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-rw-r--r--modules/caddyhttp/staticfiles/browse.go205
-rw-r--r--modules/caddyhttp/staticfiles/matcher.go54
-rw-r--r--modules/caddyhttp/staticfiles/staticfiles.go299
3 files changed, 555 insertions, 3 deletions
diff --git a/modules/caddyhttp/staticfiles/browse.go b/modules/caddyhttp/staticfiles/browse.go
new file mode 100644
index 0000000..15ff105
--- /dev/null
+++ b/modules/caddyhttp/staticfiles/browse.go
@@ -0,0 +1,205 @@
+package staticfiles
+
+import (
+ "net/http"
+)
+
+// Browse configures directory browsing.
+type Browse struct {
+}
+
+// ServeHTTP determines if the request is for this plugin, and if all prerequisites are met.
+// If so, control is handed over to ServeListing.
+func (b Browse) ServeHTTP(w http.ResponseWriter, r *http.Request) error {
+ // TODO: convert this handler
+ return nil
+
+ // // Browse works on existing directories; delegate everything else
+ // requestedFilepath, err := bc.Fs.Root.Open(r.URL.Path)
+ // if err != nil {
+ // switch {
+ // case os.IsPermission(err):
+ // return http.StatusForbidden, err
+ // case os.IsExist(err):
+ // return http.StatusNotFound, err
+ // default:
+ // return b.Next.ServeHTTP(w, r)
+ // }
+ // }
+ // defer requestedFilepath.Close()
+
+ // info, err := requestedFilepath.Stat()
+ // if err != nil {
+ // switch {
+ // case os.IsPermission(err):
+ // return http.StatusForbidden, err
+ // case os.IsExist(err):
+ // return http.StatusGone, err
+ // default:
+ // return b.Next.ServeHTTP(w, r)
+ // }
+ // }
+ // if !info.IsDir() {
+ // return b.Next.ServeHTTP(w, r)
+ // }
+
+ // // Do not reply to anything else because it might be nonsensical
+ // switch r.Method {
+ // case http.MethodGet, http.MethodHead:
+ // // proceed, noop
+ // case "PROPFIND", http.MethodOptions:
+ // return http.StatusNotImplemented, nil
+ // default:
+ // return b.Next.ServeHTTP(w, r)
+ // }
+
+ // // Browsing navigation gets messed up if browsing a directory
+ // // that doesn't end in "/" (which it should, anyway)
+ // u := *r.URL
+ // if u.Path == "" {
+ // u.Path = "/"
+ // }
+ // if u.Path[len(u.Path)-1] != '/' {
+ // u.Path += "/"
+ // http.Redirect(w, r, u.String(), http.StatusMovedPermanently)
+ // return http.StatusMovedPermanently, nil
+ // }
+
+ // return b.ServeListing(w, r, requestedFilepath, bc)
+}
+
+// func (b Browse) loadDirectoryContents(requestedFilepath http.File, urlPath string, config *Config) (*Listing, bool, error) {
+// files, err := requestedFilepath.Readdir(-1)
+// if err != nil {
+// return nil, false, err
+// }
+
+// // Determine if user can browse up another folder
+// var canGoUp bool
+// curPathDir := path.Dir(strings.TrimSuffix(urlPath, "/"))
+// for _, other := range b.Configs {
+// if strings.HasPrefix(curPathDir, other.PathScope) {
+// canGoUp = true
+// break
+// }
+// }
+
+// // Assemble listing of directory contents
+// listing, hasIndex := directoryListing(files, canGoUp, urlPath, config)
+
+// return &listing, hasIndex, nil
+// }
+
+// // handleSortOrder gets and stores for a Listing the 'sort' and 'order',
+// // and reads 'limit' if given. The latter is 0 if not given.
+// //
+// // This sets Cookies.
+// func (b Browse) handleSortOrder(w http.ResponseWriter, r *http.Request, scope string) (sort string, order string, limit int, err error) {
+// sort, order, limitQuery := r.URL.Query().Get("sort"), r.URL.Query().Get("order"), r.URL.Query().Get("limit")
+
+// // If the query 'sort' or 'order' is empty, use defaults or any values previously saved in Cookies
+// switch sort {
+// case "":
+// sort = sortByNameDirFirst
+// if sortCookie, sortErr := r.Cookie("sort"); sortErr == nil {
+// sort = sortCookie.Value
+// }
+// case sortByName, sortByNameDirFirst, sortBySize, sortByTime:
+// http.SetCookie(w, &http.Cookie{Name: "sort", Value: sort, Path: scope, Secure: r.TLS != nil})
+// }
+
+// switch order {
+// case "":
+// order = "asc"
+// if orderCookie, orderErr := r.Cookie("order"); orderErr == nil {
+// order = orderCookie.Value
+// }
+// case "asc", "desc":
+// http.SetCookie(w, &http.Cookie{Name: "order", Value: order, Path: scope, Secure: r.TLS != nil})
+// }
+
+// if limitQuery != "" {
+// limit, err = strconv.Atoi(limitQuery)
+// if err != nil { // if the 'limit' query can't be interpreted as a number, return err
+// return
+// }
+// }
+
+// return
+// }
+
+// // ServeListing returns a formatted view of 'requestedFilepath' contents'.
+// func (b Browse) ServeListing(w http.ResponseWriter, r *http.Request, requestedFilepath http.File, bc *Config) (int, error) {
+// listing, containsIndex, err := b.loadDirectoryContents(requestedFilepath, r.URL.Path, bc)
+// if err != nil {
+// switch {
+// case os.IsPermission(err):
+// return http.StatusForbidden, err
+// case os.IsExist(err):
+// return http.StatusGone, err
+// default:
+// return http.StatusInternalServerError, err
+// }
+// }
+// if containsIndex && !b.IgnoreIndexes { // directory isn't browsable
+// return b.Next.ServeHTTP(w, r)
+// }
+// listing.Context = httpserver.Context{
+// Root: bc.Fs.Root,
+// Req: r,
+// URL: r.URL,
+// }
+// listing.User = bc.Variables
+
+// // Copy the query values into the Listing struct
+// var limit int
+// listing.Sort, listing.Order, limit, err = b.handleSortOrder(w, r, bc.PathScope)
+// if err != nil {
+// return http.StatusBadRequest, err
+// }
+
+// listing.applySort()
+
+// if limit > 0 && limit <= len(listing.Items) {
+// listing.Items = listing.Items[:limit]
+// listing.ItemsLimitedTo = limit
+// }
+
+// var buf *bytes.Buffer
+// acceptHeader := strings.ToLower(strings.Join(r.Header["Accept"], ","))
+// switch {
+// case strings.Contains(acceptHeader, "application/json"):
+// if buf, err = b.formatAsJSON(listing, bc); err != nil {
+// return http.StatusInternalServerError, err
+// }
+// w.Header().Set("Content-Type", "application/json; charset=utf-8")
+
+// default: // There's no 'application/json' in the 'Accept' header; browse normally
+// if buf, err = b.formatAsHTML(listing, bc); err != nil {
+// return http.StatusInternalServerError, err
+// }
+// w.Header().Set("Content-Type", "text/html; charset=utf-8")
+
+// }
+
+// _, _ = buf.WriteTo(w)
+
+// return http.StatusOK, nil
+// }
+
+// func (b Browse) formatAsJSON(listing *Listing, bc *Config) (*bytes.Buffer, error) {
+// marsh, err := json.Marshal(listing.Items)
+// if err != nil {
+// return nil, err
+// }
+
+// buf := new(bytes.Buffer)
+// _, err = buf.Write(marsh)
+// return buf, err
+// }
+
+// func (b Browse) formatAsHTML(listing *Listing, bc *Config) (*bytes.Buffer, error) {
+// buf := new(bytes.Buffer)
+// err := bc.Template.Execute(buf, listing)
+// return buf, err
+// }
diff --git a/modules/caddyhttp/staticfiles/matcher.go b/modules/caddyhttp/staticfiles/matcher.go
new file mode 100644
index 0000000..cccf54b
--- /dev/null
+++ b/modules/caddyhttp/staticfiles/matcher.go
@@ -0,0 +1,54 @@
+package staticfiles
+
+import (
+ "net/http"
+ "os"
+ "path/filepath"
+
+ "bitbucket.org/lightcodelabs/caddy2"
+ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp"
+)
+
+func init() {
+ caddy2.RegisterModule(caddy2.Module{
+ Name: "http.matchers.file",
+ New: func() (interface{}, error) { return new(FileMatcher), nil },
+ })
+}
+
+// TODO: Not sure how to do this well; we'd need the ability to
+// hide files, etc...
+// TODO: Also consider a feature to match directory that
+// contains a certain filename (use filepath.Glob), useful
+// if wanting to map directory-URI requests where the dir
+// has index.php to PHP backends, for example (although this
+// can effectively be done with rehandling already)
+type FileMatcher struct {
+ Root string `json:"root"`
+ Path string `json:"path"`
+ Flags []string `json:"flags"`
+}
+
+func (m FileMatcher) Match(r *http.Request) bool {
+ // TODO: sanitize path
+ fullPath := filepath.Join(m.Root, m.Path)
+ var match bool
+ if len(m.Flags) > 0 {
+ match = true
+ fi, err := os.Stat(fullPath)
+ for _, f := range m.Flags {
+ switch f {
+ case "EXIST":
+ match = match && os.IsNotExist(err)
+ case "DIR":
+ match = match && err == nil && fi.IsDir()
+ default:
+ match = false
+ }
+ }
+ }
+ return match
+}
+
+// Interface guard
+var _ caddyhttp.RequestMatcher = (*FileMatcher)(nil)
diff --git a/modules/caddyhttp/staticfiles/staticfiles.go b/modules/caddyhttp/staticfiles/staticfiles.go
index 2a6fe37..0ef3c63 100644
--- a/modules/caddyhttp/staticfiles/staticfiles.go
+++ b/modules/caddyhttp/staticfiles/staticfiles.go
@@ -1,7 +1,15 @@
package staticfiles
import (
+ "fmt"
+ weakrand "math/rand"
"net/http"
+ "os"
+ "path"
+ "path/filepath"
+ "strconv"
+ "strings"
+ "time"
"bitbucket.org/lightcodelabs/caddy2"
"bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp"
@@ -16,13 +24,298 @@ func init() {
// StaticFiles implements a static file server responder for Caddy.
type StaticFiles struct {
- Root string
+ Root string `json:"root"` // default is current directory
+ IndexNames []string `json:"index_names"`
+ Files []string `json:"files"` // all relative to the root; default is request URI path
+ SelectionPolicy string `json:"selection_policy"`
+ Fallback caddyhttp.RouteList `json:"fallback"`
+ Browse *Browse `json:"browse"`
+ Hide []string `json:"hide"`
+ Rehandle bool `json:"rehandle"` // issue a rehandle (internal redirect) if request is rewritten
+ // TODO: Etag
+ // TODO: Content negotiation
}
-func (sf StaticFiles) ServeHTTP(w http.ResponseWriter, r *http.Request) error {
- http.FileServer(http.Dir(sf.Root)).ServeHTTP(w, r)
+// Provision sets up the static files responder.
+func (sf *StaticFiles) Provision(ctx caddy2.Context) error {
+ if sf.Fallback != nil {
+ err := sf.Fallback.Provision(ctx)
+ if err != nil {
+ return fmt.Errorf("setting up fallback routes: %v", err)
+ }
+ }
+ if sf.IndexNames == nil {
+ sf.IndexNames = defaultIndexNames
+ }
return nil
}
+// Validate ensures that sf has a valid configuration.
+func (sf *StaticFiles) Validate() error {
+ switch sf.SelectionPolicy {
+ case "",
+ "first_existing",
+ "largest_size",
+ "smallest_size",
+ "most_recently_modified":
+ default:
+ return fmt.Errorf("unknown selection policy %s", sf.SelectionPolicy)
+ }
+ return nil
+}
+
+func (sf *StaticFiles) ServeHTTP(w http.ResponseWriter, r *http.Request) error {
+ // TODO: Prevent directory traversal, see https://play.golang.org/p/oh77BiVQFti
+
+ // http.FileServer(http.Dir(sf.Directory)).ServeHTTP(w, r)
+
+ //////////////
+
+ // TODO: Still needed?
+ // // Prevent absolute path access on Windows, e.g.: http://localhost:5000/C:\Windows\notepad.exe
+ // // TODO: does stdlib http.Dir handle this? see first check of http.Dir.Open()...
+ // if runtime.GOOS == "windows" && len(reqPath) > 0 && filepath.IsAbs(reqPath[1:]) {
+ // return caddyhttp.Error(http.StatusNotFound, fmt.Errorf("request path was absolute"))
+ // }
+
+ repl := r.Context().Value(caddy2.ReplacerCtxKey).(caddy2.Replacer)
+
+ // map the request to a filename
+ pathBefore := r.URL.Path
+ filename := sf.selectFile(r, repl)
+ if filename == "" {
+ // no files worked, so resort to fallback
+ if sf.Fallback != nil {
+ fallback := sf.Fallback.BuildCompositeRoute(w, r)
+ return fallback.ServeHTTP(w, r)
+ }
+ return caddyhttp.Error(http.StatusNotFound, nil)
+ }
+
+ // if the ultimate destination has changed, submit
+ // this request for a rehandling (internal redirect)
+ // if configured to do so
+ // TODO: double check this against https://docs.nginx.com/nginx/admin-guide/web-server/serving-static-content/
+ if r.URL.Path != pathBefore && sf.Rehandle {
+ return caddyhttp.ErrRehandle
+ }
+
+ // get information about the file
+ info, err := os.Stat(filename)
+ if err != nil {
+ if os.IsNotExist(err) {
+ return caddyhttp.Error(http.StatusNotFound, err)
+ } else if os.IsPermission(err) {
+ return caddyhttp.Error(http.StatusForbidden, err)
+ }
+ // TODO: treat this as resource exhaustion like with os.Open? Or unnecessary here?
+ return caddyhttp.Error(http.StatusInternalServerError, err)
+ }
+
+ // if the request mapped to a directory, see if
+ // there is an index file we can serve
+ if info.IsDir() && len(sf.IndexNames) > 0 {
+ filesToHide := sf.transformHidePaths(repl)
+
+ for _, indexPage := range sf.IndexNames {
+ indexPath := path.Join(filename, indexPage)
+ if fileIsHidden(indexPath, filesToHide) {
+ // pretend this file doesn't exist
+ continue
+ }
+
+ indexInfo, err := os.Stat(indexPath)
+ if err != nil {
+ continue
+ }
+
+ // we found an index file that might work,
+ // so rewrite the request path and, if
+ // configured, do an internal redirect
+ // TODO: I don't know if the logic for rewriting
+ // the URL here is the right logic
+ r.URL.Path = path.Join(r.URL.Path, indexPage)
+ if sf.Rehandle {
+ return caddyhttp.ErrRehandle
+ }
+
+ info = indexInfo
+ break
+ }
+ }
+
+ // if still referencing a directory, delegate
+ // to browse or return an error
+ if info.IsDir() {
+ if sf.Browse != nil {
+ return sf.Browse.ServeHTTP(w, r)
+ }
+ return caddyhttp.Error(http.StatusNotFound, nil)
+ }
+
+ // open the file
+ file, err := os.Open(info.Name())
+ if err != nil {
+ if os.IsNotExist(err) {
+ return caddyhttp.Error(http.StatusNotFound, err)
+ } else if os.IsPermission(err) {
+ return caddyhttp.Error(http.StatusForbidden, err)
+ }
+ // maybe the server is under load and ran out of file descriptors?
+ // have client wait arbitrary seconds to help prevent a stampede
+ backoff := weakrand.Intn(maxBackoff-minBackoff) + minBackoff
+ w.Header().Set("Retry-After", strconv.Itoa(backoff))
+ return caddyhttp.Error(http.StatusServiceUnavailable, err)
+ }
+ defer file.Close()
+
+ // TODO: Right now we return an invalid response if the
+ // request is for a directory and there is no index file
+ // or dir browsing; we should return a 404 I think...
+
+ // TODO: Etag?
+
+ // TODO: content negotiation? (brotli sidecar files, etc...)
+
+ // let the standard library do what it does best; note, however,
+ // that errors generated by ServeContent are written immediately
+ // to the response, so we cannot handle them (but errors here are rare)
+ http.ServeContent(w, r, info.Name(), info.ModTime(), file)
+
+ return nil
+}
+
+func (sf *StaticFiles) transformHidePaths(repl caddy2.Replacer) []string {
+ hide := make([]string, len(sf.Hide))
+ for i := range sf.Hide {
+ hide[i] = repl.ReplaceAll(sf.Hide[i], "")
+ }
+ return hide
+}
+
+func (sf *StaticFiles) selectFile(r *http.Request, repl caddy2.Replacer) string {
+ root := repl.ReplaceAll(sf.Root, "")
+ if root == "" {
+ root = "."
+ }
+
+ if sf.Files == nil {
+ return filepath.Join(root, r.URL.Path)
+ }
+
+ switch sf.SelectionPolicy {
+ // TODO: Make these policy names constants
+ case "", "first_existing":
+ filesToHide := sf.transformHidePaths(repl)
+ for _, f := range sf.Files {
+ suffix := repl.ReplaceAll(f, "")
+ // TODO: sanitize path
+ fullpath := filepath.Join(root, suffix)
+ if !fileIsHidden(fullpath, filesToHide) && fileExists(fullpath) {
+ r.URL.Path = suffix
+ return fullpath
+ }
+ }
+
+ case "largest_size":
+ var largestSize int64
+ var largestFilename string
+ var largestSuffix string
+ for _, f := range sf.Files {
+ suffix := repl.ReplaceAll(f, "")
+ // TODO: sanitize path
+ fullpath := filepath.Join(root, suffix)
+ info, err := os.Stat(fullpath)
+ if err == nil && info.Size() > largestSize {
+ largestSize = info.Size()
+ largestFilename = fullpath
+ largestSuffix = suffix
+ }
+ }
+ r.URL.Path = largestSuffix
+ return largestFilename
+
+ case "smallest_size":
+ var smallestSize int64
+ var smallestFilename string
+ var smallestSuffix string
+ for _, f := range sf.Files {
+ suffix := repl.ReplaceAll(f, "")
+ // TODO: sanitize path
+ fullpath := filepath.Join(root, suffix)
+ info, err := os.Stat(fullpath)
+ if err == nil && (smallestSize == 0 || info.Size() < smallestSize) {
+ smallestSize = info.Size()
+ smallestFilename = fullpath
+ smallestSuffix = suffix
+ }
+ }
+ r.URL.Path = smallestSuffix
+ return smallestFilename
+
+ case "most_recently_modified":
+ var recentDate time.Time
+ var recentFilename string
+ var recentSuffix string
+ for _, f := range sf.Files {
+ suffix := repl.ReplaceAll(f, "")
+ // TODO: sanitize path
+ fullpath := filepath.Join(root, suffix)
+ info, err := os.Stat(fullpath)
+ if err == nil &&
+ (recentDate.IsZero() || info.ModTime().After(recentDate)) {
+ recentDate = info.ModTime()
+ recentFilename = fullpath
+ recentSuffix = suffix
+ }
+ }
+ r.URL.Path = recentSuffix
+ return recentFilename
+ }
+
+ return ""
+}
+
+// fileExists returns true if file exists.
+func fileExists(file string) bool {
+ _, err := os.Stat(file)
+ return !os.IsNotExist(err)
+}
+
+func fileIsHidden(filename string, hide []string) bool {
+ nameOnly := filepath.Base(filename)
+ sep := string(filepath.Separator)
+
+ // see if file is hidden
+ for _, h := range hide {
+ // assuming h is a glob/shell-like pattern,
+ // use it to compare the whole file path;
+ // but if there is no separator in h, then
+ // just compare against the file's name
+ compare := filename
+ if !strings.Contains(h, sep) {
+ compare = nameOnly
+ }
+
+ hidden, err := filepath.Match(h, compare)
+ if err != nil {
+ // malformed pattern; fallback by checking prefix
+ if strings.HasPrefix(filename, h) {
+ return true
+ }
+ }
+ if hidden {
+ // file name or path matches hide pattern
+ return true
+ }
+ }
+
+ return false
+}
+
+var defaultIndexNames = []string{"index.html"}
+
+const minBackoff, maxBackoff = 2, 5
+
// Interface guard
var _ caddyhttp.Handler = (*StaticFiles)(nil)
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-06 09:43:37 +0000