UmputunandGitHub
7aee7add08
* move backend code #99 * adjust drone build for backend subdir * move .rest to backend
61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
package store
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import (
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"crypto/hmac"
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"crypto/sha1"
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"encoding/hex"
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"fmt"
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"hash/crc64"
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"io"
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"log"
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"regexp"
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)
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// User holds user-related info
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type User struct {
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Name string `json:"name"`
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ID string `json:"id"`
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Picture string `json:"picture"`
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IP string `json:"ip,omitempty"`
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Admin bool `json:"admin"`
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Blocked bool `json:"block,omitempty"`
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Verified bool `json:"verified,omitempty"`
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}
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var reValidSha = regexp.MustCompile("^[a-fA-F0-9]{40}$")
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// HashIP replace IP field with hashed hmac
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func (u *User) HashIP(secret string) {
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u.IP = HashValue(u.IP, secret)
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}
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// HashValue makes hmac with secret
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func HashValue(val string, secret string) string {
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if val == "" || reValidSha.MatchString(val) {
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return val // already hashed or empty
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}
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key := []byte(secret)
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h := hmac.New(sha1.New, key)
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if _, err := io.WriteString(h, val); err != nil {
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// fail back to crc64
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log.Printf("[WARN] can't hash ip, %s", err)
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return fmt.Sprintf("%x", crc64.Checksum([]byte(val), crc64.MakeTable(crc64.ECMA)))
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}
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return hex.EncodeToString(h.Sum(nil))
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}
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// EncodeID hashes id to sha1. The function intentionally left outside of User struct because in some cases
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// we need hashing for parts of id, in some others hashing for non-User values.
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func EncodeID(id string) string {
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if reValidSha.MatchString(id) {
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return id // already hashed or empty
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}
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h := sha1.New()
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if _, err := io.WriteString(h, id); err != nil {
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// fail back to crc64
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log.Printf("[WARN] can't hash id %s, %s", id, err)
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return fmt.Sprintf("%x", crc64.Checksum([]byte(id), crc64.MakeTable(crc64.ECMA)))
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}
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return hex.EncodeToString(h.Sum(nil))
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}
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