[feature] Email notifications for new / closed moderation reports (#1628)

* start fiddling about with email sending to allow multiple recipients

* do some fiddling

* notifs working

* notify on closed report

* finishing up

* envparsing

* use strings.ContainsAny

4 files changed, 38 insertions, 10 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index 21c1ca470..a1e00ea8d 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -126,11 +126,12 @@ type Configuration struct {
 	OIDCLinkExisting     bool     `name:"oidc-link-existing" usage:"link existing user accounts to OIDC logins based on the stored email value"`
 	OIDCAdminGroups      []string `name:"oidc-admin-groups" usage:"Membership of one of the listed groups makes someone a GtS admin"`
 
-	SMTPHost     string `name:"smtp-host" usage:"Host of the smtp server. Eg., 'smtp.eu.mailgun.org'"`
-	SMTPPort     int    `name:"smtp-port" usage:"Port of the smtp server. Eg., 587"`
-	SMTPUsername string `name:"smtp-username" usage:"Username to authenticate with the smtp server as. Eg., 'postmaster@mail.example.org'"`
-	SMTPPassword string `name:"smtp-password" usage:"Password to pass to the smtp server."`
-	SMTPFrom     string `name:"smtp-from" usage:"Address to use as the 'from' field of the email. Eg., 'gotosocial@example.org'"`
+	SMTPHost               string `name:"smtp-host" usage:"Host of the smtp server. Eg., 'smtp.eu.mailgun.org'"`
+	SMTPPort               int    `name:"smtp-port" usage:"Port of the smtp server. Eg., 587"`
+	SMTPUsername           string `name:"smtp-username" usage:"Username to authenticate with the smtp server as. Eg., 'postmaster@mail.example.org'"`
+	SMTPPassword           string `name:"smtp-password" usage:"Password to pass to the smtp server."`
+	SMTPFrom               string `name:"smtp-from" usage:"Address to use as the 'from' field of the email. Eg., 'gotosocial@example.org'"`
+	SMTPDiscloseRecipients bool   `name:"smtp-disclose-recipients" usage:"If true, email notifications sent to multiple recipients will be To'd to every recipient at once. If false, recipients will not be disclosed"`
 
 	SyslogEnabled  bool   `name:"syslog-enabled" usage:"Enable the syslog logging hook. Logs will be mirrored to the configured destination."`
 	SyslogProtocol string `name:"syslog-protocol" usage:"Protocol to use when directing logs to syslog. Leave empty to connect to local syslog."`
diff --git a/internal/config/defaults.go b/internal/config/defaults.go
index b687b43f1..17cc71086 100644
--- a/internal/config/defaults.go
+++ b/internal/config/defaults.go
@@ -102,11 +102,12 @@ var Defaults = Configuration{
 	OIDCScopes:           []string{oidc.ScopeOpenID, "profile", "email", "groups"},
 	OIDCLinkExisting:     false,
 
-	SMTPHost:     "",
-	SMTPPort:     0,
-	SMTPUsername: "",
-	SMTPPassword: "",
-	SMTPFrom:     "GoToSocial",
+	SMTPHost:               "",
+	SMTPPort:               0,
+	SMTPUsername:           "",
+	SMTPPassword:           "",
+	SMTPFrom:               "GoToSocial",
+	SMTPDiscloseRecipients: false,
 
 	SyslogEnabled:  false,
 	SyslogProtocol: "udp",
diff --git a/internal/config/flags.go b/internal/config/flags.go
index 09e927785..e9925ded0 100644
--- a/internal/config/flags.go
+++ b/internal/config/flags.go
@@ -132,6 +132,7 @@ func (s *ConfigState) AddServerFlags(cmd *cobra.Command) {
 		cmd.Flags().String(SMTPUsernameFlag(), cfg.SMTPUsername, fieldtag("SMTPUsername", "usage"))
 		cmd.Flags().String(SMTPPasswordFlag(), cfg.SMTPPassword, fieldtag("SMTPPassword", "usage"))
 		cmd.Flags().String(SMTPFromFlag(), cfg.SMTPFrom, fieldtag("SMTPFrom", "usage"))
+		cmd.Flags().Bool(SMTPDiscloseRecipientsFlag(), cfg.SMTPDiscloseRecipients, fieldtag("SMTPDiscloseRecipients", "usage"))
 
 		// Syslog
 		cmd.Flags().Bool(SyslogEnabledFlag(), cfg.SyslogEnabled, fieldtag("SyslogEnabled", "usage"))
diff --git a/internal/config/helpers.gen.go b/internal/config/helpers.gen.go
index 53553d851..6fc195ad0 100644
--- a/internal/config/helpers.gen.go
+++ b/internal/config/helpers.gen.go
@@ -1924,6 +1924,31 @@ func GetSMTPFrom() string { return global.GetSMTPFrom() }
 // SetSMTPFrom safely sets the value for global configuration 'SMTPFrom' field
 func SetSMTPFrom(v string) { global.SetSMTPFrom(v) }
 
+// GetSMTPDiscloseRecipients safely fetches the Configuration value for state's 'SMTPDiscloseRecipients' field
+func (st *ConfigState) GetSMTPDiscloseRecipients() (v bool) {
+	st.mutex.Lock()
+	v = st.config.SMTPDiscloseRecipients
+	st.mutex.Unlock()
+	return
+}
+
+// SetSMTPDiscloseRecipients safely sets the Configuration value for state's 'SMTPDiscloseRecipients' field
+func (st *ConfigState) SetSMTPDiscloseRecipients(v bool) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.SMTPDiscloseRecipients = v
+	st.reloadToViper()
+}
+
+// SMTPDiscloseRecipientsFlag returns the flag name for the 'SMTPDiscloseRecipients' field
+func SMTPDiscloseRecipientsFlag() string { return "smtp-disclose-recipients" }
+
+// GetSMTPDiscloseRecipients safely fetches the value for global configuration 'SMTPDiscloseRecipients' field
+func GetSMTPDiscloseRecipients() bool { return global.GetSMTPDiscloseRecipients() }
+
+// SetSMTPDiscloseRecipients safely sets the value for global configuration 'SMTPDiscloseRecipients' field
+func SetSMTPDiscloseRecipients(v bool) { global.SetSMTPDiscloseRecipients(v) }
+
 // GetSyslogEnabled safely fetches the Configuration value for state's 'SyslogEnabled' field
 func (st *ConfigState) GetSyslogEnabled() (v bool) {
 	st.mutex.Lock()