niming_backend/blueprints/article.py

import time
import hashlib

import magic
from flask import Blueprint, request, jsonify
from google.protobuf.message import DecodeError

from utils import logger, pgclass, setting_loader
from utils.dbhelper import db, solo_article_fetcher, multi_article_fetcher, solo_file_fetcher, solo_article_remover
from utils.misc import error
from protobuf_files import niming_pb2

"""
TODO:
- IG post ( Po文、刪文、只PO本體文章 )

- log 的方式之後要重新設計 > 正規化
- IP Record (deploy之前配合rev proxy)
- gunicorn
- 檔案完成，但是再看看要不要讓發文者持sha256存取自己發的文的檔案
"""

article = Blueprint('article', __name__)

# 匿名文列表
@article.route('/list', methods = ["GET"])
def listing():
    res, code = multi_article_fetcher("general", request.args.get("start"), request.args.get("count"))
    return res, code

# 獲取匿名文附檔
@article.route("/file/<int:id>", methods=["GET"])
def getfile(id:int):
    resp, code = solo_file_fetcher("general", id)
    return resp, code

# 只有發文者可以看到的獲取指定文章
# 只有發文者可以做到的刪除文章
@article.route("/own/<sha256>", methods = ["GET", "DELETE"])
def owner_getarticle(sha256:str):
    table = pgclass.SQLarticle
    ftab = pgclass.SQLfile

    # 獲取指定文章
    if request.method == "GET":
        resfn, code = solo_article_fetcher("owner", key=sha256)
        return jsonify(resfn), code
    # 刪除指定文章跟他們的留言、檔案
    elif request.method == "DELETE":
        result, code = solo_article_remover("general", hash=sha256)
        if "error" in result: return jsonify(result), code

        logger.logger("delpost", "Delete post (id=%d with comments %s): last_status=%s"
                      %(result["id"], str(result["rcl"]), str(result["mark"])))
        return jsonify({"result":"OK"}), code

# 獲取指定文章
@article.route("/<int:id>", methods = ["GET"])
def getarticle(id:int):
    resfn, code = solo_article_fetcher("general", key=id)
    return jsonify(resfn), code

# 上傳文章 / 留言
@article.route("/", methods = ["POST"])
def posting():
    # flow:
    #   ctx -> hash -> reference -> file -> IP -> IG -> mark -> post | -> log
    # loadset
    opt = setting_loader.loadset()
    chk_before_post = opt["Check_Before_Post"]
    maxword = opt["Niming_Max_Word"]

    # protobuf parse
    recv = niming_pb2.DataMessage()
    try: recv.ParseFromString(request.data)
    except DecodeError: return error("Protobuf decode error"), 400

    # content
    ctx = str(recv.ctx)
    if len(ctx) == 0 or len(ctx) > maxword: # length check
        return error("no content or too many words"), 400

    # hash
    seed = ctx + str(time.time())
    hash = hashlib.sha256(seed.encode()).hexdigest()

    # SQL start
    table = pgclass.SQLarticle
    with db.getsession() as session:
        # reference
        ref = int(recv.ref)
        if not (ref == 0):   # 如果ref不是0
            # 檢查是不是指向存在的文章
            chk = session.query(table).filter(table.id == ref, table.mark == "visible").first()
            if chk is None: return error("Invalid Reference"), 400
            # 檢查指向的文章是否也是留言
            if not(chk.reference is None): return error("Invalid Reference"), 400
        else:
            ref = None
    
        # file processing
        files = recv.files
        # check - size
        atts = opt["Attachment_Count"]
        sizelimit = opt["Attachment_Size"]
        if len(files) > atts: return error("Too many files"), 400
        for f in files:
            if len(f) <= 0 or len(f) > sizelimit: return error("File size error"), 400
        # check - mimetype
        allowed_mime = opt["Allowed_MIME"]
        for f in files:
            mime = magic.Magic(mime=True)
            type = mime.from_buffer(f)
            if not(type in allowed_mime): return error("File format error"), 400
        # run processor
        ftab = pgclass.SQLfile
        for f in files:
            mime = magic.Magic(mime=True)
            type = mime.from_buffer(f)
            fsql = ftab(reference = hash, binary = f, type = type)
            session.add(fsql)

        # IP
        ip = request.remote_addr

        # ig posting
        if chk_before_post:
            igid = None
        # Go posting
        igid = None
        # Coming Soon...

        # mark
        if chk_before_post: mark = "pending"
        else: mark = "visible"

        # posting
        data = table(hash = hash, ctx = ctx, igid = igid, mark = mark, reference = ref, ip = ip)
        session.add(data)
        session.commit()

    result, code = solo_article_fetcher(role="owner", key=hash)
    # logger
    logger.logger("newpost", "New post (id=%d point to %s): %s"%(result["id"], ref, mark))
    return result, code