feat: implementation of proposed NIP-11 (server metadata)

src/info.rs

@@ -0,0 +1,61 @@
+use crate::config;
+/// Relay Info
+use serde::{Deserialize, Serialize};
+use serde_json::value::Value;
+
+const CARGO_PKG_VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");
+
+#[derive(Debug, Serialize, Deserialize)]
+#[allow(unused)]
+pub struct RelayInfo {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub descr: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub pubkey: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub email: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub supported_nips: Option<Vec<String>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub software: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub version: Option<String>,
+}
+
+impl Default for RelayInfo {
+    fn default() -> Self {
+        RelayInfo {
+            name: None,
+            descr: None,
+            pubkey: None,
+            email: None,
+            supported_nips: Some(vec!["NIP-01".to_owned()]),
+            software: Some("https://git.sr.ht/~gheartsfield/nostr-rs-relay".to_owned()),
+            version: CARGO_PKG_VERSION.map(|x| x.to_owned()),
+        }
+    }
+}
+
+/// Convert an Info struct into Relay Info json string
+pub fn relay_info_json(info: &config::Info) -> String {
+    // get a default RelayInfo
+    let mut r = RelayInfo::default();
+    // update fields from Info, if present
+    r.name = info.name.clone();
+    r.descr = info.descr.clone();
+    r.pubkey = info.pubkey.clone();
+    r.email = info.email.clone();
+    r.to_json()
+}
+
+impl RelayInfo {
+    pub fn to_json(self) -> String {
+        // create the info ARRAY
+        let mut info_arr: Vec<Value> = vec![];
+        info_arr.push(Value::String("NOSTR_SERVER_INFO".to_owned()));
+        info_arr.push(serde_json::to_value(&self).unwrap());
+        serde_json::to_string_pretty(&info_arr).unwrap()
+    }
+}