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package psr7
import (
"github.com/spiral/roadrunner"
"net/http"
"strings"
"path"
"github.com/sirupsen/logrus"
"os"
"path/filepath"
"encoding/json"
)
var (
excludeFiles = []string{".php", ".htaccess"}
)
// Configures http rr
type Config struct {
// ServeStatic enables static file serving from desired root directory.
ServeStatic bool
// Root directory, required when ServeStatic set to true.
Root string
}
// Server serves http connections to underlying PHP application using PSR-7 protocol. Context will include request headers,
// parsed files and query, payload will include parsed form data (if any) - todo: do we need to do that?.
type Server struct {
cfg Config
root http.Dir
rr *roadrunner.Server
}
// NewServer returns new instance of Server PSR7 server.
func NewServer(cfg Config, server *roadrunner.Server) *Server {
h := &Server{cfg: cfg, rr: server}
if cfg.ServeStatic {
h.root = http.Dir(h.cfg.Root)
}
return h
}
// ServeHTTP serve using PSR-7 requests passed to underlying application.
func (svr *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) () {
if svr.cfg.ServeStatic && svr.serveStatic(w, r) {
// server always attempt to serve static files first
return
}
req, err := ParseRequest(r)
if err != nil {
w.WriteHeader(500)
w.Write([]byte(err.Error())) //todo: better errors
return
}
defer req.Close()
rsp, err := svr.rr.Exec(req.Payload())
if err != nil {
w.WriteHeader(500)
w.Write([]byte(err.Error())) //todo: better errors
return
}
resp := &Response{}
if err = json.Unmarshal(rsp.Context, resp); err != nil {
w.WriteHeader(500)
w.Write([]byte(err.Error())) //todo: better errors
return
}
resp.Write(w)
w.Write(rsp.Body)
}
// serveStatic attempts to serve static file and returns true in case of success, will return false in case if file not
// found, not allowed or on read error.
func (svr *Server) serveStatic(w http.ResponseWriter, r *http.Request) bool {
fpath := r.URL.Path
if !strings.HasPrefix(fpath, "/") {
fpath = "/" + fpath
}
fpath = path.Clean(fpath)
if svr.excluded(fpath) {
logrus.Warningf("attempt to access forbidden file %s", fpath)
return false
}
f, err := svr.root.Open(fpath)
if err != nil {
if !os.IsNotExist(err) {
// rr or access error
logrus.Error(err)
}
return false
}
defer f.Close()
d, err := f.Stat()
if err != nil {
// rr error
logrus.Error(err)
return false
}
if d.IsDir() {
// we are not serving directories
return false
}
http.ServeContent(w, r, d.Name(), d.ModTime(), f)
return true
}
// excluded returns true if file has forbidden extension.
func (svr *Server) excluded(path string) bool {
ext := strings.ToLower(filepath.Ext(path))
for _, exl := range excludeFiles {
if ext == exl {
return true
}
}
return false
}
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