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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
package reader
import (
"fmt"
"strings"
gordfParser "github.com/spdx/gordf/rdfloader/parser"
"github.com/spdx/gordf/rdfwriter"
"github.com/spdx/tools-golang/spdx/v2/common"
"github.com/spdx/tools-golang/spdx/v2/v2_2"
)
// parsing the relationship that exists in the rdf document.
// Relationship is of type RefA relationType RefB.
// parsing the relationship appends the relationship to the current document's
// Relationships Slice.
func (parser *rdfParser2_2) parseRelationship(triple *gordfParser.Triple) (err error) {
reln := v2_2.Relationship{}
reln.RefA, err = getReferenceFromURI(triple.Subject.ID)
if err != nil {
return err
}
currState := parser.cache[triple.Object.ID]
if currState == nil {
// there is no entry about the state of current package node.
// this is the first time we're seeing this node.
parser.cache[triple.Object.ID] = &nodeState{
object: reln,
Color: WHITE,
}
} else if currState.Color == GREY {
// we have already started parsing this relationship node and we needn't parse it again.
return nil
}
// setting color of the state to grey to indicate that we've started to
// parse this node once.
parser.cache[triple.Object.ID].Color = GREY
// setting state color to black to indicate when we're done parsing this node.
defer func() { parser.cache[triple.Object.ID].Color = BLACK }()
for _, subTriple := range parser.nodeToTriples(triple.Object) {
switch subTriple.Predicate.ID {
case SPDX_RELATIONSHIP_TYPE:
// cardinality: exactly 1
reln.Relationship, err = getRelationshipTypeFromURI(subTriple.Object.ID)
case RDF_TYPE:
// cardinality: exactly 1
continue
case SPDX_RELATED_SPDX_ELEMENT:
// cardinality: exactly 1
// assumes: spdx-element is a uri
reln.RefB, err = getReferenceFromURI(subTriple.Object.ID)
if err != nil {
return err
}
relatedSpdxElementTriples := parser.nodeToTriples(subTriple.Object)
if len(relatedSpdxElementTriples) == 0 {
continue
}
typeTriples := rdfwriter.FilterTriples(relatedSpdxElementTriples, &subTriple.Object.ID, &RDF_TYPE, nil)
if len(typeTriples) != 1 {
return fmt.Errorf("expected %s to have exactly one rdf:type triple. found %d triples", subTriple.Object, len(typeTriples))
}
err = parser.parseRelatedElementFromTriple(&reln, typeTriples[0])
if err != nil {
return err
}
case RDFS_COMMENT:
// cardinality: max 1
reln.RelationshipComment = subTriple.Object.ID
default:
return fmt.Errorf("unexpected predicate id: %s", subTriple.Predicate.ID)
}
if err != nil {
return err
}
}
parser.doc.Relationships = append(parser.doc.Relationships, &reln)
return nil
}
func (parser *rdfParser2_2) parseRelatedElementFromTriple(reln *v2_2.Relationship, triple *gordfParser.Triple) error {
// iterate over relatedElement Type and check which SpdxElement it is.
var err error
switch triple.Object.ID {
case SPDX_FILE:
file, err := parser.getFileFromNode(triple.Subject)
if err != nil {
return fmt.Errorf("error setting a file: %v", err)
}
reln.RefB = common.DocElementID{
DocumentRefID: "",
ElementRefID: file.FileSPDXIdentifier,
}
case SPDX_PACKAGE:
pkg, err := parser.getPackageFromNode(triple.Subject)
if err != nil {
return fmt.Errorf("error setting a package inside a relationship: %v", err)
}
reln.RefB = common.DocElementID{
DocumentRefID: "",
ElementRefID: pkg.PackageSPDXIdentifier,
}
case SPDX_SPDX_ELEMENT:
// it shouldn't be associated with any other triple.
// it must be a uri reference.
reln.RefB, err = ExtractDocElementID(getLastPartOfURI(triple.Subject.ID))
if err != nil {
return err
}
default:
return fmt.Errorf("undefined relatedElement %s found while parsing relationship", triple.Object.ID)
}
return nil
}
// references like RefA and RefB of any relationship
func getReferenceFromURI(uri string) (common.DocElementID, error) {
fragment := getLastPartOfURI(uri)
switch strings.ToLower(strings.TrimSpace(fragment)) {
case "noassertion", "none":
return common.DocElementID{
DocumentRefID: "",
ElementRefID: common.ElementID(strings.ToUpper(fragment)),
}, nil
}
return ExtractDocElementID(fragment)
}
// note: relationshipType is case sensitive.
func getRelationshipTypeFromURI(relnTypeURI string) (string, error) {
relnTypeURI = strings.TrimSpace(relnTypeURI)
lastPart := getLastPartOfURI(relnTypeURI)
if !strings.HasPrefix(lastPart, PREFIX_RELATIONSHIP_TYPE) {
return "", fmt.Errorf("relationshipType must start with %s. found %s", PREFIX_RELATIONSHIP_TYPE, lastPart)
}
lastPart = strings.TrimPrefix(lastPart, PREFIX_RELATIONSHIP_TYPE)
lastPart = strings.TrimSpace(lastPart)
for _, validRelationshipType := range AllRelationshipTypes() {
if lastPart == validRelationshipType {
return lastPart, nil
}
}
return "", fmt.Errorf("unknown relationshipType: '%s'", lastPart)
}
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