mirror of
https://github.com/samsonjs/vdirsyncer.git
synced 2026-03-29 09:35:50 +00:00
Rust: new item module
This commit is contained in:
Markus Unterwaditzer
parent
cbb15e1895
commit
619373a8e8
2 changed files with 149 additions and 138 deletions
147
rust/src/item.rs
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147
rust/src/item.rs
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@ -0,0 +1,147 @@
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use std::ffi::{CStr, CString};
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use std::os::raw::c_char;
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use std::mem;
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use std::ptr;
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use vobject;
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use ring;
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use std::fmt::Write;
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use VdirsyncerError;
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const EMPTY_STRING: *const c_char = b"\0" as *const u8 as *const c_char;
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// Workaround to be able to use opaque pointer
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#[repr(C)]
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pub struct VdirsyncerComponent(vobject::Component);
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_get_uid(c: *mut VdirsyncerComponent) -> *const c_char {
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match safe_get_uid(&(*c).0) {
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Some(x) => CString::new(x).unwrap().into_raw(),
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None => EMPTY_STRING
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}
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}
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#[inline]
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fn safe_get_uid(c: &vobject::Component) -> Option<String> {
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let mut stack = vec![c];
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while let Some(vobj) = stack.pop() {
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if let Some(prop) = vobj.get_only("UID") {
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return Some(prop.value_as_string());
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}
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stack.extend(vobj.subcomponents.iter());
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};
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None
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_parse_component(s: *const c_char, err: *mut VdirsyncerError) -> *mut VdirsyncerComponent {
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let cstring = CStr::from_ptr(s);
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match vobject::parse_component(cstring.to_str().unwrap()) {
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Ok(x) => mem::transmute(Box::new(VdirsyncerComponent(x))),
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Err(e) => {
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(*err).failed = true;
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(*err).msg = CString::new(e.into_string()).unwrap().into_raw();
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mem::zeroed()
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}
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_free_component(c: *mut VdirsyncerComponent) {
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let _: Box<VdirsyncerComponent> = mem::transmute(c);
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_clear_err(e: *mut VdirsyncerError) {
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CString::from_raw((*e).msg);
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(*e).msg = ptr::null_mut();
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_change_uid(c: *mut VdirsyncerComponent, uid: *const c_char) {
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let uid_cstring = CStr::from_ptr(uid);
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change_uid(&mut (*c).0, uid_cstring.to_str().unwrap());
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}
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fn change_uid(c: &mut vobject::Component, uid: &str) {
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let mut stack = vec![c];
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while let Some(component) = stack.pop() {
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match component.name.as_ref() {
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"VEVENT" | "VTODO" | "VJOURNAL" | "VCARD" => {
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if !uid.is_empty() {
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component.set(vobject::Property::new("UID", uid));
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} else {
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component.remove("UID");
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}
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},
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_ => ()
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}
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stack.extend(component.subcomponents.iter_mut());
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_clone_component(c: *mut VdirsyncerComponent) -> *mut VdirsyncerComponent {
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mem::transmute(Box::new((*c).0.clone()))
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_write_component(c: *mut VdirsyncerComponent) -> *const c_char {
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CString::new(vobject::write_component(&(*c).0)).unwrap().into_raw()
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_hash_component(c: *mut VdirsyncerComponent) -> *const c_char {
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CString::new(safe_hash_component(&(*c).0)).unwrap().into_raw()
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}
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fn safe_hash_component(c: &vobject::Component) -> String {
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let mut new_c = c.clone();
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{
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let mut stack = vec![&mut new_c];
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while let Some(component) = stack.pop() {
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// PRODID is changed by radicale for some reason after upload
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component.remove("PRODID");
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// Sometimes METHOD:PUBLISH is added by WebCAL providers, for us it doesn't make a difference
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component.remove("METHOD");
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// X-RADICALE-NAME is used by radicale, because hrefs don't really exist in their filesystem backend
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component.remove("X-RADICALE-NAME");
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// Apparently this is set by Horde?
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// https://github.com/pimutils/vdirsyncer/issues/318
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component.remove("X-WR-CALNAME");
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// Those are from the VCARD specification and is supposed to change when the
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// item does -- however, we can determine that ourselves
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component.remove("REV");
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component.remove("LAST-MODIFIED");
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component.remove("CREATED");
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// Some iCalendar HTTP calendars generate the DTSTAMP at request time, so
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// this property always changes when the rest of the item didn't. Some do
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// the same with the UID.
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//
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// - Google's read-only calendar links
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// - http://www.feiertage-oesterreich.at/
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component.remove("DTSTAMP");
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component.remove("UID");
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if component.name == "VCALENDAR" {
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component.subcomponents.retain(|ref c| c.name != "VTIMEZONE");
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}
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stack.extend(component.subcomponents.iter_mut());
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}
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}
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// FIXME: Possible optimization: Stream component to hasher instead of allocating new string
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let digest = ring::digest::digest(&ring::digest::SHA256, vobject::write_component(&new_c).as_bytes());
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let mut rv = String::new();
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for &byte in digest.as_ref() {
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write!(&mut rv, "{:x}", byte).unwrap();
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}
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rv
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}
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140
rust/src/lib.rs
140
rust/src/lib.rs
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@ -1,14 +1,10 @@
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extern crate vobject;
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extern crate ring;
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use std::ffi::{CStr, CString};
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use std::ffi::CStr;
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use std::os::raw::c_char;
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use std::mem;
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use std::ptr;
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use std::fmt::Write;
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const EMPTY_STRING: *const c_char = b"\0" as *const u8 as *const c_char;
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pub mod item;
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#[repr(C)]
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pub struct VdirsyncerError {
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@ -16,140 +12,8 @@ pub struct VdirsyncerError {
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pub msg: *mut c_char,
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}
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// Workaround to be able to use opaque pointer
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#[repr(C)]
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pub struct VdirsyncerComponent(vobject::Component);
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_get_uid(c: *mut VdirsyncerComponent) -> *const c_char {
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match safe_get_uid(&(*c).0) {
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Some(x) => CString::new(x).unwrap().into_raw(),
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None => EMPTY_STRING
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}
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}
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#[inline]
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fn safe_get_uid(c: &vobject::Component) -> Option<String> {
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let mut stack = vec![c];
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while let Some(vobj) = stack.pop() {
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if let Some(prop) = vobj.get_only("UID") {
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return Some(prop.value_as_string());
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}
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stack.extend(vobj.subcomponents.iter());
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};
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None
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_free_str(s: *const c_char) {
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CStr::from_ptr(s);
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_parse_component(s: *const c_char, err: *mut VdirsyncerError) -> *mut VdirsyncerComponent {
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let cstring = CStr::from_ptr(s);
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match vobject::parse_component(cstring.to_str().unwrap()) {
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Ok(x) => mem::transmute(Box::new(VdirsyncerComponent(x))),
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Err(e) => {
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(*err).failed = true;
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(*err).msg = CString::new(e.into_string()).unwrap().into_raw();
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mem::zeroed()
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}
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_free_component(c: *mut VdirsyncerComponent) {
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let _: Box<VdirsyncerComponent> = mem::transmute(c);
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_clear_err(e: *mut VdirsyncerError) {
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CString::from_raw((*e).msg);
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(*e).msg = ptr::null_mut();
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_change_uid(c: *mut VdirsyncerComponent, uid: *const c_char) {
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let uid_cstring = CStr::from_ptr(uid);
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change_uid(&mut (*c).0, uid_cstring.to_str().unwrap());
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}
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fn change_uid(c: &mut vobject::Component, uid: &str) {
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let mut stack = vec![c];
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while let Some(component) = stack.pop() {
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match component.name.as_ref() {
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"VEVENT" | "VTODO" | "VJOURNAL" | "VCARD" => {
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if !uid.is_empty() {
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component.set(vobject::Property::new("UID", uid));
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} else {
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component.remove("UID");
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}
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},
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_ => ()
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}
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stack.extend(component.subcomponents.iter_mut());
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_clone_component(c: *mut VdirsyncerComponent) -> *mut VdirsyncerComponent {
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mem::transmute(Box::new((*c).0.clone()))
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_write_component(c: *mut VdirsyncerComponent) -> *const c_char {
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CString::new(vobject::write_component(&(*c).0)).unwrap().into_raw()
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}
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#[no_mangle]
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pub unsafe extern "C" fn vdirsyncer_hash_component(c: *mut VdirsyncerComponent) -> *const c_char {
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CString::new(safe_hash_component(&(*c).0)).unwrap().into_raw()
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}
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fn safe_hash_component(c: &vobject::Component) -> String {
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let mut new_c = c.clone();
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{
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let mut stack = vec![&mut new_c];
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while let Some(component) = stack.pop() {
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// PRODID is changed by radicale for some reason after upload
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component.remove("PRODID");
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// Sometimes METHOD:PUBLISH is added by WebCAL providers, for us it doesn't make a difference
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component.remove("METHOD");
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// X-RADICALE-NAME is used by radicale, because hrefs don't really exist in their filesystem backend
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component.remove("X-RADICALE-NAME");
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// Apparently this is set by Horde?
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// https://github.com/pimutils/vdirsyncer/issues/318
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component.remove("X-WR-CALNAME");
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// Those are from the VCARD specification and is supposed to change when the
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// item does -- however, we can determine that ourselves
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component.remove("REV");
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component.remove("LAST-MODIFIED");
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component.remove("CREATED");
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// Some iCalendar HTTP calendars generate the DTSTAMP at request time, so
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// this property always changes when the rest of the item didn't. Some do
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// the same with the UID.
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//
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// - Google's read-only calendar links
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// - http://www.feiertage-oesterreich.at/
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component.remove("DTSTAMP");
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component.remove("UID");
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if component.name == "VCALENDAR" {
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component.subcomponents.retain(|ref c| c.name != "VTIMEZONE");
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}
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stack.extend(component.subcomponents.iter_mut());
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}
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}
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// FIXME: Possible optimization: Stream component to hasher instead of allocating new string
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let digest = ring::digest::digest(&ring::digest::SHA256, vobject::write_component(&new_c).as_bytes());
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let mut rv = String::new();
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for &byte in digest.as_ref() {
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write!(&mut rv, "{:x}", byte).unwrap();
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}
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rv
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}
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