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access.go
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access.go
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package main
import (
"encoding/json"
"errors"
"log"
"net/http"
"net/url"
"path"
"regexp"
"strings"
"time"
"github.com/andreimarcu/linx-server/backends"
"github.com/flosch/pongo2"
"github.com/zenazn/goji/web"
)
type accessKeySource int
const (
accessKeySourceNone accessKeySource = iota
accessKeySourceCookie
accessKeySourceHeader
accessKeySourceForm
accessKeySourceQuery
)
const accessKeyHeaderName = "Linx-Access-Key"
const accessKeyParamName = "access_key"
var (
errInvalidAccessKey = errors.New("invalid access key")
cliUserAgentRe = regexp.MustCompile("(?i)(lib)?curl|wget")
)
func checkAccessKey(r *http.Request, metadata *backends.Metadata) (accessKeySource, error) {
key := metadata.AccessKey
if key == "" {
return accessKeySourceNone, nil
}
cookieKey, err := r.Cookie(accessKeyHeaderName)
if err == nil {
if cookieKey.Value == key {
return accessKeySourceCookie, nil
}
return accessKeySourceCookie, errInvalidAccessKey
}
headerKey := r.Header.Get(accessKeyHeaderName)
if headerKey == key {
return accessKeySourceHeader, nil
} else if headerKey != "" {
return accessKeySourceHeader, errInvalidAccessKey
}
formKey := r.PostFormValue(accessKeyParamName)
if formKey == key {
return accessKeySourceForm, nil
} else if formKey != "" {
return accessKeySourceForm, errInvalidAccessKey
}
queryKey := r.URL.Query().Get(accessKeyParamName)
if queryKey == key {
return accessKeySourceQuery, nil
} else if formKey != "" {
return accessKeySourceQuery, errInvalidAccessKey
}
return accessKeySourceNone, errInvalidAccessKey
}
func setAccessKeyCookies(w http.ResponseWriter, siteURL, fileName, value string, expires time.Time) {
u, err := url.Parse(siteURL)
if err != nil {
log.Printf("cant parse siteURL (%v): %v", siteURL, err)
return
}
cookie := http.Cookie{
Name: accessKeyHeaderName,
Value: value,
HttpOnly: true,
Domain: u.Hostname(),
Expires: expires,
}
cookie.Path = path.Join(u.Path, fileName)
http.SetCookie(w, &cookie)
cookie.Path = path.Join(u.Path, Config.selifPath, fileName)
http.SetCookie(w, &cookie)
}
func fileAccessHandler(c web.C, w http.ResponseWriter, r *http.Request) {
if !Config.noDirectAgents && cliUserAgentRe.MatchString(r.Header.Get("User-Agent")) && !strings.EqualFold("application/json", r.Header.Get("Accept")) {
fileServeHandler(c, w, r)
return
}
fileName := c.URLParams["name"]
metadata, err := checkFile(fileName)
if err == backends.NotFoundErr {
notFoundHandler(c, w, r)
return
} else if err != nil {
oopsHandler(c, w, r, RespAUTO, "Corrupt metadata.")
return
}
if src, err := checkAccessKey(r, &metadata); err != nil {
// remove invalid cookie
if src == accessKeySourceCookie {
setAccessKeyCookies(w, getSiteURL(r), fileName, "", time.Unix(0, 0))
}
if strings.EqualFold("application/json", r.Header.Get("Accept")) {
dec := json.NewEncoder(w)
_ = dec.Encode(map[string]string{
"error": errInvalidAccessKey.Error(),
})
return
}
_ = renderTemplate(Templates["access.html"], pongo2.Context{
"filename": fileName,
"accesspath": fileName,
}, r, w)
return
}
if metadata.AccessKey != "" {
var expiry time.Time
if Config.accessKeyCookieExpiry != 0 {
expiry = time.Now().Add(time.Duration(Config.accessKeyCookieExpiry) * time.Second)
}
setAccessKeyCookies(w, getSiteURL(r), fileName, metadata.AccessKey, expiry)
}
fileDisplayHandler(c, w, r, fileName, metadata)
}