120 lines
2.9 KiB
Go
120 lines
2.9 KiB
Go
package httpserver
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import (
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"compress/gzip"
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"crypto/rand"
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"encoding/base64"
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"html/template"
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"io"
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"io/fs"
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"mime"
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"net/http"
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"path"
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"path/filepath"
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"strings"
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"time"
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"go.c3c.cz/cv/app/server/internal/files"
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"go.c3c.cz/cv/app/server/internal/version"
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"go.uber.org/zap"
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)
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type handler struct {
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indexTemplate *template.Template
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logger *zap.Logger
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frontendConfig string
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}
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func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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f, err := files.Public.Open(path.Join("data", "public", r.URL.Path))
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if err != nil {
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h.serveIndex(w)
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return
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}
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fi, err := f.Stat()
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if err != nil || fi.IsDir() {
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h.serveIndex(w)
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return
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}
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h.serveFile(w, r, version.CommitTime, f)
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}
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func (h *handler) serveFile(w http.ResponseWriter, r *http.Request, modtime time.Time, f fs.File) {
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if !modtime.IsZero() {
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ims := r.Header.Get("If-Modified-Since")
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modtime = modtime.Truncate(time.Second)
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if t, err := http.ParseTime(ims); err == nil && !modtime.After(t) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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w.Header().Set("Last-Modified", modtime.UTC().Format(http.TimeFormat))
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}
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w.Header().Set("Content-Type", mime.TypeByExtension(filepath.Ext(r.URL.Path)))
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if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
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w.Header().Set("Content-Encoding", "gzip")
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gw, err := gzip.NewWriterLevel(w, gzip.DefaultCompression)
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if err != nil {
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h.logger.Warn("Could not create gzip writer", zap.Error(err))
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return
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}
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if n, _ := io.Copy(gw, f); n == 0 {
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w.Header().Del("Content-Encoding")
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gw.Reset(io.Discard)
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}
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err = gw.Close()
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if err != nil {
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h.logger.Warn("Could not close gzip writer", zap.Error(err))
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return
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}
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} else {
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_, err := io.Copy(w, f)
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if err != nil {
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h.logger.Warn("Could not write file response", zap.Error(err))
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return
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}
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}
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}
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type indexData struct {
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Config string
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CspNonce string
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}
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func (h *handler) serveIndex(w http.ResponseWriter) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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if h.indexTemplate == nil {
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_, _ = w.Write([]byte("no index"))
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return
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}
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token := make([]byte, 12)
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_, err := rand.Read(token)
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if err != nil {
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h.logger.Warn("Could not create random csp token", zap.Error(err))
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return
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}
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data := indexData{
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Config: h.frontendConfig,
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CspNonce: base64.RawStdEncoding.EncodeToString(token),
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}
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w.Header().Set("Content-Security-Policy", "script-src 'self' 'nonce-"+data.CspNonce+"' 'unsafe-eval'")
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w.Header().Set("X-Frame-Options", "DENY")
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w.Header().Set("X-XSS-Protection", "1; mode=block")
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w.Header().Set("X-Content-Type-Options", "nosniff")
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w.Header().Set("Referrer-Policy", "same-origin")
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w.Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
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w.Header().Set("Permissions-Policy", "accelerometer=(), camera=(), geolocation=(), microphone=(), payment=(), usb=()")
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err = h.indexTemplate.Execute(w, data)
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if err != nil {
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h.logger.Warn("Could not execute index template", zap.Error(err))
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}
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}
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