Check multiple SSW mirrors for remote psf files (#178)

* check multiple ssw mirrors for remote psf files

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

xrtpy/util/__init__.py

@@ -5,3 +5,8 @@
     "epoch",
     "time",
 ]
+
+_SSW_MIRRORS = [
+    "https://sohoftp.nascom.nasa.gov/solarsoft/",
+    "https://hesperia.gsfc.nasa.gov/ssw/",
+]

xrtpy/util/xrt_deconvolve.py

@@ -11,19 +11,24 @@
 from sunpy.image.resample import resample
 from sunpy.image.transform import affine_transform
 from sunpy.map import Map
+from urllib.parse import urljoin
+
+from xrtpy.util import _SSW_MIRRORS
 
 
 @manager.require(
     "PSF560.fits",
     [
-        "https://sohoftp.nascom.nasa.gov/solarsoft/hinode/xrt/idl/util/XRT20170324_151721.0.PSF560.fits"
+        urljoin(mirror, "hinode/xrt/idl/util/XRT20170324_151721.0.PSF560.fits")
+        for mirror in _SSW_MIRRORS
     ],
     "0eaa5da6fb69661e7f46d1f0c463e4b3b1745426a399a4fbc53fc0c0ae87dd0d",
 )
 @manager.require(
     "PSF1000.fits",
     [
-        "https://sohoftp.nascom.nasa.gov/solarsoft/hinode/xrt/idl/util/XRT20170324_161721.0.PSF1000.fits"
+        urljoin(mirror, "hinode/xrt/idl/util/XRT20170324_161721.0.PSF1000.fits")
+        for mirror in _SSW_MIRRORS
     ],
     "95590a7174692977a2f111b932811c9c7ae105a59b93bfe6c96fba862cefacf1",
 )