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import datetime
import hashlib
import uuid
from typing import Any, Literal, Union
from flask_login import current_user
from werkzeug.exceptions import NotFound
from configs import dify_config
from constants import (
AUDIO_EXTENSIONS,
DOCUMENT_EXTENSIONS,
IMAGE_EXTENSIONS,
VIDEO_EXTENSIONS,
)
from core.file import helpers as file_helpers
from core.rag.extractor.extract_processor import ExtractProcessor
from extensions.ext_database import db
from extensions.ext_storage import storage
from models.account import Account
from models.enums import CreatedByRole
from models.model import EndUser, UploadFile
from .errors.file import FileTooLargeError, UnsupportedFileTypeError
PREVIEW_WORDS_LIMIT = 3000
class FileService:
@staticmethod
def upload_file(
*,
filename: str,
content: bytes,
mimetype: str,
user: Union[Account, EndUser, Any],
source: Literal["datasets"] | None = None,
source_url: str = "",
) -> UploadFile:
# get file extension
extension = filename.split(".")[-1].lower()
if len(filename) > 200:
filename = filename.split(".")[0][:200] + "." + extension
if source == "datasets" and extension not in DOCUMENT_EXTENSIONS:
raise UnsupportedFileTypeError()
# get file size
file_size = len(content)
# check if the file size is exceeded
if not FileService.is_file_size_within_limit(extension=extension, file_size=file_size):
raise FileTooLargeError
# generate file key
file_uuid = str(uuid.uuid4())
if isinstance(user, Account):
current_tenant_id = user.current_tenant_id
else:
# end_user
current_tenant_id = user.tenant_id
file_key = "upload_files/" + current_tenant_id + "/" + file_uuid + "." + extension
# save file to storage
storage.save(file_key, content)
# save file to db
upload_file = UploadFile(
tenant_id=current_tenant_id,
storage_type=dify_config.STORAGE_TYPE,
key=file_key,
name=filename,
size=file_size,
extension=extension,
mime_type=mimetype,
created_by_role=(CreatedByRole.ACCOUNT if isinstance(user, Account) else CreatedByRole.END_USER),
created_by=user.id,
created_at=datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None),
used=False,
hash=hashlib.sha3_256(content).hexdigest(),
source_url=source_url,
)
db.session.add(upload_file)
db.session.commit()
return upload_file
@staticmethod
def is_file_size_within_limit(*, extension: str, file_size: int) -> bool:
if extension in IMAGE_EXTENSIONS:
file_size_limit = dify_config.UPLOAD_IMAGE_FILE_SIZE_LIMIT * 1024 * 1024
elif extension in VIDEO_EXTENSIONS:
file_size_limit = dify_config.UPLOAD_VIDEO_FILE_SIZE_LIMIT * 1024 * 1024
elif extension in AUDIO_EXTENSIONS:
file_size_limit = dify_config.UPLOAD_AUDIO_FILE_SIZE_LIMIT * 1024 * 1024
else:
file_size_limit = dify_config.UPLOAD_FILE_SIZE_LIMIT * 1024 * 1024
return file_size <= file_size_limit
@staticmethod
def upload_text(text: str, text_name: str) -> UploadFile:
if len(text_name) > 200:
text_name = text_name[:200]
# user uuid as file name
file_uuid = str(uuid.uuid4())
file_key = "upload_files/" + current_user.current_tenant_id + "/" + file_uuid + ".txt"
# save file to storage
storage.save(file_key, text.encode("utf-8"))
# save file to db
upload_file = UploadFile(
tenant_id=current_user.current_tenant_id,
storage_type=dify_config.STORAGE_TYPE,
key=file_key,
name=text_name,
size=len(text),
extension="txt",
mime_type="text/plain",
created_by=current_user.id,
created_by_role=CreatedByRole.ACCOUNT,
created_at=datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None),
used=True,
used_by=current_user.id,
used_at=datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None),
)
db.session.add(upload_file)
db.session.commit()
return upload_file
@staticmethod
def get_file_preview(file_id: str):
upload_file = db.session.query(UploadFile).filter(UploadFile.id == file_id).first()
if not upload_file:
raise NotFound("File not found")
# extract text from file
extension = upload_file.extension
if extension.lower() not in DOCUMENT_EXTENSIONS:
raise UnsupportedFileTypeError()
text = ExtractProcessor.load_from_upload_file(upload_file, return_text=True)
text = text[0:PREVIEW_WORDS_LIMIT] if text else ""
return text
@staticmethod
def get_image_preview(file_id: str, timestamp: str, nonce: str, sign: str):
result = file_helpers.verify_image_signature(
upload_file_id=file_id, timestamp=timestamp, nonce=nonce, sign=sign
)
if not result:
raise NotFound("File not found or signature is invalid")
upload_file = db.session.query(UploadFile).filter(UploadFile.id == file_id).first()
if not upload_file:
raise NotFound("File not found or signature is invalid")
# extract text from file
extension = upload_file.extension
if extension.lower() not in IMAGE_EXTENSIONS:
raise UnsupportedFileTypeError()
generator = storage.load(upload_file.key, stream=True)
return generator, upload_file.mime_type
@staticmethod
def get_file_generator_by_file_id(file_id: str, timestamp: str, nonce: str, sign: str):
result = file_helpers.verify_file_signature(upload_file_id=file_id, timestamp=timestamp, nonce=nonce, sign=sign)
if not result:
raise NotFound("File not found or signature is invalid")
upload_file = db.session.query(UploadFile).filter(UploadFile.id == file_id).first()
if not upload_file:
raise NotFound("File not found or signature is invalid")
generator = storage.load(upload_file.key, stream=True)
return generator, upload_file
@staticmethod
def get_public_image_preview(file_id: str):
upload_file = db.session.query(UploadFile).filter(UploadFile.id == file_id).first()
if not upload_file:
raise NotFound("File not found or signature is invalid")
# extract text from file
extension = upload_file.extension
if extension.lower() not in IMAGE_EXTENSIONS:
raise UnsupportedFileTypeError()
generator = storage.load(upload_file.key)
return generator, upload_file.mime_type
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