melib/addressbook/vcard: Parse vCards with just LF instead of CRLF line endings

According to the vcard RFC
https://datatracker.ietf.org/doc/html/rfc6350#section-3.2 all lines must
end with CRLF (\r\n or 0x0d 0x0a)

Some VCard sources use only newline, which, while spec violating is easy
to recover from. So parse them as if they are correct.

Closes #121

melib/src/addressbook/vcard.rs

@@ -45,8 +45,12 @@ impl VCardVersion for VCardVersion3 {}
 
 pub struct CardDeserializer;
 
-static HEADER: &str = "BEGIN:VCARD\r\n"; //VERSION:4.0\r\n";
-static FOOTER: &str = "END:VCARD\r\n";
+const HEADER_CRLF: &str = "BEGIN:VCARD\r\n"; //VERSION:4.0\r\n";
+const FOOTER_CRLF: &str = "END:VCARD\r\n";
+const HEADER_LF: &str = "BEGIN:VCARD\n"; //VERSION:4.0\n";
+const FOOTER_LF: &str = "END:VCARD\n";
+const HEADER: &str = "BEGIN:VCARD"; //VERSION:4.0";
+const FOOTER: &str = "END:VCARD";
 
 #[derive(Debug)]
 pub struct VCard<T: VCardVersion>(
@@ -72,10 +76,14 @@ pub struct ContentLine {
 
 impl CardDeserializer {
     pub fn from_str(mut input: &str) -> Result<VCard<impl VCardVersion>> {
-        input = if !input.starts_with(HEADER) || !input.ends_with(FOOTER) {
+        input = if (!input.starts_with(HEADER_CRLF) || !input.ends_with(FOOTER_CRLF))
+            && (!input.starts_with(HEADER_LF) || !input.ends_with(FOOTER_LF))
+        {
             return Err(MeliError::new(format!("Error while parsing vcard: input does not start or end with correct header and footer. input is:\n{:?}", input)));
+        } else if input.starts_with(HEADER_CRLF) {
+            &input[HEADER_CRLF.len()..input.len() - FOOTER_CRLF.len()]
         } else {
-            &input[HEADER.len()..input.len() - FOOTER.len()]
+            &input[HEADER_LF.len()..input.len() - FOOTER_LF.len()]
         };
 
         let mut ret = HashMap::default();
@@ -308,4 +316,6 @@ pub fn load_cards(p: &std::path::Path) -> Result<Vec<Card>> {
 fn test_card() {
     let j = "BEGIN:VCARD\r\nVERSION:4.0\r\nN:Gump;Forrest;;Mr.;\r\nFN:Forrest Gump\r\nORG:Bubba Gump Shrimp Co.\r\nTITLE:Shrimp Man\r\nPHOTO;MEDIATYPE=image/gif:http://www.example.com/dir_photos/my_photo.gif\r\nTEL;TYPE=work,voice;VALUE=uri:tel:+1-111-555-1212\r\nTEL;TYPE=home,voice;VALUE=uri:tel:+1-404-555-1212\r\nADR;TYPE=WORK;PREF=1;LABEL=\"100 Waters Edge\\nBaytown\\, LA 30314\\nUnited States of America\":;;100 Waters Edge;Baytown;LA;30314;United States of America\r\nADR;TYPE=HOME;LABEL=\"42 Plantation St.\\nBaytown\\, LA 30314\\nUnited States of America\":;;42 Plantation St.;Baytown;LA;30314;United States of America\r\nEMAIL:forrestgump@example.com\r\nREV:20080424T195243Z\r\nx-qq:21588891\r\nEND:VCARD\r\n";
     println!("results = {:#?}", CardDeserializer::from_str(j).unwrap());
+    let j = "BEGIN:VCARD\nVERSION:4.0\nN:Gump;Forrest;;Mr.;\nFN:Forrest Gump\nORG:Bubba Gump Shrimp Co.\nTITLE:Shrimp Man\nPHOTO;MEDIATYPE=image/gif:http://www.example.com/dir_photos/my_photo.gif\nTEL;TYPE=work,voice;VALUE=uri:tel:+1-111-555-1212\nTEL;TYPE=home,voice;VALUE=uri:tel:+1-404-555-1212\nADR;TYPE=WORK;PREF=1;LABEL=\"100 Waters Edge\\nBaytown\\, LA 30314\\nUnited States of America\":;;100 Waters Edge;Baytown;LA;30314;United States of America\nADR;TYPE=HOME;LABEL=\"42 Plantation St.\\nBaytown\\, LA 30314\\nUnited States of America\":;;42 Plantation St.;Baytown;LA;30314;United States of America\nEMAIL:forrestgump@example.com\nREV:20080424T195243Z\nx-qq:21588891\nEND:VCARD\n";
+    println!("results = {:#?}", CardDeserializer::from_str(j).unwrap());
 }