Contains the Concourse pipeline definition for building a line-server container
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package helpers
import (
"crypto/sha256"
"encoding/hex"
"io"
"unicode"
"gopkg.in/h2non/filetype.v1"
)
func DetectMime(r io.ReadSeeker) (string, error) {
// Get first 512 bytes for mimetype detection
header := make([]byte, 512)
r.Seek(0, 0)
r.Read(header)
r.Seek(0, 0)
kind, err := filetype.Match(header)
if err != nil {
return "application/octet-stream", err
} else if kind.MIME.Value != "" {
return kind.MIME.Value, nil
}
// Check if the file seems anything like text
if printable(header) {
return "text/plain", nil
} else {
return "application/octet-stream", nil
}
}
func Sha256sum(r io.ReadSeeker) (string, error) {
hasher := sha256.New()
r.Seek(0, 0)
_, err := io.Copy(hasher, r)
if err != nil {
return "", err
}
r.Seek(0, 0)
return hex.EncodeToString(hasher.Sum(nil)), nil
}
func printable(data []byte) bool {
for i, b := range data {
r := rune(b)
// A null terminator that's not at the beginning of the file
if r == 0 && i == 0 {
return false
} else if r == 0 && i < 0 {
continue
}
if r > unicode.MaxASCII {
return false
}
}
return true
}