forked from TrueCloudLab/certificates
115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
package authority
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import (
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"crypto/sha1"
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"encoding/binary"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"math"
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"net/http"
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"sort"
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"strings"
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"github.com/pkg/errors"
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)
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// DefaultProvisionersLimit is the default limit for listing provisioners.
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const DefaultProvisionersLimit = 20
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// DefaultProvisionersMax is the maximum limit for listing provisioners.
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const DefaultProvisionersMax = 100
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// GetEncryptedKey returns the JWE key corresponding to the given kid argument.
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func (a *Authority) GetEncryptedKey(kid string) (string, error) {
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val, ok := a.encryptedKeyIndex.Load(kid)
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if !ok {
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return "", &apiError{errors.Errorf("encrypted key with kid %s was not found", kid),
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http.StatusNotFound, context{}}
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}
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key, ok := val.(string)
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if !ok {
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return "", &apiError{errors.Errorf("stored value is not a string"),
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http.StatusInternalServerError, context{}}
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}
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return key, nil
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}
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// GetProvisioners returns a map listing each provisioner and the JWK Key Set
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// with their public keys.
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func (a *Authority) GetProvisioners(cursor string, limit int) ([]*Provisioner, string, error) {
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provisioners, nextCursor := a.sortedProvisioners.Find(cursor, limit)
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return provisioners, nextCursor, nil
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}
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type uidProvisioner struct {
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provisioner *Provisioner
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uid string
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}
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func newSortedProvisioners(provisioners []*Provisioner) (provisionerSlice, error) {
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if len(provisioners) > math.MaxUint32 {
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return nil, errors.New("too many provisioners")
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}
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var slice provisionerSlice
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bi := make([]byte, 4)
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for i, p := range provisioners {
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sum, err := provisionerSum(p)
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if err != nil {
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return nil, err
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}
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// Use the first 4 bytes (32bit) of the sum to insert the order
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// Using big endian format to get the strings sorted:
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// 0x00000000, 0x00000001, 0x00000002, ...
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binary.BigEndian.PutUint32(bi, uint32(i))
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sum[0], sum[1], sum[2], sum[3] = bi[0], bi[1], bi[2], bi[3]
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bi[0], bi[1], bi[2], bi[3] = 0, 0, 0, 0
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slice = append(slice, uidProvisioner{
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provisioner: p,
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uid: hex.EncodeToString(sum),
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})
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}
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sort.Sort(slice)
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return slice, nil
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}
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type provisionerSlice []uidProvisioner
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func (p provisionerSlice) Len() int { return len(p) }
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func (p provisionerSlice) Less(i, j int) bool { return p[i].uid < p[j].uid }
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func (p provisionerSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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func (p provisionerSlice) Find(cursor string, limit int) ([]*Provisioner, string) {
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switch {
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case limit <= 0:
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limit = DefaultProvisionersLimit
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case limit > DefaultProvisionersMax:
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limit = DefaultProvisionersMax
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}
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n := len(p)
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cursor = fmt.Sprintf("%040s", cursor)
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i := sort.Search(n, func(i int) bool { return p[i].uid >= cursor })
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var slice []*Provisioner
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for ; i < n && len(slice) < limit; i++ {
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slice = append(slice, p[i].provisioner)
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}
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if i < n {
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return slice, strings.TrimLeft(p[i].uid, "0")
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}
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return slice, ""
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}
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// provisionerSum returns the SHA1 of the json representation of the
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// provisioner. From this we will create the unique and sorted id.
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func provisionerSum(p *Provisioner) ([]byte, error) {
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b, err := json.Marshal(p.Key)
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if err != nil {
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return nil, errors.Wrap(err, "error marshalling provisioner")
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}
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sum := sha1.Sum(b)
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return sum[:], nil
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}
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