Normalize links and images based on post's URL

server/src/nm.rs

@@ -10,6 +10,7 @@ use log::{error, info, warn};
 use mailparse::{parse_mail, MailHeader, MailHeaderMap, ParsedMail};
 use memmap::MmapOptions;
 use notmuch::Notmuch;
+use url::Url;
 
 use crate::{
     error::ServerError,
@@ -178,6 +179,7 @@ pub async fn thread(
             .get_first_value("date")
             .and_then(|d| mailparse::dateparse(&d).ok());
         let cid_prefix = shared::urls::cid_prefix(None, &id);
+        let base_url = Url::parse("https://there-should-be-no-relative-urls-in-email").unwrap();
         let body = match extract_body(&m, &id)? {
             Body::PlainText(PlainText { text, content_tree }) => {
                 let text = if text.len() > MAX_RAW_MESSAGE_SIZE {
@@ -196,7 +198,11 @@ pub async fn thread(
                         // Trim newlines to prevent excessive white space at the beginning/end of
                         // presenation. Leave tabs and spaces incase plain text attempts to center a
                         // header on the first line.
-                        sanitize_html(&linkify_html(&text.trim_matches('\n')), &cid_prefix)?
+                        sanitize_html(
+                            &linkify_html(&text.trim_matches('\n')),
+                            &cid_prefix,
+                            &base_url
+                        )?
                     ),
                     content_tree: if debug_content_tree {
                         render_content_type_tree(&m)
@@ -206,7 +212,7 @@ pub async fn thread(
                 })
             }
             Body::Html(Html { html, content_tree }) => Body::Html(Html {
-                html: sanitize_html(&html, &cid_prefix)?,
+                html: sanitize_html(&html, &cid_prefix, &base_url)?,
                 content_tree: if debug_content_tree {
                     render_content_type_tree(&m)
                 } else {