// 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)
}