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gotogether.go
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gotogether.go
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package gotogether
import (
"archive/zip"
"fmt"
"html/template"
"io"
"io/ioutil"
"mime"
"net/http"
"os"
"path/filepath"
"strings"
"sync"
"time"
)
const (
Version = "0.3.2"
)
var ResourceMap map[string]Resource = nil
var initMutex sync.Mutex
func loadMap() (map[string]Resource, error) {
this := os.Args[0]
file, err := os.Open(this)
if err != nil {
return nil, err
}
info, err := file.Stat()
if err != nil {
return nil, err
}
rdr, err := zip.NewReader(file, info.Size())
if err != nil {
return nil, err
}
entries := make(map[string]Resource)
for _, file := range rdr.File {
if file.FileInfo().IsDir() {
continue
}
entries[file.Name] = &resource{file}
}
return entries, nil
}
func Initialize() error {
initMutex.Lock()
defer initMutex.Unlock()
if ResourceMap != nil {
return nil
}
var err error
ResourceMap, err = loadMap()
return err
}
type Resource interface {
Name() string
Open() (io.ReadCloser, error)
Size() int64
ModTime() time.Time
}
type resource struct {
entry *zip.File
}
func (rsc *resource) Name() string {
return rsc.entry.Name
}
func (rsc *resource) Open() (io.ReadCloser, error) {
return rsc.entry.Open()
}
func (rsc *resource) Size() int64 {
return rsc.entry.FileInfo().Size()
}
func (rsc *resource) ModTime() time.Time {
return rsc.entry.FileInfo().ModTime()
}
type handler int
func (h handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
rsc := Get(req.URL.Path)
if rsc == nil {
http.NotFound(w, req)
return
}
rdr, err := rsc.Open()
if err != nil {
message := fmt.Sprintf("can't open %s - %s", rsc.Name(), err)
http.Error(w, message, http.StatusInternalServerError)
}
defer rdr.Close()
mtype := mime.TypeByExtension(filepath.Ext(req.URL.Path))
if len(mtype) != 0 {
w.Header().Set("Content-Type", mtype)
}
w.Header().Set("Content-Size", fmt.Sprintf("%d", rsc.Size()))
w.Header().Set("Last-Modified", rsc.ModTime().UTC().Format(http.TimeFormat))
//Set a 1-year expiration time. These ARE static resources, right?
w.Header().Set("Cache-Control", fmt.Sprintf("public, max-age=%d", 31536000))
io.Copy(w, rdr)
}
// Get returns the named resource (nil if not found)
func Get(path string) Resource {
return ResourceMap[path]
}
// Handle register HTTP handler under prefix
func Handle(prefix string) error {
if err := Initialize(); err != nil {
return err
}
if !strings.HasSuffix(prefix, "/") {
prefix += "/"
}
var h handler
http.Handle(prefix, http.StripPrefix("/", h))
return nil
}
// LoadTemplates loads named templates from resources.
// If the argument "t" is nil, it is created from the first resource.
func LoadTemplates(t *template.Template, filenames ...string) (*template.Template, error) {
if err := Initialize(); err != nil {
return nil, err
}
if len(filenames) == 0 {
// Not really a problem, but be consistent.
return nil, fmt.Errorf("no files named in call to LoadTemplates")
}
for _, filename := range filenames {
rsc := Get(filename)
if rsc == nil {
return nil, fmt.Errorf("can't find %s", filename)
}
rdr, err := rsc.Open()
if err != nil {
return nil, fmt.Errorf("can't open %s - %s", filename, err)
}
data, err := ioutil.ReadAll(rdr)
if err != nil {
return nil, err
}
var tmpl *template.Template
name := filepath.Base(filename)
if t == nil {
t = template.New(name)
}
if name == t.Name() {
tmpl = t
} else {
tmpl = t.New(name)
}
_, err = tmpl.Parse(string(data))
if err != nil {
return nil, err
}
}
return t, nil
}