ragflow/api/apps/document_app.py

#
#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License
#
import json
import os.path
import pathlib
import re
from pathlib import Path

import flask
from flask import request
from flask_login import current_user, login_required

from api import settings
from api.constants import FILE_NAME_LEN_LIMIT, IMG_BASE64_PREFIX
from api.db import VALID_FILE_TYPES, VALID_TASK_STATUS, FileSource, FileType, ParserType, TaskStatus
from api.db.db_models import File, Task
from api.db.services import duplicate_name
from api.db.services.document_service import DocumentService, doc_upload_and_parse
from api.db.services.file2document_service import File2DocumentService
from api.db.services.file_service import FileService
from api.db.services.knowledgebase_service import KnowledgebaseService
from api.db.services.task_service import TaskService, queue_tasks
from api.db.services.user_service import UserTenantService
from api.utils import get_uuid
from api.utils.api_utils import (
    get_data_error_result,
    get_json_result,
    server_error_response,
    validate_request,
)
from api.utils.file_utils import filename_type, get_project_base_directory, thumbnail
from api.utils.web_utils import html2pdf, is_valid_url
from deepdoc.parser.html_parser import RAGFlowHtmlParser
from rag.nlp import search
from rag.utils.storage_factory import STORAGE_IMPL


@manager.route("/upload", methods=["POST"])  # noqa: F821
@login_required
@validate_request("kb_id")
def upload():
    kb_id = request.form.get("kb_id")
    if not kb_id:
        return get_json_result(data=False, message='Lack of "KB ID"', code=settings.RetCode.ARGUMENT_ERROR)
    if "file" not in request.files:
        return get_json_result(data=False, message="No file part!", code=settings.RetCode.ARGUMENT_ERROR)

    file_objs = request.files.getlist("file")
    for file_obj in file_objs:
        if file_obj.filename == "":
            return get_json_result(data=False, message="No file selected!", code=settings.RetCode.ARGUMENT_ERROR)
        if len(file_obj.filename.encode("utf-8")) > FILE_NAME_LEN_LIMIT:
            return get_json_result(data=False, message=f"File name must be {FILE_NAME_LEN_LIMIT} bytes or less.", code=settings.RetCode.ARGUMENT_ERROR)

    e, kb = KnowledgebaseService.get_by_id(kb_id)
    if not e:
        raise LookupError("Can't find this knowledgebase!")
    err, files = FileService.upload_document(kb, file_objs, current_user.id)

    if err:
        return get_json_result(data=files, message="\n".join(err), code=settings.RetCode.SERVER_ERROR)

    if not files:
        return get_json_result(data=files, message="There seems to be an issue with your file format. Please verify it is correct and not corrupted.", code=settings.RetCode.DATA_ERROR)
    files = [f[0] for f in files]  # remove the blob

    return get_json_result(data=files)


@manager.route("/web_crawl", methods=["POST"])  # noqa: F821
@login_required
@validate_request("kb_id", "name", "url")
def web_crawl():
    kb_id = request.form.get("kb_id")
    if not kb_id:
        return get_json_result(data=False, message='Lack of "KB ID"', code=settings.RetCode.ARGUMENT_ERROR)
    name = request.form.get("name")
    url = request.form.get("url")
    if not is_valid_url(url):
        return get_json_result(data=False, message="The URL format is invalid", code=settings.RetCode.ARGUMENT_ERROR)
    e, kb = KnowledgebaseService.get_by_id(kb_id)
    if not e:
        raise LookupError("Can't find this knowledgebase!")

    blob = html2pdf(url)
    if not blob:
        return server_error_response(ValueError("Download failure."))

    root_folder = FileService.get_root_folder(current_user.id)
    pf_id = root_folder["id"]
    FileService.init_knowledgebase_docs(pf_id, current_user.id)
    kb_root_folder = FileService.get_kb_folder(current_user.id)
    kb_folder = FileService.new_a_file_from_kb(kb.tenant_id, kb.name, kb_root_folder["id"])

    try:
        filename = duplicate_name(DocumentService.query, name=name + ".pdf", kb_id=kb.id)
        filetype = filename_type(filename)
        if filetype == FileType.OTHER.value:
            raise RuntimeError("This type of file has not been supported yet!")

        location = filename
        while STORAGE_IMPL.obj_exist(kb_id, location):
            location += "_"
        STORAGE_IMPL.put(kb_id, location, blob)
        doc = {
            "id": get_uuid(),
            "kb_id": kb.id,
            "parser_id": kb.parser_id,
            "parser_config": kb.parser_config,
            "created_by": current_user.id,
            "type": filetype,
            "name": filename,
            "location": location,
            "size": len(blob),
            "thumbnail": thumbnail(filename, blob),
            "suffix": Path(filename).suffix.lstrip("."),
        }
        if doc["type"] == FileType.VISUAL:
            doc["parser_id"] = ParserType.PICTURE.value
        if doc["type"] == FileType.AURAL:
            doc["parser_id"] = ParserType.AUDIO.value
        if re.search(r"\.(ppt|pptx|pages)$", filename):
            doc["parser_id"] = ParserType.PRESENTATION.value
        if re.search(r"\.(eml)$", filename):
            doc["parser_id"] = ParserType.EMAIL.value
        DocumentService.insert(doc)
        FileService.add_file_from_kb(doc, kb_folder["id"], kb.tenant_id)
    except Exception as e:
        return server_error_response(e)
    return get_json_result(data=True)


@manager.route("/create", methods=["POST"])  # noqa: F821
@login_required
@validate_request("name", "kb_id")
def create():
    req = request.json
    kb_id = req["kb_id"]
    if not kb_id:
        return get_json_result(data=False, message='Lack of "KB ID"', code=settings.RetCode.ARGUMENT_ERROR)
    if len(req["name"].encode("utf-8")) > FILE_NAME_LEN_LIMIT:
        return get_json_result(data=False, message=f"File name must be {FILE_NAME_LEN_LIMIT} bytes or less.", code=settings.RetCode.ARGUMENT_ERROR)

    if req["name"].strip() == "":
        return get_json_result(data=False, message="File name can't be empty.", code=settings.RetCode.ARGUMENT_ERROR)
    req["name"] = req["name"].strip()

    try:
        e, kb = KnowledgebaseService.get_by_id(kb_id)
        if not e:
            return get_data_error_result(message="Can't find this knowledgebase!")

        if DocumentService.query(name=req["name"], kb_id=kb_id):
            return get_data_error_result(message="Duplicated document name in the same knowledgebase.")

        doc = DocumentService.insert(
            {
                "id": get_uuid(),
                "kb_id": kb.id,
                "parser_id": kb.parser_id,
                "parser_config": kb.parser_config,
                "created_by": current_user.id,
                "type": FileType.VIRTUAL,
                "name": req["name"],
                "suffix": Path(req["name"]).suffix.lstrip("."),
                "location": "",
                "size": 0,
            }
        )
        return get_json_result(data=doc.to_json())
    except Exception as e:
        return server_error_response(e)


@manager.route("/list", methods=["POST"])  # noqa: F821
@login_required
def list_docs():
    kb_id = request.args.get("kb_id")
    if not kb_id:
        return get_json_result(data=False, message='Lack of "KB ID"', code=settings.RetCode.ARGUMENT_ERROR)
    tenants = UserTenantService.query(user_id=current_user.id)
    for tenant in tenants:
        if KnowledgebaseService.query(tenant_id=tenant.tenant_id, id=kb_id):
            break
    else:
        return get_json_result(data=False, message="Only owner of knowledgebase authorized for this operation.", code=settings.RetCode.OPERATING_ERROR)
    keywords = request.args.get("keywords", "")

    page_number = int(request.args.get("page", 0))
    items_per_page = int(request.args.get("page_size", 0))
    orderby = request.args.get("orderby", "create_time")
    if request.args.get("desc", "true").lower() == "false":
        desc = False
    else:
        desc = True

    req = request.get_json()

    run_status = req.get("run_status", [])
    if run_status:
        invalid_status = {s for s in run_status if s not in VALID_TASK_STATUS}
        if invalid_status:
            return get_data_error_result(message=f"Invalid filter run status conditions: {', '.join(invalid_status)}")

    types = req.get("types", [])
    if types:
        invalid_types = {t for t in types if t not in VALID_FILE_TYPES}
        if invalid_types:
            return get_data_error_result(message=f"Invalid filter conditions: {', '.join(invalid_types)} type{'s' if len(invalid_types) > 1 else ''}")

    suffix = req.get("suffix", [])

    try:
        docs, tol = DocumentService.get_by_kb_id(kb_id, page_number, items_per_page, orderby, desc, keywords, run_status, types, suffix)

        for doc_item in docs:
            if doc_item["thumbnail"] and not doc_item["thumbnail"].startswith(IMG_BASE64_PREFIX):
                doc_item["thumbnail"] = f"/v1/document/image/{kb_id}-{doc_item['thumbnail']}"

        return get_json_result(data={"total": tol, "docs": docs})
    except Exception as e:
        return server_error_response(e)


@manager.route("/filter", methods=["POST"])  # noqa: F821
@login_required
def get_filter():
    req = request.get_json()

    kb_id = req.get("kb_id")
    if not kb_id:
        return get_json_result(data=False, message='Lack of "KB ID"', code=settings.RetCode.ARGUMENT_ERROR)
    tenants = UserTenantService.query(user_id=current_user.id)
    for tenant in tenants:
        if KnowledgebaseService.query(tenant_id=tenant.tenant_id, id=kb_id):
            break
    else:
        return get_json_result(data=False, message="Only owner of knowledgebase authorized for this operation.", code=settings.RetCode.OPERATING_ERROR)

    keywords = req.get("keywords", "")

    suffix = req.get("suffix", [])

    run_status = req.get("run_status", [])
    if run_status:
        invalid_status = {s for s in run_status if s not in VALID_TASK_STATUS}
        if invalid_status:
            return get_data_error_result(message=f"Invalid filter run status conditions: {', '.join(invalid_status)}")

    types = req.get("types", [])
    if types:
        invalid_types = {t for t in types if t not in VALID_FILE_TYPES}
        if invalid_types:
            return get_data_error_result(message=f"Invalid filter conditions: {', '.join(invalid_types)} type{'s' if len(invalid_types) > 1 else ''}")

    try:
        filter, total = DocumentService.get_filter_by_kb_id(kb_id, keywords, run_status, types, suffix)
        return get_json_result(data={"total": total, "filter": filter})
    except Exception as e:
        return server_error_response(e)


@manager.route("/infos", methods=["POST"])  # noqa: F821
@login_required
def docinfos():
    req = request.json
    doc_ids = req["doc_ids"]
    for doc_id in doc_ids:
        if not DocumentService.accessible(doc_id, current_user.id):
            return get_json_result(data=False, message="No authorization.", code=settings.RetCode.AUTHENTICATION_ERROR)
    docs = DocumentService.get_by_ids(doc_ids)
    return get_json_result(data=list(docs.dicts()))


@manager.route("/thumbnails", methods=["GET"])  # noqa: F821
# @login_required
def thumbnails():
    doc_ids = request.args.get("doc_ids").split(",")
    if not doc_ids:
        return get_json_result(data=False, message='Lack of "Document ID"', code=settings.RetCode.ARGUMENT_ERROR)

    try:
        docs = DocumentService.get_thumbnails(doc_ids)

        for doc_item in docs:
            if doc_item["thumbnail"] and not doc_item["thumbnail"].startswith(IMG_BASE64_PREFIX):
                doc_item["thumbnail"] = f"/v1/document/image/{doc_item['kb_id']}-{doc_item['thumbnail']}"

        return get_json_result(data={d["id"]: d["thumbnail"] for d in docs})
    except Exception as e:
        return server_error_response(e)


@manager.route("/change_status", methods=["POST"])  # noqa: F821
@login_required
@validate_request("doc_ids", "status")
def change_status():
    req = request.get_json()
    doc_ids = req.get("doc_ids", [])
    status = str(req.get("status", ""))

    if status not in ["0", "1"]:
        return get_json_result(data=False, message='"Status" must be either 0 or 1!', code=settings.RetCode.ARGUMENT_ERROR)

    result = {}
    for doc_id in doc_ids:
        if not DocumentService.accessible(doc_id, current_user.id):
            result[doc_id] = {"error": "No authorization."}
            continue

        try:
            e, doc = DocumentService.get_by_id(doc_id)
            if not e:
                result[doc_id] = {"error": "No authorization."}
                continue
            e, kb = KnowledgebaseService.get_by_id(doc.kb_id)
            if not e:
                result[doc_id] = {"error": "Can't find this knowledgebase!"}
                continue
            if not DocumentService.update_by_id(doc_id, {"status": str(status)}):
                result[doc_id] = {"error": "Database error (Document update)!"}
                continue

            status_int = int(status)
            if not settings.docStoreConn.update({"doc_id": doc_id}, {"available_int": status_int}, search.index_name(kb.tenant_id), doc.kb_id):
                result[doc_id] = {"error": "Database error (docStore update)!"}
            result[doc_id] = {"status": status}
        except Exception as e:
            result[doc_id] = {"error": f"Internal server error: {str(e)}"}

    return get_json_result(data=result)


@manager.route("/rm", methods=["POST"])  # noqa: F821
@login_required
@validate_request("doc_id")
def rm():
    req = request.json
    doc_ids = req["doc_id"]
    if isinstance(doc_ids, str):
        doc_ids = [doc_ids]

    for doc_id in doc_ids:
        if not DocumentService.accessible4deletion(doc_id, current_user.id):
            return get_json_result(data=False, message="No authorization.", code=settings.RetCode.AUTHENTICATION_ERROR)

    root_folder = FileService.get_root_folder(current_user.id)
    pf_id = root_folder["id"]
    FileService.init_knowledgebase_docs(pf_id, current_user.id)
    errors = ""
    kb_table_num_map = {}
    for doc_id in doc_ids:
        try:
            e, doc = DocumentService.get_by_id(doc_id)
            if not e:
                return get_data_error_result(message="Document not found!")
            tenant_id = DocumentService.get_tenant_id(doc_id)
            if not tenant_id:
                return get_data_error_result(message="Tenant not found!")

            b, n = File2DocumentService.get_storage_address(doc_id=doc_id)

            TaskService.filter_delete([Task.doc_id == doc_id])
            if not DocumentService.remove_document(doc, tenant_id):
                return get_data_error_result(message="Database error (Document removal)!")

            f2d = File2DocumentService.get_by_document_id(doc_id)
            deleted_file_count = 0
            if f2d:
                deleted_file_count = FileService.filter_delete([File.source_type == FileSource.KNOWLEDGEBASE, File.id == f2d[0].file_id])
            File2DocumentService.delete_by_document_id(doc_id)
            if deleted_file_count > 0:
                STORAGE_IMPL.rm(b, n)

            doc_parser = doc.parser_id
            if doc_parser == ParserType.TABLE:
                kb_id = doc.kb_id
                if kb_id not in kb_table_num_map:
                    counts = DocumentService.count_by_kb_id(kb_id=kb_id, keywords="", run_status=[TaskStatus.DONE], types=[])
                    kb_table_num_map[kb_id] = counts
                kb_table_num_map[kb_id] -= 1
                if kb_table_num_map[kb_id] <= 0:
                    KnowledgebaseService.delete_field_map(kb_id)
        except Exception as e:
            errors += str(e)

    if errors:
        return get_json_result(data=False, message=errors, code=settings.RetCode.SERVER_ERROR)

    return get_json_result(data=True)


@manager.route("/run", methods=["POST"])  # noqa: F821
@login_required
@validate_request("doc_ids", "run")
def run():
    req = request.json
    for doc_id in req["doc_ids"]:
        if not DocumentService.accessible(doc_id, current_user.id):
            return get_json_result(data=False, message="No authorization.", code=settings.RetCode.AUTHENTICATION_ERROR)
    try:
        kb_table_num_map = {}
        for id in req["doc_ids"]:
            info = {"run": str(req["run"]), "progress": 0}
            if str(req["run"]) == TaskStatus.RUNNING.value and req.get("delete", False):
                info["progress_msg"] = ""
                info["chunk_num"] = 0
                info["token_num"] = 0

            e, doc = DocumentService.get_by_id(id)
            if not e:
                return get_data_error_result(message="Document not found!")
            if doc.run == TaskStatus.DONE.value:
                DocumentService.clear_chunk_num_when_rerun(doc.id)

            DocumentService.update_by_id(id, info)
            tenant_id = DocumentService.get_tenant_id(id)
            if not tenant_id:
                return get_data_error_result(message="Tenant not found!")
            e, doc = DocumentService.get_by_id(id)
            if not e:
                return get_data_error_result(message="Document not found!")
            if req.get("delete", False):
                TaskService.filter_delete([Task.doc_id == id])
                if settings.docStoreConn.indexExist(search.index_name(tenant_id), doc.kb_id):
                    settings.docStoreConn.delete({"doc_id": id}, search.index_name(tenant_id), doc.kb_id)

            if str(req["run"]) == TaskStatus.RUNNING.value:
                e, doc = DocumentService.get_by_id(id)
                doc = doc.to_dict()
                doc["tenant_id"] = tenant_id

                doc_parser = doc.get("parser_id", ParserType.NAIVE)
                if doc_parser == ParserType.TABLE:
                    kb_id = doc.get("kb_id")
                    if not kb_id:
                        continue
                    if kb_id not in kb_table_num_map:
                        count = DocumentService.count_by_kb_id(kb_id=kb_id, keywords="", run_status=[TaskStatus.DONE], types=[])
                        kb_table_num_map[kb_id] = count
                        if kb_table_num_map[kb_id] <= 0:
                            KnowledgebaseService.delete_field_map(kb_id)
                bucket, name = File2DocumentService.get_storage_address(doc_id=doc["id"])
                queue_tasks(doc, bucket, name, 0)

        return get_json_result(data=True)
    except Exception as e:
        return server_error_response(e)


@manager.route("/rename", methods=["POST"])  # noqa: F821
@login_required
@validate_request("doc_id", "name")
def rename():
    req = request.json
    if not DocumentService.accessible(req["doc_id"], current_user.id):
        return get_json_result(data=False, message="No authorization.", code=settings.RetCode.AUTHENTICATION_ERROR)
    try:
        e, doc = DocumentService.get_by_id(req["doc_id"])
        if not e:
            return get_data_error_result(message="Document not found!")
        if pathlib.Path(req["name"].lower()).suffix != pathlib.Path(doc.name.lower()).suffix:
            return get_json_result(data=False, message="The extension of file can't be changed", code=settings.RetCode.ARGUMENT_ERROR)
        if len(req["name"].encode("utf-8")) > FILE_NAME_LEN_LIMIT:
            return get_json_result(data=False, message=f"File name must be {FILE_NAME_LEN_LIMIT} bytes or less.", code=settings.RetCode.ARGUMENT_ERROR)

        for d in DocumentService.query(name=req["name"], kb_id=doc.kb_id):
            if d.name == req["name"]:
                return get_data_error_result(message="Duplicated document name in the same knowledgebase.")

        if not DocumentService.update_by_id(req["doc_id"], {"name": req["name"]}):
            return get_data_error_result(message="Database error (Document rename)!")

        informs = File2DocumentService.get_by_document_id(req["doc_id"])
        if informs:
            e, file = FileService.get_by_id(informs[0].file_id)
            FileService.update_by_id(file.id, {"name": req["name"]})

        return get_json_result(data=True)
    except Exception as e:
        return server_error_response(e)


@manager.route("/get/<doc_id>", methods=["GET"])  # noqa: F821
# @login_required
def get(doc_id):
    try:
        e, doc = DocumentService.get_by_id(doc_id)
        if not e:
            return get_data_error_result(message="Document not found!")

        b, n = File2DocumentService.get_storage_address(doc_id=doc_id)
        response = flask.make_response(STORAGE_IMPL.get(b, n))

        ext = re.search(r"\.([^.]+)$", doc.name)
        if ext:
            if doc.type == FileType.VISUAL.value:
                response.headers.set("Content-Type", "image/%s" % ext.group(1))
            else:
                response.headers.set("Content-Type", "application/%s" % ext.group(1))
        return response
    except Exception as e:
        return server_error_response(e)


@manager.route("/change_parser", methods=["POST"])  # noqa: F821
@login_required
@validate_request("doc_id", "parser_id")
def change_parser():
    req = request.json

    if not DocumentService.accessible(req["doc_id"], current_user.id):
        return get_json_result(data=False, message="No authorization.", code=settings.RetCode.AUTHENTICATION_ERROR)
    try:
        e, doc = DocumentService.get_by_id(req["doc_id"])
        if not e:
            return get_data_error_result(message="Document not found!")
        if doc.parser_id.lower() == req["parser_id"].lower():
            if "parser_config" in req:
                if req["parser_config"] == doc.parser_config:
                    return get_json_result(data=True)
            else:
                return get_json_result(data=True)

        if (doc.type == FileType.VISUAL and req["parser_id"] != "picture") or (re.search(r"\.(ppt|pptx|pages)$", doc.name) and req["parser_id"] != "presentation"):
            return get_data_error_result(message="Not supported yet!")

        e = DocumentService.update_by_id(doc.id, {"parser_id": req["parser_id"], "progress": 0, "progress_msg": "", "run": TaskStatus.UNSTART.value})
        if not e:
            return get_data_error_result(message="Document not found!")
        if "parser_config" in req:
            DocumentService.update_parser_config(doc.id, req["parser_config"])
        if doc.token_num > 0:
            e = DocumentService.increment_chunk_num(doc.id, doc.kb_id, doc.token_num * -1, doc.chunk_num * -1, doc.process_duration * -1)
            if not e:
                return get_data_error_result(message="Document not found!")
            tenant_id = DocumentService.get_tenant_id(req["doc_id"])
            if not tenant_id:
                return get_data_error_result(message="Tenant not found!")
            if settings.docStoreConn.indexExist(search.index_name(tenant_id), doc.kb_id):
                settings.docStoreConn.delete({"doc_id": doc.id}, search.index_name(tenant_id), doc.kb_id)

        return get_json_result(data=True)
    except Exception as e:
        return server_error_response(e)


@manager.route("/image/<image_id>", methods=["GET"])  # noqa: F821
# @login_required
def get_image(image_id):
    try:
        arr = image_id.split("-")
        if len(arr) != 2:
            return get_data_error_result(message="Image not found.")
        bkt, nm = image_id.split("-")
        response = flask.make_response(STORAGE_IMPL.get(bkt, nm))
        response.headers.set("Content-Type", "image/JPEG")
        return response
    except Exception as e:
        return server_error_response(e)


@manager.route("/upload_and_parse", methods=["POST"])  # noqa: F821
@login_required
@validate_request("conversation_id")
def upload_and_parse():
    if "file" not in request.files:
        return get_json_result(data=False, message="No file part!", code=settings.RetCode.ARGUMENT_ERROR)

    file_objs = request.files.getlist("file")
    for file_obj in file_objs:
        if file_obj.filename == "":
            return get_json_result(data=False, message="No file selected!", code=settings.RetCode.ARGUMENT_ERROR)

    doc_ids = doc_upload_and_parse(request.form.get("conversation_id"), file_objs, current_user.id)

    return get_json_result(data=doc_ids)


@manager.route("/parse", methods=["POST"])  # noqa: F821
@login_required
def parse():
    url = request.json.get("url") if request.json else ""
    if url:
        if not is_valid_url(url):
            return get_json_result(data=False, message="The URL format is invalid", code=settings.RetCode.ARGUMENT_ERROR)
        download_path = os.path.join(get_project_base_directory(), "logs/downloads")
        os.makedirs(download_path, exist_ok=True)
        from seleniumwire.webdriver import Chrome, ChromeOptions

        options = ChromeOptions()
        options.add_argument("--headless")
        options.add_argument("--disable-gpu")
        options.add_argument("--no-sandbox")
        options.add_argument("--disable-dev-shm-usage")
        options.add_experimental_option("prefs", {"download.default_directory": download_path, "download.prompt_for_download": False, "download.directory_upgrade": True, "safebrowsing.enabled": True})
        driver = Chrome(options=options)
        driver.get(url)
        res_headers = [r.response.headers for r in driver.requests if r and r.response]
        if len(res_headers) > 1:
            sections = RAGFlowHtmlParser().parser_txt(driver.page_source)
            driver.quit()
            return get_json_result(data="\n".join(sections))

        class File:
            filename: str
            filepath: str

            def __init__(self, filename, filepath):
                self.filename = filename
                self.filepath = filepath

            def read(self):
                with open(self.filepath, "rb") as f:
                    return f.read()

        r = re.search(r"filename=\"([^\"]+)\"", str(res_headers))
        if not r or not r.group(1):
            return get_json_result(data=False, message="Can't not identify downloaded file", code=settings.RetCode.ARGUMENT_ERROR)
        f = File(r.group(1), os.path.join(download_path, r.group(1)))
        txt = FileService.parse_docs([f], current_user.id)
        return get_json_result(data=txt)

    if "file" not in request.files:
        return get_json_result(data=False, message="No file part!", code=settings.RetCode.ARGUMENT_ERROR)

    file_objs = request.files.getlist("file")
    txt = FileService.parse_docs(file_objs, current_user.id)

    return get_json_result(data=txt)


@manager.route("/set_meta", methods=["POST"])  # noqa: F821
@login_required
@validate_request("doc_id", "meta")
def set_meta():
    req = request.json
    if not DocumentService.accessible(req["doc_id"], current_user.id):
        return get_json_result(data=False, message="No authorization.", code=settings.RetCode.AUTHENTICATION_ERROR)
    try:
        meta = json.loads(req["meta"])
    except Exception as e:
        return get_json_result(data=False, message=f"Json syntax error: {e}", code=settings.RetCode.ARGUMENT_ERROR)
    if not isinstance(meta, dict):
        return get_json_result(data=False, message='Meta data should be in Json map format, like {"key": "value"}', code=settings.RetCode.ARGUMENT_ERROR)

    try:
        e, doc = DocumentService.get_by_id(req["doc_id"])
        if not e:
            return get_data_error_result(message="Document not found!")

        if not DocumentService.update_by_id(req["doc_id"], {"meta_fields": meta}):
            return get_data_error_result(message="Database error (meta updates)!")

        return get_json_result(data=True)
    except Exception as e:
        return server_error_response(e)