refactor: introduce new internal representation for Opossum files

src/opossum_lib/opossum_model.py

@@ -0,0 +1,302 @@
+# SPDX-FileCopyrightText: TNG Technology Consulting GmbH <https://www.tngtech.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+from __future__ import annotations
+
+import uuid
+from collections import defaultdict
+from collections.abc import Iterable
+from copy import deepcopy
+from dataclasses import field
+from enum import Enum, auto
+from pathlib import PurePath
+from typing import Literal
+
+from pydantic import BaseModel, ConfigDict
+
+import opossum_lib.opossum.opossum_file as opossum_file
+from opossum_lib.opossum.opossum_file_content import OpossumFileContent
+from opossum_lib.opossum.output_model import OpossumOutputFile
+
+type OpossumPackageIdentifier = str
+type ResourcePath = str
+
+
+def _convert_path_to_str(path: PurePath) -> str:
+    return str(path).replace("\\", "/")
+
+
+def default_attribution_id_mapper() -> dict[OpossumPackage, str]:
+    return defaultdict(lambda: str(uuid.uuid4()))
+
+
+class Opossum(BaseModel):
+    model_config = ConfigDict(frozen=True, extra="forbid")
+    metadata: Metadata
+    resources: list[Resource]
+    attribution_breakpoints: list[str] = []
+    external_attribution_sources: dict[str, ExternalAttributionSource] = {}
+    frequent_licenses: list[FrequentLicense] | None = None
+    files_with_children: list[str] | None = None
+    base_urls_for_sources: BaseUrlsForSources | None = None
+    attribution_to_id: dict[OpossumPackage, str] = field(
+        default_factory=default_attribution_id_mapper
+    )
+    output_file: OpossumOutputFile | None = None
+
+    def to_opossum_file_format(self) -> OpossumFileContent:
+        external_attributions, resources_to_attributions = (
+            self.create_attribution_mapping(self.resources)
+        )
+        frequent_licenses = None
+        if self.frequent_licenses:
+            frequent_licenses = [
+                license.to_opossum_file_format() for license in self.frequent_licenses
+            ]
+        base_urls_for_sources = (
+            self.base_urls_for_sources
+            and self.base_urls_for_sources.to_opossum_file_format()
+        )
+
+        external_attribution_sources = {
+            key: val.to_opossum_file_format()
+            for (key, val) in self.external_attribution_sources.items()
+        }
+
+        return OpossumFileContent(
+            input_file=opossum_file.OpossumInformation(
+                metadata=self.metadata.to_opossum_file_format(),
+                resources={
+                    str(resource.path): resource.to_opossum_file_format()
+                    for resource in self.resources
+                },
+                external_attributions=external_attributions,
+                resources_to_attributions=resources_to_attributions,
+                attribution_breakpoints=deepcopy(self.attribution_breakpoints),
+                external_attribution_sources=external_attribution_sources,
+                frequent_licenses=frequent_licenses,
+                files_with_children=deepcopy(self.files_with_children),
+                base_urls_for_sources=base_urls_for_sources,
+            ),
+            output_file=self.output_file,
+        )
+
+    def create_attribution_mapping(
+        self,
+        root_nodes: list[Resource],
+    ) -> tuple[
+        dict[opossum_file.OpossumPackageIdentifier, opossum_file.OpossumPackage],
+        dict[opossum_file.ResourcePath, list[opossum_file.OpossumPackageIdentifier]],
+    ]:
+        external_attributions: dict[
+            opossum_file.OpossumPackageIdentifier, opossum_file.OpossumPackage
+        ] = {}
+        resources_to_attributions: dict[
+            opossum_file.ResourcePath, list[opossum_file.OpossumPackageIdentifier]
+        ] = {}
+
+        def process_node(node: Resource) -> None:
+            path = _convert_path_to_str(node.path)
+            if not path.startswith("/"):
+                # the / is required by OpossumUI
+                path = "/" + path
+
+            node_attributions_by_id = {
+                self.get_attribution_key(a): a.to_opossum_file_format()
+                for a in node.attributions
+            }
+            external_attributions.update(node_attributions_by_id)
+
+            if len(node_attributions_by_id) > 0:
+                resources_to_attributions[path] = list(node_attributions_by_id.keys())
+
+            for child in node.children.values():
+                process_node(child)
+
+        for root in root_nodes:
+            process_node(root)
+
+        return external_attributions, resources_to_attributions
+
+    def get_attribution_key(
+        self, attribution: OpossumPackage
+    ) -> OpossumPackageIdentifier:
+        id = self.attribution_to_id[attribution]
+        self.attribution_to_id[attribution] = id
+        return id
+
+
+class ResourceType(Enum):
+    FILE = auto()
+    FOLDER = auto()
+
+
+class Resource(BaseModel):
+    model_config = ConfigDict(frozen=False, extra="forbid")
+    path: PurePath
+    type: ResourceType | None = None
+    attributions: list[OpossumPackage] = []
+    children: dict[str, Resource] = {}
+
+    def to_opossum_file_format(self) -> opossum_file.ResourceInFile:
+        if self.children or self.type == ResourceType.FOLDER:
+            return {
+                _convert_path_to_str(
+                    child.path.relative_to(self.path)
+                ): child.to_opossum_file_format()
+                for child in self.children.values()
+            }
+        else:
+            return 1
+
+    def add_resource(self, resource: Resource) -> None:
+        if not resource.path.is_relative_to(self.path):
+            raise RuntimeError(
+                f"The path {resource.path} is not a child of this node at {self.path}."
+            )
+        remaining_path_parts = resource.path.relative_to(self.path).parts
+        if remaining_path_parts:
+            self._add_resource(resource, remaining_path_parts)
+        else:
+            self._update(resource)
+
+    def _add_resource(
+        self, resource: Resource, remaining_path_parts: Iterable[str]
+    ) -> None:
+        if not remaining_path_parts:
+            self._update(resource)
+            return
+        next, *rest_parts = remaining_path_parts
+        if next not in self.children:
+            self.children[next] = Resource(path=self.path / next)
+        self.children[next]._add_resource(resource, rest_parts)
+
+    def _update(self, other: Resource) -> None:
+        if self.path != other.path:
+            raise RuntimeError(
+                "Trying to merge nodes with different paths: "
+                + f"{self.path} vs. {other.path}"
+            )
+        if self.type and other.type and self.type != other.type:
+            raise RuntimeError(
+                "Trying to merge incompatible node types. "
+                + f"Current node is {self.type}. Other is {other.type}"
+            )
+        self.type = self.type or other.type
+        self.attributions.extend(other.attributions)
+        for key, child in other.children.items():
+            if key in self.children:
+                self.children[key]._update(child)
+            else:
+                self.children[key] = child
+
+
+class BaseUrlsForSources(BaseModel):
+    model_config = ConfigDict(frozen=True, extra="allow")
+
+    def to_opossum_file_format(self) -> opossum_file.BaseUrlsForSources:
+        return opossum_file.BaseUrlsForSources(**self.model_dump())
+
+
+class FrequentLicense(BaseModel):
+    model_config = ConfigDict(frozen=True, extra="forbid")
+    full_name: str
+    short_name: str
+    default_text: str
+
+    def to_opossum_file_format(self) -> opossum_file.FrequentLicense:
+        return opossum_file.FrequentLicense(
+            full_name=self.full_name,
+            short_name=self.short_name,
+            default_text=self.default_text,
+        )
+
+
+class SourceInfo(BaseModel):
+    model_config = ConfigDict(frozen=True, extra="forbid")
+    name: str
+    document_confidence: int | float | None = 0
+    additional_name: str | None = None
+
+    def to_opossum_file_format(self) -> opossum_file.SourceInfo:
+        return opossum_file.SourceInfo(
+            name=self.name,
+            document_confidence=self.document_confidence,
+            additional_name=self.additional_name,
+        )
+
+
+class OpossumPackage(BaseModel):
+    model_config = ConfigDict(frozen=True, extra="forbid")
+    source: SourceInfo
+    attribution_confidence: int | None = None
+    comment: str | None = None
+    package_name: str | None = None
+    package_version: str | None = None
+    package_namespace: str | None = None
+    package_type: str | None = None
+    package_purl_appendix: str | None = None
+    copyright: str | None = None
+    license_name: str | None = None
+    license_text: str | None = None
+    url: str | None = None
+    first_party: bool | None = None
+    exclude_from_notice: bool | None = None
+    pre_selected: bool | None = None
+    follow_up: Literal["FOLLOW_UP"] | None = None
+    origin_id: str | None = None
+    origin_ids: list[str] | None = None
+    criticality: Literal["high"] | Literal["medium"] | None = None
+    was_preferred: bool | None = None
+
+    def to_opossum_file_format(self) -> opossum_file.OpossumPackage:
+        return opossum_file.OpossumPackage(
+            source=self.source.to_opossum_file_format(),
+            attribution_confidence=self.attribution_confidence,
+            comment=self.comment,
+            package_name=self.package_name,
+            package_version=self.package_version,
+            package_namespace=self.package_namespace,
+            package_type=self.package_type,
+            package_p_u_r_l_appendix=self.package_purl_appendix,
+            copyright=self.copyright,
+            license_name=self.license_name,
+            license_text=self.license_text,
+            url=self.url,
+            first_party=self.first_party,
+            exclude_from_notice=self.exclude_from_notice,
+            pre_selected=self.pre_selected,
+            follow_up=self.follow_up,
+            origin_id=self.origin_id,
+            origin_ids=self.origin_ids,
+            criticality=self.criticality,
+            was_preferred=self.was_preferred,
+        )
+
+
+class Metadata(BaseModel):
+    model_config = ConfigDict(frozen=True, extra="allow")
+    project_id: str
+    file_creation_date: str
+    project_title: str
+    project_version: str | None = None
+    expected_release_date: str | None = None
+    build_date: str | None = None
+
+    def to_opossum_file_format(self) -> opossum_file.Metadata:
+        return opossum_file.Metadata(**self.model_dump())
+
+
+class ExternalAttributionSource(BaseModel):
+    model_config = ConfigDict(frozen=True, extra="forbid")
+    name: str
+    priority: int
+    is_relevant_for_preferred: bool | None = None
+
+    def to_opossum_file_format(self) -> opossum_file.ExternalAttributionSource:
+        return opossum_file.ExternalAttributionSource(
+            name=self.name,
+            priority=self.priority,
+            is_relevant_for_preferred=self.is_relevant_for_preferred,
+        )

src/opossum_lib/scancode/convert_scancode_to_opossum.py

@@ -8,15 +8,10 @@
 import sys
 import uuid
 
-from opossum_lib.opossum.opossum_file import (
-    Metadata,
-    OpossumInformation,
-)
+import opossum_lib.opossum_model as opossum_model
 from opossum_lib.opossum.opossum_file_content import OpossumFileContent
 from opossum_lib.scancode.model import Header, ScanCodeData
 from opossum_lib.scancode.resource_tree import (
-    convert_to_opossum_resources,
-    create_attribution_mapping,
     scancode_to_file_tree,
 )
 
@@ -26,29 +21,19 @@ def convert_scancode_to_opossum(filename: str) -> OpossumFileContent:
 
     scancode_data = load_scancode_json(filename)
 
-    filetree = scancode_to_file_tree(scancode_data)
-    resources = convert_to_opossum_resources(filetree)
-    external_attributions, resources_to_attributions = create_attribution_mapping(
-        filetree
-    )
+    resources = [scancode_to_file_tree(scancode_data)]
 
     scancode_header = extract_scancode_header(scancode_data, filename)
-    metadata = Metadata(
+    metadata = opossum_model.Metadata(
         project_id=str(uuid.uuid4()),
         file_creation_date=scancode_header.end_timestamp,
         project_title="ScanCode file",
     )
 
-    return OpossumFileContent(
-        OpossumInformation(
-            metadata=metadata,
-            resources=resources,
-            external_attributions=external_attributions,
-            resources_to_attributions=resources_to_attributions,
-            attribution_breakpoints=[],
-            external_attribution_sources={},
-        )
-    )
+    return opossum_model.Opossum(
+        metadata=metadata,
+        resources=resources,
+    ).to_opossum_file_format()
 
 
 def load_scancode_json(filename: str) -> ScanCodeData: