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Merge pull request #45 from Vrganj/master 

API rewrite in node
This commit is contained in:
Brian Seymour 2021-01-15 18:12:32 -06:00 committed by GitHub
parent b2b69db27d d666e5c19d
commit c1872295c2
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GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 1194 additions and 406 deletions
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1
api/.gitignore vendored Normal file
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node_modules

302
api/main.go
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@ -1,302 +0,0 @@
package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os/exec"
"regexp"
"strings"
"time"
)
type Inbound struct {
Language string `json:"language"`
Source string `json:"source"`
Args []string `json:"args"`
}
type Problem struct {
Code string `json:"code"`
Message string `json:"message"`
}
type Outbound struct {
Ran bool `json:"ran"`
Language string `json:"language"`
Version string `json:"version"`
Output string `json:"output"`
Stdout string `json:"stdout"`
Stderr string `json:"stderr"`
}
type Language struct {
Name string `json:"name,omitempty"`
Version string `json:"version,omitempty"`
}
var instance int
var languages []Language
func main() {
port := "2000"
var err error
languages, err = UpdateVersions()
if err != nil {
fmt.Println("could not get version info and therefore couldn't start")
fmt.Println(err)
return
}
fmt.Println("starting api on port", port)
http.HandleFunc("/execute", Execute)
http.HandleFunc("/versions", Versions)
http.ListenAndServe(":"+port, nil)
}
func Execute(res http.ResponseWriter, req *http.Request) {
res.Header().Set("Content-Type", "application/json")
// get json
inbound := Inbound{}
message := json.NewDecoder(req.Body)
message.Decode(&inbound)
whitelist := []string{
"awk",
"bash",
"brainfuck", "bf",
"c",
"cpp", "c++",
"csharp", "cs", "c#",
"deno", "denojs", "denots",
"elixir", "exs",
"emacs", "elisp", "el",
"go",
"haskell", "hs",
"java",
"jelly",
"julia", "jl",
"kotlin",
"lua",
"nasm", "asm",
"nasm64", "asm64",
"node", "javascript", "js",
"perl", "pl",
"php",
"python2",
"python3", "python",
"paradoc",
"ruby",
"rust",
"swift",
"typescript", "ts",
}
// check if the supplied language is supported
// now calls function and returns
for _, lang := range whitelist {
if lang == inbound.Language {
launch(inbound, res)
return
}
}
// now only called when the language is not supported
problem := Problem{
Code: "unsupported_language",
Message: inbound.Language + " is not supported by Piston",
}
pres, _ := json.Marshal(problem)
res.WriteHeader(http.StatusBadRequest)
res.Write(pres)
}
func Versions(res http.ResponseWriter, req *http.Request) {
res.Header().Set("Content-Type", "application/json")
data, _ := json.Marshal(languages)
res.Write(data)
}
type StdWriter struct {
combined *string
separate *string
}
func (writer *StdWriter) Write(data []byte) (int, error) {
*writer.combined += string(data)
*writer.separate += string(data)
return len(data), nil
}
func launch(request Inbound, res http.ResponseWriter) {
stamp := time.Now().UnixNano()
// write the code to temp dir
srcfile := fmt.Sprintf("/tmp/%d.code", stamp)
ioutil.WriteFile(srcfile, []byte(request.Source), 0644)
// set up the arguments to send to the execute command
cmd := exec.Command("../lxc/execute", request.Language, srcfile, strings.Join(request.Args, "\n"))
// capture out/err
var stdout, stderr, combined string
cmd.Stdout = &StdWriter{
combined: &combined,
separate: &stdout,
}
cmd.Stderr = &StdWriter{
combined: &combined,
separate: &stderr,
}
err := cmd.Run()
stdout = strings.TrimSpace(stdout)
stderr = strings.TrimSpace(stderr)
combined = strings.TrimSpace(combined)
if len(stdout) > 65536 {
stdout = stdout[:65536]
}
if len(stderr) > 65536 {
stderr = stdout[:65536]
}
if len(combined) > 65536 {
combined = combined[:65536]
}
// get the executing version of the language
execlang := request.Language
switch execlang {
case "bf":
execlang = "brainfuck"
case "c++":
execlang = "cpp"
case "cs", "c#":
execlang = "csharp"
case "denojs", "denots":
execlang = "deno"
case "el", "elisp":
execlang = "emacs"
case "exs":
execlang = "elixir"
case "hs":
execlang = "haskell"
case "asm":
execlang = "nasm"
case "asm64":
execlang = "nasm64"
case "js", "javascript":
execlang = "node"
case "jl":
execlang = "julia"
case "python":
execlang = "python3"
case "ts":
execlang = "typescript"
}
// prepare response
outbound := Outbound{
Ran: err == nil,
Language: request.Language,
Version: "",
Output: combined,
Stdout: stdout,
Stderr: stderr,
}
// retrieve the language version
for _, lang := range languages {
if lang.Name == execlang {
outbound.Version = lang.Version
break
}
}
response, _ := json.Marshal(outbound)
res.Write(response)
}
func UpdateVersions() ([]Language, error) {
langs, err := GetVersions()
if err != nil {
return nil, err
}
return langs, nil
}
// get all the language and their current version
func GetVersions() ([]Language, error) {
var languages []Language
res, err := ExecVersionScript()
if err != nil {
return nil, err
}
info := strings.Split(res, "---")
for _, v := range info {
if len(v) < 2 {
continue
}
name, version := GetVersion(v)
languages = append(languages, Language{
Name: name,
Version: version,
})
}
return languages, nil
}
// run the script that retrieves all the language versions
func ExecVersionScript() (string, error) {
cmd := exec.Command("../lxc/versions")
var stdout bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stdout
err := cmd.Run()
return strings.ToLower(stdout.String()), err
}
// return the language and its version
// most of the time it is easy to get the name and version
// but for some languages helper functions are used
func GetVersion(s string) (string, string) {
lines := strings.Split(s, "\n")
if lines[1] == "java" {
return "java", regexp.MustCompile("([0-9]+)").FindString(lines[2])
}
if lines[1] == "emacs" {
return "emacs", regexp.MustCompile("([0-9]+\\.[0-9]+)").FindString(lines[2])
}
return lines[1], regexp.MustCompile("([0-9]+\\.[0-9]+\\.[0-9]+)").FindString(s)
}

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api/package-lock.json generated Normal file
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"depd": "~1.1.2",
"destroy": "~1.0.4",
"encodeurl": "~1.0.2",
"escape-html": "~1.0.3",
"etag": "~1.8.1",
"fresh": "0.5.2",
"http-errors": "~1.7.2",
"mime": "1.6.0",
"ms": "2.1.1",
"on-finished": "~2.3.0",
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"encodeurl": "~1.0.2",
"escape-html": "~1.0.3",
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16
api/package.json Normal file
View File

@ -0,0 +1,16 @@
{
"name": "api",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.17.1",
"express-validator": "^6.9.2"
}
}

48
api/src/execute.js Normal file
View File

@ -0,0 +1,48 @@
const { writeFile } = require('fs/promises');
const { spawn } = require('child_process');
async function execute(res, language, body) {
const stamp = new Date().getTime();
const sourceFile = `/tmp/${stamp}.code`;
await writeFile(sourceFile, body.source);
const process = spawn(__dirname + '/../../lxc/execute', [
language.name,
sourceFile,
body.args?.join('\n') ?? '',
]);
const result = {
ran: true,
language: language.name,
stderr: '',
stdout: '',
output: '',
};
if (language.version)
result.version = language.version;
process.stderr.on('data', chunk => {
result.stderr += chunk;
result.output += chunk;
});
process.stdout.on('data', chunk => {
result.stdout += chunk;
result.output += chunk;
});
process.on('exit', () => {
result.stderr = result.stderr.trim().substring(0, 65535);
result.stdout = result.stdout.trim().substring(0, 65535);
result.output = result.output.trim().substring(0, 65535);
res.json(result);
});
}
module.exports = {
execute,
};

63
api/src/index.js Normal file
View File

@ -0,0 +1,63 @@
const express = require('express');
const { execute } = require('./execute');
const { languages } = require('./languages');
const { checkSchema, validationResult } = require('express-validator');
const PORT = 2000;
const app = express();
app.use(express.json());
app.post(
'/execute',
checkSchema({
language: {
in: 'body',
notEmpty: {
errorMessage: 'Supply a language field',
},
isString: {
errorMessage: 'Supplied language is not a string',
},
custom: {
options: value => languages.find(language => language.aliases.includes(value?.toLowerCase())),
errorMessage: 'Supplied language is not supported by Piston',
},
},
source: {
in: 'body',
notEmpty: {
errorMessage: 'Supply a source field',
},
isString: {
errorMessage: 'Supplied source is not a string',
},
},
args: {
in: 'body',
optional: true,
isArray: {
errorMessage: 'Supplied args is not an array',
},
}
}),
(req, res) => {
const errors = validationResult(req).array();
if (errors.length === 0) {
const language = languages.find(language =>
language.aliases.includes(req.body.language.toLowerCase())
);
execute(res, language, req.body);
} else {
res.status(400).json({
message: errors[0].msg,
});
}
},
);
app.get('/versions', (_, res) => res.json(languages));
app.listen(PORT, () => console.log(`Listening on port ${PORT}`));

153
api/src/languages.js Normal file
View File

@ -0,0 +1,153 @@
const { spawn } = require('child_process');
const languages = [
{
name: 'nasm',
aliases: ['asm', 'nasm'],
},
{
name: 'nasm64',
aliases: ['asm64', 'nasm64'],
},
{
name: 'awk',
aliases: ['awk'],
},
{
name: 'bash',
aliases: ['bash'],
},
{
name: 'brainfuck',
aliases: ['bf', 'brainfuck'],
},
{
name: 'c',
aliases: ['c'],
},
{
name: 'csharp',
aliases: ['c#', 'cs', 'csharp'],
},
{
name: 'cpp',
aliases: ['c++', 'cpp'],
},
{
name: 'deno',
aliases: ['deno', 'denojs', 'denots'],
},
{
name: 'ruby',
aliases: ['duby', 'rb', 'ruby'],
},
{
name: 'emacs',
aliases: ['el', 'elisp', 'emacs'],
},
{
name: 'elixir',
aliases: ['elixir'],
},
{
name: 'haskell',
aliases: ['haskell', 'hs'],
},
{
name: 'go',
aliases: ['go'],
},
{
name: 'java',
aliases: ['java'],
},
{
name: 'node',
aliases: ['javascript', 'js', 'node'],
},
{
name: 'jelly',
aliases: ['jelly'],
},
{
name: 'julia',
aliases: ['jl', 'julia'],
},
{
name: 'kotlin',
aliases: ['kotlin'],
},
{
name: 'lua',
aliases: ['lua'],
},
{
name: 'paradoc',
aliases: ['paradoc'],
},
{
name: 'perl',
aliases: ['perl'],
},
{
name: 'php',
aliases: ['php', 'php3', 'php4', 'php5'],
},
{
name: 'python3',
aliases: ['py', 'py3', 'python', 'python3'],
},
{
name: 'python2',
aliases: ['python2'],
},
{
name: 'rust',
aliases: ['rs', 'rust'],
},
{
name: 'swift',
aliases: ['swift'],
},
{
name: 'typescript',
aliases: ['ts', 'typescript'],
},
];
{
const process = spawn(__dirname + '/../../lxc/versions');
let output = '';
process.stderr.on('data', chunk => output += chunk);
process.stdout.on('data', chunk => output += chunk);
process.on('exit', () => {
const sections = output.toLowerCase().split('---');
const versions = {};
for (const section of sections) {
const lines = section.trim().split('\n');
if (lines.length >= 2) {
const language = lines[0];
if (language === 'java') {
versions[language] = /\d+/.exec(lines[1])?.[0];
} else if (language === 'emacs') {
versions[language] = /\d+\.\d+/.exec(lines[1])?.[0];
} else {
versions[language] = /\d+\.\d+\.\d+/.exec(section)?.[0];
}
}
}
for (const language of languages) {
language.version = versions[language.name];
}
});
}
module.exports = {
languages,
};

2
api/start
View File

@ -1,3 +1,3 @@
#!/usr/bin/env bash #!/usr/bin/env bash
go run main.go $* node src

102
lxc/execute
View File

@ -4,11 +4,7 @@ dir="$( cd "$( dirname "$0" )" && pwd )"
touch $dir/lockfile touch $dir/lockfile
if [ -z "$1" ]; then if [ -z "$1" ] || [ -z "$2" ]; then
echo "invalid args"
exit
fi
if [ -z "$2" ]; then
echo "invalid args" echo "invalid args"
exit exit
fi fi
@ -40,104 +36,10 @@ else
fi fi
exec 200>&- exec 200>&-
bin=
case "$lang" in
"awk")
bin=awk
;;
"bash")
bin=bash
;;
"brainfuck" | "bf")
bin=brainfuck
;;
"c")
bin=c
;;
"cpp" | "c++")
bin=cpp
;;
"csharp" | "cs" | "c#")
bin=csharp
;;
"elixir" | "exs")
bin=elixir
;;
"go")
bin=go
;;
"haskell" | "hs")
bin=haskell
;;
"java")
bin=java
;;
"jelly")
bin=jelly
;;
"julia" | "jl")
bin=julia
;;
"kotlin")
bin=kotlin
;;
"lua")
bin=lua
;;
"nasm" | "asm")
bin=nasm
;;
"nasm64" | "asm64")
bin=nasm64
;;
"node" | "js" | "javascript")
bin=node
;;
"deno" | "denojs" | "denots")
bin=deno
;;
"paradoc")
bin=paradoc
;;
"perl")
bin=perl
;;
"php")
bin=php
;;
"python2")
bin=python2
;;
"python3" | "python")
bin=python3
;;
"ruby")
bin=ruby
;;
"rust")
bin=rust
;;
"swift")
bin=swift
;;
"emacs" | "elisp" | "el")
bin=emacs
;;
"bash")
bin=bash
;;
"typescript" | "ts")
bin=typescript
;;
*)
echo "invalid language"
exit
esac
# runner # runner
timeout -s KILL 20 \ timeout -s KILL 20 \
lxc-attach --clear-env -n piston -- \ lxc-attach --clear-env -n piston -- \
/bin/bash -l -c "bash /exec/$bin $newinc $epoch" /bin/bash -l -c "bash /exec/$lang $newinc $epoch"
# process janitor # process janitor
lxc-attach --clear-env -n piston -- \ lxc-attach --clear-env -n piston -- \

8
lxc/versions
View File

@ -14,11 +14,11 @@ echo '1.0.0'
echo '---' echo '---'
echo 'c' echo 'c'
lxc-attach --clear-env -n piston -- /bin/bash -l -c "gcc -v" lxc-attach --clear-env -n piston -- /bin/bash -l -c "gcc --version"
echo '---' echo '---'
echo 'cpp' echo 'cpp'
lxc-attach --clear-env -n piston -- /bin/bash -l -c "g++ -v" lxc-attach --clear-env -n piston -- /bin/bash -l -c "g++ --version"
echo '---' echo '---'
echo 'csharp' echo 'csharp'
@ -69,6 +69,10 @@ echo 'nasm'
lxc-attach --clear-env -n piston -- /bin/bash -l -c "nasm -version" lxc-attach --clear-env -n piston -- /bin/bash -l -c "nasm -version"
echo '---' echo '---'
echo 'nasm64'
lxc-attach --clear-env -n piston -- /bin/bash -l -c "nasm -version"
echo '---'
echo 'node' echo 'node'
lxc-attach --clear-env -n piston -- /bin/bash -l -c "node --version" lxc-attach --clear-env -n piston -- /bin/bash -l -c "node --version"
echo '---' echo '---'

2
readme.md
View File

@ -167,7 +167,7 @@ Content-Type: application/json
- typescript - typescript
#### Principle of Operation #### Principle of Operation
Piston utilizes LXC as the primary mechanism for sandboxing. There is a small API written in Go which takes Piston utilizes LXC as the primary mechanism for sandboxing. There is a small API written in Node which takes
in execution requests and executes them in the container. High level, the API writes in execution requests and executes them in the container. High level, the API writes
a temporary source and args file to `/tmp` and that gets mounted read-only along with the execution scripts into the container. a temporary source and args file to `/tmp` and that gets mounted read-only along with the execution scripts into the container.
The source file is either ran or compiled and ran (in the case of languages like c, c++, c#, go, etc.). The source file is either ran or compiled and ran (in the case of languages like c, c++, c#, go, etc.).