Prepare scripts for aggregated signatures:

 - fetch file signatures in contrib/add_cosigner.
 - detect cosigners in make_download.
 - format download page for aggregated signatures.

contrib/add_cosigner

@@ -0,0 +1,45 @@
+#!/usr/bin/python3
+import re
+import os
+import sys
+import importlib
+
+# load version.py; needlessly complicated alternative to "imp.load_source":
+version_spec = importlib.util.spec_from_file_location('version', 'electrum/version.py')
+version_module = importlib.util.module_from_spec(version_spec)
+version_spec.loader.exec_module(version_module)
+
+ELECTRUM_VERSION = version_module.ELECTRUM_VERSION
+APK_VERSION = version_module.APK_VERSION
+print("version", ELECTRUM_VERSION)
+
+# GPG names of cosigner
+cosigner = sys.argv[1]
+
+version = version_win = version_mac = version_android = ELECTRUM_VERSION
+
+files = {
+    'tgz': "Electrum-%s.tar.gz" % version,
+    'appimage': "electrum-%s-x86_64.AppImage" % version,
+    'mac': "electrum-%s.dmg" % version_mac,
+    'win': "electrum-%s.exe" % version_win,
+    'win_setup': "electrum-%s-setup.exe" % version_win,
+    'win_portable': "electrum-%s-portable.exe" % version_win,
+    'apk_arm64': "Electrum-%s-arm64-v8a-release.apk" % APK_VERSION,
+    'apk_armeabi': "Electrum-%s-armeabi-v7a-release.apk" % APK_VERSION,
+}
+
+
+for k, n in files.items():
+    path = "dist/%s"%n
+    link = "https://download.electrum.org/%s/%s"%(version,n)
+    if not os.path.exists(path):
+        os.system("wget -q %s -O %s" % (link, path))
+    if not os.path.getsize(path):
+        raise Exception(path)
+    sig_name = n + '.'+cosigner+'.asc'
+    sig_url = "https://raw.githubusercontent.com/spesmilo/electrum-signatures/master/%s/%s/%s"%(version, n, sig_name)
+    sig_path = "dist/%s"% sig_name
+    os.system("wget -nc %s -O %s"%(sig_url, sig_path))
+    if os.system("gpg --verify %s %s"%(sig_path, path)) != 0:
+        raise Exception(sig_name)

contrib/make_download

@@ -3,6 +3,7 @@ import re
 import os
 import sys
 import importlib
+from collections import defaultdict
 
 # load version.py; needlessly complicated alternative to "imp.load_source":
 version_spec = importlib.util.spec_from_file_location('version', 'electrum/version.py')
@@ -15,9 +16,6 @@ print("version", ELECTRUM_VERSION)
 
 dirname = sys.argv[1]
 
-# GPG names of extra signers
-extra_signers = sys.argv[2:]
-
 print("directory", dirname)
 
 download_page = os.path.join(dirname, "panel-download.html")
@@ -44,33 +42,35 @@ files = {
     'apk_armeabi': "Electrum-%s-armeabi-v7a-release.apk" % APK_VERSION,
 }
 
+# default signers
+signers = ['ThomasV', 'SomberNight']
 
-for k, n in files.items():
-    path = "dist/%s"%n
-    link = "https://download.electrum.org/%s/%s"%(version,n)
-    if not os.path.exists(path):
-        os.system("wget -q %s -O %s" % (link, path))
-    if not os.path.getsize(path):
-        raise Exception(path)
+# detect extra signers
+list_dir = os.listdir('dist')
+detected_sigs = defaultdict(set)
+for f in list_dir:
+    if f.endswith('.asc'):
+        parts = f.split('.')
+        signer = parts[-2]
+        filename = '.'.join(parts[0:-2])
+        detected_sigs[signer].add(filename)
+for k, v in detected_sigs.items():
+    if v == set(files.values()):
+        if k not in signers:
+            signers.append(k)
 
-    string = string.replace("##link_%s##"%k, link)
-    sig_ThomasV = link + '.ThomasV.asc'
-    sig_SomberNight = link + '.sombernight_releasekey.asc'
-    sigs = [
-        "<a href=\"%s\">%s</a>"%(sig_ThomasV, 'ThomasV'),
-        "<a href=\"%s\">%s</a>"%(sig_SomberNight, 'SomberNight'),
-    ]
+print("signers:", signers)
 
-    for signer in extra_signers:
-        sig_name = n + '.'+signer+'.asc'
-        sig_url = "https://raw.githubusercontent.com/spesmilo/electrum-signatures/master/%s/%s/%s"%(version, n, sig_name)
-        sig_path = "dist/%s"% sig_name
-        os.system("wget %s -O %s"%(sig_url, sig_path))
-        if os.system("gpg --verify %s %s"%(sig_path, path)) != 0:
-            raise Exception(sig_name)
-        sigs.append( "<a href=\"%s\">%s</a>"%(sig_url, signer) )
-    sigs = '\n'+',\n'.join(sigs)+'\n'
-    string = string.replace("##sigs_%s##"%k, sigs)
+gpg_name = lambda x: 'sombernight_releasekey' if x=='SomberNight' else x
+signers_list = ', '.join("<a href=\"https://raw.githubusercontent.com/spesmilo/electrum/master/pubkeys/%s.asc\">%s</a>"%(gpg_name(x), x) for x in signers)
+string = string.replace("##signers_list##", signers_list)
+
+for k, filename in files.items():
+    path = "dist/%s"%filename
+    assert filename in list_dir
+    link = "https://download.electrum.org/%s/%s"%(version, filename)
+    string = string.replace("##link_%s##"%k, link)
+    string = string.replace("##sigs_%s##"%k, link+'.asc')
 
 with open(download_page,'w') as f:
     f.write(string)