Add option to output to file

README.md

@@ -7,22 +7,55 @@ When started, it does the following:
 - Creates a STAC item with assets. The assets `href` is based on the given URL.
 - Adds the STAC item to a STAC catalog. If an item with the same id already exists, it will be updated.
 
+## Installation
+
+Install the package using pip:
+
+```bash
+# Install from source
+pip install .
+
+# Or install in editable mode for development
+pip install -e .
+```
+
+After installation, the `eopf-stac` command will be available in your environment.
+
 ## Usage
 
 The EOPF product must be referenced by an URL which must be provided as a command-line argument. Only `http(s)://`, `s3://` and `file://` URLs are supported. For debugging, a combination of the `--dry-run` and `--debug` option can be used to see the created STAC item in the logs without inserting it into a catalog.
 
 ```bash
-$ python src/eopf_stac/main.py --help
-usage: eopf-stac.py [-h] [--dry-run] [--debug] URL
+$ eopf-stac --help
+usage: eopf-stac.py [-h] [--source-uri SOURCE_URI] [--dry-run] [--output-file OUTPUT_FILE] [--debug] URL
 
 positional arguments:
-  URL         Local file path or HTTP/S3 URL to the EOPF product.
+  URL         Local file path or URL to the EOPF product
 
 options:
-  -h, --help   show this help message and exit  
-  --source-uri SOURCE_URI Reference to the original product which was input for the EOPF conversion
-  --dry-run    Create STAC item only. Do not insert it into the catalog
-  --debug      Enable verbose output
+  -h, --help            show this help message and exit
+  --source-uri SOURCE_URI
+                        Reference to the original product which was input for the EOPF conversion
+  --dry-run             Create STAC item without trying to insert it into the catalog
+  --output-file OUTPUT_FILE
+                        Save the STAC item as JSON to the specified file path
+  --debug               Enable verbose output
+```
+
+Example usage:
+
+```bash
+# Register STAC item to catalog
+eopf-stac s3://path/to/eopf.zarr
+
+# Save STAC item to local file instead of registering
+eopf-stac --output-file item.json s3://path/to/eopf.zarr
+
+# Dry run with debug output (only logs, doesn't save or register)
+eopf-stac --dry-run --debug s3://path/to/eopf.zarr
+
+# With source URI
+eopf-stac --source-uri s3://original/product.nc s3://path/to/eopf.zarr
 ```
 
 ## Settings 
@@ -34,7 +67,7 @@ Additional settings need to be provided through the following environment variab
 | AWS_ACCESS_KEY_ID | If an s3 URL is provided, the access key for the object storage where the EOPF product is stored. | None |
 | AWS_SECRET_ACCESS_KEY | If an s3 URL is provided, the secret for the access key. | None |
 | S3_ENDPOINT_URL | If an s3 URL is provided, the endpoint URL of the object storage  | None |
-| STAC_API_URL | The URL of the STAC catalog to register the created STAC item  | None |
+| STAC_API_URL | The URL of the STAC catalog to register the created STAC item. Not required if `--output-file` is used. | None |
 | STAC_INGEST_USER | The username to access the transaction endpoints of the STAC API with HTTP Basic Auth | None |
 | STAC_INGEST_PASS | The password to access the transaction endpoints of the STAC API with HTTP Basic Auth | None |
 

pyproject.toml

@@ -28,6 +28,9 @@ dependencies = [
     "netCDF4 == 1.7.2",
     "footprint-facility"
 ]
+[project.scripts]
+eopf-stac = "eopf_stac.main:main"
+
 [project.optional-dependencies]
 dev = [
     "ruff"

src/eopf_stac/main.py

@@ -3,6 +3,7 @@
 import logging
 import os
 from sys import exit
+from typing import Optional
 
 from eopf_stac.io import create_item, read_metadata, register_item
 
@@ -25,7 +26,7 @@ def configure_logging(level: int):
     )
 
 
-def validate_env(url: str, dry_run: bool, env: dict):
+def validate_env(url: str, dry_run: bool, output_file: Optional[str], env):
     if url.startswith("s3://"):
         # if s3 url is provided, the credentials are required?
         missing_vars = []
@@ -41,7 +42,7 @@ def validate_env(url: str, dry_run: bool, env: dict):
         if len(missing_vars) > 0:
             raise ValueError(f"The following enviroment variables are missing: {missing_vars}")
 
-    if not dry_run:
+    if not dry_run and not output_file:
         if ENV_STAC_API_URL not in env:
             raise ValueError(f"The enviroment variable {ENV_STAC_API_URL} is missing")
 
@@ -62,6 +63,7 @@ def main():
     parser.add_argument(
         "--dry-run", help="Create STAC item without trying to insert it into the catalog", action="store_true"
     )
+    parser.add_argument("--output-file", help="Save the STAC item as JSON to the specified file path", type=str)
     parser.add_argument("--debug", help="Enable verbose output", action="store_true")
     args = parser.parse_args()
 
@@ -71,7 +73,7 @@ def main():
         configure_logging(logging.INFO)
 
     try:
-        validate_env(args.URL, args.dry_run, env=os.environ)
+        validate_env(args.URL, args.dry_run, args.output_file, os.environ)
 
         logger.debug("Opening metadata file ...")
         metadata = read_metadata(args.URL)
@@ -81,7 +83,13 @@ def main():
         logger.debug(json.dumps(item.to_dict(), indent=4))
 
         if not args.dry_run:
-            item = register_item(item=item, stac_api_url=os.environ[ENV_STAC_API_URL])
+            if args.output_file:
+                logger.info(f"Writing STAC item to {args.output_file}")
+                with open(args.output_file, "w") as f:
+                    json.dump(item.to_dict(), f, indent=4)
+            else:
+                logger.info(f"Registering STAC item to {os.environ[ENV_STAC_API_URL]}")
+                item = register_item(item=item, stac_api_url=os.environ[ENV_STAC_API_URL])
 
     except Exception as e:
         logger.error(str(e))