LibreTranslate/app/app.py

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Python
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import io
import os
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import tempfile
import uuid
from functools import wraps
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import argostranslatefiles
import pkg_resources
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from argostranslatefiles import get_supported_formats
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from flask import Flask, abort, jsonify, render_template, request, url_for, send_file
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from flask_swagger import swagger
from flask_swagger_ui import get_swaggerui_blueprint
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from translatehtml import translate_html
from werkzeug.utils import secure_filename
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from app import flood
from app.language import detect_languages, transliterate
from .api_keys import Database
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from .suggestions import Database as SuggestionsDatabase
def get_json_dict(request):
d = request.get_json()
if not isinstance(d, dict):
abort(400, description="Invalid JSON format")
return d
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def get_remote_address():
if request.headers.getlist("X-Forwarded-For"):
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ip = request.headers.getlist("X-Forwarded-For")[0].split(",")[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
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:
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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):
if default_req_limit == -1:
# TODO: better way?
default_req_limit = 9999999999999
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def minute_limits():
return "%s per minute" % get_req_limits(default_req_limit, api_keys_db)
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def daily_limits():
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__)
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.
if args.frontend_language_source == "auto":
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frontend_argos_language_source = type(
"obj", (object,), {"code": "auto", "name": "Auto Detect"}
)
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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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frontend_argos_supported_files_format = []
for file_format in get_supported_formats():
for ff in file_format.supported_file_extensions:
frontend_argos_supported_files_format.append(ff)
# Raise AttributeError to prevent app startup if user input is not valid.
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."
)
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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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(
app,
key_func=get_remote_address,
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default_limits=get_routes_limits(
args.req_limit, args.daily_req_limit, api_keys_db
),
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)
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else:
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from .no_limiter import Limiter
limiter = Limiter()
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if args.req_flood_threshold > 0:
flood.setup(args.req_flood_threshold)
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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")
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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")
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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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):
abort(
403,
description="Please contact the server operator to obtain an API key",
)
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return f(*a, **kw)
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return func
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@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):
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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)
def denied(e):
return jsonify({"error": str(e.description)}), 403
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@app.route("/")
@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,
api_keys=args.api_keys,
web_version=os.environ.get("LT_WEB") is not None,
version=pkg_resources.require("LibreTranslate")[0].version
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)
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@app.route("/javascript-licenses", methods=["GET"])
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@limiter.exempt
def javascript_licenses():
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return render_template("javascript-licenses.html")
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@app.route("/languages", methods=["GET", "POST"])
@limiter.exempt
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def langs():
"""
Retrieve list of supported languages
---
tags:
- translate
responses:
200:
description: List of languages
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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)
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429:
description: Slow down
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schema:
id: error-slow-down
type: object
properties:
error:
type: string
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
@app.after_request
def after_request(response):
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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)
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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():
"""
Translate text from a language to another
---
tags:
- translate
parameters:
- in: formData
name: q
schema:
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oneOf:
- type: string
example: Hello world!
- type: array
example: ['Hello world!']
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required: true
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description: Text(s) to translate
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- in: formData
name: source
schema:
type: string
example: en
required: true
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description: Source language code
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- in: formData
name: target
schema:
type: string
example: es
required: true
description: Target language code
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- in: formData
name: format
schema:
type: string
enum: [text, html]
default: text
example: text
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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
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responses:
200:
description: Translated text
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schema:
id: translate
type: object
properties:
translatedText:
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oneOf:
- type: string
- type: array
description: Translated text(s)
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400:
description: Invalid request
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schema:
id: error-response
type: object
properties:
error:
type: string
description: Error message
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500:
description: Translation error
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schema:
id: error-response
type: object
properties:
error:
type: string
description: Error message
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429:
description: Slow down
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schema:
id: error-slow-down
type: object
properties:
error:
type: string
description: Reason for slow down
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403:
description: Banned
schema:
id: error-response
type: object
properties:
error:
type: string
description: Error message
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"""
if request.is_json:
json = get_json_dict(request)
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q = json.get("q")
source_lang = json.get("source")
target_lang = json.get("target")
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text_format = json.get("format")
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else:
q = request.values.get("q")
source_lang = request.values.get("source")
target_lang = request.values.get("target")
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text_format = request.values.get("format")
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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")
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batch = isinstance(q, list)
if batch and args.batch_limit != -1:
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batch_size = len(q)
if args.batch_limit < batch_size:
abort(
400,
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(
400,
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":
source_langs = []
if batch:
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auto_detect_texts = q
else:
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auto_detect_texts = [q]
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:
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:
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if batch:
source_langs = [source_lang for text in q]
else:
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:
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:
abort(400, description="%s is not supported" % target_lang)
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if not text_format:
text_format = "text"
if text_format not in ["text", "html"]:
abort(400, description="%s format is not supported" % text_format)
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try:
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if batch:
results = []
for idx, text in enumerate(q):
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translator = src_langs[idx].get_translation(tgt_lang)
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if text_format == "html":
translated_text = str(translate_html(translator, text))
else:
translated_text = translator.translate(transliterate(text, target_lang=source_langs[idx]))
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results.append(translated_text)
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return jsonify(
{
"translatedText": results
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}
)
else:
translator = src_langs[0].get_translation(tgt_lang)
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if text_format == "html":
translated_text = str(translate_html(translator, q))
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else:
translated_text = translator.translate(transliterate(q, target_lang=source_langs[0]))
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return jsonify(
{
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"translatedText": translated_text
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}
)
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except Exception as e:
abort(500, description="Cannot translate text: %s" % str(e))
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@app.route("/translate_file", methods=["POST"])
@access_check
def translate_file():
"""
Translate file from a language to another
---
tags:
- translate
consumes:
- multipart/form-data
parameters:
- in: formData
name: file
type: file
required: true
description: file 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: api_key
schema:
type: string
example: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
required: false
description: API key
responses:
200:
description: Translated file
schema:
id: translate
type: object
properties:
translatedFileUrl:
type: string
description: Translated file url
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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
"""
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source_lang = request.form.get("source")
target_lang = request.form.get("target")
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file = request.files['file']
if not file:
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 file.filename == '':
abort(400, description="Invalid request: empty file")
if os.path.splitext(file.filename)[1] not in frontend_argos_supported_files_format:
abort(400, description="Invalid request: file format not supported")
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)
try:
filename = str(uuid.uuid4()) + '.' + secure_filename(file.filename)
filepath = os.path.join(tempfile.gettempdir(), filename)
file.save(filepath)
translated_file_path = argostranslatefiles.translate_file(src_langs[0].get_translation(tgt_lang), filepath)
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translated_filename = os.path.basename(translated_file_path)
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return jsonify(
{
"translatedFileUrl": url_for('download_file', filename=translated_filename, _external=True)
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}
)
except Exception as e:
abort(500, description=e)
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@app.route("/download_file/<string:filename>", methods=["GET"])
@access_check
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def download_file(filename: str):
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"""
Download a translated file
"""
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filename.split('.').pop(0)
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filepath = os.path.join(tempfile.gettempdir(), filename)
return_data = io.BytesIO()
with open(filepath, 'rb') as fo:
return_data.write(fo.read())
return_data.seek(0)
os.remove(filepath)
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return send_file(return_data, attachment_filename=filename)
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@app.route("/detect", methods=["POST"])
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@access_check
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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
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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
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description: Error message
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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
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403:
description: Banned
schema:
id: error-response
type: object
properties:
error:
type: string
description: Error message
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"""
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if flood.is_banned(get_remote_address()):
abort(403, description="Too many request limits violations")
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if request.is_json:
json = get_json_dict(request)
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q = json.get("q")
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else:
q = request.values.get("q")
if not q:
abort(400, description="Invalid request: missing q parameter")
return jsonify(detect_languages(q))
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@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:
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charLimit:
type: integer
description: Character input limit for this language (-1 indicates no limit)
frontendTimeout:
type: integer
description: Frontend translation timeout
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suggestions:
type: boolean
description: Whether submitting suggestions is enabled.
supportedFilesFormat:
type: array
items:
type: string
description: Supported files format
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)
"""
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return jsonify(
{
"charLimit": args.char_limit,
"frontendTimeout": args.frontend_timeout,
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"suggestions": args.suggestions,
"supportedFilesFormat": frontend_argos_supported_files_format,
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"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,
},
},
}
)
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@app.route("/suggest", methods=["POST"])
@limiter.exempt
def suggest():
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"""
Submit a suggestion to improve a translation
---
tags:
- feedback
parameters:
- in: formData
name: q
schema:
type: string
example: Hello world!
required: true
description: Original text
- in: formData
name: s
schema:
type: string
example: ¡Hola mundo!
required: true
description: Suggested translation
- in: formData
name: source
schema:
type: string
example: en
required: true
description: Language of original text
- in: formData
name: target
schema:
type: string
example: es
required: true
description: Language of suggested translation
responses:
200:
description: Success
schema:
id: suggest-response
type: object
properties:
success:
type: boolean
description: Whether submission was successful
403:
description: Not authorized
schema:
id: error-response
type: object
properties:
error:
type: string
description: Error message
"""
if not args.suggestions:
abort(403, description="Suggestions are disabled on this server.")
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q = request.values.get("q")
s = request.values.get("s")
source_lang = request.values.get("source")
target_lang = request.values.get("target")
SuggestionsDatabase().add(q, s, source_lang, target_lang)
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return jsonify({"success": True})
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swag = swagger(app)
swag["info"]["version"] = "1.2.1"
swag["info"]["title"] = "LibreTranslate"
@app.route("/spec")
@limiter.exempt
def spec():
return jsonify(swag)
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SWAGGER_URL = "/docs" # URL for exposing Swagger UI (without trailing '/')
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