# (C) 2013, James Cammarata <jcammarata@ansible.com>
# Copyright: (c) 2019, Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import annotations

import collections
import datetime
import functools
import hashlib
import json
import os
import stat
import tarfile
import time
import threading

from http import HTTPStatus
from http.client import BadStatusLine, IncompleteRead
from urllib.error import HTTPError, URLError
from urllib.parse import quote as urlquote, urlencode, urlparse, parse_qs, urljoin

from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.galaxy.user_agent import user_agent
from ansible.module_utils.api import retry_with_delays_and_condition
from ansible.module_utils.api import generate_jittered_backoff
from ansible.module_utils.six import string_types
from ansible.module_utils.common.text.converters import to_bytes, to_native, to_text
from ansible.module_utils.urls import open_url, prepare_multipart
from ansible.utils.display import Display
from ansible.utils.hashing import secure_hash_s
from ansible.utils.path import makedirs_safe

display = Display()
_CACHE_LOCK = threading.Lock()
COLLECTION_PAGE_SIZE = 100
RETRY_HTTP_ERROR_CODES = {  # TODO: Allow user-configuration
    HTTPStatus.TOO_MANY_REQUESTS,
    520,  # Galaxy rate limit error code (Cloudflare unknown error)
    HTTPStatus.BAD_GATEWAY,  # Common error from galaxy that may represent any number of transient backend issues
}


def cache_lock(func):
    def wrapped(*args, **kwargs):
        with _CACHE_LOCK:
            return func(*args, **kwargs)

    return wrapped


def should_retry_error(exception):
    # Note: cloud.redhat.com masks rate limit errors with 403 (Forbidden) error codes.
    # Since 403 could reflect the actual problem (such as an expired token), we should
    # not retry by default.
    if isinstance(exception, GalaxyError) and exception.http_code in RETRY_HTTP_ERROR_CODES:
        return True

    if isinstance(exception, AnsibleError) and (cause := exception.__cause__):
        # URLError is often a proxy for an underlying error, handle wrapped exceptions
        if isinstance(cause, URLError):
            cause = cause.reason

        # Handle common URL related errors
        if isinstance(cause, (TimeoutError, BadStatusLine, IncompleteRead)):
            return True

    return False


def g_connect(versions):
    """
    Wrapper to lazily initialize connection info to Galaxy and verify the API versions required are available on the
    endpoint.

    :param versions: A list of API versions that the function supports.
    """
    def decorator(method):
        def wrapped(self, *args, **kwargs):
            if not self._available_api_versions:
                display.vvvv("Initial connection to galaxy_server: %s" % self.api_server)

                # Determine the type of Galaxy server we are talking to. First try it unauthenticated then with Bearer
                # auth for Automation Hub.
                n_url = self.api_server
                error_context_msg = 'Error when finding available api versions from %s (%s)' % (self.name, n_url)

                if self.api_server == 'https://galaxy.ansible.com' or self.api_server == 'https://galaxy.ansible.com/':
                    n_url = 'https://galaxy.ansible.com/api/'

                try:
                    data = self._call_galaxy(n_url, method='GET', error_context_msg=error_context_msg, cache=True)
                except (AnsibleError, GalaxyError, ValueError, KeyError) as err:
                    # Either the URL doesnt exist, or other error. Or the URL exists, but isn't a galaxy API
                    # root (not JSON, no 'available_versions') so try appending '/api/'
                    if n_url.endswith('/api') or n_url.endswith('/api/'):
                        raise

                    # Let exceptions here bubble up but raise the original if this returns a 404 (/api/ wasn't found).
                    n_url = _urljoin(n_url, '/api/')
                    try:
                        data = self._call_galaxy(n_url, method='GET', error_context_msg=error_context_msg, cache=True)
                    except GalaxyError as new_err:
                        if new_err.http_code == 404:
                            raise err
                        raise

                if 'available_versions' not in data:
                    raise AnsibleError("Tried to find galaxy API root at %s but no 'available_versions' are available "
                                       "on %s" % (n_url, self.api_server))

                # Update api_server to point to the "real" API root, which in this case could have been the configured
                # url + '/api/' appended.
                self.api_server = n_url

                # Default to only supporting v1, if only v1 is returned we also assume that v2 is available even though
                # it isn't returned in the available_versions dict.
                available_versions = data.get('available_versions', {u'v1': u'v1/'})
                if list(available_versions.keys()) == [u'v1']:
                    available_versions[u'v2'] = u'v2/'

                self._available_api_versions = available_versions
                display.vvvv("Found API version '%s' with Galaxy server %s (%s)"
                             % (', '.join(available_versions.keys()), self.name, self.api_server))

            # Verify that the API versions the function works with are available on the server specified.
            available_versions = set(self._available_api_versions.keys())
            common_versions = set(versions).intersection(available_versions)
            if not common_versions:
                raise AnsibleError("Galaxy action %s requires API versions '%s' but only '%s' are available on %s %s"
                                   % (method.__name__, ", ".join(versions), ", ".join(available_versions),
                                      self.name, self.api_server))

            # Warn only when we know we are talking to a collections API
            if common_versions == {'v2'}:
                display.deprecated(
                    'The v2 Ansible Galaxy API is deprecated and no longer supported. '
                    'Ensure that you have configured the ansible-galaxy CLI to utilize an '
                    'updated and supported version of Ansible Galaxy.',
                    version='2.20',
                )

            return method(self, *args, **kwargs)
        return wrapped
    return decorator


def get_cache_id(url):
    """ Gets the cache ID for the URL specified. """
    url_info = urlparse(url)

    port = None
    try:
        port = url_info.port
    except ValueError:
        pass  # While the URL is probably invalid, let the caller figure that out when using it

    # Cannot use netloc because it could contain credentials if the server specified had them in there.
    return '%s:%s' % (url_info.hostname, port or '')


@cache_lock
def _load_cache(b_cache_path):
    """ Loads the cache file requested if possible. The file must not be world writable. """
    cache_version = 1

    if not os.path.isfile(b_cache_path):
        display.vvvv("Creating Galaxy API response cache file at '%s'" % to_text(b_cache_path))
        with open(b_cache_path, 'w'):
            os.chmod(b_cache_path, 0o600)

    cache_mode = os.stat(b_cache_path).st_mode
    if cache_mode & stat.S_IWOTH:
        display.warning("Galaxy cache has world writable access (%s), ignoring it as a cache source."
                        % to_text(b_cache_path))
        return

    with open(b_cache_path, mode='rb') as fd:
        json_val = to_text(fd.read(), errors='surrogate_or_strict')

    try:
        cache = json.loads(json_val)
    except ValueError:
        cache = None

    if not isinstance(cache, dict) or cache.get('version', None) != cache_version:
        display.vvvv("Galaxy cache file at '%s' has an invalid version, clearing" % to_text(b_cache_path))
        cache = {'version': cache_version}

        # Set the cache after we've cleared the existing entries
        with open(b_cache_path, mode='wb') as fd:
            fd.write(to_bytes(json.dumps(cache), errors='surrogate_or_strict'))

    return cache


def _urljoin(*args):
    return '/'.join(to_native(a, errors='surrogate_or_strict').strip('/') for a in args + ('',) if a)


class GalaxyError(AnsibleError):
    """ Error for bad Galaxy server responses. """

    def __init__(self, http_error, message):
        super(GalaxyError, self).__init__(message)
        self.http_code = http_error.code
        self.url = http_error.geturl()

        try:
            http_msg = to_text(http_error.read())
            err_info = json.loads(http_msg)
        except (AttributeError, ValueError):
            err_info = {}

        url_split = self.url.split('/')
        if 'v2' in url_split:
            galaxy_msg = err_info.get('message', http_error.reason)
            code = err_info.get('code', 'Unknown')
            full_error_msg = u"%s (HTTP Code: %d, Message: %s Code: %s)" % (message, self.http_code, galaxy_msg, code)
        elif 'v3' in url_split:
            errors = err_info.get('errors', [])
            if not errors:
                errors = [{}]  # Defaults are set below, we just need to make sure 1 error is present.

            message_lines = []
            for error in errors:
                error_msg = error.get('detail') or error.get('title') or http_error.reason
                error_code = error.get('code') or 'Unknown'
                message_line = u"(HTTP Code: %d, Message: %s Code: %s)" % (self.http_code, error_msg, error_code)
                message_lines.append(message_line)

            full_error_msg = "%s %s" % (message, ', '.join(message_lines))
        else:
            # v1 and unknown API endpoints
            galaxy_msg = err_info.get('default', http_error.reason)
            full_error_msg = u"%s (HTTP Code: %d, Message: %s)" % (message, self.http_code, galaxy_msg)

        self.message = to_native(full_error_msg)


# Keep the raw string results for the date. It's too complex to parse as a datetime object and the various APIs return
# them in different formats.
CollectionMetadata = collections.namedtuple('CollectionMetadata', ['namespace', 'name', 'created_str', 'modified_str'])


class CollectionVersionMetadata:

    def __init__(self, namespace, name, version, download_url, artifact_sha256, dependencies, signatures_url, signatures):
        """
        Contains common information about a collection on a Galaxy server to smooth through API differences for
        Collection and define a standard meta info for a collection.

        :param namespace: The namespace name.
        :param name: The collection name.
        :param version: The version that the metadata refers to.
        :param download_url: The URL to download the collection.
        :param artifact_sha256: The SHA256 of the collection artifact for later verification.
        :param dependencies: A dict of dependencies of the collection.
        :param signatures_url: The URL to the specific version of the collection.
        :param signatures: The list of signatures found at the signatures_url.
        """
        self.namespace = namespace
        self.name = name
        self.version = version
        self.download_url = download_url
        self.artifact_sha256 = artifact_sha256
        self.dependencies = dependencies
        self.signatures_url = signatures_url
        self.signatures = signatures


@functools.total_ordering
class GalaxyAPI:
    """ This class is meant to be used as a API client for an Ansible Galaxy server """

    def __init__(
            self, galaxy, name, url,
            username=None, password=None, token=None, validate_certs=True,
            available_api_versions=None,
            clear_response_cache=False, no_cache=True,
            priority=float('inf'),
            timeout=60,
    ):
        self.galaxy = galaxy
        self.name = name
        self.username = username
        self.password = password
        self.token = token
        self.api_server = url
        self.validate_certs = validate_certs
        self.timeout = timeout
        self._available_api_versions = available_api_versions or {}
        self._priority = priority
        self._server_timeout = timeout

        b_cache_dir = to_bytes(C.GALAXY_CACHE_DIR, errors='surrogate_or_strict')
        makedirs_safe(b_cache_dir, mode=0o700)
        self._b_cache_path = os.path.join(b_cache_dir, b'api.json')

        if clear_response_cache:
            with _CACHE_LOCK:
                if os.path.exists(self._b_cache_path):
                    display.vvvv("Clearing cache file (%s)" % to_text(self._b_cache_path))
                    os.remove(self._b_cache_path)

        self._cache = None
        if not no_cache:
            self._cache = _load_cache(self._b_cache_path)

        display.debug('Validate TLS certificates for %s: %s' % (self.api_server, self.validate_certs))

    def __str__(self):
        # type: (GalaxyAPI) -> str
        """Render GalaxyAPI as a native string representation."""
        return to_native(self.name)

    def __unicode__(self):
        # type: (GalaxyAPI) -> str
        """Render GalaxyAPI as a unicode/text string representation."""
        return to_text(self.name)

    def __repr__(self):
        # type: (GalaxyAPI) -> str
        """Render GalaxyAPI as an inspectable string representation."""
        return (
            '<{instance!s} "{name!s}" @ {url!s} with priority {priority!s}>'.
            format(
                instance=self, name=self.name,
                priority=self._priority, url=self.api_server,
            )
        )

    def __lt__(self, other_galaxy_api):
        # type: (GalaxyAPI, GalaxyAPI) -> bool
        """Return whether the instance priority is higher than other."""
        if not isinstance(other_galaxy_api, self.__class__):
            return NotImplemented

        return self._priority > other_galaxy_api._priority

    @property  # type: ignore[misc]  # https://github.com/python/mypy/issues/1362
    @g_connect(['v1', 'v2', 'v3'])
    def available_api_versions(self):
        # Calling g_connect will populate self._available_api_versions
        return self._available_api_versions

    @retry_with_delays_and_condition(
        backoff_iterator=generate_jittered_backoff(retries=6, delay_base=2, delay_threshold=40),
        should_retry_error=should_retry_error
    )
    def _call_galaxy(self, url, args=None, headers=None, method=None, auth_required=False, error_context_msg=None,
                     cache=False, cache_key=None):
        url_info = urlparse(url)
        cache_id = get_cache_id(url)
        if not cache_key:
            cache_key = url_info.path
        query = parse_qs(url_info.query)
        if cache and self._cache:
            server_cache = self._cache.setdefault(cache_id, {})
            iso_datetime_format = '%Y-%m-%dT%H:%M:%SZ'

            valid = False
            if cache_key in server_cache:
                expires = datetime.datetime.strptime(server_cache[cache_key]['expires'], iso_datetime_format)
                expires = expires.replace(tzinfo=datetime.timezone.utc)
                valid = datetime.datetime.now(datetime.timezone.utc) < expires

            is_paginated_url = 'page' in query or 'offset' in query
            if valid and not is_paginated_url:
                # Got a hit on the cache and we aren't getting a paginated response
                path_cache = server_cache[cache_key]
                if path_cache.get('paginated'):
                    if '/v3/' in cache_key:
                        res = {'links': {'next': None}}
                    else:
                        res = {'next': None}

                    # Technically some v3 paginated APIs return in 'data' but the caller checks the keys for this so
                    # always returning the cache under results is fine.
                    res['results'] = []
                    for result in path_cache['results']:
                        res['results'].append(result)

                else:
                    res = path_cache['results']

                return res

            elif not is_paginated_url:
                # The cache entry had expired or does not exist, start a new blank entry to be filled later.
                expires = datetime.datetime.now(datetime.timezone.utc)
                expires += datetime.timedelta(days=1)
                server_cache[cache_key] = {
                    'expires': expires.strftime(iso_datetime_format),
                    'paginated': False,
                }

        headers = headers or {}
        self._add_auth_token(headers, url, required=auth_required)

        try:
            display.vvvv("Calling Galaxy at %s" % url)
            resp = open_url(to_native(url), data=args, validate_certs=self.validate_certs, headers=headers,
                            method=method, timeout=self._server_timeout, http_agent=user_agent(), follow_redirects='safe')
        except HTTPError as e:
            raise GalaxyError(e, error_context_msg)
        except Exception as ex:
            raise AnsibleError(f"Unknown error when attempting to call Galaxy at {url!r}.") from ex

        resp_data = to_text(resp.read(), errors='surrogate_or_strict')
        try:
            data = json.loads(resp_data)
        except ValueError:
            raise AnsibleError("Failed to parse Galaxy response from '%s' as JSON:\n%s"
                               % (resp.url, to_native(resp_data)))

        if cache and self._cache:
            path_cache = self._cache[cache_id][cache_key]

            # v3 can return data or results for paginated results. Scan the result so we can determine what to cache.
            paginated_key = None
            for key in ['data', 'results']:
                if key in data:
                    paginated_key = key
                    break

            if paginated_key:
                path_cache['paginated'] = True
                results = path_cache.setdefault('results', [])
                for result in data[paginated_key]:
                    results.append(result)

            else:
                path_cache['results'] = data

        return data

    def _add_auth_token(self, headers, url, token_type=None, required=False):
        # Don't add the auth token if one is already present
        if 'Authorization' in headers:
            return

        if not self.token and required:
            raise AnsibleError("No access token or username set. A token can be set with --api-key "
                               "or at {0}.".format(to_native(C.GALAXY_TOKEN_PATH)))

        if self.token:
            headers.update(self.token.headers())

    @cache_lock
    def _set_cache(self):
        with open(self._b_cache_path, mode='wb') as fd:
            fd.write(to_bytes(json.dumps(self._cache), errors='surrogate_or_strict'))

    @g_connect(['v1'])
    def authenticate(self, github_token):
        """
        Retrieve an authentication token
        """
        url = _urljoin(self.api_server, self.available_api_versions['v1'], "tokens") + '/'
        args = urlencode({"github_token": github_token})

        try:
            resp = open_url(url, data=args, validate_certs=self.validate_certs, method="POST", http_agent=user_agent(), timeout=self._server_timeout)
        except HTTPError as e:
            raise GalaxyError(e, 'Attempting to authenticate to galaxy')
        except Exception as ex:
            raise AnsibleError('Unable to authenticate to galaxy.') from ex

        data = json.loads(to_text(resp.read(), errors='surrogate_or_strict'))
        return data

    @g_connect(['v1'])
    def create_import_task(self, github_user, github_repo, reference=None, role_name=None):
        """
        Post an import request
        """
        url = _urljoin(self.api_server, self.available_api_versions['v1'], "imports") + '/'
        args = {
            "github_user": github_user,
            "github_repo": github_repo,
            "github_reference": reference if reference else ""
        }
        if role_name:
            args['alternate_role_name'] = role_name
        data = self._call_galaxy(url, args=urlencode(args), method="POST")
        if data.get('results', None):
            return data['results']
        return data

    @g_connect(['v1'])
    def get_import_task(self, task_id=None, github_user=None, github_repo=None):
        """
        Check the status of an import task.
        """
        url = _urljoin(self.api_server, self.available_api_versions['v1'], "imports")
        if task_id is not None:
            url = "%s?id=%d" % (url, task_id)
        elif github_user is not None and github_repo is not None:
            url = "%s?github_user=%s&github_repo=%s" % (url, github_user, github_repo)
        else:
            raise AnsibleError("Expected task_id or github_user and github_repo")

        data = self._call_galaxy(url)
        return data['results']

    @g_connect(['v1'])
    def lookup_role_by_name(self, role_name, notify=True):
        """
        Find a role by name.
        """
        role_name = to_text(urlquote(to_bytes(role_name)))

        try:
            parts = role_name.split(".")
            user_name = ".".join(parts[0:-1])
            role_name = parts[-1]
            if notify:
                display.display("- downloading role '%s', owned by %s" % (role_name, user_name))
        except Exception:
            raise AnsibleError("Invalid role name (%s). Specify role as format: username.rolename" % role_name)

        url = _urljoin(self.api_server, self.available_api_versions['v1'], "roles",
                       "?owner__username=%s&name=%s" % (user_name, role_name))
        data = self._call_galaxy(url)
        if len(data["results"]) != 0:
            return data["results"][0]
        return None

    @g_connect(['v1'])
    def fetch_role_related(self, related, role_id):
        """
        Fetch the list of related items for the given role.
        The url comes from the 'related' field of the role.
        """

        results = []
        try:
            url = _urljoin(self.api_server, self.available_api_versions['v1'], "roles", role_id, related,
                           "?page_size=50")
            data = self._call_galaxy(url)
            results = data['results']
            done = (data.get('next_link', None) is None)

            # https://github.com/ansible/ansible/issues/64355
            # api_server contains part of the API path but next_link includes the /api part so strip it out.
            url_info = urlparse(self.api_server)
            base_url = "%s://%s/" % (url_info.scheme, url_info.netloc)

            while not done:
                url = _urljoin(base_url, data['next_link'])
                data = self._call_galaxy(url)
                results += data['results']
                done = (data.get('next_link', None) is None)
        except Exception as e:
            display.warning("Unable to retrieve role (id=%s) data (%s), but this is not fatal so we continue: %s"
                            % (role_id, related, to_text(e)))
        return results

    @g_connect(['v1'])
    def get_list(self, what):
        """
        Fetch the list of items specified.
        """
        try:
            url = _urljoin(self.api_server, self.available_api_versions['v1'], what, "?page_size")
            data = self._call_galaxy(url)
            if "results" in data:
                results = data['results']
            else:
                results = data
            done = True
            if "next" in data:
                done = (data.get('next_link', None) is None)
            while not done:
                url = _urljoin(self.api_server, data['next_link'])
                data = self._call_galaxy(url)
                results += data['results']
                done = (data.get('next_link', None) is None)
            return results
        except Exception as error:
            raise AnsibleError("Failed to download the %s list: %s" % (what, to_native(error)))

    @g_connect(['v1'])
    def search_roles(self, search, **kwargs):

        search_url = _urljoin(self.api_server, self.available_api_versions['v1'], "search", "roles", "?")

        if search:
            search_url += '&autocomplete=' + to_text(urlquote(to_bytes(search)))

        tags = kwargs.get('tags', None)
        platforms = kwargs.get('platforms', None)
        page_size = kwargs.get('page_size', None)
        author = kwargs.get('author', None)

        if tags and isinstance(tags, string_types):
            tags = tags.split(',')
            search_url += '&tags_autocomplete=' + '+'.join(tags)

        if platforms and isinstance(platforms, string_types):
            platforms = platforms.split(',')
            search_url += '&platforms_autocomplete=' + '+'.join(platforms)

        if page_size:
            search_url += '&page_size=%s' % page_size

        if author:
            search_url += '&username_autocomplete=%s' % author

        data = self._call_galaxy(search_url)
        return data

    @g_connect(['v1'])
    def add_secret(self, source, github_user, github_repo, secret):
        url = _urljoin(self.api_server, self.available_api_versions['v1'], "notification_secrets") + '/'
        args = urlencode({
            "source": source,
            "github_user": github_user,
            "github_repo": github_repo,
            "secret": secret
        })
        data = self._call_galaxy(url, args=args, method="POST")
        return data

    @g_connect(['v1'])
    def list_secrets(self):
        url = _urljoin(self.api_server, self.available_api_versions['v1'], "notification_secrets")
        data = self._call_galaxy(url, auth_required=True)
        return data

    @g_connect(['v1'])
    def remove_secret(self, secret_id):
        url = _urljoin(self.api_server, self.available_api_versions['v1'], "notification_secrets", secret_id) + '/'
        data = self._call_galaxy(url, auth_required=True, method='DELETE')
        return data

    @g_connect(['v1'])
    def delete_role(self, github_user, github_repo):
        url = _urljoin(self.api_server, self.available_api_versions['v1'], "removerole",
                       "?github_user=%s&github_repo=%s" % (github_user, github_repo))
        data = self._call_galaxy(url, auth_required=True, method='DELETE')
        return data

    # Collection APIs #

    @g_connect(['v2', 'v3'])
    def publish_collection(self, collection_path):
        """
        Publishes a collection to a Galaxy server and returns the import task URI.

        :param collection_path: The path to the collection tarball to publish.
        :return: The import task URI that contains the import results.
        """
        display.display("Publishing collection artifact '%s' to %s %s" % (collection_path, self.name, self.api_server))

        b_collection_path = to_bytes(collection_path, errors='surrogate_or_strict')
        if not os.path.exists(b_collection_path):
            raise AnsibleError("The collection path specified '%s' does not exist." % to_native(collection_path))
        elif not tarfile.is_tarfile(b_collection_path):
            raise AnsibleError("The collection path specified '%s' is not a tarball, use 'ansible-galaxy collection "
                               "build' to create a proper release artifact." % to_native(collection_path))

        with open(b_collection_path, 'rb') as collection_tar:
            sha256 = secure_hash_s(collection_tar.read(), hash_func=hashlib.sha256)

        content_type, b_form_data = prepare_multipart(
            {
                'sha256': sha256,
                'file': {
                    'filename': b_collection_path,
                    'mime_type': 'application/octet-stream',
                },
            }
        )

        headers = {
            'Content-type': content_type,
            'Content-length': len(b_form_data),
        }

        if 'v3' in self.available_api_versions:
            n_url = _urljoin(self.api_server, self.available_api_versions['v3'], 'artifacts', 'collections') + '/'
        else:
            n_url = _urljoin(self.api_server, self.available_api_versions['v2'], 'collections') + '/'

        resp = self._call_galaxy(n_url, args=b_form_data, headers=headers, method='POST', auth_required=True,
                                 error_context_msg='Error when publishing collection to %s (%s)'
                                                   % (self.name, self.api_server))

        return resp['task']

    @g_connect(['v2', 'v3'])
    def wait_import_task(self, task_id, timeout=0):
        """
        Waits until the import process on the Galaxy server has completed or the timeout is reached.

        :param task_id: The id of the import task to wait for. This can be parsed out of the return
            value for GalaxyAPI.publish_collection.
        :param timeout: The timeout in seconds, 0 is no timeout.
        """
        state = 'waiting'
        data = None

        # Construct the appropriate URL per version
        if 'v3' in self.available_api_versions:
            full_url = _urljoin(self.api_server, self.available_api_versions['v3'],
                                'imports/collections', task_id, '/')
        else:
            full_url = _urljoin(self.api_server, self.available_api_versions['v2'],
                                'collection-imports', task_id, '/')

        display.display("Waiting until Galaxy import task %s has completed" % full_url)
        start = time.time()
        wait = C.GALAXY_COLLECTION_IMPORT_POLL_INTERVAL

        while timeout == 0 or (time.time() - start) < timeout:
            try:
                data = self._call_galaxy(full_url, method='GET', auth_required=True,
                                         error_context_msg='Error when getting import task results at %s' % full_url)
            except GalaxyError as e:
                if e.http_code != 404:
                    raise
                # The import job may not have started, and as such, the task url may not yet exist
                display.vvv('Galaxy import process has not started, wait %s seconds before trying again' % wait)
                time.sleep(wait)
                continue

            state = data.get('state', 'waiting')

            if data.get('finished_at', None):
                break

            display.vvv('Galaxy import process has a status of %s, wait %d seconds before trying again'
                        % (state, wait))
            time.sleep(wait)

            # poor man's exponential backoff algo so we don't flood the Galaxy API, cap at 30 seconds.
            wait = min(30, wait * C.GALAXY_COLLECTION_IMPORT_POLL_FACTOR)
        if state == 'waiting':
            raise AnsibleError("Timeout while waiting for the Galaxy import process to finish, check progress at '%s'"
                               % to_native(full_url))

        for message in data.get('messages', []):
            level = message['level']
            if level.lower() == 'error':
                display.error("Galaxy import error message: %s" % message['message'])
            elif level.lower() == 'warning':
                display.warning("Galaxy import warning message: %s" % message['message'])
            else:
                display.vvv("Galaxy import message: %s - %s" % (level, message['message']))

        if state == 'failed':
            code = to_native(data['error'].get('code', 'UNKNOWN'))
            description = to_native(
                data['error'].get('description', "Unknown error, see %s for more details" % full_url))
            raise AnsibleError("Galaxy import process failed: %s (Code: %s)" % (description, code))

    @g_connect(['v2', 'v3'])
    def get_collection_metadata(self, namespace, name):
        """
        Gets the collection information from the Galaxy server about a specific Collection.

        :param namespace: The collection namespace.
        :param name: The collection name.
        return: CollectionMetadata about the collection.
        """
        if 'v3' in self.available_api_versions:
            api_path = self.available_api_versions['v3']
            field_map = [
                ('created_str', 'created_at'),
                ('modified_str', 'updated_at'),
            ]
        else:
            api_path = self.available_api_versions['v2']
            field_map = [
                ('created_str', 'created'),
                ('modified_str', 'modified'),
            ]

        info_url = _urljoin(self.api_server, api_path, 'collections', namespace, name, '/')
        error_context_msg = 'Error when getting the collection info for %s.%s from %s (%s)' \
                            % (namespace, name, self.name, self.api_server)
        data = self._call_galaxy(info_url, error_context_msg=error_context_msg)

        metadata = {}
        for name, api_field in field_map:
            metadata[name] = data.get(api_field, None)

        return CollectionMetadata(namespace, name, **metadata)

    @g_connect(['v2', 'v3'])
    def get_collection_version_metadata(self, namespace, name, version):
        """
        Gets the collection information from the Galaxy server about a specific Collection version.

        :param namespace: The collection namespace.
        :param name: The collection name.
        :param version: Version of the collection to get the information for.
        :return: CollectionVersionMetadata about the collection at the version requested.
        """
        api_path = self.available_api_versions.get('v3', self.available_api_versions.get('v2'))
        url_paths = [self.api_server, api_path, 'collections', namespace, name, 'versions', version, '/']

        n_collection_url = _urljoin(*url_paths)
        error_context_msg = 'Error when getting collection version metadata for %s.%s:%s from %s (%s)' \
                            % (namespace, name, version, self.name, self.api_server)
        data = self._call_galaxy(n_collection_url, error_context_msg=error_context_msg, cache=True)
        self._set_cache()

        signatures = data.get('signatures') or []

        download_url_info = urlparse(data['download_url'])
        if not download_url_info.scheme and not download_url_info.path.startswith('/'):
            # galaxy does a lot of redirects, with much more complex pathing than we use
            # within this codebase, without updating _call_galaxy to be able to return
            # the final URL, we can't reliably build a relative URL.
            raise AnsibleError(f'Invalid non absolute download_url: {data["download_url"]}')

        download_url = urljoin(self.api_server, data['download_url'])

        return CollectionVersionMetadata(data['namespace']['name'], data['collection']['name'], data['version'],
                                         download_url, data['artifact']['sha256'],
                                         data['metadata']['dependencies'], data['href'], signatures)

    @g_connect(['v2', 'v3'])
    def get_collection_versions(self, namespace, name):
        """
        Gets a list of available versions for a collection on a Galaxy server.

        :param namespace: The collection namespace.
        :param name: The collection name.
        :return: A list of versions that are available.
        """
        relative_link = False
        if 'v3' in self.available_api_versions:
            api_path = self.available_api_versions['v3']
            pagination_path = ['links', 'next']
            relative_link = True  # AH pagination results are relative an not an absolute URI.
        else:
            api_path = self.available_api_versions['v2']
            pagination_path = ['next']

        page_size_name = 'limit' if 'v3' in self.available_api_versions else 'page_size'
        versions_url = _urljoin(self.api_server, api_path, 'collections', namespace, name, 'versions', '/?%s=%d' % (page_size_name, COLLECTION_PAGE_SIZE))
        versions_url_info = urlparse(versions_url)
        cache_key = versions_url_info.path

        # We should only rely on the cache if the collection has not changed. This may slow things down but it ensures
        # we are not waiting a day before finding any new collections that have been published.
        if self._cache:
            server_cache = self._cache.setdefault(get_cache_id(versions_url), {})
            modified_cache = server_cache.setdefault('modified', {})

            try:
                modified_date = self.get_collection_metadata(namespace, name).modified_str
            except GalaxyError as err:
                if err.http_code != 404:
                    raise
                # No collection found, return an empty list to keep things consistent with the various APIs
                return []

            cached_modified_date = modified_cache.get('%s.%s' % (namespace, name), None)
            if cached_modified_date != modified_date:
                modified_cache['%s.%s' % (namespace, name)] = modified_date
                if versions_url_info.path in server_cache:
                    del server_cache[cache_key]

                self._set_cache()

        error_context_msg = 'Error when getting available collection versions for %s.%s from %s (%s)' \
                            % (namespace, name, self.name, self.api_server)

        try:
            data = self._call_galaxy(versions_url, error_context_msg=error_context_msg, cache=True, cache_key=cache_key)
        except GalaxyError as err:
            if err.http_code != 404:
                raise
            # v3 doesn't raise a 404 so we need to mimick the empty response from APIs that do.
            return []

        if 'data' in data:
            # v3 automation-hub is the only known API that uses `data`
            # since v3 pulp_ansible does not, we cannot rely on version
            # to indicate which key to use
            results_key = 'data'
        else:
            results_key = 'results'

        versions = []
        while True:
            versions += [v['version'] for v in data[results_key]]

            next_link = data
            for path in pagination_path:
                next_link = next_link.get(path, {})

            if not next_link:
                break
            elif relative_link:
                next_link_info = urlparse(next_link)
                if not next_link_info.scheme and not next_link_info.path.startswith('/'):
                    raise AnsibleError(f'Invalid non absolute pagination link: {next_link}')
                next_link = urljoin(self.api_server, next_link)

            data = self._call_galaxy(to_native(next_link, errors='surrogate_or_strict'),
                                     error_context_msg=error_context_msg, cache=True, cache_key=cache_key)
        self._set_cache()

        return versions

    @g_connect(['v2', 'v3'])
    def get_collection_signatures(self, namespace, name, version):
        """
        Gets the collection signatures from the Galaxy server about a specific Collection version.

        :param namespace: The collection namespace.
        :param name: The collection name.
        :param version: Version of the collection to get the information for.
        :return: A list of signature strings.
        """
        api_path = self.available_api_versions.get('v3', self.available_api_versions.get('v2'))
        url_paths = [self.api_server, api_path, 'collections', namespace, name, 'versions', version, '/']

        n_collection_url = _urljoin(*url_paths)
        error_context_msg = 'Error when getting collection version metadata for %s.%s:%s from %s (%s)' \
                            % (namespace, name, version, self.name, self.api_server)
        data = self._call_galaxy(n_collection_url, error_context_msg=error_context_msg, cache=True)
        self._set_cache()

        signatures = [signature_info["signature"] for signature_info in data.get("signatures") or []]
        if not signatures:
            display.vvvv(f"Server {self.api_server} has not signed {namespace}.{name}:{version}")
        return signatures