Store PackageFinder.trusted_hosts instead of secure_origins.

src/pip/_internal/build_env.py

@@ -185,7 +185,7 @@ class BuildEnvironment(object):
             args.append('--no-index')
         for link in finder.find_links:
             args.extend(['--find-links', link])
-        for _, host, _ in finder.secure_origins:
+        for host in finder.trusted_hosts:
             args.extend(['--trusted-host', host])
         if finder.allow_all_prereleases:
             args.append('--pre')

src/pip/_internal/index.py

@@ -42,8 +42,8 @@ from pip._internal.wheel import Wheel
 if MYPY_CHECK_RUNNING:
     from logging import Logger
     from typing import (
-        Tuple, Optional, Any, List, Union, Callable, Set, Sequence,
-        Iterable, MutableMapping
+        Any, Callable, Iterable, Iterator, List, MutableMapping, Optional,
+        Sequence, Set, Tuple, Union,
     )
     from pip._vendor.packaging.version import _BaseVersion
     from pip._vendor.requests import Response
@@ -562,9 +562,9 @@ class PackageFinder(object):
         candidate_evaluator,  # type: CandidateEvaluator
         find_links,  # type: List[str]
         index_urls,  # type: List[str]
-        secure_origins,  # type: List[SecureOrigin]
         session,  # type: PipSession
         format_control=None,  # type: Optional[FormatControl]
+        trusted_hosts=None,   # type: Optional[List[str]]
     ):
         # type: (...) -> None
         """
@@ -577,14 +577,17 @@ class PackageFinder(object):
             the selection of source packages / binary packages when consulting
             the index and links.
         """
+        if trusted_hosts is None:
+            trusted_hosts = []
+
         format_control = format_control or FormatControl(set(), set())
 
         self.candidate_evaluator = candidate_evaluator
         self.find_links = find_links
         self.index_urls = index_urls
-        self.secure_origins = secure_origins
         self.session = session
         self.format_control = format_control
+        self.trusted_hosts = trusted_hosts
 
         # These are boring links that have already been logged somehow.
         self._logged_links = set()  # type: Set[Link]
@@ -595,7 +598,7 @@ class PackageFinder(object):
         find_links,  # type: List[str]
         index_urls,  # type: List[str]
         allow_all_prereleases=False,  # type: bool
-        trusted_hosts=None,  # type: Optional[Iterable[str]]
+        trusted_hosts=None,  # type: Optional[List[str]]
         session=None,  # type: Optional[PipSession]
         format_control=None,  # type: Optional[FormatControl]
         target_python=None,  # type: Optional[TargetPython]
@@ -636,11 +639,6 @@ class PackageFinder(object):
                     link = new_link
             built_find_links.append(link)
 
-        secure_origins = [
-            ("*", host, "*")
-            for host in (trusted_hosts if trusted_hosts else [])
-        ]  # type: List[SecureOrigin]
-
         candidate_evaluator = CandidateEvaluator(
             target_python=target_python, prefer_binary=prefer_binary,
             allow_all_prereleases=allow_all_prereleases,
@@ -664,9 +662,9 @@ class PackageFinder(object):
             candidate_evaluator=candidate_evaluator,
             find_links=built_find_links,
             index_urls=index_urls,
-            secure_origins=secure_origins,
             session=session,
             format_control=format_control,
+            trusted_hosts=trusted_hosts,
         )
 
     @property
@@ -678,6 +676,20 @@ class PackageFinder(object):
         # type: () -> None
         self.candidate_evaluator.allow_all_prereleases = True
 
+    def extend_trusted_hosts(self, hosts):
+        # type: (List[str]) -> None
+        for host in hosts:
+            if host in self.trusted_hosts:
+                continue
+            self.trusted_hosts.append(host)
+
+    def iter_secure_origins(self):
+        # type: () -> Iterator[SecureOrigin]
+        for secure_origin in SECURE_ORIGINS:
+            yield secure_origin
+        for host in self.trusted_hosts:
+            yield ('*', host, '*')
+
     def get_formatted_locations(self):
         # type: () -> str
         lines = []
@@ -766,7 +778,7 @@ class PackageFinder(object):
         # Determine if our origin is a secure origin by looking through our
         # hardcoded list of secure origins, as well as any additional ones
         # configured on this PackageFinder instance.
-        for secure_origin in (SECURE_ORIGINS + self.secure_origins):
+        for secure_origin in self.iter_secure_origins():
             if protocol != secure_origin[0] and secure_origin[0] != "*":
                 continue
 

src/pip/_internal/req/req_file.py

@@ -251,8 +251,7 @@ def process_line(
         if opts.pre:
             finder.set_allow_all_prereleases()
         if opts.trusted_hosts:
-            finder.secure_origins.extend(
-                ("*", host, "*") for host in opts.trusted_hosts)
+            finder.extend_trusted_hosts(opts.trusted_hosts)
 
 
 def break_args_options(line):

tests/unit/test_index.py

@@ -163,6 +163,44 @@ class TestPackageFinder:
         assert actual_target_python is target_python
         assert actual_target_python.py_version_info == (3, 7, 3)
 
+    def test_extend_trusted_hosts(self):
+        trusted_hosts = ['host1', 'host2']
+        finder = make_test_finder(trusted_hosts=trusted_hosts)
+
+        # Check that extend_trusted_hosts() prevents duplicates.
+        finder.extend_trusted_hosts(['host2', 'host3', 'host2'])
+        assert finder.trusted_hosts == ['host1', 'host2', 'host3'], (
+            'actual: {}'.format(finder.trusted_hosts)
+        )
+
+    def test_iter_secure_origins(self):
+        trusted_hosts = ['host1', 'host2']
+        finder = make_test_finder(trusted_hosts=trusted_hosts)
+
+        actual = list(finder.iter_secure_origins())
+        assert len(actual) == 8
+        # Spot-check that SECURE_ORIGINS is included.
+        assert actual[0] == ('https', '*', '*')
+        assert actual[-2:] == [
+            ('*', 'host1', '*'),
+            ('*', 'host2', '*'),
+        ]
+
+    def test_iter_secure_origins__none_trusted_hosts(self):
+        """
+        Test iter_secure_origins() after passing trusted_hosts=None.
+        """
+        # Use PackageFinder.create() rather than make_test_finder()
+        # to make sure we're really passing trusted_hosts=None.
+        finder = PackageFinder.create(
+            [], [], trusted_hosts=None, session=object(),
+        )
+
+        actual = list(finder.iter_secure_origins())
+        assert len(actual) == 6
+        # Spot-check that SECURE_ORIGINS is included.
+        assert actual[0] == ('https', '*', '*')
+
 
 def test_sort_locations_file_expand_dir(data):
     """

tests/unit/test_req_file.py

@@ -316,7 +316,7 @@ class TestProcessLine(object):
 
     def test_set_finder_trusted_host(self, finder):
         list(process_line("--trusted-host=url", "file", 1, finder=finder))
-        assert finder.secure_origins == [('*', 'url', '*')]
+        assert finder.trusted_hosts == ['url']
 
     def test_noop_always_unzip(self, finder):
         # noop, but confirm it can be set