I created this to download the images in specific Discord channels.
You'll need to configure a config.json that looks like this:
{
"token" : "YOUR DISCORD BOT's API TOKEN",
"image_dir_root" : "./images",
"delay_secs" : 5,
"loop_delay_secs" : 0.1,
"channel_id" : 1188862941500539031,
"message_quantity" : 10000,
"after_id" : 0
}
And then just run it.
Images along with a JSON of the message will go in a subdirectory of images with the channel name and id.
after_id indicates that you want the messages after that particular id. Set to 0 if you want everything.
I've found that your Bot will need Administrator privileges otherwise an exception is thrown when reading channel.history, which is weird because there is a Channel History permission scoping. Without the Administrator privileges, the bot crashes. Sad.
Also, I'm not entirely sure that this Bot will gather all messages. You can't get a message quantity from the channel nor an enumeration of all the messages in the channel. Sad.
So it's a bit of a brute force thing. Set message quantity ridiculously high, and run it.