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package main
import (
_ "embed"
htmltemplate "html/template"
"net/http"
"strings"
"text/template"
"time"
"codeberg.org/Profpatsch/Profpatsch/users/Profpatsch/mailtext"
)
// appName appears in every delimiter marker.
const appName = "calweb"
//go:embed templates/list.llm
var listSrc string
//go:embed templates/event.llm
var eventSrc string
//go:embed templates/proposed.llm
var proposedSrc string
//go:embed templates/proposals.llm
var proposalsSrc string
//go:embed templates/proposal.llm
var proposalSrc string
//go:embed templates/proposal.html
var proposalHTMLSrc string
//go:embed templates/error.llm
var errorSrc string
func mustParse(name, src string) *template.Template {
return template.Must(template.New(name).Funcs(mailtext.ParseFuncs).Parse(src))
}
var (
listTmpl = mustParse("list.llm", listSrc)
eventTmpl = mustParse("event.llm", eventSrc)
proposedTmpl = mustParse("proposed.llm", proposedSrc)
proposalsTmpl = mustParse("proposals.llm", proposalsSrc)
proposalTmpl = mustParse("proposal.llm", proposalSrc)
errorTmpl = mustParse("error.llm", errorSrc)
proposalHTMLTmpl = htmltemplate.Must(htmltemplate.New("proposal.html").Parse(proposalHTMLSrc))
)
// writeLLM renders a text/llm response with a status. Every route except the
// confirm page answers this way whatever was asked for: there is no HTML to
// fall back to, and a browser shows text/plain fine.
func writeLLM(w http.ResponseWriter, r *http.Request, tmpl *template.Template, data any, status int) {
if status != http.StatusOK {
// mailtext.Write sets the content type and writes the body; the
// status has to be committed by the caller first, but only after the
// headers are set. Wrap the writer to defer it.
w = &statusWriter{ResponseWriter: w, status: status}
}
if !mailtext.WantsLLM(r) {
// Asked for nothing in particular (a browser, a bare curl): serve the
// text as text/plain so a browser displays it rather than offering a
// download of an unknown type.
q := r.URL.Query()
q.Set(mailtext.ViewParam, mailtext.ViewValue)
r2 := r.Clone(r.Context())
r2.URL.RawQuery = q.Encode()
r = r2
}
mailtext.Write(w, r, appName, tmpl, data)
}
type statusWriter struct {
http.ResponseWriter
status int
written bool
}
func (sw *statusWriter) WriteHeader(code int) {
sw.written = true
sw.ResponseWriter.WriteHeader(code)
}
func (sw *statusWriter) Write(b []byte) (int, error) {
if !sw.written {
// An error page from inside mailtext.Write has already called
// WriteHeader; only a successful render reaches here unwritten.
sw.WriteHeader(sw.status)
}
return sw.ResponseWriter.Write(b)
}
// ============================================================================
// Events
// ============================================================================
// eventView is an event prepared for a template. Untrusted strings stay raw;
// the templates pass them through the escaping helpers.
type eventView struct {
ID string
When string
Summary string
Location string
Description string
Status string
Recurring bool
SeriesID string
Recurrence []string
Organizer string
OrganizerMe bool
Attendees []string
Link string
Refusal string
}
func (s *server) view(ev apiEvent) eventView {
v := eventView{
ID: ev.ID,
When: when(ev, s.loc),
Summary: ev.Summary,
Location: ev.Location,
Description: plainDescription(ev.Description),
Status: ev.Status,
Recurring: ev.RecurringEventID != "",
SeriesID: ev.RecurringEventID,
Recurrence: ev.Recurrence,
Organizer: personLabel(ev.Organizer),
OrganizerMe: ev.Organizer.Self,
Link: ev.HTMLLink,
Refusal: editRefusal(ev),
}
for _, a := range ev.Attendees {
l := personLabel(a)
if a.ResponseStatus != "" {
l += " (" + a.ResponseStatus + ")"
}
v.Attendees = append(v.Attendees, l)
}
return v
}
// plainDescription turns an event description into text. Google stores what
// its own editor produced, which is HTML, alongside plain text from other
// clients; telling them apart by content is what mailtext does for mail.
func plainDescription(s string) string {
s = strings.TrimSpace(s)
if s == "" {
return ""
}
if strings.Contains(s, "<") && strings.Contains(s, ">") {
return strings.TrimSpace(mailtext.HTMLToText(s))
}
return s
}
type dayGroup struct {
Day string
Events []eventView
}
func (s *server) groupByDay(evs []apiEvent) []dayGroup {
var out []dayGroup
for _, ev := range evs {
start, _, err := ev.Start.parsed(s.loc)
label := "(unreadable date)"
if err == nil {
label = dayLabel(start)
}
if len(out) == 0 || out[len(out)-1].Day != label {
out = append(out, dayGroup{Day: label})
}
out[len(out)-1].Events = append(out[len(out)-1].Events, s.view(ev))
}
return out
}
type listData struct {
Title string
Query string
From, To time.Time
Capped bool
Days []dayGroup
Count int
}
// Range renders the window inclusively, as a person names it: an agenda to
// midnight on the 16th covers "until the 15th".
func (d listData) Range() string {
return dayLabel(d.From) + " – " + dayLabel(d.To.Add(-time.Second))
}
func (d listData) Max() int { return maxEvents }
type eventData struct {
Ev eventView
Fetched time.Time
}
// ============================================================================
// Proposals
// ============================================================================
type proposalView struct {
Token string
Kind string
Verb string
EventID string
Rows []fieldRow
Created string
Open bool
Applied string
Discarded string
Result *eventView
Title string
}
func (s *server) proposalView(p proposal) proposalView {
v := proposalView{
Token: p.Token,
Kind: string(p.Kind),
EventID: p.EventID,
Rows: p.rows(s.loc),
Created: p.CreatedAt.In(s.loc).Format("2006-01-02 15:04"),
Open: p.Open(),
}
switch p.Kind {
case kindCreate:
v.Verb = "Create this event"
case kindEdit:
v.Verb = "Change this event"
case kindDelete:
v.Verb = "Delete this event"
}
for _, r := range v.Rows {
if r.Field == "title" {
v.Title = r.After
if v.Title == "" {
v.Title = r.Before
}
}
}
if !p.AppliedAt.IsZero() {
v.Applied = p.AppliedAt.In(s.loc).Format("2006-01-02 15:04")
}
if !p.DiscardedAt.IsZero() {
v.Discarded = p.DiscardedAt.In(s.loc).Format("2006-01-02 15:04")
}
if p.Result != nil {
rv := s.view(*p.Result)
v.Result = &rv
}
return v
}
func (s *server) proposalViews(ps []proposal) []proposalView {
out := make([]proposalView, 0, len(ps))
for _, p := range ps {
out = append(out, s.proposalView(p))
}
return out
}
type proposedData struct {
Token string
Kind string
Listen string
}
type proposalsData struct {
Open, Closed []proposalView
}
type errorData struct {
Status int
Message string
}
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