commit 7deffc93a4431428106b9dd3996d86aa326d0349
Author: lash <dev@holbrook.no>
Date:   Thu Aug 31 14:21:43 2023 +0100

    initial commit

diff --git a/gas3/__init__.py b/gas3/__init__.py
new file mode 100644
index 0000000..eec0ee1
--- /dev/null
+++ b/gas3/__init__.py
@@ -0,0 +1,58 @@
+# standard imports
+import os
+import urllib.parse
+import logging
+import re
+
+# external imports
+from leveldir.uuid import UUIDDir
+
+# local imports
+from gas3.base import do_yield
+from gas3.register import do_register
+import gas3.error
+
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+data_path = os.environ.get('GAS3_DATA_DIR', 'data')
+data_dir = UUIDDir(data_path)
+
+re_yield = re.compile('^/yield')
+re_register = re.compile('^/register')
+
+
+def application(env, start_response):
+    req = urllib.parse.urlparse(env['REQUEST_URI'])
+    scode = 200
+    stext = 'OK'
+    
+    r = ''
+    if re.match(re_yield, req.path):
+        r = do_yield(req, env, data_dir)
+    elif re.match(re_register, req.path):
+        try:
+            r = do_register(req, env, data_dir)
+        except gas3.error.Used:
+            scode = 410
+            stext = 'Code already used'
+        except gas3.error.InvalidInput as e:
+            scode = 400
+            stext = 'Malformed request url'
+            r = str(e)
+        except FileNotFoundError:
+            scode = 403
+            stext = 'No such code'
+        except Exception as e:
+            scode = 500
+            stext = 'Server error'
+            r = str(e)
+    else:
+        r = ''
+
+    
+    l = len(r)
+    status = str(scode) + ' ' + stext
+    start_response(status, [('Content-Length', str(l))])
+    return [r.encode('utf-8')]
diff --git a/gas3/base.py b/gas3/base.py
new file mode 100644
index 0000000..5ddd5eb
--- /dev/null
+++ b/gas3/base.py
@@ -0,0 +1,19 @@
+# standard imports
+import uuid
+import logging
+
+logg = logging.getLogger(__name__)
+
+
+def do_yield(req, env, data_dir):
+    u = uuid.uuid4()
+    data_dir.add(u, b'\x00')
+    return str(u)
+
+
+def check(s, data_dir):
+    p = data_dir.to_filepath(s)
+    f = open(p, 'rb')
+    r = f.read(20)
+    f.close()
+    return len(r) == 1
diff --git a/gas3/error.py b/gas3/error.py
new file mode 100644
index 0000000..1b15b86
--- /dev/null
+++ b/gas3/error.py
@@ -0,0 +1,6 @@
+class InvalidInput(Exception):
+    pass
+
+
+class Used(Exception):
+    pass
diff --git a/gas3/register.py b/gas3/register.py
new file mode 100644
index 0000000..535aa68
--- /dev/null
+++ b/gas3/register.py
@@ -0,0 +1,39 @@
+# standard imports
+import logging
+
+# external imports
+from chainlib.eth.address import to_checksum_address
+from hexathon import strip_0x
+
+# local imports
+from gas3.error import InvalidInput
+from gas3.error import Used
+from gas3.base import check
+
+logg = logging.getLogger(__name__)
+
+
+def register_address(a):
+    pass
+
+def do_register(req, env, data_dir):
+    i = req.path.find('/', 1)
+    if i == -1:
+        raise InvalidInput(env.path)
+    p = req.path[i+1:]
+    r = None
+    r = check(p, data_dir)
+    if not r:
+        raise Used('already used: ' + p)
+   
+    v = env['wsgi.input'].read(42)
+    if type(v) == bytes:
+        v = v.decode('utf-8')
+    try:
+        v = strip_0x(v)
+        v = to_checksum_address(v)
+    except:
+        raise InvalidInput('invalid address: ' + str(v))
+
+    data_dir.add(p, bytes.fromhex(v))
+    return v
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..241151f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+leveldir~=0.3.3rc1
+chainlib-eth~=0.5.2
diff --git a/test_requirements.txt b/test_requirements.txt
new file mode 100644
index 0000000..fceb5cd
--- /dev/null
+++ b/test_requirements.txt
@@ -0,0 +1,4 @@
+eth_tester==0.5.0b3
+py-evm==0.3.0a20
+rlp==2.0.1
+coverage==5.5
diff --git a/tests/test_register.py b/tests/test_register.py
new file mode 100644
index 0000000..b288e92
--- /dev/null
+++ b/tests/test_register.py
@@ -0,0 +1,59 @@
+# standard imports
+import io
+import os
+import unittest
+import tempfile
+import shutil
+import logging
+import urllib.parse
+
+# external imports
+from chainlib.eth.unittest.ethtester import EthTesterCase
+from hexathon import same as is_same_hex
+from leveldir.uuid import UUIDDir
+from gas3.base import do_yield
+from gas3.base import check
+from gas3.register import do_register
+import gas3.error
+
+logging.basicConfig(level=logging.DEBUG)
+
+
+class TestRegister(EthTesterCase):
+
+    def setUp(self):
+        super(TestRegister, self).setUp()
+        self.data_path = tempfile.mkdtemp()
+        self.data_dir = UUIDDir(self.data_path)
+   
+
+    def test_yield(self):
+        u = do_yield(None, {}, self.data_dir)
+        p = check(u, self.data_dir)
+        self.assertTrue(os.path.exists(p))
+
+
+    def test_register(self):
+        u = do_yield(None, {}, self.data_dir)
+        req = urllib.parse.urlparse('http://localhost/register/' + u)
+        address_file = io.StringIO()
+        address_file.write(self.accounts[0] + '\n')
+        address_file.seek(0)
+        env = {
+            'wsgi.input': address_file,
+                }
+        r = do_register(req, env, self.data_dir)
+        self.assertEqual(len(r), 40)
+        with self.assertRaises(gas3.error.Used):
+            r = do_register(req, env, self.data_dir)
+
+        fp = self.data_dir.to_filepath(u)
+        f = open(fp, 'rb')
+        r = f.read()
+        f.close()
+        self.assertTrue(is_same_hex(r.hex(), self.accounts[0]))
+
+
+
+if __name__ == '__main__':
+    unittest.main()