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use std::fmt; use std::str; use der::{DerObject,DerObjectContent}; use rusticata_macros::debug; #[derive(Clone,PartialEq)] pub enum PrettyPrinterFlag { ShowHeader, } pub struct PrettyDer<'a> { obj: &'a DerObject<'a>, indent: usize, inc: usize, flags: Vec<PrettyPrinterFlag>, } impl<'a> DerObject<'a> { pub fn as_pretty(&'a self, indent:usize, increment:usize) -> PrettyDer<'a> { PrettyDer{ obj: self, indent: indent, inc: increment, flags: Vec::new(), } } } impl<'a> PrettyDer<'a> { pub fn set_flag(&mut self, flag: PrettyPrinterFlag) { if ! self.flags.contains(&flag) { self.flags.push(flag); } } pub fn next_indent<'b>(&self, obj: &'b DerObject) -> PrettyDer<'b> { PrettyDer{ obj: obj, indent: self.indent + self.inc, inc: self.inc, flags: self.flags.to_vec(), } } } impl<'a> fmt::Debug for PrettyDer<'a> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { if self.indent > 0 { try!(write!(f, "{:1$}", " ", self.indent)); }; if self.flags.contains(&PrettyPrinterFlag::ShowHeader) { try!(write!(f, "[c:{}, s:{}, t:{}] ", self.obj.class, self.obj.structured, self.obj.tag)); }; fn print_utf8_string_with_type(f: &mut fmt::Formatter, s: &[u8], ty: &str) -> fmt::Result { match str::from_utf8(s) { Ok(b) => write!(f, "{}(\"{}\")\n", ty, b), Err(e) => write!(f, "{}({:?}) <error decoding utf8 string: {:?}>\n", ty, s, e), } } match self.obj.content { DerObjectContent::Boolean(b) => write!(f, "Boolean({:?})\n", b), DerObjectContent::Integer(i) => write!(f, "Integer({:?})\n", debug::HexSlice{d:i}), DerObjectContent::Enum(i) => write!(f, "Enum({})\n", i), DerObjectContent::OID(ref v) => write!(f, "OID({:?})\n", v), DerObjectContent::Null => write!(f, "Null\n"), DerObjectContent::OctetString(v) => write!(f, "OctetString({:?})\n", debug::HexSlice{d:v}), DerObjectContent::BitString(u,v) => write!(f, "BitString({},{:?})\n", u, debug::HexSlice{d:v}), DerObjectContent::GeneralizedTime(s) => print_utf8_string_with_type(f, s, "GeneralizedTime"), DerObjectContent::UTCTime(s) => print_utf8_string_with_type(f, s, "UTCTime"), DerObjectContent::PrintableString(s) => print_utf8_string_with_type(f, s, "PrintableString"), DerObjectContent::NumericString(s) => print_utf8_string_with_type(f, s, "NumericString"), DerObjectContent::UTF8String(s) => print_utf8_string_with_type(f, s, "UTF8String"), DerObjectContent::IA5String(s) => print_utf8_string_with_type(f, s, "IA5String"), DerObjectContent::T61String(s) => print_utf8_string_with_type(f, s, "T61String"), DerObjectContent::BmpString(s) => print_utf8_string_with_type(f, s, "BmpString"), DerObjectContent::GeneralString(s) => print_utf8_string_with_type(f, s, "GeneralString"), DerObjectContent::ContextSpecific(n,ref o) => { let new_indent = self.indent + self.inc; try!(write!(f, "ContextSpecific [{}] {{\n", n)); match *o { Some(ref obj) => try!(write!(f, "{:?}", self.next_indent(obj))), None => try!(write!(f, "{:1$}None\n", " ", new_indent)), }; if self.indent > 0 { try!(write!(f, "{:1$}", " ", self.indent)); }; try!(write!(f, "}}\n")); Ok(()) }, DerObjectContent::Set(ref v) | DerObjectContent::Sequence(ref v) => { let ty = if self.obj.tag == 0x10 { "Sequence" } else { "Set" }; try!(write!(f, "{}[\n", ty)); for o in v { try!(write!(f, "{:?}", self.next_indent(o))); }; if self.indent > 0 { try!(write!(f, "{:1$}", " ", self.indent)); }; try!(write!(f, "]\n")); Ok(()) }, DerObjectContent::Unknown(o) => write!(f, "Unknown({:?})\n", o), } } } #[cfg(test)] mod tests { use der::*; use super::PrettyPrinterFlag; #[test] fn test_pretty_print() { let d = DerObject::from_obj(DerObjectContent::Sequence(vec![ DerObject::from_int_slice(b"\x01\x00\x01"), DerObject::from_int_slice(b"\x01\x00\x01"), DerObject::from_obj(DerObjectContent::Set(vec![ DerObject::from_int_slice(b"\x01"), DerObject::from_int_slice(b"\x02"), ])) ])); println!("{:?}", d.as_pretty(0,2)); let mut pp = d.as_pretty(0,4); pp.set_flag(PrettyPrinterFlag::ShowHeader); println!("{:?}", pp); } }