Revert version changes & figure out how to indent without py3.9 or lx…

…ml>=4.5

hls_vi/generate_metadata.py

@@ -3,6 +3,7 @@
 import os
 import re
 import sys
+from xml.dom import minidom
 
 from datetime import datetime, timezone
 from pathlib import Path
@@ -136,22 +137,25 @@ def generate_metadata(input_dir: Path, output_dir: Path) -> None:
         input_granule_ur,
     )
 
-    # ensure any added attributes are indented
-    ET.indent(tree)
-
     with (
         importlib_resources.files("hls_vi")
         / "schema"
         / "Granule.xsd"  # pyright: ignore[reportOperatorIssue]
     ).open() as xsd:
         ET.XMLSchema(file=xsd).assertValid(tree)
 
-    tree.write(
-        str(output_dir / metadata_path.name.replace("HLS", "HLS-VI")),
-        encoding="utf-8",
-        xml_declaration=True,
+    # Python 3.9 or `lxml==4.5` add an `indent()` function to nicely format our XML
+    # Alas we cannot use those yet, so rely on this approach using `xml.dom.minidom`
+    dom = minidom.parseString(
+        ET.tostring(tree, xml_declaration=True, pretty_print=False)
+    )
+    pretty_xml = os.linesep.join(
+        [line for line in dom.toprettyxml(indent="  ").splitlines() if line.strip()]
     )
 
+    dest = output_dir / metadata_path.name.replace("HLS", "HLS-VI")
+    dest.write_text(pretty_xml, encoding="utf-8")
+
 
 def normalize_additional_attributes(container: ElementBase) -> None:
     """Normalize additional attribute values.

setup.py

@@ -9,10 +9,8 @@
         "dataclasses",
         "geojson",
         "importlib_resources",
-        "lxml==5.3.0",
-        # 1.19 is latest for our container, but ~1.19 allows
-        # a more recent 1.x version for our host
-        "numpy~=1.19",
+        "lxml==3.6.0",
+        "numpy~=1.19.0",
         "pystac[validation]==1.0.0rc2",
         "rasterio",
         "shapely",