I added a new plugin to the plugins page today. It's called BotBlock, and it's just simple attempt to keep robots from posting comments.
I wrote this because, for the past several days, I've been getting a lot of comment spam. The messages were comming in groups of two to six messages at a time, had varying content, and came from varying IP addresses. However, the general format of all the posts was the same (short fake greeting, followed by lines of URLs and two or three word descriptions) and they all targeted the same blog entry. So obviously these were either being posted by a robot or a very stupid human.
Thus I implemented this stop-gap solution. Basically, it just adds a hidden field to the comment form that contains a hash value based on your LnBlog configuration and the client IP address. When the client submits a comment, it checks this hash. If it's either missing or doesn't match the calculated value, the comment is rejected.
Of course, this depends on the bot being relatively stupid and the spammer not being motivated enough to figure out your specific configuration. A determined spammer could bypass this protection without too much effort, which is why I call this a stop-gap. However for small-time blogs like mine, which aren't worth the effort to crack, this solves the immediate problem.
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