Reddit: Checksum validation to reduce reposts

[DerBejijing]

Reposts sent by the bot inside the reddit channels have always been a problem, but I have an idea to at least reduce them.

I would suggest to add the following feature to the bot:
When it tries to post an image, it calculates a checksum of the image and compares it against a list of collected checksums. If the checksum already exists, it won't post it. The collected checksums may of course be deleted after a certain period of time.
While that won't entirely solve the problem, it will surely reduce the amount of reposts and I would greatly appreciate that.

Thank you in advance

Tasks:

• Save md5 checksum of each sent picture in redis
• Create a config to allow the admins to set the cache time
• Check the redis cache before each post, if the checksum of the picture to be set already exists