang in enumerate(src_langs):
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if lang is None:
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abort(400, description="%s is not supported" % source_langs[idx])
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tgt_lang = next(iter([l for l in languages if l.code == target_lang]), None)
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if tgt_lang is None:
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abort(400, description="%s is not supported" % target_lang)
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try:
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if batch:
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results = []
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for idx, text in enumerate(q):
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translator = src_langs[idx].get_translation(tgt_lang)
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results.append(translator.translate(
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transliterate(text, target_lang=source_langs[idx])
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))
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return jsonify(
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{
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"translatedText": results
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}
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)
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else:
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translator = src_langs[0].get_translation(tgt_lang)
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return jsonify(
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{
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"translatedText": translator.translate(
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transliterate(q, target_lang=source_langs[0])
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)
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}
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)
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except Exception as e:
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abort(500, description="Cannot translate text: %s" % str(e))
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@app.route("/detect", methods=["POST"])
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@access_check
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def detect():
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"""
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Detect the language of a single text
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---
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tags:
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- translate
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parameters:
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- in: formData
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name: q
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schema:
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type: string
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example: Hello world!
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required: true
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description: Text to detect
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- in: formData
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name: api_key
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schema:
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type: string
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example: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
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required: false
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description: API key
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responses:
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200:
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description: Detections
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schema:
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id: detections
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type: array
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items:
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type: object
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properties:
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confidence:
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type: number
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format: float
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minimum: 0
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maximum: 1
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description: Confidence value
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example: 0.6
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language:
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type: string
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description: Language code
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example: en
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400:
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description: Invalid request
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schema:
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id: error-response
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type: object
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properties:
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error:
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type: string
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description: Error message
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500:
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description: Detection error
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schema:
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id: error-response
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type: object
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properties:
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error:
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type: string
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description: Error message
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429:
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description: Slow down
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schema:
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id: error-slow-down
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type: object
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properties:
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error:
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type: string
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description: Reason for slow down
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403:
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description: Banned
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schema:
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id: error-response
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type: object
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properties:
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error:
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type: string
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description: Error message
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"""
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if flood.is_banned(get_remote_address()):
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abort(403, description="Too many request limits violations")
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if request.is_json:
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json = get_json_dict(request)
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q = json.get("q")
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else:
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q = request.values.get("q")
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if not q:
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abort(400, description="Invalid request: missing q parameter")
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return jsonify(detect_languages(q))
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@app.route("/frontend/settings")
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@limiter.exempt
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def frontend_settings():
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"""
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Retrieve frontend specific settings
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---
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tags:
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- frontend
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responses:
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200:
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description: frontend settings
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schema:
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id: frontend-settings
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type: object
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properties:
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charLimit:
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type: integer
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description: Character input limit for this language (-1 indicates no limit)
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frontendTimeout:
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type: integer
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description: Frontend translation timeout
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language:
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type: object
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properties:
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source:
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type: object
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properties:
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code:
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type: string
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description: Language code
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name:
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type: string
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description: Human-readable language name (in English)
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target:
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type: object
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properties:
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code:
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type: string
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description: Language code
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name:
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type: string
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description: Human-readable language name (in English)
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"""
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return jsonify(
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{
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"charLimit": args.char_limit,
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"frontendTimeout": args.frontend_timeout,
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"language": {
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"source": {
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"code": frontend_argos_language_source.code,
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"name": frontend_argos_language_source.name,
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},
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"target": {
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"code": frontend_argos_language_target.code,
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"name": frontend_argos_language_target.name,
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},
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},
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}
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)
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swag = swagger(app)
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swag["info"]["version"] = "1.2"
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swag["info"]["title"] = "LibreTranslate"
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@app.route("/spec")
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@limiter.exempt
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def spec():
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return jsonify(swag)
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SWAGGER_URL = "/docs" # URL for exposing Swagger UI (without trailing '/')
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API_URL = "/spec"
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# Call factory function to create our blueprint
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swaggerui_blueprint = get_swaggerui_blueprint(SWAGGER_URL, API_URL)
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app.register_blueprint(swaggerui_blueprint)
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return app
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