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handler.go
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handler.go
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package web
import (
"bytes"
"net/http"
"net/http/httputil"
"net/url"
"os"
"path"
"strings"
"time"
"github.com/pkg/errors"
)
// NewHandler creates a new http.Handler that will serve UI files
// using bundled assets or by proxying to urlStr if set.
func NewHandler(urlStr string) (http.Handler, error) {
if urlStr == "" {
return newMemoryHandler(), nil
}
u, err := url.Parse(urlStr)
if err != nil {
return nil, errors.Wrap(err, "parse url")
}
return httputil.NewSingleHostReverseProxy(u), nil
}
type memoryHandler map[string]File
type memoryFile struct {
*bytes.Reader
file File
}
func (m memoryHandler) Open(file string) (http.File, error) {
if f, ok := m["src/build"+file]; ok {
return &memoryFile{Reader: bytes.NewReader(f.Data()), file: f}, nil
}
f, ok := m["src/build/index.html"]
if !ok {
return nil, errors.New("not found")
}
return &memoryFile{Reader: bytes.NewReader(f.Data()), file: f}, nil
}
func (m *memoryFile) Close() error { return nil }
func (m *memoryFile) Readdir(int) ([]os.FileInfo, error) {
return nil, errors.New("not a directory")
}
func (m *memoryFile) Stat() (os.FileInfo, error) {
return m, nil
}
func (m *memoryFile) Name() string { return path.Base(m.file.Name) }
func (m *memoryFile) Size() int64 { return int64(len(m.file.Data())) }
func (m *memoryFile) Mode() os.FileMode { return 0644 }
func (m *memoryFile) ModTime() time.Time {
if strings.Contains(m.file.Name, "/static/") {
return time.Time{}
}
return time.Now()
}
func (m *memoryFile) IsDir() bool { return false }
func (m *memoryFile) Sys() interface{} { return nil }
func rootFSFix(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if req.URL.Path == "/" {
// necessary to avoid redirect loop
req.URL.Path = "/alerts"
}
if strings.Contains(req.URL.Path, "/static/") {
w.Header().Add("Cache-Control", "public, immutable, max-age=315360000")
}
h.ServeHTTP(w, req)
})
}
func newMemoryHandler() http.Handler {
if len(Files) > 0 {
// preload
go Files[0].Data()
}
m := make(memoryHandler, len(Files))
for _, f := range Files {
m[f.Name] = f
}
return rootFSFix(http.FileServer(m))
}