// ServeHTTP implements the middlware.Handler interface.
func (i Internal) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
// Internal location requested? -> Not found.
for _, prefix := range i.Paths {
if middleware.Path(r.URL.Path).Matches(prefix) {
return http.StatusNotFound, nil
}
}
// Use internal response writer to ignore responses that will be
// redirected to internal locations
iw := internalResponseWriter{ResponseWriter: w}
status, err := i.Next.ServeHTTP(iw, r)
for c := 0; c < maxRedirectCount && isInternalRedirect(iw); c++ {
// Redirect - adapt request URL path and send it again
// "down the chain"
r.URL.Path = iw.Header().Get(redirectHeader)
iw.ClearHeader()
status, err = i.Next.ServeHTTP(iw, r)
}
if isInternalRedirect(iw) {
// Too many redirect cycles
iw.ClearHeader()
return http.StatusInternalServerError, nil
}
return status, err
}
// Rewrite rewrites the internal location of the current request.
func (r *RegexpRule) Rewrite(req *http.Request) bool {
rPath := req.URL.Path
// validate base
if !middleware.Path(rPath).Matches(r.Base) {
return false
}
// validate extensions
if !r.matchExt(rPath) {
return false
}
// validate regexp
if !r.MatchString(rPath[len(r.Base):]) {
return false
}
to := r.To
// check variables
for _, v := range regexpVars {
if strings.Contains(r.To, v) {
switch v {
case "{path}":
to = strings.Replace(to, v, req.URL.Path[1:], -1)
case "{query}":
to = strings.Replace(to, v, req.URL.RawQuery, -1)
case "{frag}":
to = strings.Replace(to, v, req.URL.Fragment, -1)
case "{file}":
_, file := path.Split(req.URL.Path)
to = strings.Replace(to, v, file, -1)
case "{dir}":
dir, _ := path.Split(req.URL.Path)
to = path.Clean(strings.Replace(to, v, dir, -1))
}
}
}
// validate resulting path
url, err := url.Parse(to)
if err != nil {
return false
}
// perform rewrite
req.URL.Path = url.Path
if url.RawQuery != "" {
// overwrite query string if present
req.URL.RawQuery = url.RawQuery
}
return true
}
// ServeHTTP implements the middleware.Handler interface and serves requests,
// setting headers on the response according to the configured rules.
func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, rule := range h.Rules {
if middleware.Path(r.URL.Path).Matches(rule.Path) {
for _, header := range rule.Headers {
if strings.HasPrefix(header.Name, "-") {
w.Header().Del(strings.TrimLeft(header.Name, "-"))
} else {
w.Header().Set(header.Name, header.Value)
}
}
}
}
return h.Next.ServeHTTP(w, r)
}
// ServeHTTP converts the HTTP request to a WebSocket connection and serves it up.
func (ws WebSockets) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, sockconfig := range ws.Sockets {
if middleware.Path(r.URL.Path).Matches(sockconfig.Path) {
socket := WebSocket{
Config: sockconfig,
Request: r,
}
websocket.Handler(socket.Handle).ServeHTTP(w, r)
return 0, nil
}
}
// Didn't match a websocket path, so pass-thru
return ws.Next.ServeHTTP(w, r)
}
func (l Logger) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, rule := range l.Rules {
if middleware.Path(r.URL.Path).Matches(rule.PathScope) {
responseRecorder := middleware.NewResponseRecorder(w)
status, err := l.Next.ServeHTTP(responseRecorder, r)
if status >= 400 {
// There was an error up the chain, but no response has been written yet.
// The error must be handled here so the log entry will record the response size.
if l.ErrorFunc != nil {
l.ErrorFunc(responseRecorder, r, status)
} else {
// Default failover error handler
responseRecorder.WriteHeader(status)
fmt.Fprintf(responseRecorder, "%d %s", status, http.StatusText(status))
}
status = 0
}
rep := middleware.NewReplacer(r, responseRecorder, CommonLogEmptyValue)
rule.Log.Println(rep.Replace(rule.Format))
return status, err
}
}
return l.Next.ServeHTTP(w, r)
}
// ShouldCompress checks if the request path matches any of the
// registered paths to ignore. It returns false if an ignored path
// is found and true otherwise.
func (p PathFilter) ShouldCompress(r *http.Request) bool {
return !p.IgnoredPaths.ContainsFunc(func(value string) bool {
return middleware.Path(r.URL.Path).Matches(value)
})
}
// ServeHTTP satisfies the middleware.Handler interface.
func (p Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, upstream := range p.Upstreams {
if middleware.Path(r.URL.Path).Matches(upstream.From()) {
var replacer middleware.Replacer
start := time.Now()
requestHost := r.Host
// Since Select() should give us "up" hosts, keep retrying
// hosts until timeout (or until we get a nil host).
for time.Now().Sub(start) < (60 * time.Second) {
host := upstream.Select()
if host == nil {
return http.StatusBadGateway, errUnreachable
}
proxy := host.ReverseProxy
r.Host = host.Name
if baseURL, err := url.Parse(host.Name); err == nil {
r.Host = baseURL.Host
if proxy == nil {
proxy = NewSingleHostReverseProxy(baseURL, host.WithoutPathPrefix)
}
} else if proxy == nil {
return http.StatusInternalServerError, err
}
var extraHeaders http.Header
if host.ExtraHeaders != nil {
extraHeaders = make(http.Header)
if replacer == nil {
rHost := r.Host
r.Host = requestHost
replacer = middleware.NewReplacer(r, nil, "")
r.Host = rHost
}
for header, values := range host.ExtraHeaders {
for _, value := range values {
extraHeaders.Add(header,
replacer.Replace(value))
if header == "Host" {
r.Host = replacer.Replace(value)
}
}
}
}
atomic.AddInt64(&host.Conns, 1)
backendErr := proxy.ServeHTTP(w, r, extraHeaders)
atomic.AddInt64(&host.Conns, -1)
if backendErr == nil {
return 0, nil
}
timeout := host.FailTimeout
if timeout == 0 {
timeout = 10 * time.Second
}
atomic.AddInt32(&host.Fails, 1)
go func(host *UpstreamHost, timeout time.Duration) {
time.Sleep(timeout)
atomic.AddInt32(&host.Fails, -1)
}(host, timeout)
}
return http.StatusBadGateway, errUnreachable
}
}
return p.Next.ServeHTTP(w, r)
}
// ServeHTTP implements the middleware.Handler interface.
func (b Browse) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
filename := b.Root + r.URL.Path
info, err := os.Stat(filename)
if err != nil {
return b.Next.ServeHTTP(w, r)
}
if !info.IsDir() {
return b.Next.ServeHTTP(w, r)
}
// See if there's a browse configuration to match the path
for _, bc := range b.Configs {
if !middleware.Path(r.URL.Path).Matches(bc.PathScope) {
continue
}
// Browsing navigation gets messed up if browsing a directory
// that doesn't end in "/" (which it should, anyway)
if r.URL.Path[len(r.URL.Path)-1] != '/' {
http.Redirect(w, r, r.URL.Path+"/", http.StatusTemporaryRedirect)
return 0, nil
}
// Load directory contents
file, err := os.Open(b.Root + r.URL.Path)
if err != nil {
if os.IsPermission(err) {
return http.StatusForbidden, err
}
return http.StatusNotFound, err
}
defer file.Close()
files, err := file.Readdir(-1)
if err != nil {
return http.StatusForbidden, err
}
// Determine if user can browse up another folder
var canGoUp bool
curPath := strings.TrimSuffix(r.URL.Path, "/")
for _, other := range b.Configs {
if strings.HasPrefix(path.Dir(curPath), other.PathScope) {
canGoUp = true
break
}
}
// Assemble listing of directory contents
listing, err := directoryListing(files, r, canGoUp, b.Root)
if err != nil { // directory isn't browsable
continue
}
// Get the query vales and store them in the Listing struct
listing.Sort, listing.Order = r.URL.Query().Get("sort"), r.URL.Query().Get("order")
// If the query 'sort' or 'order' is empty, check the cookies
if listing.Sort == "" || listing.Order == "" {
sortCookie, sortErr := r.Cookie("sort")
orderCookie, orderErr := r.Cookie("order")
// if there's no sorting values in the cookies, default to "name" and "asc"
if sortErr != nil || orderErr != nil {
listing.Sort = "name"
listing.Order = "asc"
} else { // if we have values in the cookies, use them
listing.Sort = sortCookie.Value
listing.Order = orderCookie.Value
}
} else { // save the query value of 'sort' and 'order' as cookies
http.SetCookie(w, &http.Cookie{Name: "sort", Value: listing.Sort, Path: "/"})
http.SetCookie(w, &http.Cookie{Name: "order", Value: listing.Order, Path: "/"})
}
// Apply the sorting
listing.applySort()
var buf bytes.Buffer
err = bc.Template.Execute(&buf, listing)
if err != nil {
return http.StatusInternalServerError, err
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
buf.WriteTo(w)
return http.StatusOK, nil
}
// Didn't qualify; pass-thru
return b.Next.ServeHTTP(w, r)
}
// ServeHTTP satisfies the middleware.Handler interface.
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, rule := range h.Rules {
// First requirement: Base path must match
if !middleware.Path(r.URL.Path).Matches(rule.Path) {
continue
}
// In addition to matching the path, a request must meet some
// other criteria before being proxied as FastCGI. For example,
// we probably want to exclude static assets (CSS, JS, images...)
// but we also want to be flexible for the script we proxy to.
fpath := r.URL.Path
if idx, ok := middleware.IndexFile(h.FileSys, fpath, rule.IndexFiles); ok {
fpath = idx
}
// These criteria work well in this order for PHP sites
if fpath[len(fpath)-1] == '/' || strings.HasSuffix(fpath, rule.Ext) || !h.exists(fpath) {
// Create environment for CGI script
env, err := h.buildEnv(r, rule, fpath)
if err != nil {
return http.StatusInternalServerError, err
}
// Connect to FastCGI gateway
var fcgi *FCGIClient
// check if unix socket or tcp
if strings.HasPrefix(rule.Address, "/") || strings.HasPrefix(rule.Address, "unix:") {
if strings.HasPrefix(rule.Address, "unix:") {
rule.Address = rule.Address[len("unix:"):]
}
fcgi, err = Dial("unix", rule.Address)
} else {
fcgi, err = Dial("tcp", rule.Address)
}
if err != nil {
return http.StatusBadGateway, err
}
var resp *http.Response
contentLength, _ := strconv.Atoi(r.Header.Get("Content-Length"))
switch r.Method {
case "HEAD":
resp, err = fcgi.Head(env)
case "GET":
resp, err = fcgi.Get(env)
case "OPTIONS":
resp, err = fcgi.Options(env)
case "POST":
resp, err = fcgi.Post(env, r.Header.Get("Content-Type"), r.Body, contentLength)
case "PUT":
resp, err = fcgi.Put(env, r.Header.Get("Content-Type"), r.Body, contentLength)
case "PATCH":
resp, err = fcgi.Patch(env, r.Header.Get("Content-Type"), r.Body, contentLength)
case "DELETE":
resp, err = fcgi.Delete(env, r.Header.Get("Content-Type"), r.Body, contentLength)
default:
return http.StatusMethodNotAllowed, nil
}
if resp.Body != nil {
defer resp.Body.Close()
}
if err != nil && err != io.EOF {
return http.StatusBadGateway, err
}
// Write the response header
for key, vals := range resp.Header {
for _, val := range vals {
w.Header().Add(key, val)
}
}
w.WriteHeader(resp.StatusCode)
// Write the response body
// TODO: If this has an error, the response will already be
// partly written. We should copy out of resp.Body into a buffer
// first, then write it to the response...
_, err = io.Copy(w, resp.Body)
if err != nil {
return http.StatusBadGateway, err
}
return 0, nil
}
}
return h.Next.ServeHTTP(w, r)
}
// ServeHTTP implements the http.Handler interface.
func (md Markdown) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, cfg := range md.Configs {
if !middleware.Path(r.URL.Path).Matches(cfg.PathScope) {
continue
}
fpath := r.URL.Path
if idx, ok := middleware.IndexFile(md.FileSys, fpath, md.IndexFiles); ok {
fpath = idx
}
for _, ext := range cfg.Extensions {
if strings.HasSuffix(fpath, ext) {
f, err := md.FileSys.Open(fpath)
if err != nil {
if os.IsPermission(err) {
return http.StatusForbidden, err
}
return http.StatusNotFound, nil
}
fs, err := f.Stat()
if err != nil {
return http.StatusNotFound, nil
}
// if development is set, scan directory for file changes for links.
if cfg.Development {
if err := GenerateStatic(md, &cfg); err != nil {
log.Println("On-demand generation error (markdown):", err)
}
}
// if static site is generated, attempt to use it
if filepath, ok := cfg.StaticFiles[fpath]; ok {
if fs1, err := os.Stat(filepath); err == nil {
// if markdown has not been modified since static page
// generation, serve the static page
if fs.ModTime().Before(fs1.ModTime()) {
if html, err := ioutil.ReadFile(filepath); err == nil {
w.Write(html)
return http.StatusOK, nil
}
if os.IsPermission(err) {
return http.StatusForbidden, err
}
return http.StatusNotFound, nil
}
}
}
body, err := ioutil.ReadAll(f)
if err != nil {
return http.StatusInternalServerError, err
}
ctx := middleware.Context{
Root: md.FileSys,
Req: r,
URL: r.URL,
}
html, err := md.Process(cfg, fpath, body, ctx)
if err != nil {
return http.StatusInternalServerError, err
}
w.Write(html)
return http.StatusOK, nil
}
}
}
// Didn't qualify to serve as markdown; pass-thru
return md.Next.ServeHTTP(w, r)
}