mirror of
https://github.com/LibreTranslate/LibreTranslate.git
synced 2024-11-14 20:21:13 +00:00
624 lines
19 KiB
Python
624 lines
19 KiB
Python
import os
|
|
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 app import flood
|
|
from app.language import detect_languages, transliterate
|
|
|
|
from .api_keys import Database
|
|
|
|
from translatehtml import translate_html
|
|
|
|
def get_json_dict(request):
|
|
d = request.get_json()
|
|
if not isinstance(d, dict):
|
|
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].split(",")[0]
|
|
else:
|
|
ip = request.remote_addr or "127.0.0.1"
|
|
|
|
return ip
|
|
|
|
|
|
def get_req_limits(default_limit, api_keys_db, multiplier = 1):
|
|
req_limit = default_limit
|
|
|
|
if api_keys_db:
|
|
if request.is_json:
|
|
json = get_json_dict(request)
|
|
api_key = json.get("api_key")
|
|
else:
|
|
api_key = request.values.get("api_key")
|
|
|
|
if api_key:
|
|
db_req_limit = api_keys_db.lookup(api_key)
|
|
if db_req_limit is not None:
|
|
req_limit = db_req_limit * multiplier
|
|
|
|
return req_limit
|
|
|
|
|
|
def get_routes_limits(default_req_limit, daily_req_limit, api_keys_db):
|
|
if default_req_limit == -1:
|
|
# TODO: better way?
|
|
default_req_limit = 9999999999999
|
|
|
|
def minute_limits():
|
|
return "%s per minute" % get_req_limits(default_req_limit, api_keys_db)
|
|
|
|
def daily_limits():
|
|
return "%s per day" % get_req_limits(daily_req_limit, api_keys_db, 1440)
|
|
|
|
res = [minute_limits]
|
|
|
|
if daily_req_limit > 0:
|
|
res.append(daily_limits)
|
|
|
|
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
|
|
|
|
# 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"}
|
|
)
|
|
else:
|
|
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
|
|
)
|
|
|
|
# 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."
|
|
)
|
|
if frontend_argos_language_target is None:
|
|
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, api_keys_db
|
|
),
|
|
)
|
|
else:
|
|
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
|
|
|
|
@app.errorhandler(500)
|
|
def server_error(e):
|
|
return jsonify({"error": str(e.description)}), 500
|
|
|
|
@app.errorhandler(429)
|
|
def slow_down_error(e):
|
|
flood.report(get_remote_address())
|
|
return jsonify({"error": "Slowdown: " + str(e.description)}), 429
|
|
|
|
@app.errorhandler(403)
|
|
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,
|
|
)
|
|
|
|
@app.route("/javascript-licenses", methods=["GET"])
|
|
@limiter.exempt
|
|
def javascript_licenses():
|
|
return render_template("javascript-licenses.html")
|
|
|
|
@app.route("/languages", methods=["GET", "POST"])
|
|
@limiter.exempt
|
|
def langs():
|
|
"""
|
|
Retrieve list of supported languages
|
|
---
|
|
tags:
|
|
- translate
|
|
responses:
|
|
200:
|
|
description: List of languages
|
|
schema:
|
|
id: languages
|
|
type: array
|
|
items:
|
|
type: object
|
|
properties:
|
|
code:
|
|
type: string
|
|
description: Language code
|
|
name:
|
|
type: string
|
|
description: Human-readable language name (in English)
|
|
429:
|
|
description: Slow down
|
|
schema:
|
|
id: error-slow-down
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Reason for slow down
|
|
"""
|
|
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)
|
|
return response
|
|
|
|
@app.route("/translate", methods=["POST"])
|
|
@access_check
|
|
def translate():
|
|
"""
|
|
Translate text from a language to another
|
|
---
|
|
tags:
|
|
- translate
|
|
parameters:
|
|
- in: formData
|
|
name: q
|
|
schema:
|
|
oneOf:
|
|
- type: string
|
|
example: Hello world!
|
|
- type: array
|
|
example: ['Hello world!']
|
|
required: true
|
|
description: Text(s) 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
|
|
- in: formData
|
|
name: format
|
|
schema:
|
|
type: string
|
|
enum: [text, html]
|
|
default: text
|
|
example: text
|
|
required: false
|
|
description: >
|
|
Format of source text:
|
|
* `text` - Plain text
|
|
* `html` - HTML markup
|
|
- in: formData
|
|
name: api_key
|
|
schema:
|
|
type: string
|
|
example: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
|
|
required: false
|
|
description: API key
|
|
responses:
|
|
200:
|
|
description: Translated text
|
|
schema:
|
|
id: translate
|
|
type: object
|
|
properties:
|
|
translatedText:
|
|
oneOf:
|
|
- type: string
|
|
- type: array
|
|
description: Translated text(s)
|
|
400:
|
|
description: Invalid request
|
|
schema:
|
|
id: error-response
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Error message
|
|
500:
|
|
description: Translation error
|
|
schema:
|
|
id: error-response
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Error message
|
|
429:
|
|
description: Slow down
|
|
schema:
|
|
id: error-slow-down
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Reason for slow down
|
|
403:
|
|
description: Banned
|
|
schema:
|
|
id: error-response
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Error message
|
|
"""
|
|
if request.is_json:
|
|
json = get_json_dict(request)
|
|
q = json.get("q")
|
|
source_lang = json.get("source")
|
|
target_lang = json.get("target")
|
|
text_format = json.get("format")
|
|
else:
|
|
q = request.values.get("q")
|
|
source_lang = request.values.get("source")
|
|
target_lang = request.values.get("target")
|
|
text_format = request.values.get("format")
|
|
|
|
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")
|
|
|
|
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),
|
|
)
|
|
|
|
if args.char_limit != -1:
|
|
if batch:
|
|
chars = sum([len(text) for text in q])
|
|
else:
|
|
chars = len(q)
|
|
|
|
if args.char_limit < chars:
|
|
abort(
|
|
400,
|
|
description="Invalid request: Request (%d) exceeds character limit (%d)"
|
|
% (chars, args.char_limit),
|
|
)
|
|
|
|
if source_lang == "auto":
|
|
source_langs = []
|
|
if batch:
|
|
auto_detect_texts = q
|
|
else:
|
|
auto_detect_texts = [q]
|
|
|
|
overall_candidates = detect_languages(q)
|
|
|
|
for text_to_check in auto_detect_texts:
|
|
if len(text_to_check) > 40:
|
|
candidate_langs = detect_languages(text_to_check)
|
|
else:
|
|
# Unable to accurately detect languages for short texts
|
|
candidate_langs = overall_candidates
|
|
source_langs.append(candidate_langs[0]["language"])
|
|
|
|
if args.debug:
|
|
print(text_to_check, candidate_langs)
|
|
print("Auto detected: %s" % candidate_langs[0]["language"])
|
|
else:
|
|
if batch:
|
|
source_langs = [source_lang for text in q]
|
|
else:
|
|
source_langs = [source_lang]
|
|
|
|
src_langs = [next(iter([l for l in languages if l.code == source_lang]), None) for source_lang in source_langs]
|
|
|
|
for idx, lang in enumerate(src_langs):
|
|
if lang is None:
|
|
abort(400, description="%s is not supported" % source_langs[idx])
|
|
|
|
tgt_lang = next(iter([l for l in languages if l.code == target_lang]), None)
|
|
|
|
if tgt_lang is None:
|
|
abort(400, description="%s is not supported" % target_lang)
|
|
|
|
if not text_format:
|
|
text_format = "text"
|
|
|
|
if text_format not in ["text", "html"]:
|
|
abort(400, description="%s format is not supported" % text_format)
|
|
|
|
|
|
try:
|
|
if batch:
|
|
results = []
|
|
for idx, text in enumerate(q):
|
|
translator = src_langs[idx].get_translation(tgt_lang)
|
|
|
|
if text_format == "html":
|
|
translated_text = str(translate_html(translator, text))
|
|
else:
|
|
translated_text = translator.translate(transliterate(text, target_lang=source_langs[idx]))
|
|
|
|
results.append(translated_text)
|
|
return jsonify(
|
|
{
|
|
"translatedText": results
|
|
}
|
|
)
|
|
else:
|
|
translator = src_langs[0].get_translation(tgt_lang)
|
|
|
|
if text_format == "html":
|
|
translated_text = str(translate_html(translator, q))
|
|
else:
|
|
translated_text = translator.translate(transliterate(q, target_lang=source_langs[0]))
|
|
return jsonify(
|
|
{
|
|
"translatedText": translated_text
|
|
}
|
|
)
|
|
except Exception as e:
|
|
abort(500, description="Cannot translate text: %s" % str(e))
|
|
|
|
@app.route("/detect", methods=["POST"])
|
|
@access_check
|
|
def detect():
|
|
"""
|
|
Detect the language of a single text
|
|
---
|
|
tags:
|
|
- translate
|
|
parameters:
|
|
- in: formData
|
|
name: q
|
|
schema:
|
|
type: string
|
|
example: Hello world!
|
|
required: true
|
|
description: Text to detect
|
|
- in: formData
|
|
name: api_key
|
|
schema:
|
|
type: string
|
|
example: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
|
|
required: false
|
|
description: API key
|
|
responses:
|
|
200:
|
|
description: Detections
|
|
schema:
|
|
id: detections
|
|
type: array
|
|
items:
|
|
type: object
|
|
properties:
|
|
confidence:
|
|
type: number
|
|
format: float
|
|
minimum: 0
|
|
maximum: 1
|
|
description: Confidence value
|
|
example: 0.6
|
|
language:
|
|
type: string
|
|
description: Language code
|
|
example: en
|
|
400:
|
|
description: Invalid request
|
|
schema:
|
|
id: error-response
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Error message
|
|
500:
|
|
description: Detection error
|
|
schema:
|
|
id: error-response
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Error message
|
|
429:
|
|
description: Slow down
|
|
schema:
|
|
id: error-slow-down
|
|
type: object
|
|
properties:
|
|
error:
|
|
type: string
|
|
description: Reason for slow down
|
|
403:
|
|
description: Banned
|
|
schema:
|
|
id: error-response
|
|
type: object
|
|
properties:
|
|
error:
|
|
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")
|
|
else:
|
|
q = request.values.get("q")
|
|
|
|
if not q:
|
|
abort(400, description="Invalid request: missing q parameter")
|
|
|
|
return jsonify(detect_languages(q))
|
|
|
|
@app.route("/frontend/settings")
|
|
@limiter.exempt
|
|
def frontend_settings():
|
|
"""
|
|
Retrieve frontend specific settings
|
|
---
|
|
tags:
|
|
- frontend
|
|
responses:
|
|
200:
|
|
description: frontend settings
|
|
schema:
|
|
id: frontend-settings
|
|
type: object
|
|
properties:
|
|
charLimit:
|
|
type: integer
|
|
description: Character input limit for this language (-1 indicates no limit)
|
|
frontendTimeout:
|
|
type: integer
|
|
description: Frontend translation timeout
|
|
language:
|
|
type: object
|
|
properties:
|
|
source:
|
|
type: object
|
|
properties:
|
|
code:
|
|
type: string
|
|
description: Language code
|
|
name:
|
|
type: string
|
|
description: Human-readable language name (in English)
|
|
target:
|
|
type: object
|
|
properties:
|
|
code:
|
|
type: string
|
|
description: Language code
|
|
name:
|
|
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,
|
|
},
|
|
},
|
|
}
|
|
)
|
|
|
|
swag = swagger(app)
|
|
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"
|
|
|
|
# Call factory function to create our blueprint
|
|
swaggerui_blueprint = get_swaggerui_blueprint(SWAGGER_URL, API_URL)
|
|
|
|
app.register_blueprint(swaggerui_blueprint)
|
|
|
|
return app
|