Add Bard client (#5)

- Add Bard client that supports starting a conversation, sending prompts, resetting and closing the conversation
- Add first test
- Add tests pipeline

.github/workflows/test.yml

@@ -0,0 +1,43 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+env:
+    SECURE_1PSID: ${{ secrets.SECURE_1PSID }}
+    SECURE_1PSIDTS: ${{ secrets.SECURE_1PSIDTS }}
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11"]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install poetry
+      run: |
+        curl -sSL https://install.python-poetry.org | python3 -
+
+    - name: Install dependencies
+      run: poetry install
+
+    - name: Run type checker
+      run: poetry run mypy --ignore-missing-imports bard/
+
+    - name: Run tests
+      run: poetry run pytest --cov

README.md

@@ -1,14 +1,20 @@
-# Bard.py
+# <img src="https://raw.githubusercontent.com/vsakkas/bard.py/master/images/logo.svg?token=GHSAT0AAAAAAB7MEK465TODCKRPHN3YQY54ZKGUN4Q" width="24px" /> Bard.py
 
-[![Latest Release](https://img.shields.io/github/v/release/vsakkas/bard.py.svg)](https://github.com/vsakkas/bard.py/releases/tag/v0.1.0)
+[![Latest Release](https://img.shields.io/github/v/release/vsakkas/bard.py.svg)](https://github.com/vsakkas/bard.py/releases/tag/v0.2.0)
 [![Python](https://img.shields.io/badge/python-3.10+-blue.svg)](https://www.python.org/downloads/)
 [![MIT License](https://img.shields.io/badge/license-MIT-blue)](https://github.com/vsakkas/bard.py/blob/master/LICENSE)
 
-Python client for Bard.
+Python Client for Bard, a Chat Based AI tool by Google.
 
 > **Note**
 > This is an **unofficial** client.
 
+## Features
+
+- Connect to Bard, Google's AI-powered personal assistant.
+- Ask questions and have a conversation.
+- Use asyncio for efficient and non-blocking I/O operations.
+
 ## Requirements
 
 - Python 3.10 or newer
@@ -28,6 +34,107 @@ or, if you use [poetry](https://python-poetry.org/):
 poetry add bard-py
 ```
 
+> **Note**
+> Make sure you're using the latest version of Bard.py to ensure best compatibility with Bard.
+
+## Usage
+
+### Prerequisites
+
+To use Bard.py you first need to extract the `__Secure-1PSID` and `__Secure-1PSIDTS` cookies from the Bard web page. These cookies are used to authenticate your requests to the Bard API.
+
+To get the cookies, follow these steps on Chrome:
+- Go to the [Bard web page](https://bard.google.com/).
+- Write a message on the chat dialog that appears.
+- Open the developer tools in your browser (usually by pressing `F12` or right-clicking on the chat dialog and selecting `Inspect`).
+- Select the `Application` tab and click on the `Cookies` option to view all cookies associated with `https://bard.google.com`.
+- Look for the `__Secure-1PSID` and `__Secure-1PSIDTS` cookies and click on them to expand their details.
+- Copy the values of the cookies (they should look like a long string of letters and numbers).
+
+Then, set them as environment variables in your shell:
+
+```bash
+export SECURE_1PSID=<your-cookie>
+export SECURE_1PSIDTS=<your-other-cookie>
+```
+
+or, in your Python code:
+
+```python
+os.environ["SECURE_1PSID"] = "<your-cookie>"
+os.environ["SECURE_1PSIDTS"] = "<your-other-cookie>"
+```
+
+### Example
+
+You can use Bard.py to easily create a CLI client for Bard:
+
+```python
+import asyncio
+
+from bard import BardClient
+
+
+async def main() -> None:
+    async with BardClient() as bard:
+        while True:
+            prompt = input("You: ")
+
+            if prompt == "!reset":
+                await bard.reset_conversation()
+                continue
+            elif prompt == "!exit":
+                break
+
+            response = await bard.ask(prompt)
+            print(f"Bard: {response}")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
+```
+
+### Bard Client
+
+You can create a Bard Client and initialize a connection with Bard which starts a conversation:
+
+```python
+bard = BardClient()
+
+await bard.start_conversation()
+
+# Conversation
+
+await bard.end_conversation()
+```
+
+Alternatively, you can use the `async with` statement to keep the code compact:
+
+```python
+async with BardClient() as bard:
+    # Conversation
+```
+
+### Reset Conversation
+
+You can reset the conversation in order to make the client forget the previous conversation:
+
+```python
+async with BardClient() as bard:
+    # Conversation
+    await bard.reset_conversation()
+```
+
+### Ask
+
+You can ask Bard questions and get the results:
+
+```python
+async with BardClient() as bard:
+    response = await bard.ask("When was Bard released?")
+    print(response)
+```
+
 ## License
 
 This project is licensed under the MIT License - see the [LICENSE](https://github.com/vsakkas/bard.py/blob/master/LICENSE) file for details.

bard/bard.py

@@ -1,3 +1,150 @@
+import json
+import random
+import re
+from os import environ
+
+from aiohttp import ClientSession
+
+from bard.constants import BARD_STREAM_GENERATE_URL, BARD_URL, HEADERS
+from bard.exceptions import AskException, CreateConversationException
+from bard.utils import double_json_stringify
+
+
 class BardClient:
-    def __init__(self) -> None:
-        pass
+    def __init__(
+        self, secure_1psid: str | None = None, secure_1psidts: str | None = None
+    ) -> None:
+        """
+        Client for Bard.
+        """
+        self.secure_1psid = secure_1psid if secure_1psid else environ["SECURE_1PSID"]
+        self.secure_1psidts = (
+            secure_1psidts if secure_1psidts else environ["SECURE_1PSIDTS"]
+        )
+        self.conversation_id: str | None = None
+        self.response_id: str | None = None
+        self.choice_id: str | None = None
+        self.session: ClientSession | None = None
+
+    async def __aenter__(self) -> "BardClient":
+        await self.start_conversation()
+        return self
+
+    async def __aexit__(self, exc_type, exc_value, traceback) -> None:
+        await self.close_conversation()
+
+    async def _get_session(self, force_close: bool = False) -> ClientSession:
+        # Use cookies to create a conversation.
+        cookies = {
+            "__Secure-1PSID": self.secure_1psid,
+            "__Secure-1PSIDTS": self.secure_1psidts,
+        }
+
+        if self.session and force_close:
+            await self.session.close()
+
+        if not self.session:
+            self.session = ClientSession(
+                headers=HEADERS,
+                cookies=cookies,
+            )
+
+        return self.session
+
+    def _build_ask_parameters(self) -> dict:
+        return {
+            "bl": "boq_assistant-bard-web-server_20231031.09_p7",
+            "_reqid": "".join(str(random.randint(0, 9)) for _ in range(7)),
+            "rt": "c",
+        }
+
+    def _build_ask_arguments(self, prompt: str) -> dict:
+        request_data = [
+            [prompt],
+            None,
+            [self.conversation_id, self.response_id, self.choice_id],
+        ]
+
+        return {
+            "f.req": double_json_stringify(request_data),
+            "at": self.snlm0e,
+        }
+
+    async def start_conversation(self) -> None:
+        """
+        Connect to Bard and create a new conversation.
+        """
+        session = await self._get_session(force_close=True)
+
+        async with session.get(BARD_URL) as response:
+            if response.status != 200:
+                raise CreateConversationException(
+                    f"Failed to create conversation, received status: {response.status}"
+                )
+
+            response_text = await response.text()
+
+            snlm0e_dict = re.search(r"\"SNlM0e\":\"(?P<value>.*?)\"", response_text)
+
+            if not snlm0e_dict:
+                raise CreateConversationException(
+                    "Failed to create conversation, SNlM0e value was not found."
+                )
+
+            self.snlm0e = snlm0e_dict.group("value")
+
+    async def ask(self, prompt: str) -> str:
+        """
+        Send a prompt to Bard and return the answer.
+
+        Parameters
+        ----------
+        prompt: str
+            The prompt that needs to be sent to Bard.
+
+        Returns
+        -------
+        str
+            The response from Bard.
+        """
+        parameters = self._build_ask_parameters()
+        arguments = self._build_ask_arguments(prompt)
+
+        session = await self._get_session()
+
+        async with session.post(
+            BARD_STREAM_GENERATE_URL, params=parameters, data=arguments
+        ) as response:
+            if response.status != 200:
+                raise AskException(
+                    f"Failed to get response, received status: {response.status}"
+                )
+
+            response_text = await response.text()
+            response_data = json.loads(response_text.splitlines()[3])
+
+            message = json.loads(response_data[0][2])
+
+            self.conversation_id = message[1][0]
+            self.response_id = message[1][1]
+            self.choice_id = message[4][0][0]
+
+            return message[4][0][1][0]
+
+    async def reset_conversation(self) -> None:
+        """
+        Clear current conversation information and connection and start new ones.
+        """
+        await self.close_conversation()
+        await self.start_conversation()
+
+    async def close_conversation(self) -> None:
+        """
+        Close all connections to Bard. Clear conversation information.
+        """
+        if self.session and not self.session.closed:
+            await self.session.close()
+
+        self.conversation_id = None
+        self.response_id = None
+        self.choice_id = None

bard/constants.py

@@ -0,0 +1,21 @@
+USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36"
+
+HEADERS = {
+    "Accept": "*/*",
+    "Accept-Encoding": "gzip, deflate, br",
+    "Accept-Language": "en-US,en;q=0.9",
+    "Content-Type": "application/x-www-form-urlencoded;charset=UTF-8",
+    "Origin": "https://bard.google.com",
+    "Referer": "https://bard.google.com/",
+    "Sec-Ch-Ua": '"Google Chrome";v="119", "Chromium";v="119", "Not?A_Brand";v="24"',
+    "Sec-Ch-Ua-Mobile": "?0",
+    "Sec-Ch-Ua-Platform": "Windows",
+    "Sec-Fetch-Dest": "empty",
+    "Sec-Fetch-Mode": "cors",
+    "Sec-Fetch-Site": "same-origin",
+    "User-Agent": USER_AGENT,
+    "X-Same-Domain": "1",
+}
+
+BARD_URL = "https://bard.google.com/chat"
+BARD_STREAM_GENERATE_URL = "https://bard.google.com/_/BardChatUi/data/assistant.lamda.BardFrontendService/StreamGenerate"

bard/exceptions.py

@@ -0,0 +1,6 @@
+class CreateConversationException(Exception):
+    pass
+
+
+class AskException(Exception):
+    pass

bard/utils.py

@@ -0,0 +1,5 @@
+import json
+
+
+def double_json_stringify(data) -> str:
+    return json.dumps([None, json.dumps(data)])

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "bard-py"
-version = "0.1.0"
+version = "0.2.0"
 description = "Python Client for Bard."
 authors = ["vsakkas <vasileios.sakkas96@gmail.com>"]
 license = "MIT"

tests/test_ask.py

@@ -0,0 +1,9 @@
+import pytest
+
+from bard import BardClient
+
+
+@pytest.mark.asyncio
+async def test_ask() -> None:
+    async with BardClient() as bard:
+        _ = await bard.ask("Tell me a joke")