move PaytoParse logic into taler-util (#6650)

1 files changed, 47 insertions, 0 deletions

diff --git a/taler/util/payto.py b/taler/util/payto.py
new file mode 100644
index 0000000..a208028
--- /dev/null
+++ b/taler/util/payto.py
@@ -0,0 +1,47 @@
+# This file is part of GNU Taler
+# (C) 2017-2020 Taler Systems SA
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 3 of the License, or (at your option) any later
+# version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free
+# Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+# Boston, MA  02110-1301  USA
+#
+# @author Marcello Stanisci
+# @version 0.1
+# @repository https://git.taler.net/taler-util.git/
+
+import re
+from urllib.parse import urlparse, parse_qsl
+from .amount import Amount
+
+class PaytoFormatError(Exception):
+    def __init__(self, msg):
+        super(PaytoFormatError, self).__init__(msg)
+        self.msg = msg
+
+class PaytoParse:
+    def __init__(self, payto_uri):
+        obj = urlparse(payto_uri)
+        path = obj.path.split("/")
+        if obj.scheme != "payto" or \
+                len(path) != 3 or \
+                not obj.netloc or \
+                not re.match("^payto://", payto_uri):
+            raise PaytoFormatError(f"Bad Payto URI: {payto_uri}")
+        self.target = path.pop()
+        self.bank = path.pop()
+        self.authority = obj.netloc
+        params = dict(parse_qsl(obj.query))
+        self.message = params.get("message")
+        self.amount = Amount.parse(params.get("amount")) if "amount" in params else None