nushell/crates/nu-command/src/commands/autoenv_untrust.rs

use super::autoenv::Trusted;
use crate::prelude::*;
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::SyntaxShape;
use nu_protocol::{Primitive, ReturnSuccess, Signature, UntaggedValue, Value};
use std::io::Read;
use std::{fs, path::PathBuf};
pub struct AutoenvUnTrust;

#[async_trait]
impl WholeStreamCommand for AutoenvUnTrust {
    fn name(&self) -> &str {
        "autoenv untrust"
    }

    fn signature(&self) -> Signature {
        Signature::build("autoenv untrust").optional(
            "dir",
            SyntaxShape::String,
            "Directory to disallow",
        )
    }

    fn usage(&self) -> &str {
        "Untrust a .nu-env file in the current or given directory"
    }

    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let tag = args.call_info.name_tag.clone();
        let ctx = EvaluationContext::from_args(&args);
        let file_to_untrust = match args.call_info.evaluate(&ctx).await?.args.nth(0) {
            Some(Value {
                value: UntaggedValue::Primitive(Primitive::String(ref path)),
                tag: _,
            }) => {
                let mut dir = fs::canonicalize(path)?;
                dir.push(".nu-env");
                dir
            }
            _ => {
                let mut dir = std::env::current_dir()?;
                dir.push(".nu-env");
                dir
            }
        };

        let config_path = config::default_path_for(&Some(PathBuf::from("nu-env.toml")))?;

        let mut file = match std::fs::OpenOptions::new()
            .read(true)
            .create(true)
            .write(true)
            .open(config_path.clone())
        {
            Ok(p) => p,
            Err(_) => {
                return Err(ShellError::untagged_runtime_error(
                    "Couldn't open nu-env.toml",
                ));
            }
        };

        let mut doc = String::new();
        file.read_to_string(&mut doc)?;

        let mut allowed: Trusted = toml::from_str(doc.as_str()).unwrap_or_else(|_| Trusted::new());

        let file_to_untrust = file_to_untrust.to_string_lossy().to_string();

        if allowed.files.remove(&file_to_untrust).is_none() {
            return
                Err(ShellError::untagged_runtime_error(
                    "No .nu-env file to untrust in the given directory. Is it missing, or already untrusted?",
                ));
        }

        let tomlstr = toml::to_string(&allowed).map_err(|_| {
            ShellError::untagged_runtime_error("Couldn't serialize allowed dirs to nu-env.toml")
        })?;
        fs::write(config_path, tomlstr).expect("Couldn't write to toml file");

        Ok(OutputStream::one(ReturnSuccess::value(
            UntaggedValue::string(".nu-env untrusted!").into_value(tag),
        )))
    }
    fn is_binary(&self) -> bool {
        false
    }
    fn examples(&self) -> Vec<Example> {
        vec![
            Example {
                description: "Disallow .nu-env file in current directory",
                example: "autoenv untrust",
                result: None,
            },
            Example {
                description: "Disallow .nu-env file in directory foo",
                example: "autoenv untrust foo",
                result: None,
            },
        ]
    }
}