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How I write microservice (part 2)
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package helpers | |
import ( | |
"github.com/dchest/uniuri" | |
validation "github.com/go-ozzo/ozzo-validation" | |
"github.com/go-ozzo/ozzo-validation/is" | |
) | |
// IDGeneratedLength defines the length of the id string | |
const IDGeneratedLength = 32 | |
// IDGeneratorFunc returns a randomly generated string useable as identifier | |
var IDGeneratorFunc = func() string { | |
return uniuri.NewLen(IDGeneratedLength) | |
} | |
// IDValidationRules describes identifier contract for syntaxic validation | |
var IDValidationRules = []validation.Rule{ | |
validation.Required, | |
validation.Length(IDGeneratedLength, IDGeneratedLength), | |
is.Alphanumeric, | |
} |
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package helpers | |
import ( | |
"encoding/base64" | |
"golang.org/x/crypto/blake2b" | |
) | |
var principalHashKey = []byte(`7EcP%Sm5=Wgoce5Sb"%[E.<&xG8t5soYU$CzdIMTgK@^4i(Zo|)LoDB'!g"R2]8$`) | |
// PrincipalHashFunc return the principal hashed using Blake2b keyed algorithm | |
var PrincipalHashFunc = func(principal string) string { | |
// Prepare hasher | |
hasher, err:= blake2b.New512(principalHashKey) | |
if err!= nil { | |
panic(err) | |
} | |
// Append principal | |
_, err = hasher.Write([]byte(principal)) | |
if err!= nil { | |
panic(err) | |
} | |
// Return base64 hash value of the principal hash | |
return base64.RawStdEncoding.EncodeToString(hasher.Sum(nil)) | |
} | |
// SetPrincipalHashKey used to set the key of hash function | |
func SetPrincipalHashKey(key []byte) { | |
if len(key)!= 64 { | |
panic("Principal hash key length must be 64bytes long.") | |
} | |
principalHashKey = key | |
} |
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