heroku+python+linebotapiで画像を保存できない

Question

python 3.6, herokuでラインボット作っております。
やりたいことは、写真を受け取り、同じ写真を返すことだけです。
以下のようなコードを書いたのですが、エラーが発生します。
何かご存知の方がいらっしゃれば、よろしくお願いします。

from flask import Flask, request, abort
from linebot import LineBotApi, WebhookHandler
from linebot.exceptions import InvalidSignatureError
from linebot.models import MessageEvent, TextMessage, TextSendMessage, ImageMessage, ImageSendMessage

from hashing import average_hash

import os
import re
import pandas as pd
import codecs
import urllib
import datetime
import requests
import json


app = Flask(__name__)

YOUR_CHANNEL_ACCESS_TOKEN = os.environ["YOUR_CHANNEL_ACCESS_TOKEN"]
YOUR_CHANNEL_SECRET = os.environ["YOUR_CHANNEL_SECRET"]

line_bot_api = LineBotApi(YOUR_CHANNEL_ACCESS_TOKEN)
handler = WebhookHandler(YOUR_CHANNEL_SECRET)

FQDN = 'https://??????????????????.herokuapp.com/'


@app.route("/callback", methods=['POST'])
def callback():
    signature = request.headers['X-Line-Signature']
    body = request.get_data(as_text=True)
    app.logger.info("Request body: " + body)
    try:
        handler.handle(body, signature)
    except InvalidSignatureError:
        abort(400)
    return 'OK'

@handler.add(MessageEvent, message=TextMessage)
def handle_message(event):
    line_bot_api.reply_message(
        event.reply_token, TextSendMessage(text=event.message.text)
    )

@handler.add(MessageEvent, message=ImageMessage)
def handle_image_message(event):
    message_id = event.message.id
    message_content = line_bot_api.get_message_content(message_id)
    img = message_content.content

    P = "static/"+message_id+".jpg"
    mode = 'a' if os.path.exists(P) else 'wb'
    with open(P,mode) as f:
        f.write(img)

    line_bot_api.reply_message(
        event.reply_token,
        ImageSendMessage(
            original_content_url = FQDN + "static/" + message_id + ".jpg",
            preview_content_url = FQDN + "static/" + message_id + ".jpg"
        )
    )

if __name__ == "__main__":
    port = int(os.getenv("PORT", 5000))
    app.run(host="0.0.0.0", port=port)
    #app.run()
    

エラー

linebot.exceptions.LineBotApiError: LineBotApiError: status_code=400, request_id=8cf151ca-a8dd-402c-a642-bcd93a15686e, error_response={"details": [{"message": "May not be empty", "property": "messages[0].previewImageUrl"}], "message": "The request body has 1 error(s)"}, headers={'Server': 'openresty', 'Content-Type': 'application/json', 'x-line-request-id': '8cf151ca-a8dd-402c-a642-bcd93a15686e', 'x-content-type-options': 'nosniff', 'x-xss-protection': '1; mode=block', 'x-frame-options': 'DENY', 'Content-Length': '129', 'Expires': 'Wed, 31 Mar 2021 09:57:46 GMT', 'Cache-Control': 'max-age=0, no-cache, no-store', 'Pragma': 'no-cache', 'Date': 'Wed, 31 Mar 2021 09:57:46 GMT', 'Connection': 'close'}

Answer 1

ImageSendMessageに渡すパラメータは preview_image_url が正しいです。

Comments

[sysysysy]

解決しました！ありがとうございます！