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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
use atty;
use crate::flags::DenoFlags;
use ansi_term::Style;
use crate::errors::permission_denied;
use crate::errors::DenoResult;
use std::io;
use std::sync::atomic::{AtomicBool, Ordering};
#[cfg_attr(feature = "cargo-clippy", allow(stutter))]
#[derive(Debug, Default)]
pub struct DenoPermissions {
// Keep in sync with src/permissions.ts
pub allow_read: AtomicBool,
pub allow_write: AtomicBool,
pub allow_net: AtomicBool,
pub allow_env: AtomicBool,
pub allow_run: AtomicBool,
pub no_prompts: AtomicBool,
}
impl DenoPermissions {
pub fn from_flags(flags: &DenoFlags) -> Self {
Self {
allow_read: AtomicBool::new(flags.allow_read),
allow_write: AtomicBool::new(flags.allow_write),
allow_env: AtomicBool::new(flags.allow_env),
allow_net: AtomicBool::new(flags.allow_net),
allow_run: AtomicBool::new(flags.allow_run),
no_prompts: AtomicBool::new(flags.no_prompts),
}
}
pub fn check_run(&self) -> DenoResult<()> {
if self.allow_run.load(Ordering::SeqCst) {
return Ok(());
};
// TODO get location (where access occurred)
let r = self.try_permissions_prompt("access to run a subprocess");
if r.is_ok() {
self.allow_run.store(true, Ordering::SeqCst);
}
r
}
pub fn check_read(&self, filename: &str) -> DenoResult<()> {
if self.allow_read.load(Ordering::SeqCst) {
return Ok(());
};
// TODO get location (where access occurred)
let r =
self.try_permissions_prompt(&format!("read access to \"{}\"", filename));;
if r.is_ok() {
self.allow_read.store(true, Ordering::SeqCst);
}
r
}
pub fn check_write(&self, filename: &str) -> DenoResult<()> {
if self.allow_write.load(Ordering::SeqCst) {
return Ok(());
};
// TODO get location (where access occurred)
let r =
self.try_permissions_prompt(&format!("write access to \"{}\"", filename));;
if r.is_ok() {
self.allow_write.store(true, Ordering::SeqCst);
}
r
}
pub fn check_net(&self, domain_name: &str) -> DenoResult<()> {
if self.allow_net.load(Ordering::SeqCst) {
return Ok(());
};
// TODO get location (where access occurred)
let r = self.try_permissions_prompt(&format!(
"network access to \"{}\"",
domain_name
));
if r.is_ok() {
self.allow_net.store(true, Ordering::SeqCst);
}
r
}
pub fn check_env(&self) -> DenoResult<()> {
if self.allow_env.load(Ordering::SeqCst) {
return Ok(());
};
// TODO get location (where access occurred)
let r = self.try_permissions_prompt(&"access to environment variables");
if r.is_ok() {
self.allow_env.store(true, Ordering::SeqCst);
}
r
}
/// Try to present the user with a permission prompt
/// will error with permission_denied if no_prompts is enabled
fn try_permissions_prompt(&self, message: &str) -> DenoResult<()> {
if self.no_prompts.load(Ordering::SeqCst) {
return Err(permission_denied());
}
permission_prompt(message)
}
pub fn allows_run(&self) -> bool {
return self.allow_run.load(Ordering::SeqCst);
}
pub fn allows_read(&self) -> bool {
return self.allow_read.load(Ordering::SeqCst);
}
pub fn allows_write(&self) -> bool {
return self.allow_write.load(Ordering::SeqCst);
}
pub fn allows_net(&self) -> bool {
return self.allow_net.load(Ordering::SeqCst);
}
pub fn allows_env(&self) -> bool {
return self.allow_env.load(Ordering::SeqCst);
}
pub fn revoke_run(&self) -> DenoResult<()> {
self.allow_run.store(false, Ordering::SeqCst);
return Ok(());
}
pub fn revoke_read(&self) -> DenoResult<()> {
self.allow_read.store(false, Ordering::SeqCst);
return Ok(());
}
pub fn revoke_write(&self) -> DenoResult<()> {
self.allow_write.store(false, Ordering::SeqCst);
return Ok(());
}
pub fn revoke_net(&self) -> DenoResult<()> {
self.allow_net.store(false, Ordering::SeqCst);
return Ok(());
}
pub fn revoke_env(&self) -> DenoResult<()> {
self.allow_env.store(false, Ordering::SeqCst);
return Ok(());
}
pub fn default() -> Self {
Self {
allow_read: AtomicBool::new(false),
allow_write: AtomicBool::new(false),
allow_env: AtomicBool::new(false),
allow_net: AtomicBool::new(false),
allow_run: AtomicBool::new(false),
..Default::default()
}
}
}
fn permission_prompt(message: &str) -> DenoResult<()> {
if !atty::is(atty::Stream::Stdin) || !atty::is(atty::Stream::Stderr) {
return Err(permission_denied());
};
let msg = format!("⚠️ Deno requests {}. Grant? [yN] ", message);
// print to stderr so that if deno is > to a file this is still displayed.
eprint!("{}", Style::new().bold().paint(msg));
let mut input = String::new();
let stdin = io::stdin();
let _nread = stdin.read_line(&mut input)?;
let ch = input.chars().next().unwrap();
let is_yes = ch == 'y' || ch == 'Y';
if is_yes {
Ok(())
} else {
Err(permission_denied())
}
}
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