dify

dify/api/constants/languages.py

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+language_timezone_mapping = {
+    "en-US": "America/New_York",
+    "zh-Hans": "Asia/Shanghai",
+    "zh-Hant": "Asia/Taipei",
+    "pt-BR": "America/Sao_Paulo",
+    "es-ES": "Europe/Madrid",
+    "fr-FR": "Europe/Paris",
+    "de-DE": "Europe/Berlin",
+    "ja-JP": "Asia/Tokyo",
+    "ko-KR": "Asia/Seoul",
+    "ru-RU": "Europe/Moscow",
+    "it-IT": "Europe/Rome",
+    "uk-UA": "Europe/Kyiv",
+    "vi-VN": "Asia/Ho_Chi_Minh",
+    "ro-RO": "Europe/Bucharest",
+    "pl-PL": "Europe/Warsaw",
+    "hi-IN": "Asia/Kolkata",
+    "tr-TR": "Europe/Istanbul",
+    "fa-IR": "Asia/Tehran",
+    "sl-SI": "Europe/Ljubljana",
+    "th-TH": "Asia/Bangkok",
+    "id-ID": "Asia/Jakarta",
+}
+
+languages = list(language_timezone_mapping.keys())
+
+
+def supported_language(lang):
+    if lang in languages:
+        return lang
+
+    error = f"{lang} is not a valid language."
+    raise ValueError(error)
+
+
+def get_valid_language(lang: str | None) -> str:
+    if lang and lang in languages:
+        return lang
+    return languages[0]