LibreTranslate/app/app.py

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from flask import Flask, render_template, jsonify, request, abort, send_from_directory
from flask_swagger import swagger
from flask_swagger_ui import get_swaggerui_blueprint
from flask_limiter.util import get_remote_address
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def create_app(char_limit=-1, req_limit=-1, ga_id=None, debug=False):
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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__)
if debug:
app.config['TEMPLATES_AUTO_RELOAD'] = True
if req_limit > 0:
from flask_limiter import Limiter
limiter = Limiter(
app,
key_func=get_remote_address,
default_limits=["%s per minute" % req_limit]
)
@app.errorhandler(400)
def invalid_api(e):
return jsonify({"error": str(e.description)}), 400
@app.errorhandler(500)
def server_error(e):
return jsonify({"error": str(e.description)}), 500
@app.errorhandler(429)
def slow_down_error(e):
return jsonify({"error": "Slowdown: " + str(e.description)}), 429
@app.route("/")
def index():
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return render_template('index.html', gaId=ga_id)
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@app.route("/languages")
def langs():
"""
Retrieve list of supported languages
---
tags:
- translate
responses:
200:
description: List of languages
content:
application/json:
schema:
type: array
items:
type: object
properties:
code:
type: string
description: Language code
name:
type: string
description: Human-readable language name (in English)
charLimit:
type: string
description: Character input limit for this language (-1 indicates no limit)
429:
description: Slow down
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Reason for slow down
"""
return jsonify([{'code': l.code, 'name': l.name, 'charLimit': char_limit } 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)
return response
@app.route("/translate", methods=['POST'])
def translate():
"""
Translate text from a language to another
---
tags:
- translate
parameters:
- in: formData
name: q
schema:
type: string
example: Hello world!
required: true
description: Text to translate
- in: formData
name: source
schema:
type: string
example: en
required: true
description: Source language code
- in: formData
name: target
schema:
type: string
example: es
required: true
description: Target language code
responses:
200:
description: Translated text
content:
application/json:
schema:
type: object
properties:
translatedText:
type: string
description: Translated text
400:
description: Invalid request
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Error message
500:
description: Translation error
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Error message
429:
description: Slow down
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Reason for slow down
"""
if request.is_json:
json = request.get_json()
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")
target_lang = request.values.get("target")
if not q:
abort(400, description="Invalid request: missing q parameter")
if not source_lang:
abort(400, description="Invalid request: missing source parameter")
if not target_lang:
abort(400, description="Invalid request: missing target parameter")
if char_limit != -1:
q = q[:char_limit]
src_lang = next(iter([l for l in languages if l.code == source_lang]), None)
tgt_lang = next(iter([l for l in languages if l.code == target_lang]), None)
if src_lang is None:
abort(400, description="%s is not supported" % source_lang)
if tgt_lang is None:
abort(400, description="%s is not supported" % target_lang)
translator = src_lang.get_translation(tgt_lang)
try:
return jsonify({"translatedText": translator.translate(q) })
except Exception as e:
abort(500, description="Cannot translate text: %s" % str(e))
swag = swagger(app)
swag['info']['version'] = "1.0"
swag['info']['title'] = "LibreTranslate"
@app.route("/spec")
def spec():
return jsonify(swag)
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
swaggerui_blueprint = get_swaggerui_blueprint(
SWAGGER_URL,
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API_URL
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)
app.register_blueprint(swaggerui_blueprint)
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return app