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  • SQL query field can't begin by a comment · 9 ✖

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  • OWNER · 9 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
1293939737 https://github.com/simonw/datasette/issues/1860#issuecomment-1293939737 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NH_QZ simonw 9599 2022-10-27T18:57:37Z 2022-10-27T18:57:37Z OWNER

The new code is now live at https://latest.datasette.io/fixtures

 
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 SQL query field can't begin by a comment 1424378012  
1293928738 https://github.com/simonw/datasette/issues/1860#issuecomment-1293928738 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NH8ki simonw 9599 2022-10-27T18:46:31Z 2022-10-27T18:46:31Z OWNER

I think mine has a better pattern for handling /* ... anything in here that isn't */ ... */

 
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 SQL query field can't begin by a comment 1424378012  
1293928230 https://github.com/simonw/datasette/issues/1860#issuecomment-1293928230 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NH8cm simonw 9599 2022-10-27T18:46:03Z 2022-10-27T18:46:03Z OWNER 
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 SQL query field can't begin by a comment 1424378012  
1293926417 https://github.com/simonw/datasette/issues/1860#issuecomment-1293926417 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NH8AR simonw 9599 2022-10-27T18:44:20Z 2022-10-27T18:45:21Z OWNER

Hah, I just came up with this one - we were clearly working on this at the same time!

^\s*((?:\-\-.*?\n\s*)|(?:\/\*((?!\*\/)[\s\S])*\*\/)\s*)*\s*select\b

https://www.debuggex.com/r/Rbw-UWD9PdOU2GyO

 
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 SQL query field can't begin by a comment 1424378012  
1292685478 https://github.com/simonw/datasette/issues/1860#issuecomment-1292685478 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NDNCm simonw 9599 2022-10-26T21:42:35Z 2022-10-26T21:42:35Z OWNER

That's deployed to https://latest.datasette.io/ now - some examples:

 
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 SQL query field can't begin by a comment 1424378012  
1292679567 https://github.com/simonw/datasette/issues/1860#issuecomment-1292679567 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NDLmP simonw 9599 2022-10-26T21:36:25Z 2022-10-26T21:36:25Z OWNER

I'm never 100% sure how to tell if a regular expression includes a nasty denial of service attack - are there any inputs that could cause this new regex to execute in quadratic time or similar?

 
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 SQL query field can't begin by a comment 1424378012  
1292678657 https://github.com/simonw/datasette/issues/1860#issuecomment-1292678657 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NDLYB simonw 9599 2022-10-26T21:35:23Z 2022-10-26T21:35:37Z OWNER 
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 SQL query field can't begin by a comment 1424378012  
1292674919 https://github.com/simonw/datasette/issues/1860#issuecomment-1292674919 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NDKdn simonw 9599 2022-10-26T21:31:22Z 2022-10-26T21:31:22Z OWNER

I'm experimenting with this: ```python

Allow SQL to start with a / / or -- comment

comment_re = ( # Start of string, then any amount of whitespace r'^(\s' + # Comment that starts with -- and ends at a newline r'(?:--.?\n\s)' + # Comment that starts with / and ends with / r'|(?:/*[\s\S]?*/)' + # Whitespace r')\s' )

allowed_sql_res = [ re.compile(comment_re + r"select\b"), re.compile(comment_re + r"explain\s+select\b"), re.compile(comment_re + r"explain\s+query\s+plan\s+select\b"), re.compile(comment_re + r"with\b"), re.compile(comment_re + r"explain\s+with\b"), re.compile(comment_re + r"explain\s+query\s+plan\s+with\b"), ] ``` This should allow any number of comments of either type as a suffix to the allowed SQL patterns.

Needs extensive unit tests!

I'm not massively worried if it has a flaw in it though, since this is part of Datasette's defense in depth: if a non-SELECT query sneaks through it still shouldn't be able to cause any damage as the database connection is read-only or immutable.

 
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 SQL query field can't begin by a comment 1424378012  
1292659986 https://github.com/simonw/datasette/issues/1860#issuecomment-1292659986 https://api.github.com/repos/simonw/datasette/issues/1860 IC_kwDOBm6k_c5NDG0S simonw 9599 2022-10-26T21:14:26Z 2022-10-26T21:15:22Z OWNER

Yeah we should fix this.

https://www.sqlite.org/lang_comment.html - SQLite also supports -- style comments.

I like how explicit the documentation is here:

SQL comments begin with two consecutive "-" characters (ASCII 0x2d) and extend up to and including the next newline character (ASCII 0x0a) or until the end of input, whichever comes first.

C-style comments begin with "/" and extend up to and including the next "/" character pair or until the end of input, whichever comes first. C-style comments can span multiple lines. 

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 SQL query field can't begin by a comment 1424378012  

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