From d7233de6883fbb83cf445b19cdc95a119caa52b8 Mon Sep 17 00:00:00 2001
From: Kamil Trzcinski <ayufan@ayufan.eu>
Date: Tue, 23 Feb 2016 12:40:41 +0100
Subject: Added support for serving the 404 page

---
 domain.go | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 85 insertions(+), 19 deletions(-)

diff --git a/domain.go b/domain.go
index 32a8b09c..49df3762 100644
--- a/domain.go
+++ b/domain.go
@@ -4,9 +4,12 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
+	"io"
+	"mime"
 	"net/http"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
 )
 
@@ -18,29 +21,54 @@ type domain struct {
 	certificateError error
 }
 
-func (d *domain) notFound(w http.ResponseWriter, r *http.Request) {
-	http.NotFound(w, r)
-}
-
-func (d *domain) serveFile(w http.ResponseWriter, r *http.Request, fullPath string) bool {
+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 false
+		return err
 	}
 	defer file.Close()
 
 	fi, err := file.Stat()
 	if err != nil {
-		return false
+		return err
 	}
 
 	println("Serving", fullPath, "for", r.URL.Path)
 	http.ServeContent(w, r, filepath.Base(file.Name()), fi.ModTime(), file)
-	return true
+	return nil
 }
 
-func (d *domain) resolvePath(w http.ResponseWriter, r *http.Request, projectName, subPath string) (fullPath string, err error) {
+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, subPath string) (fullPath string, err error) {
 	publicPath := filepath.Join(d.Group, projectName, "public")
 
 	fullPath = filepath.Join(publicPath, subPath)
@@ -56,6 +84,25 @@ func (d *domain) resolvePath(w http.ResponseWriter, r *http.Request, projectName
 	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)
@@ -85,45 +132,64 @@ func (d *domain) checkPath(w http.ResponseWriter, r *http.Request, path string)
 	return
 }
 
-func (d *domain) tryFile(w http.ResponseWriter, r *http.Request, projectName, subPath string) bool {
-	path, err := d.resolvePath(w, r, projectName, subPath)
+func (d *domain) tryFile(w http.ResponseWriter, r *http.Request, projectName, subPath string) error {
+	path, err := d.resolvePath(projectName, subPath)
 	if err != nil {
-		return false
+		return err
 	}
 	path, err = d.checkPath(w, r, path)
 	if err != nil {
-		return false
+		return err
 	}
 	return d.serveFile(w, r, path)
 }
 
 func (d *domain) serveFromGroup(w http.ResponseWriter, r *http.Request) {
-	// The Path always contains "/" at the beggining
+	// 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 {
 		subPath := ""
 		if len(split) >= 3 {
 			subPath = split[2]
 		}
-		if d.tryFile(w, r, split[1], subPath) {
+		if d.tryFile(w, r, split[1], subPath) == nil {
 			return
 		}
 	}
 
-	if r.Host != "" && d.tryFile(w, r, strings.ToLower(r.Host), r.URL.Path) {
+	// 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
 	}
 
-	d.notFound(w, r)
+	// 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.tryFile(w, r, strings.ToLower(r.Host), r.URL.Path) == nil {
+		return
+	}
+
+	// Serve generic not found
+	http.NotFound(w, r)
 }
 
 func (d *domain) serveFromConfig(w http.ResponseWriter, r *http.Request) {
-	if d.tryFile(w, r, d.Project, r.URL.Path) {
+	// Try to serve file for http://host/... => /group/project/...
+	if d.tryFile(w, r, d.Project, r.URL.Path) == nil {
 		return
 	}
 
-	d.notFound(w, r)
+	// Try serving not found page for http://host/ => /group/project/404.html
+	if d.tryNotFound(w, r, d.Project) == nil {
+		return
+	}
+
+	http.NotFound(w, r)
 }
 
 func (d *domain) ensureCertificate() (*tls.Certificate, error) {
-- 
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