github.com/greenpau/go-authcrunch@v1.1.4/pkg/authn/handle_http_static.go (about)

     1  // Copyright 2022 Paul Greenberg greenpau@outlook.com
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package authn
    16  
    17  import (
    18  	"context"
    19  	"github.com/greenpau/go-authcrunch/pkg/authn/ui"
    20  	"github.com/greenpau/go-authcrunch/pkg/requests"
    21  	"io"
    22  	"net/http"
    23  	"path"
    24  	"strings"
    25  )
    26  
    27  func (p *Portal) handleHTTPStaticAssets(ctx context.Context, w http.ResponseWriter, r *http.Request, rr *requests.Request) error {
    28  	var assetPath string
    29  	switch {
    30  	case strings.Contains(r.URL.Path, "/favicon"):
    31  		assetPath = "assets/images/" + path.Base(r.URL.Path)
    32  	default:
    33  		i := strings.Index(r.URL.Path, "/assets/")
    34  		assetPath = r.URL.Path[i+1:]
    35  	}
    36  
    37  	p.logRequest("static assets", r, rr)
    38  	asset, err := ui.StaticAssets.GetAsset(assetPath)
    39  	if err != nil {
    40  		return p.handleHTTPError(ctx, w, r, rr, http.StatusNotFound)
    41  	}
    42  
    43  	if asset.Restricted && !rr.Response.Authenticated {
    44  		// If an asset is a protected asset and a user is not authorized,
    45  		// then deny access to the asset.
    46  		return p.handleHTTPError(ctx, w, r, rr, http.StatusUnauthorized)
    47  	}
    48  
    49  	w.Header().Set("Content-Type", asset.ContentType)
    50  	w.Header().Set("Etag", asset.Checksum)
    51  	w.Header().Set("Cache-Control", "max-age=7200")
    52  	if match := r.Header.Get("If-None-Match"); match != "" {
    53  		if strings.Contains(match, asset.Checksum) {
    54  			w.WriteHeader(http.StatusNotModified)
    55  			return nil
    56  		}
    57  	}
    58  	// TODO(greenpau): add compressed output, e.g. bzip.
    59  	w.WriteHeader(http.StatusOK)
    60  	io.WriteString(w, asset.Content)
    61  	return nil
    62  }