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e0fe8a8ab4
Backport #27446 by @sryze
storageHandler() is written as a middleware but is used as an endpoint
handler, and thus `next` is actually `nil`, which causes a null pointer
dereference when a request URL does not match the pattern (where it
calls `next.ServerHTTP()`).
Example CURL command to trigger the panic:
```
curl -I "http://yourhost/gitea//avatars/a"
```
Fixes #27409
---
Note: the diff looks big but it's actually a small change - all I did
was to remove the outer closure (and one level of indentation) ~and
removed the HTTP method and pattern checks as they seem redundant
because go-chi already does those checks~. You might want to check "Hide
whitespace" when reviewing it.
Alternative solution (a bit simpler): append `, misc.DummyOK` to the
route declarations that utilize `storageHandler()` - this makes it
return an empty response when the URL is invalid. I've tested this one
and it works too. Or maybe it would be better to return a 400 error in
that case (?)
Co-authored-by: Sergey Zolotarev <sryze@outlook.com>
(cherry picked from commit 4ffa683820)
98 lines
3.2 KiB
Go
98 lines
3.2 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package web
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import (
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"errors"
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"fmt"
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"net/http"
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"os"
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"path"
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"strings"
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"code.gitea.io/gitea/modules/httpcache"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/storage"
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"code.gitea.io/gitea/modules/util"
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"code.gitea.io/gitea/modules/web/routing"
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)
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func storageHandler(storageSetting *setting.Storage, prefix string, objStore storage.ObjectStorage) http.HandlerFunc {
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prefix = strings.Trim(prefix, "/")
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funcInfo := routing.GetFuncInfo(storageHandler, prefix)
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if storageSetting.MinioConfig.ServeDirect {
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return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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if req.Method != "GET" && req.Method != "HEAD" {
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http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
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return
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}
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if !strings.HasPrefix(req.URL.Path, "/"+prefix+"/") {
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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routing.UpdateFuncInfo(req.Context(), funcInfo)
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rPath := strings.TrimPrefix(req.URL.Path, "/"+prefix+"/")
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rPath = util.PathJoinRelX(rPath)
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u, err := objStore.URL(rPath, path.Base(rPath))
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if err != nil {
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if os.IsNotExist(err) || errors.Is(err, os.ErrNotExist) {
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log.Warn("Unable to find %s %s", prefix, rPath)
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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log.Error("Error whilst getting URL for %s %s. Error: %v", prefix, rPath, err)
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http.Error(w, fmt.Sprintf("Error whilst getting URL for %s %s", prefix, rPath), http.StatusInternalServerError)
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return
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}
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http.Redirect(w, req, u.String(), http.StatusTemporaryRedirect)
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})
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}
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return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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if req.Method != "GET" && req.Method != "HEAD" {
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http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
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return
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}
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if !strings.HasPrefix(req.URL.Path, "/"+prefix+"/") {
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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routing.UpdateFuncInfo(req.Context(), funcInfo)
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rPath := strings.TrimPrefix(req.URL.Path, "/"+prefix+"/")
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rPath = util.PathJoinRelX(rPath)
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if rPath == "" || rPath == "." {
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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fi, err := objStore.Stat(rPath)
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if err != nil {
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if os.IsNotExist(err) || errors.Is(err, os.ErrNotExist) {
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log.Warn("Unable to find %s %s", prefix, rPath)
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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log.Error("Error whilst opening %s %s. Error: %v", prefix, rPath, err)
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http.Error(w, fmt.Sprintf("Error whilst opening %s %s", prefix, rPath), http.StatusInternalServerError)
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return
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}
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fr, err := objStore.Open(rPath)
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if err != nil {
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log.Error("Error whilst opening %s %s. Error: %v", prefix, rPath, err)
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http.Error(w, fmt.Sprintf("Error whilst opening %s %s", prefix, rPath), http.StatusInternalServerError)
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return
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}
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defer fr.Close()
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httpcache.ServeContentWithCacheControl(w, req, path.Base(rPath), fi.ModTime(), fr)
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})
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}
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