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package main
import (
"crypto/tls"
"errors"
"fmt"
"io"
"mime"
"net/http"
"os"
"path/filepath"
"strconv"
"strings"
)
type domain struct {
Group string
Project string
Config *domainConfig
certificate *tls.Certificate
certificateError error
}
func (d *domain) serveFile(w http.ResponseWriter, r *http.Request, fullPath string) error {
// Open and serve content of file
file, err := os.Open(fullPath)
if err != nil {
return err
}
defer file.Close()
fi, err := file.Stat()
if err != nil {
return err
}
println("Serving", fullPath, "for", r.URL.Path)
http.ServeContent(w, r, filepath.Base(file.Name()), fi.ModTime(), file)
return nil
}
func (d *domain) serveCustomFile(w http.ResponseWriter, r *http.Request, code int, fullPath string) error {
// Open and serve content of file
file, err := os.Open(fullPath)
if err != nil {
return err
}
defer file.Close()
fi, err := file.Stat()
if err != nil {
return err
}
println("Serving", fullPath, "for", r.URL.Path, "with", code)
// Serve the file
_, haveType := w.Header()["Content-Type"]
if !haveType {
ctype := mime.TypeByExtension(filepath.Ext(fullPath))
w.Header().Set("Content-Type", ctype)
}
w.Header().Set("Content-Length", strconv.FormatInt(fi.Size(), 10))
w.WriteHeader(code)
if r.Method != "HEAD" {
io.CopyN(w, file, fi.Size())
}
return nil
}
func (d *domain) resolvePath(projectName string, subPath ...string) (fullPath string, err error) {
publicPath := filepath.Join(d.Group, projectName, "public")
fullPath = filepath.Join(publicPath, filepath.Join(subPath...))
fullPath, err = filepath.EvalSymlinks(fullPath)
if err != nil {
return
}
if !strings.HasPrefix(fullPath, publicPath+"/") && fullPath != publicPath {
err = fmt.Errorf("%q should be in %q", fullPath, publicPath)
return
}
return
}
func (d *domain) tryNotFound(w http.ResponseWriter, r *http.Request, projectName string) error {
page404, err := d.resolvePath(projectName, "404.html")
if err != nil {
return err
}
// Make sure that file is not symlink
fi, err := os.Lstat(page404)
if err != nil && !fi.Mode().IsRegular() {
return err
}
err = d.serveCustomFile(w, r, http.StatusNotFound, page404)
if err != nil {
return err
}
return nil
}
func (d *domain) checkPath(w http.ResponseWriter, r *http.Request, path string) (fullPath string, err error) {
fullPath = path
fi, err := os.Lstat(fullPath)
if err != nil {
return
}
switch {
// If the URL doesn't end with /, send location to client
case fi.IsDir() && !strings.HasSuffix(r.URL.Path, "/"):
newURL := *r.URL
newURL.Path += "/"
http.Redirect(w, r, newURL.String(), 302)
// If this is directory, we try the index.html
case fi.IsDir():
fullPath = filepath.Join(fullPath, "index.html")
fi, err = os.Lstat(fullPath)
if err != nil {
return
}
// We don't allow to open the regular file
case !fi.Mode().IsRegular():
err = fmt.Errorf("%s: is not a regular file", fullPath)
}
return
}
func (d *domain) tryFile(w http.ResponseWriter, r *http.Request, projectName string, subPath ...string) error {
path, err := d.resolvePath(projectName, subPath...)
if err != nil {
return err
}
path, err = d.checkPath(w, r, path)
if err != nil {
return err
}
return d.serveFile(w, r, path)
}
func (d *domain) serveFromGroup(w http.ResponseWriter, r *http.Request) {
// The Path always contains "/" at the beginning
split := strings.SplitN(r.URL.Path, "/", 3)
// Try to serve file for http://group.example.com/subpath/... => /group/subpath/...
if len(split) >= 2 && d.tryFile(w, r, split[1], split[2:]...) == nil {
return
}
// Try to serve file for http://group.example.com/... => /group/group.example.com/...
if r.Host != "" && d.tryFile(w, r, strings.ToLower(r.Host), r.URL.Path) == nil {
return
}
// Try serving not found page for http://group.example.com/subpath/ => /group/subpath/404.html
if len(split) >= 2 && d.tryNotFound(w, r, split[1]) == nil {
return
}
// Try serving not found page for http://group.example.com/ => /group/group.example.com/404.html
if r.Host != "" && d.tryNotFound(w, r, strings.ToLower(r.Host)) == nil {
return
}
// Serve generic not found
serve404(w)
}
func (d *domain) serveFromConfig(w http.ResponseWriter, r *http.Request) {
// Try to serve file for http://host/... => /group/project/...
if d.tryFile(w, r, d.Project, r.URL.Path) == nil {
return
}
// Try serving not found page for http://host/ => /group/project/404.html
if d.tryNotFound(w, r, d.Project) == nil {
return
}
// Serve generic not found
serve404(w)
}
func (d *domain) ensureCertificate() (*tls.Certificate, error) {
if d.Config == nil {
return nil, errors.New("tls certificates can be loaded only for pages with configuration")
}
if d.certificate != nil || d.certificateError != nil {
return d.certificate, d.certificateError
}
tls, err := tls.X509KeyPair([]byte(d.Config.Certificate), []byte(d.Config.Key))
if err != nil {
d.certificateError = err
return nil, err
}
d.certificate = &tls
return d.certificate, nil
}
func (d *domain) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if d.Config != nil {
d.serveFromConfig(w, r)
} else {
d.serveFromGroup(w, r)
}
}
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