122 lines
3.0 KiB
Go
122 lines
3.0 KiB
Go
package agentcap
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"strings"
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"golang.org/x/crypto/hkdf"
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)
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const Prefix = "AJZ1"
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// Descriptor 智能体解密后才能看到的请求契约（前端不展示明文）。
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type Descriptor struct {
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Version string `json:"v"`
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BaseURL string `json:"base_url"`
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AppSlug string `json:"app_slug"`
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TenantHint string `json:"tenant_hint,omitempty"`
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Auth AuthSpec `json:"auth"`
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Resources []ResourceSpec `json:"resources"`
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Notes string `json:"notes,omitempty"`
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}
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type AuthSpec struct {
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Type string `json:"type"` // bearer_jwt
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Header string `json:"header"`
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}
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type ResourceSpec struct {
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Name string `json:"name"`
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Path string `json:"path"`
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Methods []string `json:"methods"`
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Filters []string `json:"filters,omitempty"`
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Sorts []string `json:"sorts,omitempty"`
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Fields []FieldSpec `json:"fields,omitempty"`
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PrimaryKey string `json:"primary_key"`
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}
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type FieldSpec struct {
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Name string `json:"name"`
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Type string `json:"type"`
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}
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func DeriveKey(masterSecret string, tenantID int64, userID int64) []byte {
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h := hkdf.New(sha256.New, []byte(masterSecret), []byte("aijianzhan-agent-v1"), []byte(fmt.Sprintf("%d:%d", tenantID, userID)))
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key := make([]byte, 32)
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_, _ = io.ReadFull(h, key)
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return key
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}
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func Encrypt(key []byte, desc *Descriptor) (string, error) {
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raw, err := json.Marshal(desc)
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nil, nonce, raw, nil)
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return fmt.Sprintf("%s.%s.%s",
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Prefix,
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base64.RawURLEncoding.EncodeToString(nonce),
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base64.RawURLEncoding.EncodeToString(ciphertext),
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), nil
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}
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func Decrypt(key []byte, capsule string) (*Descriptor, error) {
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parts := strings.Split(capsule, ".")
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if len(parts) != 3 || parts[0] != Prefix {
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return nil, fmt.Errorf("invalid capsule format")
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}
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nonce, err := base64.RawURLEncoding.DecodeString(parts[1])
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if err != nil {
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return nil, err
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}
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ciphertext, err := base64.RawURLEncoding.DecodeString(parts[2])
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if err != nil {
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return nil, err
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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plain, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, fmt.Errorf("decrypt failed")
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}
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var desc Descriptor
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if err := json.Unmarshal(plain, &desc); err != nil {
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return nil, err
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}
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return &desc, nil
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}
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func PublicAgentKey(masterSecret string, tenantID, userID int64) string {
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key := DeriveKey(masterSecret, tenantID, userID)
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return base64.RawURLEncoding.EncodeToString(key)
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}
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func ParseAgentKey(b64 string) ([]byte, error) {
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return base64.RawURLEncoding.DecodeString(b64)
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}
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