MaxKB/apps/knowledge/serializers/file.py

# coding=utf-8

import uuid_utils.compat as uuid
from django.db.models import QuerySet
from django.http import HttpResponse
from django.utils.translation import gettext_lazy as _
from rest_framework import serializers

from common.exception.app_exception import NotFound404
from knowledge.models import File
from tools.serializers.tool import UploadedFileField

mime_types = {
    "html": "text/html", "htm": "text/html", "shtml": "text/html", "css": "text/css", "xml": "text/xml",
    "gif": "image/gif", "jpeg": "image/jpeg", "jpg": "image/jpeg", "js": "application/javascript",
    "atom": "application/atom+xml", "rss": "application/rss+xml", "mml": "text/mathml", "txt": "text/plain",
    "jad": "text/vnd.sun.j2me.app-descriptor", "wml": "text/vnd.wap.wml", "htc": "text/x-component",
    "avif": "image/avif", "png": "image/png", "svg": "image/svg+xml", "svgz": "image/svg+xml",
    "tif": "image/tiff", "tiff": "image/tiff", "wbmp": "image/vnd.wap.wbmp", "webp": "image/webp",
    "ico": "image/x-icon", "jng": "image/x-jng", "bmp": "image/x-ms-bmp", "woff": "font/woff",
    "woff2": "font/woff2", "jar": "application/java-archive", "war": "application/java-archive",
    "ear": "application/java-archive", "json": "application/json", "hqx": "application/mac-binhex40",
    "doc": "application/msword", "pdf": "application/pdf", "ps": "application/postscript",
    "docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
    "eps": "application/postscript", "ai": "application/postscript", "rtf": "application/rtf",
    "m3u8": "application/vnd.apple.mpegurl", "kml": "application/vnd.google-earth.kml+xml",
    "kmz": "application/vnd.google-earth.kmz", "xls": "application/vnd.ms-excel",
    "eot": "application/vnd.ms-fontobject", "ppt": "application/vnd.ms-powerpoint",
    "odg": "application/vnd.oasis.opendocument.graphics",
    "odp": "application/vnd.oasis.opendocument.presentation",
    "ods": "application/vnd.oasis.opendocument.spreadsheet", "odt": "application/vnd.oasis.opendocument.text",
    "wmlc": "application/vnd.wap.wmlc", "wasm": "application/wasm", "7z": "application/x-7z-compressed",
    "cco": "application/x-cocoa", "jardiff": "application/x-java-archive-diff",
    "jnlp": "application/x-java-jnlp-file", "run": "application/x-makeself", "pl": "application/x-perl",
    "pm": "application/x-perl", "prc": "application/x-pilot", "pdb": "application/x-pilot",
    "rar": "application/x-rar-compressed", "rpm": "application/x-redhat-package-manager",
    "sea": "application/x-sea", "swf": "application/x-shockwave-flash", "sit": "application/x-stuffit",
    "tcl": "application/x-tcl", "tk": "application/x-tcl", "der": "application/x-x509-ca-cert",
    "pem": "application/x-x509-ca-cert", "crt": "application/x-x509-ca-cert",
    "xpi": "application/x-xpinstall", "xhtml": "application/xhtml+xml", "xspf": "application/xspf+xml",
    "zip": "application/zip", "bin": "application/octet-stream", "exe": "application/octet-stream",
    "dll": "application/octet-stream", "deb": "application/octet-stream", "dmg": "application/octet-stream",
    "iso": "application/octet-stream", "img": "application/octet-stream", "msi": "application/octet-stream",
    "msp": "application/octet-stream", "msm": "application/octet-stream", "mid": "audio/midi",
    "midi": "audio/midi", "kar": "audio/midi", "mp3": "audio/mpeg", "ogg": "audio/ogg", "m4a": "audio/x-m4a",
    "ra": "audio/x-realaudio", "3gpp": "video/3gpp", "3gp": "video/3gpp", "ts": "video/mp2t",
    "mp4": "video/mp4", "mpeg": "video/mpeg", "mpg": "video/mpeg", "mov": "video/quicktime",
    "webm": "video/webm", "flv": "video/x-flv", "m4v": "video/x-m4v", "mng": "video/x-mng",
    "asx": "video/x-ms-asf", "asf": "video/x-ms-asf", "wmv": "video/x-ms-wmv", "avi": "video/x-msvideo"
}


class FileSerializer(serializers.Serializer):
    file = UploadedFileField(required=True, label=_('file'))
    meta = serializers.JSONField(required=False, allow_null=True)

    def upload(self, with_valid=True):
        if with_valid:
            self.is_valid(raise_exception=True)
        meta = self.data.get('meta', None)
        if not meta:
            meta = {'debug': True}
        file_id = meta.get('file_id', uuid.uuid7())
        file = File(id=file_id, file_name=self.data.get('file').name, meta=meta)
        file.save(self.data.get('file').read())
        return f'/api/file/{file_id}'

    class Operate(serializers.Serializer):
        id = serializers.UUIDField(required=True)

        def get(self, with_valid=True):
            if with_valid:
                self.is_valid(raise_exception=True)
            file_id = self.data.get('id')
            file = QuerySet(File).filter(id=file_id).first()
            if file is None:
                raise NotFound404(404, _('File not found'))
            # 如果是音频文件，直接返回文件流
            file_type = file.file_name.split(".")[-1]
            if file_type in ['mp3', 'wav', 'ogg', 'aac']:
                return HttpResponse(
                    file.get_bytes(),
                    status=200,
                    headers={
                        'Content-Type': f'audio/{file_type}',
                        'Content-Disposition': 'attachment; filename="{}"'.format(file.file_name)
                    }
                )
            return HttpResponse(
                file.get_bytes(),
                status=200,
                headers={'Content-Type': mime_types.get(file_type, 'text/plain')}
            )

        def delete(self):
            self.is_valid(raise_exception=True)
            file_id = self.data.get('id')
            file = QuerySet(File).filter(id=file_id).first()
            if file is not None:
                file.delete()
            return True