dify
This commit is contained in:
604
dify/api/libs/email_i18n.py
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604
dify/api/libs/email_i18n.py
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"""
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Email Internationalization Module
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This module provides a centralized, elegant way to handle email internationalization
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in Dify. It follows Domain-Driven Design principles with proper type hints and
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eliminates the need for repetitive language switching logic.
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"""
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from dataclasses import dataclass
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from enum import StrEnum, auto
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from typing import Any, Protocol
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from flask import render_template
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from pydantic import BaseModel, Field
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from extensions.ext_mail import mail
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from services.feature_service import BrandingModel, FeatureService
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class EmailType(StrEnum):
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"""Enumeration of supported email types."""
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RESET_PASSWORD = auto()
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RESET_PASSWORD_WHEN_ACCOUNT_NOT_EXIST = auto()
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INVITE_MEMBER = auto()
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EMAIL_CODE_LOGIN = auto()
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CHANGE_EMAIL_OLD = auto()
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CHANGE_EMAIL_NEW = auto()
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CHANGE_EMAIL_COMPLETED = auto()
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OWNER_TRANSFER_CONFIRM = auto()
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OWNER_TRANSFER_OLD_NOTIFY = auto()
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OWNER_TRANSFER_NEW_NOTIFY = auto()
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ACCOUNT_DELETION_SUCCESS = auto()
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ACCOUNT_DELETION_VERIFICATION = auto()
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ENTERPRISE_CUSTOM = auto()
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QUEUE_MONITOR_ALERT = auto()
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DOCUMENT_CLEAN_NOTIFY = auto()
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EMAIL_REGISTER = auto()
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EMAIL_REGISTER_WHEN_ACCOUNT_EXIST = auto()
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RESET_PASSWORD_WHEN_ACCOUNT_NOT_EXIST_NO_REGISTER = auto()
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TRIGGER_EVENTS_LIMIT_SANDBOX = auto()
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TRIGGER_EVENTS_LIMIT_PROFESSIONAL = auto()
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TRIGGER_EVENTS_USAGE_WARNING_SANDBOX = auto()
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TRIGGER_EVENTS_USAGE_WARNING_PROFESSIONAL = auto()
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API_RATE_LIMIT_LIMIT_SANDBOX = auto()
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API_RATE_LIMIT_WARNING_SANDBOX = auto()
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class EmailLanguage(StrEnum):
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"""Supported email languages with fallback handling."""
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EN_US = "en-US"
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ZH_HANS = "zh-Hans"
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@classmethod
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def from_language_code(cls, language_code: str) -> "EmailLanguage":
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"""Convert a language code to EmailLanguage with fallback to English."""
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if language_code == "zh-Hans":
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return cls.ZH_HANS
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return cls.EN_US
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@dataclass(frozen=True)
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class EmailTemplate:
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"""Immutable value object representing an email template configuration."""
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subject: str
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template_path: str
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branded_template_path: str
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@dataclass(frozen=True)
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class EmailContent:
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"""Immutable value object containing rendered email content."""
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subject: str
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html_content: str
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template_context: dict[str, Any]
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class EmailI18nConfig(BaseModel):
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"""Configuration for email internationalization."""
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model_config = {"frozen": True, "extra": "forbid"}
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templates: dict[EmailType, dict[EmailLanguage, EmailTemplate]] = Field(
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default_factory=dict, description="Mapping of email types to language-specific templates"
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)
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def get_template(self, email_type: EmailType, language: EmailLanguage) -> EmailTemplate:
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"""Get template configuration for specific email type and language."""
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type_templates = self.templates.get(email_type)
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if not type_templates:
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raise ValueError(f"No templates configured for email type: {email_type}")
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template = type_templates.get(language)
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if not template:
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# Fallback to English if specific language not found
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template = type_templates.get(EmailLanguage.EN_US)
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if not template:
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raise ValueError(f"No template found for {email_type} in {language} or English")
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return template
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class EmailRenderer(Protocol):
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"""Protocol for email template renderers."""
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def render_template(self, template_path: str, **context: Any) -> str:
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"""Render email template with given context."""
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...
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class FlaskEmailRenderer:
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"""Flask-based email template renderer."""
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def render_template(self, template_path: str, **context: Any) -> str:
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"""Render email template using Flask's render_template."""
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return render_template(template_path, **context)
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class BrandingService(Protocol):
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"""Protocol for branding service abstraction."""
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def get_branding_config(self) -> BrandingModel:
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"""Get current branding configuration."""
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...
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class FeatureBrandingService:
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"""Feature service based branding implementation."""
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def get_branding_config(self) -> BrandingModel:
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"""Get branding configuration from feature service."""
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return FeatureService.get_system_features().branding
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class EmailSender(Protocol):
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"""Protocol for email sending abstraction."""
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def send_email(self, to: str, subject: str, html_content: str):
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"""Send email with given parameters."""
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...
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class FlaskMailSender:
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"""Flask-Mail based email sender."""
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def send_email(self, to: str, subject: str, html_content: str):
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"""Send email using Flask-Mail."""
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if mail.is_inited():
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mail.send(to=to, subject=subject, html=html_content)
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class EmailI18nService:
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"""
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Main service for internationalized email handling.
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This service provides a clean API for sending internationalized emails
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with proper branding support and template management.
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"""
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def __init__(
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self,
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config: EmailI18nConfig,
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renderer: EmailRenderer,
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branding_service: BrandingService,
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sender: EmailSender,
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):
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self._config = config
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self._renderer = renderer
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self._branding_service = branding_service
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self._sender = sender
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def send_email(
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self,
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email_type: EmailType,
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language_code: str,
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to: str,
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template_context: dict[str, Any] | None = None,
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):
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"""
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Send internationalized email with branding support.
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Args:
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email_type: Type of email to send
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language_code: Target language code
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to: Recipient email address
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template_context: Additional context for template rendering
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"""
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if template_context is None:
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template_context = {}
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language = EmailLanguage.from_language_code(language_code)
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email_content = self._render_email_content(email_type, language, template_context)
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self._sender.send_email(to=to, subject=email_content.subject, html_content=email_content.html_content)
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def send_change_email(
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self,
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language_code: str,
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to: str,
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code: str,
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phase: str,
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):
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"""
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Send change email notification with phase-specific handling.
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Args:
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language_code: Target language code
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to: Recipient email address
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code: Verification code
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phase: Either 'old_email' or 'new_email'
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"""
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if phase == "old_email":
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email_type = EmailType.CHANGE_EMAIL_OLD
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elif phase == "new_email":
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email_type = EmailType.CHANGE_EMAIL_NEW
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else:
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raise ValueError(f"Invalid phase: {phase}. Must be 'old_email' or 'new_email'")
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self.send_email(
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email_type=email_type,
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language_code=language_code,
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to=to,
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template_context={
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"to": to,
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"code": code,
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},
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)
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def send_raw_email(
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self,
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to: str | list[str],
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subject: str,
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html_content: str,
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):
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"""
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Send a raw email directly without template processing.
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This method is provided for backward compatibility with legacy email
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sending that uses pre-rendered HTML content (e.g., enterprise emails
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with custom templates).
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Args:
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to: Recipient email address(es)
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subject: Email subject
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html_content: Pre-rendered HTML content
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"""
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if isinstance(to, list):
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for recipient in to:
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self._sender.send_email(to=recipient, subject=subject, html_content=html_content)
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else:
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self._sender.send_email(to=to, subject=subject, html_content=html_content)
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def _render_email_content(
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self,
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email_type: EmailType,
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language: EmailLanguage,
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template_context: dict[str, Any],
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) -> EmailContent:
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"""Render email content with branding and internationalization."""
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template_config = self._config.get_template(email_type, language)
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branding = self._branding_service.get_branding_config()
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# Determine template path based on branding
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template_path = template_config.branded_template_path if branding.enabled else template_config.template_path
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# Prepare template context with branding information
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full_context = {
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**template_context,
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"branding_enabled": branding.enabled,
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"application_title": branding.application_title if branding.enabled else "Dify",
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}
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# Render template
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html_content = self._renderer.render_template(template_path, **full_context)
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# Apply templating to subject with all context variables
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subject = template_config.subject
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try:
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subject = subject.format(**full_context)
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except KeyError:
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# If template variables are missing, fall back to basic formatting
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if branding.enabled and "{application_title}" in subject:
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subject = subject.format(application_title=branding.application_title)
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return EmailContent(
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subject=subject,
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html_content=html_content,
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template_context=full_context,
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)
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def create_default_email_config() -> EmailI18nConfig:
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"""Create default email i18n configuration with all supported templates."""
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templates: dict[EmailType, dict[EmailLanguage, EmailTemplate]] = {
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EmailType.RESET_PASSWORD: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Set Your {application_title} Password",
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template_path="reset_password_mail_template_en-US.html",
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branded_template_path="without-brand/reset_password_mail_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="设置您的 {application_title} 密码",
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template_path="reset_password_mail_template_zh-CN.html",
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branded_template_path="without-brand/reset_password_mail_template_zh-CN.html",
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),
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},
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EmailType.INVITE_MEMBER: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Join {application_title} Workspace Now",
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template_path="invite_member_mail_template_en-US.html",
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branded_template_path="without-brand/invite_member_mail_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="立即加入 {application_title} 工作空间",
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template_path="invite_member_mail_template_zh-CN.html",
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branded_template_path="without-brand/invite_member_mail_template_zh-CN.html",
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),
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},
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EmailType.EMAIL_CODE_LOGIN: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="{application_title} Login Code",
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template_path="email_code_login_mail_template_en-US.html",
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branded_template_path="without-brand/email_code_login_mail_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="{application_title} 登录验证码",
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template_path="email_code_login_mail_template_zh-CN.html",
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branded_template_path="without-brand/email_code_login_mail_template_zh-CN.html",
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),
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},
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EmailType.CHANGE_EMAIL_OLD: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Check your current email",
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template_path="change_mail_confirm_old_template_en-US.html",
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branded_template_path="without-brand/change_mail_confirm_old_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="检测您现在的邮箱",
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template_path="change_mail_confirm_old_template_zh-CN.html",
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branded_template_path="without-brand/change_mail_confirm_old_template_zh-CN.html",
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),
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},
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EmailType.CHANGE_EMAIL_NEW: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Confirm your new email address",
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template_path="change_mail_confirm_new_template_en-US.html",
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branded_template_path="without-brand/change_mail_confirm_new_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="确认您的邮箱地址变更",
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template_path="change_mail_confirm_new_template_zh-CN.html",
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branded_template_path="without-brand/change_mail_confirm_new_template_zh-CN.html",
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),
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},
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EmailType.CHANGE_EMAIL_COMPLETED: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Your login email has been changed",
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template_path="change_mail_completed_template_en-US.html",
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branded_template_path="without-brand/change_mail_completed_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="您的登录邮箱已更改",
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template_path="change_mail_completed_template_zh-CN.html",
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branded_template_path="without-brand/change_mail_completed_template_zh-CN.html",
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),
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},
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EmailType.OWNER_TRANSFER_CONFIRM: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Verify Your Request to Transfer Workspace Ownership",
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template_path="transfer_workspace_owner_confirm_template_en-US.html",
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branded_template_path="without-brand/transfer_workspace_owner_confirm_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="验证您转移工作空间所有权的请求",
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template_path="transfer_workspace_owner_confirm_template_zh-CN.html",
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branded_template_path="without-brand/transfer_workspace_owner_confirm_template_zh-CN.html",
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),
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},
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EmailType.OWNER_TRANSFER_OLD_NOTIFY: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Workspace ownership has been transferred",
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template_path="transfer_workspace_old_owner_notify_template_en-US.html",
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branded_template_path="without-brand/transfer_workspace_old_owner_notify_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="工作区所有权已转移",
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template_path="transfer_workspace_old_owner_notify_template_zh-CN.html",
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branded_template_path="without-brand/transfer_workspace_old_owner_notify_template_zh-CN.html",
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),
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},
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EmailType.OWNER_TRANSFER_NEW_NOTIFY: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="You are now the owner of {WorkspaceName}",
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template_path="transfer_workspace_new_owner_notify_template_en-US.html",
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branded_template_path="without-brand/transfer_workspace_new_owner_notify_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="您现在是 {WorkspaceName} 的所有者",
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template_path="transfer_workspace_new_owner_notify_template_zh-CN.html",
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branded_template_path="without-brand/transfer_workspace_new_owner_notify_template_zh-CN.html",
|
||||
),
|
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},
|
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EmailType.ACCOUNT_DELETION_SUCCESS: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Your Dify.AI Account Has Been Successfully Deleted",
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template_path="delete_account_success_template_en-US.html",
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branded_template_path="delete_account_success_template_en-US.html",
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),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="您的 Dify.AI 账户已成功删除",
|
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template_path="delete_account_success_template_zh-CN.html",
|
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branded_template_path="delete_account_success_template_zh-CN.html",
|
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),
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},
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EmailType.ACCOUNT_DELETION_VERIFICATION: {
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EmailLanguage.EN_US: EmailTemplate(
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subject="Dify.AI Account Deletion and Verification",
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template_path="delete_account_code_email_template_en-US.html",
|
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branded_template_path="delete_account_code_email_template_en-US.html",
|
||||
),
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EmailLanguage.ZH_HANS: EmailTemplate(
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subject="Dify.AI 账户删除和验证",
|
||||
template_path="delete_account_code_email_template_zh-CN.html",
|
||||
branded_template_path="delete_account_code_email_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.QUEUE_MONITOR_ALERT: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
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subject="Alert: Dataset Queue pending tasks exceeded the limit",
|
||||
template_path="queue_monitor_alert_email_template_en-US.html",
|
||||
branded_template_path="queue_monitor_alert_email_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="警报：数据集队列待处理任务超过限制",
|
||||
template_path="queue_monitor_alert_email_template_zh-CN.html",
|
||||
branded_template_path="queue_monitor_alert_email_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.DOCUMENT_CLEAN_NOTIFY: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="Dify Knowledge base auto disable notification",
|
||||
template_path="clean_document_job_mail_template-US.html",
|
||||
branded_template_path="clean_document_job_mail_template-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="Dify 知识库自动禁用通知",
|
||||
template_path="clean_document_job_mail_template_zh-CN.html",
|
||||
branded_template_path="clean_document_job_mail_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.TRIGGER_EVENTS_LIMIT_SANDBOX: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="You’ve reached your Sandbox Trigger Events limit",
|
||||
template_path="trigger_events_limit_template_en-US.html",
|
||||
branded_template_path="without-brand/trigger_events_limit_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="您的 Sandbox 触发事件额度已用尽",
|
||||
template_path="trigger_events_limit_template_zh-CN.html",
|
||||
branded_template_path="without-brand/trigger_events_limit_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.TRIGGER_EVENTS_LIMIT_PROFESSIONAL: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="You’ve reached your monthly Trigger Events limit",
|
||||
template_path="trigger_events_limit_template_en-US.html",
|
||||
branded_template_path="without-brand/trigger_events_limit_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="您的月度触发事件额度已用尽",
|
||||
template_path="trigger_events_limit_template_zh-CN.html",
|
||||
branded_template_path="without-brand/trigger_events_limit_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.TRIGGER_EVENTS_USAGE_WARNING_SANDBOX: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="You’re nearing your Sandbox Trigger Events limit",
|
||||
template_path="trigger_events_usage_warning_template_en-US.html",
|
||||
branded_template_path="without-brand/trigger_events_usage_warning_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="您的 Sandbox 触发事件额度接近上限",
|
||||
template_path="trigger_events_usage_warning_template_zh-CN.html",
|
||||
branded_template_path="without-brand/trigger_events_usage_warning_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.TRIGGER_EVENTS_USAGE_WARNING_PROFESSIONAL: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="You’re nearing your Monthly Trigger Events limit",
|
||||
template_path="trigger_events_usage_warning_template_en-US.html",
|
||||
branded_template_path="without-brand/trigger_events_usage_warning_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="您的月度触发事件额度接近上限",
|
||||
template_path="trigger_events_usage_warning_template_zh-CN.html",
|
||||
branded_template_path="without-brand/trigger_events_usage_warning_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.API_RATE_LIMIT_LIMIT_SANDBOX: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="You’ve reached your API Rate Limit",
|
||||
template_path="api_rate_limit_limit_template_en-US.html",
|
||||
branded_template_path="without-brand/api_rate_limit_limit_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="您的 API 速率额度已用尽",
|
||||
template_path="api_rate_limit_limit_template_zh-CN.html",
|
||||
branded_template_path="without-brand/api_rate_limit_limit_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.API_RATE_LIMIT_WARNING_SANDBOX: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="You’re nearing your API Rate Limit",
|
||||
template_path="api_rate_limit_warning_template_en-US.html",
|
||||
branded_template_path="without-brand/api_rate_limit_warning_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="您的 API 速率额度接近上限",
|
||||
template_path="api_rate_limit_warning_template_zh-CN.html",
|
||||
branded_template_path="without-brand/api_rate_limit_warning_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.EMAIL_REGISTER: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="Register Your {application_title} Account",
|
||||
template_path="register_email_template_en-US.html",
|
||||
branded_template_path="without-brand/register_email_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="注册您的 {application_title} 账户",
|
||||
template_path="register_email_template_zh-CN.html",
|
||||
branded_template_path="without-brand/register_email_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.EMAIL_REGISTER_WHEN_ACCOUNT_EXIST: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="Register Your {application_title} Account",
|
||||
template_path="register_email_when_account_exist_template_en-US.html",
|
||||
branded_template_path="without-brand/register_email_when_account_exist_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="注册您的 {application_title} 账户",
|
||||
template_path="register_email_when_account_exist_template_zh-CN.html",
|
||||
branded_template_path="without-brand/register_email_when_account_exist_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.RESET_PASSWORD_WHEN_ACCOUNT_NOT_EXIST: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="Reset Your {application_title} Password",
|
||||
template_path="reset_password_mail_when_account_not_exist_template_en-US.html",
|
||||
branded_template_path="without-brand/reset_password_mail_when_account_not_exist_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="重置您的 {application_title} 密码",
|
||||
template_path="reset_password_mail_when_account_not_exist_template_zh-CN.html",
|
||||
branded_template_path="without-brand/reset_password_mail_when_account_not_exist_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
EmailType.RESET_PASSWORD_WHEN_ACCOUNT_NOT_EXIST_NO_REGISTER: {
|
||||
EmailLanguage.EN_US: EmailTemplate(
|
||||
subject="Reset Your {application_title} Password",
|
||||
template_path="reset_password_mail_when_account_not_exist_no_register_template_en-US.html",
|
||||
branded_template_path="without-brand/reset_password_mail_when_account_not_exist_no_register_template_en-US.html",
|
||||
),
|
||||
EmailLanguage.ZH_HANS: EmailTemplate(
|
||||
subject="重置您的 {application_title} 密码",
|
||||
template_path="reset_password_mail_when_account_not_exist_no_register_template_zh-CN.html",
|
||||
branded_template_path="without-brand/reset_password_mail_when_account_not_exist_no_register_template_zh-CN.html",
|
||||
),
|
||||
},
|
||||
}
|
||||
|
||||
return EmailI18nConfig(templates=templates)
|
||||
|
||||
|
||||
# Singleton instance for application-wide use
|
||||
def get_default_email_i18n_service() -> EmailI18nService:
|
||||
"""Get configured email i18n service with default dependencies."""
|
||||
config = create_default_email_config()
|
||||
renderer = FlaskEmailRenderer()
|
||||
branding_service = FeatureBrandingService()
|
||||
sender = FlaskMailSender()
|
||||
|
||||
return EmailI18nService(
|
||||
config=config,
|
||||
renderer=renderer,
|
||||
branding_service=branding_service,
|
||||
sender=sender,
|
||||
)
|
||||
|
||||
|
||||
# Global instance
|
||||
_email_i18n_service: EmailI18nService | None = None
|
||||
|
||||
|
||||
def get_email_i18n_service() -> EmailI18nService:
|
||||
"""Get global email i18n service instance."""
|
||||
global _email_i18n_service
|
||||
if _email_i18n_service is None:
|
||||
_email_i18n_service = get_default_email_i18n_service()
|
||||
return _email_i18n_service
|
||||
Reference in New Issue
Block a user