internal/website/mux.go (view raw)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | package website
import (
"encoding/json"
"net/http"
"strings"
"website/internal/config"
ihttp "website/internal/http"
"website/internal/log"
"website/templates"
"github.com/benpate/digit"
"github.com/kevinpollet/nego"
"github.com/pkg/errors"
)
func CanonicalisePath(path string) (cPath string, differs bool) {
cPath = path
if strings.HasSuffix(path, "/index.html") {
cPath, differs = strings.CutSuffix(path, "index.html")
} else if !strings.HasSuffix(path, "/") && files[path+"/"] != nil {
cPath, differs = path+"/", true
}
return cPath, differs
}
type webHandler func(http.ResponseWriter, *http.Request) *ihttp.Error
type WrappedWebHandler struct {
config *config.Config
handler webHandler
}
func wrapHandler(cfg *config.Config, webHandler webHandler) WrappedWebHandler {
return WrappedWebHandler{
config: cfg,
handler: webHandler,
}
}
func (fn WrappedWebHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer func() {
if fail := recover(); fail != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Error("runtime panic!", "error", fail)
}
}()
if err := fn.handler(w, r); err != nil {
if strings.Contains(r.Header.Get("Accept"), "text/html") {
w.WriteHeader(err.Code)
err := templates.Error(fn.config, r.URL.Path, err).Render(r.Context(), w)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
} else {
http.Error(w, err.Message, err.Code)
}
}
}
func NewMux(cfg *config.Config, root string) (mux *http.ServeMux, err error) {
mux = &http.ServeMux{}
log.Debug("registering content files", "root", root)
err = registerContentFiles(root)
if err != nil {
return nil, errors.WithMessagef(err, "registering content files")
}
templates.Setup()
mux.Handle("/", wrapHandler(cfg, func(w http.ResponseWriter, r *http.Request) *ihttp.Error {
urlPath, shouldRedirect := CanonicalisePath(r.URL.Path)
if shouldRedirect {
http.Redirect(w, r, urlPath, 302)
return nil
}
file := GetFile(urlPath)
if file == nil {
return &ihttp.Error{
Message: "File not found",
Code: http.StatusNotFound,
}
}
w.Header().Add("ETag", file.etag)
w.Header().Add("Vary", "Accept-Encoding")
w.Header().Add("Content-Security-Policy", cfg.CSP.String())
for k, v := range cfg.Extra.Headers {
w.Header().Add(k, v)
}
enc := nego.NegotiateContentEncoding(r, file.AvailableEncodings()...)
switch enc {
case "br", "gzip":
w.Header().Add("Content-Encoding", enc)
w.Header().Add("Content-Type", file.contentType)
}
http.ServeFile(w, r, files[urlPath].alternatives[enc])
return nil
}))
var acctResource = "acct:" + cfg.Email
me := digit.NewResource(acctResource).
Link("http://openid.net/specs/connect/1.0/issuer", "", cfg.OIDCHost.String())
mux.HandleFunc("/.well-known/webfinger", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Query().Get("resource") == acctResource {
obj, err := json.Marshal(me)
if err != nil {
http.Error(
w,
http.StatusText(http.StatusInternalServerError),
http.StatusInternalServerError,
)
return
}
w.Header().Add("Content-Type", "application/jrd+json")
w.Header().Add("Access-Control-Allow-Origin", "*")
_, err = w.Write(obj)
if err != nil {
log.Warn("error writing webfinger request", "error", err)
}
}
})
const oidcPath = "/.well-known/openid-configuration"
mux.HandleFunc(
oidcPath,
func(w http.ResponseWriter, r *http.Request) {
u := cfg.OIDCHost.JoinPath(oidcPath)
http.Redirect(w, r, u.String(), 302)
})
return mux, nil
}
|