alps/plugins/base/routes.go
2020-05-20 15:28:36 +02:00

908 lines
24 KiB
Go

package alpsbase
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"mime"
"net/http"
"net/url"
"strconv"
"strings"
"git.sr.ht/~emersion/alps"
"github.com/emersion/go-imap"
imapmove "github.com/emersion/go-imap-move"
imapclient "github.com/emersion/go-imap/client"
"github.com/emersion/go-message"
"github.com/emersion/go-message/mail"
"github.com/emersion/go-smtp"
"github.com/labstack/echo/v4"
)
func registerRoutes(p *alps.GoPlugin) {
p.GET("/", func(ctx *alps.Context) error {
return ctx.Redirect(http.StatusFound, "/mailbox/INBOX")
})
p.GET("/mailbox/:mbox", handleGetMailbox)
p.POST("/mailbox/:mbox", handleGetMailbox)
p.GET("/message/:mbox/:uid", func(ctx *alps.Context) error {
return handleGetPart(ctx, false)
})
p.GET("/message/:mbox/:uid/raw", func(ctx *alps.Context) error {
return handleGetPart(ctx, true)
})
p.GET("/login", handleLogin)
p.POST("/login", handleLogin)
p.GET("/logout", handleLogout)
p.GET("/compose", handleComposeNew)
p.POST("/compose", handleComposeNew)
p.GET("/message/:mbox/:uid/reply", handleReply)
p.POST("/message/:mbox/:uid/reply", handleReply)
p.GET("/message/:mbox/:uid/forward", handleForward)
p.POST("/message/:mbox/:uid/forward", handleForward)
p.GET("/message/:mbox/:uid/edit", handleEdit)
p.POST("/message/:mbox/:uid/edit", handleEdit)
p.POST("/message/:mbox/move", handleMove)
p.POST("/message/:mbox/delete", handleDelete)
p.POST("/message/:mbox/flag", handleSetFlags)
p.GET("/settings", handleSettings)
p.POST("/settings", handleSettings)
}
type MailboxRenderData struct {
alps.BaseRenderData
Mailbox *MailboxStatus
Mailboxes []MailboxInfo
Messages []IMAPMessage
PrevPage, NextPage int
Query string
}
func handleGetMailbox(ctx *alps.Context) error {
mboxName, err := url.PathUnescape(ctx.Param("mbox"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
page := 0
if pageStr := ctx.QueryParam("page"); pageStr != "" {
var err error
if page, err = strconv.Atoi(pageStr); err != nil || page < 0 {
return echo.NewHTTPError(http.StatusBadRequest, "invalid page index")
}
}
settings, err := loadSettings(ctx.Session.Store())
if err != nil {
return err
}
messagesPerPage := settings.MessagesPerPage
query := ctx.QueryParam("query")
var mailboxes []MailboxInfo
var msgs []IMAPMessage
var mbox *MailboxStatus
var total int
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
var err error
if mailboxes, err = listMailboxes(c); err != nil {
return err
}
if query != "" {
msgs, total, err = searchMessages(c, mboxName, query, page, messagesPerPage)
} else {
msgs, err = listMessages(c, mboxName, page, messagesPerPage)
}
if err != nil {
return err
}
if mbox, err = getMailboxStatus(c, mboxName); err != nil {
return err
}
return nil
})
if err != nil {
return err
}
prevPage, nextPage := -1, -1
if query != "" {
if page > 0 {
prevPage = page - 1
}
if (page+1)*messagesPerPage <= total {
nextPage = page + 1
}
} else {
if page > 0 {
prevPage = page - 1
}
if (page+1)*messagesPerPage < int(mbox.Messages) {
nextPage = page + 1
}
}
title := mbox.Name
if title == "INBOX" {
title = "Inbox"
}
if mbox.Unseen > 0 {
title = fmt.Sprintf("(%d) %s", mbox.Unseen, title)
}
return ctx.Render(http.StatusOK, "mailbox.html", &MailboxRenderData{
BaseRenderData: *alps.NewBaseRenderData(ctx).WithTitle(title),
Mailbox: mbox,
Mailboxes: mailboxes,
Messages: msgs,
PrevPage: prevPage,
NextPage: nextPage,
Query: query,
})
}
func handleLogin(ctx *alps.Context) error {
username := ctx.FormValue("username")
password := ctx.FormValue("password")
if username != "" && password != "" {
s, err := ctx.Server.Sessions.Put(username, password)
if err != nil {
if _, ok := err.(alps.AuthError); ok {
return ctx.Render(http.StatusOK, "login.html", nil)
}
return fmt.Errorf("failed to put connection in pool: %v", err)
}
ctx.SetSession(s)
if path := ctx.QueryParam("next"); path != "" && path[0] == '/' && path != "/login" {
return ctx.Redirect(http.StatusFound, path)
}
return ctx.Redirect(http.StatusFound, "/mailbox/INBOX")
}
return ctx.Render(http.StatusOK, "login.html", alps.NewBaseRenderData(ctx))
}
func handleLogout(ctx *alps.Context) error {
ctx.Session.Close()
ctx.SetSession(nil)
return ctx.Redirect(http.StatusFound, "/login")
}
type MessageRenderData struct {
alps.BaseRenderData
Mailboxes []MailboxInfo
Mailbox *MailboxStatus
Message *IMAPMessage
Part *IMAPPartNode
View interface{}
MailboxPage int
Flags map[string]bool
}
func handleGetPart(ctx *alps.Context, raw bool) error {
mboxName, uid, err := parseMboxAndUid(ctx.Param("mbox"), ctx.Param("uid"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
partPath, err := parsePartPath(ctx.QueryParam("part"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
settings, err := loadSettings(ctx.Session.Store())
if err != nil {
return err
}
messagesPerPage := settings.MessagesPerPage
var mailboxes []MailboxInfo
var msg *IMAPMessage
var part *message.Entity
var mbox *MailboxStatus
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
var err error
if mailboxes, err = listMailboxes(c); err != nil {
return err
}
if msg, part, err = getMessagePart(c, mboxName, uid, partPath); err != nil {
return err
}
if mbox, err = getMailboxStatus(c, mboxName); err != nil {
return err
}
return nil
})
if err != nil {
return err
}
mimeType, _, err := part.Header.ContentType()
if err != nil {
return fmt.Errorf("failed to parse part Content-Type: %v", err)
}
if len(partPath) == 0 {
mimeType = "message/rfc822"
}
if raw {
ctx.Response().Header().Set("Content-Type", mimeType)
disp, dispParams, _ := part.Header.ContentDisposition()
filename := dispParams["filename"]
if len(partPath) == 0 {
filename = msg.Envelope.Subject + ".eml"
}
// TODO: set Content-Length if possible
// Be careful not to serve types like text/html as inline
if !strings.EqualFold(mimeType, "text/plain") || strings.EqualFold(disp, "attachment") {
dispParams := make(map[string]string)
if filename != "" {
dispParams["filename"] = filename
}
disp := mime.FormatMediaType("attachment", dispParams)
ctx.Response().Header().Set("Content-Disposition", disp)
}
if len(partPath) == 0 {
return part.WriteTo(ctx.Response())
} else {
return ctx.Stream(http.StatusOK, mimeType, part.Body)
}
}
view, err := viewMessagePart(ctx, msg, part)
if err == ErrViewUnsupported {
view = nil
}
flags := make(map[string]bool)
for _, f := range mbox.PermanentFlags {
f = imap.CanonicalFlag(f)
if f == imap.TryCreateFlag {
continue
}
flags[f] = msg.HasFlag(f)
}
return ctx.Render(http.StatusOK, "message.html", &MessageRenderData{
BaseRenderData: *alps.NewBaseRenderData(ctx).
WithTitle(msg.Envelope.Subject),
Mailboxes: mailboxes,
Mailbox: mbox,
Message: msg,
Part: msg.PartByPath(partPath),
View: view,
MailboxPage: int(mbox.Messages-msg.SeqNum) / messagesPerPage,
Flags: flags,
})
}
type ComposeRenderData struct {
alps.BaseRenderData
Message *OutgoingMessage
}
type messagePath struct {
Mailbox string
Uid uint32
}
type composeOptions struct {
Draft *messagePath
Forward *messagePath
InReplyTo *messagePath
}
// Send message, append it to the Sent mailbox, mark the original message as
// answered
func submitCompose(ctx *alps.Context, msg *OutgoingMessage, options *composeOptions) error {
err := ctx.Session.DoSMTP(func(c *smtp.Client) error {
return sendMessage(c, msg)
})
if err != nil {
if _, ok := err.(alps.AuthError); ok {
return echo.NewHTTPError(http.StatusForbidden, err)
}
return fmt.Errorf("failed to send message: %v", err)
}
if inReplyTo := options.InReplyTo; inReplyTo != nil {
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
return markMessageAnswered(c, inReplyTo.Mailbox, inReplyTo.Uid)
})
if err != nil {
return fmt.Errorf("failed to mark original message as answered: %v", err)
}
}
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
if _, err := appendMessage(c, msg, mailboxSent); err != nil {
return err
}
if draft := options.Draft; draft != nil {
if err := deleteMessage(c, draft.Mailbox, draft.Uid); err != nil {
return err
}
}
return nil
})
if err != nil {
return fmt.Errorf("failed to save message to Sent mailbox: %v", err)
}
return ctx.Redirect(http.StatusFound, "/mailbox/INBOX")
}
func handleCompose(ctx *alps.Context, msg *OutgoingMessage, options *composeOptions) error {
if msg.From == "" && strings.ContainsRune(ctx.Session.Username(), '@') {
msg.From = ctx.Session.Username()
}
if ctx.Request().Method == http.MethodPost {
formParams, err := ctx.FormParams()
if err != nil {
return fmt.Errorf("failed to parse form: %v", err)
}
_, saveAsDraft := formParams["save_as_draft"]
msg.From = ctx.FormValue("from")
msg.To = parseAddressList(ctx.FormValue("to"))
msg.Subject = ctx.FormValue("subject")
msg.Text = ctx.FormValue("text")
msg.InReplyTo = ctx.FormValue("in_reply_to")
form, err := ctx.MultipartForm()
if err != nil {
return fmt.Errorf("failed to get multipart form: %v", err)
}
// Fetch previous attachments from original message
var original *messagePath
if options.Draft != nil {
original = options.Draft
} else if options.Forward != nil {
original = options.Forward
}
if original != nil {
for _, s := range form.Value["prev_attachments"] {
path, err := parsePartPath(s)
if err != nil {
return fmt.Errorf("failed to parse original attachment path: %v", err)
}
var part *message.Entity
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
var err error
_, part, err = getMessagePart(c, original.Mailbox, original.Uid, path)
return err
})
if err != nil {
return fmt.Errorf("failed to fetch attachment from original message: %v", err)
}
var buf bytes.Buffer
if _, err := io.Copy(&buf, part.Body); err != nil {
return fmt.Errorf("failed to copy attachment from original message: %v", err)
}
h := mail.AttachmentHeader{part.Header}
mimeType, _, _ := h.ContentType()
filename, _ := h.Filename()
msg.Attachments = append(msg.Attachments, &imapAttachment{
Mailbox: original.Mailbox,
Uid: original.Uid,
Node: &IMAPPartNode{
Path: path,
MIMEType: mimeType,
Filename: filename,
},
Body: buf.Bytes(),
})
}
} else if len(form.Value["prev_attachments"]) > 0 {
return fmt.Errorf("previous attachments specified but no original message available")
}
for _, fh := range form.File["attachments"] {
msg.Attachments = append(msg.Attachments, &formAttachment{fh})
}
if saveAsDraft {
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
copied, err := appendMessage(c, msg, mailboxDrafts)
if err != nil {
return err
}
if !copied {
return fmt.Errorf("no Draft mailbox found")
}
if draft := options.Draft; draft != nil {
if err := deleteMessage(c, draft.Mailbox, draft.Uid); err != nil {
return err
}
}
return nil
})
if err != nil {
return fmt.Errorf("failed to save message to Draft mailbox: %v", err)
}
return ctx.Redirect(http.StatusFound, "/mailbox/INBOX")
} else {
return submitCompose(ctx, msg, options)
}
}
return ctx.Render(http.StatusOK, "compose.html", &ComposeRenderData{
BaseRenderData: *alps.NewBaseRenderData(ctx),
Message: msg,
})
}
func handleComposeNew(ctx *alps.Context) error {
// These are common mailto URL query parameters
// TODO: cc, bcc
return handleCompose(ctx, &OutgoingMessage{
To: strings.Split(ctx.QueryParam("to"), ","),
Subject: ctx.QueryParam("subject"),
Text: ctx.QueryParam("body"),
InReplyTo: ctx.QueryParam("in-reply-to"),
}, &composeOptions{})
}
func unwrapIMAPAddressList(addrs []*imap.Address) []string {
l := make([]string, len(addrs))
for i, addr := range addrs {
l[i] = addr.Address()
}
return l
}
func handleReply(ctx *alps.Context) error {
var inReplyToPath messagePath
var err error
inReplyToPath.Mailbox, inReplyToPath.Uid, err = parseMboxAndUid(ctx.Param("mbox"), ctx.Param("uid"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
var msg OutgoingMessage
if ctx.Request().Method == http.MethodGet {
// Populate fields from original message
partPath, err := parsePartPath(ctx.QueryParam("part"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
var inReplyTo *IMAPMessage
var part *message.Entity
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
var err error
inReplyTo, part, err = getMessagePart(c, inReplyToPath.Mailbox, inReplyToPath.Uid, partPath)
return err
})
if err != nil {
return err
}
mimeType, _, err := part.Header.ContentType()
if err != nil {
return fmt.Errorf("failed to parse part Content-Type: %v", err)
}
if !strings.EqualFold(mimeType, "text/plain") {
err := fmt.Errorf("cannot reply to %q part", mimeType)
return echo.NewHTTPError(http.StatusBadRequest, err)
}
// TODO: strip HTML tags if text/html
msg.Text, err = quote(part.Body)
if err != nil {
return err
}
msg.InReplyTo = inReplyTo.Envelope.MessageId
// TODO: populate From from known user addresses and inReplyTo.Envelope.To
replyTo := inReplyTo.Envelope.ReplyTo
if len(replyTo) == 0 {
replyTo = inReplyTo.Envelope.From
}
msg.To = unwrapIMAPAddressList(replyTo)
msg.Subject = inReplyTo.Envelope.Subject
if !strings.HasPrefix(strings.ToLower(msg.Subject), "re:") {
msg.Subject = "Re: " + msg.Subject
}
}
return handleCompose(ctx, &msg, &composeOptions{InReplyTo: &inReplyToPath})
}
func handleForward(ctx *alps.Context) error {
var sourcePath messagePath
var err error
sourcePath.Mailbox, sourcePath.Uid, err = parseMboxAndUid(ctx.Param("mbox"), ctx.Param("uid"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
var msg OutgoingMessage
if ctx.Request().Method == http.MethodGet {
// Populate fields from original message
partPath, err := parsePartPath(ctx.QueryParam("part"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
var source *IMAPMessage
var part *message.Entity
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
var err error
source, part, err = getMessagePart(c, sourcePath.Mailbox, sourcePath.Uid, partPath)
return err
})
if err != nil {
return err
}
mimeType, _, err := part.Header.ContentType()
if err != nil {
return fmt.Errorf("failed to parse part Content-Type: %v", err)
}
if !strings.EqualFold(mimeType, "text/plain") {
err := fmt.Errorf("cannot forward %q part", mimeType)
return echo.NewHTTPError(http.StatusBadRequest, err)
}
msg.Text, err = quote(part.Body)
if err != nil {
return err
}
msg.Subject = source.Envelope.Subject
if !strings.HasPrefix(strings.ToLower(msg.Subject), "fwd:") &&
!strings.HasPrefix(strings.ToLower(msg.Subject), "fw:") {
msg.Subject = "Fwd: " + msg.Subject
}
msg.InReplyTo = source.Envelope.InReplyTo
attachments := source.Attachments()
for i := range attachments {
// No need to populate attachment body here, we just need the
// metadata
msg.Attachments = append(msg.Attachments, &imapAttachment{
Mailbox: sourcePath.Mailbox,
Uid: sourcePath.Uid,
Node: &attachments[i],
})
}
}
return handleCompose(ctx, &msg, &composeOptions{Forward: &sourcePath})
}
func handleEdit(ctx *alps.Context) error {
var sourcePath messagePath
var err error
sourcePath.Mailbox, sourcePath.Uid, err = parseMboxAndUid(ctx.Param("mbox"), ctx.Param("uid"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
// TODO: somehow get the path to the In-Reply-To message (with a search?)
var msg OutgoingMessage
if ctx.Request().Method == http.MethodGet {
// Populate fields from source message
partPath, err := parsePartPath(ctx.QueryParam("part"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
var source *IMAPMessage
var part *message.Entity
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
var err error
source, part, err = getMessagePart(c, sourcePath.Mailbox, sourcePath.Uid, partPath)
return err
})
if err != nil {
return err
}
mimeType, _, err := part.Header.ContentType()
if err != nil {
return fmt.Errorf("failed to parse part Content-Type: %v", err)
}
if !strings.EqualFold(mimeType, "text/plain") {
err := fmt.Errorf("cannot edit %q part", mimeType)
return echo.NewHTTPError(http.StatusBadRequest, err)
}
b, err := ioutil.ReadAll(part.Body)
if err != nil {
return fmt.Errorf("failed to read part body: %v", err)
}
msg.Text = string(b)
if len(source.Envelope.From) > 0 {
msg.From = source.Envelope.From[0].Address()
}
msg.To = unwrapIMAPAddressList(source.Envelope.To)
msg.Subject = source.Envelope.Subject
msg.InReplyTo = source.Envelope.InReplyTo
// TODO: preserve Message-Id
attachments := source.Attachments()
for i := range attachments {
// No need to populate attachment body here, we just need the
// metadata
msg.Attachments = append(msg.Attachments, &imapAttachment{
Mailbox: sourcePath.Mailbox,
Uid: sourcePath.Uid,
Node: &attachments[i],
})
}
}
return handleCompose(ctx, &msg, &composeOptions{Draft: &sourcePath})
}
func formOrQueryParam(ctx *alps.Context, k string) string {
if v := ctx.FormValue(k); v != "" {
return v
}
return ctx.QueryParam(k)
}
func handleMove(ctx *alps.Context) error {
mboxName, err := url.PathUnescape(ctx.Param("mbox"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
formParams, err := ctx.FormParams()
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
uids, err := parseUidList(formParams["uids"])
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
to := formOrQueryParam(ctx, "to")
if to == "" {
return echo.NewHTTPError(http.StatusBadRequest, "missing 'to' form parameter")
}
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
mc := imapmove.NewClient(c)
if err := ensureMailboxSelected(c, mboxName); err != nil {
return err
}
var seqSet imap.SeqSet
seqSet.AddNum(uids...)
if err := mc.UidMoveWithFallback(&seqSet, to); err != nil {
return fmt.Errorf("failed to move message: %v", err)
}
// TODO: get the UID of the message in the destination mailbox with UIDPLUS
return nil
})
if err != nil {
return err
}
if path := formOrQueryParam(ctx, "next"); path != "" {
return ctx.Redirect(http.StatusFound, path)
}
return ctx.Redirect(http.StatusFound, fmt.Sprintf("/mailbox/%v", url.PathEscape(to)))
}
func handleDelete(ctx *alps.Context) error {
mboxName, err := url.PathUnescape(ctx.Param("mbox"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
formParams, err := ctx.FormParams()
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
uids, err := parseUidList(formParams["uids"])
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
if err := ensureMailboxSelected(c, mboxName); err != nil {
return err
}
var seqSet imap.SeqSet
seqSet.AddNum(uids...)
item := imap.FormatFlagsOp(imap.AddFlags, true)
flags := []interface{}{imap.DeletedFlag}
if err := c.UidStore(&seqSet, item, flags, nil); err != nil {
return fmt.Errorf("failed to add deleted flag: %v", err)
}
if err := c.Expunge(nil); err != nil {
return fmt.Errorf("failed to expunge mailbox: %v", err)
}
// Deleting a message invalidates our cached message count
// TODO: listen to async updates instead
if _, err := c.Select(mboxName, false); err != nil {
return fmt.Errorf("failed to select mailbox: %v", err)
}
return nil
})
if err != nil {
return err
}
if path := formOrQueryParam(ctx, "next"); path != "" {
return ctx.Redirect(http.StatusFound, path)
}
return ctx.Redirect(http.StatusFound, fmt.Sprintf("/mailbox/%v", url.PathEscape(mboxName)))
}
func handleSetFlags(ctx *alps.Context) error {
mboxName, err := url.PathUnescape(ctx.Param("mbox"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
formParams, err := ctx.FormParams()
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
uids, err := parseUidList(formParams["uids"])
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
flags, ok := formParams["flags"]
if !ok {
flagsStr := ctx.QueryParam("to")
if flagsStr == "" {
return echo.NewHTTPError(http.StatusBadRequest, "missing 'flags' form parameter")
}
flags = strings.Fields(flagsStr)
}
actionStr := ctx.FormValue("action")
if actionStr == "" {
actionStr = ctx.QueryParam("action")
}
var op imap.FlagsOp
switch actionStr {
case "", "set":
op = imap.SetFlags
case "add":
op = imap.AddFlags
case "remove":
op = imap.RemoveFlags
default:
return echo.NewHTTPError(http.StatusBadRequest, "invalid 'action' value")
}
err = ctx.Session.DoIMAP(func(c *imapclient.Client) error {
if err := ensureMailboxSelected(c, mboxName); err != nil {
return err
}
var seqSet imap.SeqSet
seqSet.AddNum(uids...)
storeItems := make([]interface{}, len(flags))
for i, f := range flags {
storeItems[i] = f
}
item := imap.FormatFlagsOp(op, true)
if err := c.UidStore(&seqSet, item, storeItems, nil); err != nil {
return fmt.Errorf("failed to add deleted flag: %v", err)
}
return nil
})
if err != nil {
return err
}
if path := formOrQueryParam(ctx, "next"); path != "" {
return ctx.Redirect(http.StatusFound, path)
}
if len(uids) != 1 || (op == imap.RemoveFlags && len(flags) == 1 && flags[0] == imap.SeenFlag) {
// Redirecting to the message view would mark the message as read again
return ctx.Redirect(http.StatusFound, fmt.Sprintf("/mailbox/%v", url.PathEscape(mboxName)))
}
return ctx.Redirect(http.StatusFound, fmt.Sprintf("/message/%v/%v", url.PathEscape(mboxName), uids[0]))
}
const settingsKey = "base.settings"
const maxMessagesPerPage = 100
type Settings struct {
MessagesPerPage int
}
func loadSettings(s alps.Store) (*Settings, error) {
settings := &Settings{
MessagesPerPage: 50,
}
if err := s.Get(settingsKey, settings); err != nil && err != alps.ErrNoStoreEntry {
return nil, err
}
if err := settings.check(); err != nil {
return nil, err
}
return settings, nil
}
func (s *Settings) check() error {
if s.MessagesPerPage <= 0 || s.MessagesPerPage > maxMessagesPerPage {
return fmt.Errorf("messages per page out of bounds: %v", s.MessagesPerPage)
}
return nil
}
type SettingsRenderData struct {
alps.BaseRenderData
Settings *Settings
}
func handleSettings(ctx *alps.Context) error {
settings, err := loadSettings(ctx.Session.Store())
if err != nil {
return fmt.Errorf("failed to load settings: %v", err)
}
if ctx.Request().Method == http.MethodPost {
settings.MessagesPerPage, err = strconv.Atoi(ctx.FormValue("messages_per_page"))
if err != nil {
return echo.NewHTTPError(http.StatusBadRequest, "invalid messages per page: %v", err)
}
if err := settings.check(); err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
if err := ctx.Session.Store().Put(settingsKey, settings); err != nil {
return fmt.Errorf("failed to save settings: %v", err)
}
return ctx.Redirect(http.StatusFound, "/mailbox/INBOX")
}
return ctx.Render(http.StatusOK, "settings.html", &SettingsRenderData{
BaseRenderData: *alps.NewBaseRenderData(ctx),
Settings: settings,
})
}