Validate option and transient name lengths
|Reported by:||chrisjean||Owned by:|
|Component:||Options, Meta APIs||Keywords:||has-patch needs-unit-tests|
The option_name column in the options table holds up to 64 characters yet there aren't any length checks to ensure that the length isn't exceeded. This leads to all sorts of odd behavior as the name will be truncated to fit, saving the option but not allowing it to be retrieved with the same name.
This issue affects all uses of the options system. A particular annoyance is transients. A transient that doesn't expire has a max name length of 53 characters yet a transient that does expire has a max name length of 45 characters. When attempting to save an expiring transient of name length between 46 and 53 characters, the transient will store but will be deleted before being used when get_transient is called due to the missing _transient_timeout_ option (since it was too long).
The core issues are that the functions don't return any type of failure condition on names that are too long and no warning is created. So, I've created a patch that addresses both of these issues.
The patch shows an example of how option and transient name length validation can be added. In order to allow users to modify the option_name column length, a new constant, WP_OPTION_LENGTH, is created with a default value of 64. This constant is checked for all length validation.
This is simply an example of how I'd like the validation to function. I'm not attached to the wording of the warnings or the name of the constant.