WIP: Add DeepL provider

dialect/providers/modules/deepl.py

@@ -0,0 +1,119 @@
+# Copyright 2024 Mufeed Ali
+# Copyright 2024 Rafael Mardojai CM
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import logging
+
+from dialect.providers.base import (
+    ProviderCapability,
+    ProviderFeature,
+    ProviderErrorCode,
+    ProviderError,
+    Translation,
+)
+from dialect.providers.soup import SoupProvider
+
+API_V = "v2"
+
+
+class Provider(SoupProvider):
+    name = 'deepl'
+    prettyname = 'DeepL'
+
+    capabilities = ProviderCapability.TRANSLATION
+    features = ProviderFeature.DETECTION | ProviderFeature.API_KEY | ProviderFeature.API_KEY_REQUIRED
+
+    defaults = {
+        # TODO: Do we want to support pro users?
+        'instance_url': 'api-free.deepl.com',
+        'api_key': '',
+        'src_langs': ['en', 'fr', 'es', 'de'],
+        'dest_langs': ['fr', 'es', 'de', 'en'],
+    }
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+        self.chars_limit = -1  # TODO: What is the limit?
+
+    @property
+    def lang_url(self):
+        # TODO: we need to extend the providers API to allow different src/dest lang lists
+        return self.format_url(self.instance_url, f'/{API_V}/languages', {'type': 'target'})
+
+    @property
+    def translate_url(self):
+        return self.format_url(self.instance_url, f'/{API_V}/translate')
+
+    @property
+    def headers(self):
+        return {'Authorization': f'DeepL-Auth-Key {self.api_key}'}
+
+    def init_trans(self, on_done, on_fail):
+        def on_response(data):
+            try:
+                for lang in data:
+                    self.add_lang(lang['language'], lang['name'])
+
+                on_done()
+
+            except Exception as exc:
+                logging.warning(exc)
+                on_fail(ProviderError(ProviderErrorCode.UNEXPECTED, str(exc)))
+
+        # Request messages
+        languages_message = self.create_message('GET', self.lang_url, headers=self.headers)
+        # Do async requests
+        self.send_and_read_and_process_response(languages_message, on_response, on_fail)
+
+    def validate_api_key(self, key, on_done, on_fail):
+        def on_response(_data):
+            valid = languages_message.get_status() == 200
+            on_done(valid)
+
+        # TODO: Is there a better endpoint for checking auth?
+        # Headers
+        headers = {'Authorization': f'DeepL-Auth-Key {key}'}
+        # Request messages
+        languages_message = self.create_message('GET', self.lang_url, headers=headers)
+        # Do async requests
+        self.send_and_read_and_process_response(languages_message, on_response, on_fail)
+
+    def translate(self, text, src, dest, on_done, on_fail):
+        def on_response(data):
+            try:
+                translations = data.get('translations')
+                detected = translations[0].get('detected_source_language')
+                translation = Translation(translations[0]['text'], (text, src, dest), detected)
+                on_done(translation)
+
+            except Exception as exc:
+                logging.warning(exc)
+                on_fail(ProviderError(ProviderErrorCode.TRANSLATION_FAILED, str(exc)))
+
+        # Request body
+        data = {
+            'text': [text],
+            'target_lang': dest,
+        }
+        if src != 'auto':
+            data['source_lang'] = src
+
+        # Request message
+        message = self.create_message('POST', self.translate_url, data, self.headers)
+        # Do async request
+        self.send_and_read_and_process_response(message, on_response, on_fail)
+
+    def check_known_errors(self, status, data):
+        message = data.get('message', '') if isinstance(data, dict) else ''
+
+        match status:
+            case 403:
+                if not self.api_key:
+                    return ProviderError(ProviderErrorCode.API_KEY_REQUIRED, message)
+                return ProviderError(ProviderErrorCode.API_KEY_INVALID, message)
+            case 456:
+                return ProviderError(ProviderErrorCode.SERVICE_LIMIT_REACHED, message)
+
+        if status != 200:
+            return ProviderError(ProviderErrorCode.UNEXPECTED, message)