forked from mirrors/LibreTranslate
458 lines
14 KiB
Python
458 lines
14 KiB
Python
import os
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from flask import Flask, render_template, jsonify, request, abort, send_from_directory
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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 langdetect import detect_langs
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from langdetect import DetectorFactory
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from pkg_resources import resource_filename
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from .api_keys import Database
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DetectorFactory.seed = 0 # deterministic
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api_keys_db = None
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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_routes_limits(default_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 limits():
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req_limit = default_req_limit
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if api_keys_db:
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if request.is_json:
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json = request.get_json()
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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
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return "%s per minute" % req_limit
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return [limits]
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def create_app(args):
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if not args.offline:
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from app.init import boot
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boot()
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from app.language import languages
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app = Flask(__name__)
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# For faster access
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language_map = {}
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for l in languages:
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language_map[l.code] = l.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('obj', (object,), {
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'code': 'auto',
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'name': 'Auto Detect'
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})
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else:
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frontend_argos_language_source = next(iter([l for l in languages if l.code == args.frontend_language_source]), None)
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frontend_argos_language_target = next(iter([l for l in languages if l.code == args.frontend_language_target]), None)
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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(f"{args.frontend_language_source} as frontend source language is not supported.")
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if frontend_argos_language_target is None:
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raise AttributeError(f"{args.frontend_language_target} as frontend target language is not supported.")
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if args.req_limit > 0 or args.api_keys:
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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(args.req_limit, Database() if args.api_keys else None)
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)
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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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return jsonify({"error": "Slowdown: " + str(e.description)}), 429
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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('index.html', gaId=args.ga_id, frontendTimeout=args.frontend_timeout, offline=args.offline, api_keys=args.api_keys, web_version=os.environ.get('LT_WEB') is not None)
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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('Access-Control-Allow-Headers', "Authorization, Content-Type")
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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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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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"""
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if request.is_json:
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json = request.get_json()
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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(400, description="Invalid request: Request (%d) exceeds text limit (%d)" % (batch_size, args.batch_limit))
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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(400, description="Invalid request: Request (%d) exceeds character limit (%d)" % (chars, args.char_limit))
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if source_lang == 'auto':
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candidate_langs = list(filter(lambda l: l.lang in language_map, detect_langs(q)))
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if len(candidate_langs) > 0:
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candidate_langs.sort(key=lambda l: l.prob, reverse=True)
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if args.debug:
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print(candidate_langs)
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source_lang = next(iter([l.code for l in languages if l.code == candidate_langs[0].lang]), None)
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if not source_lang:
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source_lang = 'en'
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else:
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source_lang = 'en'
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if args.debug:
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print("Auto detected: %s" % source_lang)
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src_lang = next(iter([l for l in languages if l.code == source_lang]), None)
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tgt_lang = next(iter([l for l in languages if l.code == target_lang]), None)
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if src_lang is None:
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abort(400, description="%s is not supported" % source_lang)
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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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translator = src_lang.get_translation(tgt_lang)
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try:
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if batch:
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return jsonify({"translatedText": [translator.translate(text) for text in q] })
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else:
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return jsonify({"translatedText": translator.translate(q) })
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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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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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"""
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if request.is_json:
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json = request.get_json()
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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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candidate_langs = list(filter(lambda l: l.lang in language_map, detect_langs(q)))
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candidate_langs.sort(key=lambda l: l.prob, reverse=True)
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return jsonify([{
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'confidence': l.prob,
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'language': l.lang
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} for l in candidate_langs])
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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({'charLimit': args.char_limit,
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'frontendTimeout': args.frontend_timeout,
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'language': {
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'source': {'code': frontend_argos_language_source.code, 'name': frontend_argos_language_source.name},
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'target': {'code': frontend_argos_language_target.code, 'name': frontend_argos_language_target.name}}
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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(
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SWAGGER_URL,
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API_URL
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)
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app.register_blueprint(swaggerui_blueprint)
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return app
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