import json, http.client, ssl, os, logging, base64, time, hashlib
from flask import Response, request, abort
from searx.plugins import Plugin, PluginInfo
from searx.result_types import EngineResults
from flask_babel import gettext
from markupsafe import Markup
logger = logging.getLogger(__name__)
# Constants
TOKEN_EXPIRY_SEC = 60
CONNECTION_TIMEOUT_SEC = 30
class SXNGPlugin(Plugin):
id = "gemini_flash"
def __init__(self, plg_cfg):
super().__init__(plg_cfg)
self.info = PluginInfo(
id=self.id,
name=gettext("Gemini Flash Streaming"),
description=gettext("Live AI search answers using Google Gemini Flash"),
preference_section="general",
)
self.provider = os.getenv('LLM_PROVIDER', 'openrouter').lower()
self.api_key = os.getenv('OPENROUTER_API_KEY') if self.provider == 'openrouter' else os.getenv('GEMINI_API_KEY')
self.model = os.getenv('GEMINI_MODEL', 'gemma-3-27b-it') if self.provider == 'gemini' else os.getenv('OPENROUTER_MODEL', 'google/gemma-3-27b-it:free')
try:
self.max_tokens = int(os.getenv('GEMINI_MAX_TOKENS', 500))
except ValueError:
self.max_tokens = 500
try:
self.temperature = float(os.getenv('GEMINI_TEMPERATURE', 0.2))
except ValueError:
self.temperature = 0.2
self.base_url = os.getenv('OPENROUTER_BASE_URL', 'openrouter.ai')
# Stable secret for multi-worker environments
if self.api_key:
self.secret = os.getenv('SXNG_LLM_SECRET') or hashlib.sha256(self.api_key.encode()).hexdigest()
else:
self.secret = os.getenv('SXNG_LLM_SECRET', '')
logger.warning("Gemini Flash plugin: No API key configured, plugin will be inactive")
def init(self, app):
@app.route('/gemini-stream', methods=['POST'])
def g_stream():
data = request.json or {}
token = data.get('tk', '')
q = data.get('q', '')
try:
ts, sig = token.split('.', 1)
query_clean = q.strip()
expected = hashlib.sha256(f"{ts}{query_clean}{self.secret}".encode()).hexdigest()
if sig != expected or (time.time() - float(ts)) > TOKEN_EXPIRY_SEC:
abort(403)
except (ValueError, KeyError, AttributeError):
abort(403)
context_text = data.get('context', '')
if not self.api_key or not q:
return Response("Error: Missing Key", status=400)
prompt = (
f"SYSTEM: Answer USER QUERY by integrating SEARCH RESULTS with expert knowledge.\n"
f"HIERARCHY: Use RESULTS for facts/data. Use KNOWLEDGE for context/synthesis.\n"
f"CONSTRAINTS: <4 sentences | Dense information | Complete thoughts.\n"
f"FALLBACK: If results are empty, answer from knowledge but note the lack of sources.\n\n"
f"SEARCH RESULTS:\n{context_text}\n\n"
f"USER QUERY: {q}\n\n"
f"ANSWER:"
)
def generate_gemini():
host = "generativelanguage.googleapis.com"
path = f"/v1/models/{self.model}:streamGenerateContent?key={self.api_key}"
try:
conn = http.client.HTTPSConnection(host, timeout=CONNECTION_TIMEOUT_SEC, context=ssl.create_default_context())
payload = {"contents": [{"parts": [{"text": prompt}]}], "generationConfig": {"maxOutputTokens": self.max_tokens, "temperature": self.temperature}}
conn.request("POST", path, body=json.dumps(payload), headers={"Content-Type": "application/json"})
res = conn.getresponse()
if res.status != 200:
logger.error(f"Gemini API Error {res.status}: {res.read().decode('utf-8')}")
return
decoder = json.JSONDecoder()
buffer = ""
while True:
chunk = res.read(128)
if not chunk: break
buffer += chunk.decode('utf-8')
while buffer:
buffer = buffer.lstrip()
if not buffer: break
try:
obj, idx = decoder.raw_decode(buffer)
candidates = obj.get('candidates', [])
if candidates:
content = candidates[0].get('content', {})
parts = content.get('parts', [])
if parts:
text = parts[0].get('text', '')
if text: yield text
buffer = buffer[idx:]
except json.JSONDecodeError: break
conn.close()
except Exception as e: logger.error(f"Gemini Stream Exception: {e}")
def generate_openrouter():
try:
conn = http.client.HTTPSConnection(self.base_url, timeout=CONNECTION_TIMEOUT_SEC, context=ssl.create_default_context())
payload = {
"model": self.model,
"messages": [{"role": "user", "content": prompt}],
"stream": True,
"max_tokens": self.max_tokens,
"temperature": self.temperature
}
headers = {
"Authorization": f"Bearer {self.api_key}",
"Content-Type": "application/json",
"HTTP-Referer": "https://github.com/searxng/searxng",
"X-Title": "SearXNG LLM Plugin"
}
conn.request("POST", "/api/v1/chat/completions", body=json.dumps(payload), headers=headers)
res = conn.getresponse()
if res.status != 200:
logger.error(f"OpenRouter API Error {res.status}: {res.read().decode('utf-8')}")
return
decoder = json.JSONDecoder()
buffer = ""
while True:
chunk = res.read(128)
if not chunk: break
buffer += chunk.decode('utf-8')
while "\n" in buffer:
line, buffer = buffer.split("\n", 1)
if line.startswith("data: "):
data_str = line[6:].strip()
if data_str == "[DONE]": return
try:
obj, _ = decoder.raw_decode(data_str)
content = obj.get("choices", [{}])[0].get("delta", {}).get("content", "")
if content: yield content
except json.JSONDecodeError:
pass
conn.close()
except Exception as e: logger.error(f"OpenRouter Stream Exception: {e}")
generator = generate_openrouter if self.provider == 'openrouter' else generate_gemini
return Response(generator(), mimetype='text/plain', headers={'X-Accel-Buffering': 'no'})
return True
def post_search(self, request, search) -> EngineResults:
results = EngineResults()
try:
if not self.active or not self.api_key or search.search_query.pageno > 1:
return results
raw_results = search.result_container.get_ordered_results()
context_list = [f"[{i+1}] {r.get('title')}: {r.get('content')}" for i, r in enumerate(raw_results[:6])]
context_str = "\n".join(context_list)
# Stateless Handshake
ts = str(int(time.time()))
q_clean = search.search_query.query.strip()
sig = hashlib.sha256(f"{ts}{q_clean}{self.secret}".encode()).hexdigest()
tk = f"{ts}.{sig}"
b64_context = base64.b64encode(context_str.encode('utf-8')).decode('utf-8')
js_q = json.dumps(q_clean)
html_payload = f'''
'''
search.result_container.answers.add(results.types.Answer(answer=Markup(html_payload)))
except Exception as e:
logger.error(f"Gemini Flash plugin error: {e}")
return results