Add conda support

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

src/packageurl/contrib/purl2url.py

@@ -527,6 +527,50 @@ def build_luarocks_download_url(purl):
         return f"https://luarocks.org/{name}-{version}.src.rock"
 
 
+@download_router.route("pkg:conda/.*")
+def build_conda_download_url(purl):
+    """
+    Resolve a Conda PURL to a real downloadable URL
+
+    Supported qualifiers:
+      - channel: e.g., main, conda-forge (required for deterministic base)
+      - subdir: e.g., linux-64, osx-arm64, win-64, noarch
+      - build:  exact build string (optional but recommended)
+      - type:   'conda' or 'tar.bz2' (preference; fallback to whichever exists)
+    """
+    p = PackageURL.from_string(purl)
+    if not p.name or not p.version:
+        return None
+
+    q = p.qualifiers or {}
+    name = p.name
+    version = p.version
+    build = q.get("build")
+    channel = q.get("channel") or "main"
+    subdir = q.get("subdir") or "noarch"
+    req_type = q.get("type")
+
+    def _conda_base_for_channel(channel: str) -> str:
+        """
+        Map a conda channel to its base URL.
+        - 'main' / 'defaults' -> repo.anaconda.com
+        - any other channel    -> conda.anaconda.org/<channel>
+        """
+        ch = (channel or "").lower()
+        if ch in ("main", "defaults"):
+            return "https://repo.anaconda.com/pkgs/main"
+        return f"https://conda.anaconda.org/{ch}"
+
+    base = _conda_base_for_channel(channel)
+
+    package_identifier = (
+        f"{name}-{version}-{build}.{req_type}" if build else f"{name}-{version}.{req_type}"
+    )
+
+    download_url = f"{base}/{subdir}/{package_identifier}"
+    return download_url
+
+
 def get_repo_download_url(purl):
     """
     Return ``download_url`` if present in ``purl`` qualifiers or

tests/contrib/test_purl2url.py

@@ -107,6 +107,7 @@ def test_purl2url_get_download_url():
         "pkg:swift/github.com/RxSwiftCommunity/RxFlow@2.12.4": "https://github.com/RxSwiftCommunity/RxFlow/archive/2.12.4.zip",
         "pkg:luarocks/luasocket@3.1.0-1": "https://luarocks.org/luasocket-3.1.0-1.src.rock",
         "pkg:luarocks/hisham/luafilesystem@1.8.0-1": "https://luarocks.org/luafilesystem-1.8.0-1.src.rock",
+        "pkg:conda/absl-py@0.4.1?build=py36h06a4308_0&channel=main&subdir=linux-64&type=tar.bz2": "https://repo.anaconda.com/pkgs/main/linux-64/absl-py-0.4.1-py36h06a4308_0.tar.bz2",
         # From `download_url` qualifier
         "pkg:github/yarnpkg/yarn@1.3.2?download_url=https://github.com/yarnpkg/yarn/releases/download/v1.3.2/yarn-v1.3.2.tar.gz&version_prefix=v": "https://github.com/yarnpkg/yarn/releases/download/v1.3.2/yarn-v1.3.2.tar.gz",
         "pkg:generic/lxc-master.tar.gz?download_url=https://salsa.debian.org/lxc-team/lxc/-/archive/master/lxc-master.tar.gz": "https://salsa.debian.org/lxc-team/lxc/-/archive/master/lxc-master.tar.gz",