main.py 17.3 KB
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from fastapi import (
    FastAPI,
    Depends,
    HTTPException,
    status,
    UploadFile,
    File,
    Form,
)
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from fastapi.middleware.cors import CORSMiddleware
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import os, shutil, logging, re
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from pathlib import Path
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from typing import List
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from chromadb.utils import embedding_functions
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from chromadb.utils.batch_utils import create_batches
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from langchain_community.document_loaders import (
    WebBaseLoader,
    TextLoader,
    PyPDFLoader,
    CSVLoader,
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    BSHTMLLoader,
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    Docx2txtLoader,
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    UnstructuredEPubLoader,
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    UnstructuredWordDocumentLoader,
    UnstructuredMarkdownLoader,
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    UnstructuredXMLLoader,
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    UnstructuredRSTLoader,
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    UnstructuredExcelLoader,
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)
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from langchain.text_splitter import RecursiveCharacterTextSplitter

from pydantic import BaseModel
from typing import Optional
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import mimetypes
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import uuid
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import json

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from apps.web.models.documents import (
    Documents,
    DocumentForm,
    DocumentResponse,
)
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from apps.rag.utils import query_doc, query_collection, get_embedding_model_path
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from utils.misc import (
    calculate_sha256,
    calculate_sha256_string,
    sanitize_filename,
    extract_folders_after_data_docs,
)
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from utils.utils import get_current_user, get_admin_user
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from config import (
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    SRC_LOG_LEVELS,
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    UPLOAD_DIR,
    DOCS_DIR,
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    RAG_EMBEDDING_MODEL,
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    RAG_EMBEDDING_MODEL_AUTO_UPDATE,
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    DEVICE_TYPE,
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    CHROMA_CLIENT,
    CHUNK_SIZE,
    CHUNK_OVERLAP,
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    RAG_TEMPLATE,
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)
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from constants import ERROR_MESSAGES

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log = logging.getLogger(__name__)
log.setLevel(SRC_LOG_LEVELS["RAG"])

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app = FastAPI()

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app.state.PDF_EXTRACT_IMAGES = False
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app.state.CHUNK_SIZE = CHUNK_SIZE
app.state.CHUNK_OVERLAP = CHUNK_OVERLAP
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app.state.RAG_TEMPLATE = RAG_TEMPLATE
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app.state.RAG_EMBEDDING_MODEL = RAG_EMBEDDING_MODEL
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app.state.TOP_K = 4

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app.state.sentence_transformer_ef = (
    embedding_functions.SentenceTransformerEmbeddingFunction(
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        model_name=get_embedding_model_path(
            app.state.RAG_EMBEDDING_MODEL, RAG_EMBEDDING_MODEL_AUTO_UPDATE
        ),
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        device=DEVICE_TYPE,
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    )
)
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origins = ["*"]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


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class CollectionNameForm(BaseModel):
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    collection_name: Optional[str] = "test"


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class StoreWebForm(CollectionNameForm):
    url: str

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@app.get("/")
async def get_status():
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    return {
        "status": True,
        "chunk_size": app.state.CHUNK_SIZE,
        "chunk_overlap": app.state.CHUNK_OVERLAP,
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        "template": app.state.RAG_TEMPLATE,
        "embedding_model": app.state.RAG_EMBEDDING_MODEL,
    }


@app.get("/embedding/model")
async def get_embedding_model(user=Depends(get_admin_user)):
    return {
        "status": True,
        "embedding_model": app.state.RAG_EMBEDDING_MODEL,
    }


class EmbeddingModelUpdateForm(BaseModel):
    embedding_model: str


@app.post("/embedding/model/update")
async def update_embedding_model(
    form_data: EmbeddingModelUpdateForm, user=Depends(get_admin_user)
):
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    log.info(
        f"Updating embedding model: {app.state.RAG_EMBEDDING_MODEL} to {form_data.embedding_model}"
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    )
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    try:
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        sentence_transformer_ef = (
            embedding_functions.SentenceTransformerEmbeddingFunction(
                model_name=get_embedding_model_path(form_data.embedding_model, True),
                device=DEVICE_TYPE,
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            )
        )

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        app.state.RAG_EMBEDDING_MODEL = form_data.embedding_model
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        app.state.sentence_transformer_ef = sentence_transformer_ef
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        return {
            "status": True,
            "embedding_model": app.state.RAG_EMBEDDING_MODEL,
        }
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    except Exception as e:
        log.exception(f"Problem updating embedding model: {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=ERROR_MESSAGES.DEFAULT(e),
        )
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@app.get("/config")
async def get_rag_config(user=Depends(get_admin_user)):
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    return {
        "status": True,
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        "pdf_extract_images": app.state.PDF_EXTRACT_IMAGES,
        "chunk": {
            "chunk_size": app.state.CHUNK_SIZE,
            "chunk_overlap": app.state.CHUNK_OVERLAP,
        },
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    }


class ChunkParamUpdateForm(BaseModel):
    chunk_size: int
    chunk_overlap: int


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class ConfigUpdateForm(BaseModel):
    pdf_extract_images: bool
    chunk: ChunkParamUpdateForm


@app.post("/config/update")
async def update_rag_config(form_data: ConfigUpdateForm, user=Depends(get_admin_user)):
    app.state.PDF_EXTRACT_IMAGES = form_data.pdf_extract_images
    app.state.CHUNK_SIZE = form_data.chunk.chunk_size
    app.state.CHUNK_OVERLAP = form_data.chunk.chunk_overlap
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    return {
        "status": True,
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        "pdf_extract_images": app.state.PDF_EXTRACT_IMAGES,
        "chunk": {
            "chunk_size": app.state.CHUNK_SIZE,
            "chunk_overlap": app.state.CHUNK_OVERLAP,
        },
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    }
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@app.get("/template")
async def get_rag_template(user=Depends(get_current_user)):
    return {
        "status": True,
        "template": app.state.RAG_TEMPLATE,
    }


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@app.get("/query/settings")
async def get_query_settings(user=Depends(get_admin_user)):
    return {
        "status": True,
        "template": app.state.RAG_TEMPLATE,
        "k": app.state.TOP_K,
    }
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class QuerySettingsForm(BaseModel):
    k: Optional[int] = None
    template: Optional[str] = None


@app.post("/query/settings/update")
async def update_query_settings(
    form_data: QuerySettingsForm, user=Depends(get_admin_user)
):
    app.state.RAG_TEMPLATE = form_data.template if form_data.template else RAG_TEMPLATE
    app.state.TOP_K = form_data.k if form_data.k else 4
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    return {"status": True, "template": app.state.RAG_TEMPLATE}
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class QueryDocForm(BaseModel):
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    collection_name: str
    query: str
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    k: Optional[int] = None
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@app.post("/query/doc")
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def query_doc_handler(
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    form_data: QueryDocForm,
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    user=Depends(get_current_user),
):
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    try:
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        return query_doc(
            collection_name=form_data.collection_name,
            query=form_data.query,
            k=form_data.k if form_data.k else app.state.TOP_K,
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            embedding_function=app.state.sentence_transformer_ef,
        )
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    except Exception as e:
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        log.exception(e)
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        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.DEFAULT(e),
        )
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class QueryCollectionsForm(BaseModel):
    collection_names: List[str]
    query: str
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    k: Optional[int] = None
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@app.post("/query/collection")
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def query_collection_handler(
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    form_data: QueryCollectionsForm,
    user=Depends(get_current_user),
):
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    return query_collection(
        collection_names=form_data.collection_names,
        query=form_data.query,
        k=form_data.k if form_data.k else app.state.TOP_K,
        embedding_function=app.state.sentence_transformer_ef,
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    )
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@app.post("/web")
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def store_web(form_data: StoreWebForm, user=Depends(get_current_user)):
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    # "https://www.gutenberg.org/files/1727/1727-h/1727-h.htm"
    try:
        loader = WebBaseLoader(form_data.url)
        data = loader.load()
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        collection_name = form_data.collection_name
        if collection_name == "":
            collection_name = calculate_sha256_string(form_data.url)[:63]

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        store_data_in_vector_db(data, collection_name, overwrite=True)
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        return {
            "status": True,
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            "collection_name": collection_name,
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            "filename": form_data.url,
        }
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    except Exception as e:
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        log.exception(e)
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        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.DEFAULT(e),
        )


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def store_data_in_vector_db(data, collection_name, overwrite: bool = False) -> bool:
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    text_splitter = RecursiveCharacterTextSplitter(
        chunk_size=app.state.CHUNK_SIZE,
        chunk_overlap=app.state.CHUNK_OVERLAP,
        add_start_index=True,
    )
    docs = text_splitter.split_documents(data)
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    if len(docs) > 0:
        return store_docs_in_vector_db(docs, collection_name, overwrite), None
    else:
        raise ValueError(ERROR_MESSAGES.EMPTY_CONTENT)
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def store_text_in_vector_db(
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    text, metadata, collection_name, overwrite: bool = False
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) -> bool:
    text_splitter = RecursiveCharacterTextSplitter(
        chunk_size=app.state.CHUNK_SIZE,
        chunk_overlap=app.state.CHUNK_OVERLAP,
        add_start_index=True,
    )
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    docs = text_splitter.create_documents([text], metadatas=[metadata])
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    return store_docs_in_vector_db(docs, collection_name, overwrite)


def store_docs_in_vector_db(docs, collection_name, overwrite: bool = False) -> bool:
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    texts = [doc.page_content for doc in docs]
    metadatas = [doc.metadata for doc in docs]

    try:
        if overwrite:
            for collection in CHROMA_CLIENT.list_collections():
                if collection_name == collection.name:
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                    log.info(f"deleting existing collection {collection_name}")
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                    CHROMA_CLIENT.delete_collection(name=collection_name)

        collection = CHROMA_CLIENT.create_collection(
            name=collection_name,
            embedding_function=app.state.sentence_transformer_ef,
        )

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        for batch in create_batches(
            api=CHROMA_CLIENT,
            ids=[str(uuid.uuid1()) for _ in texts],
            metadatas=metadatas,
            documents=texts,
        ):
            collection.add(*batch)

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        return True
    except Exception as e:
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        log.exception(e)
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        if e.__class__.__name__ == "UniqueConstraintError":
            return True

        return False


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def get_loader(filename: str, file_content_type: str, file_path: str):
    file_ext = filename.split(".")[-1].lower()
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    known_type = True

    known_source_ext = [
        "go",
        "py",
        "java",
        "sh",
        "bat",
        "ps1",
        "cmd",
        "js",
        "ts",
        "css",
        "cpp",
        "hpp",
        "h",
        "c",
        "cs",
        "sql",
        "log",
        "ini",
        "pl",
        "pm",
        "r",
        "dart",
        "dockerfile",
        "env",
        "php",
        "hs",
        "hsc",
        "lua",
        "nginxconf",
        "conf",
        "m",
        "mm",
        "plsql",
        "perl",
        "rb",
        "rs",
        "db2",
        "scala",
        "bash",
        "swift",
        "vue",
        "svelte",
    ]

    if file_ext == "pdf":
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        loader = PyPDFLoader(file_path, extract_images=app.state.PDF_EXTRACT_IMAGES)
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    elif file_ext == "csv":
        loader = CSVLoader(file_path)
    elif file_ext == "rst":
        loader = UnstructuredRSTLoader(file_path, mode="elements")
    elif file_ext == "xml":
        loader = UnstructuredXMLLoader(file_path)
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    elif file_ext in ["htm", "html"]:
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        loader = BSHTMLLoader(file_path, open_encoding="unicode_escape")
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    elif file_ext == "md":
        loader = UnstructuredMarkdownLoader(file_path)
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    elif file_content_type == "application/epub+zip":
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        loader = UnstructuredEPubLoader(file_path)
    elif (
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        file_content_type
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        == "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
        or file_ext in ["doc", "docx"]
    ):
        loader = Docx2txtLoader(file_path)
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    elif file_content_type in [
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        "application/vnd.ms-excel",
        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    ] or file_ext in ["xls", "xlsx"]:
        loader = UnstructuredExcelLoader(file_path)
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    elif file_ext in known_source_ext or (
        file_content_type and file_content_type.find("text/") >= 0
    ):
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        loader = TextLoader(file_path, autodetect_encoding=True)
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    else:
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        loader = TextLoader(file_path, autodetect_encoding=True)
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        known_type = False

    return loader, known_type


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@app.post("/doc")
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def store_doc(
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    collection_name: Optional[str] = Form(None),
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    file: UploadFile = File(...),
    user=Depends(get_current_user),
):
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    # "https://www.gutenberg.org/files/1727/1727-h/1727-h.htm"
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    log.info(f"file.content_type: {file.content_type}")
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    try:
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        unsanitized_filename = file.filename
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        filename = os.path.basename(unsanitized_filename)
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        file_path = f"{UPLOAD_DIR}/{filename}"
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        contents = file.file.read()
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        with open(file_path, "wb") as f:
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            f.write(contents)
            f.close()

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        f = open(file_path, "rb")
        if collection_name == None:
            collection_name = calculate_sha256(f)[:63]
        f.close()

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        loader, known_type = get_loader(filename, file.content_type, file_path)
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        data = loader.load()
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        try:
            result = store_data_in_vector_db(data, collection_name)

            if result:
                return {
                    "status": True,
                    "collection_name": collection_name,
                    "filename": filename,
                    "known_type": known_type,
                }
        except Exception as e:
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            raise HTTPException(
                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
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                detail=e,
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            )
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    except Exception as e:
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        log.exception(e)
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        if "No pandoc was found" in str(e):
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=ERROR_MESSAGES.PANDOC_NOT_INSTALLED,
            )
        else:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=ERROR_MESSAGES.DEFAULT(e),
            )
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class TextRAGForm(BaseModel):
    name: str
    content: str
    collection_name: Optional[str] = None


@app.post("/text")
def store_text(
    form_data: TextRAGForm,
    user=Depends(get_current_user),
):

    collection_name = form_data.collection_name
    if collection_name == None:
        collection_name = calculate_sha256_string(form_data.content)

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    result = store_text_in_vector_db(
        form_data.content,
        metadata={"name": form_data.name, "created_by": user.id},
        collection_name=collection_name,
    )
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    if result:
        return {"status": True, "collection_name": collection_name}
    else:
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=ERROR_MESSAGES.DEFAULT(),
        )


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@app.get("/scan")
def scan_docs_dir(user=Depends(get_admin_user)):
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    for path in Path(DOCS_DIR).rglob("./**/*"):
        try:
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            if path.is_file() and not path.name.startswith("."):
                tags = extract_folders_after_data_docs(path)
                filename = path.name
                file_content_type = mimetypes.guess_type(path)

                f = open(path, "rb")
                collection_name = calculate_sha256(f)[:63]
                f.close()

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                loader, known_type = get_loader(
                    filename, file_content_type[0], str(path)
                )
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                data = loader.load()

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                try:
                    result = store_data_in_vector_db(data, collection_name)

                    if result:
                        sanitized_filename = sanitize_filename(filename)
                        doc = Documents.get_doc_by_name(sanitized_filename)

                        if doc == None:
                            doc = Documents.insert_new_doc(
                                user.id,
                                DocumentForm(
                                    **{
                                        "name": sanitized_filename,
                                        "title": filename,
                                        "collection_name": collection_name,
                                        "filename": filename,
                                        "content": (
                                            json.dumps(
                                                {
                                                    "tags": list(
                                                        map(
                                                            lambda name: {"name": name},
                                                            tags,
                                                        )
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                                                    )
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                                                }
                                            )
                                            if len(tags)
                                            else "{}"
                                        ),
                                    }
                                ),
                            )
                except Exception as e:
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                    log.exception(e)
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                    pass
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        except Exception as e:
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            log.exception(e)
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    return True


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@app.get("/reset/db")
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def reset_vector_db(user=Depends(get_admin_user)):
    CHROMA_CLIENT.reset()
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@app.get("/reset")
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def reset(user=Depends(get_admin_user)) -> bool:
    folder = f"{UPLOAD_DIR}"
    for filename in os.listdir(folder):
        file_path = os.path.join(folder, filename)
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        try:
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            if os.path.isfile(file_path) or os.path.islink(file_path):
                os.unlink(file_path)
            elif os.path.isdir(file_path):
                shutil.rmtree(file_path)
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        except Exception as e:
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            log.error("Failed to delete %s. Reason: %s" % (file_path, e))
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    try:
        CHROMA_CLIENT.reset()
    except Exception as e:
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        log.exception(e)
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    return True