init: first init

.dockerignore

@@ -0,0 +1,4 @@
+.git
+.gitignore
+*.env
+README.md

.gitignore

@@ -0,0 +1,30 @@
+# Go binaries
+/bin/
+/bin/*
+
+# Dependency directories (remove the comment below if you use modules)
+# vendor/
+
+# Go test binary, build cache, and other artifacts
+*.test
+*.out
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# IDE and editor files
+*.idea/
+*.vscode/
+*.swp
+*.swo
+*.sublime-workspace
+*.sublime-project
+
+# OS generated files
+.DS_Store
+Thumbs.db
+
+token/
+token.json

Dockerfile

@@ -0,0 +1,28 @@
+FROM golang:1.26-alpine AS builder
+
+# Set workdir
+WORKDIR /lib/autocal
+
+# Copy go modules
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy rest of source code
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /lib/autocal/app .
+
+# Final stage
+FROM alpine:latest
+
+RUN addgroup -S autocal_group && adduser -S autocal_user -G autocal_group
+USER autocal_user
+
+WORKDIR /lib/autocal
+
+COPY --from=builder /lib/autocal/app .
+COPY --from=builder /lib/autocal/credentials.json .
+
+EXPOSE 4444
+
+ENTRYPOINT ["/lib/autocal/app"]

autocal.yml

@@ -0,0 +1,17 @@
+# Set the amount of time between calendar checks
+interval: 60 # in minutes
+
+# Setup notifications for invites
+notifications:
+  logging: true
+
+
+# Declare events to automatically invite people to
+events:
+  - name: Hotschedules
+    exact_name: false # Whether to use exact event name or use keyword
+    participants: [ "sarah.shannonclt@gmail.com" ]
+
+  - name: Therapy
+    exact_name: true
+    participants: [ "sarah.shannonclt@gmail.com" ]

config/parser.go

@@ -0,0 +1,27 @@
+package config
+
+import (
+	"autocal/pkg/autocal"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Parse autocal.yml
+func ParseAutocal(path string) (*autocal.Autocal, error) {
+	// Open file
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create empty config
+	var autocal autocal.Autocal
+
+	// Unmarshal YAML
+	if err := yaml.Unmarshal(data, &autocal); err != nil {
+		return nil, err
+	}
+
+	return &autocal, nil
+}

credentials.json

@@ -0,0 +1 @@
+{"installed":{"client_id":"456144269477-cgd4f7fsbl5n5m4n52s9f63ep10sf2n9.apps.googleusercontent.com","project_id":"autocal-489320","auth_uri":"https://accounts.google.com/o/oauth2/auth","token_uri":"https://oauth2.googleapis.com/token","auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs","client_secret":"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","redirect_uris":["http://localhost:4444/callback"]}}

go.mod

@@ -0,0 +1,50 @@
+module autocal
+
+go 1.25.7
+
+require (
+	github.com/charmbracelet/log v0.4.2
+	golang.org/x/oauth2 v0.35.0
+	google.golang.org/api v0.269.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	cloud.google.com/go/auth v0.18.2 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
+	cloud.google.com/go/compute/metadata v0.9.0 // indirect
+	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
+	github.com/charmbracelet/lipgloss v1.1.0 // indirect
+	github.com/charmbracelet/x/ansi v0.8.0 // indirect
+	github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd // indirect
+	github.com/charmbracelet/x/term v0.2.1 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logfmt/logfmt v0.6.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.12 // indirect
+	github.com/googleapis/gax-go/v2 v2.17.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/muesli/termenv v0.16.0 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 // indirect
+	go.opentelemetry.io/otel v1.39.0 // indirect
+	go.opentelemetry.io/otel/metric v1.39.0 // indirect
+	go.opentelemetry.io/otel/trace v1.39.0 // indirect
+	golang.org/x/crypto v0.48.0 // indirect
+	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
+	golang.org/x/net v0.50.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/text v0.34.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260217215200-42d3e9bedb6d // indirect
+	google.golang.org/grpc v1.79.1 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+)

go.sum

@@ -0,0 +1,116 @@
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+cloud.google.com/go/compute/metadata v0.9.0 h1:pDUj4QMoPejqq20dK0Pg2N4yG9zIkYGdBtwLoEkH9Zs=
+cloud.google.com/go/compute/metadata v0.9.0/go.mod h1:E0bWwX5wTnLPedCKqk3pJmVgCBSM6qQI1yTBdEb3C10=
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+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
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+google.golang.org/api v0.269.0/go.mod h1:N8Wpcu23Tlccl0zSHEkcAZQKDLdquxK+l9r2LkwAauE=
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jobs/jobs.go

@@ -0,0 +1,119 @@
+package jobs
+
+import (
+	"autocal/pkg/autocal"
+	"autocal/services"
+	"strings"
+	"time"
+
+	"github.com/charmbracelet/log"
+	"google.golang.org/api/calendar/v3"
+)
+
+// Start jobs
+func Start(calSrv *calendar.Service, config *autocal.Autocal) {
+	// Setup time
+	t := time.Now().Format(time.RFC3339)
+
+	// Create events channel
+	events := make(chan *calendar.Event)
+
+	// Start event watcher
+	go func() {
+		checkForNewEvents(calSrv, config, t, events)
+	}()
+
+	// Wait for jobs
+	for event := range events {
+		// Loop through rules in config	
+		for _, rule := range config.Events {
+			// Check if the event name matches the rule
+			// either by exact name or by keyword
+			isMatch := (rule.ExactName && event.Summary == rule.Name) || (!rule.ExactName && strings.Contains(event.Summary, rule.Name))
+
+			if isMatch {
+				if config.Notifications.Logging {
+					log.Info("Found matching event", "event", event.Summary, "rule", rule.Name)
+				}
+
+				// Add participants to the event
+				go func(e *calendar.Event) {
+					err := addParticipantsToEvent(calSrv, e, &config.Notifications, rule.Participants)
+					if err != nil {
+						log.Error("Failed to add participants", "err", err)
+					}
+				}(event)
+
+
+				// Once a rule matches, we can stop checking other rules for this event
+				break
+			}
+		}
+
+	}
+}
+
+func addParticipantsToEvent(calSrv *calendar.Service, event *calendar.Event, notifications *autocal.Notifications, participants []string) error {
+	// Create a map of existing attendees for quick lookup
+	existingAttendees := make(map[string]bool)
+	for _, attendee := range event.Attendees {
+		existingAttendees[attendee.Email] = true
+	}
+
+	// Flag to check if we need to update the event
+	shouldUpdate := false
+
+	// Add new participants if they are not already in the event
+	for _, participant := range participants {
+		if !existingAttendees[participant] {
+			event.Attendees = append(event.Attendees, &calendar.EventAttendee{ Email: participant })
+			shouldUpdate = true
+			if notifications.Logging {
+				log.Info("Adding new participant", "event", event.Summary, "participant", participant)
+			}
+		}
+	}
+
+	// If we've added new attendees, update the event in Google Calendar
+	if shouldUpdate {
+		_, err := calSrv.Events.Update("primary", event.Id, event).Do()
+		if err != nil {
+			return err
+		}
+		if notifications.Logging {
+			log.Info("Successfully updated event", "event", event.Summary)
+		}
+	}
+
+	return nil
+}
+
+// Checks periodically for new events
+func checkForNewEvents(calSrv *calendar.Service, config *autocal.Autocal, t string, eventsCh chan *calendar.Event) {
+	// Create ticker
+	interval := time.Duration(config.Interval) * time.Minute
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+
+	// Start loop
+	for {
+		// Get events
+		log.Info("Checking for new events")
+		events, err := services.ListEvents(calSrv, "primary", false, true, t, 10, "startTime")
+		if err != nil {
+			log.Fatal("Failed to fetch events", "err", err)
+		}
+
+		// Send events
+		if len(events.Items) > 0 {
+			for _, event := range events.Items {
+				eventsCh <- event
+			}
+			// Update the time to the last event checked to avoid processing the same events again
+			t = events.Items[len(events.Items)-1].Created
+		}
+		
+		// Wait for next tick
+		<-ticker.C
+	}
+}

main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	autocal_config "autocal/config"
+	"autocal/jobs"
+	"autocal/token"
+	"context"
+	"os"
+
+	"github.com/charmbracelet/log"
+	"golang.org/x/oauth2/google"
+	"google.golang.org/api/calendar/v3"
+	"google.golang.org/api/option"
+)
+
+func main() {
+	ctx := context.Background()
+	b, err := os.ReadFile("credentials.json")
+	if err != nil {
+		log.Fatal("Unable to read client secret file", "err", err)
+	}
+
+	// Setup oauth2 config
+	config, err := google.ConfigFromJSON(b, calendar.CalendarScope)
+	if err != nil {
+		log.Fatal("Unable to parse client secret file to config", "err", err)
+	}
+	
+	// Get oauth2 client
+	client := token.GetClient(config)
+
+	// Setup calendar service
+	calService, err := calendar.NewService(ctx, option.WithHTTPClient(client))
+	if err != nil {
+		log.Fatal("Unable to retrieve Calendar client", "err", err)
+	}
+
+	// Parse autocal.yml
+	calConfig, err := autocal_config.ParseAutocal("./autocal.yml")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Start job
+	jobs.Start(calService, calConfig)
+}

pkg/autocal/autocal.go

@@ -0,0 +1,18 @@
+package autocal
+
+// Represents an autocal.yml file
+type Autocal struct {
+	Interval int `yaml:"interval"` // Refresh interval (in seconds)
+	Notifications Notifications `yaml:"notifications"` // Notification config
+	Events []Event `yaml:"events"` // Event configuration
+}
+
+type Notifications struct {
+	Logging bool `yaml:"logging"` // Log invites to console
+}
+
+type Event struct {
+	Name string `yaml:"name"` // Event name (title)
+	ExactName bool `yaml:"exact_name"` // Use exact name or keyword filtering
+	Participants []string `yaml:"participants"` // Participant's email to invite
+}

services/calendar.go

@@ -0,0 +1,15 @@
+package services
+
+import (
+	"google.golang.org/api/calendar/v3"
+)
+
+// List calendar events
+func ListEvents(srv *calendar.Service, calendarID string, showDeleted, singleEvents bool, timeMin string, maxResults int64, orderBy string) (*calendar.Events, error) {
+	events, err := srv.Events.List(calendarID).ShowDeleted(showDeleted).SingleEvents(singleEvents).TimeMin(timeMin).MaxResults(maxResults).OrderBy(orderBy).Do()
+	if err != nil {
+		return nil, err
+	}
+
+	return events, nil
+}