1 files changed, 365 insertions, 0 deletions

diff --git a/vendor/github.com/google/uuid/uuid.go b/vendor/github.com/google/uuid/uuid.go
new file mode 100644
index 0000000..5232b48
--- /dev/null
+++ b/vendor/github.com/google/uuid/uuid.go
@@ -0,0 +1,365 @@
+// Copyright 2018 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+        "bytes"
+        "crypto/rand"
+        "encoding/hex"
+        "errors"
+        "fmt"
+        "io"
+        "strings"
+        "sync"
+)
+
+// A UUID is a 128 bit (16 byte) Universal Unique IDentifier as defined in RFC
+// 4122.
+type UUID [16]byte
+
+// A Version represents a UUID's version.
+type Version byte
+
+// A Variant represents a UUID's variant.
+type Variant byte
+
+// Constants returned by Variant.
+const (
+        Invalid   = Variant(iota) // Invalid UUID
+        RFC4122                   // The variant specified in RFC4122
+        Reserved                  // Reserved, NCS backward compatibility.
+        Microsoft                 // Reserved, Microsoft Corporation backward compatibility.
+        Future                    // Reserved for future definition.
+)
+
+const randPoolSize = 16 * 16
+
+var (
+        rander      = rand.Reader // random function
+        poolEnabled = false
+        poolMu      sync.Mutex
+        poolPos     = randPoolSize     // protected with poolMu
+        pool        [randPoolSize]byte // protected with poolMu
+)
+
+type invalidLengthError struct{ len int }
+
+func (err invalidLengthError) Error() string {
+        return fmt.Sprintf("invalid UUID length: %d", err.len)
+}
+
+// IsInvalidLengthError is matcher function for custom error invalidLengthError
+func IsInvalidLengthError(err error) bool {
+        _, ok := err.(invalidLengthError)
+        return ok
+}
+
+// Parse decodes s into a UUID or returns an error if it cannot be parsed.  Both
+// the standard UUID forms defined in RFC 4122
+// (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx and
+// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) are decoded.  In addition,
+// Parse accepts non-standard strings such as the raw hex encoding
+// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx and 38 byte "Microsoft style" encodings,
+// e.g.  {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}.  Only the middle 36 bytes are
+// examined in the latter case.  Parse should not be used to validate strings as
+// it parses non-standard encodings as indicated above.
+func Parse(s string) (UUID, error) {
+        var uuid UUID
+        switch len(s) {
+        // xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+        case 36:
+
+        // urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+        case 36 + 9:
+                if !strings.EqualFold(s[:9], "urn:uuid:") {
+                        return uuid, fmt.Errorf("invalid urn prefix: %q", s[:9])
+                }
+                s = s[9:]
+
+        // {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+        case 36 + 2:
+                s = s[1:]
+
+        // xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+        case 32:
+                var ok bool
+                for i := range uuid {
+                        uuid[i], ok = xtob(s[i*2], s[i*2+1])
+                        if !ok {
+                                return uuid, errors.New("invalid UUID format")
+                        }
+                }
+                return uuid, nil
+        default:
+                return uuid, invalidLengthError{len(s)}
+        }
+        // s is now at least 36 bytes long
+        // it must be of the form  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+        if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
+                return uuid, errors.New("invalid UUID format")
+        }
+        for i, x := range [16]int{
+                0, 2, 4, 6,
+                9, 11,
+                14, 16,
+                19, 21,
+                24, 26, 28, 30, 32, 34,
+        } {
+                v, ok := xtob(s[x], s[x+1])
+                if !ok {
+                        return uuid, errors.New("invalid UUID format")
+                }
+                uuid[i] = v
+        }
+        return uuid, nil
+}
+
+// ParseBytes is like Parse, except it parses a byte slice instead of a string.
+func ParseBytes(b []byte) (UUID, error) {
+        var uuid UUID
+        switch len(b) {
+        case 36: // xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+        case 36 + 9: // urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+                if !bytes.EqualFold(b[:9], []byte("urn:uuid:")) {
+                        return uuid, fmt.Errorf("invalid urn prefix: %q", b[:9])
+                }
+                b = b[9:]
+        case 36 + 2: // {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+                b = b[1:]
+        case 32: // xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+                var ok bool
+                for i := 0; i < 32; i += 2 {
+                        uuid[i/2], ok = xtob(b[i], b[i+1])
+                        if !ok {
+                                return uuid, errors.New("invalid UUID format")
+                        }
+                }
+                return uuid, nil
+        default:
+                return uuid, invalidLengthError{len(b)}
+        }
+        // s is now at least 36 bytes long
+        // it must be of the form  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+        if b[8] != '-' || b[13] != '-' || b[18] != '-' || b[23] != '-' {
+                return uuid, errors.New("invalid UUID format")
+        }
+        for i, x := range [16]int{
+                0, 2, 4, 6,
+                9, 11,
+                14, 16,
+                19, 21,
+                24, 26, 28, 30, 32, 34,
+        } {
+                v, ok := xtob(b[x], b[x+1])
+                if !ok {
+                        return uuid, errors.New("invalid UUID format")
+                }
+                uuid[i] = v
+        }
+        return uuid, nil
+}
+
+// MustParse is like Parse but panics if the string cannot be parsed.
+// It simplifies safe initialization of global variables holding compiled UUIDs.
+func MustParse(s string) UUID {
+        uuid, err := Parse(s)
+        if err != nil {
+                panic(`uuid: Parse(` + s + `): ` + err.Error())
+        }
+        return uuid
+}
+
+// FromBytes creates a new UUID from a byte slice. Returns an error if the slice
+// does not have a length of 16. The bytes are copied from the slice.
+func FromBytes(b []byte) (uuid UUID, err error) {
+        err = uuid.UnmarshalBinary(b)
+        return uuid, err
+}
+
+// Must returns uuid if err is nil and panics otherwise.
+func Must(uuid UUID, err error) UUID {
+        if err != nil {
+                panic(err)
+        }
+        return uuid
+}
+
+// Validate returns an error if s is not a properly formatted UUID in one of the following formats:
+//   xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+//   urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+//   xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+//   {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+// It returns an error if the format is invalid, otherwise nil.
+func Validate(s string) error {
+        switch len(s) {
+        // Standard UUID format
+        case 36:
+
+        // UUID with "urn:uuid:" prefix
+        case 36 + 9:
+                if !strings.EqualFold(s[:9], "urn:uuid:") {
+                        return fmt.Errorf("invalid urn prefix: %q", s[:9])
+                }
+                s = s[9:]
+
+        // UUID enclosed in braces
+        case 36 + 2:
+                if s[0] != '{' || s[len(s)-1] != '}' {
+                        return fmt.Errorf("invalid bracketed UUID format")
+                }
+                s = s[1 : len(s)-1]
+
+        // UUID without hyphens
+        case 32:
+                for i := 0; i < len(s); i += 2 {
+                        _, ok := xtob(s[i], s[i+1])
+                        if !ok {
+                                return errors.New("invalid UUID format")
+                        }
+                }
+
+        default:
+                return invalidLengthError{len(s)}
+        }
+
+        // Check for standard UUID format
+        if len(s) == 36 {
+                if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
+                        return errors.New("invalid UUID format")
+                }
+                for _, x := range []int{0, 2, 4, 6, 9, 11, 14, 16, 19, 21, 24, 26, 28, 30, 32, 34} {
+                        if _, ok := xtob(s[x], s[x+1]); !ok {
+                                return errors.New("invalid UUID format")
+                        }
+                }
+        }
+
+        return nil
+}
+
+// String returns the string form of uuid, xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+// , or "" if uuid is invalid.
+func (uuid UUID) String() string {
+        var buf [36]byte
+        encodeHex(buf[:], uuid)
+        return string(buf[:])
+}
+
+// URN returns the RFC 2141 URN form of uuid,
+// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx,  or "" if uuid is invalid.
+func (uuid UUID) URN() string {
+        var buf [36 + 9]byte
+        copy(buf[:], "urn:uuid:")
+        encodeHex(buf[9:], uuid)
+        return string(buf[:])
+}
+
+func encodeHex(dst []byte, uuid UUID) {
+        hex.Encode(dst, uuid[:4])
+        dst[8] = '-'
+        hex.Encode(dst[9:13], uuid[4:6])
+        dst[13] = '-'
+        hex.Encode(dst[14:18], uuid[6:8])
+        dst[18] = '-'
+        hex.Encode(dst[19:23], uuid[8:10])
+        dst[23] = '-'
+        hex.Encode(dst[24:], uuid[10:])
+}
+
+// Variant returns the variant encoded in uuid.
+func (uuid UUID) Variant() Variant {
+        switch {
+        case (uuid[8] & 0xc0) == 0x80:
+                return RFC4122
+        case (uuid[8] & 0xe0) == 0xc0:
+                return Microsoft
+        case (uuid[8] & 0xe0) == 0xe0:
+                return Future
+        default:
+                return Reserved
+        }
+}
+
+// Version returns the version of uuid.
+func (uuid UUID) Version() Version {
+        return Version(uuid[6] >> 4)
+}
+
+func (v Version) String() string {
+        if v > 15 {
+                return fmt.Sprintf("BAD_VERSION_%d", v)
+        }
+        return fmt.Sprintf("VERSION_%d", v)
+}
+
+func (v Variant) String() string {
+        switch v {
+        case RFC4122:
+                return "RFC4122"
+        case Reserved:
+                return "Reserved"
+        case Microsoft:
+                return "Microsoft"
+        case Future:
+                return "Future"
+        case Invalid:
+                return "Invalid"
+        }
+        return fmt.Sprintf("BadVariant%d", int(v))
+}
+
+// SetRand sets the random number generator to r, which implements io.Reader.
+// If r.Read returns an error when the package requests random data then
+// a panic will be issued.
+//
+// Calling SetRand with nil sets the random number generator to the default
+// generator.
+func SetRand(r io.Reader) {
+        if r == nil {
+                rander = rand.Reader
+                return
+        }
+        rander = r
+}
+
+// EnableRandPool enables internal randomness pool used for Random
+// (Version 4) UUID generation. The pool contains random bytes read from
+// the random number generator on demand in batches. Enabling the pool
+// may improve the UUID generation throughput significantly.
+//
+// Since the pool is stored on the Go heap, this feature may be a bad fit
+// for security sensitive applications.
+//
+// Both EnableRandPool and DisableRandPool are not thread-safe and should
+// only be called when there is no possibility that New or any other
+// UUID Version 4 generation function will be called concurrently.
+func EnableRandPool() {
+        poolEnabled = true
+}
+
+// DisableRandPool disables the randomness pool if it was previously
+// enabled with EnableRandPool.
+//
+// Both EnableRandPool and DisableRandPool are not thread-safe and should
+// only be called when there is no possibility that New or any other
+// UUID Version 4 generation function will be called concurrently.
+func DisableRandPool() {
+        poolEnabled = false
+        defer poolMu.Unlock()
+        poolMu.Lock()
+        poolPos = randPoolSize
+}
+
+// UUIDs is a slice of UUID types.
+type UUIDs []UUID
+
+// Strings returns a string slice containing the string form of each UUID in uuids.
+func (uuids UUIDs) Strings() []string {
+        var uuidStrs = make([]string, len(uuids))
+        for i, uuid := range uuids {
+                uuidStrs[i] = uuid.String()
+        }
+        return uuidStrs
+}