cmd/server/container.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"time"
 
+	"forge.cadoles.com/Cadoles/daddy/internal/mail"
 	"forge.cadoles.com/Cadoles/daddy/internal/model"
 	"forge.cadoles.com/Cadoles/daddy/internal/voter"
 
@@ -108,5 +109,11 @@ func getServiceContainer(ctx context.Context, conf *config.Config) (*service.Con
 		model.NewWorkgroupVoter(),
 	))
 
+	ctn.Provide(mail.ServiceName, mail.ServiceProvider(
+		mail.WithServer(conf.SMTP.Host, conf.SMTP.Port),
+		mail.WithCredentials(conf.SMTP.User, conf.SMTP.Password),
+		mail.WithTLS(conf.SMTP.UseStartTLS, conf.SMTP.InsecureSkipVerify),
+	))
+
 	return ctn, nil
 }

cmd/server/main.go

@@ -153,6 +153,8 @@ func main() {
 		os.Exit(0)
 	}
 
+	go runTaskScheduler(ctx, conf)
+
 	r := chi.NewRouter()
 
 	// Define base middlewares

cmd/server/scheduler.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"gitlab.com/wpetit/goweb/logger"
+
+	"forge.cadoles.com/Cadoles/daddy/internal/config"
+	"forge.cadoles.com/Cadoles/daddy/internal/task"
+	"github.com/pkg/errors"
+	"github.com/robfig/cron/v3"
+)
+
+type cronLogger struct {
+	ctx context.Context
+}
+
+func (l *cronLogger) Info(msg string, keysAndValues ...interface{}) {
+	fields := l.createFields(keysAndValues)
+	logger.Info(l.ctx, msg, fields...)
+}
+
+func (l *cronLogger) Error(err error, msg string, keysAndValues ...interface{}) {
+	fields := l.createFields(keysAndValues)
+	fields = append(fields, logger.E(err))
+	logger.Error(l.ctx, msg, fields...)
+}
+
+func (l *cronLogger) createFields(keysAndValues ...interface{}) []logger.Field {
+	fields := make([]logger.Field, 0)
+
+	var key string
+
+	for _, v := range keysAndValues {
+		children, ok := v.([]interface{})
+		if !ok {
+			continue
+		}
+
+		for i, vv := range children {
+			if i%2 == 0 {
+				key = fmt.Sprintf("%v", vv)
+
+				continue
+			}
+
+			fields = append(fields, logger.F(key, vv))
+		}
+	}
+
+	return fields
+}
+
+func runTaskScheduler(ctx context.Context, conf *config.Config) {
+	c := cron.New(
+		cron.WithLogger(&cronLogger{ctx}),
+	)
+
+	tasks := map[string]task.Task{
+		conf.Task.Newsletter.CronSpec: task.NewNewsletter(
+			ctx,
+			conf.Task.Newsletter.TimeRange,
+			conf.Task.Newsletter.BaseURL,
+			conf.Task.Newsletter.ContentTemplate,
+			conf.Task.Newsletter.SubjectTemplate,
+			conf.SMTP.SenderAddress,
+		),
+	}
+
+	for spec, task := range tasks {
+		if _, err := c.AddFunc(spec, task.Run); err != nil {
+			logger.Fatal(
+				ctx,
+				"could not schedule task",
+				logger.F("task", task.Name()),
+				logger.E(errors.WithStack(err)),
+			)
+
+			return
+		}
+	}
+
+	c.Start()
+}

go.mod

@@ -4,6 +4,7 @@ go 1.14
 
 require (
 	forge.cadoles.com/wpetit/goweb-oidc v0.0.0-20200619080035-4bbf7b016032
+	forge.cadoles.com/wpetit/hydra-passwordless v0.0.0-20200908094025-38ac4422dddc // indirect
 	github.com/99designs/gqlgen v0.11.3
 	github.com/antonmedv/expr v1.8.8
 	github.com/caarlos0/env/v6 v6.2.2
@@ -15,10 +16,14 @@ require (
 	github.com/jackc/pgx v3.6.2+incompatible
 	github.com/jackc/pgx/v4 v4.7.1
 	github.com/jinzhu/gorm v1.9.14
+	github.com/lithammer/dedent v1.1.0
 	github.com/pkg/errors v0.9.1
+	github.com/robfig/cron v1.2.0
+	github.com/robfig/cron/v3 v3.0.1
 	github.com/rs/cors v1.7.0
 	github.com/vektah/gqlparser/v2 v2.0.1
 	github.com/wader/gormstore v0.0.0-20200328121358-65a111a20c23
 	gitlab.com/wpetit/goweb v0.0.0-20200707070104-985ce3eba3c2
+	gopkg.in/mail.v2 v2.3.1
 	gopkg.in/yaml.v2 v2.2.8
 )

go.sum

@@ -16,6 +16,8 @@ cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiy
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 forge.cadoles.com/wpetit/goweb-oidc v0.0.0-20200619080035-4bbf7b016032 h1:qTYaLPsLDlvqDkatONsvrisvfvpHaGe3lQqIaX7FFQQ=
 forge.cadoles.com/wpetit/goweb-oidc v0.0.0-20200619080035-4bbf7b016032/go.mod h1:gkfqGyk7fCj2Z0ngEOCJ3K0FVmqft/8dFV/OnYT1vec=
+forge.cadoles.com/wpetit/hydra-passwordless v0.0.0-20200908094025-38ac4422dddc h1:9gc/1qizPtK6/iMVlizknWUFii75ntl2xSUV/FSC92Y=
+forge.cadoles.com/wpetit/hydra-passwordless v0.0.0-20200908094025-38ac4422dddc/go.mod h1:nANHORi270d5jDXjeJ7B3pMgK9R4J0/17p1IIc+rhOk=
 github.com/99designs/gqlgen v0.11.3 h1:oFSxl1DFS9X///uHV3y6CEfpcXWrDUxVblR4Xib2bs4=
 github.com/99designs/gqlgen v0.11.3/go.mod h1:RgX5GRRdDWNkh4pBrdzNpNPFVsdoUFY2+adM6nb1N+4=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
@@ -48,6 +50,7 @@ github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9Pq
 github.com/antonmedv/expr v1.8.8 h1:uVwIkIBNO2yn4vY2u2DQUqXTmv9jEEMCEcHa19G5weY=
 github.com/antonmedv/expr v1.8.8/go.mod h1:5qsM3oLGDND7sDmQGDXHkYfkjYMUX14qsgqmHhwGEk8=
 github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0/go.mod h1:t2tdKJDJF9BV14lnkjHmOQgcvEKgtqs5a1N3LNdJhGE=
+github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
 github.com/bmatcuk/doublestar v1.3.0/go.mod h1:wiQtGV+rzVYxB7WIlirSN++5HPtPlXEo9MEoZQC/PmE=
 github.com/bmatcuk/doublestar v1.3.1 h1:rT8rxDPsavp9G+4ZULzqhhUSaI/OPsTZNG88Z3i0xvY=
 github.com/bmatcuk/doublestar v1.3.1/go.mod h1:wiQtGV+rzVYxB7WIlirSN++5HPtPlXEo9MEoZQC/PmE=
@@ -143,6 +146,8 @@ github.com/gorilla/context v0.0.0-20160226214623-1ea25387ff6f/go.mod h1:kBGZzfjB
 github.com/gorilla/context v1.1.1 h1:AWwleXJkX/nhcU9bZSnZoi3h/qGYqQAGhq6zZe/aQW8=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/csrf v1.6.0/go.mod h1:7tSf8kmjNYr7IWDCYhd3U8Ck34iQ/Yw5CJu7bAkHEGI=
+github.com/gorilla/csrf v1.6.2/go.mod h1:7tSf8kmjNYr7IWDCYhd3U8Ck34iQ/Yw5CJu7bAkHEGI=
+github.com/gorilla/css v1.0.0/go.mod h1:Dn721qIggHpt4+EFCcTLTU/vk5ySda2ReITrtgBl60c=
 github.com/gorilla/handlers v1.4.1/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
 github.com/gorilla/mux v1.6.1/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
@@ -235,6 +240,8 @@ github.com/lib/pq v1.1.1/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.3.0 h1:/qkRGz8zljWiDcFvgpwUpwIAPu3r07TDvs3Rws+o/pU=
 github.com/lib/pq v1.3.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/lithammer/dedent v1.1.0 h1:VNzHMVCBNG1j0fh3OrsFRkVUwStdDArbgBWoPAffktY=
+github.com/lithammer/dedent v1.1.0/go.mod h1:jrXYCQtgg0nJiN+StA2KgR7w6CiQNv9Fd/Z9BP0jIOc=
 github.com/logrusorgru/aurora v0.0.0-20200102142835-e9ef32dff381/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
 github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
 github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
@@ -287,6 +294,10 @@ github.com/rivo/tview v0.0.0-20200219210816-cd38d7432498/go.mod h1:6lkG1x+13OShE
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rjeczalik/notify v0.0.0-20181126183243-629144ba06a1 h1:FLWDC+iIP9BWgYKvWKKtOUZux35LIQNAuIzp/63RQJU=
 github.com/rjeczalik/notify v0.0.0-20181126183243-629144ba06a1/go.mod h1:aErll2f0sUX9PXZnVNyeiObbmTlk5jnMoCa4QEjJeqM=
+github.com/robfig/cron v1.2.0 h1:ZjScXvvxeQ63Dbyxy76Fj3AT3Ut0aKsyd2/tl3DTMuQ=
+github.com/robfig/cron v1.2.0/go.mod h1:JGuDeoQd7Z6yL4zQhZ3OPEVHB7fL6Ka6skscFHfmt2k=
+github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
+github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rs/cors v1.6.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
 github.com/rs/cors v1.7.0 h1:+88SsELBHx5r+hZ8TCkggzSstaWNbDvThkVK8H6f9ik=
@@ -510,6 +521,7 @@ google.golang.org/grpc v1.25.1 h1:wdKvqQk7IttEw92GoRyKG2IDrUIpgpj6H6m81yfeMW0=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -519,6 +531,8 @@ gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/go-playground/validator.v9 v9.29.1/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
 gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
+gopkg.in/mail.v2 v2.3.1 h1:WYFn/oANrAGP2C0dcV6/pbkPzv8yGzqTjPmTeO7qoXk=
+gopkg.in/mail.v2 v2.3.1/go.mod h1:htwXN1Qh09vZJ1NVKxQqHPBaCBbzKhp5GzuJEA4VJWw=
 gopkg.in/square/go-jose.v2 v2.5.1 h1:7odma5RETjNHWJnR32wx8t+Io4djHE1PqxCFx3iiZ2w=
 gopkg.in/square/go-jose.v2 v2.5.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

internal/config/config.go

@@ -5,6 +5,8 @@ import (
 	"io/ioutil"
 	"time"
 
+	"github.com/lithammer/dedent"
+
 	"github.com/pkg/errors"
 	"gitlab.com/wpetit/goweb/logger"
 
@@ -19,6 +21,8 @@ type Config struct {
 	OIDC     OIDCConfig     `yaml:"oidc"`
 	Database DatabaseConfig `yaml:"database"`
 	Auth     AuthConfig     `yaml:"auth"`
+	SMTP     SMTPConfig     `yaml:"smtp"`
+	Task     TaskConfig     `yaml:"task"`
 }
 
 // NewFromFile retrieves the configuration from the given file
@@ -74,6 +78,29 @@ type AuthConfig struct {
 	Rules []string `yaml:"rules" env:"AUTH_RULES"`
 }
 
+type SMTPConfig struct {
+	Host               string `yaml:"host"  env:"SMTP_HOST"`
+	Port               int    `yaml:"port" env:"SMTP_PORT"`
+	UseStartTLS        bool   `yaml:"useStartTLS" env:"SMTP_USE_START_TLS"`
+	User               string `yaml:"user" env:"SMTP_USER"`
+	Password           string `yaml:"password" env:"SMTP_PASSWORD"`
+	InsecureSkipVerify bool   `yaml:"insecureSkipVerify" env:"SMTP_INSECURE_SKIP_VERIFY"`
+	SenderAddress      string `yaml:"senderAddress" env:"SMTP_SENDER_ADDRESS"`
+	SenderName         string `yaml:"senderName" env:"SMTP_SENDER_NAME"`
+}
+
+type TaskConfig struct {
+	Newsletter NewsletterTaskConfig `yaml:"newsletter"`
+}
+
+type NewsletterTaskConfig struct {
+	CronSpec        string        `yaml:"cronSpec"  env:"TASK_NEWSLETTER_CRON_SPEC"`
+	TimeRange       time.Duration `yaml:"timeRange" env:"TASK_NEWSLETTER_TIME_RANGE"`
+	BaseURL         string        `yaml:"baseUrl" env:"TASK_NEWSLETTER_BASE_URL"`
+	ContentTemplate string        `yaml:"contentTemplate" env:"TASK_NEWSLETTER_CONTENT_TEMPLATE"`
+	SubjectTemplate string        `yaml:"subjectTemplate" env:"TASK_NEWSLETTER_SUBJECT_TEMPLATE"`
+}
+
 func NewDumpDefault() *Config {
 	config := NewDefault()
 	return config
@@ -112,6 +139,66 @@ func NewDefault() *Config {
 				"user.Email endsWith 'cadoles.com'",
 			},
 		},
+		SMTP: SMTPConfig{
+			Host:          "localhost",
+			Port:          2525,
+			User:          "",
+			Password:      "",
+			SenderAddress: "noreply@localhost",
+			SenderName:    "noreply",
+		},
+		Task: TaskConfig{
+			Newsletter: NewsletterTaskConfig{
+				CronSpec:  "0 9 * * 1",
+				TimeRange: 24 * 7 * time.Hour,
+				BaseURL:   "http://localhost:8080",
+				ContentTemplate: dedent.Dedent(`
+				{{- $root := . -}}
+				Bonjour {{ .User.Name }},
+				
+				{{ if not .HasEvents -}}
+				Aucun évènement notoire ces derniers jours.
+				{{ else -}}
+				Voici les évènements de ces derniers jours:
+				{{- end}}
+
+				{{- with .ReadyToVote }}
+
+				Dossiers récemment prêts à voter
+				--------------------------------
+				
+				{{range . -}}
+				- "{{ .Title }}" - {{ $root.BaseURL }}/decisions/{{ .ID }} - créé le {{ .CreatedAt.Format "02/01/2006" }}
+				{{ end }}
+				{{- end}}
+
+				{{- with .NewDecisionSupportFiles }}
+
+				Nouveaux dossiers d'aide à la décision
+				--------------------------------------
+				
+				{{range . -}}
+				- "{{ .Title }}" - {{ $root.BaseURL }}/decisions/{{ .ID }} - créé le {{ .CreatedAt.Format "02/01/2006" }}
+				{{ end }}
+				{{- end}}
+				
+				{{- with .NewWorkgroups}}
+
+				Nouveaux groupes de travail
+				---------------------------
+				
+				{{range . -}}
+				- "{{ .Name }}" - {{ $root.BaseURL }}/workgroups/{{ .ID }} - créé le {{ .CreatedAt.Format "02/01/2006" }}
+				{{ end }}
+				{{- end}}
+
+				Bonne semaine,
+
+				Daddy
+				`),
+				SubjectTemplate: `[Daddy] Évènements du {{ .From.Format "02/01/2006" }} au {{ .To.Format "02/01/2006" }}`,
+			},
+		},
 	}
 }
 

internal/mail/mailer.go

@@ -0,0 +1,52 @@
+package mail
+
+const (
+	ContentTypeHTML = "text/html"
+	ContentTypeText = "text/plain"
+)
+
+type Option struct {
+	Host               string
+	Port               int
+	User               string
+	Password           string
+	InsecureSkipVerify bool
+	UseStartTLS        bool
+}
+
+type OptionFunc func(*Option)
+
+type Mailer struct {
+	opt *Option
+}
+
+func WithTLS(useStartTLS, insecureSkipVerify bool) OptionFunc {
+	return func(opt *Option) {
+		opt.UseStartTLS = useStartTLS
+		opt.InsecureSkipVerify = insecureSkipVerify
+	}
+}
+
+func WithServer(host string, port int) OptionFunc {
+	return func(opt *Option) {
+		opt.Host = host
+		opt.Port = port
+	}
+}
+
+func WithCredentials(user, password string) OptionFunc {
+	return func(opt *Option) {
+		opt.User = user
+		opt.Password = password
+	}
+}
+
+func NewMailer(funcs ...OptionFunc) *Mailer {
+	opt := &Option{}
+
+	for _, fn := range funcs {
+		fn(opt)
+	}
+
+	return &Mailer{opt}
+}

internal/mail/provider.go

@@ -0,0 +1,11 @@
+package mail
+
+import "gitlab.com/wpetit/goweb/service"
+
+func ServiceProvider(opts ...OptionFunc) service.Provider {
+	mailer := NewMailer(opts...)
+
+	return func(ctn *service.Container) (interface{}, error) {
+		return mailer, nil
+	}
+}

internal/mail/send.go

@@ -0,0 +1,207 @@
+package mail
+
+import (
+	"crypto/tls"
+	"fmt"
+	"math/rand"
+	"net/mail"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/pkg/errors"
+	gomail "gopkg.in/mail.v2"
+)
+
+var (
+	ErrUnexpectedEmailAddressFormat = errors.New("unexpected email address format")
+)
+
+type SendFunc func(*SendOption)
+
+type SendOption struct {
+	Charset           string
+	AddressHeaders    []AddressHeader
+	Headers           []Header
+	Body              Body
+	AlternativeBodies []Body
+}
+
+type AddressHeader struct {
+	Field   string
+	Address string
+	Name    string
+}
+
+type Header struct {
+	Field  string
+	Values []string
+}
+
+type Body struct {
+	Type        string
+	Content     string
+	PartSetting gomail.PartSetting
+}
+
+func WithCharset(charset string) func(*SendOption) {
+	return func(opt *SendOption) {
+		opt.Charset = charset
+	}
+}
+
+func WithSender(address string, name string) func(*SendOption) {
+	return WithAddressHeader("From", address, name)
+}
+
+func WithSubject(subject string) func(*SendOption) {
+	return WithHeader("Subject", subject)
+}
+
+func WithAddressHeader(field, address, name string) func(*SendOption) {
+	return func(opt *SendOption) {
+		opt.AddressHeaders = append(opt.AddressHeaders, AddressHeader{field, address, name})
+	}
+}
+
+func WithHeader(field string, values ...string) func(*SendOption) {
+	return func(opt *SendOption) {
+		opt.Headers = append(opt.Headers, Header{field, values})
+	}
+}
+
+func WithRecipients(addresses ...string) func(*SendOption) {
+	return WithHeader("To", addresses...)
+}
+
+func WithCopies(addresses ...string) func(*SendOption) {
+	return WithHeader("Cc", addresses...)
+}
+
+func WithInvisibleCopies(addresses ...string) func(*SendOption) {
+	return WithHeader("Cci", addresses...)
+}
+
+func WithBody(contentType string, content string, setting gomail.PartSetting) func(*SendOption) {
+	return func(opt *SendOption) {
+		if setting == nil {
+			setting = gomail.SetPartEncoding(gomail.Unencoded)
+		}
+		opt.Body = Body{contentType, content, setting}
+	}
+}
+
+func WithAlternativeBody(contentType string, content string, setting gomail.PartSetting) func(*SendOption) {
+	return func(opt *SendOption) {
+		if setting == nil {
+			setting = gomail.SetPartEncoding(gomail.Unencoded)
+		}
+		opt.AlternativeBodies = append(opt.AlternativeBodies, Body{contentType, content, setting})
+	}
+}
+
+func (m *Mailer) Send(funcs ...SendFunc) error {
+	opt := &SendOption{
+		Charset: "UTF-8",
+		Body: Body{
+			Type:        "text/plain",
+			Content:     "",
+			PartSetting: gomail.SetPartEncoding(gomail.Unencoded),
+		},
+		AddressHeaders:    make([]AddressHeader, 0),
+		Headers:           make([]Header, 0),
+		AlternativeBodies: make([]Body, 0),
+	}
+
+	for _, f := range funcs {
+		f(opt)
+	}
+
+	conn, err := m.openConnection()
+	if err != nil {
+		return errors.Wrap(err, "could not open connection")
+	}
+
+	defer conn.Close()
+
+	message := gomail.NewMessage(gomail.SetCharset(opt.Charset))
+
+	for _, h := range opt.AddressHeaders {
+		message.SetAddressHeader(h.Field, h.Address, h.Name)
+	}
+
+	for _, h := range opt.Headers {
+		message.SetHeader(h.Field, h.Values...)
+	}
+
+	froms := message.GetHeader("From")
+
+	var sendDomain string
+
+	if len(froms) > 0 {
+		sendDomain, err = extractEmailDomain(froms[0])
+		if err != nil {
+			return err
+		}
+	}
+
+	messageID := generateMessageID(sendDomain)
+	message.SetHeader("Message-Id", messageID)
+
+	message.SetBody(opt.Body.Type, opt.Body.Content, opt.Body.PartSetting)
+
+	for _, b := range opt.AlternativeBodies {
+		message.AddAlternative(b.Type, b.Content, b.PartSetting)
+	}
+
+	if err := gomail.Send(conn, message); err != nil {
+		return errors.Wrap(err, "could not send message")
+	}
+
+	return nil
+}
+
+func (m *Mailer) openConnection() (gomail.SendCloser, error) {
+	dialer := gomail.NewDialer(
+		m.opt.Host,
+		m.opt.Port,
+		m.opt.User,
+		m.opt.Password,
+	)
+
+	if m.opt.InsecureSkipVerify {
+		dialer.TLSConfig = &tls.Config{
+			InsecureSkipVerify: true,
+		}
+	}
+
+	conn, err := dialer.Dial()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not dial smtp server")
+	}
+
+	return conn, nil
+}
+
+func extractEmailDomain(email string) (string, error) {
+	address, err := mail.ParseAddress(email)
+	if err != nil {
+		return "", errors.Wrapf(err, "could not parse email address '%s'", email)
+	}
+
+	addressParts := strings.SplitN(address.Address, "@", 2)
+	if len(addressParts) != 2 { // nolint: gomnd
+		return "", errors.WithStack(ErrUnexpectedEmailAddressFormat)
+	}
+
+	domain := addressParts[1]
+
+	return domain, nil
+}
+
+func generateMessageID(domain string) string {
+	// Based on https://www.jwz.org/doc/mid.html
+	timestamp := strconv.FormatInt(time.Now().UnixNano(), 36)
+	random := strconv.FormatInt(rand.Int63(), 36)
+	return fmt.Sprintf("<%s.%s@%s>", timestamp, random, domain)
+}

internal/mail/service.go

@@ -0,0 +1,33 @@
+package mail
+
+import (
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+const ServiceName service.Name = "mail"
+
+// From retrieves the mail service in the given container
+func From(container *service.Container) (*Mailer, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+
+	srv, ok := service.(*Mailer)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+
+	return srv, nil
+}
+
+// Must retrieves the mail service in the given container or panic otherwise
+func Must(container *service.Container) *Mailer {
+	srv, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+
+	return srv
+}

internal/model/dsf.go

@@ -11,6 +11,13 @@ import (
 
 const ObjectTypeDecisionSupportFile = "dsf"
 
+const (
+	StatusDraft  = "draft"
+	StatusReady  = "ready"
+	StatusVoted  = "voted"
+	StatusClosed = "closed"
+)
+
 type DecisionSupportFile struct {
 	gorm.Model
 	Title        string                 `json:"title"`

internal/model/user_repository.go

@@ -80,6 +80,17 @@ func (r *UserRepository) Find(ctx context.Context, id string) (*User, error) {
 	return user, nil
 }
 
+func (r *UserRepository) All(ctx context.Context) ([]*User, error) {
+	users := make([]*User, 0)
+	query := r.db.Model(&User{})
+
+	if err := query.Find(&users).Error; err != nil {
+		return nil, errs.WithStack(err)
+	}
+
+	return users, nil
+}
+
 func NewUserRepository(db *gorm.DB) *UserRepository {
 	return &UserRepository{db}
 }

internal/task/newsletter.go

@@ -0,0 +1,212 @@
+package task
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"text/template"
+	"time"
+
+	"forge.cadoles.com/Cadoles/daddy/internal/mail"
+	"forge.cadoles.com/Cadoles/daddy/internal/model"
+	"github.com/pkg/errors"
+
+	"forge.cadoles.com/Cadoles/daddy/internal/orm"
+
+	"gitlab.com/wpetit/goweb/middleware/container"
+
+	"gitlab.com/wpetit/goweb/logger"
+)
+
+type Newsletter struct {
+	ctx             context.Context
+	timeRange       time.Duration
+	baseURL         string
+	contentTemplate string
+	subjectTemplate string
+	from            string
+}
+
+func (t *Newsletter) Name() string {
+	return "newsletter"
+}
+
+func (t *Newsletter) Run() {
+	ctx := t.ctx
+
+	logger.Info(ctx, "preparing newsletter", logger.F("timeRange", t.timeRange))
+
+	contentTmpl, err := template.New("").Parse(t.contentTemplate)
+	if err != nil {
+		logger.Error(ctx, "could not parse newsletter content template", logger.E(errors.WithStack(err)))
+
+		return
+	}
+
+	subjectTmpl, err := template.New("").Parse(t.subjectTemplate)
+	if err != nil {
+		logger.Error(ctx, "could not parse newsletter subject template", logger.E(errors.WithStack(err)))
+
+		return
+	}
+
+	ctn := container.Must(ctx)
+	orm := orm.Must(ctn)
+	db := orm.DB()
+	mailSrv := mail.Must(ctn)
+
+	eventRepo := model.NewEventRepository(db)
+
+	to := time.Now()
+	from := to.Add(-t.timeRange)
+
+	events, err := eventRepo.Search(ctx, &model.EventFilter{
+		From: &from,
+		To:   &to,
+	})
+	if err != nil {
+		logger.Error(ctx, "could not search events", logger.E(errors.WithStack(err)))
+
+		return
+	}
+
+	newWorkgroups := make([]*model.Workgroup, 0)
+	newDecisionSupportFiles := make([]*model.DecisionSupportFile, 0)
+	readyToVote := make([]*model.DecisionSupportFile, 0)
+
+	workgroupRepo := model.NewWorkgroupRepository(db)
+	dsfRepo := model.NewDSFRepository(db)
+
+	for _, evt := range events {
+		switch {
+		case evt.Type == model.EventTypeCreated && evt.ObjectType == model.ObjectTypeWorkgroup:
+			workgroup, err := workgroupRepo.Find(ctx, fmt.Sprintf("%d", evt.ObjectID))
+			if err != nil {
+				logger.Error(
+					ctx, "could not find workgroup",
+					logger.E(errors.WithStack(err)),
+					logger.F("id", evt.ObjectID),
+				)
+
+				return
+			}
+
+			newWorkgroups = append(newWorkgroups, workgroup)
+
+		case evt.Type == model.EventTypeCreated && evt.ObjectType == model.ObjectTypeDecisionSupportFile:
+			dsf, err := dsfRepo.Find(ctx, fmt.Sprintf("%d", evt.ObjectID))
+			if err != nil {
+				logger.Error(
+					ctx, "could not find decision support file",
+					logger.E(errors.WithStack(err)),
+					logger.F("id", evt.ObjectID),
+				)
+
+				return
+			}
+
+			newDecisionSupportFiles = append(newDecisionSupportFiles, dsf)
+
+		case evt.Type == model.EventTypeStatusChanged && evt.ObjectType == model.ObjectTypeDecisionSupportFile:
+			dsf, err := dsfRepo.Find(ctx, fmt.Sprintf("%d", evt.ObjectID))
+			if err != nil {
+				logger.Error(
+					ctx, "could not find decision support file",
+					logger.E(errors.WithStack(err)),
+					logger.F("id", evt.ObjectID),
+				)
+
+				return
+			}
+
+			if dsf.Status == model.StatusReady {
+				readyToVote = append(readyToVote, dsf)
+			}
+		}
+	}
+
+	hasEvents := len(newDecisionSupportFiles) > 0 || len(newWorkgroups) > 0
+
+	userRepo := model.NewUserRepository(db)
+
+	users, err := userRepo.All(ctx)
+	if err != nil {
+		logger.Error(ctx, "could not find users", logger.E(errors.WithStack(err)))
+
+		return
+	}
+
+	var (
+		contentBuff bytes.Buffer
+		subjectBuff bytes.Buffer
+	)
+
+	for _, u := range users {
+		tmplData := struct {
+			User                    *model.User
+			NewWorkgroups           []*model.Workgroup
+			NewDecisionSupportFiles []*model.DecisionSupportFile
+			ReadyToVote             []*model.DecisionSupportFile
+			BaseURL                 string
+			From                    time.Time
+			To                      time.Time
+			HasEvents               bool
+		}{
+			User:                    u,
+			BaseURL:                 t.baseURL,
+			NewWorkgroups:           newWorkgroups,
+			NewDecisionSupportFiles: newDecisionSupportFiles,
+			ReadyToVote:             readyToVote,
+			From:                    from.Local(),
+			To:                      to.Local(),
+			HasEvents:               hasEvents,
+		}
+
+		err = contentTmpl.Execute(&contentBuff, tmplData)
+		if err != nil {
+			logger.Error(ctx, "could not execute newsletter content template", logger.E(errors.WithStack(err)))
+
+			return
+		}
+
+		err = subjectTmpl.Execute(&subjectBuff, tmplData)
+		if err != nil {
+			logger.Error(ctx, "could not execute newsletter subject template", logger.E(errors.WithStack(err)))
+
+			return
+		}
+
+		newsletterContent := contentBuff.String()
+		newsletterSubject := subjectBuff.String()
+
+		err := mailSrv.Send(
+			mail.WithRecipients(u.Email),
+			mail.WithSubject(newsletterSubject),
+			mail.WithSender(t.from, ""),
+			mail.WithBody(mail.ContentTypeText, newsletterContent, nil),
+		)
+		if err != nil {
+			logger.Error(
+				ctx, "could not send newsletter",
+				logger.E(errors.WithStack(err)),
+				logger.F("email", u.Email),
+			)
+
+			return
+		}
+
+		contentBuff.Reset()
+		subjectBuff.Reset()
+	}
+}
+
+func NewNewsletter(ctx context.Context, timeRange time.Duration, baseURL, contentTemplate, subjectTemplate, from string) *Newsletter {
+	return &Newsletter{
+		ctx:             ctx,
+		timeRange:       timeRange,
+		baseURL:         baseURL,
+		contentTemplate: contentTemplate,
+		subjectTemplate: subjectTemplate,
+		from:            from,
+	}
+}

internal/task/task.go

@@ -0,0 +1,6 @@
+package task
+
+type Task interface {
+	Name() string
+	Run()
+}