Merge pull request #157 from dingedi/main

[WIP] Add files translation

README.md

@@ -150,6 +150,7 @@ docker-compose up -d --build
 | --require-api-key-origin | Require use of an API key for programmatic access to the API, unless the request origin matches this domain | `No restrictions on domain origin` | LT_REQUIRE_API_KEY_ORIGIN |
 | --load-only   | Set available languages    | `all from argostranslate`    | LT_LOAD_ONLY |
 | --suggestions   | Allow user suggestions    | `false`    | LT_SUGGESTIONS |
+| --disable-files-translation   | Disable files translation    | `false`    | LT_DISABLE_FILES_TRANSLATION |
 
 Note that each argument has an equivalent env. variable that can be used instead. The env. variables overwrite the default values but have lower priority than the command aguments. They are particularly useful if used with Docker. Their name is the upper-snake case of the command arguments' ones, with a `LT` prefix.
 

VERSION

@@ -0,0 +1 @@
+1.2.6

app/app.py

@@ -1,18 +1,38 @@
+import io
 import os
+import tempfile
+import uuid
 from functools import wraps
 
-import pkg_resources
+import argostranslatefiles
-from flask import Flask, abort, jsonify, render_template, request
+from argostranslatefiles import get_supported_formats
+from flask import Flask, abort, jsonify, render_template, request, url_for, send_file
 from flask_swagger import swagger
 from flask_swagger_ui import get_swaggerui_blueprint
+from translatehtml import translate_html
+from werkzeug.utils import secure_filename
 
-from app import flood
+from app import flood, remove_translated_files, security
 from app.language import detect_languages, transliterate
-
 from .api_keys import Database
 from .suggestions import Database as SuggestionsDatabase
 
-from translatehtml import translate_html
+
+def get_version():
+    try:
+        with open("VERSION") as f:
+            return f.read().strip()
+    except:
+        return "?"
+
+def get_upload_dir():
+    upload_dir = os.path.join(tempfile.gettempdir(), "libretranslate-files-translate")
+
+    if not os.path.isdir(upload_dir):
+        os.mkdir(upload_dir)
+
+    return upload_dir
+
 
 def get_json_dict(request):
     d = request.get_json()
@@ -30,7 +50,7 @@ def get_remote_address():
     return ip
 
 
-def get_req_limits(default_limit, api_keys_db, multiplier = 1):
+def get_req_limits(default_limit, api_keys_db, multiplier=1):
     req_limit = default_limit
 
     if api_keys_db:
@@ -79,6 +99,9 @@ def create_app(args):
     if args.debug:
         app.config["TEMPLATES_AUTO_RELOAD"] = True
 
+    if not args.disable_files_translation:
+        remove_translated_files.setup(get_upload_dir())
+
     # Map userdefined frontend languages to argos language object.
     if args.frontend_language_source == "auto":
         frontend_argos_language_source = type(
@@ -94,6 +117,12 @@ def create_app(args):
         iter([l for l in languages if l.code == args.frontend_language_target]), None
     )
 
+    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:
         raise AttributeError(
@@ -177,7 +206,7 @@ def create_app(args):
             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
+            version=get_version()
         )
 
     @app.route("/javascript-licenses", methods=["GET"])
@@ -420,7 +449,6 @@ def create_app(args):
         if text_format not in ["text", "html"]:
             abort(400, description="%s format is not supported" % text_format)
 
-
         try:
             if batch:
                 results = []
@@ -453,6 +481,167 @@ def create_app(args):
         except Exception as e:
             abort(500, description="Cannot translate text: %s" % str(e))
 
+    @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
+          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 args.disable_files_translation:
+            abort(403, description="Files translation are disabled on this server.")
+
+        source_lang = request.form.get("source")
+        target_lang = request.form.get("target")
+        file = request.files['file']
+
+        if not file:
+            abort(400, description="Invalid request: missing file 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(get_upload_dir(), filename)
+
+            file.save(filepath)
+
+            translated_file_path = argostranslatefiles.translate_file(src_langs[0].get_translation(tgt_lang), filepath)
+            translated_filename = os.path.basename(translated_file_path)
+
+            return jsonify(
+                {
+                    "translatedFileUrl": url_for('download_file', filename=translated_filename, _external=True)
+                }
+            )
+        except Exception as e:
+            abort(500, description=e)
+
+    @app.route("/download_file/<string:filename>", methods=["GET"])
+    @access_check
+    def download_file(filename: str):
+        """
+        Download a translated file
+        """
+        if args.disable_files_translation:
+            abort(400, description="Files translation are disabled on this server.")
+        
+        filepath = os.path.join(get_upload_dir(), filename)
+        try:
+            checked_filepath = security.path_traversal_check(filepath, get_upload_dir())
+            if os.path.isfile(checked_filepath):
+                filepath = checked_filepath
+        except security.SuspiciousFileOperation:
+            abort(400, description="Invalid filename")
+
+        return_data = io.BytesIO()
+        with open(filepath, 'rb') as fo:
+            return_data.write(fo.read())
+        return_data.seek(0)
+
+        download_filename = filename.split('.')
+        download_filename.pop(0)
+        download_filename = '.'.join(download_filename)
+
+        return send_file(return_data, as_attachment=True, attachment_filename=download_filename)
+
     @app.route("/detect", methods=["POST"])
     @access_check
     def detect():
@@ -571,6 +760,11 @@ def create_app(args):
                 suggestions:
                   type: boolean
                   description: Whether submitting suggestions is enabled.
+                supportedFilesFormat:
+                  type: array
+                  items:
+                    type: string
+                  description: Supported files format
                 language:
                   type: object
                   properties:
@@ -598,6 +792,8 @@ def create_app(args):
                 "charLimit": args.char_limit,
                 "frontendTimeout": args.frontend_timeout,
                 "suggestions": args.suggestions,
+                "filesTranslation": not args.disable_files_translation,
+                "supportedFilesFormat": [] if args.disable_files_translation else frontend_argos_supported_files_format,
                 "language": {
                     "source": {
                         "code": frontend_argos_language_source.code,
@@ -680,7 +876,7 @@ def create_app(args):
         return jsonify({"success": True})
 
     swag = swagger(app)
-    swag["info"]["version"] = "1.2.1"
+    swag["info"]["version"] = "1.3.0"
     swag["info"]["title"] = "LibreTranslate"
 
     @app.route("/spec")

app/default_values.py

@@ -115,6 +115,11 @@ _default_options_objects = [
         'name': 'SUGGESTIONS',
         'default_value': False,
         'value_type':  'bool'
+    },
+    {
+        'name': 'DISABLE_FILES_TRANSLATION',
+        'default_value': False,
+        'value_type': 'bool'
     }
 ]
 

app/main.py

@@ -105,6 +105,9 @@ def main():
     parser.add_argument(
         "--suggestions", default=DEFARGS['SUGGESTIONS'], action="store_true", help="Allow user suggestions"
     )
+    parser.add_argument(
+        "--disable-files-translation", default=DEFARGS['DISABLE_FILES_TRANSLATION'], action="store_true", help="Disable files translation"
+    )
 
     args = parser.parse_args()
     app = create_app(args)

app/remove_translated_files.py

@@ -0,0 +1,26 @@
+import atexit
+import os
+import time
+from datetime import datetime
+
+from apscheduler.schedulers.background import BackgroundScheduler
+
+
+def remove_translated_files(upload_dir: str):
+    now = time.mktime(datetime.now().timetuple())
+
+    for f in os.listdir(upload_dir):
+        f = os.path.join(upload_dir, f)
+        if os.path.isfile(f):
+            f_time = os.path.getmtime(f)
+            if (now - f_time) > 1800:  # 30 minutes
+                os.remove(f)
+
+
+def setup(upload_dir):
+    scheduler = BackgroundScheduler(daemon=True)
+    scheduler.add_job(remove_translated_files, "interval", minutes=30, kwargs={'upload_dir': upload_dir})
+    scheduler.start()
+
+    # Shut down the scheduler when exiting the app
+    atexit.register(lambda: scheduler.shutdown())

app/security.py

@@ -0,0 +1,14 @@
+import os
+
+class SuspiciousFileOperation(Exception):
+    pass
+
+def path_traversal_check(unsafe_path, known_safe_path):
+    known_safe_path = os.path.abspath(known_safe_path)
+    unsafe_path = os.path.abspath(unsafe_path)
+
+    if (os.path.commonprefix([known_safe_path, unsafe_path]) != known_safe_path):
+        raise SuspiciousFileOperation("{} is not safe".format(unsafe_path))
+
+    # Passes the check
+    return unsafe_path

app/static/css/main.css

@@ -23,6 +23,10 @@ h3.header {
   margin-top: 0 !important;
 }
 
+.mb-1 {
+    margin-bottom: 1rem;
+}
+
 .position-relative {
   position: relative;
 }
@@ -114,6 +118,42 @@ h3.header {
   display: flex;
 }
 
+.btn-switch-type {
+    background-color: #fff;
+    color: #42A5F5;
+}
+
+.btn-switch-type:focus {
+  background-color: inherit;
+}
+
+.btn-switch-type:hover {
+    background-color: #eee !important;
+    color: #42A5F5;
+}
+
+.btn-switch-type.active {
+    background-color: #42A5F5 !important;
+    color: #fff;
+}
+
+.file-dropzone {
+  font-size: 1.1rem;
+  border: 1px solid #ccc;
+  background: #f3f3f3;
+  padding: 1rem 2rem 1rem 1.5rem;
+  min-height: 220px;
+  position: relative;
+}
+
+.dropzone-content {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+
+  transform: translate(-50%, -50%);
+}
+
 .btn-action {
   display: flex;
   align-items: center;

app/static/js/app.js

@@ -30,6 +30,13 @@ document.addEventListener('DOMContentLoaded', function(){
 
             suggestions: false,
             isSuggesting: false,
+
+            supportedFilesFormat : [],
+            translationType: "text",
+            inputFile: false,
+            loadingFileTranslation: false,
+            translatedFileUrl: false,
+            filesTranslation: true,
         },
         mounted: function(){
             var self = this;
@@ -44,6 +51,8 @@ document.addEventListener('DOMContentLoaded', function(){
                     self.targetLang = self.settings.language.target.code;
                     self.charactersLimit = self.settings.charLimit;
                     self.suggestions = self.settings.suggestions;
+                    self.supportedFilesFormat = self.settings.supportedFilesFormat;
+                    self.filesTranslation = self.settings.filesTranslation;
                 }else {
                     self.error = "Cannot load /frontend/settings";
                     self.loading = false;
@@ -139,7 +148,9 @@ document.addEventListener('DOMContentLoaded', function(){
                     '',
                     'console.log(await res.json());'].join("\n");
             },
-
+            supportedFilesFormatFormatted: function() {
+                return this.supportedFilesFormat.join(', ');
+            },
             isHtml: function(){
                 return htmlRegex.test(this.inputText);
             },
@@ -299,6 +310,67 @@ document.addEventListener('DOMContentLoaded', function(){
             deleteText: function(e){
                 e.preventDefault();
                 this.inputText = this.translatedText = this.output = "";
+            },
+            switchType: function(type) {
+                this.translationType = type;
+            },
+            handleInputFile: function(e) {
+                this.inputFile = e.target.files[0];
+            },
+            removeFile: function(e) {
+              e.preventDefault()
+              this.inputFile = false;
+              this.translatedFileUrl = false;
+              this.loadingFileTranslation = false;
+            },
+            translateFile: function(e) {
+                e.preventDefault();
+
+                let self = this;
+                let translateFileRequest = new XMLHttpRequest();
+
+                translateFileRequest.open("POST", BaseUrl + "/translate_file", true);
+
+                let data = new FormData();
+                data.append("file", this.inputFile);
+                data.append("source", this.sourceLang);
+                data.append("target", this.targetLang);
+                data.append("api_key", localStorage.getItem("api_key") || "");
+
+                this.loadingFileTranslation = true
+
+                translateFileRequest.onload = function()  {
+                    if (translateFileRequest.readyState === 4 && translateFileRequest.status === 200) {
+                        try{
+                            self.loadingFileTranslation = false;
+
+                            let res = JSON.parse(this.response);
+                            if (res.translatedFileUrl){
+                                self.translatedFileUrl = res.translatedFileUrl;
+
+                                let link = document.createElement("a");
+                                link.target = "_blank";
+                                link.href = self.translatedFileUrl;
+                                link.click();
+                            }else{
+                                throw new Error(res.error || "Unknown error");
+                            }
+
+                        }catch(e){
+                            self.error = e.message;
+                            self.loadingFileTranslation = false;
+                            self.inputFile = false;
+                        }
+                    }
+                }
+
+                translateFileRequest.onerror = function() {
+                    self.error = "Error while calling /translate_file";
+                    self.loadingFileTranslation = false;
+                    self.inputFile = false;
+                };
+
+                translateFileRequest.send(data);
             }
         }
     });

app/templates/index.html

@@ -105,7 +105,10 @@
 			<div class="container">
 				<div class="row">
 					<h3 class="header center">Translation API</h3>
-
+                    <div class="col s12 mb-1 center" v-if="filesTranslation === true">
+                        <button type="button" class="btn btn-switch-type" @click="switchType('text')" :class="{'active': translationType === 'text'}"><i class="material-icons left">title</i>Translate text</button>
+                        <button type="button" class="btn btn-switch-type" @click="switchType('files')" :class="{'active': translationType === 'files'}"><i class="material-icons left">description</i>Translate files</button>
+                    </div>
 					<form class="col s12">
 						<div class="row mb-0">
 							<div class="col s6 language-select">
@@ -130,7 +133,7 @@
 							</div>
 						</div>
 
-						<div class="row">
+						<div class="row" v-if="translationType === 'text'">
 							<div class="input-field textarea-container col s6">
 								<label for="textarea1" class="sr-only">
 									Text to translate
@@ -143,7 +146,6 @@
 									<label>[[ inputText.length ]] / [[ charactersLimit ]]</label>
 								</div>
 							</div>
-
 							<div class="input-field textarea-container col s6">
 								<label for="textarea2" class="sr-only">
 									Translated text
@@ -170,13 +172,49 @@
 								</div>
 							</div>
 						</div>
+                        <div class="row" v-if="translationType === 'files'">
+                            <div class="file-dropzone">
+                                <div v-if="inputFile === false" class="dropzone-content">
+                                    <span>Supported file formats: [[ supportedFilesFormatFormatted ]]</span>
+                                    <form action="#">
+                                        <div class="file-field input-field">
+                                            <div class="btn">
+                                                <span>File</span>
+                                                <input type="file" :accept="supportedFilesFormatFormatted" @change="handleInputFile" ref="fileInputRef">
+                                            </div>
+                                            <div class="file-path-wrapper hidden">
+                                                <input class="file-path validate" type="text">
+                                            </div>
+                                        </div>
+                                    </form>
+                                </div>
+                                <div v-if="inputFile !== false" class="dropzone-content">
+                                    <div class="card">
+                                        <div class="card-content"  style="padding-right: 6px;">
+                                            <div class="row mb-0">
+                                                <div class="col s12">
+                                                    [[ inputFile.name ]]
+                                                    <button v-if="loadingFileTranslation !== true" @click="removeFile" class="btn-flat">
+                                                        <i class="material-icons">close</i>
+                                                    </button>
+                                                </div>
+                                            </div>
+                                        </div>
+                                    </div>
+                                    <button @click="translateFile" v-if="translatedFileUrl === false && loadingFileTranslation === false" class="btn">Translate</button>
+                                    <a v-if="translatedFileUrl !== false" :href="translatedFileUrl" class="btn">Download</a>
+                                    <div class="progress" v-if="loadingFileTranslation">
+                                        <div class="indeterminate"></div>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
 					</form>
-
 				</div>
 			</div>
 		</div>
 
-		<div class="section no-pad-bot">
+		<div class="section no-pad-bot" v-if="translationType !== 'files'">
 			<div class="container">
 				<div class="row center">
 					<div class="col s12 m12">

requirements.txt

@@ -12,3 +12,4 @@ polyglot==16.7.4
 appdirs==1.4.4
 APScheduler==3.7.0
 translatehtml==1.5.1
+argos-translate-files==1.0.1

setup.py

@@ -3,7 +3,7 @@
 from setuptools import setup, find_packages
 
 setup(
-    version='1.2.5',
+    version=open('VERSION').read().strip(),
     name='libretranslate',
     license='GNU Affero General Public License v3.0',
     description='Free and Open Source Machine Translation API. Self-hosted, no limits, no ties to proprietary services.',