Add comprehensive test suite for image processing and related services

- Implement tests for database generator to ensure proper session handling.
- Create tests for EXIF extraction and conversion functions.
- Add tests for image-related endpoints, ensuring proper data retrieval and isolation between clients.
- Develop tests for OCR functionality, including language detection and text extraction.
- Introduce tests for the image processing pipeline, covering success and failure scenarios.
- Validate rate limiting functionality and ensure independent counters for different clients.
- Implement scraper tests to verify HTML content fetching and error handling.
- Add unit tests for various services, including storage and filename generation.
- Establish worker entry point for ARQ to handle background image processing tasks.

app/config.py

@@ -0,0 +1,121 @@
+"""
+Configuration centralisée — chargée depuis .env
+"""
+from pathlib import Path
+from typing import List
+from pydantic_settings import BaseSettings
+from pydantic import field_validator
+import json
+
+
+class Settings(BaseSettings):
+    # Application
+    APP_NAME: str = "Imago"
+    APP_VERSION: str = "1.0.0"
+    DEBUG: bool = False
+    SECRET_KEY: str = "changez-moi"
+
+    # Serveur
+    HOST: str = "0.0.0.0"
+    PORT: int = 8000
+
+    # Base de données
+    DATABASE_URL: str = "sqlite+aiosqlite:///./data/imago.db"
+
+    # Stockage
+    UPLOAD_DIR: str = "./data/uploads"
+    THUMBNAILS_DIR: str = "./data/thumbnails"
+    MAX_UPLOAD_SIZE_MB: int = 50
+
+    # AI — Configuration
+    AI_ENABLED: bool = True
+    AI_PROVIDER: str = "openrouter"
+
+    # AI — Google Gemini
+    GEMINI_API_KEY: str = ""
+    GEMINI_MODEL: str = "gemini-3.1-pro-preview"
+    GEMINI_MAX_TOKENS: int = 1024
+
+    # AI — OpenRouter
+    OPENROUTER_API_KEY: str = ""
+    OPENROUTER_MODEL: str = "qwen/qwen2.5-vl-72b-instruct"
+
+    # AI — Comportement
+    AI_TAGS_MIN: int = 5
+    AI_TAGS_MAX: int = 10
+    AI_DESCRIPTION_LANGUAGE: str = "français"
+    AI_CACHE_DAYS: int = 30
+
+    # OCR
+    OCR_ENABLED: bool = True
+    TESSERACT_CMD: str = "/usr/bin/tesseract"
+    OCR_LANGUAGES: str = "fra+eng"
+
+    # CORS
+    CORS_ORIGINS: List[str] = ["http://localhost:3000", "http://localhost:5173"]
+
+    # Authentification
+    ADMIN_API_KEY: str = ""
+    JWT_SECRET_KEY: str = "changez-moi-jwt-secret"
+    JWT_ALGORITHM: str = "HS256"
+
+    # Rate limiting — global (legacy)
+    RATE_LIMIT_UPLOAD: int = 10
+    RATE_LIMIT_AI: int = 20
+
+    # Rate limiting — par plan (requêtes/heure)
+    RATE_LIMIT_FREE_UPLOAD: int = 20
+    RATE_LIMIT_FREE_AI: int = 50
+    RATE_LIMIT_STANDARD_UPLOAD: int = 100
+    RATE_LIMIT_STANDARD_AI: int = 200
+    RATE_LIMIT_PREMIUM_UPLOAD: int = 500
+    RATE_LIMIT_PREMIUM_AI: int = 1000
+
+    # Redis + ARQ Worker
+    REDIS_URL: str = "redis://localhost:6379"
+    WORKER_MAX_JOBS: int = 10
+    WORKER_JOB_TIMEOUT: int = 180
+    WORKER_MAX_TRIES: int = 3
+    AI_STEP_TIMEOUT: int = 120
+    OCR_STEP_TIMEOUT: int = 30
+
+    # Storage Backend
+    STORAGE_BACKEND: str = "local"          # "local" | "s3"
+    S3_BUCKET: str = ""
+    S3_REGION: str = "us-east-1"
+    S3_ENDPOINT_URL: str = ""               # vide = AWS, sinon MinIO/R2
+    S3_ACCESS_KEY: str = ""
+    S3_SECRET_KEY: str = ""
+    S3_PREFIX: str = "imago"
+    SIGNED_URL_SECRET: str = "changez-moi-signed-url"
+
+    @field_validator("CORS_ORIGINS", mode="before")
+    @classmethod
+    def parse_cors(cls, v):
+        if isinstance(v, str):
+            try:
+                return json.loads(v)
+            except Exception:
+                return [v]
+        return v
+
+    @property
+    def upload_path(self) -> Path:
+        p = Path(self.UPLOAD_DIR)
+        p.mkdir(parents=True, exist_ok=True)
+        return p
+
+    @property
+    def thumbnails_path(self) -> Path:
+        p = Path(self.THUMBNAILS_DIR)
+        p.mkdir(parents=True, exist_ok=True)
+        return p
+
+    @property
+    def max_upload_bytes(self) -> int:
+        return self.MAX_UPLOAD_SIZE_MB * 1024 * 1024
+
+    model_config = {"env_file": ".env", "case_sensitive": True, "extra": "ignore"}
+
+
+settings = Settings()