Hi Marc.
On Fri, May 7, 2021 at 11:32 PM M.-A. Lemburg
PEP 501 was deferred because more learning and time was wanted after introducing f-strings. Now that it has been 5 years, I wonder what the possibilities of revisiting PEP 501 are.
I recently had the experience of using javascript "tagged template
On 07.05.2021 21:40, Nick Humrich wrote: literals" and
was able to build a SQL string parser that is impossible to have SQL injection with. This is done by having the database connection object only accept a certain type of object, and all sql tagged template literals become that object. Because variables are lazy evaluated, the template function can turn all dynamic inputs into parameters in a SQL query. It is impossible for a dev to accidentally add a user imputed string as a literal. PEP 501 already mentions how templates (i-strings?) can solve injection. This is a very incredible goal. Injection has been the #1 vulnerability on OWASP for over 10 years, and has been in the top 5 the entire time OWASP has existed (almost 20 years now). We have an opportunity to completely remove injection attacks.
I think you ought to not use SQL injection as the primary argument for i-strings.
The DB API highly recommends passing any arguments to a SQL to the database via binding parameters and let the database do the binding of the SQL template on the server side.
Sending those SQL templates and the parameters separately to the database is not only safer, but also a lot more efficient and allows for the database to much better manage query plan caching and reuse.
Interesting. When you do that in Python, does that mean something like %s in the SQL query, and then after the query a list of arguments in the same order as the %s tokens? Because if that's the case, maybe it'll be better to use an i-string there, and NOT have the Python layer format the string, but use that i-string to send the parameters separately to the database. It might be easier to read that way.
Even with i-strings we should *not* recommend doing the binding of SQL strings in the Python application.
There are other use cases where lazy binding can be useful, though, e.g. when you don't know whether the interpolation will actually get used (logging) or where you may want to render the template in a different or extended namespace. -- Marc-Andre Lemburg eGenix.com
Professional Python Services directly from the Experts (#1, May 07 2021)
Python Projects, Coaching and Support ... https://www.egenix.com/ Python Product Development ... https://consulting.egenix.com/
::: We implement business ideas - efficiently in both time and costs :::
eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 https://www.egenix.com/company/contact/ https://www.malemburg.com/
_______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-leave@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/3OILH2... Code of Conduct: http://python.org/psf/codeofconduct/