2018-09-19 10:48:39 +02:00
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use ammonia::{Builder, UrlRelative};
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2018-11-24 12:44:17 +01:00
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use diesel::{
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self,
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deserialize::Queryable,
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serialize::{self, Output},
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2018-06-11 11:43:27 +02:00
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sql_types::Text,
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2018-11-24 12:44:17 +01:00
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types::ToSql,
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};
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use serde::{self, de::Visitor, Deserialize, Deserializer, Serialize, Serializer};
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use std::{
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borrow::{Borrow, Cow},
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fmt::{self, Display},
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io::Write,
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iter,
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ops::Deref,
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};
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2018-06-11 11:43:27 +02:00
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2018-09-19 10:48:39 +02:00
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lazy_static! {
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static ref CLEAN: Builder<'static> = {
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let mut b = Builder::new();
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b.add_generic_attributes(iter::once("id"))
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2019-04-06 19:20:33 +02:00
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.add_tags(&["iframe", "video", "audio", "label", "input"])
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2018-09-19 10:48:39 +02:00
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.id_prefix(Some("postcontent-"))
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.url_relative(UrlRelative::Custom(Box::new(url_add_prefix)))
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2018-11-24 12:44:17 +01:00
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.add_tag_attributes(
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"iframe",
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2019-03-20 17:56:17 +01:00
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["width", "height", "src", "frameborder"].iter().cloned(),
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2019-03-06 14:11:36 +01:00
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)
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2019-03-20 17:56:17 +01:00
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.add_tag_attributes("video", ["src", "title", "controls"].iter())
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2019-04-06 19:20:33 +02:00
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.add_tag_attributes("audio", ["src", "title", "controls"].iter())
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.add_tag_attributes("label", ["for"].iter())
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.add_tag_attributes("input", ["type", "checked"].iter())
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.add_allowed_classes("input", ["cw-checkbox"].iter())
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2019-11-20 16:16:38 +01:00
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// Related to https://github.com/Plume-org/Plume/issues/637
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.add_allowed_classes("sup", ["footnote-reference", "footnote-definition-label"].iter())
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.add_allowed_classes("div", ["footnote-definition"].iter())
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2019-04-06 19:20:33 +02:00
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.add_allowed_classes("span", ["cw-container", "cw-text"].iter())
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.attribute_filter(|elem, att, val| match (elem, att) {
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("input", "type") => Some("checkbox".into()),
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("input", "checked") => Some("checked".into()),
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("label", "for") => {
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if val.starts_with("postcontent-cw-") {
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Some(val.into())
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} else {
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None
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}
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}
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_ => Some(val.into()),
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});
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2018-09-19 10:48:39 +02:00
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b
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};
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}
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fn url_add_prefix(url: &str) -> Option<Cow<str>> {
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2018-11-24 12:44:17 +01:00
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if url.starts_with('#') && !url.starts_with("#postcontent-") {
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//if start with an #
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let mut new_url = "#postcontent-".to_owned(); //change to valid id
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2018-09-19 10:48:39 +02:00
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new_url.push_str(&url[1..]);
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Some(Cow::Owned(new_url))
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} else {
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Some(Cow::Borrowed(url))
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}
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}
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2018-11-24 12:44:17 +01:00
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#[derive(Debug, Clone, PartialEq, AsExpression, FromSqlRow, Default)]
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2018-06-11 11:43:27 +02:00
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#[sql_type = "Text"]
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2018-11-24 12:44:17 +01:00
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pub struct SafeString {
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2018-06-11 11:43:27 +02:00
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value: String,
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}
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2018-11-24 12:44:17 +01:00
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impl SafeString {
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pub fn new(value: &str) -> Self {
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SafeString {
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2018-09-19 10:48:39 +02:00
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value: CLEAN.clean(&value).to_string(),
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2018-06-11 11:43:27 +02:00
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}
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}
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2019-03-06 14:11:36 +01:00
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/// Creates a new `SafeString`, but without escaping the given value.
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///
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/// Only use when you are sure you can trust the input (when the HTML
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/// is entirely generated by Plume, not depending on user-inputed data).
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/// Prefer `SafeString::new` as much as possible.
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pub fn trusted(value: impl AsRef<str>) -> Self {
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SafeString {
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2019-03-20 17:56:17 +01:00
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value: value.as_ref().to_string(),
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2019-03-06 14:11:36 +01:00
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}
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}
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2018-06-11 11:43:27 +02:00
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pub fn set(&mut self, value: &str) {
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2018-09-19 10:48:39 +02:00
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self.value = CLEAN.clean(value).to_string();
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2018-06-11 11:43:27 +02:00
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}
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pub fn get(&self) -> &String {
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&self.value
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}
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}
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impl Serialize for SafeString {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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2018-11-24 12:44:17 +01:00
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where
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S: Serializer,
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{
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2018-06-11 11:43:27 +02:00
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serializer.serialize_str(&self.value)
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}
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}
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struct SafeStringVisitor;
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impl<'de> Visitor<'de> for SafeStringVisitor {
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type Value = SafeString;
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2018-11-24 12:44:17 +01:00
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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2018-06-11 11:43:27 +02:00
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formatter.write_str("a string")
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}
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fn visit_str<E>(self, value: &str) -> Result<SafeString, E>
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2018-11-24 12:44:17 +01:00
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where
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E: serde::de::Error,
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{
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2018-06-11 11:43:27 +02:00
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Ok(SafeString::new(value))
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}
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}
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impl<'de> Deserialize<'de> for SafeString {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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2018-11-24 12:44:17 +01:00
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where
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D: Deserializer<'de>,
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{
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Ok(deserializer.deserialize_string(SafeStringVisitor)?)
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2018-06-11 11:43:27 +02:00
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}
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}
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2018-10-08 19:58:15 +02:00
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#[cfg(all(feature = "postgres", not(feature = "sqlite")))]
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2018-06-11 11:43:27 +02:00
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impl Queryable<Text, diesel::pg::Pg> for SafeString {
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type Row = String;
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fn build(value: Self::Row) -> Self {
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SafeString::new(&value)
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}
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}
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2018-09-27 23:06:40 +02:00
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2018-10-08 19:58:15 +02:00
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#[cfg(all(feature = "sqlite", not(feature = "postgres")))]
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2018-09-27 23:06:40 +02:00
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impl Queryable<Text, diesel::sqlite::Sqlite> for SafeString {
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type Row = String;
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fn build(value: Self::Row) -> Self {
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SafeString::new(&value)
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}
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}
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2018-10-08 19:58:15 +02:00
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2018-06-11 11:43:27 +02:00
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impl<DB> ToSql<diesel::sql_types::Text, DB> for SafeString
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where
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DB: diesel::backend::Backend,
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2018-11-24 12:44:17 +01:00
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str: ToSql<diesel::sql_types::Text, DB>,
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{
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2018-06-11 11:43:27 +02:00
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fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
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str::to_sql(&self.value, out)
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}
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}
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impl Borrow<str> for SafeString {
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fn borrow(&self) -> &str {
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&self.value
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}
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}
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impl Display for SafeString {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.value)
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}
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}
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impl Deref for SafeString {
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type Target = str;
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fn deref(&self) -> &str {
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&self.value
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}
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}
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impl AsRef<str> for SafeString {
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fn as_ref(&self) -> &str {
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&self.value
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}
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}
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2018-09-14 18:26:42 +02:00
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use rocket::http::RawStr;
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2018-11-24 12:44:17 +01:00
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use rocket::request::FromFormValue;
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2018-09-14 18:26:42 +02:00
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impl<'v> FromFormValue<'v> for SafeString {
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type Error = &'v RawStr;
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fn from_form_value(form_value: &'v RawStr) -> Result<SafeString, &'v RawStr> {
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let val = String::from_form_value(form_value)?;
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2018-09-14 19:50:59 +02:00
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Ok(SafeString::new(&val))
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2018-09-14 18:26:42 +02:00
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}
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}
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