feat: Implement option to enable / disable sync of declined events

.github/dependabot.yml

@@ -1,3 +1,4 @@
+---
 # To get started with Dependabot version updates, you'll need to specify which
 # package ecosystems to update and where the package manifests are located.
 # Please see the documentation for all configuration options:

.github/workflows/build.yaml

@@ -3,9 +3,9 @@ name: Build
 on: [ push ]
 
 env:
-  GO_VERSION: '1.20.4'
-  GO_VERSION_SHORT: '1.20'
-  GOLANGCI_VERSION: 'v1.52.2'
+  GO_VERSION: '1.21.0'
+  GO_VERSION_SHORT: '1.21'
+  GOLANGCI_VERSION: 'v1.54.0'
   STATICCHECK_VERSION: '2023.1.3'
 
 permissions:

.github/workflows/release.yaml

@@ -5,6 +5,9 @@ on:
     tags:
       - 'v*'
 
+env:
+  GO_VERSION: '1.21.0'
+
 permissions:
   contents: write
   packages: write
@@ -19,6 +22,8 @@ jobs:
           fetch-depth: 0
       - name: Set up Go
         uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
 
       - name: Log in to GitHub container registry
         uses: docker/login-action@v2

.goreleaser.yaml

@@ -1,3 +1,4 @@
+---
 before:
   hooks:
     - go mod tidy

README.md

@@ -135,6 +135,21 @@ transformations:
 The transformers are applied in a specific order. The order is defined here:
 [`internal/sync/transformer.go`](./internal/sync/transformer.go)
 
+## Filters
+
+In some cases events should not be synced. For example, declined events might
+create too much noise in the target calendar. These can be filtered by enabling
+the corresponding filter.
+
+```yaml
+# Filters remove events from being synced due to different criteria
+filters:
+  # Events where you declined the invitation aren't synced
+  - name: DeclinedEvents
+  # Events which cover the full day aren't synced
+  - name: AllDayEvents
+```
+
 # Cleaning Up
 
 You just synced a lot of events in your calendar and decide you want to use a

cmd/calendarsync/main.go

@@ -164,7 +164,7 @@ func Run(c *cli.Context) error {
 		}
 	}
 
-	controller := sync.NewController(log.Default(), sourceAdapter, sinkAdapter, sync.TransformerFactory(cfg.Transformations)...)
+	controller := sync.NewController(log.Default(), sourceAdapter, sinkAdapter, sync.TransformerFactory(cfg.Transformations), sync.FilterFactory(cfg.Filters))
 	if cfg.UpdateConcurrency != 0 {
 		controller.SetConcurrency(cfg.UpdateConcurrency)
 	}

docker-compose.yml

@@ -1,3 +1,4 @@
+---
 version: '3.4'
 
 services:

example.sync.yaml

@@ -54,6 +54,13 @@ transformations:
     config:
       UseEmailAsDisplayName: true
 
+# Filters remove events from being synced due to different criteria
+filters:
+  # Events where you declined the invitation aren't synced
+  - name: DeclinedEvents
+  # Events which cover the full day aren't synced
+  - name: AllDayEvents
+
 # Perform multiple calendar updates concurrently
 # Defaults to 1 if not set
 updateConcurrency: 3

internal/adapter/google/event.go

@@ -15,7 +15,11 @@ func calendarEventToEvent(e *calendar.Event, adapterSourceID string) models.Even
 	metadata := ensureMetadata(e, adapterSourceID)
 
 	var attendees []models.Attendee
+	var hasEventAccepted bool = true
 	for _, eventAttendee := range e.Attendees {
+		if eventAttendee.Self && eventAttendee.ResponseStatus == "declined" {
+			hasEventAccepted = false
+		}
 		attendees = append(attendees, models.Attendee{
 			Email:       eventAttendee.Email,
 			DisplayName: eventAttendee.DisplayName,
@@ -47,6 +51,7 @@ func calendarEventToEvent(e *calendar.Event, adapterSourceID string) models.Even
 		Attendees:   attendees,
 		Reminders:   reminders,
 		MeetingLink: e.HangoutLink,
+		Accepted:    hasEventAccepted,
 	}
 }
 

internal/adapter/outlook_http/client.go

@@ -267,6 +267,10 @@ func (o OutlookClient) outlookEventToEvent(oe Event, adapterSourceID string) (e
 			},
 		})
 	}
+	var hasEventAccepted bool = true
+	if oe.ResponseStatus.Response == "declined" {
+		hasEventAccepted = false
+	}
 
 	bufEvent = models.Event{
 		ICalUID:     oe.UID,
@@ -280,6 +284,7 @@ func (o OutlookClient) outlookEventToEvent(oe Event, adapterSourceID string) (e
 		Attendees:   attendees,
 		Reminders:   reminders,
 		MeetingLink: oe.OnlineMeetingUrl,
+		Accepted:    hasEventAccepted,
 	}
 
 	if oe.IsAllDay {

internal/adapter/outlook_http/models.go

@@ -12,21 +12,22 @@ type EventList struct {
 }
 
 type Event struct {
-	ID                         string       `json:"id"`
-	UID                        string       `json:"iCalUId"`
-	ChangeKey                  string       `json:"changeKey"`
-	HtmlLink                   string       `json:"webLink"`
-	Subject                    string       `json:"subject"`
-	Start                      Time         `json:"start"`
-	End                        Time         `json:"end"`
-	Body                       Body         `json:"body,omitempty"`
-	Attendees                  []Attendee   `json:"attendees,omitempty"`
-	Location                   Location     `json:"location"`
-	IsReminderOn               bool         `json:"isReminderOn"`
-	ReminderMinutesBeforeStart int          `json:"reminderMinutesBeforeStart"`
-	Extensions                 []Extensions `json:"extensions"`
-	IsAllDay                   bool         `json:"isAllDay"`
-	OnlineMeetingUrl           string       `json:"onlineMeetingUrl"`
+	ID                         string         `json:"id"`
+	UID                        string         `json:"iCalUId"`
+	ChangeKey                  string         `json:"changeKey"`
+	HtmlLink                   string         `json:"webLink"`
+	Subject                    string         `json:"subject"`
+	Start                      Time           `json:"start"`
+	End                        Time           `json:"end"`
+	Body                       Body           `json:"body,omitempty"`
+	Attendees                  []Attendee     `json:"attendees,omitempty"`
+	Location                   Location       `json:"location"`
+	IsReminderOn               bool           `json:"isReminderOn"`
+	ReminderMinutesBeforeStart int            `json:"reminderMinutesBeforeStart"`
+	Extensions                 []Extensions   `json:"extensions"`
+	IsAllDay                   bool           `json:"isAllDay"`
+	OnlineMeetingUrl           string         `json:"onlineMeetingUrl"`
+	ResponseStatus             ResponseStatus `json:"responseStatus,omitempty"`
 }
 
 type Extensions struct {
@@ -36,6 +37,12 @@ type Extensions struct {
 	models.Metadata
 }
 
+type ResponseStatus struct {
+	Response string `json:"response,omitempty"`
+	// there's an additional field called `time` which returns date and time when the response was returned
+	// but we don't need that
+}
+
 type Body struct {
 	ContentType string `json:"contentType,omitempty"`
 	Content     string `json:"content,omitempty"`

internal/config/config.go

@@ -8,11 +8,11 @@ import (
 )
 
 type File struct {
-	Path   string
-	Auth   AuthStorage
-	Source Source `yaml:"source"`
-	Sink   Sink   `yaml:"sink"`
-	// TODO: filters for source events
+	Path              string
+	Auth              AuthStorage
+	Source            Source        `yaml:"source"`
+	Sink              Sink          `yaml:"sink"`
+	Filters           []Filter      `yaml:"filters,omitempty"`
 	Transformations   []Transformer `yaml:"transformations,omitempty"`
 	Sync              Sync          `yaml:"sync"`
 	UpdateConcurrency int           `yaml:"updateConcurrency,omitempty"`
@@ -77,6 +77,13 @@ type Transformer struct {
 	Config CustomMap `yaml:"config"`
 }
 
+type Filter struct {
+	// Name of the filter
+	Name string `yaml:"name"`
+	// Any kind of parameter which can be passed to a filter.
+	Config CustomMap `yaml:"config"`
+}
+
 // Sync configuration
 type Sync struct {
 	StartTime SyncTime `yaml:"start"`

internal/filter/allDayEvents.go

@@ -0,0 +1,16 @@
+package filter
+
+import (
+	"github.com/inovex/CalendarSync/internal/models"
+)
+
+type AllDayEvents struct {
+}
+
+func (a AllDayEvents) Name() string {
+	return "AllDayEvents"
+}
+
+func (a AllDayEvents) Filter(event models.Event) bool {
+	return !event.AllDay
+}

internal/filter/declinedEvents.go

@@ -0,0 +1,15 @@
+package filter
+
+import (
+	"github.com/inovex/CalendarSync/internal/models"
+)
+
+type DeclinedEvents struct{}
+
+func (d DeclinedEvents) Name() string {
+	return "DeclinedEvents"
+}
+
+func (d DeclinedEvents) Filter(event models.Event) bool {
+	return event.Accepted
+}

internal/models/event.go

@@ -27,6 +27,7 @@ type Event struct {
 	Attendees   Attendees
 	Reminders   Reminders
 	MeetingLink string
+	Accepted    bool
 }
 
 type Reminders []Reminder

internal/sync/controller.go

@@ -21,17 +21,19 @@ type Controller struct {
 	source Source
 	// transformers are applied in order
 	transformers []Transformer
+	filters      []Filter
 	sink         Sink
 	concurrency  int
 	logger       *log.Logger
 }
 
 // NewController constructs a new Controller.
-func NewController(logger *log.Logger, source Source, sink Sink, transformer ...Transformer) Controller {
+func NewController(logger *log.Logger, source Source, sink Sink, transformer []Transformer, filters []Filter) Controller {
 	return Controller{
 		concurrency:  1,
 		source:       source,
 		transformers: transformer,
+		filters:      filters,
 		sink:         sink,
 		logger:       logger,
 	}
@@ -75,6 +77,20 @@ func (p Controller) SynchroniseTimeframe(ctx context.Context, start time.Time, e
 		return err
 	}
 
+	filteredEventsInSource := []models.Event{}
+
+	for _, filter := range p.filters {
+		p.logger.Info("loaded filter", "name", filter.Name())
+	}
+
+	for _, event := range eventsInSource {
+		if FilterEvent(event, p.filters...) {
+			filteredEventsInSource = append(filteredEventsInSource, event)
+		} else {
+			p.logger.Debug("filter rejects event", logFields(event)...)
+		}
+	}
+
 	// Transform source events before comparing them to the sink events
 	transformedEventsInSource := []models.Event{}
 
@@ -83,7 +99,7 @@ func (p Controller) SynchroniseTimeframe(ctx context.Context, start time.Time, e
 		p.logger.Info("loaded transformer", "name", trans.Name())
 	}
 
-	for _, event := range eventsInSource {
+	for _, event := range filteredEventsInSource {
 		transformedEventsInSource = append(transformedEventsInSource, TransformEvent(event, p.transformers...))
 	}