fix escaping

examples/custom_property_parsed.rs

@@ -5,7 +5,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let event = Event::new()
         .summary("test event")
         .append_property(
-            "TEST;IMPORTANCE=very;DUE=tomorrow:FOOBAR\n"
+            r#"TEST;IMPORTANCE=very;DUE=tomorrow:FOOBAR;COMPLEX=\n"#
                 .parse::<Property>()
                 .unwrap(),
         )

examples/full_circle.rs

@@ -6,15 +6,18 @@ use icalendar::*;
 
 fn main() {
     let event = Event::new()
-        .summary("test event")
-        .description("here I have something really important to do")
+        .summary(";IMPORTANCE=very;test event")
+        .description("here; I have something; really important to do")
         .starts(Utc::now())
         .class(Class::Confidential)
         .ends(Utc::now() + Duration::days(1))
         .append_property(
             Property::new("TEST", "FOOBAR")
                 .add_parameter("IMPORTANCE", "very")
                 .add_parameter("DUE", "tomorrow")
+                .add_parameter("COMPLEX", r#"this is code; I think"#)
+                .add_parameter("keyval", "color:red")
+                .add_parameter("CODE", "this is code; so I quote")
                 .done(),
         )
         .uid("my.own.id")
@@ -34,10 +37,10 @@ fn main() {
 
     println!("{}", &ical); // print what we built
     println!("{}", from_parsed); // print what parsed
-    println!("{:#?}", built_calendar); // inner representation of what we built
-    println!("{:#?}", from_parsed); // inner representation of what we built and then parsed
+    println!("built calendar:\n{:#?}", built_calendar); // inner representation of what we built
+    println!("from parsed:\n{:#?}", from_parsed); // inner representation of what we built and then parsed
     println!(
-        "{:#?}",
+        "read_calenar:\n{:#?}",
         parser::read_calendar(&parser::unfold(&ical)).unwrap()
     ); // inner presentation of the parser's data structure
 }

src/parser/parsed_string.rs

@@ -12,17 +12,42 @@ impl ParseString<'_> {
             Cow::Owned(ref s) => ParseString(Cow::Owned(s.clone())),
         }
     }
+
     pub fn into_owned(self) -> ParseString<'static> {
         match self.0 {
             Cow::Borrowed(s) => ParseString(Cow::Owned(s.to_owned())),
             Cow::Owned(s) => ParseString(Cow::Owned(s)),
         }
     }
+
     pub fn as_str(&self) -> &str {
         self.0.as_ref()
     }
 }
 
+impl<'a> ParseString<'a> {
+    pub fn unescape_text(self) -> ParseString<'a> {
+        if self.0.contains(r#"\\"#)
+            || self.0.contains(r#"\,"#)
+            || self.0.contains(r#"\;"#)
+            || self.0.contains(r#"\:"#)
+            || self.0.contains(r#"\N"#)
+            || self.0.contains(r#"\n"#)
+        {
+            self.0
+                .replace(r#"\\"#, r#"\"#)
+                .replace(r#"\,"#, ",")
+                .replace(r#"\;"#, ";")
+                .replace(r#"\:"#, ":")
+                .replace(r#"\N"#, "\n")
+                .replace(r#"\n"#, "\n")
+                .into()
+        } else {
+            self
+        }
+    }
+}
+
 impl PartialEq<Self> for ParseString<'_> {
     fn eq(&self, rhs: &Self) -> bool {
         self.as_ref() == rhs.as_ref()

src/parser/properties.rs

@@ -166,12 +166,22 @@ fn test_property() {
     );
 
     // TODO: newlines followed by spaces must be ignored
+    assert_parser!(
+        property,
+        "KEY4;foo=bar:VALUE\\n newline separated\n",
+        Property {
+            name: "KEY4".into(),
+            val: "VALUE\n newline separated".into(),
+            params: vec![Parameter::new_ref("foo", Some("bar"))]
+        }
+    );
+
     assert_parser!(
         property,
         "KEY3;foo=bar:VALUE\\n newline separated\n",
         Property {
             name: "KEY3".into(),
-            val: "VALUE\\n newline separated".into(),
+            val: "VALUE\n newline separated".into(),
             params: vec![Parameter::new_ref("foo", Some("bar"))]
         }
     );
@@ -192,7 +202,6 @@ fn test_property_with_dash() {
 
 #[test]
 fn parse_properties_from_rfc() {
-    // TODO: newlines followed by spaces must be ignored
     assert_parser!(
         property,
         "home.tel;type=fax,voice,msg:+49 3581 123456\n",
@@ -202,7 +211,7 @@ fn parse_properties_from_rfc() {
             params: vec![Parameter::new_ref("type", Some("fax,voice,msg"),)]
         }
     );
-    // TODO: newlines followed by spaces must be ignored
+
     assert_parser!(
         property,
         "email;internet:[email protected]\n",
@@ -221,7 +230,7 @@ fn parse_property_with_breaks() {
 
     let expectation = Property {
         name: "DESCRIPTION".into(),
-        val: "Hey, I'm gonna have a party\\n BYOB: Bring your own beer.\\n Hendrik\\n".into(),
+        val: "Hey, I'm gonna have a party\n BYOB: Bring your own beer.\n Hendrik\n".into(),
         params: vec![],
     };
 
@@ -309,8 +318,9 @@ pub fn property<'a, E: ParseError<&'a str> + ContextError<&'a str>>(
                             // this is for single line prop parsing, just so I can leave off the '\n'
                             take_while(|_| true),
                         ))
-                        .map(ParseString::from),
-                    ), // val TODO: replace this with something simpler!
+                        .map(ParseString::from)
+                        .map(ParseString::unescape_text),
+                    ),
                 ),
                 context(
                     "no-value property",

src/properties.rs

@@ -53,7 +53,7 @@ impl Property {
     pub fn new(key: &str, val: &str) -> Self {
         Property {
             key: key.to_owned(),
-            val: val.replace('\n', "\\n"),
+            val: val.to_owned(),
             params: HashMap::new(),
         }
     }
@@ -62,7 +62,7 @@ impl Property {
     pub fn new_pre_alloc(key: String, val: String) -> Self {
         Property {
             key,
-            val: val.replace('\n', "\\n"),
+            val,
             params: HashMap::new(),
         }
     }
@@ -140,16 +140,38 @@ impl Property {
         }
     }
 
+    /// <https://datatracker.ietf.org/doc/html/rfc5545#section-3.3.11>
+    fn escape_text(input: &str) -> String {
+        input
+            .replace('\\', r#"\\"#)
+            .replace(',', r#"\,"#)
+            .replace(';', r#"\;"#)
+            .replace(':', r#"\:"#)
+            .replace('\n', r#"\N"#)
+    }
+
+    fn quote_if_contains_colon(input: &str) -> String {
+        if input.contains([':', ';']) {
+            let mut quoted = String::with_capacity(input.len() + 2);
+            quoted.push('"');
+            quoted.push_str(input);
+            quoted.push('"');
+            quoted
+        } else {
+            input.to_string()
+        }
+    }
+
     /// Writes this Property to `out`
     pub(crate) fn fmt_write<W: Write>(&self, out: &mut W) -> Result<(), fmt::Error> {
         // A nice starting capacity for the majority of content lines
         let mut line = String::with_capacity(150);
 
         write!(line, "{}", self.key)?;
-        for Parameter { key, val: value } in self.params.values() {
-            write!(line, ";{}={}", key, value)?;
+        for Parameter { key, val } in self.params.values() {
+            write!(line, ";{}={}", key, Self::quote_if_contains_colon(val))?;
         }
-        write!(line, ":{}", self.val)?;
+        write!(line, ":{}", Self::escape_text(&self.val))?;
         write_crlf!(out, "{}", fold_line(&line))?;
         Ok(())
     }

tests/full_circle.rs

@@ -0,0 +1,109 @@
+#![cfg(feature = "parser")]
+use std::str::FromStr;
+
+use chrono::*;
+use icalendar::*;
+// use pretty_assertions::assert_eq;
+
+fn get_summary(calendar: &Calendar) -> &str {
+    calendar.components[0]
+        .as_event()
+        .unwrap()
+        .get_summary()
+        .unwrap()
+}
+fn get_description(calendar: &Calendar) -> &str {
+    calendar.components[0]
+        .as_event()
+        .unwrap()
+        .get_description()
+        .unwrap()
+}
+
+fn init_test_event() -> (&'static str, &'static str, Calendar) {
+    let summary = ";IMPORTANCE=very;test event";
+    let description = "this, contains: many escapeworthy->\n<-;characters";
+
+    let event = Event::new()
+        .summary(summary)
+        .description(description)
+        .starts(Utc::now())
+        .class(Class::Confidential)
+        .ends(Utc::now() + Duration::days(1))
+        .append_property(
+            Property::new("TEST", "FOOBAR")
+                .add_parameter("IMPORTANCE", "very")
+                .add_parameter("COMPLEX", r#"this is code; I think"#)
+                .add_parameter("keyval", "color:red")
+                .done(),
+        )
+        .uid("my.own.id")
+        .done();
+
+    let todo = Todo::new().summary("Buy some: milk").done();
+
+    let mut built_calendar = Calendar::new();
+    built_calendar.push(event);
+    built_calendar.push(todo);
+    (summary, description, built_calendar)
+}
+
+#[test]
+#[ignore = "equality difficult"]
+fn serializes_correctly() {
+    let (_, _, built_calendar) = init_test_event();
+    println!("built calendar:\n{:#?}", built_calendar); // inner representation of what we built
+
+    let serialized = built_calendar.to_string();
+    println!("serialized: {}", &serialized); // print what we built
+
+    let from_parsed = Calendar::from_str(&serialized).unwrap();
+    println!("parsed again:\n{:#?}", from_parsed); // inner representation of what we built and then parsed
+
+    assert_eq!(built_calendar, from_parsed)
+}
+
+#[test]
+fn escape_late() {
+    let (summary, description, built_calendar) = init_test_event();
+    println!("built calendar:\n{:#?}", built_calendar); // inner representation of what we built
+
+    let serialized = built_calendar.to_string();
+    println!("serialized: {}", &serialized); // print what we built
+
+    let from_parsed = Calendar::from_str(&serialized).unwrap();
+    println!("parsed again:\n{:#?}", from_parsed); // inner representation of what we built and then parsed
+
+    // these should not be escaped
+    assert_eq!(get_summary(&built_calendar), summary);
+    assert_eq!(get_description(&built_calendar), description);
+}
+
+#[test]
+fn unescape_text() {
+    let (summary, description, built_calendar) = init_test_event();
+    println!("built calendar:\n{:#?}", built_calendar); // inner representation of what we built
+
+    let serialized = built_calendar.to_string();
+    println!("serialized:\n {}", &serialized); // print what we built
+
+    let from_parsed = Calendar::from_str(&serialized).unwrap();
+    println!("parsed again:\n{:#?}", from_parsed); // inner representation of what we built and then parsed
+
+    assert_eq!(get_summary(&from_parsed), summary);
+    assert_eq!(get_description(&from_parsed), description);
+}
+
+#[test]
+fn reparse_equivalence() {
+    let (_summary, _description, built_calendar) = init_test_event();
+    println!("built calendar:\n{:#?}", built_calendar); // inner representation of what we built
+
+    let serialized = built_calendar.to_string();
+    println!("serialized: {}", &serialized); // print what we built
+
+    let from_parsed = Calendar::from_str(&serialized).unwrap();
+    println!("parsed again:\n{:#?}", from_parsed); // inner representation of what we built and then parsed
+
+    assert_eq!(get_summary(&built_calendar), get_summary(&from_parsed),);
+}

tests/reserialize.rs

@@ -30,7 +30,7 @@ END:VTODO\r
 BEGIN:VALARM\r
 TRIGGER;RELATED=END:-P2D\r
 ACTION:EMAIL\r
-ATTENDEE:mailto:[email protected]\r
+ATTENDEE:\"mailto:[email protected]\"\r
 SUMMARY:*** REMINDER: SEND AGENDA FOR WEEKLY STAFF MEETING ***\r
 DESCRIPTION:A draft agenda needs to be sent out to the attendees to the wee\r
  kly managers meeting (MGR-LIST). Attached is a pointer the document templat\r