416 lines
11 KiB
Go
416 lines
11 KiB
Go
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"net/url"
|
|
"path"
|
|
"path/filepath"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
"log"
|
|
|
|
"github.com/andreimarcu/linx-server/auth/apikeys"
|
|
"github.com/andreimarcu/linx-server/backends"
|
|
"github.com/andreimarcu/linx-server/expiry"
|
|
"github.com/dchest/uniuri"
|
|
"github.com/gabriel-vasile/mimetype"
|
|
"github.com/zenazn/goji/web"
|
|
)
|
|
var FileTooLargeError = errors.New("File too large.")
|
|
var fileBlacklist = map[string]bool{
|
|
"favicon.ico": true,
|
|
"index.htm": true,
|
|
"index.html": true,
|
|
"index.php": true,
|
|
"robots.txt": true,
|
|
"crossdomain.xml": true,
|
|
}
|
|
|
|
// Describes metadata directly from the user request
|
|
type UploadRequest struct {
|
|
src io.Reader
|
|
size int64
|
|
filename string
|
|
expiry time.Duration // Seconds until expiry, 0 = never
|
|
deleteKey string // Empty string if not defined
|
|
randomBarename bool
|
|
accessKey string // Empty string if not defined
|
|
srcIp string // Empty string if not defined
|
|
}
|
|
|
|
// Metadata associated with a file as it would actually be stored
|
|
type Upload struct {
|
|
Filename string // Final filename on disk
|
|
Metadata backends.Metadata
|
|
}
|
|
|
|
func uploadPostHandler(c web.C, w http.ResponseWriter, r *http.Request) {
|
|
if !strictReferrerCheck(r, getSiteURL(r), []string{"Linx-Delete-Key", "Linx-Expiry", "Linx-Randomize", "X-Requested-With"}) {
|
|
badRequestHandler(c, w, r, RespAUTO, "")
|
|
return
|
|
}
|
|
|
|
upReq := UploadRequest{}
|
|
uploadHeaderProcess(r, &upReq)
|
|
|
|
contentType := r.Header.Get("Content-Type")
|
|
if strings.HasPrefix(contentType, "multipart/form-data") {
|
|
file, headers, err := r.FormFile("file")
|
|
if err != nil {
|
|
oopsHandler(c, w, r, RespHTML, "Could not upload file.")
|
|
return
|
|
}
|
|
defer file.Close()
|
|
|
|
upReq.src = file
|
|
upReq.size = headers.Size
|
|
upReq.filename = headers.Filename
|
|
} else {
|
|
if r.PostFormValue("content") == "" {
|
|
badRequestHandler(c, w, r, RespAUTO, "Empty file")
|
|
return
|
|
}
|
|
extension := r.PostFormValue("extension")
|
|
if extension == "" {
|
|
extension = "txt"
|
|
}
|
|
|
|
content := r.PostFormValue("content")
|
|
|
|
upReq.src = strings.NewReader(content)
|
|
upReq.size = int64(len(content))
|
|
upReq.filename = r.PostFormValue("filename") + "." + extension
|
|
}
|
|
|
|
upReq.expiry = parseExpiry(r.PostFormValue("expires"))
|
|
upReq.accessKey = r.PostFormValue(accessKeyParamName)
|
|
if r.PostFormValue("randomize") == "true" {
|
|
upReq.randomBarename = true
|
|
}
|
|
upReq.srcIp = r.Header.Get("X-Forwarded-For")
|
|
if upReq.contentSize > 0 {
|
|
upReq.size = upReq.contentSize
|
|
}
|
|
upload, err := processUpload(upReq)
|
|
|
|
if strings.EqualFold("application/json", r.Header.Get("Accept")) {
|
|
if err == FileTooLargeError || err == backends.FileEmptyError {
|
|
badRequestHandler(c, w, r, RespJSON, err.Error())
|
|
return
|
|
} else if err != nil {
|
|
oopsHandler(c, w, r, RespJSON, "Could not upload file: "+err.Error())
|
|
return
|
|
}
|
|
|
|
js := generateJSONresponse(upload, r)
|
|
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
|
|
w.Write(js)
|
|
} else {
|
|
if err == FileTooLargeError || err == backends.FileEmptyError {
|
|
badRequestHandler(c, w, r, RespHTML, err.Error())
|
|
return
|
|
} else if err != nil {
|
|
oopsHandler(c, w, r, RespHTML, "Could not upload file: "+err.Error())
|
|
return
|
|
}
|
|
|
|
http.Redirect(w, r, Config.sitePath+upload.Filename, 303)
|
|
}
|
|
}
|
|
|
|
func uploadPutHandler(c web.C, w http.ResponseWriter, r *http.Request) {
|
|
upReq := UploadRequest{}
|
|
uploadHeaderProcess(r, &upReq)
|
|
|
|
defer r.Body.Close()
|
|
upReq.filename = c.URLParams["name"]
|
|
upReq.src = http.MaxBytesReader(w, r.Body, Config.maxSize)
|
|
upReq.srcIp = r.Header.Get("X-Forwarded-For")
|
|
if upReq.contentSize > 0 {
|
|
upReq.size = upReq.contentSize
|
|
}
|
|
upload, err := processUpload(upReq)
|
|
|
|
if strings.EqualFold("application/json", r.Header.Get("Accept")) {
|
|
if err == FileTooLargeError || err == backends.FileEmptyError {
|
|
badRequestHandler(c, w, r, RespJSON, err.Error())
|
|
return
|
|
} else if err != nil {
|
|
oopsHandler(c, w, r, RespJSON, "Could not upload file: "+err.Error())
|
|
return
|
|
}
|
|
|
|
js := generateJSONresponse(upload, r)
|
|
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
|
|
w.Write(js)
|
|
} else {
|
|
if err == FileTooLargeError || err == backends.FileEmptyError {
|
|
badRequestHandler(c, w, r, RespPLAIN, err.Error())
|
|
return
|
|
} else if err != nil {
|
|
oopsHandler(c, w, r, RespPLAIN, "Could not upload file: "+err.Error())
|
|
return
|
|
}
|
|
|
|
fmt.Fprintf(w, "%s\n", getSiteURL(r)+upload.Filename)
|
|
}
|
|
}
|
|
|
|
func uploadRemote(c web.C, w http.ResponseWriter, r *http.Request) {
|
|
if Config.remoteAuthFile != "" {
|
|
key := r.FormValue("key")
|
|
if key == "" && Config.basicAuth {
|
|
_, password, ok := r.BasicAuth()
|
|
if ok {
|
|
key = password
|
|
}
|
|
}
|
|
result, err := apikeys.CheckAuth(remoteAuthKeys, key)
|
|
if err != nil || !result {
|
|
if Config.basicAuth {
|
|
rs := ""
|
|
if Config.siteName != "" {
|
|
rs = fmt.Sprintf(` realm="%s"`, Config.siteName)
|
|
}
|
|
w.Header().Set("WWW-Authenticate", `Basic`+rs)
|
|
}
|
|
unauthorizedHandler(c, w, r)
|
|
return
|
|
}
|
|
}
|
|
|
|
if r.FormValue("url") == "" {
|
|
http.Redirect(w, r, Config.sitePath, 303)
|
|
return
|
|
}
|
|
|
|
upReq := UploadRequest{}
|
|
grabUrl, _ := url.Parse(r.FormValue("url"))
|
|
directURL := r.FormValue("direct_url") == "yes"
|
|
|
|
resp, err := http.Get(grabUrl.String())
|
|
if err != nil {
|
|
oopsHandler(c, w, r, RespAUTO, "Could not retrieve URL")
|
|
return
|
|
}
|
|
|
|
upReq.filename = filepath.Base(grabUrl.Path)
|
|
upReq.src = http.MaxBytesReader(w, resp.Body, Config.maxSize)
|
|
upReq.deleteKey = r.FormValue("deletekey")
|
|
upReq.accessKey = r.FormValue(accessKeyParamName)
|
|
upReq.randomBarename = r.FormValue("randomize") == "yes"
|
|
upReq.expiry = parseExpiry(r.FormValue("expiry"))
|
|
upReq.srcIp = r.Header.Get("X-Forwarded-For")
|
|
upload, err := processUpload(upReq)
|
|
|
|
if strings.EqualFold("application/json", r.Header.Get("Accept")) {
|
|
if err != nil {
|
|
oopsHandler(c, w, r, RespJSON, "Could not upload file: "+err.Error())
|
|
return
|
|
}
|
|
|
|
js := generateJSONresponse(upload, r)
|
|
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
|
|
w.Write(js)
|
|
} else {
|
|
if err != nil {
|
|
oopsHandler(c, w, r, RespHTML, "Could not upload file: "+err.Error())
|
|
return
|
|
}
|
|
|
|
if directURL {
|
|
http.Redirect(w, r, Config.sitePath+Config.selifPath+upload.Filename, 303)
|
|
} else {
|
|
http.Redirect(w, r, Config.sitePath+upload.Filename, 303)
|
|
}
|
|
}
|
|
}
|
|
|
|
func uploadHeaderProcess(r *http.Request, upReq *UploadRequest) {
|
|
if r.Header.Get("Linx-Randomize") == "yes" {
|
|
upReq.randomBarename = true
|
|
}
|
|
upReq.deleteKey = r.Header.Get("Linx-Delete-Key")
|
|
upReq.accessKey = r.Header.Get(accessKeyHeaderName)
|
|
// Get seconds until expiry. Non-integer responses never expire.
|
|
expStr := r.Header.Get("Linx-Expiry")
|
|
upReq.expiry = parseExpiry(expStr)
|
|
}
|
|
|
|
func processUpload(upReq UploadRequest) (upload Upload, err error) {
|
|
if upReq.size > Config.maxSize {
|
|
return upload, FileTooLargeError
|
|
}
|
|
|
|
// Determine the appropriate filename
|
|
barename, extension := barePlusExt(upReq.filename)
|
|
randomize := false
|
|
|
|
// Randomize the "barename" (filename without extension) if needed
|
|
if upReq.randomBarename || len(barename) == 0 {
|
|
barename = generateBarename()
|
|
randomize = true
|
|
}
|
|
|
|
var header []byte
|
|
if len(extension) == 0 {
|
|
// Pull the first 512 bytes off for use in MIME detection
|
|
header = make([]byte, 512)
|
|
n, _ := upReq.src.Read(header)
|
|
if n == 0 {
|
|
return upload, backends.FileEmptyError
|
|
}
|
|
header = header[:n]
|
|
|
|
// Determine the type of file from header
|
|
kind := mimetype.Detect(header)
|
|
if len(kind.Extension()) < 2 {
|
|
extension = "file"
|
|
} else {
|
|
extension = kind.Extension()[1:] // remove leading "."
|
|
}
|
|
}
|
|
|
|
upload.Filename = strings.Join([]string{barename, extension}, ".")
|
|
upload.Filename = strings.Replace(upload.Filename, " ", "", -1)
|
|
|
|
fileexists, _ := storageBackend.Exists(upload.Filename)
|
|
|
|
// Check if the delete key matches, in which case overwrite
|
|
if fileexists {
|
|
metad, merr := storageBackend.Head(upload.Filename)
|
|
if merr == nil {
|
|
if upReq.deleteKey == metad.DeleteKey {
|
|
fileexists = false
|
|
} else if Config.forceRandomFilename == true {
|
|
// the file exists
|
|
// the delete key doesn't match
|
|
// force random filenames is enabled
|
|
randomize = true
|
|
}
|
|
}
|
|
} else if Config.forceRandomFilename == true {
|
|
// the file doesn't exist
|
|
// force random filenames is enabled
|
|
randomize = true
|
|
|
|
// set fileexists to true to generate a new barename
|
|
fileexists = true
|
|
}
|
|
|
|
for fileexists {
|
|
if randomize {
|
|
barename = generateBarename()
|
|
} else {
|
|
counter, err := strconv.Atoi(string(barename[len(barename)-1]))
|
|
if err != nil {
|
|
barename = barename + "1"
|
|
} else {
|
|
barename = barename[:len(barename)-1] + strconv.Itoa(counter+1)
|
|
}
|
|
}
|
|
upload.Filename = strings.Join([]string{barename, extension}, ".")
|
|
|
|
fileexists, err = storageBackend.Exists(upload.Filename)
|
|
}
|
|
|
|
if fileBlacklist[strings.ToLower(upload.Filename)] {
|
|
return upload, errors.New("Prohibited filename")
|
|
}
|
|
|
|
// Get the rest of the metadata needed for storage
|
|
var fileExpiry time.Time
|
|
if upReq.expiry == 0 {
|
|
fileExpiry = expiry.NeverExpire
|
|
} else {
|
|
fileExpiry = time.Now().Add(upReq.expiry)
|
|
}
|
|
|
|
if upReq.deleteKey == "" {
|
|
upReq.deleteKey = uniuri.NewLen(30)
|
|
}
|
|
upload.Metadata, err = storageBackend.Put(upload.Filename, io.MultiReader(bytes.NewReader(header), upReq.src), fileExpiry, upReq.deleteKey, upReq.accessKey, upReq.srcIp)
|
|
if err != nil {
|
|
return upload, err
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func generateBarename() string {
|
|
return uniuri.NewLenChars(8, []byte("abcdefghijklmnopqrstuvwxyz0123456789"))
|
|
}
|
|
|
|
func generateJSONresponse(upload Upload, r *http.Request) []byte {
|
|
js, _ := json.Marshal(map[string]string{
|
|
"url": getSiteURL(r) + upload.Filename,
|
|
"direct_url": getSiteURL(r) + Config.selifPath + upload.Filename,
|
|
"filename": upload.Filename,
|
|
"delete_key": upload.Metadata.DeleteKey,
|
|
"access_key": upload.Metadata.AccessKey,
|
|
"expiry": strconv.FormatInt(upload.Metadata.Expiry.Unix(), 10),
|
|
"size": strconv.FormatInt(upload.Metadata.Size, 10),
|
|
"mimetype": upload.Metadata.Mimetype,
|
|
"sha256sum": upload.Metadata.Sha256sum,
|
|
})
|
|
|
|
return js
|
|
}
|
|
|
|
var bareRe = regexp.MustCompile(`[^A-Za-z0-9\-]`)
|
|
var extRe = regexp.MustCompile(`[^A-Za-z0-9\-\.]`)
|
|
var compressedExts = map[string]bool{
|
|
".bz2": true,
|
|
".gz": true,
|
|
".xz": true,
|
|
}
|
|
var archiveExts = map[string]bool{
|
|
".tar": true,
|
|
}
|
|
|
|
func barePlusExt(filename string) (barename, extension string) {
|
|
filename = strings.TrimSpace(filename)
|
|
filename = strings.ToLower(filename)
|
|
|
|
extension = path.Ext(filename)
|
|
barename = filename[:len(filename)-len(extension)]
|
|
if compressedExts[extension] {
|
|
ext2 := path.Ext(barename)
|
|
if archiveExts[ext2] {
|
|
barename = barename[:len(barename)-len(ext2)]
|
|
extension = ext2 + extension
|
|
}
|
|
}
|
|
|
|
extension = extRe.ReplaceAllString(extension, "")
|
|
barename = bareRe.ReplaceAllString(barename, "")
|
|
|
|
extension = strings.Trim(extension, "-.")
|
|
barename = strings.Trim(barename, "-")
|
|
|
|
return
|
|
}
|
|
|
|
func parseExpiry(expStr string) time.Duration {
|
|
if expStr == "" {
|
|
return time.Duration(Config.maxExpiry) * time.Second
|
|
} else {
|
|
fileExpiry, err := strconv.ParseUint(expStr, 10, 64)
|
|
if err != nil {
|
|
return time.Duration(Config.maxExpiry) * time.Second
|
|
} else {
|
|
if Config.maxExpiry > 0 && (fileExpiry > Config.maxExpiry || fileExpiry == 0) {
|
|
fileExpiry = Config.maxExpiry
|
|
}
|
|
return time.Duration(fileExpiry) * time.Second
|
|
}
|
|
}
|
|
}
|