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use token::Token;
use logger::Logger;
use error::{Error, Result, Source};
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::borrow::Cow;
use std::fs;
use std::io::Read;
use walkdir::WalkDir;
use rustc_serialize::base64::{self, ToBase64};
use mime_guess;
#[derive(Debug)]
pub struct ResourceHandler<'r> {
links: HashMap<String, String>,
map_images: bool,
logger: &'r Logger,
base64: bool,
#[doc(hidden)]
pub images: HashMap<String, String>,
}
impl<'r> ResourceHandler<'r> {
pub fn new(logger: &'r Logger) -> ResourceHandler {
ResourceHandler {
links: HashMap::new(),
images: HashMap::new(),
map_images: false,
base64: false,
logger: logger,
}
}
pub fn set_images_mapping(&mut self, b: bool) {
self.map_images = b;
}
pub fn set_base64(&mut self, b: bool) {
self.base64 = b;
}
pub fn map_image<'a, S: Into<Cow<'a, str>>>(&'a mut self,
source: &Source,
file: S)
-> Result<Cow<'a, str>> {
let file = file.into();
if !Self::is_local(file.as_ref()) {
self.logger
.warning(lformat!("Resources: book includes non-local image {file}, which might \
cause problem for proper inclusion.",
file = file));
return Ok(file);
}
if fs::metadata(file.as_ref()).is_err() {
return Err(Error::file_not_found(source, lformat!("image"), format!("{}", file)));
}
if !self.map_images {
return Ok(file);
}
if self.images.contains_key(file.as_ref()) {
return Ok(Cow::Borrowed(self.images.get(file.as_ref()).unwrap()));
}
let dest_file = if !(self.base64) {
if let Some(extension) = Path::new(file.as_ref()).extension() {
format!("images/image_{}.{}",
self.images.len(),
extension.to_string_lossy())
} else {
self.logger
.warning(lformat!("Resources: book includes image {file} which doesn't have \
an extension",
file = file));
format!("images/image_{}", self.images.len())
}
} else {
let mut f = match fs::File::open(file.as_ref()) {
Ok(f) => f,
Err(_) => {
return Err(Error::file_not_found(source,
lformat!("image"),
format!("{}", file)));
}
};
let mut content: Vec<u8> = vec![];
if f.read_to_end(&mut content).is_err() {
self.logger.error(lformat!("Resources: could not read file {file}", file = file));
return Ok(file);
}
let base64 = content.to_base64(base64::STANDARD);
match mime_guess::guess_mime_type_opt(file.as_ref()) {
None => {
self.logger
.error(lformat!("Resources: could not guess mime type of file {file}",
file = file));
return Ok(file);
}
Some(s) => format!("data:{};base64,{}", s.to_string(), base64),
}
};
self.images.insert(file.into_owned(), dest_file.clone());
Ok(Cow::Owned(dest_file))
}
#[doc(hidden)]
pub fn images_mapping(&self) -> &HashMap<String, String> {
&self.images
}
pub fn add_link<S: Into<String>>(&mut self, from: S, to: S) {
self.links.insert(from.into(), to.into());
}
pub fn get_link<'a>(&'a self, from: &'a str) -> &'a str {
if let Some(link) = self.links.get(from) {
link
} else {
self.logger.error(lformat!("Resources: could not find a in-book match for link \
{file}",
file = from));
from
}
}
pub fn is_local(path: &str) -> bool {
!path.contains("://")
}
pub fn add_offset(link_offset: &Path, image_offset: &Path, ast: &mut [Token]) {
if link_offset == Path::new("") && image_offset == Path::new("") {
return;
}
for mut token in ast {
match *token {
Token::Link(ref mut url, _, ref mut v) => {
if ResourceHandler::is_local(url) {
let new_url = format!("{}", link_offset.join(&url).display());
*url = new_url;
}
Self::add_offset(link_offset, image_offset, v);
}
Token::Image(ref mut url, _, ref mut v) |
Token::StandaloneImage(ref mut url, _, ref mut v) => {
if ResourceHandler::is_local(url) {
let new_url = format!("{}", image_offset.join(&url).display());
*url = new_url;
}
Self::add_offset(link_offset, image_offset, v);
}
_ => {
if let Some(ref mut inner) = token.inner_mut() {
Self::add_offset(link_offset, image_offset, inner);
}
}
}
}
}
}
pub fn get_files(list: Vec<String>, base: &str) -> Result<Vec<String>> {
let mut out: Vec<String> = vec![];
let base = Path::new(base);
for path in list.into_iter() {
let abs_path = base.join(&path);
let res = fs::metadata(&abs_path);
match res {
Err(err) => {
return Err(Error::render(Source::empty(),
lformat!("error reading file {file}: {error}",
file = abs_path.display(),
error = err)))
}
Ok(metadata) => {
if metadata.is_file() {
out.push(path);
} else if metadata.is_dir() {
let files = WalkDir::new(&abs_path)
.follow_links(true)
.into_iter()
.filter_map(|e| e.ok())
.filter(|e| e.file_type().is_file())
.map(|e| {
PathBuf::from(e.path()
.strip_prefix(base)
.unwrap())
});
for file in files {
out.push(file.to_string_lossy().into_owned());
}
} else {
return Err(Error::render(Source::empty(),
lformat!("error in epub rendering: {path} is \
neither a file nor a directory",
path = &path)));
}
}
}
}
Ok(out)
}