backend: add support for pulp domains

The pulp.stage.devshift.net instance has domains enabled while our STG
instance has them disabled. As long as it is easy to support both
cases, I'd do that.

backend/copr_backend/pulp.py

@@ -5,7 +5,6 @@
 import os
 import tomllib
 import requests
-from six.moves.urllib.parse import urlencode
 
 
 class PulpClient:
@@ -53,7 +52,20 @@ def url(self, endpoint):
         """
         A fully qualified URL for a given API endpoint
         """
-        return self.config["base_url"] + self.config["api_root"] + endpoint
+        domain = self.config["domain"]
+        if domain == "default":
+            domain = ""
+
+        relative = os.path.normpath("/".join([
+            self.config["api_root"],
+            domain,
+            endpoint,
+        ]))
+
+        # Normpath removes the trailing slash. If it was there, put it back
+        if endpoint[-1] == "/":
+            relative += "/"
+        return self.config["base_url"] + relative
 
     @property
     def request_params(self):
@@ -79,7 +91,7 @@ def get_repository(self, name):
         # There is no endpoint for querying a single repository by its name,
         # even Pulp CLI does this workaround
         url = self.url("api/v3/repositories/rpm/rpm/?")
-        url += urlencode({"name": name, "offset": 0, "limit": 1})
+        url += self._urlencode({"name": name, "offset": 0, "limit": 1})
         return requests.get(url, **self.request_params)
 
     def get_distribution(self, name):
@@ -90,9 +102,19 @@ def get_distribution(self, name):
         # There is no endpoint for querying a single repository by its name,
         # even Pulp CLI does this workaround
         url = self.url("api/v3/distributions/rpm/rpm/?")
-        url += urlencode({"name": name, "offset": 0, "limit": 1})
+        url += self._urlencode({"name": name, "offset": 0, "limit": 1})
         return requests.get(url, **self.request_params)
 
+    def _urlencode(self, query):
+        """
+        Join a dict into URL query string but don't encode special characters
+        https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urlencode
+        Our repository names are e.g. frostyx/test-pulp/fedora-39-x86_64.
+        The standard urlencode would change the slashes to %2F making Pulp to
+        not find the project when filtering by name.
+        """
+        return "&".join([f"{k}={v}" for k, v in query.items()])
+
     def create_distribution(self, name, repository, basepath=None):
         """
         Create an RPM distribution

backend/tests/test_pulp.py

@@ -0,0 +1,39 @@
+"""
+Test Pulp client
+"""
+
+# pylint: disable=attribute-defined-outside-init
+
+from copr_backend.pulp import PulpClient
+
+
+class TestPulp:
+
+    def setup_method(self, _method):
+        self.config = {
+            "api_root": "/pulp/",
+            "base_url": "http://pulp.fpo:24817",
+            "cert": "",
+            "domain": "default",
+            "dry_run": False,
+            "format": "json",
+            "key": "",
+            "password": "1234",
+            "timeout": 0,
+            "username": "admin",
+            "verbose": 0,
+            "verify_ssl": True,
+        }
+
+    def test_url(self):
+        client = PulpClient(self.config)
+        assert self.config["domain"] == "default"
+        assert client.url("api/v3/artifacts/")\
+            == "http://pulp.fpo:24817/pulp/api/v3/artifacts/"
+
+        assert client.url("api/v3/repositories/rpm/rpm/?")\
+            == "http://pulp.fpo:24817/pulp/api/v3/repositories/rpm/rpm/?"
+
+        self.config["domain"] = "copr"
+        assert client.url("api/v3/artifacts/")\
+            == "http://pulp.fpo:24817/pulp/copr/api/v3/artifacts/"