wide/shell/shells.go

194 lines
4.6 KiB
Go

// Copyright (c) 2014, B3log
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package shell include shell related mainipulations.
package shell
import (
"html/template"
"math/rand"
"net/http"
"os"
"os/exec"
"runtime"
"strconv"
"strings"
"time"
"github.com/b3log/wide/conf"
"github.com/b3log/wide/i18n"
"github.com/b3log/wide/session"
"github.com/b3log/wide/util"
"github.com/golang/glog"
"github.com/gorilla/websocket"
)
// Shell channel.
//
// <sid, *util.WSChannel>>
var ShellWS = map[string]*util.WSChannel{}
// IndexHandler handles request of Shell index.
func IndexHandler(w http.ResponseWriter, r *http.Request) {
httpSession, _ := session.HTTPSession.Get(r, "wide-session")
if httpSession.IsNew {
http.Redirect(w, r, conf.Wide.Context+"login", http.StatusFound)
return
}
httpSession.Options.MaxAge = conf.Wide.HTTPSessionMaxAge
if "" != conf.Wide.Context {
httpSession.Options.Path = conf.Wide.Context
}
httpSession.Save(r, w)
// create a wide session
rand.Seed(time.Now().UnixNano())
sid := strconv.Itoa(rand.Int())
wideSession := session.WideSessions.New(httpSession, sid)
username := httpSession.Values["username"].(string)
locale := conf.Wide.GetUser(username).Locale
model := map[string]interface{}{"conf": conf.Wide, "i18n": i18n.GetAll(locale), "locale": locale,
"session": wideSession}
wideSessions := session.WideSessions.GetByUsername(username)
glog.V(3).Infof("User [%s] has [%d] sessions", username, len(wideSessions))
t, err := template.ParseFiles("views/shell.html")
if nil != err {
glog.Error(err)
http.Error(w, err.Error(), 500)
return
}
t.Execute(w, model)
}
// WSHandler handles request of creating Shell channel.
func WSHandler(w http.ResponseWriter, r *http.Request) {
httpSession, _ := session.HTTPSession.Get(r, "wide-session")
if httpSession.IsNew {
http.Error(w, "Forbidden", http.StatusForbidden)
return
}
username := httpSession.Values["username"].(string)
sid := r.URL.Query()["sid"][0]
conn, _ := websocket.Upgrade(w, r, nil, 1024, 1024)
wsChan := util.WSChannel{Sid: sid, Conn: conn, Request: r, Time: time.Now()}
ret := map[string]interface{}{"output": "Shell initialized", "cmd": "init-shell"}
err := wsChan.WriteJSON(&ret)
if nil != err {
return
}
ShellWS[sid] = &wsChan
glog.V(4).Infof("Open a new [Shell] with session [%s], %d", sid, len(ShellWS))
input := map[string]interface{}{}
for {
if err := wsChan.ReadJSON(&input); err != nil {
glog.Error("Shell WS ERROR: " + err.Error())
return
}
inputCmd := input["cmd"].(string)
cmds := strings.Split(inputCmd, "|")
commands := []*exec.Cmd{}
for _, cmdWithArgs := range cmds {
cmdWithArgs = strings.TrimSpace(cmdWithArgs)
cmdWithArgs := strings.Split(cmdWithArgs, " ")
args := []string{}
if len(cmdWithArgs) > 1 {
args = cmdWithArgs[1:]
}
cmd := exec.Command(cmdWithArgs[0], args...)
commands = append(commands, cmd)
}
output := ""
if !strings.Contains(inputCmd, "clear") {
output = pipeCommands(username, commands...)
}
ret = map[string]interface{}{"output": output, "cmd": "shell-output"}
if err := wsChan.WriteJSON(&ret); err != nil {
glog.Error("Shell WS ERROR: " + err.Error())
return
}
wsChan.Refresh()
}
}
func pipeCommands(username string, commands ...*exec.Cmd) string {
for i, command := range commands[:len(commands)-1] {
setCmdEnv(command, username)
stdout, err := command.StdoutPipe()
if nil != err {
return err.Error()
}
command.Start()
commands[i+1].Stdin = stdout
}
last := commands[len(commands)-1]
setCmdEnv(last, username)
out, err := last.CombinedOutput()
// release resources
for _, command := range commands[:len(commands)-1] {
command.Wait()
}
if err != nil {
return err.Error()
}
return string(out)
}
func setCmdEnv(cmd *exec.Cmd, username string) {
userWorkspace := conf.Wide.GetUserWorkspace(username)
cmd.Env = append(cmd.Env,
"TERM="+os.Getenv("TERM"),
"GOPATH="+userWorkspace,
"GOOS="+runtime.GOOS,
"GOARCH="+runtime.GOARCH,
"GOROOT="+runtime.GOROOT(),
"PATH="+os.Getenv("PATH"))
cmd.Dir = userWorkspace
}