Support color customization from the admin (#2338)

* Add user-customizable theming. Closes #1915

* Prettified Code!

* Add user-customizable theming. Closes #1915

* Add explicit color for page content background

* Prettified Code!

Co-authored-by: gabek <gabek@users.noreply.github.com>

core/data/config.go

@@ -67,6 +67,7 @@ const (
 	hasConfiguredInitialNotificationsKey = "has_configured_initial_notifications"
 	hideViewerCountKey                   = "hide_viewer_count"
 	customOfflineMessageKey              = "custom_offline_message"
+	customColorVariableValuesKey         = "custom_color_variable_values"
 )
 
 // GetExtraPageBodyContent will return the user-supplied body content.
@@ -932,3 +933,14 @@ func GetCustomOfflineMessage() string {
 func SetCustomOfflineMessage(message string) error {
 	return _datastore.SetString(customOfflineMessageKey, message)
 }
+
+// SetCustomColorVariableValues sets CSS variable names and values.
+func SetCustomColorVariableValues(variables map[string]string) error {
+	return _datastore.SetStringMap(customColorVariableValuesKey, variables)
+}
+
+// GetCustomColorVariableValues gets CSS variable names and values.
+func GetCustomColorVariableValues() map[string]string {
+	values, _ := _datastore.GetStringMap(customColorVariableValuesKey)
+	return values
+}

core/data/configEntry.go

@@ -19,6 +19,13 @@ func (c *ConfigEntry) getStringSlice() ([]string, error) {
 	return result, err
 }
 
+func (c *ConfigEntry) getStringMap() (map[string]string, error) {
+	decoder := c.getDecoder()
+	var result map[string]string
+	err := decoder.Decode(&result)
+	return result, err
+}
+
 func (c *ConfigEntry) getString() (string, error) {
 	decoder := c.getDecoder()
 	var result string

core/data/data_test.go

@@ -110,6 +110,40 @@ func TestCustomType(t *testing.T) {
 	}
 }
 
+func TestStringMap(t *testing.T) {
+	const testKey = "test string map key"
+
+	testMap := map[string]string{
+		"test string 1": "test string 2",
+		"test string 3": "test string 4",
+	}
+
+	// Save config entry to the database
+	if err := _datastore.Save(ConfigEntry{testKey, &testMap}); err != nil {
+		t.Error(err)
+	}
+
+	// Get the config entry from the database
+	entryResult, err := _datastore.Get(testKey)
+	if err != nil {
+		t.Error(err)
+	}
+
+	testResult, err := entryResult.getStringMap()
+	if err != nil {
+		t.Error(err)
+	}
+
+	fmt.Printf("%+v", testResult)
+
+	if testResult["test string 1"] != testMap["test string 1"] {
+		t.Error("expected", testMap["test string 1"], "but test returned", testResult["test string 1"])
+	}
+	if testResult["test string 3"] != testMap["test string 3"] {
+		t.Error("expected", testMap["test string 3"], "but test returned", testResult["test string 3"])
+	}
+}
+
 // Custom type for testing
 type TestStruct struct {
 	Test            string

core/data/types.go

@@ -59,3 +59,18 @@ func (ds *Datastore) SetBool(key string, value bool) error {
 	configEntry := ConfigEntry{key, value}
 	return ds.Save(configEntry)
 }
+
+// GetStringMap will return the string map value for a key.
+func (ds *Datastore) GetStringMap(key string) (map[string]string, error) {
+	configEntry, err := ds.Get(key)
+	if err != nil {
+		return map[string]string{}, err
+	}
+	return configEntry.getStringMap()
+}
+
+// SetStringMap will set the string map value for a key.
+func (ds *Datastore) SetStringMap(key string, value map[string]string) error {
+	configEntry := ConfigEntry{key, value}
+	return ds.Save(configEntry)
+}