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server.go
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server.go
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/*
Copyright 2020 - Jose Gonzalez Krause
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 main
import (
"fmt"
"log"
"net/http"
"strings"
"time"
"github.com/fatih/color"
"github.com/gin-gonic/gin"
)
// Server is the main server object
type Server struct {
port string
host string
path string
safe bool
noUpload bool
noCmd bool
tls bool
}
// NewServer returns a new configured Server instance
func NewServer(host, port, path string, tls, safe, noUpload, noCmd bool) *Server {
return &Server{
host: host,
port: port,
path: path,
safe: safe,
tls: tls,
noCmd: noCmd,
noUpload: noUpload,
}
}
// Run starts the server
func (s *Server) Run() error {
errPrinter := color.New(color.FgHiRed)
italics := color.New(color.Italic).SprintFunc()
gin.SetMode(gin.ReleaseMode)
r := gin.New()
if !s.safe {
r.MaxMultipartMemory = 8 << 20 // 8MB
} else {
errPrinter.Println("- 8MB file upload limit DISABLED!")
}
r.Use(s.LoggerMW())
r.Use(s.CustomizerMW())
r.StaticFS("/nav", gin.Dir(s.path, true))
r.GET("/", s.IndexGet)
if !s.noUpload {
r.GET("/upl", s.UploadGet)
r.POST("/upl", s.UploadPost)
}
if !s.noCmd {
r.GET("/cmd", s.CmdGet)
r.POST("/cmd", s.CmdPost)
}
log.Println("- Log: ", italics("date - src:port - code - path"))
if s.tls {
if err := r.RunTLS(s.host+":"+s.port, "./cert.pem", "key.pem"); err != nil {
return err
}
} else {
if err := r.Run(s.host + ":" + s.port); err != nil {
return err
}
}
return nil
}
// ============
// = Handlers =
// ============
// IndexGet returns the index page
func (s *Server) IndexGet(c *gin.Context) {
c.Header("Content-Type", "text/html; charset=UTF-8")
c.String(http.StatusOK, indexTemplate)
}
// UploadGet returns the upload page
func (s *Server) UploadGet(c *gin.Context) {
c.Header("Content-Type", "text/html; charset=UTF-8")
c.String(http.StatusOK, uploadTemplate)
}
// UploadPost handles the upload form
func (s *Server) UploadPost(c *gin.Context) {
file, err := c.FormFile("uploadfile")
if err != nil {
c.String(http.StatusInternalServerError, fmt.Sprintf("Error: '%s'", err.Error()))
return
}
log.Printf("- Uploaded file: '%s'", file.Filename)
// FIXME: Sanitize path
c.SaveUploadedFile(file, s.path+"/"+file.Filename)
c.Header("Content-Type", "text/html; charset=UTF-8")
c.String(http.StatusOK, fmt.Sprintf(uploadedTemplate, file.Filename, path))
}
// CmdGet returns the cmd page
func (s *Server) CmdGet(c *gin.Context) {
c.Header("Content-Type", "text/html; charset=UTF-8")
c.String(http.StatusOK, cmdTemplate)
}
// CmdPost submits the command to execute and returns the result
func (s *Server) CmdPost(c *gin.Context) {
var err error
var out []byte
cmd := c.PostForm("cmd")
cmdTemplate := strings.Replace(cmdTemplate, "__CMD__", cmd, -1)
if cmd == "" {
out = []byte("Invalid command")
} else {
log.Printf("- cmd: %s", cmd)
var os OS
out, err = os.Exec(cmd)
if err != nil {
out = []byte(err.Error())
}
}
cmdTemplate = strings.Replace(cmdTemplate, "__CODE__", string(out), -1)
c.Header("Content-Type", "text/html; charset=UTF-8")
c.String(http.StatusOK, cmdTemplate)
}
// =============
// Middlewares =
// =============
// LoggerMW is a custom logging middleware
func (s *Server) LoggerMW() gin.HandlerFunc {
return func(c *gin.Context) {
now := time.Now()
path := c.Request.URL.Path
src := c.Request.RemoteAddr
if strings.Contains(path, "favicon") {
return
}
// before request ^^^
// c.Next()
// after request vvv
status := c.Writer.Status()
log.Printf("> %s - %s - %d - %s",
now.Format(time.RFC1123Z),
src,
status,
path,
)
}
}
// CustomizerMW sets some custom data on each request
func (s *Server) CustomizerMW() gin.HandlerFunc {
return func(c *gin.Context) {
c.Header("Cache-Control", "no-cache")
c.Header("Server", "Zeppelin v"+version)
}
}