/
static.go
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/
static.go
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//go:build !wasm
package app
// Copyright (c) 2018 Bhojpur Consulting Private Limited, India. All rights reserved.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import (
"io/ioutil"
"net/http"
"net/http/httptest"
"os"
"path/filepath"
"strings"
"github.com/bhojpur/web/pkg/app/errors"
)
// GenerateStaticWebsite generates the files to run a PWA built with Bhojpur Web application
// as a static website in the specified directory. Static websites can be used with hosts
// such as Github Pages.
//
// Note that app.wasm must still be built separately and put into the web directory.
func GenerateStaticWebsite(dir string, h *Handler, pages ...string) error {
if dir == "" {
dir = "."
}
resources := map[string]struct{}{
"/": {},
"/wasm_exec.js": {},
"/app.js": {},
"/app-worker.js": {},
"/manifest.webmanifest": {},
"/app.css": {},
"/web": {},
}
for path := range routes.routes {
resources[path] = struct{}{}
}
for _, p := range pages {
if p == "" {
continue
}
if !strings.HasPrefix(p, "/") {
p = "/" + p
}
resources[p] = struct{}{}
}
server := httptest.NewServer(h)
defer server.Close()
for path := range resources {
switch path {
case "/web":
if err := createStaticDir(filepath.Join(dir, path), ""); err != nil {
return errors.New("creating web directory failed").Wrap(err)
}
default:
filename := path
if filename == "/" {
filename = "/index.html"
}
f, err := createStaticFile(dir, filename)
if err != nil {
return errors.New("creating file failed").
Tag("path", path).
Tag("filename", filename).
Wrap(err)
}
defer f.Close()
page, err := createStaticPage(server.URL + path)
if err != nil {
return errors.New("creating page failed").
Tag("path", path).
Tag("filename", filename).
Wrap(err)
}
if n, err := f.Write(page); err != nil {
return errors.New("writing page failed").
Tag("path", path).
Tag("filename", filename).
Tag("bytes-written", n).
Wrap(err)
}
}
}
return nil
}
func createStaticDir(dir, path string) error {
dir = filepath.Join(dir, filepath.Dir(path))
if _, err := os.Stat(dir); !os.IsNotExist(err) {
return nil
}
return os.MkdirAll(filepath.Join(dir), 0755)
}
func createStaticFile(dir, path string) (*os.File, error) {
if err := createStaticDir(dir, path); err != nil {
return nil, errors.New("creating file directory failed").Wrap(err)
}
filename := filepath.Join(dir, path)
if filepath.Ext(filename) == "" {
filename += ".html"
}
return os.Create(filename)
}
func createStaticPage(path string) ([]byte, error) {
req, err := http.NewRequest(http.MethodGet, path, nil)
if err != nil {
return nil, errors.New("creating http request failed").
Tag("path", path).
Wrap(err)
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, errors.New("http request failed").
Tag("path", path).
Wrap(err)
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, errors.New("reading request body failed").
Tag("path", path).
Wrap(err)
}
return body, nil
}