feat: add cli addressing from `sha256sum` output

tools/upend_cli/src/main.rs

@@ -45,8 +45,10 @@ enum Commands {
     },
     /// Get the address of a file, attribute or URL.
     Address {
-        /// Path to a file.
-        filepath: PathBuf,
+        /// Type of input to be addressed
+        _type: AddressType,
+        /// Path to a file, hash...
+        input: String,
     },
 }
 
@@ -57,6 +59,14 @@ enum OutputFormat {
     Raw,
 }
 
+#[derive(Copy, Clone, PartialEq, Eq, Debug, ValueEnum)]
+enum AddressType {
+    /// Hash a file and output its address.
+    File,
+    /// Compute an address from the output of `sha256sum`
+    Sha256sum,
+}
+
 fn main() -> anyhow::Result<()> {
     env_logger::init();
     let args = Args::parse();
@@ -117,15 +127,24 @@ fn main() -> anyhow::Result<()> {
                 }
             }
         }
-        Some(Commands::Address { filepath }) => {
-            debug!("Hashing {:?}...", filepath);
-            let fbuffer = FileBuffer::open(&filepath)?;
-            let digest = common::hash(&fbuffer);
-            trace!("Finished hashing {:?}...", &filepath);
-            let address = common::Address::Hash(digest);
+        Some(Commands::Address { _type, input }) => {
+            let address = match _type {
+                AddressType::File => {
+                    let filepath = PathBuf::from(input);
+                    debug!("Hashing {:?}...", filepath);
+                    let fbuffer = FileBuffer::open(&filepath)?;
+                    let digest = common::hash(&fbuffer);
+                    trace!("Finished hashing {:?}...", &filepath);
+                    common::Address::Hash(digest)
+                }
+                AddressType::Sha256sum => {
+                    let digest = multibase::Base::Base16Lower.decode(input)?;
+                    common::Address::Hash(common::Hash(digest))
+                }
+            };
 
             match format {
-                OutputFormat::Json => todo!(),
+                OutputFormat::Json => println!("\"{}\"", address),
                 OutputFormat::Tsv | OutputFormat::Raw => println!("{}", address),
             }
         }