private String getStringToSign(MessageContext msgCtxt) throws Exception {
String msg = (String) this.properties.get("string-to-sign");
if (msg == null || msg.equals("")) {
// by default, get the content of the message (either request or response)
return msgCtxt.getVariable("message.content");
}
// replace ALL curly-braced items in the string-to-sign
TemplateString ts = new TemplateString(msg);
Map valuesMap = new HashMap();
for (String s : ts.variableNames) {
valuesMap.put(s, msgCtxt.getVariable(s));
}
StrSubstitutor sub = new StrSubstitutor(valuesMap);
String resolvedString = sub.replace(ts.template);
return resolvedString;
}
// If the value of a property value begins and ends with curlies,
// and contains no spaces, eg, {apiproxy.name}, then "resolve" the
// value by de-referencing the context variable whose name appears
// between the curlies.
private String resolvePropertyValue(String spec, MessageContext msgCtxt) {
if (spec.startsWith("{") && spec.endsWith("}") && (spec.indexOf(" ") == -1)) {
String varname = spec.substring(1, spec.length() - 1);
String value = msgCtxt.getVariable(varname);
return value;
}
return spec;
}
