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package pkg
import (
"bytes"
"crypto/sha512"
"fmt"
"io"
)
// A fileArtifact is an [Artifact] that cures into data known ahead of time.
type fileArtifact []byte
var _ KnownChecksum = new(fileArtifact)
// fileArtifactNamed embeds fileArtifact alongside a caller-supplied name.
type fileArtifactNamed struct {
fileArtifact
// Caller-supplied user-facing reporting name.
name string
}
var _ fmt.Stringer = new(fileArtifactNamed)
var _ KnownChecksum = new(fileArtifactNamed)
// String returns the caller-supplied reporting name.
func (a *fileArtifactNamed) String() string { return a.name }
// NewFile returns a [FileArtifact] that cures into a caller-supplied byte slice.
//
// Caller must not modify data after NewFile returns.
func NewFile(name string, data []byte) FileArtifact {
f := fileArtifact(data)
if name != "" {
return &fileArtifactNamed{f, name}
}
return &f
}
// Kind returns the hardcoded [Kind] constant.
func (*fileArtifact) Kind() Kind { return KindFile }
// Params writes the result of Cure.
func (a *fileArtifact) Params(ctx *IContext) { ctx.GetHash().Write(*a) }
// Dependencies returns a nil slice.
func (*fileArtifact) Dependencies() []Artifact { return nil }
// IsExclusive returns false: Cure returns a prepopulated buffer.
func (*fileArtifact) IsExclusive() bool { return false }
// Checksum computes and returns the checksum of caller-supplied data.
func (a *fileArtifact) Checksum() Checksum {
h := sha512.New384()
h.Write(*a)
return Checksum(h.Sum(nil))
}
// Cure returns the caller-supplied data.
func (a *fileArtifact) Cure(*RContext) (io.ReadCloser, error) {
return io.NopCloser(bytes.NewReader(*a)), nil
}
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