opensaml 0.1.2

SAML 2.0 Service Provider library (bergshamra for XML crypto).
Documentation 
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//! HTTP-POST binding auto-submit form.

use super::escape::html_escape;

/// Build a self-submitting HTML form for the SAML HTTP-POST binding.
///
/// `param_name` is `SAMLRequest` or `SAMLResponse`; `b64_value` is the
/// base64-encoded message. An optional `relay_state` is added as a hidden
/// field. All values are HTML-escaped.
pub fn saml_post_binding_form(
    action: &str,
    param_name: &str,
    b64_value: &str,
    relay_state: Option<&str>,
) -> String {
    let action = html_escape(action);
    let name = html_escape(param_name);
    let value = html_escape(b64_value);
    let mut fields = format!("<input type=\"hidden\" name=\"{name}\" value=\"{value}\"/>");
    if let Some(state) = relay_state {
        let state = html_escape(state);
        fields.push_str(&format!(
            "<input type=\"hidden\" name=\"RelayState\" value=\"{state}\"/>"
        ));
    }
    format!(
        "<!DOCTYPE html><html><body onload=\"document.forms[0].submit()\">\
<form method=\"post\" action=\"{action}\">{fields}\
<noscript><input type=\"submit\" value=\"Continue\"/></noscript></form></body></html>"
    )
}