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dwelling-upload/internal/http/handlers.go

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package http
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import (
"crypto/sha256"
"dwelling-upload/internal/configuration"
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"dwelling-upload/pkg/logging"
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"dwelling-upload/pkg/utils"
"dwelling-upload/web"
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"encoding/base64"
"encoding/hex"
"fmt"
"io"
"net/http"
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"net/url"
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"os"
"path"
"strings"
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"time"
)
type UploadHandlers struct {
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conf *configuration.Configuration
logErr *logging.Logger
logUpload *logging.Logger
logDownload *logging.Logger
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logDelete *logging.Logger
uploadDirSize *int64
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}
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func NewUploadHandlers(conf *configuration.Configuration, lErr, lUp, lDown, lDel *logging.Logger, uploadDirSize *int64) *UploadHandlers {
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return &UploadHandlers{
conf: conf,
logErr: lErr,
logUpload: lUp,
logDownload: lDown,
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logDelete: lDel,
uploadDirSize: uploadDirSize}
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}
func (*UploadHandlers) AssetsFS() http.FileSystem {
return web.Assets()
}
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func (h *UploadHandlers) Index(w http.ResponseWriter, r *http.Request) {
var storCapacity int64 = h.conf.Uploads.Limits.Storage << 20
var fMaxSize int64 = h.conf.Uploads.Limits.FileSize << 20
_, _, capStr := utils.ConvertFileSize(storCapacity)
_, _, usedStr := utils.ConvertFileSize(*h.uploadDirSize)
_, _, availStr := utils.ConvertFileSize(storCapacity - *h.uploadDirSize)
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_, _, fMaxSzStr := utils.ConvertFileSize(fMaxSize)
web.Index(utils.MainSite(r.Host), storCapacity, *h.uploadDirSize, h.conf.Uploads.Limits.KeepForHours, fMaxSzStr, usedStr, capStr, availStr, w)
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}
func (h *UploadHandlers) Upload(w http.ResponseWriter, r *http.Request) {
var fMaxSizeBytes int64 = h.conf.Uploads.Limits.FileSize << 20
var storCapacity int64 = h.conf.Uploads.Limits.Storage << 20
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r.Body = http.MaxBytesReader(w, r.Body, fMaxSizeBytes)
if err := r.ParseMultipartForm(fMaxSizeBytes); err != nil {
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h.logErr.Println("failed to parse form:", err)
http.Error(w, err.Error(), http.StatusExpectationFailed)
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return
}
f, fHandler, err := r.FormFile("file")
if err != nil {
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h.logErr.Println("failed to open incoming file:", err)
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w.WriteHeader(http.StatusInternalServerError)
http.Error(w, "cannot read incoming file", http.StatusInternalServerError)
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return
}
defer func() {
os.Remove(fHandler.Filename)
f.Close()
}()
var leftSpace int64 = storCapacity - *h.uploadDirSize
if leftSpace < fHandler.Size {
h.logErr.Println("not enough space left in storage, only", leftSpace>>20, "MiB left")
w.WriteHeader(http.StatusInternalServerError)
web.ErrorNoSpace(utils.MainSite(r.Host), w)
}
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s256 := sha256.New()
if _, err := io.Copy(s256, f); err != nil {
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h.logErr.Println("failed to compute SHA-256 hash:", err)
http.Error(w, "cannot compute hash for a file", http.StatusInternalServerError)
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return
}
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fHash := hex.EncodeToString(s256.Sum(nil))
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s256.Write([]byte(h.conf.HashSalt))
fSaltedHash := base64.RawURLEncoding.EncodeToString(s256.Sum(nil))
f.Seek(0, io.SeekStart)
fPath := path.Join(h.conf.Uploads.Directory, fSaltedHash)
_, err = os.Stat(fPath)
if os.IsNotExist(err) {
fDst, err := os.Create(fPath)
if err != nil {
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h.logErr.Println("failed to open file for writing", err)
http.Error(w, "cannot create your file", http.StatusInternalServerError)
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return
}
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defer fDst.Close()
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// We initialy set a dst file size to occupy space equal to uploaded's size.
// This is called a sparse file, if you need to know.
// It allows us to have a relatively small buffer size for inotify watcher.
// And it really affects that. I tested it.
fDst.Seek(fHandler.Size-1, io.SeekStart)
fDst.Write([]byte{0})
fDst.Seek(0, io.SeekStart)
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_, err = io.Copy(fDst, f)
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if err != nil {
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h.logErr.Println("failed to copy uploaded file to destination:", err)
http.Error(w, "cannot copy file's content", http.StatusInternalServerError)
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return
}
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typ, _ := utils.NetworkType(r.Host)
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h.logUpload.Printf("| %s | %s | %s | SHA256 %s | %s | %d | %s", r.Header.Get("X-Real-IP"), typ,
fHandler.Filename, fHash, fSaltedHash, fHandler.Size, r.UserAgent())
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w.WriteHeader(http.StatusCreated)
} else {
os.Chtimes(fPath, time.Now(), time.Now())
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w.WriteHeader(http.StatusFound)
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}
downloadURL := path.Join("/f", fSaltedHash, fHandler.Filename)
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downloadURLParsed, _ := url.Parse(downloadURL)
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_, scheme := utils.NetworkType(r.Host)
site := scheme + "://" + r.Host
if strings.Contains(r.UserAgent(), "curl") {
w.Write([]byte(site + downloadURLParsed.String() + "\r\n"))
return
}
web.Uploaded(utils.MainSite(r.Host), site, downloadURLParsed.String(), h.conf.Uploads.Limits.KeepForHours, w)
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}
func (h *UploadHandlers) Download(w http.ResponseWriter, r *http.Request) {
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saltedHash := GetURLParam(r, "hash")
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path := path.Join(h.conf.Uploads.Directory, saltedHash)
stat, err := os.Stat(path)
if os.IsNotExist(err) {
NotFound(w, r)
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return
}
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name := GetURLParam(r, "name")
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w.Header().Add("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", name))
fd, err := os.Open(path)
if err != nil {
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h.logErr.Println("failed to open file to read:", err)
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w.WriteHeader(http.StatusInternalServerError)
return
}
defer fd.Close()
netTyp, _ := utils.NetworkType(r.Host)
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h.logDownload.Printf("| %s | %s | %s | %s | %s", r.Header.Get("X-Real-IP"), netTyp, name, saltedHash, r.UserAgent())
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http.ServeContent(w, r, path, stat.ModTime(), fd)
}
func (h *UploadHandlers) Delete(w http.ResponseWriter, r *http.Request) {
var saltedHash string
if r.Method == "DELETE" {
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saltedHash = GetURLParam(r, "hash")
} else {
r.ParseForm()
saltedHash = r.FormValue("hash")
}
path := path.Join(h.conf.Uploads.Directory, saltedHash)
_, err := os.Stat(path)
if os.IsNotExist(err) {
NotFound(w, r)
return
}
err = os.Remove(path)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, err)
return
}
netTyp, _ := utils.NetworkType(r.Host)
h.logDelete.Printf("| %s | %s | %s | %s", r.Header.Get("X-Real-IP"), netTyp, saltedHash, r.UserAgent())
w.WriteHeader(http.StatusNoContent)
}
func NotFound(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNotFound)
if !strings.Contains(r.UserAgent(), "curl") {
web.Error404(utils.MainSite(r.Host), w)
} else {
fmt.Fprintln(w, "file not found")
}
}
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func RobotsTxt(w http.ResponseWriter, r *http.Request) {
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data, _ := web.AssetsGetFile("robots.txt")
w.Write(data)
}