136 lines
3.0 KiB
Go
136 lines
3.0 KiB
Go
package filemanager
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import (
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"bytes"
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"net/http"
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"os/exec"
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"path/filepath"
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"strings"
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"time"
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"github.com/gorilla/websocket"
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)
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var upgrader = websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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}
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var (
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cmdNotImplemented = []byte("Command not implemented.")
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cmdNotAllowed = []byte("Command not allowed.")
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)
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// command handles the requests for VCS related commands: git, svn and mercurial
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func command(w http.ResponseWriter, r *http.Request, c *FileManager, u *User) (int, error) {
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// Upgrades the connection to a websocket and checks for errors.
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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return 0, err
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}
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defer conn.Close()
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var (
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message []byte
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command []string
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)
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// Starts an infinite loop until a valid command is captured.
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for {
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_, message, err = conn.ReadMessage()
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if err != nil {
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return http.StatusInternalServerError, err
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}
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command = strings.Split(string(message), " ")
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if len(command) != 0 {
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break
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}
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}
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// Check if the command is allowed
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allowed := false
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for _, cmd := range u.Commands {
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if cmd == command[0] {
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allowed = true
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}
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}
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if !allowed {
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err = conn.WriteMessage(websocket.BinaryMessage, cmdNotAllowed)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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return 0, nil
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}
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// Check if the program is talled is installed on the computer.
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if _, err = exec.LookPath(command[0]); err != nil {
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err = conn.WriteMessage(websocket.BinaryMessage, cmdNotImplemented)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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return http.StatusNotImplemented, nil
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}
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// Gets the path and initializes a buffer.
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path := strings.Replace(r.URL.Path, c.baseURL, c.scope, 1)
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path = filepath.Clean(path)
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buff := new(bytes.Buffer)
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// Sets up the command executation.
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cmd := exec.Command(command[0], command[1:]...)
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cmd.Dir = path
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cmd.Stderr = buff
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cmd.Stdout = buff
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// Starts the command and checks for errors.
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err = cmd.Start()
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if err != nil {
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return http.StatusInternalServerError, err
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}
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// Set a 'done' variable to check whetever the command has already finished
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// running or not. This verification is done using a goroutine that uses the
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// method .Wait() from the command.
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done := false
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go func() {
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err = cmd.Wait()
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done = true
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}()
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// Function to print the current information on the buffer to the connection.
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print := func() error {
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by := buff.Bytes()
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if len(by) > 0 {
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err = conn.WriteMessage(websocket.TextMessage, by)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// While the command hasn't finished running, continue sending the output
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// to the client in intervals of 100 milliseconds.
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for !done {
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if err = print(); err != nil {
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return http.StatusInternalServerError, err
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}
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time.Sleep(100 * time.Millisecond)
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}
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// After the command is done executing, send the output one more time to the
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// browser to make sure it gets the latest information.
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if err = print(); err != nil {
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return http.StatusInternalServerError, err
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}
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return 0, nil
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}
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