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handler.go
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handler.go
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package main
import (
"crypto/rand"
_ "embed"
"encoding/base64"
"html/template"
"io"
"log"
"net/http"
"os"
"path"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"github.com/agnivade/wasmbrowsertest/filesys"
)
//go:embed index.html
var indexHTML string
type wasmServer struct {
indexTmpl *template.Template
wasmFile string
wasmExecJS []byte
args []string
envMap map[string]string
logger *log.Logger
fsHandler *filesys.Handler
securityToken string
}
func NewWASMServer(wasmFile string, args []string, coverageFile string, l *log.Logger) (http.Handler, error) {
var err error
srv := &wasmServer{
wasmFile: wasmFile,
args: args,
logger: l,
envMap: make(map[string]string),
}
// try for some security on an api capable of
// reads and writes to the file system
srv.securityToken, err = generateToken()
if err != nil {
return nil, err
}
srv.fsHandler = filesys.NewHandler(srv.securityToken, l)
for _, env := range os.Environ() {
vars := strings.SplitN(env, "=", 2)
srv.envMap[vars[0]] = vars[1]
}
buf, err := os.ReadFile(path.Join(runtime.GOROOT(), "misc/wasm/wasm_exec.js"))
if err != nil {
return nil, err
}
srv.wasmExecJS = buf
srv.indexTmpl, err = template.New("index").Parse(indexHTML)
if err != nil {
return nil, err
}
return srv, nil
}
func (ws *wasmServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// log.Println(r.URL.Path)
switch r.URL.Path {
case "/", "/index.html":
w.Header().Set("Content-Type", "text/html; charset=UTF-8")
data := struct {
WASMFile string
Args []string
EnvMap map[string]string
SecurityToken string
Pid int
Ppid int
}{
WASMFile: filepath.Base(ws.wasmFile),
Args: ws.args,
EnvMap: ws.envMap,
SecurityToken: ws.securityToken,
Pid: os.Getpid(),
Ppid: os.Getppid(),
}
err := ws.indexTmpl.Execute(w, data)
if err != nil {
ws.logger.Println(err)
}
case "/" + filepath.Base(ws.wasmFile):
f, err := os.Open(ws.wasmFile)
if err != nil {
ws.logger.Println(err)
return
}
defer func() {
err := f.Close()
if err != nil {
ws.logger.Println(err)
}
}()
http.ServeContent(w, r, r.URL.Path, time.Now(), f)
case "/wasm_exec.js":
w.Header().Set("Content-Type", "application/javascript")
w.Header().Set("Content-Length", strconv.Itoa(len(ws.wasmExecJS)))
if _, err := w.Write(ws.wasmExecJS); err != nil {
ws.logger.Println("unable to write wasm_exec.")
}
default:
if strings.HasPrefix(r.URL.Path, "/fs/") {
ws.fsHandler.ServeHTTP(w, r)
}
}
}
func generateToken() (string, error) {
buf := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, buf); err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(buf), nil
}