Broke out settings and fixed a bug with the dns resolver not being persisted

src/settings.rs

@@ -0,0 +1,49 @@
+use serde::{Deserialize,Serialize};
+/* Response format */
+
+#[derive(Deserialize, Serialize, Clone, Copy)]
+pub enum ResponseFormat {
+	#[serde(rename="text/plain", alias="text")]
+	TextPlain,
+	#[serde(rename="text/html", alias="html")]
+	TextHtml,
+	#[serde(rename="application/json", alias="json")]
+	ApplicationJson,
+}
+
+impl ToString for ResponseFormat {
+	fn to_string(&self) -> String {
+		match self {
+			ResponseFormat::TextPlain => "text/plain",
+			ResponseFormat::TextHtml => "text/html",
+			ResponseFormat::ApplicationJson => "application/json",
+		}.to_string()
+	}
+}
+
+impl ResponseFormat {
+	pub fn to_file_extension(&self) -> String {
+		match self {
+			ResponseFormat::TextPlain => ".txt",
+			ResponseFormat::TextHtml => ".html",
+			ResponseFormat::ApplicationJson => ".json",
+		}.to_string()
+	}
+}
+
+/* Query and Template Settings */
+
+#[derive(Deserialize, Serialize, Clone)]
+pub struct QuerySettings {
+	pub format: ResponseFormat,
+	pub lang: String,
+	pub available_dns_resolvers: Vec<Selectable>,
+	pub dns_resolver_id: String,
+}
+
+#[derive(Deserialize, Serialize, Clone)]
+pub struct Selectable {
+	pub id: String,
+	pub name: String,
+}
+