Add fingerprint and key-id commands

.github/workflows/ci.yaml

@@ -87,7 +87,7 @@ jobs:
           toolchain: 1.81.0
           override: true
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         env:
           cache-name: cache-dependencies
         with:

bpb/src/config.rs

@@ -62,25 +62,22 @@ struct PublicKey {
 }
 
 fn keys_file() -> std::path::PathBuf {
-  // for archaic reasons we first check the config path
-  // however this is an error, we shouldn’t store this as config seeing as it is
-  // tied to the private key which is likely a host setting and should not thus be
-  // synced between machines
+    // for archaic reasons we first check the config path
+    // however this is an error, we shouldn’t store this as config seeing as it is
+    // tied to the private key which is likely a host setting and should not thus be
+    // synced between machines
 
-  let config_path = if let Ok(config_home) = std::env::var("XDG_CONFIG_HOME") {
-      std::path::PathBuf::from(config_home).join("pkgx/bpb.toml")
-  } else {
-      std::path::PathBuf::from(std::env::var("HOME").unwrap()).join(".config/pkgx/bpb.toml")
-  };
+    let config_path = if let Ok(config_home) = std::env::var("XDG_CONFIG_HOME") {
+        std::path::PathBuf::from(config_home).join("pkgx/bpb.toml")
+    } else {
+        std::path::PathBuf::from(std::env::var("HOME").unwrap()).join(".config/pkgx/bpb.toml")
+    };
 
-  if config_path.exists() {
-      config_path
-  } else {
-      let data_path = if let Ok(data_home) = std::env::var("XDG_DATA_HOME") {
-          std::path::PathBuf::from(data_home).join("pkgx/bpb.toml")
-      } else {
-          std::path::PathBuf::from(std::env::var("HOME").unwrap()).join(".local/share/pkgx/bpb.toml")
-      };
-      data_path
-  }
+    if config_path.exists() {
+        config_path
+    } else if let Ok(data_home) = std::env::var("XDG_DATA_HOME") {
+        std::path::PathBuf::from(data_home).join("pkgx/bpb.toml")
+    } else {
+        std::path::PathBuf::from(std::env::var("HOME").unwrap()).join(".local/share/pkgx/bpb.toml")
+    }
 }

bpb/src/keychain.rs

@@ -81,8 +81,7 @@ pub fn add_keychain_item(service: &str, account: &str, secret: &str) -> Result<(
             Ok(())
         } else {
             Err(failure::err_msg(format!(
-                "SecItemAdd failed with status: {}",
-                status
+                "SecItemAdd failed with status: {status}"
             )))
         }
     }
@@ -155,8 +154,7 @@ pub fn get_keychain_item(service: &str, account: &str) -> Result<String, Error>
             Ok(secret)
         } else {
             Err(failure::err_msg(format!(
-                "SecItemCopyMatching failed with status: {}",
-                status
+                "SecItemCopyMatching failed with status: {status}"
             )))
         }
     }

bpb/src/main.rs

@@ -33,6 +33,8 @@ fn main() -> Result<(), Error> {
         Some("import") => import(),
         Some("upgrade") => upgrade(),
         Some("print") => print_public_key(),
+        Some("fingerprint") => print_fingerprint(),
+        Some("key-id") => print_key_id(),
         Some("--help") => print_help_message(),
         Some(arg) if gpg_sign_arg(arg) => verify_commit(),
         _ => {
@@ -54,7 +56,10 @@ fn print_help_message() -> Result<(), Error> {
     println!("A program for signing git commits.\n");
     println!("Arguments:");
     println!("    init <userid>:    Generate a keypair and store in the keychain.");
-    println!("    print:            Print public key in OpenPGP format.\n");
+    println!("    import <key>:     Import a key from the command line.");
+    println!("    print:            Print public key in OpenPGP format.");
+    println!("    fingerprint:      Print the fingerprint of the public key.");
+    println!("    key-id:           Print the key ID of the public key.\n");
     println!("See https://github.com/pkgxdev/bpb for more information.");
     Ok(())
 }
@@ -104,6 +109,29 @@ fn print_public_key() -> Result<(), Error> {
     Ok(())
 }
 
+fn get_fingerprint() -> Result<pbp::Fingerprint, Error> {
+    let config = Config::load()?;
+    let service = config.service();
+    let account = config.user_id();
+    let secret_str = get_keychain_item(service, account)?;
+    let secret = to_32_bytes(&secret_str)?;
+
+    let keypair = KeyData::load(&config, secret)?;
+    Ok(keypair.fingerprint())
+}
+
+// Prints the fingerprint (sha256 hash of the public key -- 20 bytes)
+fn print_fingerprint() -> Result<(), Error> {
+    println!("{}", pretty_print_hex_string(&get_fingerprint()?));
+    Ok(())
+}
+
+// Prints the long key ID (the last 8 bytes of the fingerprint)
+fn print_key_id() -> Result<(), Error> {
+    println!("{}", pretty_print_hex_string(&get_fingerprint()?[12..]));
+    Ok(())
+}
+
 fn verify_commit() -> Result<(), Error> {
     use std::io::Read;
 
@@ -123,7 +151,7 @@ fn verify_commit() -> Result<(), Error> {
     let sig = keypair.sign(commit.as_bytes())?;
 
     eprintln!("\n[GNUPG:] SIG_CREATED ");
-    println!("{}", sig);
+    println!("{sig}");
     Ok(())
 }
 
@@ -167,3 +195,11 @@ fn to_32_bytes(slice: &String) -> Result<[u8; 32], Error> {
     array[..len].copy_from_slice(&vector[..len]);
     Ok(array)
 }
+
+// iterates over a hex array and prints space-separated groups of four characters
+fn pretty_print_hex_string(hex: &[u8]) -> String {
+    hex.chunks(2)
+        .map(hex::encode_upper)
+        .collect::<Vec<String>>()
+        .join(" ")
+}