Add ability to check apk signature via command line.

src/launchpad/cli.py

@@ -7,6 +7,7 @@
 import click
 
 from . import __version__
+from .distribution.cli import distribution_command
 from .service import run_service
 from .size.cli import size_command
 from .utils.console import console
@@ -81,6 +82,7 @@ def serve(host: str, port: int, mode: str | None, verbose: bool) -> None:
 
 
 cli.add_command(size_command)
+cli.add_command(distribution_command)
 
 
 def main() -> None:

src/launchpad/distribution/cli.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import click
+
+from ..utils.android.apksigner import Apksigner, ApksignerError
+from ..utils.console import console
+from ..utils.logging import setup_logging
+
+
+@click.command("distribution")
+@click.argument("apk_path", type=click.Path(exists=True, path_type=Path))
+@click.option("--verbose", "-v", is_flag=True, help="Enable verbose logging output.")
+def distribution_command(apk_path: Path, verbose: bool) -> None:
+    """Print certificate information for an APK file.
+
+    Uses apksigner to extract and display the certificate information
+    from the specified APK file.
+    """
+    setup_logging(verbose=verbose, quiet=False)
+
+    if not apk_path.suffix.lower() == ".apk":
+        console.print(f"[bold red]Error:[/bold red] File must be an APK file, got: {apk_path.suffix}")
+        raise click.Abort()
+
+    console.print(f"[bold blue]Analyzing APK certificate:[/bold blue] {apk_path}")
+
+    try:
+        apksigner = Apksigner()
+        cert_info = apksigner.get_certs(apk_path)
+        console.print("\n[bold green]Certificate Information:[/bold green]")
+        console.print(cert_info)
+    except ApksignerError as e:
+        console.print(f"[bold red]Error running apksigner:[/bold red] {e}")
+        if verbose:
+            console.print(f"Return code: {e.returncode}")
+            console.print(f"Stdout: {e.stdout}")
+            console.print(f"Stderr: {e.stderr}")
+        raise click.Abort()
+    except Exception as e:
+        console.print(f"[bold red]Unexpected error:[/bold red] {e}")
+        if verbose:
+            console.print_exception()
+        raise click.Abort()