view env/lib/python3.9/site-packages/cwltool/resolver.py @ 0:4f3585e2f14b draft default tip

"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"

"""Resolves references to CWL documents from local or remote places."""

import os
import urllib
from pathlib import Path
from typing import Optional

from schema_salad.ref_resolver import Loader

from .loghandler import _logger


def resolve_local(document_loader: Optional[Loader], uri: str) -> Optional[str]:
    pathpart, frag = urllib.parse.urldefrag(uri)

    try:
        pathobj = Path(pathpart).resolve()
    except OSError:
        _logger.debug("local resolver could not resolve %s", uri)
        return None

    if pathobj.is_file():
        if frag:
            return f"{pathobj.as_uri()}#{frag}"
        return pathobj.as_uri()

    sharepaths = [
        os.environ.get(
            "XDG_DATA_HOME", os.path.join(os.path.expanduser("~"), ".local", "share")
        )
    ]
    sharepaths.extend(
        os.environ.get("XDG_DATA_DIRS", "/usr/local/share/:/usr/share/").split(":")
    )
    shares = [os.path.join(s, "commonwl", uri) for s in sharepaths]

    _logger.debug("Search path is %s", shares)

    for path in shares:
        if os.path.exists(path):
            return Path(uri).as_uri()
        if os.path.exists(f"{path}.cwl"):
            return Path(f"{path}.cwl").as_uri()
    return None


def tool_resolver(document_loader: Loader, uri: str) -> Optional[str]:
    for r in [resolve_local, resolve_ga4gh_tool]:
        ret = r(document_loader, uri)
        if ret is not None:
            return ret
    return None


ga4gh_tool_registries = ["https://dockstore.org/api"]
# in the TRS registry, a primary descriptor can be reached at {0}/api/ga4gh/v2/tools/{1}/versions/{2}/plain-CWL/descriptor
# The primary descriptor is a CommandLineTool in the case that the files endpoint only describes one file
# When the primary descriptor is a Workflow, files need to be imported without stripping off "descriptor", looking at the files endpoint is a workaround
# tested with TRS version 2.0.0-beta.2
# TODO not stripping off "descriptor" when looking for local imports would also work https://github.com/ga4gh/tool-registry-service-schemas/blob/2.0.0-beta.2/src/main/resources/swagger/ga4gh-tool-discovery.yaml#L273
GA4GH_TRS_FILES = "{0}/api/ga4gh/v2/tools/{1}/versions/{2}/CWL/files"
GA4GH_TRS_PRIMARY_DESCRIPTOR = (
    "{0}/api/ga4gh/v2/tools/{1}/versions/{2}/plain-CWL/descriptor/{3}"
)


def resolve_ga4gh_tool(document_loader: Loader, uri: str) -> Optional[str]:
    path, version = uri.partition(":")[::2]
    if not version:
        version = "latest"
    for reg in ga4gh_tool_registries:
        ds = GA4GH_TRS_FILES.format(
            reg, urllib.parse.quote(path, ""), urllib.parse.quote(version, "")
        )
        try:
            _logger.debug("Head path is %s", ds)
            resp = document_loader.session.head(ds)
            resp.raise_for_status()

            _logger.debug("Passed head path of %s", ds)

            resp = document_loader.session.get(ds)
            for file_listing in resp.json():
                if file_listing.get("file_type") == "PRIMARY_DESCRIPTOR":
                    primary_path = file_listing.get("path")
                    ds2 = GA4GH_TRS_PRIMARY_DESCRIPTOR.format(
                        reg,
                        urllib.parse.quote(path, ""),
                        urllib.parse.quote(version, ""),
                        urllib.parse.quote(primary_path, ""),
                    )
                    _logger.debug("Resolved %s", ds2)
                    return ds2
        except Exception:  # nosec
            pass
    return None