CalDAV support (#15)

pkg/routes/api/v1/caldav.go

@@ -0,0 +1,74 @@
+package v1
+
+import (
+	"code.vikunja.io/api/pkg/caldav"
+	"code.vikunja.io/api/pkg/models"
+	"code.vikunja.io/api/pkg/routes/crud"
+	"github.com/labstack/echo"
+	"net/http"
+	"time"
+)
+
+// Caldav returns a caldav-readable format with all tasks
+func Caldav(c echo.Context) error {
+
+	// swagger:operation GET /tasks/caldav list caldavTasks
+	// ---
+	// summary: Get all tasks as caldav
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/Message"
+	//   "400":
+	//     "$ref": "#/responses/Message"
+	//   "500":
+	//     "$ref": "#/responses/Message"
+
+	// Request basic auth
+	user, pass, ok := c.Request().BasicAuth()
+
+	// Check credentials
+	creds := &models.UserLogin{
+		Username: user,
+		Password: pass,
+	}
+	u, err := models.CheckUserCredentials(creds)
+
+	if !ok || err != nil {
+		c.Response().Header().Set("WWW-Authenticate", `Basic realm="Vikunja cal"`)
+		return c.String(http.StatusUnauthorized, "Unauthorized.")
+	}
+
+	// Get all tasks for that user
+	tasks, err := models.GetTasksByUser(&u)
+	if err != nil {
+		return crud.HandleHTTPError(err)
+	}
+
+	hour := int64(time.Hour.Seconds())
+	var caldavTasks []*caldav.Event
+	for _, t := range tasks {
+		if t.DueDateUnix != 0 {
+			event := &caldav.Event{
+				Summary:       t.Text,
+				Description:   t.Description,
+				UID:           "",
+				TimestampUnix: t.Updated,
+				StartUnix:     t.DueDateUnix,
+				EndUnix:       t.DueDateUnix + hour,
+			}
+
+			if t.ReminderUnix != 0 {
+				event.Alarms = append(event.Alarms, caldav.Alarm{TimeUnix: t.ReminderUnix})
+			}
+
+			caldavTasks = append(caldavTasks, event)
+		}
+	}
+
+	caldavConfig := &caldav.Config{
+		Name:   "Vikunja Calendar for " + u.Username,
+		ProdID: "Vikunja Todo App",
+	}
+
+	return c.String(http.StatusOK, caldav.ParseEvents(caldavConfig, caldavTasks))
+}