Added 02.echo-bot (#369)

* Added 02.echo-bot

* Removed LUIS keys from settings.

* Added new on_error messages, standardized app.py

* Corrected 02.echo-bot README

* Removed adapter_with_error_handler.py (migrated to app.py)

Author: tracyboehrer

samples/02.echo-bot/README.md

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+# EchoBot
+
+Bot Framework v4 echo bot sample.
+
+This bot has been created using [Bot Framework](https://dev.botframework.com), it shows how to create a simple bot that accepts input from the user and echoes it back.
+
+## Running the sample
+- Clone the repository
+```bash
+git clone https://github.com/Microsoft/botbuilder-python.git
+```
+- Activate your desired virtual environment
+- Bring up a terminal, navigate to `botbuilder-python\samples\02.echo-bot` folder
+- In the terminal, type `pip install -r requirements.txt`
+- In the terminal, type `python app.py`
+
+## Testing the bot using Bot Framework Emulator
+[Microsoft Bot Framework Emulator](https://github.com/microsoft/botframework-emulator) is a desktop application that allows bot developers to test and debug their bots on localhost or running remotely through a tunnel.
+
+- Install the Bot Framework emulator from [here](https://github.com/Microsoft/BotFramework-Emulator/releases)
+
+### Connect to bot using Bot Framework Emulator
+- Launch Bot Framework Emulator
+- Paste this URL in the emulator window - http://localhost:3978/api/messages
+
+## Further reading
+
+- [Bot Framework Documentation](https://docs.botframework.com)
+- [Bot Basics](https://docs.microsoft.com/azure/bot-service/bot-builder-basics?view=azure-bot-service-4.0)
+- [Activity processing](https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-concept-activity-processing?view=azure-bot-service-4.0)

samples/02.echo-bot/app.py

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+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+import asyncio
+import sys
+from datetime import datetime
+from types import MethodType
+
+from flask import Flask, request, Response
+from botbuilder.core import BotFrameworkAdapterSettings, TurnContext, BotFrameworkAdapter
+from botbuilder.schema import Activity, ActivityTypes
+
+from bots import EchoBot
+
+# Create the loop and Flask app
+LOOP = asyncio.get_event_loop()
+APP = Flask(__name__, instance_relative_config=True)
+APP.config.from_object("config.DefaultConfig")
+
+# Create adapter.
+# See https://aka.ms/about-bot-adapter to learn more about how bots work.
+SETTINGS = BotFrameworkAdapterSettings(APP.config["APP_ID"], APP.config["APP_PASSWORD"])
+ADAPTER = BotFrameworkAdapter(SETTINGS)
+
+
+# Catch-all for errors.
+async def on_error(self, context: TurnContext, error: Exception):
+    # This check writes out errors to console log .vs. app insights.
+    # NOTE: In production environment, you should consider logging this to Azure
+    #       application insights.
+    print(f"\n [on_turn_error] unhandled error: {error}", file=sys.stderr)
+
+    # Send a message to the user
+    await context.send_activity("The bot encountered an error or bug.")
+    await context.send_activity("To continue to run this bot, please fix the bot source code.")
+    # Send a trace activity if we're talking to the Bot Framework Emulator
+    if context.activity.channel_id == 'emulator':
+        # Create a trace activity that contains the error object
+        trace_activity = Activity(
+            label="TurnError",
+            name="on_turn_error Trace",
+            timestamp=datetime.utcnow(),
+            type=ActivityTypes.trace,
+            value=f"{error}",
+            value_type="https://www.botframework.com/schemas/error"
+        )
+        # Send a trace activity, which will be displayed in Bot Framework Emulator
+        await context.send_activity(trace_activity)
+
+ADAPTER.on_turn_error = MethodType(on_error, ADAPTER)
+
+# Create the Bot
+BOT = EchoBot()
+
+# Listen for incoming requests on /api/messages.s
+@APP.route("/api/messages", methods=["POST"])
+def messages():
+    # Main bot message handler.
+    if "application/json" in request.headers["Content-Type"]:
+        body = request.json
+    else:
+        return Response(status=415)
+
+    activity = Activity().deserialize(body)
+    auth_header = (
+        request.headers["Authorization"] if "Authorization" in request.headers else ""
+    )
+
+    try:
+        task = LOOP.create_task(
+            ADAPTER.process_activity(activity, auth_header, BOT.on_turn)
+        )
+        LOOP.run_until_complete(task)
+        return Response(status=201)
+    except Exception as exception:
+        raise exception
+
+
+if __name__ == "__main__":
+    try:
+        APP.run(debug=False, port=APP.config["PORT"])  # nosec debug
+    except Exception as exception:
+        raise exception

samples/02.echo-bot/bots/__init__.py

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+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+from .echo_bot import EchoBot
+
+__all__ = ["EchoBot"]

samples/02.echo-bot/bots/echo_bot.py

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+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+from botbuilder.core import ActivityHandler, MessageFactory, TurnContext
+from botbuilder.schema import ChannelAccount
+
+
+class EchoBot(ActivityHandler):
+    async def on_members_added_activity(
+        self, members_added: [ChannelAccount], turn_context: TurnContext
+    ):
+        for member in members_added:
+            if member.id != turn_context.activity.recipient.id:
+                await turn_context.send_activity("Hello and welcome!")
+
+    async def on_message_activity(self, turn_context: TurnContext):
+        return await turn_context.send_activity(MessageFactory.text(f"Echo: {turn_context.activity.text}"))

samples/02.echo-bot/config.py

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+#!/usr/bin/env python3
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+import os
+
+""" Bot Configuration """
+
+
+class DefaultConfig:
+    """ Bot Configuration """
+
+    PORT = 3978
+    APP_ID = os.environ.get("MicrosoftAppId", "")
+    APP_PASSWORD = os.environ.get("MicrosoftAppPassword", "")

samples/02.echo-bot/requirements.txt

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+botbuilder-core>=4.4.0b1
+flask>=1.0.3