115 lines
2.6 KiB
Go
115 lines
2.6 KiB
Go
// SPDX-FileCopyrightText: 2021 The NGI Pointer Secure-Scuttlebutt Team of 2020/2021
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//
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// SPDX-License-Identifier: MIT
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package errors
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import (
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"encoding/gob"
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"fmt"
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"html/template"
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"net/http"
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"github.com/gorilla/sessions"
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"github.com/ssbc/go-ssb-room/v2/web/i18n"
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)
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type FlashHelper struct {
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store sessions.Store
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locHelper *i18n.Helper
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}
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func NewFlashHelper(s sessions.Store, loc *i18n.Helper) *FlashHelper {
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gob.Register(FlashMessage{})
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return &FlashHelper{
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store: s,
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locHelper: loc,
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}
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}
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const flashSession = "go-ssb-room-flash-messages"
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type FlashKind uint
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const (
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_ FlashKind = iota
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// FlashError signals that a problem occured
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FlashError
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// FlashNotification represents a normal message (like "xyz added/updated successfull")
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FlashNotification
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)
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type FlashMessage struct {
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Kind FlashKind
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Message template.HTML
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}
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// TODO: rethink error return - maybe panic() / maybe render package?
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// AddMessage expects a i18n label, translates it and adds it as a FlashNotification
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func (fh FlashHelper) AddMessage(rw http.ResponseWriter, req *http.Request, label string) {
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session, err := fh.store.Get(req, flashSession)
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if err != nil {
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panic(fmt.Errorf("flashHelper: failed to get session: %w", err))
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}
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ih := fh.locHelper.FromRequest(req)
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session.AddFlash(FlashMessage{
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Kind: FlashNotification,
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Message: ih.LocalizeSimple(label),
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})
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if err := session.Save(req, rw); err != nil {
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panic(fmt.Errorf("flashHelper: failed to save session: %w", err))
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}
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}
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// AddError adds a FlashError and translates the passed err using localizeError()
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func (fh FlashHelper) AddError(rw http.ResponseWriter, req *http.Request, err error) {
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session, getErr := fh.store.Get(req, flashSession)
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if getErr != nil {
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panic(fmt.Errorf("flashHelper: failed to get session: %w", err))
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}
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ih := fh.locHelper.FromRequest(req)
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_, msg := localizeError(ih, err)
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session.AddFlash(FlashMessage{
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Kind: FlashError,
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Message: msg,
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})
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if err := session.Save(req, rw); err != nil {
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panic(fmt.Errorf("flashHelper: failed to save session: %w", err))
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}
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}
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// GetAll returns all the FlashMessages, emptys and updates the store
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func (fh FlashHelper) GetAll(rw http.ResponseWriter, req *http.Request) ([]FlashMessage, error) {
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session, err := fh.store.Get(req, flashSession)
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if err != nil {
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return nil, err
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}
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opaqueFlashes := session.Flashes()
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flashes := make([]FlashMessage, len(opaqueFlashes))
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for i, of := range opaqueFlashes {
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f, ok := of.(FlashMessage)
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if !ok {
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return nil, fmt.Errorf("GetFlashes: failed to unpack flash: %T", of)
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}
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flashes[i].Kind = f.Kind
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flashes[i].Message = f.Message
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}
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err = session.Save(req, rw)
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return flashes, err
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}
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