github.com/lineaje-labs/syft@v0.98.1-0.20231227153149-9e393f60ff1b/syft/pkg/cataloger/haskell/parse_stack_lock.go (about)

     1  package haskell
     2  
     3  import (
     4  	"fmt"
     5  	"io"
     6  	"strings"
     7  
     8  	"gopkg.in/yaml.v3"
     9  
    10  	"github.com/anchore/syft/syft/artifact"
    11  	"github.com/anchore/syft/syft/file"
    12  	"github.com/anchore/syft/syft/pkg"
    13  	"github.com/anchore/syft/syft/pkg/cataloger/generic"
    14  	"github.com/lineaje-labs/syft/internal/log"
    15  )
    16  
    17  var _ generic.Parser = parseStackLock
    18  
    19  type stackLock struct {
    20  	Packages  []stackPackage  `yaml:"packages"`
    21  	Snapshots []stackSnapshot `yaml:"snapshots"`
    22  }
    23  
    24  type stackPackage struct {
    25  	Completed completedPackage `yaml:"completed"`
    26  }
    27  
    28  type completedPackage struct {
    29  	Hackage string `yaml:"hackage"`
    30  }
    31  
    32  type stackSnapshot struct {
    33  	Completed completedSnapshot `yaml:"completed"`
    34  }
    35  
    36  type completedSnapshot struct {
    37  	URL string `yaml:"url"`
    38  	Sha string `yaml:"sha256"`
    39  }
    40  
    41  // parseStackLock is a parser function for stack.yaml.lock contents, returning all packages discovered.
    42  func parseStackLock(
    43  	_ file.Resolver, _ *generic.Environment, reader file.LocationReadCloser,
    44  ) ([]pkg.Package, []artifact.Relationship, error) {
    45  	bytes, err := io.ReadAll(reader)
    46  	if err != nil {
    47  		return nil, nil, fmt.Errorf("failed to load stack.yaml.lock file: %w", err)
    48  	}
    49  
    50  	var lockFile stackLock
    51  
    52  	if err := yaml.Unmarshal(bytes, &lockFile); err != nil {
    53  		log.WithFields("error", err).Tracef("failed to parse stack.yaml.lock file %q", reader.RealPath)
    54  		return nil, nil, nil
    55  	}
    56  
    57  	var (
    58  		pkgs        []pkg.Package
    59  		snapshotURL string
    60  	)
    61  
    62  	for _, snap := range lockFile.Snapshots {
    63  		// TODO: handle multiple snapshots (split the metadata struct into more distinct structs and types)
    64  		snapshotURL = snap.Completed.URL
    65  	}
    66  
    67  	for _, pack := range lockFile.Packages {
    68  		pkgName, pkgVersion, pkgHash := parseStackPackageEncoding(pack.Completed.Hackage)
    69  		pkgs = append(
    70  			pkgs,
    71  			newPackage(
    72  				pkgName,
    73  				pkgVersion,
    74  				pkg.HackageStackYamlLockEntry{
    75  					PkgHash:     pkgHash,
    76  					SnapshotURL: snapshotURL,
    77  				},
    78  				reader.Location,
    79  			),
    80  		)
    81  	}
    82  
    83  	return pkgs, nil, nil
    84  }
    85  func parseStackPackageEncoding(pkgEncoding string) (name, version, hash string) {
    86  	lastDashIdx := strings.LastIndex(pkgEncoding, "-")
    87  	name = pkgEncoding[:lastDashIdx]
    88  	remainingEncoding := pkgEncoding[lastDashIdx+1:]
    89  	encodingSplits := strings.Split(remainingEncoding, "@")
    90  	version = encodingSplits[0]
    91  	startHash, endHash := strings.Index(encodingSplits[1], ":")+1, strings.Index(encodingSplits[1], ",")
    92  	hash = encodingSplits[1][startHash:endHash]
    93  	return
    94  }