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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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"debug": "2.6.9",
"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",
"range-parser": "~1.2.1",
"statuses": "~1.5.0"
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"encodeurl": "~1.0.2",
"escape-html": "~1.0.3",
"parseurl": "~1.3.3",
"send": "0.17.1"
}
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"integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
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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
go run main.go $*
node src

102
lxc/execute
View File

@ -4,11 +4,7 @@ dir="$( cd "$( dirname "$0" )" && pwd )"
touch $dir/lockfile
if [ -z "$1" ]; then
echo "invalid args"
exit
fi
if [ -z "$2" ]; then
if [ -z "$1" ] || [ -z "$2" ]; then
echo "invalid args"
exit
fi
@ -40,104 +36,10 @@ else
fi
exec 200>&-
bin=
case "$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
timeout -s KILL 20 \
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
lxc-attach --clear-env -n piston -- \

8
lxc/versions
View File

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

2
readme.md
View File

@ -167,7 +167,7 @@ Content-Type: application/json
- typescript
#### 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
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.).