Add permissions.request (#3296)

cli/js/dispatch.ts

@@ -38,6 +38,7 @@ export let OP_GLOBAL_TIMER: number;
 export let OP_NOW: number;
 export let OP_QUERY_PERMISSION: number;
 export let OP_REVOKE_PERMISSION: number;
+export let OP_REQUEST_PERMISSION: number;
 export let OP_CREATE_WORKER: number;
 export let OP_HOST_GET_WORKER_CLOSED: number;
 export let OP_HOST_POST_MESSAGE: number;

cli/js/lib.deno_runtime.d.ts

@@ -933,6 +933,15 @@ declare namespace Deno {
      *       assert(status.state !== "granted")
      */
     revoke(d: PermissionDescriptor): Promise<PermissionStatus>;
+    /** Requests the permission.
+     *       const status = await Deno.permissions.request({ name: "env" });
+     *       if (status.state === "granted") {
+     *         console.log(Deno.homeDir());
+     *       } else {
+     *         console.log("'env' permission is denied.");
+     *       }
+     */
+    request(desc: PermissionDescriptor): Promise<PermissionStatus>;
   }
   export const permissions: Permissions;
 

cli/js/permissions.ts

@@ -68,6 +68,19 @@ export class Permissions {
     const { state } = sendSync(dispatch.OP_REVOKE_PERMISSION, desc);
     return new PermissionStatus(state);
   }
+
+  /** Requests the permission.
+   *       const status = await Deno.permissions.request({ name: "env" });
+   *       if (status.state === "granted") {
+   *         console.log(Deno.homeDir());
+   *       } else {
+   *         console.log("'env' permission is denied.");
+   *       }
+   */
+  async request(desc: PermissionDescriptor): Promise<PermissionStatus> {
+    const { state } = sendSync(dispatch.OP_REQUEST_PERMISSION, desc);
+    return new PermissionStatus(state);
+  }
 }
 
 export const permissions = new Permissions();

cli/ops/permissions.rs

@@ -1,5 +1,6 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 use super::dispatch_json::{Deserialize, JsonOp, Value};
+use crate::deno_error::type_error;
 use crate::ops::json_op;
 use crate::state::ThreadSafeState;
 use deno::*;
@@ -13,6 +14,10 @@ pub fn init(i: &mut Isolate, s: &ThreadSafeState) {
     "revoke_permission",
     s.core_op(json_op(s.stateful_op(op_revoke_permission))),
   );
+  i.register_op(
+    "request_permission",
+    s.core_op(json_op(s.stateful_op(op_request_permission))),
+  );
 }
 
 #[derive(Deserialize)]
@@ -58,3 +63,31 @@ pub fn op_revoke_permission(
   )?;
   Ok(JsonOp::Sync(json!({ "state": perm.to_string() })))
 }
+
+pub fn op_request_permission(
+  state: &ThreadSafeState,
+  args: Value,
+  _zero_copy: Option<PinnedBuf>,
+) -> Result<JsonOp, ErrBox> {
+  let args: PermissionArgs = serde_json::from_value(args)?;
+  let perm = match args.name.as_ref() {
+    "run" => Ok(state.permissions.request_run()),
+    "read" => Ok(
+      state
+        .permissions
+        .request_read(&args.path.as_ref().map(String::as_str)),
+    ),
+    "write" => Ok(
+      state
+        .permissions
+        .request_write(&args.path.as_ref().map(String::as_str)),
+    ),
+    "net" => state
+      .permissions
+      .request_net(&args.url.as_ref().map(String::as_str)),
+    "env" => Ok(state.permissions.request_env()),
+    "hrtime" => Ok(state.permissions.request_hrtime()),
+    n => Err(type_error(format!("No such permission name: {}", n))),
+  }?;
+  Ok(JsonOp::Sync(json!({ "state": perm.to_string() })))
+}

cli/permissions.rs

@@ -2,11 +2,17 @@
 use crate::deno_error::{permission_denied_msg, type_error};
 use crate::flags::DenoFlags;
 use ansi_term::Style;
+#[cfg(not(test))]
+use atty;
 use deno::ErrBox;
 use log;
 use std::collections::HashSet;
 use std::fmt;
+#[cfg(not(test))]
+use std::io;
 use std::path::PathBuf;
+#[cfg(test)]
+use std::sync::atomic::AtomicBool;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
 use url::Url;
@@ -14,13 +20,24 @@ use url::Url;
 const PERMISSION_EMOJI: &str = "⚠️";
 
 /// Tri-state value for storing permission state
-#[derive(PartialEq)]
+#[derive(PartialEq, Debug)]
 pub enum PermissionAccessorState {
   Allow = 0,
   Ask = 1,
   Deny = 2,
 }
 
+impl PermissionAccessorState {
+  /// Checks the permission state and returns the result.
+  pub fn check(self, msg: &str, err_msg: &str) -> Result<(), ErrBox> {
+    if self == PermissionAccessorState::Allow {
+      log_perm_access(msg);
+      return Ok(());
+    }
+    Err(permission_denied_msg(err_msg.to_string()))
+  }
+}
+
 impl From<usize> for PermissionAccessorState {
   fn from(val: usize) -> Self {
     match val {
@@ -64,28 +81,31 @@ impl PermissionAccessor {
     }
   }
 
-  pub fn is_allow(&self) -> bool {
-    match self.get_state() {
-      PermissionAccessorState::Allow => true,
-      _ => false,
-    }
-  }
-
   /// If the state is "Allow" walk it back to the default "Ask"
   /// Don't do anything if state is "Deny"
   pub fn revoke(&self) {
     if self.is_allow() {
-      self.ask();
-    }
-  }
-
-  pub fn allow(&self) {
-    self.set_state(PermissionAccessorState::Allow)
-  }
-
-  pub fn ask(&self) {
       self.set_state(PermissionAccessorState::Ask)
     }
+  }
+
+  /// Requests the permission.
+  pub fn request(&self, msg: &str) -> PermissionAccessorState {
+    let state = self.get_state();
+    if state != PermissionAccessorState::Ask {
+      return state;
+    }
+    self.set_state(if permission_prompt(msg) {
+      PermissionAccessorState::Allow
+    } else {
+      PermissionAccessorState::Deny
+    });
+    self.get_state()
+  }
+
+  pub fn is_allow(&self) -> bool {
+    self.get_state() == PermissionAccessorState::Allow
+  }
 
   #[inline]
   pub fn get_state(&self) -> PermissionAccessorState {
@@ -141,23 +161,8 @@ impl DenoPermissions {
     }
   }
 
-  /** Checks the permission state and returns the result. */
-  fn check_permission_state(
-    &self,
-    state: PermissionAccessorState,
-    msg: &str,
-    err_msg: &str,
-  ) -> Result<(), ErrBox> {
-    if state == PermissionAccessorState::Allow {
-      self.log_perm_access(msg);
-      return Ok(());
-    }
-    Err(permission_denied_msg(err_msg.to_string()))
-  }
-
   pub fn check_run(&self) -> Result<(), ErrBox> {
-    self.check_permission_state(
-      self.allow_run.get_state(),
+    self.allow_run.get_state().check(
       "access to run a subprocess",
       "run again with the --allow-run flag",
     )
@@ -171,8 +176,7 @@ impl DenoPermissions {
   }
 
   pub fn check_read(&self, filename: &str) -> Result<(), ErrBox> {
-    self.check_permission_state(
-      self.get_state_read(&Some(filename)),
+    self.get_state_read(&Some(filename)).check(
       &format!("read access to \"{}\"", filename),
       "run again with the --allow-read flag",
     )
@@ -189,8 +193,7 @@ impl DenoPermissions {
   }
 
   pub fn check_write(&self, filename: &str) -> Result<(), ErrBox> {
-    self.check_permission_state(
-      self.get_state_write(&Some(filename)),
+    self.get_state_write(&Some(filename)).check(
       &format!("write access to \"{}\"", filename),
       "run again with the --allow-write flag",
     )
@@ -207,39 +210,94 @@ impl DenoPermissions {
     self.allow_net.get_state()
   }
 
+  fn get_state_net_url(
+    &self,
+    url: &Option<&str>,
+  ) -> Result<PermissionAccessorState, ErrBox> {
+    if url.is_none() {
+      return Ok(self.allow_net.get_state());
+    }
+    let url: &str = url.unwrap();
+    // If url is invalid, then throw a TypeError.
+    let parsed = Url::parse(url)
+      .map_err(|_| type_error(format!("Invalid url: {}", url)))?;
+    Ok(
+      self.get_state_net(&format!("{}", parsed.host().unwrap()), parsed.port()),
+    )
+  }
+
   pub fn check_net(&self, hostname: &str, port: u16) -> Result<(), ErrBox> {
-    self.check_permission_state(
-      self.get_state_net(hostname, Some(port)),
+    self.get_state_net(hostname, Some(port)).check(
       &format!("network access to \"{}:{}\"", hostname, port),
       "run again with the --allow-net flag",
     )
   }
 
   pub fn check_net_url(&self, url: &url::Url) -> Result<(), ErrBox> {
-    self.check_permission_state(
-      self.get_state_net(&format!("{}", url.host().unwrap()), url.port()),
+    self
+      .get_state_net(&format!("{}", url.host().unwrap()), url.port())
+      .check(
         &format!("network access to \"{}\"", url),
         "run again with the --allow-net flag",
       )
   }
 
   pub fn check_env(&self) -> Result<(), ErrBox> {
-    self.check_permission_state(
-      self.allow_env.get_state(),
+    self.allow_env.get_state().check(
       "access to environment variables",
       "run again with the --allow-env flag",
     )
   }
 
-  fn log_perm_access(&self, message: &str) {
-    if log_enabled!(log::Level::Info) {
-      eprintln!(
-        "{}",
-        Style::new()
-          .bold()
-          .paint(format!("{}️  Granted {}", PERMISSION_EMOJI, message))
-      );
+  pub fn request_run(&self) -> PermissionAccessorState {
+    self
+      .allow_run
+      .request("Deno requests to access to run a subprocess.")
   }
+
+  pub fn request_read(&self, path: &Option<&str>) -> PermissionAccessorState {
+    if check_path_white_list(path, &self.read_whitelist) {
+      return PermissionAccessorState::Allow;
+    };
+    self.allow_write.request(&match path {
+      None => "Deno requests read access.".to_string(),
+      Some(path) => format!("Deno requests read access to \"{}\".", path),
+    })
+  }
+
+  pub fn request_write(&self, path: &Option<&str>) -> PermissionAccessorState {
+    if check_path_white_list(path, &self.write_whitelist) {
+      return PermissionAccessorState::Allow;
+    };
+    self.allow_write.request(&match path {
+      None => "Deno requests write access.".to_string(),
+      Some(path) => format!("Deno requests write access to \"{}\".", path),
+    })
+  }
+
+  pub fn request_net(
+    &self,
+    url: &Option<&str>,
+  ) -> Result<PermissionAccessorState, ErrBox> {
+    if self.get_state_net_url(url)? == PermissionAccessorState::Ask {
+      return Ok(self.allow_run.request(&match url {
+        None => "Deno requests network access.".to_string(),
+        Some(url) => format!("Deno requests network access to \"{}\".", url),
+      }));
+    };
+    self.get_state_net_url(url)
+  }
+
+  pub fn request_env(&self) -> PermissionAccessorState {
+    self
+      .allow_env
+      .request("Deno requests to access to environment variables.")
+  }
+
+  pub fn request_hrtime(&self) -> PermissionAccessorState {
+    self
+      .allow_hrtime
+      .request("Deno requests to access to high precision time.")
   }
 
   pub fn get_permission_state(
@@ -252,19 +310,7 @@ impl DenoPermissions {
       "run" => Ok(self.allow_run.get_state()),
       "read" => Ok(self.get_state_read(path)),
       "write" => Ok(self.get_state_write(path)),
-      "net" => {
-        // If url is not given, then just check the entire net permission
-        if url.is_none() {
-          return Ok(self.allow_net.get_state());
-        }
-        let url: &str = url.unwrap();
-        // If url is invalid, then throw a TypeError.
-        let parsed = Url::parse(url)
-          .map_err(|_| type_error(format!("Invalid url: {}", url)))?;
-        let state = self
-          .get_state_net(&format!("{}", parsed.host().unwrap()), parsed.port());
-        Ok(state)
-      }
+      "net" => self.get_state_net_url(url),
       "env" => Ok(self.allow_env.get_state()),
       "hrtime" => Ok(self.allow_hrtime.get_state()),
       n => Err(type_error(format!("No such permission name: {}", n))),
@@ -272,6 +318,66 @@ impl DenoPermissions {
   }
 }
 
+/// Shows the permission prompt and returns the answer according to the user input.
+/// This loops until the user gives the proper input.
+#[cfg(not(test))]
+fn permission_prompt(message: &str) -> bool {
+  if !atty::is(atty::Stream::Stdin) || !atty::is(atty::Stream::Stderr) {
+    return false;
+  };
+  let msg = format!(
+    "️{}  {}. Grant? [g/d (g = grant, d = deny)] ",
+    PERMISSION_EMOJI, message
+  );
+  // print to stderr so that if deno is > to a file this is still displayed.
+  eprint!("{}", Style::new().bold().paint(msg));
+  loop {
+    let mut input = String::new();
+    let stdin = io::stdin();
+    let result = stdin.read_line(&mut input);
+    if result.is_err() {
+      return false;
+    };
+    let ch = input.chars().next().unwrap();
+    match ch.to_ascii_lowercase() {
+      'g' => return true,
+      'd' => return false,
+      _ => {
+        // If we don't get a recognized option try again.
+        let msg_again =
+          format!("Unrecognized option '{}' [g/d (g = grant, d = deny)] ", ch);
+        eprint!("{}", Style::new().bold().paint(msg_again));
+      }
+    };
+  }
+}
+
+#[cfg(test)]
+static STUB_PROMPT_VALUE: AtomicBool = AtomicBool::new(true);
+
+#[cfg(test)]
+fn set_prompt_result(value: bool) {
+  STUB_PROMPT_VALUE.store(value, Ordering::SeqCst);
+}
+
+// When testing, permission prompt returns the value of STUB_PROMPT_VALUE
+// which we set from the test functions.
+#[cfg(test)]
+fn permission_prompt(_message: &str) -> bool {
+  STUB_PROMPT_VALUE.load(Ordering::SeqCst)
+}
+
+fn log_perm_access(message: &str) {
+  if log_enabled!(log::Level::Info) {
+    eprintln!(
+      "{}",
+      Style::new()
+        .bold()
+        .paint(format!("{}️  Granted {}", PERMISSION_EMOJI, message))
+    );
+  }
+}
+
 fn check_path_white_list(
   filename: &Option<&str>,
   white_list: &Arc<HashSet<String>>,
@@ -435,4 +541,171 @@ mod tests {
       assert_eq!(*is_ok, perms.check_net(host, *port).is_ok());
     }
   }
+
+  #[test]
+  fn test_permissions_request_run() {
+    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+      ..Default::default()
+    });
+    set_prompt_result(true);
+    assert_eq!(perms0.request_run(), PermissionAccessorState::Allow);
+
+    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    assert_eq!(perms1.request_run(), PermissionAccessorState::Deny);
+  }
+
+  #[test]
+  fn test_permissions_request_read() {
+    let whitelist = svec!["/foo/bar"];
+    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+      read_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    // If the whitelist contains the path, then the result is `allow`
+    // regardless of prompt result
+    assert_eq!(
+      perms0.request_read(&Some("/foo/bar")),
+      PermissionAccessorState::Allow
+    );
+
+    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+      read_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(true);
+    assert_eq!(
+      perms1.request_read(&Some("/foo/baz")),
+      PermissionAccessorState::Allow
+    );
+
+    let perms2 = DenoPermissions::from_flags(&DenoFlags {
+      read_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    assert_eq!(
+      perms2.request_read(&Some("/foo/baz")),
+      PermissionAccessorState::Deny
+    );
+  }
+
+  #[test]
+  fn test_permissions_request_write() {
+    let whitelist = svec!["/foo/bar"];
+    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+      write_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    // If the whitelist contains the path, then the result is `allow`
+    // regardless of prompt result
+    assert_eq!(
+      perms0.request_write(&Some("/foo/bar")),
+      PermissionAccessorState::Allow
+    );
+
+    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+      write_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(true);
+    assert_eq!(
+      perms1.request_write(&Some("/foo/baz")),
+      PermissionAccessorState::Allow
+    );
+
+    let perms2 = DenoPermissions::from_flags(&DenoFlags {
+      write_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    assert_eq!(
+      perms2.request_write(&Some("/foo/baz")),
+      PermissionAccessorState::Deny
+    );
+  }
+
+  #[test]
+  fn test_permission_request_net() {
+    let whitelist = svec!["localhost:8080"];
+
+    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+      net_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    // If the url matches the whitelist item, then the result is `allow`
+    // regardless of prompt result
+    assert_eq!(
+      perms0
+        .request_net(&Some("http://localhost:8080/"))
+        .expect("Testing expect"),
+      PermissionAccessorState::Allow
+    );
+
+    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+      net_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(true);
+    assert_eq!(
+      perms1
+        .request_net(&Some("http://deno.land/"))
+        .expect("Testing expect"),
+      PermissionAccessorState::Allow
+    );
+
+    let perms2 = DenoPermissions::from_flags(&DenoFlags {
+      net_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    assert_eq!(
+      perms2
+        .request_net(&Some("http://deno.land/"))
+        .expect("Testing expect"),
+      PermissionAccessorState::Deny
+    );
+
+    let perms3 = DenoPermissions::from_flags(&DenoFlags {
+      net_whitelist: whitelist.clone(),
+      ..Default::default()
+    });
+    set_prompt_result(true);
+    assert!(perms3.request_net(&Some(":")).is_err());
+  }
+
+  #[test]
+  fn test_permissions_request_env() {
+    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+      ..Default::default()
+    });
+    set_prompt_result(true);
+    assert_eq!(perms0.request_env(), PermissionAccessorState::Allow);
+
+    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    assert_eq!(perms1.request_env(), PermissionAccessorState::Deny);
+  }
+
+  #[test]
+  fn test_permissions_request_hrtime() {
+    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+      ..Default::default()
+    });
+    set_prompt_result(true);
+    assert_eq!(perms0.request_hrtime(), PermissionAccessorState::Allow);
+
+    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+      ..Default::default()
+    });
+    set_prompt_result(false);
+    assert_eq!(perms1.request_hrtime(), PermissionAccessorState::Deny);
+  }
 }