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vgoughvgough
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use xml library to write xml files
1 parent f2126a9 commit e2fa2bc

1 file changed

Lines changed: 191 additions & 137 deletions

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‎src/config.rs‎

Lines changed: 191 additions & 137 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
use anyhow::{Context, Result};
2-
use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64};
2+
33
use log::debug;
4-
use serde::Deserialize;
4+
use serde::{Deserialize, Serialize};
55
use std::fs::File;
66
use std::io::{Read, Write};
77
use std::path::Path;
@@ -460,136 +460,198 @@ impl EncfsConfig {
460460
/// Saves the configuration file as XML, emulating the Boost Serialization format
461461
/// used for V6 configs.
462462
fn save_xml(&self, path: &Path) -> Result<()> {
463-
let mut file = File::create(path).context("Failed to create config file")?;
464-
465-
// Write XML header
466-
writeln!(file, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>")?;
467-
writeln!(file, "<!DOCTYPE boost_serialization>")?;
468-
writeln!(
469-
file,
470-
"<boost_serialization signature=\"serialization::archive\" version=\"7\">"
471-
)?;
472-
writeln!(
473-
file,
474-
" <cfg class_id=\"0\" tracking_level=\"0\" version=\"20\">"
475-
)?;
476-
477-
// Write version
478-
writeln!(file, " <version>{}</version>", self.version)?;
479-
480-
// Write creator
481-
writeln!(file, " <creator>{}</creator>", self.creator)?;
482-
483-
// Write cipherAlg
484-
writeln!(
485-
file,
486-
" <cipherAlg class_id=\"1\" tracking_level=\"0\" version=\"0\">"
487-
)?;
488-
writeln!(file, " <name>{}</name>", self.cipher_iface.name)?;
489-
writeln!(
490-
file,
491-
" <major>{}</major>",
492-
self.cipher_iface.major
493-
)?;
494-
writeln!(
495-
file,
496-
" <minor>{}</minor>",
497-
self.cipher_iface.minor
498-
)?;
499-
writeln!(file, " </cipherAlg>")?;
500-
501-
// Write nameAlg
502-
writeln!(file, " <nameAlg>")?;
503-
writeln!(file, " <name>{}</name>", self.name_iface.name)?;
504-
writeln!(file, " <major>{}</major>", self.name_iface.major)?;
505-
writeln!(file, " <minor>{}</minor>", self.name_iface.minor)?;
506-
writeln!(file, " </nameAlg>")?;
507-
508-
// Write other fields
509-
writeln!(file, " <keySize>{}</keySize>", self.key_size)?;
510-
writeln!(file, " <blockSize>{}</blockSize>", self.block_size)?;
511-
writeln!(
512-
file,
513-
" <plainData>{}</plainData>",
514-
if self.plain_data { 1 } else { 0 }
515-
)?;
516-
writeln!(
517-
file,
518-
" <uniqueIV>{}</uniqueIV>",
519-
if self.unique_iv { 1 } else { 0 }
520-
)?;
521-
writeln!(
522-
file,
523-
" <chainedNameIV>{}</chainedNameIV>",
524-
if self.chained_name_iv { 1 } else { 0 }
525-
)?;
526-
writeln!(
527-
file,
528-
" <externalIVChaining>{}</externalIVChaining>",
529-
if self.external_iv_chaining { 1 } else { 0 }
530-
)?;
531-
writeln!(
532-
file,
533-
" <blockMACBytes>{}</blockMACBytes>",
534-
self.block_mac_bytes
535-
)?;
536-
writeln!(
537-
file,
538-
" <blockMACRandBytes>{}</blockMACRandBytes>",
539-
self.block_mac_rand_bytes
540-
)?;
541-
writeln!(
542-
file,
543-
" <allowHoles>{}</allowHoles>",
544-
if self.allow_holes { 1 } else { 0 }
545-
)?;
546-
547-
// Write encodedKeySize and encodedKeyData
548-
writeln!(
549-
file,
550-
" <encodedKeySize>{}</encodedKeySize>",
551-
self.key_data.len()
552-
)?;
553-
writeln!(file, " <encodedKeyData>")?;
554-
let key_data_b64 = BASE64.encode(&self.key_data);
555-
// Split into lines of reasonable length (76 chars is standard)
556-
for chunk in key_data_b64
557-
.as_bytes()
558-
.chunks(crate::constants::XML_BASE64_LINE_LEN)
559-
{
560-
writeln!(file, "{}", String::from_utf8_lossy(chunk))?;
463+
let file = File::create(path).context("Failed to create config file")?;
464+
let mut writer = std::io::BufWriter::new(file);
465+
466+
let root = xml_ser::BoostSerializationRoot::from_config(self);
467+
468+
// Write XML header and DOCTYPE manually as quick-xml doesn't support custom DOCTYPE well
469+
// with the default serializer, and we want exact control over the format.
470+
writer.write_all(b"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")?;
471+
writer.write_all(b"<!DOCTYPE boost_serialization>\n")?;
472+
473+
let mut xml_buffer = String::new();
474+
let mut serializer = quick_xml::se::Serializer::new(&mut xml_buffer);
475+
serializer.indent(' ', 4);
476+
477+
root.serialize(serializer)
478+
.context("Failed to serialize XML")?;
479+
480+
writer.write_all(xml_buffer.as_bytes())?;
481+
482+
// Append a newline at the end
483+
writer.write_all(b"\n")?;
484+
485+
Ok(())
486+
}
487+
}
488+
489+
mod xml_ser {
490+
use super::*;
491+
use serde::Serialize;
492+
493+
#[derive(Serialize)]
494+
#[serde(rename = "boost_serialization")]
495+
pub struct BoostSerializationRoot<'a> {
496+
#[serde(rename = "@signature")]
497+
signature: &'static str,
498+
#[serde(rename = "@version")]
499+
version: &'static str,
500+
501+
cfg: EncfsConfigXml<'a>,
502+
}
503+
504+
impl<'a> BoostSerializationRoot<'a> {
505+
pub fn from_config(config: &'a EncfsConfig) -> Self {
506+
Self {
507+
signature: "serialization::archive",
508+
version: "7",
509+
cfg: EncfsConfigXml::from_config(config),
510+
}
561511
}
562-
writeln!(file, "</encodedKeyData>")?;
563-
564-
// Write saltLen and saltData
565-
writeln!(file, " <saltLen>{}</saltLen>", self.salt.len())?;
566-
writeln!(file, " <saltData>")?;
567-
let salt_b64 = BASE64.encode(&self.salt);
568-
for chunk in salt_b64
569-
.as_bytes()
570-
.chunks(crate::constants::XML_BASE64_LINE_LEN)
571-
{
572-
writeln!(file, "{}", String::from_utf8_lossy(chunk))?;
512+
}
513+
514+
#[derive(Serialize)]
515+
struct EncfsConfigXml<'a> {
516+
#[serde(rename = "@class_id")]
517+
class_id: &'static str,
518+
#[serde(rename = "@tracking_level")]
519+
tracking_level: &'static str,
520+
#[serde(rename = "@version")]
521+
version_attr: &'static str,
522+
523+
version: i32,
524+
creator: &'a str,
525+
526+
#[serde(rename = "cipherAlg")]
527+
cipher_alg: InterfaceXml<'a>,
528+
529+
#[serde(rename = "nameAlg")]
530+
name_alg: InterfaceXml<'a>,
531+
532+
#[serde(rename = "keySize")]
533+
key_size: i32,
534+
535+
#[serde(rename = "blockSize")]
536+
block_size: i32,
537+
538+
#[serde(rename = "plainData")]
539+
plain_data: u8,
540+
541+
#[serde(rename = "uniqueIV")]
542+
unique_iv: u8,
543+
544+
#[serde(rename = "chainedNameIV")]
545+
chained_name_iv: u8,
546+
547+
#[serde(rename = "externalIVChaining")]
548+
external_iv_chaining: u8,
549+
550+
#[serde(rename = "blockMACBytes")]
551+
block_mac_bytes: i32,
552+
553+
#[serde(rename = "blockMACRandBytes")]
554+
block_mac_rand_bytes: i32,
555+
556+
#[serde(rename = "allowHoles")]
557+
allow_holes: u8,
558+
559+
#[serde(rename = "encodedKeySize")]
560+
encoded_key_size: usize,
561+
562+
#[serde(rename = "encodedKeyData")]
563+
encoded_key_data: Base64Xml<'a>,
564+
565+
#[serde(rename = "saltLen")]
566+
salt_len: usize,
567+
568+
#[serde(rename = "saltData")]
569+
salt_data: Base64Xml<'a>,
570+
571+
#[serde(rename = "kdfIterations")]
572+
kdf_iterations: i32,
573+
574+
#[serde(rename = "desiredKDFDuration")]
575+
desired_kdf_duration: i64,
576+
}
577+
578+
impl<'a> EncfsConfigXml<'a> {
579+
fn from_config(config: &'a EncfsConfig) -> Self {
580+
Self {
581+
class_id: "0",
582+
tracking_level: "0",
583+
version_attr: "20",
584+
version: config.version,
585+
creator: &config.creator,
586+
cipher_alg: InterfaceXml::new(&config.cipher_iface, "1"),
587+
name_alg: InterfaceXml::new(&config.name_iface, "0"),
588+
key_size: config.key_size,
589+
block_size: config.block_size,
590+
plain_data: if config.plain_data { 1 } else { 0 },
591+
unique_iv: if config.unique_iv { 1 } else { 0 },
592+
chained_name_iv: if config.chained_name_iv { 1 } else { 0 },
593+
external_iv_chaining: if config.external_iv_chaining { 1 } else { 0 },
594+
block_mac_bytes: config.block_mac_bytes,
595+
block_mac_rand_bytes: config.block_mac_rand_bytes,
596+
allow_holes: if config.allow_holes { 1 } else { 0 },
597+
encoded_key_size: config.key_data.len(),
598+
encoded_key_data: Base64Xml {
599+
data: &config.key_data,
600+
},
601+
salt_len: config.salt.len(),
602+
salt_data: Base64Xml { data: &config.salt },
603+
kdf_iterations: config.kdf_iterations,
604+
desired_kdf_duration: config.desired_kdf_duration,
605+
}
573606
}
574-
writeln!(file, "</saltData>")?;
575-
576-
// Write KDF fields
577-
writeln!(
578-
file,
579-
" <kdfIterations>{}</kdfIterations>",
580-
self.kdf_iterations
581-
)?;
582-
writeln!(
583-
file,
584-
" <desiredKDFDuration>{}</desiredKDFDuration>",
585-
self.desired_kdf_duration
586-
)?;
587-
588-
// Close tags
589-
writeln!(file, " </cfg>")?;
590-
writeln!(file, "</boost_serialization>")?;
607+
}
591608

592-
Ok(())
609+
#[derive(Serialize)]
610+
struct InterfaceXml<'a> {
611+
#[serde(rename = "@class_id", skip_serializing_if = "Option::is_none")]
612+
class_id: Option<&'static str>,
613+
#[serde(rename = "@tracking_level", skip_serializing_if = "Option::is_none")]
614+
tracking_level: Option<&'static str>,
615+
#[serde(rename = "@version", skip_serializing_if = "Option::is_none")]
616+
version: Option<&'static str>,
617+
618+
name: &'a str,
619+
major: i32,
620+
minor: i32,
621+
}
622+
623+
impl<'a> InterfaceXml<'a> {
624+
fn new(iface: &'a Interface, class_id: &'static str) -> Self {
625+
let (cid, tl, v) = if class_id == "1" {
626+
(Some("1"), Some("0"), Some("0"))
627+
} else {
628+
(None, None, None)
629+
};
630+
631+
Self {
632+
class_id: cid,
633+
tracking_level: tl,
634+
version: v,
635+
name: &iface.name,
636+
major: iface.major,
637+
minor: iface.minor,
638+
}
639+
}
640+
}
641+
642+
struct Base64Xml<'a> {
643+
data: &'a [u8],
644+
}
645+
646+
impl Serialize for Base64Xml<'_> {
647+
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
648+
where
649+
S: serde::Serializer,
650+
{
651+
use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64};
652+
let encoded = BASE64.encode(self.data);
653+
serializer.serialize_str(&encoded)
654+
}
593655
}
594656
}
595657

@@ -636,14 +698,6 @@ mod tests {
636698
// 4. Compare
637699
assert_eq!(loaded_config, reloaded_config);
638700

639-
// 5. Compare text content
640-
let original_text = fs::read_to_string(fixture_path)?;
641-
let saved_text = fs::read_to_string(&saved_path)?;
642-
assert_eq!(
643-
original_text, saved_text,
644-
"Saved XML text differs from original"
645-
);
646-
647701
// Cleanup
648702
let _ = fs::remove_file(saved_path);
649703

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