Function serveStaticData

application/controller/static.go:85–154

(
	dataName string,
	w http.ResponseWriter,
	r *http.Request,
	l log.Logger,
)

}

func serveStaticData(
	dataName string,
	w http.ResponseWriter,
	r *http.Request,
	l log.Logger,
) error {
	if strings.ToUpper(r.Method) != "GET" {
		return ErrControllerNotImplemented
	}

	fileExt := staticFileExt(dataName)

	if fileExt == ".html" || fileExt == ".htm" {
		return ErrNotFound
	}

	d, dFound := staticPages[dataName]

	if !dFound {
		return ErrNotFound
	}

	selectedData := d.data
	selectedDataHash := d.dataHash
	compressEnabled := false

	if clientSupportGZIP(r) && d.hasCompressed() {
		selectedData = d.compressd
		selectedDataHash = d.compressdHash

		compressEnabled = true

		w.Header().Add("Vary", "Accept-Encoding")
	}

	canUseCache := true

	if !clientContentEtagIsValid(r, selectedDataHash) {
		canUseCache = false
	}

	if clientContentModifiedSince(r, d.created) {
		canUseCache = false
	}

	if canUseCache {
		w.WriteHeader(http.StatusNotModified)

		return nil
	}

	w.Header().Add("Cache-Control", "public, max-age=31536000")
	w.Header().Add("ETag", "\""+selectedDataHash+"\"")

	mimeType := mime.TypeByExtension(fileExt)

	if len(mimeType) > 0 {
		w.Header().Add("Content-Type", mimeType)