// makeClosureHandler returns a handler to serve Closure files.
// root is either:
// 1) empty: use the Closure files compiled in to the binary (if
// available), else redirect to the Internet.
// 2) a URL prefix: base of Camlistore to get Closure to redirect to
// 3) a path on disk to the root of camlistore's source (which
// contains the necessary subset of Closure files)
func makeClosureHandler(root, handlerName string) (http.Handler, error) {
// devcam server environment variable takes precedence:
if d := os.Getenv("CAMLI_DEV_CLOSURE_DIR"); d != "" {
log.Printf("%v: serving Closure from devcam server's $CAMLI_DEV_CLOSURE_DIR: %v", handlerName, d)
return http.FileServer(http.Dir(d)), nil
}
if root == "" {
fs, err := closurestatic.FileSystem()
if err == os.ErrNotExist {
log.Printf("%v: no configured setting or embedded resources; serving Closure via %v", handlerName, closureBaseURL)
return closureBaseURL, nil
}
if err != nil {
return nil, fmt.Errorf("error loading embedded Closure zip file: %v", err)
}
log.Printf("%v: serving Closure from embedded resources", handlerName)
return http.FileServer(fs), nil
}
if strings.HasPrefix(root, "http") {
log.Printf("%v: serving Closure using redirects to %v", handlerName, root)
return closureRedirector(root), nil
}
path := filepath.Join("third_party", "closure", "lib", "closure")
return makeFileServer(root, path, filepath.Join("goog", "base.js"))
}
// makeClosureHandler returns a handler to serve Closure files.
// root is either:
// 1) empty: use the Closure files compiled in to the binary (if
// available), else redirect to the Internet.
// 2) a URL prefix: base of Camlistore to get Closure to redirect to
// 3) a path on disk to the root of camlistore's source (which
// contains the necessary subset of Closure files)
func makeClosureHandler(root, handlerName string) (http.Handler, error) {
// dev-server environment variable takes precendence:
if d := os.Getenv("CAMLI_DEV_CLOSURE_DIR"); d != "" {
log.Printf("%v: serving Closure from dev-server's $CAMLI_DEV_CLOSURE_DIR: %v", handlerName, d)
return http.FileServer(http.Dir(d)), nil
}
if root == "" {
fs, err := closurestatic.FileSystem()
if err == os.ErrNotExist {
log.Printf("%v: no configured setting or embedded resources; serving Closure via %v", handlerName, closureBaseURL)
return closureBaseURL, nil
}
if err != nil {
return nil, fmt.Errorf("error loading embedded Closure zip file: %v", err)
}
log.Printf("%v: serving Closure from embedded resources", handlerName)
return http.FileServer(fs), nil
}
if strings.HasPrefix(root, "http") {
log.Printf("%v: serving Closure using redirects to %v", handlerName, root)
return closureRedirector(root), nil
}
fi, err := os.Stat(root)
if err != nil {
return nil, err
}
if !fi.IsDir() {
return nil, errors.New("not a directory")
}
closureRoot := filepath.Join(root, "third_party", "closure", "lib", "closure")
_, err = os.Stat(filepath.Join(closureRoot, "goog", "base.js"))
if err != nil {
return nil, fmt.Errorf("directory doesn't contain closure/goog/base.js; wrong directory?")
}
log.Printf("%v: serving Closure from disk: %v", handlerName, closureRoot)
return http.FileServer(http.Dir(closureRoot)), nil
}