Add support for shiny express apps

CHANGELOG.md

@@ -9,9 +9,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Added the name of the environment variables to the help output for those options that
   use environment variables as a default value.
+- Added support for deploying Shiny Express applications.
 
 ### Changed
-- Improved the error and warning outputs when options conflict by providing the source 
+- Improved the error and warning outputs when options conflict by providing the source
   from which the values have been determined. This allows for faster resolution of issues
   when combinations of stored credentials, environment variables and command line options
   are used.

rsconnect/main.py

@@ -80,6 +80,7 @@
     produce_bootstrap_output,
     parse_client_response,
 )
+from .shiny_express import escape_to_var_name, is_express_app
 
 server_store = ServerStore()
 future_enabled = False
@@ -123,7 +124,7 @@ def output_params(
                 if k in {"api_key", "api-key"}:
                     val = "**********"
                 sourceName = validation.get_parameter_source_name_from_ctx(k, ctx)
-                logger.log(VERBOSE, "    %-18s%s (from %s)", (k+":"), val, sourceName)
+                logger.log(VERBOSE, "    %-18s%s (from %s)", (k + ":"), val, sourceName)
 
 
 def server_args(func):
@@ -1013,7 +1014,7 @@ def deploy_voila(
     server: str = None,
     api_key: str = None,
     insecure: bool = False,
-    cacert: typing.IO = None,
+    cacert: str = None,
     connect_server: api.RSConnectServer = None,
     multi_notebook: bool = False,
     no_verify: bool = False,
@@ -1288,7 +1289,7 @@ def deploy_html(
     server: str = None,
     api_key: str = None,
     insecure: bool = False,
-    cacert: typing.IO = None,
+    cacert: str = None,
     account: str = None,
     token: str = None,
     secret: str = None,
@@ -1324,7 +1325,6 @@ def deploy_html(
 
 
 def generate_deploy_python(app_mode: AppMode, alias: str, min_version: str, desc: Optional[str] = None):
-
     if desc is None:
         desc = app_mode.desc()
 
@@ -1415,17 +1415,40 @@ def deploy_app(
         no_verify: bool = False,
     ):
         set_verbosity(verbose)
-        output_params(ctx, locals().items())
-        kwargs = locals()
-        kwargs["entrypoint"] = entrypoint = validate_entry_point(entrypoint, directory)
-        kwargs["extra_files"] = extra_files = validate_extra_files(directory, extra_files)
+        entrypoint = validate_entry_point(entrypoint, directory)
+        extra_files = validate_extra_files(directory, extra_files)
         environment = create_python_environment(
             directory,
             force_generate,
             python,
         )
 
-        ce = RSConnectExecutor(**kwargs)
+        if is_express_app(entrypoint + ".py", directory):
+            entrypoint = "shiny.express.app:" + escape_to_var_name(entrypoint + ".py")
+
+        extra_args = dict(
+            directory=directory,
+            server=server,
+            exclude=exclude,
+            new=new,
+            app_id=app_id,
+            title=title,
+            visibility=visibility,
+            disable_env_management=disable_env_management,
+            env_vars=env_vars,
+        )
+
+        ce = RSConnectExecutor(
+            name=name,
+            api_key=api_key,
+            insecure=insecure,
+            cacert=cacert,
+            account=account,
+            token=token,
+            secret=secret,
+            **extra_args,
+        )
+
         (
             ce.validate_server()
             .validate_app_mode(app_mode=app_mode)

rsconnect/shiny_express.py

@@ -0,0 +1,99 @@
+# The contents of this file are copied from:
+# https://github.com/posit-dev/py-shiny/blob/feb4cb7f872922717c39753514ae2d7fa32f10a1/shiny/express/_is_express.py
+
+from __future__ import annotations
+
+import ast
+from pathlib import Path
+import re
+
+__all__ = ("is_express_app",)
+
+
+def is_express_app(app: str, app_dir: str | None) -> bool:
+    """Detect whether an app file is a Shiny express app
+
+    Parameters
+    ----------
+    app
+        App filename, like "app.py". It may be a relative path or absolute path.
+    app_dir
+        Directory containing the app file. If this is `None`, then `app` must be an
+        absolute path.
+
+    Returns
+    -------
+    :
+        `True` if it is a Shiny express app, `False` otherwise.
+    """
+    if not app.lower().endswith(".py"):
+        return False
+
+    if app_dir is not None:
+        app_path = Path(app_dir) / app
+    else:
+        app_path = Path(app)
+
+    if not app_path.exists():
+        return False
+
+    try:
+        # Read the file, parse it, and look for any imports of shiny.express.
+        with open(app_path) as f:
+            content = f.read()
+        tree = ast.parse(content, app_path)
+        detector = DetectShinyExpressVisitor()
+        detector.visit(tree)
+
+    except Exception:
+        return False
+
+    return detector.found_shiny_express_import
+
+
+class DetectShinyExpressVisitor(ast.NodeVisitor):
+    def __init__(self):
+        super().__init__()
+        self.found_shiny_express_import = False
+
+    def visit_Import(self, node: ast.Import):
+        if any(alias.name == "shiny.express" for alias in node.names):
+            self.found_shiny_express_import = True
+
+    def visit_ImportFrom(self, node: ast.ImportFrom):
+        if node.module == "shiny.express":
+            self.found_shiny_express_import = True
+        elif node.module == "shiny" and any(alias.name == "express" for alias in node.names):
+            self.found_shiny_express_import = True
+
+    # Visit top-level nodes.
+    def visit_Module(self, node: ast.Module):
+        super().generic_visit(node)
+
+    # Don't recurse into any nodes, so the we'll only ever look at top-level nodes.
+    def generic_visit(self, node: ast.AST):
+        pass
+
+
+def escape_to_var_name(x: str) -> str:
+    """
+    Given a string, escape it to a valid Python variable name which contains
+    [a-zA-Z0-9_]. All other characters will be escaped to _<hex>_. Also, if the first
+    character is a digit, it will be escaped to _<hex>_, because Python variable names
+    can't begin with a digit.
+    """
+    encoded = ""
+    is_first = True
+
+    for char in x:
+        if is_first and re.match("[0-9]", char):
+            encoded += f"_{ord(char):x}_"
+        elif re.match("[a-zA-Z0-9]", char):
+            encoded += char
+        else:
+            encoded += f"_{ord(char):x}_"
+
+        if is_first:
+            is_first = False
+
+    return encoded