Make the get image from url function more versatile and reusable

It was previously added under the google utils. Now it can be used by
other conversation processors as well.

The updated function
- can get both base64 encoded and PIL formatted images from url
- will return the media type of the image as well in response

src/khoj/processor/conversation/google/utils.py

@@ -1,11 +1,8 @@
 import logging
 import random
-from io import BytesIO
 from threading import Thread
 
 import google.generativeai as genai
-import PIL.Image
-import requests
 from google.generativeai.types.answer_types import FinishReason
 from google.generativeai.types.generation_types import StopCandidateException
 from google.generativeai.types.safety_types import (
@@ -22,7 +19,7 @@ from tenacity import (
     wait_random_exponential,
 )
 
-from khoj.processor.conversation.utils import ThreadedGenerator
+from khoj.processor.conversation.utils import ThreadedGenerator, get_image_from_url
 from khoj.utils.helpers import is_none_or_empty
 
 logger = logging.getLogger(__name__)
@@ -207,7 +204,7 @@ def format_messages_for_gemini(messages: list[ChatMessage], system_prompt: str =
         if isinstance(message.content, list):
             # Convert image_urls to PIL.Image and place them at beginning of list (better for Gemini)
             message.content = [
-                get_image_from_url(item["image_url"]["url"]) if item["type"] == "image_url" else item["text"]
+                get_image_from_url(item["image_url"]["url"])[0] if item["type"] == "image_url" else item["text"]
                 for item in sorted(message.content, key=lambda x: 0 if x["type"] == "image_url" else 1)
             ]
         elif isinstance(message.content, str):
@@ -220,13 +217,3 @@ def format_messages_for_gemini(messages: list[ChatMessage], system_prompt: str =
         messages[0].role = "user"
 
     return messages, system_prompt
-
-
-def get_image_from_url(image_url: str) -> PIL.Image:
-    try:
-        response = requests.get(image_url)
-        response.raise_for_status()  # Check if the request was successful
-        return PIL.Image.open(BytesIO(response.content))
-    except requests.exceptions.RequestException as e:
-        logger.error(f"Failed to get image from URL {image_url}: {e}")
-        return None

src/khoj/processor/conversation/utils.py

@@ -1,10 +1,15 @@
+import base64
 import logging
 import math
+import mimetypes
 import queue
 from datetime import datetime
+from io import BytesIO
 from time import perf_counter
 from typing import Any, Dict, List, Optional
 
+import PIL.Image
+import requests
 import tiktoken
 from langchain.schema import ChatMessage
 from llama_cpp.llama import Llama
@@ -306,3 +311,22 @@ def reciprocal_conversation_to_chatml(message_pair):
 def remove_json_codeblock(response: str):
     """Remove any markdown json codeblock formatting if present. Useful for non schema enforceable models"""
     return response.removeprefix("```json").removesuffix("```")
+
+
+def get_image_from_url(image_url: str, type="pil"):
+    try:
+        response = requests.get(image_url)
+        response.raise_for_status()  # Check if the request was successful
+
+        # Get content type from response or infer from URL
+        content_type = response.headers.get("content-type") or mimetypes.guess_type(image_url)[0] or "image/webp"
+
+        if type == "b64":
+            return base64.b64encode(response.content).decode("utf-8"), content_type
+        elif type == "pil":
+            return PIL.Image.open(BytesIO(response.content)), content_type
+        else:
+            raise ValueError(f"Invalid image type: {type}")
+    except requests.exceptions.RequestException as e:
+        logger.error(f"Failed to get image from URL {image_url}: {e}")
+        return None, None