| 1 | #!/usr/bin/env python3 |
| 2 | """ |
| 3 | Stability AI image generation backend. |
| 4 | |
| 5 | Configuration keys: |
| 6 | STABILITY_API_KEY (required) |
| 7 | STABILITY_BASE_URL (optional) |
| 8 | STABILITY_MODEL (optional) |
| 9 | """ |
| 10 | |
| 11 | import sys |
| 12 | from pathlib import Path |
| 13 | |
| 14 | _SCRIPTS_DIR = Path(__file__).resolve().parents[1] |
| 15 | if str(_SCRIPTS_DIR) not in sys.path: |
| 16 | sys.path.insert(0, str(_SCRIPTS_DIR)) |
| 17 | |
| 18 | from console_encoding import configure_utf8_stdio # noqa: E402 |
| 19 | |
| 20 | configure_utf8_stdio() |
| 21 | |
| 22 | if __name__ == "__main__": |
| 23 | print(__doc__) |
| 24 | print("Use via: python3 skills/ppt-master/scripts/image_gen.py \"prompt\" --backend stability") |
| 25 | raise SystemExit(0 if any(arg in {"-h", "--help", "help"} for arg in sys.argv[1:]) else 1) |
| 26 | |
| 27 | import os |
| 28 | import time |
| 29 | |
| 30 | import requests |
| 31 | |
| 32 | from image_backends.backend_common import ( |
| 33 | MAX_RETRIES, |
| 34 | http_error, |
| 35 | is_permanent_error, |
| 36 | is_rate_limit_error, |
| 37 | normalize_image_size, |
| 38 | report_resolution, |
| 39 | require_api_key, |
| 40 | resolve_output_path, |
| 41 | retry_delay, |
| 42 | ) |
| 43 | |
| 44 | |
| 45 | VALID_ASPECT_RATIOS = [ |
| 46 | "1:1", "2:3", "3:2", "4:5", "5:4", |
| 47 | "9:16", "16:9", "9:21", "21:9", |
| 48 | ] |
| 49 | |
| 50 | DEFAULT_BASE_URL = "https://api.stability.ai" |
| 51 | DEFAULT_MODEL = "stable-image-core" |
| 52 | |
| 53 | MODEL_ENDPOINTS = { |
| 54 | "core": "/v2beta/stable-image/generate/core", |
| 55 | "stable-image-core": "/v2beta/stable-image/generate/core", |
| 56 | "ultra": "/v2beta/stable-image/generate/ultra", |
| 57 | "stable-image-ultra": "/v2beta/stable-image/generate/ultra", |
| 58 | } |
| 59 | |
| 60 | |
| 61 | def _validate_request_options(aspect_ratio: str, image_size: str) -> None: |
| 62 | """Validate unified request options before any retryable work.""" |
| 63 | if aspect_ratio not in VALID_ASPECT_RATIOS: |
| 64 | raise ValueError( |
| 65 | f"Unsupported aspect ratio '{aspect_ratio}' for Stability backend. " |
| 66 | f"Supported: {VALID_ASPECT_RATIOS}" |
| 67 | ) |
| 68 | normalized_size = normalize_image_size(image_size) |
| 69 | if normalized_size != "1K": |
| 70 | raise ValueError( |
| 71 | "Stability Core and Ultra generation only support the default '1K' preset; " |
| 72 | f"got '{image_size}'. Use a Stability upscale endpoint for larger output." |
| 73 | ) |
| 74 | |
| 75 | |
| 76 | def _resolve_endpoint(model: str | None, base_url: str) -> tuple[str, str]: |
| 77 | """Resolve the Stability model alias and endpoint URL.""" |
| 78 | resolved_model = model or DEFAULT_MODEL |
| 79 | |
| 80 | normalized_model = resolved_model.lower() |
| 81 | endpoint = MODEL_ENDPOINTS.get(normalized_model) |
| 82 | if not endpoint: |
| 83 | supported = sorted(MODEL_ENDPOINTS) |
| 84 | raise ValueError( |
| 85 | f"Unsupported Stability model '{resolved_model}'. Supported aliases: {supported}" |
| 86 | ) |
| 87 | return normalized_model, base_url.rstrip("/") + endpoint |
| 88 | |
| 89 | |
| 90 | def _generate_image(api_key: str, prompt: str, |
| 91 | aspect_ratio: str = "1:1", image_size: str = "1K", |
| 92 | output_dir: str = None, filename: str = None, |
| 93 | model: str | None = None, base_url: str = DEFAULT_BASE_URL) -> str: |
| 94 | """Generate one image with the Stability backend.""" |
| 95 | _validate_request_options(aspect_ratio, image_size) |
| 96 | |
| 97 | resolved_model, url = _resolve_endpoint(model, base_url) |
| 98 | headers = { |
| 99 | "Authorization": f"Bearer {api_key}", |
| 100 | "Accept": "image/*", |
| 101 | } |
| 102 | data = { |
| 103 | "prompt": prompt, |
| 104 | "aspect_ratio": aspect_ratio, |
| 105 | "output_format": "png", |
| 106 | } |
| 107 | |
| 108 | print("[Stability AI]") |
| 109 | print(f" Model: {resolved_model}") |
| 110 | print(f" Prompt: {prompt[:120]}{'...' if len(prompt) > 120 else ''}") |
| 111 | print(f" Aspect Ratio: {aspect_ratio}") |
| 112 | print(f" Preset Size: {image_size}") |
| 113 | print() |
| 114 | print(" [..] Generating...", end="", flush=True) |
| 115 | start = time.time() |
| 116 | |
| 117 | response = requests.post( |
| 118 | url, |
| 119 | headers=headers, |
| 120 | data=data, |
| 121 | files={"none": ""}, |
| 122 | timeout=300, |
| 123 | ) |
| 124 | elapsed = time.time() - start |
| 125 | print(f"\n [DONE] Response received ({elapsed:.1f}s)") |
| 126 | |
| 127 | if response.status_code != 200: |
| 128 | raise http_error(response, "Stability generation") |
| 129 | |
| 130 | path = resolve_output_path(prompt, output_dir, filename, ".png") |
| 131 | with open(path, "wb") as f: |
| 132 | f.write(response.content) |
| 133 | print(f" File saved to: {path}") |
| 134 | report_resolution(path) |
| 135 | return path |
| 136 | |
| 137 | |
| 138 | def generate(prompt: str, |
| 139 | aspect_ratio: str = "1:1", image_size: str = "1K", |
| 140 | output_dir: str = None, filename: str = None, |
| 141 | model: str = None, max_retries: int = MAX_RETRIES) -> str: |
| 142 | """Generate an image with retries using the Stability backend.""" |
| 143 | base_url = os.environ.get("STABILITY_BASE_URL") or DEFAULT_BASE_URL |
| 144 | resolved_model = model or os.environ.get("STABILITY_MODEL") |
| 145 | _validate_request_options(aspect_ratio, image_size) |
| 146 | _resolve_endpoint(resolved_model, base_url) |
| 147 | api_key = require_api_key( |
| 148 | "STABILITY_API_KEY", |
| 149 | message="No API key found. Set STABILITY_API_KEY in the current environment or a .env file.", |
| 150 | ) |
| 151 | |
| 152 | last_error = None |
| 153 | for attempt in range(max_retries + 1): |
| 154 | try: |
| 155 | return _generate_image( |
| 156 | api_key=api_key, |
| 157 | prompt=prompt, |
| 158 | aspect_ratio=aspect_ratio, |
| 159 | image_size=image_size, |
| 160 | output_dir=output_dir, |
| 161 | filename=filename, |
| 162 | model=resolved_model, |
| 163 | base_url=base_url, |
| 164 | ) |
| 165 | except Exception as exc: |
| 166 | last_error = exc |
| 167 | if is_permanent_error(exc): |
| 168 | raise |
| 169 | if attempt >= max_retries: |
| 170 | break |
| 171 | limited = is_rate_limit_error(exc) |
| 172 | delay = retry_delay(attempt, rate_limited=limited) |
| 173 | label = "Rate limit hit" if limited else f"Error: {exc}" |
| 174 | print(f"\n [WARN] {label}. Retrying in {delay}s...") |
| 175 | time.sleep(delay) |
| 176 | |
| 177 | raise RuntimeError(f"Failed after {max_retries + 1} attempts. Last error: {last_error}") |
| 178 |