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|
use std::{
collections::HashMap,
fs::{self, File},
io::{BufRead, BufReader},
path::{Path, PathBuf},
};
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use uuid::Uuid;
use super::PageUuid;
#[derive(Clone, Deserialize, Serialize, Debug)]
pub struct Page {
pub uuid: PageUuid,
pub author: Uuid,
pub title: String,
pub current_version: DateTime<Utc>,
pub prev_versions: Vec<DateTime<Utc>>,
disk_path: PathBuf,
content_offset: usize,
}
pub struct Pages {
pub pages: HashMap<PageUuid, Page>,
}
const METADATA_DIVIDER: &'static str = "<!-- trans rights ~ath&+ -->";
#[cfg(feature = "ssr")]
impl Pages {
pub fn init(pages_dir: &Path) -> Result<Self, String> {
// Read dir
let page_dirs = fs::read_dir(&pages_dir)
.map_err(|_| "Could not open pages data directory".to_string())?;
// Parse each
let pages = page_dirs
.map(|dir_entry| -> Result<Page, String> {
let page_dir_path = dir_entry.as_ref().unwrap().path();
Pages::read_page(&page_dir_path)
})
.collect::<Result<Vec<Page>, String>>()?;
// Build lookup
Ok(Self {
pages: pages
.into_iter()
.map(|page| (page.uuid.clone(), page))
.collect::<HashMap<_, _>>(),
})
}
fn read_page(page_dir: &Path) -> Result<Page, String> {
let current_page = page_dir
.join("current")
.canonicalize()
.map_err(|_| "Could not canonicalize page location".to_string())?;
let mut reader = BufReader::new(
File::open(¤t_page).map_err(|_| "Could not open page file".to_string())?,
);
let page_uuid = PageUuid(
Uuid::try_parse(
&page_dir
.file_name()
.ok_or("Could not read page directory".to_string())?
.to_str()
.unwrap(),
)
.map_err(|_| "Could not parse page UUID".to_string())?,
);
let mut metadata_string = String::new();
let mut current_line = String::new();
let mut content_offset = 0;
'readloop: while let Ok(size) = reader.read_line(&mut current_line) {
content_offset += size;
if size == 0 {
return Err("Page file is invalid".to_string());
}
if current_line.trim() == METADATA_DIVIDER {
break 'readloop;
}
metadata_string.push_str(¤t_line);
current_line.truncate(0);
}
#[derive(Deserialize)]
struct PageMetadata {
title: String,
author: String,
prev_versions: Option<Vec<String>>,
}
let metadata: PageMetadata = toml::from_str(&metadata_string).map_err(|err| {
println!("{err:?}");
"Page metadata is invalid".to_string()
})?;
let current_version = DateTime::parse_from_rfc3339(
current_page
.file_name()
.unwrap()
.to_str()
.unwrap()
.replace("_", ":")
.as_str(),
)
.map_err(|_| "Invalid date format".to_string())?
.to_utc();
let prev_versions = metadata
.prev_versions
.unwrap_or(Vec::new())
.iter()
.filter_map(|str| {
DateTime::parse_from_rfc3339(str.replace("_", ":").as_str())
.ok()
.map(|timestamp| timestamp.to_utc())
})
.collect::<Vec<_>>();
Ok(Page {
uuid: page_uuid,
author: Uuid::try_parse(&metadata.author)
.map_err(|_| "Could not parse author UUID".to_string())?,
title: metadata.title,
current_version,
prev_versions,
disk_path: current_page,
content_offset,
})
}
pub fn get_page(&self, uuid: &PageUuid) -> Option<&Page> {
self.pages.get(uuid)
}
pub fn create_page(&self, page: Page) {
todo!()
}
pub fn update_page(&self, page: Page) {
todo!()
}
pub fn delete_page(&self, uuid: PageUuid) -> Result<(), String> {
todo!()
}
}
#[cfg(feature = "ssr")]
impl Page {
pub async fn read_content(&self) -> Result<String, String> {
use std::io::Read;
let file_meta =
fs::metadata(&self.disk_path).map_err(|_| "Cannot retrieve file size".to_string())?;
let read_length = usize::try_from(file_meta.len())
.map_err(|_| "Cannot get file offset".to_string())?
- self.content_offset;
let mut reader = BufReader::new(
File::open(&self.disk_path).map_err(|_| "Could not open page file".to_string())?,
);
reader
.seek_relative(
i64::try_from(self.content_offset)
.map_err(|_| "Invalid seek length".to_string())?,
)
.map_err(|_| "Could not seek in page file".to_string())?;
let mut contents = String::with_capacity(read_length);
reader
.read_to_string(&mut contents)
.map_err(|_| "Could not read file".to_string())?;
Ok(contents)
}
}
|
