linkify URLs in plaintext emails.

server/src/lib.rs

@@ -3,6 +3,7 @@ pub mod graphql;
 pub mod nm;
 
 use css_inline::{CSSInliner, InlineError, InlineOptions};
+use linkify::{LinkFinder, LinkKind};
 use log::error;
 use lol_html::{element, errors::RewritingError, rewrite_str, RewriteStrSettings};
 use maplit::{hashmap, hashset};
@@ -16,6 +17,22 @@ pub enum SanitizeError {
     InlineError(#[from] InlineError),
 }
 
+pub fn linkify_html(text: &str) -> String {
+    let finder = LinkFinder::new();
+    let mut parts = Vec::new();
+    for span in finder.spans(text) {
+        // TODO(wathiede): use Cow<str>?
+        match span.kind() {
+            // Text as-is
+            None => parts.push(span.as_str().to_string()),
+            // Wrap in anchor tag
+            Some(LinkKind::Url) => parts.push(format!(r#"<a href="{0}">{0}</a>"#, span.as_str())),
+            _ => todo!("unhandled kind: {:?}", span.kind().unwrap()),
+        }
+    }
+    parts.join("")
+}
+
 pub fn sanitize_html(html: &str) -> Result<String, SanitizeError> {
     let element_content_handlers = vec![
         // Open links in new tab
@@ -204,8 +221,6 @@ pub fn sanitize_html(html: &str) -> Result<String, SanitizeError> {
     //let clean_html = inlined_html;
 
     Ok(rewrite_str(
-        // TODO(wathiede): replace ammonia with more lol-html rules.
-        // &ammonia::clean(&html),
         &clean_html,
         RewriteStrSettings {
             element_content_handlers,