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handle_http_static.go
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/
handle_http_static.go
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// Copyright 2022 Paul Greenberg greenpau@outlook.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package authn
import (
"context"
"github.com/datamixio/lib-go-authcrunch/pkg/authn/ui"
"github.com/datamixio/lib-go-authcrunch/pkg/requests"
"io"
"net/http"
"path"
"strings"
)
func (p *Portal) handleHTTPStaticAssets(ctx context.Context, w http.ResponseWriter, r *http.Request, rr *requests.Request) error {
var assetPath string
switch {
case strings.Contains(r.URL.Path, "/favicon"):
assetPath = "assets/images/" + path.Base(r.URL.Path)
default:
i := strings.Index(r.URL.Path, "/assets/")
assetPath = r.URL.Path[i+1:]
}
p.logRequest("static assets", r, rr)
asset, err := ui.StaticAssets.GetAsset(assetPath)
if err != nil {
return p.handleHTTPError(ctx, w, r, rr, http.StatusNotFound)
}
if asset.Restricted && !rr.Response.Authenticated {
// If an asset is a protected asset and a user is not authorized,
// then deny access to the asset.
return p.handleHTTPError(ctx, w, r, rr, http.StatusUnauthorized)
}
w.Header().Set("Content-Type", asset.ContentType)
w.Header().Set("Etag", asset.Checksum)
w.Header().Set("Cache-Control", "max-age=7200")
if match := r.Header.Get("If-None-Match"); match != "" {
if strings.Contains(match, asset.Checksum) {
w.WriteHeader(http.StatusNotModified)
return nil
}
}
// TODO(greenpau): add compressed output, e.g. bzip.
w.WriteHeader(http.StatusOK)
io.WriteString(w, asset.Content)
return nil
}