Build Windows releases with openssl; automate external libraries

External libraries for Windows are now built automatically in the
qpdf/external-libs repository and include openssl in addition to zlib
and jpeg. Use these, and update the Windows build to build with the
openssl crypto provider by default. We leave the native crypto
provider enabled in case there is a problem with openssl and also to
continue to exercise that code.

1 files changed, 56 insertions, 0 deletions

diff --git a/build-scripts/download-external-libs b/build-scripts/download-external-libs
new file mode 100755
index 00000000..94d3ff52
--- /dev/null
+++ b/build-scripts/download-external-libs
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+import json
+import os
+import requests
+import sys
+from zipfile import ZipFile
+from operator import itemgetter
+
+
+def warn(*args, **kwargs):
+    print(*args, **kwargs, file=sys.stderr)
+
+
+def download_file(url, local_filename):
+    # From https://stackoverflow.com/questions/16694907/
+    # download-large-file-in-python-with-requests
+    if os.path.exists(local_filename):
+        warn('Using existing', local_filename)
+        return
+    warn('Downloading', local_filename)
+    with requests.get(url, stream=True) as r:
+        r.raise_for_status()
+        with open(local_filename, 'wb') as f:
+            for chunk in r.iter_content(chunk_size=8192):
+                f.write(chunk)
+    return local_filename
+
+
+bin_name = 'qpdf-external-libs-bin.zip'
+src_name = 'qpdf-external-libs-src.zip'
+dir_name = 'external-libs-dist'
+os.makedirs(dir_name, exist_ok=True)
+
+r = requests.get(
+    'https://api.github.com/repos/qpdf/external-libs/releases')
+releases = json.loads(r.text)
+by_tag = sorted(
+    [(r['tag_name'], r) for r in releases
+     if r['prerelease'] is False],
+    reverse=True)
+latest = by_tag[0][1]
+bin_url = None
+src_url = None
+for i in latest['assets']:
+    if i['name'] == bin_name:
+        bin_url = i['browser_download_url']
+    elif i['name'] == src_name:
+        src_url = i['browser_download_url']
+print(bin_url)
+download_file(bin_url, f'{dir_name}/{bin_name}')
+download_file(src_url, f'{dir_name}/{src_name}')
+
+print('\n** external library information **')
+with ZipFile(f'{dir_name}/{src_name}') as z1:
+    with z1.open('external-libs-src/versions') as z2:
+        print(z2.read().decode())