Add backend

backend/src/auth.rs

@@ -0,0 +1,15 @@
+use anyhow::{anyhow, Result};
+use std::str::FromStr;
+
+use nostr_sdk::nostr::key::PublicKey;
+use nostr_sdk::nostr::nips::nip98::{self, HttpMethod};
+use nostr_sdk::nostr::types::time::Timestamp;
+use nostr_sdk::nostr::types::url::Url;
+
+pub fn verify_nip98(auth_header: &str, url: &str, method: &str) -> Result<PublicKey> {
+    let url = Url::parse(url).map_err(|e| anyhow!(e))?;
+    let method = HttpMethod::from_str(&method.to_uppercase()).map_err(|e| anyhow!(e))?;
+    let now = Timestamp::now();
+
+    nip98::verify_auth_header(auth_header, &url, method, now).map_err(|e| anyhow!(e))
+}