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(.module:
[lux #*
["." io (#+ IO)]
["jvm" host (#+ import:)]
[control
[monad (#+ do)]]
[data
[number (#+ hex)]
["." product]
["." maybe]
["." error (#+ Error)]
["." text
format
["." encoding]]
[format
["." context (#+ Context)]]
[collection
["." array (#+ Array)]
["." list ("#/." fold functor)]
["." dictionary]]]
[tool
[compiler
["." host]]]
[world
["." console (#+ Console)]]])
## https://en.wikipedia.org/wiki/Code_injection#Shell_injection
(def: windows?
(-> Text Bit)
(text.starts-with? "windows"))
(def: (sanitize-command windows?)
(-> Bit (-> Text Text))
(let [dangerous (format "\&#;`|*?~<>^()[]{}$"
(text.from-code (hex "0A"))
(text.from-code (hex "FF")))
dangerous (if windows?
(format dangerous "%!")
dangerous)
indices (list.n/range 0 (dec (text.size dangerous)))]
(function (_ unsafe)
(list/fold (function (_ index safer)
(let [bad (|> dangerous (text.nth index) maybe.assume text.from-code)
good (if windows?
" "
(format "\" bad))]
(text.replace-all bad good safer)))
unsafe
indices))))
(def: (sanitize-argument windows?)
(-> Bit (-> Text Text))
(if windows?
(|>> (text.replace-all "%" " ")
(text.replace-all "!" " ")
(text.replace-all text.double-quote " ")
(text.enclose' text.double-quote))
(|>> (text.replace-all "'" "\'")
(text.enclose' "'"))))
(`` (for {(~~ (static host.jvm))
(as-is (import: #long java/lang/String
(toLowerCase [] java/lang/String))
(def: (arguments-array arguments)
(-> (List Text) (Array java/lang/String))
(product.right
(list/fold (function (_ argument [idx output])
[(inc idx) (jvm.array-write idx argument output)])
[0 (jvm.array java/lang/String (list.size arguments))]
arguments)))
(import: #long (java/util/Map k v)
(put [k v] v))
(def: (load-environment input target)
(-> Context
(java/util/Map java/lang/String java/lang/String)
(java/util/Map java/lang/String java/lang/String))
(list/fold (function (_ [key value] target')
(exec (java/util/Map::put key value target')
target'))
target
(dictionary.entries input)))
(import: #long java/io/Reader
(read [] #io #try int))
(import: #long java/io/BufferedReader
(new [java/io/Reader])
(readLine [] #io #try java/lang/String))
(import: #long java/io/InputStream)
(import: #long java/io/InputStreamReader
(new [java/io/InputStream]))
(import: #long java/io/OutputStream
(write [(Array byte)] #io #try void))
(import: #long java/lang/Process
(getInputStream [] #io #try java/io/InputStream)
(getOutputStream [] #io #try java/io/OutputStream)
(destroy [] #io #try void))
(def: (process-console process)
(-> java/lang/Process (IO (Error (Console IO))))
(do (error.with-error io.monad)
[jvm-input (java/lang/Process::getInputStream process)
#let [jvm-input (|> jvm-input
java/io/InputStreamReader::new
java/io/BufferedReader::new)]
jvm-output (java/lang/Process::getOutputStream process)]
(wrap (: (Console IO)
(structure
(def: can-read
(console.can-read
(function (_ _)
(|> jvm-input
java/io/Reader::read
(:: (error.with-error io.monad) map .nat)))))
(def: can-read-line
(console.can-read
(function (_ _)
(|> jvm-input
java/io/BufferedReader::readLine))))
(def: can-write
(console.can-write
(function (_ message)
(|> jvm-output
(java/io/OutputStream::write (encoding.to-utf8 message))))))
(def: can-close
(console.can-close
(function (_ _)
(|> process
java/lang/Process::destroy)))))))))
(import: #long java/lang/ProcessBuilder
(new [(Array java/lang/String)])
(environment [] #io #try (java/util/Map java/lang/String java/lang/String))
(start [] #io #try java/lang/Process))
(import: #long java/lang/System
(#static getProperty [java/lang/String] #io #try java/lang/String))
)}))
(def: #export (execute environment command arguments)
(-> Context Text (List Text) (IO (Error (Console IO))))
(`` (for {(~~ (static host.jvm))
(do (error.with-error io.monad)
[windows? (:: @ map (|>> java/lang/String::toLowerCase ..windows?)
(java/lang/System::getProperty "os.name"))
#let [builder (java/lang/ProcessBuilder::new (arguments-array (list& (sanitize-command windows? command)
(list/map (sanitize-argument windows?) arguments))))]
environment (:: @ map (load-environment environment)
(java/lang/ProcessBuilder::environment builder))
process (java/lang/ProcessBuilder::start builder)]
(process-console process))})))
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