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ShareDAV
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✨ Implemented admin authentication

This commit is contained in:
Andreas Schneider 2020-10-25 12:05:47 +01:00
parent 5034d1a1f8
commit 180ee02582
6 changed files with 308 additions and 88 deletions
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26
templates/base.html
View File

@ -7,17 +7,20 @@
thead {
font-weight: bold;
}
#content {
float: right;
width: 100%;
background-color: #F0F0F0;
}
#menu {
float: left;
width: 200px;
margin-left: -200px;
background-color: #CCCCCC;
}
#menu span {
display: block;
}
@ -29,14 +32,19 @@
{{ block "page-styles" . }}{{ end }}
</head>
<body>
<div id="content">
{{ block "page-content" . }}{{ end }}
</div>
<div id="menu">
<span><a href="./">ShareDAV</a></span>
<span><a href="users">Users</a></span>
<span><a href="shares">Shares</a></span>
</div>
<div style="clear: both;"></div>
<div id="content">
{{ block "page-content" . }}{{ end }}
</div>
<div id="menu">
<span><a href="./">ShareDAV</a></span>
{{ if .SessionUser }}
{{ if eq .SessionUser.Role "admin" }}
<span><a href="users">Users</a></span>
<span><a href="shares">Shares</a></span>
{{ end }}
<span><a href="logout">Logout</a></span>
{{ end }}
</div>
<div style="clear: both;"></div>
</body>
</html>

2
templates/index.html
View File

@ -1,3 +1,3 @@
{{ define "page-content" }}
Test {{.foo}}
Startpage.
{{ end }}

24
templates/login.html Normal file
View File

@ -0,0 +1,24 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ShareDAV Login</title>
</head>
<body>
<div>
<form method="post">
<label>
Username: <input name="username"/>
</label>
<label>
Password: <input type="password" name="password">
</label>
<div>
Beware! You need to have cookies enabled for the login to work.<br/>
The cookie will be used solely for keeping the session alive.
</div>
<input type="submit" value="Login"/>
</form>
</div>
</body>
</html>

2
templates/shares.html
View File

@ -21,7 +21,7 @@
{{ define "page-content" }}
<div id="shares">
{{ range $share := . }}
{{ range $share := .ShareInfos }}
<div id="share-{{$share.UUID}}" class="share">
UUID: {{ $share.UUID }} <form style="display: inline-block;" action="delete-share" method="post">
<input type="hidden" name="share" value="{{ $share.UUID }}"/>

2
templates/users.html
View File

@ -7,7 +7,7 @@
</tr>
</thead>
<tbody>
{{ range $user := .}}<tr>
{{ range $user := .Users }}<tr>
<td>{{ $user.Username }}</td>
<td>{{ $user.Role }}</td>
</tr>{{ end }}

340
webadmin.go
View File

@ -26,19 +26,26 @@
package main
import (
"context"
"fmt"
"html/template"
"log"
"net/http"
"path"
"strings"
"time"
"github.com/go-chi/chi"
uuid "github.com/satori/go.uuid"
"github.com/tidwall/buntdb"
"golang.org/x/crypto/bcrypt"
)
type webAdminHandler struct {
router chi.Router
tplError *template.Template
tplConfirm *template.Template
tplLogin *template.Template
tplIndex *template.Template
tplUsers *template.Template
tplShares *template.Template
@ -46,7 +53,26 @@ type webAdminHandler struct {
tplCreateShare *template.Template
}
type sessionContext struct {
h *webAdminHandler
w http.ResponseWriter
r *http.Request
baseModel map[string]interface{}
}
const sessionCookieName = "sharedavsession"
const sessionLifetime = 1 * time.Hour
const confirmRequested = 0
const confirmAccepted = 1
const confirmDenied = 2
func newWebAdminHandler(app *app) *webAdminHandler {
sessionStore, err := buntdb.Open(":memory:")
if err != nil {
panic("cannot initialize session store: " + err.Error())
}
loadTemplate := func(filename string) *template.Template {
t, err := template.ParseFiles(
path.Join("templates", "base.html"),
@ -57,10 +83,18 @@ func newWebAdminHandler(app *app) *webAdminHandler {
}
return t
}
loadSingleTemplate := func(filename string) *template.Template {
t, err := template.ParseFiles(path.Join("templates", filename+".html"))
if err != nil {
panic(fmt.Sprintf("cannot load template %q: %v", filename, err))
}
return t
}
h := &webAdminHandler{
tplError: loadTemplate("error"),
tplConfirm: loadTemplate("confirm"),
tplLogin: loadSingleTemplate("login"),
tplIndex: loadTemplate("index"),
tplUsers: loadTemplate("users"),
tplShares: loadTemplate("shares"),
@ -68,66 +102,98 @@ func newWebAdminHandler(app *app) *webAdminHandler {
tplCreateShare: loadTemplate("create-share"),
}
renderPage := func(w http.ResponseWriter, tmpl *template.Template, model interface{}) {
if err := tmpl.Execute(w, model); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
renderError := func(w http.ResponseWriter, msg, returnURL string) {
model := struct {
ErrorMessage string
ReturnURL string
}{
ErrorMessage: msg,
ReturnURL: returnURL,
}
renderPage(w, h.tplError, model)
}
const confirmRequested = 0
const confirmAccepted = 1
const confirmDenied = 2
confirm := func(w http.ResponseWriter, r *http.Request, msg template.HTML, returnURL string) int {
if r.FormValue("_yes") != "" {
return confirmAccepted
} else if r.FormValue("_no") != "" {
return confirmDenied
} else {
model := struct {
URL string
Fields map[string]string
Message template.HTML
}{
URL: returnURL,
Fields: make(map[string]string),
Message: msg,
}
for k, v := range r.Form {
model.Fields[k] = v[0]
}
renderPage(w, h.tplConfirm, model)
return confirmRequested
}
}
r := chi.NewRouter()
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
renderPage(w, h.tplIndex, map[string]string{"foo": "bar"})
r.Use(disableCaching)
r.Route("/login", func(r chi.Router) {
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
sessionContext.RenderPage(h.tplLogin, nil)
})
r.Post("/", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
username := r.FormValue("username")
if strings.ContainsAny(username, "*:") {
sessionContext.RenderError("Username or password wrong.", "login")
return
}
user, err := app.userStore.GetUser(username)
if err != nil {
sessionContext.RenderError("Username or password wrong.", "login")
return
}
if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(r.FormValue("password"))); err != nil {
sessionContext.RenderError("Username or password wrong.", "login")
return
}
sessionId := uuid.NewV4()
if err := sessionStore.Update(func(tx *buntdb.Tx) error {
_, _, err := tx.Set(sessionId.String(), user.Username, &buntdb.SetOptions{
Expires: true,
TTL: sessionLifetime,
})
return err
}); err != nil {
log.Printf("error setting session: %v\n", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
cookie := &http.Cookie{
Name: sessionCookieName,
Value: sessionId.String(),
Expires: time.Now().Add(sessionLifetime),
HttpOnly: true,
}
http.SetCookie(w, cookie)
sessionContext.Redirect("./")
})
})
r.Get("/users", func(w http.ResponseWriter, r *http.Request) {
ar := r.With(authenticated(sessionStore, app.userStore))
ar.Get("/logout", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
sessionCookie, err := r.Cookie(sessionCookieName)
if err != nil {
http.Redirect(w, r, "login", http.StatusFound)
return
}
if err := sessionStore.Update(func(tx *buntdb.Tx) error {
_, err := tx.Delete(sessionCookie.Value)
return err
}); err != nil {
log.Printf("error unsetting session: %v\n", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
sessionContext.Redirect("./")
})
ar.Get("/", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
sessionContext.RenderPage(h.tplIndex, nil)
})
ar.Get("/users", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
users, err := app.userStore.GetUsers()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
renderPage(w, h.tplUsers, users)
sessionContext.RenderPage(h.tplUsers, map[string]interface{}{
"Users": users,
})
})
r.Get("/shares", func(w http.ResponseWriter, r *http.Request) {
ar.Get("/shares", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
shares, err := app.shareStore.GetShares()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
@ -150,10 +216,14 @@ func newWebAdminHandler(app *app) *webAdminHandler {
shareInfos[i].Users = users
}
renderPage(w, h.tplShares, shareInfos)
sessionContext.RenderPage(h.tplShares, map[string]interface{}{
"ShareInfos": shareInfos,
})
})
r.Route("/share-add-user", func(r chi.Router) {
ar.Route("/share-add-user", func(r chi.Router) {
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
shareId := r.URL.Query().Get("share")
if shareId == "" {
http.Error(w, "invalid share id", http.StatusBadRequest)
@ -166,67 +236,72 @@ func newWebAdminHandler(app *app) *webAdminHandler {
return
}
model := map[string]interface{}{
sessionContext.RenderPage(h.tplShareAddUser, map[string]interface{}{
"ShareId": shareId,
"Users": users,
}
renderPage(w, h.tplShareAddUser, model)
})
})
r.Post("/", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
returnURL := "share-add-user?share=" + r.FormValue("share")
shareId, err := uuid.FromString(r.FormValue("share"))
if err != nil {
renderError(w, "Internal error: "+err.Error(), "")
sessionContext.RenderError(template.HTML("Internal error: "+err.Error()), "")
return
}
share := Share{UUID: shareId}
user, err := app.userStore.GetUser(r.FormValue("user"))
if err == ErrUserNotFound {
renderError(w, "User not found.", returnURL)
sessionContext.RenderError("User not found.", returnURL)
return
} else if err != nil {
renderError(w, "Internal error: "+err.Error(), "")
sessionContext.RenderError(template.HTML("Internal error: "+err.Error()), "")
return
}
err = app.shareStore.AddUserToShare(share, user.Username, ShareRole(r.FormValue("role")))
if err != nil {
renderError(w, "Cannot add user to share: "+err.Error(), returnURL)
sessionContext.RenderError(template.HTML("Cannot add user to share: "+err.Error()), returnURL)
return
}
http.Redirect(w, r, "shares", http.StatusFound)
sessionContext.Redirect("shares")
})
})
r.Post("/share-delete-user", func(w http.ResponseWriter, r *http.Request) {
ar.Post("/share-delete-user", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
returnURL := "shares"
shareId, err := uuid.FromString(r.FormValue("share"))
if err != nil {
renderError(w, "Internal error: "+err.Error(), "")
sessionContext.RenderError(template.HTML("Internal error: "+err.Error()), "")
return
}
share := Share{UUID: shareId}
err = app.shareStore.RemoveUserFromShare(share, r.FormValue("user"))
if err != nil {
renderError(w, "Cannot remove user from share: "+err.Error(), returnURL)
sessionContext.RenderError(template.HTML("Cannot remove user from share: "+err.Error()), returnURL)
return
}
http.Redirect(w, r, "shares", http.StatusFound)
})
r.Route("/create-share", func(r chi.Router) {
ar.Route("/create-share", func(r chi.Router) {
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
renderPage(w, h.tplCreateShare, nil)
sessionContext := h.buildSessionContext(w, r)
sessionContext.RenderPage(h.tplCreateShare, nil)
})
r.Post("/", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
share, err := app.shareStore.CreateShare()
if err != nil {
renderError(w, "Cannot create share: "+err.Error(), "")
sessionContext.RenderError(template.HTML("Cannot create share: "+err.Error()), "")
return
}
@ -234,39 +309,152 @@ func newWebAdminHandler(app *app) *webAdminHandler {
share.Description = r.FormValue("description")
if err := app.shareStore.UpdateShareAttributes(share); err != nil {
renderError(w, "Cannot update share: "+err.Error(), "")
sessionContext.RenderError(template.HTML("Cannot update share: "+err.Error()), "")
return
}
http.Redirect(w, r, "shares#share-"+share.UUID.String(), http.StatusFound)
sessionContext.Redirect("shares#share-" + share.UUID.String())
})
})
r.Post("/delete-share", func(w http.ResponseWriter, r *http.Request) {
ar.Post("/delete-share", func(w http.ResponseWriter, r *http.Request) {
sessionContext := h.buildSessionContext(w, r)
share, err := app.shareStore.GetShare(r.FormValue("share"))
if err != nil {
renderError(w, "Internal error: "+err.Error(), "")
sessionContext.RenderError(template.HTML("Internal error: "+err.Error()), "")
return
}
message := fmt.Sprintf(`You are about to delete the share %s (%s).<br/>
This will delete all data permanently.<br/><br/>
Are you sure you want to continue?`, share.UUID, share.Name)
if confirmStatus := confirm(w, r, template.HTML(message), "delete-share"); confirmStatus == confirmRequested {
if confirmStatus := sessionContext.RequestConfirmation(template.HTML(message), "delete-share"); confirmStatus == confirmRequested {
// We have already rendered. Nothing to do.
return
} else if confirmStatus == confirmAccepted {
if err := app.shareStore.RemoveShare(share.UUID); err != nil {
renderError(w, "Share cannot be removed: "+err.Error(), "shares")
sessionContext.RenderError(template.HTML("Share cannot be removed: "+err.Error()), "shares")
return
}
}
http.Redirect(w, r, "shares", http.StatusFound)
sessionContext.Redirect("shares")
})
h.router = r
return h
}
func (h webAdminHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
func (h *webAdminHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.router.ServeHTTP(w, r)
}
func (h *webAdminHandler) buildSessionContext(w http.ResponseWriter, r *http.Request) *sessionContext {
sessionContext := &sessionContext{
h: h,
w: w,
r: r,
baseModel: map[string]interface{}{},
}
sessionUser := userFromContext(r)
if sessionUser != nil {
sessionContext.baseModel["SessionUser"] = sessionUser
}
return sessionContext
}
func (s *sessionContext) Redirect(target string) {
http.Redirect(s.w, s.r, target, http.StatusFound)
}
func (s *sessionContext) RenderPage(tmpl *template.Template, model map[string]interface{}) {
effectiveModel := map[string]interface{}{}
for k, v := range s.baseModel {
effectiveModel[k] = v
}
for k, v := range model {
effectiveModel[k] = v
}
if err := tmpl.Execute(s.w, effectiveModel); err != nil {
http.Error(s.w, err.Error(), http.StatusInternalServerError)
}
}
func (s *sessionContext) RenderError(msg template.HTML, returnURL string) {
model := map[string]interface{}{
"ErrorMessage": msg,
"ReturnURL": returnURL,
}
s.RenderPage(s.h.tplError, model)
}
func (s *sessionContext) RequestConfirmation(msg template.HTML, returnURL string) int {
if s.r.FormValue("_yes") != "" {
return confirmAccepted
} else if s.r.FormValue("_no") != "" {
return confirmDenied
} else {
fields := map[string]string{}
for k, v := range s.r.Form {
fields[k] = v[0]
}
model := map[string]interface{}{
"URL": returnURL,
"Message": msg,
"Fields": fields,
}
s.RenderPage(s.h.tplConfirm, model)
return confirmRequested
}
}
func disableCaching(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
w.Header().Set("Pragma", "no-cache")
w.Header().Set("Expires", "0")
next.ServeHTTP(w, r)
})
}
func authenticated(sessionStore *buntdb.DB, userStore UserStore) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
sessionCookie, err := r.Cookie(sessionCookieName)
if err != nil {
http.Redirect(w, r, "login", http.StatusFound)
return
}
var username string
if err := sessionStore.View(func(tx *buntdb.Tx) error {
val, err := tx.Get(sessionCookie.Value)
if err != nil {
return err
}
username = val
return nil
}); err != nil {
http.Redirect(w, r, "login", http.StatusFound)
return
}
user, err := userStore.GetUser(username)
if err != nil {
http.Redirect(w, r, "login", http.StatusFound)
return
}
next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), "user", &user)))
})
}
}
func userFromContext(r *http.Request) *User {
if user, ok := r.Context().Value("user").(*User); ok {
return user
} else {
return nil
}
}