cacert-boardvoting/cmd/boardvoting/helpers.go

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/*
Copyright 2017-2022 CAcert Inc.
SPDX-License-Identifier: Apache-2.0
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 main
import (
"bytes"
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"crypto/x509"
"encoding/pem"
"errors"
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"fmt"
"html/template"
"io/fs"
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"net/http"
"path/filepath"
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"runtime/debug"
"strings"
"github.com/Masterminds/sprig/v3"
"github.com/go-playground/form/v4"
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"github.com/julienschmidt/httprouter"
"github.com/justinas/nosurf"
"git.cacert.org/cacert-boardvoting/internal/models"
"git.cacert.org/cacert-boardvoting/ui"
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)
func (app *application) serverError(w http.ResponseWriter, err error) {
trace := fmt.Sprintf("%s\n%s", err.Error(), debug.Stack())
_ = app.errorLog.Output(2, trace)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
func (app *application) clientError(w http.ResponseWriter, status int) {
http.Error(w, http.StatusText(status), status)
}
func (app *application) notFound(w http.ResponseWriter) {
app.clientError(w, http.StatusNotFound)
}
func (app *application) decodePostForm(r *http.Request, dst any) error {
err := r.ParseForm()
if err != nil {
return fmt.Errorf("could not parse HTML form: %w", err)
}
err = app.formDecoder.Decode(dst, r.PostForm)
if err != nil {
var invalidDecoderError *form.InvalidDecoderError
if errors.As(err, &invalidDecoderError) {
panic(err)
}
return fmt.Errorf("could not decode form: %w", err)
}
return nil
}
func newTemplateCache() (map[string]*template.Template, error) {
cache := map[string]*template.Template{}
pages, err := fs.Glob(ui.Files, "html/pages/*.html")
if err != nil {
return nil, fmt.Errorf("could not find page templates: %w", err)
}
funcMaps := sprig.FuncMap()
funcMaps["nl2br"] = func(text string) template.HTML {
// #nosec G203 input is sanitized
return template.HTML(strings.ReplaceAll(template.HTMLEscapeString(text), "\n", "<br>"))
}
funcMaps["canManageUsers"] = func(v *models.User) (bool, error) {
return checkRole(v, models.RoleSecretary, models.RoleAdmin)
}
funcMaps["canVote"] = func(v *models.User) (bool, error) {
return checkRole(v, models.RoleVoter)
}
funcMaps["canStartVote"] = func(v *models.User) (bool, error) {
return checkRole(v, models.RoleVoter)
}
for _, page := range pages {
name := filepath.Base(page)
ts, err := template.New("").Funcs(funcMaps).ParseFS(
ui.Files,
"html/base.html",
"html/partials/*.html",
page,
)
if err != nil {
return nil, fmt.Errorf("could not parse base template: %w", err)
}
cache[name] = ts
}
return cache, nil
}
type templateData struct {
PrevPage string
NextPage string
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Motion *models.Motion
Motions []*models.Motion
User *models.User
Users []*models.User
Request *http.Request
Flash string
Form any
ActiveNav topLevelNavItem
ActiveSubNav subLevelNavItem
CSRFToken string
}
func (app *application) newTemplateData(
r *http.Request,
nav topLevelNavItem,
subNav subLevelNavItem,
) *templateData {
user, _ := app.GetUser(r)
return &templateData{
Request: r,
User: user,
ActiveNav: nav,
ActiveSubNav: subNav,
Flash: app.sessionManager.PopString(r.Context(), "flash"),
CSRFToken: nosurf.Token(r),
}
}
func (app *application) render(w http.ResponseWriter, status int, page string, data *templateData) {
ts, ok := app.templateCache[page]
if !ok {
app.serverError(w, fmt.Errorf("the template %s does not exist", page))
return
}
buf := new(bytes.Buffer)
err := ts.ExecuteTemplate(buf, "base", data)
if err != nil {
app.serverError(w, err)
return
}
w.WriteHeader(status)
_, _ = buf.WriteTo(w)
}
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func (app *application) motionFromRequestParam(
w http.ResponseWriter,
r *http.Request,
params httprouter.Params,
) *models.Motion {
tag := params.ByName("tag")
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withVotes := r.URL.Query().Has("showvotes")
motion, err := app.motions.ByTag(r.Context(), tag, withVotes)
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if err != nil {
app.serverError(w, err)
return nil
}
if motion.ID == 0 {
app.notFound(w)
return nil
}
return motion
}
func (app *application) choiceFromRequestParam(w http.ResponseWriter, params httprouter.Params) *models.VoteChoice {
choiceParam := params.ByName("choice")
choice, err := models.VoteChoiceFromString(choiceParam)
if err != nil {
app.clientError(w, http.StatusBadRequest)
return nil
}
return choice
}
func getPEMClientCert(r *http.Request) (string, error) {
cert := r.Context().Value(ctxAuthenticatedCert)
authenticatedCertificate, ok := cert.(*x509.Certificate)
if !ok {
return "", errors.New("could not handle certificate as x509.Certificate")
}
clientCertPEM := bytes.NewBuffer(make([]byte, 0))
err := pem.Encode(clientCertPEM, &pem.Block{Type: "CERTIFICATE", Bytes: authenticatedCertificate.Raw})
if err != nil {
return "", fmt.Errorf("error encoding client certificate: %w", err)
}
return clientCertPEM.String(), nil
}