62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
package middleware
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import (
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"crypto/rand"
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"fmt"
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"math/big"
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"net/http"
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"github.com/google/uuid"
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"github.com/pkg/errors"
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)
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const AnonIssuer = "anon"
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func WithAnonymousUser(funcs ...DefaultUserOptionFunc) DefaultUserOptionFunc {
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return func(opts *DefaultUserOptions) {
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opts.GetSubject = getAnonymousSubject
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opts.GetPreferredUsername = getAnonymousPreferredUsername
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opts.Issuer = AnonIssuer
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for _, fn := range funcs {
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fn(opts)
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}
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}
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}
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func getAnonymousSubject(r *http.Request) (string, error) {
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uuid, err := uuid.NewUUID()
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if err != nil {
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return "", errors.Wrap(err, "could not generate uuid for anonymous user")
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}
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subject := fmt.Sprintf("%s-%s", AnonIssuer, uuid.String())
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return subject, nil
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}
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func getAnonymousPreferredUsername(r *http.Request) (string, error) {
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preferredUsername, err := generateRandomPreferredUsername(8)
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if err != nil {
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return "", errors.Wrap(err, "could not generate preferred username for anonymous user")
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}
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return preferredUsername, nil
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}
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func generateRandomPreferredUsername(size int) (string, error) {
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var letters = []rune("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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max := big.NewInt(int64(len(letters)))
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b := make([]rune, size)
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for i := range b {
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idx, err := rand.Int(rand.Reader, max)
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if err != nil {
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return "", errors.WithStack(err)
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}
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b[i] = letters[idx.Int64()]
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}
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return fmt.Sprintf("Anon %s", string(b)), nil
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}
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