Create _config.py

_config.py

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+import os
+import logging
+from typing import Optional
+
+# Third-party imports
+try:
+    from google import genai
+except ImportError:
+    # We allow this to fail here, the app.py main will catch it.
+    genai = None
+
+try:
+    from transformers import pipeline
+except ImportError:
+    pipeline = None
+
+logger = logging.getLogger("fact_checker_config")
+
+# --- CONFIGURATION FROM ENVIRONMENT ---
+GEMINI_API_KEY = os.getenv("GEMINI_API_KEY")
+SERPAPI_KEY = os.getenv("SERPAPI_KEY")
+SAFE_BROWSING_KEY = os.getenv("SAFE_BROWSING_KEY")
+VIRUSTOTAL_KEY = os.getenv("VIRUSTOTAL_KEY")
+GENAI_MODEL = os.getenv("GENAI_MODEL", "gemini-2.5-flash")
+HF_ZERO_SHOT_MODEL = os.getenv("HF_ZERO_SHOT", "facebook/bart-large-mnli")
+
+# Constants
+CANDIDATE_LABELS = ["True", "False", "Misleading", "Unclear", "Opinionated", "Unsupported"]
+MAX_BYTES = 6 * 1024 * 1024  # 6MB for image download
+ALLOWED_CONTENT_PREFIXES = ("image/",)
+SOURCE_TRUST = {
+    "reuters.com": 0.95, "apnews.com": 0.95, "bbc.com": 0.93, "theguardian.com": 0.9,
+    "nytimes.com": 0.9, "washingtonpost.com": 0.9,
+}
+
+# --- CLIENT INITIALIZATION ---
+GEMINI_CLIENT: Optional[genai.Client] = None
+ZERO_SHOT_CLASSIFIER: Optional[pipeline] = None
+
+if GEMINI_API_KEY and genai:
+    try:
+        GEMINI_CLIENT = genai.Client(api_key=GEMINI_API_KEY)
+        logger.info("Gemini client initialized.")
+    except Exception as e:
+        logger.error(f"Failed to initialize Gemini client: {e}")
+
+if pipeline:
+    try:
+        ZERO_SHOT_CLASSIFIER = pipeline("zero-shot-classification", model=HF_ZERO_SHOT_MODEL)
+        logger.info(f"Hugging Face zero-shot pipeline loaded: {HF_ZERO_SHOT_MODEL}")
+    except Exception as e:
+        logger.warning(f"Hugging Face pipeline initialization failed: {e}")