[feature] Allow users to set custom css for their profiles + threads (#808)

* add custom css account property + db func to fetch

* allow account to get/set custom css

* serve custom css for an account

* go fmt

* use monospace for customcss, add link

* add custom css to account cache

* fix broken field

* add custom css docs to user guide

* add `accounts-allow-custom-css` config flag

* add allow custom css to /api/v1/instance response

* only show/set custom css if allowed to do so

* only set/serve custom account css if enabled

* update swagger docs

* chain promise

* make bool a bit clearer

* use cache for GetAccountCustomCSSByUsername

internal/config/config.go

@@ -73,6 +73,7 @@ type Configuration struct {
 	AccountsRegistrationOpen bool `name:"accounts-registration-open" usage:"Allow anyone to submit an account signup request. If false, server will be invite-only."`
 	AccountsApprovalRequired bool `name:"accounts-approval-required" usage:"Do account signups require approval by an admin or moderator before user can log in? If false, new registrations will be automatically approved."`
 	AccountsReasonRequired   bool `name:"accounts-reason-required" usage:"Do new account signups require a reason to be submitted on registration?"`
+	AccountsAllowCustomCSS   bool `name:"accounts-allow-custom-css" usage:"Allow accounts to enable custom CSS for their profile pages and statuses."`
 
 	MediaImageMaxSize        int `name:"media-image-max-size" usage:"Max size of accepted images in bytes"`
 	MediaVideoMaxSize        int `name:"media-video-max-size" usage:"Max size of accepted videos in bytes"`

internal/config/defaults.go

@@ -52,6 +52,7 @@ var Defaults = Configuration{
 	AccountsRegistrationOpen: true,
 	AccountsApprovalRequired: true,
 	AccountsReasonRequired:   true,
+	AccountsAllowCustomCSS:   false,
 
 	MediaImageMaxSize:        10485760, // 10mb
 	MediaVideoMaxSize:        41943040, // 40mb

internal/config/flags.go

@@ -68,6 +68,7 @@ func AddServerFlags(cmd *cobra.Command) {
 		cmd.Flags().Bool(AccountsRegistrationOpenFlag(), cfg.AccountsRegistrationOpen, fieldtag("AccountsRegistrationOpen", "usage"))
 		cmd.Flags().Bool(AccountsApprovalRequiredFlag(), cfg.AccountsApprovalRequired, fieldtag("AccountsApprovalRequired", "usage"))
 		cmd.Flags().Bool(AccountsReasonRequiredFlag(), cfg.AccountsReasonRequired, fieldtag("AccountsReasonRequired", "usage"))
+		cmd.Flags().Bool(AccountsAllowCustomCSSFlag(), cfg.AccountsAllowCustomCSS, fieldtag("AccountsAllowCustomCSS", "usage"))
 
 		// Media
 		cmd.Flags().Int(MediaImageMaxSizeFlag(), cfg.MediaImageMaxSize, fieldtag("MediaImageMaxSize", "usage"))

internal/config/helpers.gen.go

@@ -668,6 +668,31 @@ func GetAccountsReasonRequired() bool { return global.GetAccountsReasonRequired(
 // SetAccountsReasonRequired safely sets the value for global configuration 'AccountsReasonRequired' field
 func SetAccountsReasonRequired(v bool) { global.SetAccountsReasonRequired(v) }
 
+// GetAccountsAllowCustomCSS safely fetches the Configuration value for state's 'AccountsAllowCustomCSS' field
+func (st *ConfigState) GetAccountsAllowCustomCSS() (v bool) {
+	st.mutex.Lock()
+	v = st.config.AccountsAllowCustomCSS
+	st.mutex.Unlock()
+	return
+}
+
+// SetAccountsAllowCustomCSS safely sets the Configuration value for state's 'AccountsAllowCustomCSS' field
+func (st *ConfigState) SetAccountsAllowCustomCSS(v bool) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.AccountsAllowCustomCSS = v
+	st.reloadToViper()
+}
+
+// AccountsAllowCustomCSSFlag returns the flag name for the 'AccountsAllowCustomCSS' field
+func AccountsAllowCustomCSSFlag() string { return "accounts-allow-custom-css" }
+
+// GetAccountsAllowCustomCSS safely fetches the value for global configuration 'AccountsAllowCustomCSS' field
+func GetAccountsAllowCustomCSS() bool { return global.GetAccountsAllowCustomCSS() }
+
+// SetAccountsAllowCustomCSS safely sets the value for global configuration 'AccountsAllowCustomCSS' field
+func SetAccountsAllowCustomCSS(v bool) { global.SetAccountsAllowCustomCSS(v) }
+
 // GetMediaImageMaxSize safely fetches the Configuration value for state's 'MediaImageMaxSize' field
 func (st *ConfigState) GetMediaImageMaxSize() (v int) {
 	st.mutex.Lock()