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use std::path::Path;
use std::path::PathBuf;
use git2::*;
use mime_guess::MimeGuess;
use num_enum::FromPrimitive;
use serde::{Deserialize, Serialize};
use crate::errors::*;
#[derive(Debug, PartialEq, Eq, Clone, FromPrimitive)]
#[repr(isize)]
pub enum GitFileMode {
Empty = 0,
Regular = 0o100644,
Dir = 0o40000,
Deprecated = 0o100664,
Executable = 0o100755,
Symlink = 0o120000,
Submodule = 0o160000,
#[num_enum(default)]
Unsupported = -1,
}
impl From<&'_ TreeEntry<'_>> for GitFileMode {
fn from(t: &TreeEntry) -> Self {
GitFileMode::from(t.filemode() as isize)
}
}
impl From<TreeEntry<'_>> for GitFileMode {
fn from(t: TreeEntry) -> Self {
GitFileMode::from(t.filemode() as isize)
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct FileInfo {
pub filename: String,
pub content: ContentType,
pub mime: MimeGuess,
}
#[derive(Serialize, Eq, PartialEq, Clone, Debug, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum ContentType {
Binary(Vec<u8>),
Text(String),
}
impl ContentType {
pub fn bytes(self) -> Vec<u8> {
match self {
Self::Text(text) => text.into(),
Self::Binary(bin) => bin,
}
}
pub fn from_blob(blob: &git2::Blob) -> Self {
if blob.is_binary() {
Self::Binary(blob.content().to_vec())
} else {
Self::Text(String::from_utf8_lossy(blob.content()).to_string())
}
}
}
pub fn read_file(repo_path: &PathBuf, path: &str) -> ServiceResult<FileInfo> {
let repo = git2::Repository::open(repo_path).unwrap();
let head = repo.head().unwrap();
let tree = head.peel_to_tree().unwrap();
read_file_inner(&repo, path, &tree)
}
pub fn read_preview_file(
repo_path: &PathBuf,
preview_name: &str,
path: &str,
) -> ServiceResult<FileInfo> {
let repo = git2::Repository::open(repo_path).unwrap();
let branch = repo
.find_branch(preview_name, git2::BranchType::Local)
.unwrap();
let branch = branch.into_reference();
let tree = branch.peel_to_tree().unwrap();
read_file_inner(&repo, path, &tree)
}
fn read_file_inner(
repo: &git2::Repository,
path: &str,
tree: &git2::Tree,
) -> ServiceResult<FileInfo> {
fn read_file(id: Oid, repo: &git2::Repository) -> ContentType {
let blob = repo.find_blob(id).unwrap();
ContentType::from_blob(&blob)
}
fn get_index_file(id: Oid, repo: &Repository) -> ContentType {
let tree = repo.find_tree(id).unwrap();
const INDEX_FILES: [&str; 7] = [
"index.html",
"index.md",
"INDEX.md",
"README.md",
"README",
"readme.txt",
"readme",
];
let content = if let Some(index_file) = tree.iter().find(|x| {
if let Some(name) = x.name() {
INDEX_FILES.iter().any(|index_name| *index_name == name)
} else {
false
}
}) {
read_file(index_file.id(), repo)
} else {
unimplemented!("Index file not found");
};
content
}
let inner = |repo: &git2::Repository, tree: &git2::Tree| -> ServiceResult<FileInfo> {
let mut path = path;
if path == "/" {
let content = get_index_file(tree.id(), repo);
return Ok(FileInfo {
filename: "/".into(),
content,
mime: mime_guess::from_path("index.html"),
});
}
if path.starts_with('/') {
path = path.trim_start_matches('/');
}
fn file_not_found(e: git2::Error) -> ServiceError {
if e.code() == ErrorCode::NotFound && e.class() == ErrorClass::Tree {
return ServiceError::FileNotFound;
}
e.into()
}
let entry = tree.get_path(Path::new(path)).map_err(file_not_found)?;
let mode: GitFileMode = entry.clone().into();
if let Some(name) = entry.name() {
let file = match mode {
GitFileMode::Dir => get_index_file(entry.id(), repo),
GitFileMode::Submodule => unimplemented!(),
GitFileMode::Empty => unimplemented!(),
GitFileMode::Deprecated => unimplemented!(),
GitFileMode::Unsupported => unimplemented!(),
GitFileMode::Symlink => unimplemented!(),
GitFileMode::Executable => read_file(entry.id(), repo),
GitFileMode::Regular => read_file(entry.id(), repo),
};
Ok(FileInfo {
filename: name.to_string(),
mime: mime_guess::from_path(path),
content: file,
})
} else {
unimplemented!();
}
};
inner(repo, tree)
}
#[cfg(test)]
pub mod tests {
use super::*;
use mktemp::Temp;
const FILE_CONTENT: &str = "foobar";
pub fn write_file_util(repo_path: &str, file_name: &str, content: Option<&str>) {
let inner = |repo: &mut Repository| -> ServiceResult<()> {
let mut tree_builder = match repo.head() {
Err(_) => repo.treebuilder(None).unwrap(),
Ok(h) => repo.treebuilder(Some(&h.peel_to_tree().unwrap())).unwrap(),
};
let odb = repo.odb().unwrap();
let content = if content.is_some() {
content.as_ref().unwrap()
} else {
FILE_CONTENT
};
let obj = odb.write(ObjectType::Blob, content.as_bytes()).unwrap();
tree_builder.insert(file_name, obj, 0o100644).unwrap();
let tree_hash = tree_builder.write().unwrap();
let author = Signature::now("librepages", "admin@librepages.org").unwrap();
let committer = Signature::now("librepages", "admin@librepages.org").unwrap();
let commit_tree = repo.find_tree(tree_hash).unwrap();
let msg = "";
if let Err(e) = repo.head() {
if e.code() == ErrorCode::UnbornBranch && e.class() == ErrorClass::Reference {
repo.commit(Some("HEAD"), &author, &committer, msg, &commit_tree, &[])
.unwrap();
} else {
panic!("{:?}", e);
}
} else {
let head_ref = repo.head().unwrap();
let head_commit = head_ref.peel_to_commit().unwrap();
repo.commit(
Some("HEAD"),
&author,
&committer,
msg,
&commit_tree,
&[&head_commit],
)
.unwrap();
};
Ok(())
};
if Repository::open(repo_path).is_err() {
let _ = Repository::init(repo_path);
}
let mut repo = Repository::open(repo_path).unwrap();
let _ = inner(&mut repo);
}
#[test]
fn test_git_write_read_works() {
const FILENAME: &str = "README.txt";
let tmp_dir = Temp::new_dir().unwrap();
let path = tmp_dir.to_str().unwrap();
write_file_util(path, FILENAME, None);
let resp = read_file(&Path::new(path).into(), FILENAME).unwrap();
assert_eq!(resp.filename, FILENAME);
assert_eq!(resp.content.bytes(), FILE_CONTENT.as_bytes());
assert_eq!(resp.mime.first().unwrap(), "text/plain");
let resp = read_preview_file(&Path::new(path).into(), "master", FILENAME).unwrap();
assert_eq!(resp.filename, FILENAME);
assert_eq!(resp.content.bytes(), FILE_CONTENT.as_bytes());
assert_eq!(resp.mime.first().unwrap(), "text/plain");
assert_eq!(
read_preview_file(&Path::new(path).into(), "master", "file-does-not-exist.txt"),
Err(ServiceError::FileNotFound)
);
}
}