upload.go

   1 // GoCheese -- Python private package repository and caching proxy
   2 // Copyright (C) 2019-2024 Sergey Matveev <stargrave@stargrave.org>
   3 //               2019-2024 Elena Balakhonova <balakhonova_e@riseup.net>
   4 //
   5 // This program is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, version 3 of the License.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 package main
  18
  19 import (
  20         "bufio"
  21         "bytes"
  22         "crypto/sha256"
  23         "encoding/hex"
  24         "io"
  25         "log"
  26         "net/http"
  27         "os"
  28         "path/filepath"
  29         "regexp"
  30         "strings"
  31         "time"
  32
  33         "go.cypherpunks.ru/recfile"
  34 )
  35
  36 var NormalizationRe = regexp.MustCompilePOSIX("[-_.]+")
  37
  38 func serveUpload(w http.ResponseWriter, r *http.Request) {
  39         user := r.Context().Value(CtxUserKey).(*User)
  40         if user == nil {
  41                 log.Println(r.RemoteAddr, "unauthorised")
  42                 http.Error(w, "unauthorised", http.StatusUnauthorized)
  43                 return
  44         }
  45         if user.ro {
  46                 log.Println(r.RemoteAddr, "ro user", user.name)
  47                 http.Error(w, "unauthorised", http.StatusUnauthorized)
  48                 return
  49         }
  50
  51         // Form parsing
  52         var err error
  53         if err = r.ParseMultipartForm(1 << 20); err != nil {
  54                 http.Error(w, err.Error(), http.StatusBadRequest)
  55                 return
  56         }
  57         pkgNames, exists := r.MultipartForm.Value["name"]
  58         if !exists || len(pkgNames) != 1 {
  59                 http.Error(w, "single name is expected in request", http.StatusBadRequest)
  60                 return
  61         }
  62         pkgName := strings.ToLower(NormalizationRe.ReplaceAllString(pkgNames[0], "-"))
  63         dirPath := filepath.Join(Root, pkgName)
  64         now := time.Now().UTC()
  65
  66         var digestSHA256Expected []byte
  67         if digestSHA256ExpectedHex, exists := r.MultipartForm.Value["sha256_digest"]; exists {
  68                 digestSHA256Expected, err = hex.DecodeString(digestSHA256ExpectedHex[0])
  69                 if err != nil {
  70                         http.Error(w, "bad sha256_digest: "+err.Error(), http.StatusBadRequest)
  71                         return
  72                 }
  73         }
  74         var digestBLAKE2b256Expected []byte
  75         if digestBLAKE2b256ExpectedHex, exists := r.MultipartForm.Value["blake2_256_digest"]; exists {
  76                 digestBLAKE2b256Expected, err = hex.DecodeString(digestBLAKE2b256ExpectedHex[0])
  77                 if err != nil {
  78                         http.Error(w, "bad blake2_256_digest: "+err.Error(), http.StatusBadRequest)
  79                         return
  80                 }
  81         }
  82
  83         // Checking is it internal package
  84         if _, err = os.Stat(filepath.Join(dirPath, InternalFlag)); err != nil {
  85                 log.Println(r.RemoteAddr, "non-internal package", pkgName)
  86                 http.Error(w, "unknown internal package", http.StatusUnauthorized)
  87                 return
  88         }
  89
  90         for _, file := range r.MultipartForm.File["content"] {
  91                 filename := file.Filename
  92                 log.Println(r.RemoteAddr, "put", filename, "by", user.name)
  93                 path := filepath.Join(dirPath, filename)
  94                 if _, err = os.Stat(path); err == nil {
  95                         log.Println(r.RemoteAddr, filename, "already exists")
  96                         http.Error(w, "already exists", http.StatusBadRequest)
  97                         return
  98                 }
  99                 if !mkdirForPkg(w, r, pkgName) {
 100                         return
 101                 }
 102                 src, err := file.Open()
 103                 if err != nil {
 104                         log.Println("error", r.RemoteAddr, filename, err)
 105                         http.Error(w, err.Error(), http.StatusInternalServerError)
 106                         return
 107                 }
 108                 defer src.Close()
 109                 dst, err := TempFile(dirPath)
 110                 if err != nil {
 111                         log.Println("error", r.RemoteAddr, filename, err)
 112                         http.Error(w, err.Error(), http.StatusInternalServerError)
 113                         return
 114                 }
 115                 dstBuf := bufio.NewWriter(dst)
 116                 hasherSHA256 := sha256.New()
 117                 hasherBLAKE2b256 := blake2b256New()
 118                 wr := io.MultiWriter(hasherSHA256, hasherBLAKE2b256, dst)
 119                 if _, err = io.Copy(wr, src); err != nil {
 120                         log.Println("error", r.RemoteAddr, filename, err)
 121                         os.Remove(dst.Name())
 122                         dst.Close()
 123                         http.Error(w, err.Error(), http.StatusInternalServerError)
 124                         return
 125                 }
 126                 if err = dstBuf.Flush(); err != nil {
 127                         log.Println("error", r.RemoteAddr, filename, err)
 128                         os.Remove(dst.Name())
 129                         dst.Close()
 130                         http.Error(w, err.Error(), http.StatusInternalServerError)
 131                         return
 132                 }
 133                 if !NoSync {
 134                         if err = dst.Sync(); err != nil {
 135                                 log.Println("error", r.RemoteAddr, filename, err)
 136                                 os.Remove(dst.Name())
 137                                 dst.Close()
 138                                 http.Error(w, err.Error(), http.StatusInternalServerError)
 139                                 return
 140                         }
 141                 }
 142                 dst.Close()
 143
 144                 digestSHA256 := hasherSHA256.Sum(nil)
 145                 digestBLAKE2b256 := hasherBLAKE2b256.Sum(nil)
 146                 if digestSHA256Expected != nil {
 147                         if bytes.Equal(digestSHA256Expected, digestSHA256) {
 148                                 log.Println(r.RemoteAddr, filename, "good SHA256 checksum received")
 149                         } else {
 150                                 log.Println(r.RemoteAddr, filename, "bad SHA256 checksum received")
 151                                 http.Error(w, "bad sha256 checksum", http.StatusBadRequest)
 152                                 os.Remove(dst.Name())
 153                                 return
 154                         }
 155                 }
 156                 if digestBLAKE2b256Expected != nil {
 157                         if bytes.Equal(digestBLAKE2b256Expected, digestBLAKE2b256) {
 158                                 log.Println(r.RemoteAddr, filename, "good BLAKE2b-256 checksum received")
 159                         } else {
 160                                 log.Println(r.RemoteAddr, filename, "bad BLAKE2b-256 checksum received")
 161                                 http.Error(w, "bad blake2b_256 checksum", http.StatusBadRequest)
 162                                 os.Remove(dst.Name())
 163                                 return
 164                         }
 165                 }
 166
 167                 if err = os.Rename(dst.Name(), path); err != nil {
 168                         log.Println("error", r.RemoteAddr, path, err)
 169                         http.Error(w, err.Error(), http.StatusInternalServerError)
 170                         return
 171                 }
 172                 if err = DirSync(dirPath); err != nil {
 173                         log.Println("error", r.RemoteAddr, dirPath, err)
 174                         http.Error(w, err.Error(), http.StatusInternalServerError)
 175                         return
 176                 }
 177                 if err = WriteFileSync(dirPath, path+"."+HashAlgoSHA256, digestSHA256, now); err != nil {
 178                         log.Println("error", r.RemoteAddr, path+"."+HashAlgoSHA256, err)
 179                         http.Error(w, err.Error(), http.StatusInternalServerError)
 180                         return
 181                 }
 182                 if err = WriteFileSync(dirPath, path+"."+HashAlgoBLAKE2b256, digestBLAKE2b256, now); err != nil {
 183                         log.Println("error", r.RemoteAddr, path+"."+HashAlgoBLAKE2b256, err)
 184                         http.Error(w, err.Error(), http.StatusInternalServerError)
 185                         return
 186                 }
 187         }
 188
 189         var buf bytes.Buffer
 190         wr := recfile.NewWriter(&buf)
 191         for _, m := range MDFormToRecField {
 192                 formField, recField := m[0], m[1]
 193                 if vs, exists := r.MultipartForm.Value[formField]; exists {
 194                         for _, v := range vs {
 195                                 lines := strings.Split(v, "\n")
 196                                 if len(lines) > 1 {
 197                                         _, err = wr.WriteFieldMultiline(recField, lines)
 198                                 } else {
 199                                         _, err = wr.WriteFields(recfile.Field{
 200                                                 Name:  recField,
 201                                                 Value: lines[0],
 202                                         })
 203                                 }
 204                                 if err != nil {
 205                                         log.Fatal(err)
 206                                 }
 207                         }
 208                 }
 209         }
 210         path := filepath.Join(dirPath, MDFile)
 211         if err = WriteFileSync(dirPath, path, buf.Bytes(), now); err != nil {
 212                 log.Println("error", r.RemoteAddr, path, err)
 213                 http.Error(w, err.Error(), http.StatusInternalServerError)
 214                 return
 215         }
 216 }