124 lines
2.6 KiB
Go
124 lines
2.6 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"os/exec"
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"strings"
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"time"
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)
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type inbound struct {
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Language string `json:"language"`
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Source string `json:"source"`
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Args []string `json:"args"`
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}
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type problem struct {
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Code string `json:"code"`
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Message string `json:"message"`
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}
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type outbound struct {
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Ran bool `json:"ran"`
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Output string `json:"output"`
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}
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var instance int
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func main() {
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port := 2000
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fmt.Println("starting api on port", port)
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http.HandleFunc("/execute", Execute)
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http.ListenAndServe(fmt.Sprintf("0.0.0.0:%d", port), nil)
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}
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func Execute(res http.ResponseWriter, req *http.Request) {
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res.Header().Set("Content-Type", "application/json")
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// get json
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inbound := inbound{}
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message := json.NewDecoder(req.Body)
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message.Decode(&inbound)
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whitelist := []string{
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"c",
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"cpp", "c++",
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"c#", "csharp", "cs",
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"go",
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"java",
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"nasm", "asm",
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"javascript", "js", "node",
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"typescript", "ts",
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"php",
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"python", "python2", "python3",
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"r",
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"ruby",
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"swift",
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"brainfuck", "bf",
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"rust",
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"bash",
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}
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// check if the supplied language is supported
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// now calls function and returns
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for _, lang := range whitelist {
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if lang == inbound.Language {
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launch(inbound, res)
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return
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}
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}
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// now only called when the language is not supported
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problem := problem{
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Code: "unsupported_language",
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Message: inbound.Language + " is not supported by Piston",
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}
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pres, _ := json.Marshal(problem)
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res.Write(pres)
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}
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func launch(request inbound, res http.ResponseWriter) {
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stamp := time.Now().UnixNano()
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// write the code to temp dir
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srcfile := fmt.Sprintf("/tmp/%d.code", stamp)
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ioutil.WriteFile(srcfile, []byte(request.Source), 0644)
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// set up the arguments to send to the execute command
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var args []string
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args = append(args, request.Language)
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args = append(args, srcfile)
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args = append(args, strings.Join(request.Args, "\n"))
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// set up the execution
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cmd := exec.Command("../lxc/execute", args...)
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// capture out/err
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var stdout, stderr bytes.Buffer
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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err := cmd.Run()
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// prepare response
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outbound := outbound{
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Ran: err == nil,
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Output: strings.TrimSpace(stdout.String()),
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}
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response, _ := json.Marshal(outbound)
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res.Write(response)
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}
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