split notedeck into crates

This splits notedeck into crates, separating the browser chrome and
individual apps:

* notedeck: binary file, browser chrome
* notedeck_columns: our columns app
* enostr: same as before

We still need to do more work to cleanly separate the chrome apis
from the app apis. Soon I will create notedeck-notebook to see what
makes sense to be shared between the apps.

Some obvious ones that come to mind:

1. ImageCache

We will likely want to move this to the notedeck crate, as most apps
will want some kind of image cache. In web browsers, web pages do not
need to worry about this, so we will likely have to do something similar

2. Ndb

Since NdbRef is threadsafe and Ndb is an Arc<NdbRef>, it can be safely
copied to each app. This will simplify things. In the future we might
want to create an abstraction over this? Maybe each app shouldn't have
access to the same database... we assume the data in DBs are all public
anyways, but if we have unwrapped giftwraps that could be a problem.

3. RelayPool / Subscription Manager

The browser should probably maintain these. Then apps can use ken's
high level subscription manager api and not have to worry about
connection pool details

4. Accounts

Accounts and key management should be handled by the chrome. Apps should
only have a simple signer interface.

That's all for now, just something to think about!

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_columns/src/key_parsing.rs

@@ -0,0 +1,220 @@
+use std::collections::HashMap;
+use std::str::FromStr;
+
+use crate::Error;
+use enostr::{Keypair, Pubkey, SecretKey};
+use poll_promise::Promise;
+use reqwest::{Request, Response};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, PartialEq)]
+pub enum AcquireKeyError {
+    InvalidKey,
+    Nip05Failed(String),
+}
+
+impl std::fmt::Display for AcquireKeyError {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self {
+            AcquireKeyError::InvalidKey => write!(f, "The inputted key is invalid."),
+            AcquireKeyError::Nip05Failed(e) => {
+                write!(f, "Failed to get pubkey from Nip05 address: {e}")
+            }
+        }
+    }
+}
+
+impl std::error::Error for AcquireKeyError {}
+
+#[derive(Deserialize, Serialize)]
+pub struct Nip05Result {
+    pub names: HashMap<String, String>,
+    pub relays: Option<HashMap<String, Vec<String>>>,
+}
+
+async fn parse_nip05_response(response: Response) -> Result<Nip05Result, Error> {
+    match response.bytes().await {
+        Ok(bytes) => {
+            serde_json::from_slice::<Nip05Result>(&bytes).map_err(|e| Error::Generic(e.to_string()))
+        }
+        Err(e) => Err(Error::Generic(e.to_string())),
+    }
+}
+
+fn get_pubkey_from_result(result: Nip05Result, user: String) -> Result<Pubkey, Error> {
+    match result.names.get(&user).to_owned() {
+        Some(pubkey_str) => Pubkey::from_hex(pubkey_str).map_err(|e| {
+            Error::Generic("Could not parse pubkey: ".to_string() + e.to_string().as_str())
+        }),
+        None => Err(Error::Generic("Could not find user in json.".to_string())),
+    }
+}
+
+async fn get_nip05_pubkey(id: &str) -> Result<Pubkey, Error> {
+    let mut parts = id.split('@');
+
+    let user = match parts.next() {
+        Some(user) => user,
+        None => {
+            return Err(Error::Generic(
+                "Address does not contain username.".to_string(),
+            ));
+        }
+    };
+    let host = match parts.next() {
+        Some(host) => host,
+        None => {
+            return Err(Error::Generic(
+                "Nip05 address does not contain host.".to_string(),
+            ));
+        }
+    };
+
+    if parts.next().is_some() {
+        return Err(Error::Generic(
+            "Nip05 address contains extraneous parts.".to_string(),
+        ));
+    }
+
+    let url = format!("https://{host}/.well-known/nostr.json?name={user}");
+    let request = Request::new(reqwest::Method::GET, url.parse().unwrap());
+    let cloned_user = user.to_string();
+
+    let client = reqwest::Client::new();
+    match client.execute(request).await {
+        Ok(resp) => match parse_nip05_response(resp).await {
+            Ok(result) => match get_pubkey_from_result(result, cloned_user) {
+                Ok(pubkey) => Ok(pubkey),
+                Err(e) => Err(Error::Generic(e.to_string())),
+            },
+            Err(e) => Err(Error::Generic(e.to_string())),
+        },
+        Err(e) => Err(Error::Generic(e.to_string())),
+    }
+}
+
+fn retrieving_nip05_pubkey(key: &str) -> bool {
+    key.contains('@')
+}
+
+pub fn perform_key_retrieval(key: &str) -> Promise<Result<Keypair, AcquireKeyError>> {
+    let key_string = String::from(key);
+    Promise::spawn_async(async move { get_key(&key_string).await })
+}
+
+/// Attempts to turn a string slice key from the user into a Nostr-Sdk Keypair object.
+/// The `key` can be in any of the following formats:
+/// - Public Bech32 key (prefix "npub"): "npub1xyz..."
+/// - Private Bech32 key (prefix "nsec"): "nsec1xyz..."
+/// - Public hex key: "02a1..."
+/// - Private hex key: "5dab..."
+/// - NIP-05 address: "example@nostr.com"
+///
+pub async fn get_key(key: &str) -> Result<Keypair, AcquireKeyError> {
+    let tmp_key: &str = if let Some(stripped) = key.strip_prefix('@') {
+        stripped
+    } else {
+        key
+    };
+
+    if retrieving_nip05_pubkey(tmp_key) {
+        match get_nip05_pubkey(tmp_key).await {
+            Ok(pubkey) => Ok(Keypair::only_pubkey(pubkey)),
+            Err(e) => Err(AcquireKeyError::Nip05Failed(e.to_string())),
+        }
+    } else if let Ok(pubkey) = Pubkey::try_from_bech32_string(tmp_key, true) {
+        Ok(Keypair::only_pubkey(pubkey))
+    } else if let Ok(pubkey) = Pubkey::try_from_hex_str_with_verify(tmp_key) {
+        Ok(Keypair::only_pubkey(pubkey))
+    } else if let Ok(secret_key) = SecretKey::from_str(tmp_key) {
+        Ok(Keypair::from_secret(secret_key))
+    } else {
+        Err(AcquireKeyError::InvalidKey)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::promise_assert;
+
+    #[tokio::test]
+    async fn test_pubkey_async() {
+        let pubkey_str = "npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s";
+        let expected_pubkey =
+            Pubkey::try_from_bech32_string(pubkey_str, false).expect("Should not have errored.");
+        let login_key_result = get_key(pubkey_str).await;
+
+        assert_eq!(Ok(Keypair::only_pubkey(expected_pubkey)), login_key_result);
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_pubkey() {
+        let pubkey_str = "npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s";
+        let expected_pubkey =
+            Pubkey::try_from_bech32_string(pubkey_str, false).expect("Should not have errored.");
+        let login_key_result = perform_key_retrieval(pubkey_str);
+
+        promise_assert!(
+            assert_eq,
+            Ok(Keypair::only_pubkey(expected_pubkey)),
+            &login_key_result
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_hex_pubkey() {
+        let pubkey_str = "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245";
+        let expected_pubkey = Pubkey::from_hex(pubkey_str).expect("Should not have errored.");
+        let login_key_result = perform_key_retrieval(pubkey_str);
+
+        promise_assert!(
+            assert_eq,
+            Ok(Keypair::only_pubkey(expected_pubkey)),
+            &login_key_result
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_privkey() {
+        let privkey_str = "nsec1g8wt3hlwjpa4827xylr3r0lccufxltyekhraexes8lqmpp2hensq5aujhs";
+        let expected_privkey = SecretKey::from_str(privkey_str).expect("Should not have errored.");
+        let login_key_result = perform_key_retrieval(privkey_str);
+
+        promise_assert!(
+            assert_eq,
+            Ok(Keypair::from_secret(expected_privkey)),
+            &login_key_result
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_hex_privkey() {
+        let privkey_str = "41dcb8dfee907b53abc627c711bff8c7126fac99b5c7dc9b303fc1b08557cce0";
+        let expected_privkey = SecretKey::from_str(privkey_str).expect("Should not have errored.");
+        let login_key_result = perform_key_retrieval(privkey_str);
+
+        promise_assert!(
+            assert_eq,
+            Ok(Keypair::from_secret(expected_privkey)),
+            &login_key_result
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_nip05() {
+        let nip05_str = "damus@damus.io";
+        let expected_pubkey = Pubkey::try_from_bech32_string(
+            "npub18m76awca3y37hkvuneavuw6pjj4525fw90necxmadrvjg0sdy6qsngq955",
+            false,
+        )
+        .expect("Should not have errored.");
+        let login_key_result = perform_key_retrieval(nip05_str);
+
+        promise_assert!(
+            assert_eq,
+            Ok(Keypair::only_pubkey(expected_pubkey)),
+            &login_key_result
+        );
+    }
+}