console: add a data view overlay for command output

Fixes #2654

mitmproxy/command.py

@@ -170,7 +170,7 @@ class Command:
             if chk:
                 pargs.extend(remainder)
             else:
-                raise exceptions.CommandError("Invalid value type.")
+                raise exceptions.CommandError("Invalid value type: %s - expected %s" % (remainder, self.paramtypes[-1]))
 
         with self.manager.master.handlecontext():
             ret = self.func(*pargs)

mitmproxy/test/tutils.py

@@ -1,4 +1,3 @@
-import time
 from io import BytesIO
 
 from mitmproxy.utils import data

mitmproxy/tools/console/commandexecutor.py

@@ -2,6 +2,8 @@ import typing
 
 from mitmproxy import exceptions
 from mitmproxy import flow
+
+from mitmproxy.tools.console import overlay
 from mitmproxy.tools.console import signals
 
 
@@ -21,9 +23,11 @@ class CommandExecutor:
                         signals.status_message.send(
                             message="Command returned %s flows" % len(ret)
                         )
-                    elif len(str(ret)) < 50:
-                        signals.status_message.send(message=str(ret))
                     else:
-                        signals.status_message.send(
+                        self.master.overlay(
-                            message="Command returned too much data to display."
+                            overlay.DataViewerOverlay(
-                        )
+                                self.master,
+                                ret,
+                            ),
+                            valign="top"
+                        )

mitmproxy/tools/console/grideditor/col.py

@@ -0,0 +1,67 @@
+import typing
+
+import urwid
+
+from mitmproxy.tools.console import signals
+from mitmproxy.tools.console.grideditor import base
+from mitmproxy.utils import strutils
+
+strbytes = typing.Union[str, bytes]
+
+
+class Column(base.Column):
+    def Display(self, data):
+        return Display(data)
+
+    def Edit(self, data):
+        return Edit(data)
+
+    def blank(self):
+        return ""
+
+    def keypress(self, key, editor):
+        if key in ["m_select"]:
+            editor.walker.start_edit()
+        else:
+            return key
+
+
+class Display(base.Cell):
+    def __init__(self, data: strbytes) -> None:
+        self.data = data
+        if isinstance(data, bytes):
+            escaped = strutils.bytes_to_escaped_str(data)
+        else:
+            escaped = data.encode()
+        w = urwid.Text(escaped, wrap="any")
+        super().__init__(w)
+
+    def get_data(self) -> strbytes:
+        return self.data
+
+
+class Edit(base.Cell):
+    def __init__(self, data: strbytes) -> None:
+        if isinstance(data, bytes):
+            escaped = strutils.bytes_to_escaped_str(data)
+        else:
+            escaped = data.encode()
+        self.type = type(data)  # type: typing.Type
+        w = urwid.Edit(edit_text=escaped, wrap="any", multiline=True)
+        w = urwid.AttrWrap(w, "editfield")
+        super().__init__(w)
+
+    def get_data(self) -> strbytes:
+        txt = self._w.get_text()[0].strip()
+        try:
+            if self.type == bytes:
+                return strutils.escaped_str_to_bytes(txt)
+            else:
+                return txt.decode()
+        except ValueError:
+            signals.status_message.send(
+                self,
+                message="Invalid Python-style string encoding.",
+                expire=1000
+            )
+            raise

mitmproxy/tools/console/grideditor/col_bytes.py

@@ -46,7 +46,7 @@ class Edit(base.Cell):
         except ValueError:
             signals.status_message.send(
                 self,
-                message="Invalid Python-style string encoding.",
+                message="Invalid data.",
                 expire=1000
             )
             raise

mitmproxy/tools/console/grideditor/editors.py

@@ -2,6 +2,7 @@
 from mitmproxy import exceptions
 from mitmproxy.tools.console import layoutwidget
 from mitmproxy.tools.console.grideditor import base
+from mitmproxy.tools.console.grideditor import col
 from mitmproxy.tools.console.grideditor import col_text
 from mitmproxy.tools.console.grideditor import col_bytes
 from mitmproxy.tools.console.grideditor import col_subgrid
@@ -169,3 +170,20 @@ class OptionsEditor(base.GridEditor, layoutwidget.LayoutWidget):
 
     def is_error(self, col, val):
         pass
+
+
+class DataViewer(base.GridEditor, layoutwidget.LayoutWidget):
+    title = None  # type: str
+
+    def __init__(self, master, vals):
+        if vals:
+            if not isinstance(vals[0], list):
+                vals = [[i] for i in vals]
+            self.columns = [col.Column("")] * len(vals[0])
+        super().__init__(master, vals, self.callback)
+
+    def callback(self, vals):
+        pass
+
+    def is_error(self, col, val):
+        pass

mitmproxy/tools/console/overlay.py

@@ -148,3 +148,30 @@ class OptionsOverlay(urwid.WidgetWrap, layoutwidget.LayoutWidget):
 
     def layout_popping(self):
         return self.ge.layout_popping()
+
+
+class DataViewerOverlay(urwid.WidgetWrap, layoutwidget.LayoutWidget):
+    keyctx = "grideditor"
+
+    def __init__(self, master, vals):
+        """
+            vspace: how much vertical space to keep clear
+        """
+        cols, rows = master.ui.get_cols_rows()
+        self.ge = grideditor.DataViewer(master, vals)
+        super().__init__(
+            urwid.AttrWrap(
+                urwid.LineBox(
+                    urwid.BoxAdapter(self.ge, rows - 5),
+                    title="Data viewer"
+                ),
+                "background"
+            )
+        )
+        self.width = math.ceil(cols * 0.8)
+
+    def key_responder(self):
+        return self.ge.key_responder()
+
+    def layout_popping(self):
+        return self.ge.layout_popping()