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Add File.target validation and escaping #222

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Add File.target validation and escaping #222

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4620366
Add `File.target` validation and escaping
Chan-Siu-Man Oct 25, 2024
1da6b63
Cut `std.contract.all_of` by expanding
Chan-Siu-Man Oct 25, 2024
48ff98a
Use `std.contract.from_{validator → predicate}`
Chan-Siu-Man Oct 25, 2024
c4cfe48
Format nickel
Chan-Siu-Man Oct 25, 2024
6d80d90
Use `"…"`→`$'…'` for escaping, and restyle code
Chan-Siu-Man Oct 26, 2024
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29 changes: 27 additions & 2 deletions lib/files.ncl
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Original file line number Diff line number Diff line change
@@ -1,11 +1,31 @@
let nix = import "./nix-interop/nix.ncl" in
let RelativePath =
std.contract.from_predicate
(
fun x =>
x
|> std.string.characters
|> std.array.first != "/"
)
in
let NoParentTraversal =
std.contract.from_predicate
(
fun x =>
x
|> std.string.split "/"
|> std.array.all ((!=) "..")
)
in
let File = {
target
| doc m%"
The file to write to.
If null, defaults to the attribute name of the file.
"%
| String
| std.string.NonEmpty # avoids ""
| RelativePath # avoids "/etc/passwd"
| NoParentTraversal # avoids "../../../../../../../etc/passwd"
| optional,
content
| doc m%"
Expand Down Expand Up @@ -72,7 +92,12 @@ let regenerate_files | Files -> nix.derivation.Derivation
}
file_descr.materialisation_method
in
nix-s%"regenerate_function "%{copy_command}" "%{file_descr.file}" "%{file_descr.target}""%
let shell_escape = fun path =>
path
|> std.string.replace "\\" "\\\\"
|> std.string.replace m%"'"% m%"\'"%
in
nix-s%"regenerate_function '%{copy_command}' '%{file_descr.file}' $'%{shell_escape file_descr.target}'"%
in
let regenerate_files = nix-s%"
%{regenerate_function}
Expand Down
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