fixing code validation, and also added rename instance

src/auth.rs

@@ -114,7 +114,7 @@ fn refresh(agent: &Agent, refresh: &str) -> anyhow::Result<(String, String)> {
 }
 fn poll(agent: &Agent, device: &Device) -> anyhow::Result<(String, String)> {
     println!(
-        "Go to {} and enter code: {}",
+        "Go to {} and enter code: {}.",
         device.verification_uri, device.user_code
     );
     loop {

src/instance.rs

@@ -1,9 +1,10 @@
-use anyhow::Ok;
 use serde::{Deserialize, Serialize};
 use std::{
     fs::create_dir_all,
     path::{Path, PathBuf},
 };
+
+use crate::util::is_valid_name;
 #[derive(Serialize, Deserialize)]
 pub struct Instance {
     pub version: String,
@@ -18,8 +19,8 @@ pub struct Loader {
 }
 
 pub fn create(instances_dir: &Path, name: &str, version: &str) -> anyhow::Result<PathBuf> {
-    if name.contains('/') {
+    if !is_valid_name(name) {
-        anyhow::bail!("unusable characters in path.");
+        anyhow::bail!("invalid instance name: {name:?}");
     }
     let directory = instances_dir.join(name);
     if directory.join("instance.json").exists() {
@@ -63,6 +64,9 @@ pub fn list(root: &Path) -> anyhow::Result<Vec<String>> {
     Ok(out)
 }
 pub fn remove(instances_dir: &Path, name: &str, yes: bool) -> anyhow::Result<()> {
+    if !is_valid_name(name) {
+        anyhow::bail!("invalid instance name: {name:?}");
+    }
     let dir = instances_dir.join(&name);
     if !dir.exists() {
         anyhow::bail!("no instance named {name}");
@@ -77,7 +81,25 @@ pub fn remove(instances_dir: &Path, name: &str, yes: bool) -> anyhow::Result<()>
         }
     }
     std::fs::remove_dir_all(&dir)?;
-    println!("Removed {name}.");
+    Ok(())
+}
+pub fn rename(instances_dir: &Path, old_name: &str, new_name: &str) -> anyhow::Result<()> {
+    if !is_valid_name(old_name) {
+        anyhow::bail!("invalid original instance name: {old_name:?}");
+    }
+    if !is_valid_name(new_name) {
+        anyhow::bail!("invalid new instance name: {new_name:?}");
+    }
+    let instance_dir = instances_dir.join(&old_name);
+    let new_dir = instances_dir.join(&new_name);
+    if !instance_dir.exists() {
+        anyhow::bail!("original instance name doesn't exist");
+    }
+    if new_dir.exists() {
+        anyhow::bail!("new instance name already exists");
+    }
+    std::fs::rename(instance_dir, new_dir)?;
+
     Ok(())
 }
 pub fn sanitize(name: &str) -> String {

src/main.rs

@@ -6,13 +6,18 @@ mod launch;
 mod meta;
 mod mrpack;
 mod prism;
-use crate::{launch::run, meta::fetch_version};
+mod util;
 use clap::{Parser, Subcommand};
+use launch::run;
+use meta::fetch_version;
 use std::path::{Path, PathBuf};
 
 /// Untitled Minecraft Launcher
 #[derive(Parser)]
 #[command(name = "uml")]
+#[command(
+    after_help = "For any instance names with spaces, other than the launch command, enclose it in double quotes."
+)]
 struct Cli {
     #[command(subcommand)]
     command: Command,
@@ -47,6 +52,11 @@ enum InstanceCmd {
         #[arg(long)]
         version: String,
     },
+    /// Rename an instance
+    Rename {
+        current_name: String,
+        new_name: String,
+    },
     /// Import a Modrinth modpack
     Import {
         pack: PathBuf,
@@ -104,6 +114,13 @@ fn main() -> anyhow::Result<()> {
                 }
                 instance::create(&instances_dir, &name, &version)?;
             }
+            InstanceCmd::Rename {
+                current_name,
+                new_name,
+            } => {
+                instance::rename(&instances_dir, &current_name, &new_name)?;
+                println!("Renamed {} to {}.", current_name, new_name);
+            }
             InstanceCmd::Import { pack, name, yes } => {
                 mrpack::import(&pack, &instances_dir, name.as_deref(), yes)?;
             }
@@ -112,6 +129,7 @@ fn main() -> anyhow::Result<()> {
             }
             InstanceCmd::Remove { name, yes } => {
                 instance::remove(&instances_dir, &name, yes)?;
+                println!("Removed {name}.");
             }
             InstanceCmd::List => {
                 for n in instance::list(&instances_dir)? {

src/mrpack.rs

@@ -1,7 +1,7 @@
 use crate::{
-    download::download,
+    download::{download, verify_sha512},
-    download::verify_sha512,
     instance::{Loader, create, load, save},
+    util::is_safe_relative_path,
 };
 use indicatif::{ProgressBar, ProgressStyle};
 use serde::Deserialize;
@@ -51,10 +51,9 @@ fn extract_overrides(
         if rel.is_empty() || entry.is_dir() {
             continue;
         }
-        if rel.contains("..") || rel.starts_with('/') {
+        if !is_safe_relative_path(rel) {
             anyhow::bail!("suspicious path in pack: {name}");
         }
-
         let dest = instance_dir.join(rel);
         if let Some(parent) = dest.parent() {
             std::fs::create_dir_all(parent)?;
@@ -146,7 +145,7 @@ pub fn import(
     pb.set_style(ProgressStyle::with_template("{bar:40} {pos}/{len} {msg}").unwrap());
 
     for f in &wanted {
-        if f.path.contains("..") || f.path.starts_with('/') {
+        if !is_safe_relative_path(&f.path) {
             anyhow::bail!("suspicious path in pack: {}", f.path);
         }
         pb.set_message(f.path.clone());

src/util.rs

@@ -0,0 +1,15 @@
+use std::path::Path;
+
+pub fn is_valid_name(name: &str) -> bool {
+    let mut components = Path::new(name).components();
+    matches!(
+        (components.next(), components.next()),
+        (Some(std::path::Component::Normal(_)), None)
+    )
+}
+pub fn is_safe_relative_path(path: &str) -> bool {
+    let p = Path::new(path);
+    !p.as_os_str().is_empty()
+        && p.components()
+            .all(|c| matches!(c, std::path::Component::Normal(_)))
+}