diff options
Diffstat (limited to 'kube2msb/src/vendor/github.com/docker/distribution/digest/digest.go')
-rw-r--r-- | kube2msb/src/vendor/github.com/docker/distribution/digest/digest.go | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/kube2msb/src/vendor/github.com/docker/distribution/digest/digest.go b/kube2msb/src/vendor/github.com/docker/distribution/digest/digest.go deleted file mode 100644 index 31d821b..0000000 --- a/kube2msb/src/vendor/github.com/docker/distribution/digest/digest.go +++ /dev/null @@ -1,139 +0,0 @@ -package digest - -import ( - "fmt" - "hash" - "io" - "regexp" - "strings" -) - -const ( - // DigestSha256EmptyTar is the canonical sha256 digest of empty data - DigestSha256EmptyTar = "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" -) - -// Digest allows simple protection of hex formatted digest strings, prefixed -// by their algorithm. Strings of type Digest have some guarantee of being in -// the correct format and it provides quick access to the components of a -// digest string. -// -// The following is an example of the contents of Digest types: -// -// sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc -// -// This allows to abstract the digest behind this type and work only in those -// terms. -type Digest string - -// NewDigest returns a Digest from alg and a hash.Hash object. -func NewDigest(alg Algorithm, h hash.Hash) Digest { - return NewDigestFromBytes(alg, h.Sum(nil)) -} - -// NewDigestFromBytes returns a new digest from the byte contents of p. -// Typically, this can come from hash.Hash.Sum(...) or xxx.SumXXX(...) -// functions. This is also useful for rebuilding digests from binary -// serializations. -func NewDigestFromBytes(alg Algorithm, p []byte) Digest { - return Digest(fmt.Sprintf("%s:%x", alg, p)) -} - -// NewDigestFromHex returns a Digest from alg and a the hex encoded digest. -func NewDigestFromHex(alg, hex string) Digest { - return Digest(fmt.Sprintf("%s:%s", alg, hex)) -} - -// DigestRegexp matches valid digest types. -var DigestRegexp = regexp.MustCompile(`[a-zA-Z0-9-_+.]+:[a-fA-F0-9]+`) - -// DigestRegexpAnchored matches valid digest types, anchored to the start and end of the match. -var DigestRegexpAnchored = regexp.MustCompile(`^` + DigestRegexp.String() + `$`) - -var ( - // ErrDigestInvalidFormat returned when digest format invalid. - ErrDigestInvalidFormat = fmt.Errorf("invalid checksum digest format") - - // ErrDigestInvalidLength returned when digest has invalid length. - ErrDigestInvalidLength = fmt.Errorf("invalid checksum digest length") - - // ErrDigestUnsupported returned when the digest algorithm is unsupported. - ErrDigestUnsupported = fmt.Errorf("unsupported digest algorithm") -) - -// ParseDigest parses s and returns the validated digest object. An error will -// be returned if the format is invalid. -func ParseDigest(s string) (Digest, error) { - d := Digest(s) - - return d, d.Validate() -} - -// FromReader returns the most valid digest for the underlying content using -// the canonical digest algorithm. -func FromReader(rd io.Reader) (Digest, error) { - return Canonical.FromReader(rd) -} - -// FromBytes digests the input and returns a Digest. -func FromBytes(p []byte) Digest { - return Canonical.FromBytes(p) -} - -// Validate checks that the contents of d is a valid digest, returning an -// error if not. -func (d Digest) Validate() error { - s := string(d) - - if !DigestRegexpAnchored.MatchString(s) { - return ErrDigestInvalidFormat - } - - i := strings.Index(s, ":") - if i < 0 { - return ErrDigestInvalidFormat - } - - // case: "sha256:" with no hex. - if i+1 == len(s) { - return ErrDigestInvalidFormat - } - - switch algorithm := Algorithm(s[:i]); algorithm { - case SHA256, SHA384, SHA512: - if algorithm.Size()*2 != len(s[i+1:]) { - return ErrDigestInvalidLength - } - break - default: - return ErrDigestUnsupported - } - - return nil -} - -// Algorithm returns the algorithm portion of the digest. This will panic if -// the underlying digest is not in a valid format. -func (d Digest) Algorithm() Algorithm { - return Algorithm(d[:d.sepIndex()]) -} - -// Hex returns the hex digest portion of the digest. This will panic if the -// underlying digest is not in a valid format. -func (d Digest) Hex() string { - return string(d[d.sepIndex()+1:]) -} - -func (d Digest) String() string { - return string(d) -} - -func (d Digest) sepIndex() int { - i := strings.Index(string(d), ":") - - if i < 0 { - panic("could not find ':' in digest: " + d) - } - - return i -} |