create new type SafeString to sanitise and store unsafe html

src/main.rs

@@ -42,6 +42,7 @@ mod models;
 mod schema;
 mod routes;
 mod utils;
+mod safe_string;
 
 lazy_static! {
     pub static ref BASE_URL: String = env::var("BASE_URL")

src/safe_string.rs

@@ -0,0 +1,103 @@
+use ammonia::clean;
+use serde::{self, Serialize, Deserialize,
+    Serializer, Deserializer, de::Visitor};
+use std::{fmt::{self, Display},
+    borrow::Borrow, io::Write,
+    ops::Deref};
+use diesel::{self, deserialize::Queryable,
+    types::ToSql,
+    sql_types::Text,
+    serialize::{self, Output}};
+
+#[derive(Debug,Clone,AsExpression,FromSqlRow)]
+#[sql_type = "Text"]
+pub struct SafeString{
+    value: String,
+}
+
+impl SafeString{
+pub fn new(value: &str) -> Self {
+    SafeString{
+            value: clean(&value),
+        }
+    }
+    pub fn set(&mut self, value: &str) {
+        self.value = clean(value);
+    }
+    pub fn get(&self) -> &String {
+        &self.value
+    }
+}
+
+impl Serialize for SafeString {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where S: Serializer, {
+        serializer.serialize_str(&self.value)
+    }
+}
+
+struct SafeStringVisitor;
+
+impl<'de> Visitor<'de> for SafeStringVisitor {
+    type Value = SafeString;
+
+    fn expecting(&self, formatter:&mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a string")
+    }
+
+    fn visit_str<E>(self, value: &str) -> Result<SafeString, E>
+    where E: serde::de::Error{
+        Ok(SafeString::new(value))
+    }
+}
+
+impl<'de> Deserialize<'de> for SafeString {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where D: Deserializer<'de>, {
+        Ok(
+            deserializer.deserialize_string(SafeStringVisitor)?
+        )
+    }
+}
+
+impl Queryable<Text, diesel::pg::Pg> for SafeString {
+    type Row = String;
+    fn build(value: Self::Row) -> Self {
+        SafeString::new(&value)
+    }
+}
+
+impl<DB> ToSql<diesel::sql_types::Text, DB> for SafeString
+where
+    DB: diesel::backend::Backend,
+    str: ToSql<diesel::sql_types::Text, DB>, {
+    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
+        str::to_sql(&self.value, out)
+    }
+}
+
+
+impl Borrow<str> for SafeString {
+    fn borrow(&self) -> &str {
+        &self.value
+    }
+}
+
+impl Display for SafeString {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.value)
+    }
+}
+
+impl Deref for SafeString {
+    type Target = str;
+    fn deref(&self) -> &str {
+        &self.value
+    }
+}
+
+impl AsRef<str> for SafeString {
+    fn as_ref(&self) -> &str {
+        &self.value
+    }
+}