eml-nl 0.5.0

Parse, manipulate and emit EML_NL documents
Documentation 
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use crate::{
    EMLError, NS_DS,
    io::{EMLElement, EMLElementReader, EMLElementWriter, QualifiedName, collect_struct},
};

/// XML CanonicalizationMethod element
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct CanonicalizationMethod {
    algorithm: String,
}

impl CanonicalizationMethod {
    /// Create a new CanonicalizationMethod with the given algorithm.
    pub fn new(algorithm: impl Into<String>) -> Self {
        CanonicalizationMethod {
            algorithm: algorithm.into(),
        }
    }
}

impl EMLElement for CanonicalizationMethod {
    const EML_NAME: QualifiedName<'_, '_> =
        QualifiedName::from_static("CanonicalizationMethod", Some(NS_DS));

    fn read_eml(elem: &mut EMLElementReader<'_, '_>) -> Result<Self, EMLError> {
        Ok(collect_struct!(
            elem,
            CanonicalizationMethod {
                algorithm: elem.attribute_value_req("Algorithm")?.into_owned(),
            }
        ))
    }

    fn write_eml(&self, writer: EMLElementWriter) -> Result<(), EMLError> {
        writer.attr("Algorithm", &self.algorithm)?.empty()?;

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::io::{EMLParsingMode, EMLRead, test_write_eml_element, test_xml_fragment};

    #[test]
    fn test_canonicalization_method_construction() {
        let method = CanonicalizationMethod::new("test-algorithm");
        assert_eq!(method.algorithm, "test-algorithm");
    }

    #[test]
    fn test_canonicalization_method_parsing() {
        let xml = test_xml_fragment(
            r#"<ds:CanonicalizationMethod xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Algorithm="test-algorithm"/>"#,
        );
        let method = CanonicalizationMethod::parse_eml(&xml, EMLParsingMode::Strict).unwrap();
        assert_eq!(method.algorithm, "test-algorithm");

        let xml_output = test_write_eml_element(&method, &[NS_DS]).unwrap();
        assert_eq!(xml_output, xml);
    }
}