Add command to enable/disable specific embeds #33
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The new command "/embed" allows users/groups to enable/disable embeds of specific websites, among the supported ones.
The syntax is "embed website on/off".
This new feature was made possible using Redis, where the bot stores the unique chat ID and its respective preferences.
By default all the values are set to "1", which means that all the supported websites are filtered.
The bot also creates a "local" dictionary containing a copy of the most recent data from Redis, so whenever the bot has to decide whether filtering a specific URL or not it doesn't need to query the database.
Whenever the user changes a filter the database is updated alongside the local dictionary.