System Console: Email notification content setting (#7122)

* PLT-7195: Added new config option, new license feature, and config UI to system console. Still need to implement behaviour change in email batching code

* PLT-7195: Modified batch emails to respect email notification content type setting

* PLT-7195: Tweaking the colours a bit

* PLT-7195: Added support for email notification content type setting in immediate (non-batched) notification messages. Attempted to clean up the code somewhat. Unit tests coming in a future commit

* PLT-7195: Added unit tests for non-batched emails

* Checked license when applying email content settings

* Changed return type of getFormattedPostTime

model/config.go

@@ -66,6 +66,9 @@ const (
 	EMAIL_BATCHING_BUFFER_SIZE = 256
 	EMAIL_BATCHING_INTERVAL    = 30
 
+	EMAIL_NOTIFICATION_CONTENTS_FULL    = "full"
+	EMAIL_NOTIFICATION_CONTENTS_GENERIC = "generic"
+
 	SITENAME_MAX_LENGTH = 30
 
 	SERVICE_SETTINGS_DEFAULT_SITE_URL        = ""
@@ -284,6 +287,7 @@ type EmailSettings struct {
 	EmailBatchingBufferSize           *int
 	EmailBatchingInterval             *int
 	SkipServerCertificateVerification *bool
+	EmailNotificationContentsType     *string
 }
 
 type RateLimitSettings struct {
@@ -819,6 +823,11 @@ func (o *Config) SetDefaults() {
 		*o.EmailSettings.SkipServerCertificateVerification = false
 	}
 
+	if o.EmailSettings.EmailNotificationContentsType == nil {
+		o.EmailSettings.EmailNotificationContentsType = new(string)
+		*o.EmailSettings.EmailNotificationContentsType = EMAIL_NOTIFICATION_CONTENTS_FULL
+	}
+
 	if !IsSafeLink(o.SupportSettings.TermsOfServiceLink) {
 		*o.SupportSettings.TermsOfServiceLink = SUPPORT_SETTINGS_DEFAULT_TERMS_OF_SERVICE_LINK
 	}
@@ -1550,6 +1559,10 @@ func (o *Config) IsValid() *AppError {
 		return NewLocAppError("Config.IsValid", "model.config.is_valid.email_batching_interval.app_error", nil, "")
 	}
 
+	if !(*o.EmailSettings.EmailNotificationContentsType == EMAIL_NOTIFICATION_CONTENTS_FULL || *o.EmailSettings.EmailNotificationContentsType == EMAIL_NOTIFICATION_CONTENTS_GENERIC) {
+		return NewLocAppError("Config.IsValid", "model.config.is_valid.email_notification_contents_type.app_error", nil, "")
+	}
+
 	if o.RateLimitSettings.MemoryStoreSize <= 0 {
 		return NewLocAppError("Config.IsValid", "model.config.is_valid.rate_mem.app_error", nil, "")
 	}