linx-server/fileserve.go

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package main
import (
"fmt"
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"net/http"
"net/url"
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"strconv"
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"strings"
"time"
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"github.com/andreimarcu/linx-server/backends"
"github.com/andreimarcu/linx-server/expiry"
"github.com/andreimarcu/linx-server/httputil"
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"github.com/zenazn/goji/web"
)
func fileServeHandler(c web.C, w http.ResponseWriter, r *http.Request) {
fileName := c.URLParams["name"]
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metadata, err := checkFile(fileName)
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if err == backends.NotFoundErr {
notFoundHandler(c, w, r)
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return
} else if err != nil {
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oopsHandler(c, w, r, RespAUTO, "Corrupt metadata.")
return
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}
if src, err := checkAccessKey(r, &metadata); err != nil {
// remove invalid cookie
if src == accessKeySourceCookie {
setAccessKeyCookies(w, getSiteURL(r), fileName, "", time.Unix(0, 0))
}
unauthorizedHandler(c, w, r)
return
}
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if !Config.allowHotlink {
referer := r.Header.Get("Referer")
u, _ := url.Parse(referer)
p, _ := url.Parse(getSiteURL(r))
if referer != "" && !sameOrigin(u, p) {
http.Redirect(w, r, Config.sitePath+fileName, 303)
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return
}
}
w.Header().Set("Content-Security-Policy", Config.fileContentSecurityPolicy)
w.Header().Set("Referrer-Policy", Config.fileReferrerPolicy)
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w.Header().Set("Content-Type", metadata.Mimetype)
w.Header().Set("Content-Length", strconv.FormatInt(metadata.Size, 10))
w.Header().Set("Etag", fmt.Sprintf("\"%s\"", metadata.Sha256sum))
w.Header().Set("Cache-Control", "public, no-cache")
modtime := time.Unix(0, 0)
if done := httputil.CheckPreconditions(w, r, modtime); done == true {
return
}
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if r.Method != "HEAD" {
storageBackend.ServeFile(fileName, w, r)
if err != nil {
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oopsHandler(c, w, r, RespAUTO, err.Error())
return
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}
}
}
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func staticHandler(c web.C, w http.ResponseWriter, r *http.Request) {
path := r.URL.Path
if path[len(path)-1:] == "/" {
notFoundHandler(c, w, r)
return
} else {
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if path == "/favicon.ico" {
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path = Config.sitePath + "/static/images/favicon.gif"
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}
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filePath := strings.TrimPrefix(path, Config.sitePath+"static/")
file, err := staticBox.Open(filePath)
if err != nil {
notFoundHandler(c, w, r)
return
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}
w.Header().Set("Etag", fmt.Sprintf("\"%s\"", timeStartedStr))
w.Header().Set("Cache-Control", "public, max-age=86400")
http.ServeContent(w, r, filePath, timeStarted, file)
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return
}
}
func checkFile(filename string) (metadata backends.Metadata, err error) {
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metadata, err = storageBackend.Head(filename)
if err != nil {
return
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}
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if expiry.IsTsExpired(metadata.Expiry) {
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storageBackend.Delete(filename)
err = backends.NotFoundErr
return
}
return
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}