From a1b43cc5a81c51c35590ed2ea8f47171dc38669c Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Wed, 5 Feb 2020 18:39:53 +0100
Subject: [PATCH] plugins/caldav: add basic event view

---
 go.mod                   |  2 +-
 go.sum                   |  4 +--
 plugins/caldav/routes.go | 57 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/go.mod b/go.mod
index c0c2992..378aa71 100644
--- a/go.mod
+++ b/go.mod
@@ -13,7 +13,7 @@ require (
 	github.com/emersion/go-sasl v0.0.0-20191210011802-430746ea8b9b
 	github.com/emersion/go-smtp v0.12.1
 	github.com/emersion/go-vcard v0.0.0-20191221110513-5f81fa0d3cc7
-	github.com/emersion/go-webdav v0.2.1-0.20200205170548-baf63fb1b759
+	github.com/emersion/go-webdav v0.2.1-0.20200205173846-1d93353e3dee
 	github.com/gorilla/css v1.0.0 // indirect
 	github.com/labstack/echo/v4 v4.1.15-0.20200203180927-504f39abaf32
 	github.com/labstack/gommon v0.3.0
diff --git a/go.sum b/go.sum
index 40f9393..c489df1 100644
--- a/go.sum
+++ b/go.sum
@@ -29,8 +29,8 @@ github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe h1:40SWqY0
 github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe/go.mod h1:aqO8z8wPrjkscevZJFVE1wXJrLpC5LtJG7fqLOsPb2U=
 github.com/emersion/go-vcard v0.0.0-20191221110513-5f81fa0d3cc7 h1:SE+tcd+0kn0cT4MqTo66gmkjqWHF1Z+Yha5/rhLs/H8=
 github.com/emersion/go-vcard v0.0.0-20191221110513-5f81fa0d3cc7/go.mod h1:HMJKR5wlh/ziNp+sHEDV2ltblO4JD2+IdDOWtGcQBTM=
-github.com/emersion/go-webdav v0.2.1-0.20200205170548-baf63fb1b759 h1:8joXUXgdaV935H/AUKhnyvUf754VcjmQAenNsakT4pA=
-github.com/emersion/go-webdav v0.2.1-0.20200205170548-baf63fb1b759/go.mod h1:dfzmdPRkPLLUQU00fDfwPJomgFmdblZpMoh3CaUsGCc=
+github.com/emersion/go-webdav v0.2.1-0.20200205173846-1d93353e3dee h1:xuiEbeyM/8jUYzsucpmvoQOi6j4XVRv0n8NxKHw9UGg=
+github.com/emersion/go-webdav v0.2.1-0.20200205173846-1d93353e3dee/go.mod h1:dfzmdPRkPLLUQU00fDfwPJomgFmdblZpMoh3CaUsGCc=
 github.com/gorilla/css v1.0.0 h1:BQqNyPTi50JCFMTw/b67hByjMVXZRwGha6wxVGkeihY=
 github.com/gorilla/css v1.0.0/go.mod h1:Dn721qIggHpt4+EFCcTLTU/vk5ySda2ReITrtgBl60c=
 github.com/labstack/echo/v4 v4.1.15-0.20200203180927-504f39abaf32 h1:UiIEDYxPPmjl6mMIY4QPDguD/QAtK+gR4IRMSrjWmeA=
diff --git a/plugins/caldav/routes.go b/plugins/caldav/routes.go
index acc879f..7ff831d 100644
--- a/plugins/caldav/routes.go
+++ b/plugins/caldav/routes.go
@@ -16,6 +16,12 @@ type CalendarRenderData struct {
 	Events   []caldav.CalendarObject
 }
 
+type EventRenderData struct {
+	koushin.BaseRenderData
+	Calendar *caldav.Calendar
+	Event    *caldav.CalendarObject
+}
+
 func registerRoutes(p *koushin.GoPlugin, u *url.URL) {
 	p.GET("/calendar", func(ctx *koushin.Context) error {
 		// TODO: multi-calendar support
@@ -63,4 +69,55 @@ func registerRoutes(p *koushin.GoPlugin, u *url.URL) {
 			Events:         events,
 		})
 	})
+
+	p.GET("/calendar/:uid", func(ctx *koushin.Context) error {
+		uid := ctx.Param("uid")
+
+		c, calendar, err := getCalendar(u, ctx.Session)
+		if err != nil {
+			return err
+		}
+
+		query := caldav.CalendarQuery{
+			CompRequest: caldav.CalendarCompRequest{
+				Name:  "VCALENDAR",
+				Props: []string{"VERSION"},
+				Comps: []caldav.CalendarCompRequest{{
+					Name: "VEVENT",
+					Props: []string{
+						"SUMMARY",
+						"DESCRIPTION",
+						"UID",
+						"DTSTART",
+						"DTEND",
+						"DURATION",
+					},
+				}},
+			},
+			CompFilter: caldav.CompFilter{
+				Name: "VCALENDAR",
+				Comps: []caldav.CompFilter{{
+					Name: "VEVENT",
+					Props: []caldav.PropFilter{{
+						Name:      "UID",
+						TextMatch: &caldav.TextMatch{Text: uid},
+					}},
+				}},
+			},
+		}
+		events, err := c.QueryCalendar(calendar.Path, &query)
+		if err != nil {
+			return fmt.Errorf("failed to query calendar: %v", err)
+		}
+		if len(events) != 1 {
+			return fmt.Errorf("expected exactly one calendar object with UID %q, got %v", uid, len(events))
+		}
+		event := &events[0]
+
+		return ctx.Render(http.StatusOK, "event.html", &EventRenderData{
+			BaseRenderData: *koushin.NewBaseRenderData(ctx),
+			Calendar:       calendar,
+			Event:          event,
+		})
+	})
 }