379 lines
16 KiB
Go
379 lines
16 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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// Production‑ready **minimal** ACME CA with MySQL persistence.
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// Implements:
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// * http‑01 **and** dns‑01 challenges (toggle via ENV)
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// * Automated TXT‑record publish through a pluggable DNS provider (demo HTTP JSON API)
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// * OCSP responder & CRL, data sourced from MySQL (revoked_at column)
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// * Full JWS verification (kid & jwk modes) for every ACME request (toggle)
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//
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// ENV (defaults in brackets):
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// DNS01_ENABLED [false] – issue dns‑01 challenges additionally
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// DNS_PROVIDER_URL [""] – POST endpoint to create/delete TXT (if empty => noop)
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// DNS_PROVIDER_TOKEN [""] – Bearer Auth header for provider API
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// OCSP_ENABLED [false]
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// CRL_ENABLED [false]
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// JWS_VERIFY_ENABLED [true]
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// MYSQL_DSN [root:root@tcp(localhost:3306)/acme?parseTime=true&multiStatements=true]
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// CA_CERT_PATH ./ca_cert.pem, CA_KEY_PATH ./ca_key.pem, PORT 8080, ACME_ALLOWED_DOMAIN example.com
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//
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// **Security notes**: still no rate‑limits, HSM, or full ACME corner‑cases.
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package main
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import (
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"bytes"
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"crypto"
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"crypto/rand"
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"crypto/x509"
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"crypto/x509/pkix"
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"database/sql"
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"encoding/base64"
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"encoding/json"
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"encoding/pem"
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"errors"
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"fmt"
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"io"
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"log"
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"math/big"
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"net/http"
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"net/url"
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"os"
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"strconv"
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"strings"
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"time"
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_ "github.com/go-sql-driver/mysql"
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"github.com/google/uuid"
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jose "github.com/square/go-jose/v3"
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"github.com/square/go-jose/v3/jwt"
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"golang.org/x/crypto/acme"
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"golang.org/x/crypto/acme/autocert"
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"golang.org/x/crypto/ocsp"
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)
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// -----------------------------------------------------------------------------
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// ENV helpers
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// -----------------------------------------------------------------------------
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func getenv(k, d string) string { if v := os.Getenv(k); v != "" { return v }; return d }
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func enabled(k string, def bool) bool { b, err := strconv.ParseBool(strings.ToLower(os.Getenv(k))); if err != nil { return def }; return b }
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var (
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dns01Enabled = enabled("DNS01_ENABLED", false)
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ocspEnabled = enabled("OCSP_ENABLED", false)
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crlEnabled = enabled("CRL_ENABLED", false)
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jwsVerify = enabled("JWS_VERIFY_ENABLED", true)
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dnsAPI = getenv("DNS_PROVIDER_URL", "")
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dnsAPIToken = getenv("DNS_PROVIDER_TOKEN", "")
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)
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// -----------------------------------------------------------------------------
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// CA struct – CRL/OCSP backed by MySQL store
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// -----------------------------------------------------------------------------
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type ca struct {
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cert *x509.Certificate
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key crypto.Signer
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db *mysqlStore
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}
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func newCA(certPath, keyPath string, db *mysqlStore) (*ca, error) {
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certPEM, err := os.ReadFile(certPath)
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if err != nil { return nil, err }
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blk, _ := pem.Decode(certPEM)
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if blk == nil { return nil, errors.New("no cert pem") }
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cert, err := x509.ParseCertificate(blk.Bytes)
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if err != nil { return nil, err }
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keyPEM, err := os.ReadFile(keyPath)
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if err != nil { return nil, err }
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pk, err := parseKey(keyPEM)
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if err != nil { return nil, err }
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signer, ok := pk.(crypto.Signer)
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if !ok { return nil, errors.New("key not signer") }
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return &ca{cert: cert, key: signer, db: db}, nil
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}
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func parseKey(b []byte) (crypto.PrivateKey, error) {
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blk, _ := pem.Decode(b)
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if blk == nil { return nil, errors.New("no key pem") }
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switch blk.Type {
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case "RSA PRIVATE KEY":
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return x509.ParsePKCS1PrivateKey(blk.Bytes)
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case "EC PRIVATE KEY":
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return x509.ParseECPrivateKey(blk.Bytes)
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default:
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return x509.ParsePKCS8PrivateKey(blk.Bytes)
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}
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}
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// build OCSP response using DB revocation info
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func (c *ca) ocspResponse(serial *big.Int) ([]byte, error) {
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revokedAt, good := c.db.serialRevoked(serial.String())
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resp := ocsp.Response{
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SerialNumber: serial,
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ProducedAt: time.Now(),
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ThisUpdate: time.Now(),
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NextUpdate: time.Now().Add(24 * time.Hour),
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IssuerHash: crypto.SHA256,
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Certificate: c.cert,
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}
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if !good {
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resp.Status = ocsp.Revoked
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resp.RevokedAt = revokedAt
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} else {
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resp.Status = ocsp.Good
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}
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return ocsp.CreateResponse(c.cert, c.cert, resp, c.key)
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}
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func (c *ca) crlPEM() ([]byte, error) {
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list, err := c.db.revokedSerials()
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if err != nil { return nil, err }
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revoked := []pkix.RevokedCertificate{}
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for sn, ts := range list {
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i := new(big.Int)
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i.SetString(sn, 10)
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revoked = append(revoked, pkix.RevokedCertificate{SerialNumber: i, RevocationTime: ts})
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}
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der, err := c.cert.CreateCRL(rand.Reader, c.key, revoked, time.Now(), time.Now().Add(7*24*time.Hour))
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if err != nil { return nil, err }
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return pem.EncodeToMemory(&pem.Block{Type: "X509 CRL", Bytes: der}), nil
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}
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// -----------------------------------------------------------------------------
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// MySQL store – now tracks revocation & dns tokens
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// -----------------------------------------------------------------------------
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type mysqlStore struct{ db *sql.DB }
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func newMySQLStore(dsn string) (*mysqlStore, error) {
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db, err := sql.Open("mysql", dsn)
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if err != nil { return nil, err }
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if err := db.Ping(); err != nil { return nil, err }
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s := &mysqlStore{db: db}
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return s, s.init()
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}
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func (s *mysqlStore) init() error {
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schema := `
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CREATE TABLE IF NOT EXISTS nonces(id VARCHAR(255) PRIMARY KEY,created TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
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CREATE TABLE IF NOT EXISTS accounts(id VARCHAR(36) PRIMARY KEY,jwk JSON,created TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
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CREATE TABLE IF NOT EXISTS orders(id VARCHAR(36) PRIMARY KEY,payload JSON,status VARCHAR(20),finalize_url VARCHAR(255),created TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
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CREATE TABLE IF NOT EXISTS authzs(id VARCHAR(36) PRIMARY KEY,order_id VARCHAR(36),identifier VARCHAR(255),status VARCHAR(20),payload JSON,created TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
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CREATE TABLE IF NOT EXISTS challenges(id VARCHAR(36) PRIMARY KEY,authz_id VARCHAR(36),type VARCHAR(20),token VARCHAR(100),status VARCHAR(20),payload JSON,created TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
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CREATE TABLE IF NOT EXISTS certs(id VARCHAR(36) PRIMARY KEY,serial VARCHAR(40),der LONGBLOB,revoked_at TIMESTAMP NULL,created TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
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`
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_, err := s.db.Exec(schema)
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return err
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}
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// nonce helpers
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func (s *mysqlStore) storeNonce(n string) { _, _ = s.db.Exec(`INSERT INTO nonces(id) VALUES (?)`, n) }
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func (s *mysqlStore) consumeNonce(n string) bool {
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res, _ := s.db.Exec(`DELETE FROM nonces WHERE id=?`, n)
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c, _ := res.RowsAffected(); return c > 0
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}
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// account helpers (store jwk for kid verification)
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func (s *mysqlStore) insertAccount(id string, jwk *jose.JSONWebKey) { data, _ := json.Marshal(jwk); _, _ = s.db.Exec(`INSERT INTO accounts(id,jwk) VALUES (?,?)`, id, data) }
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func (s *mysqlStore) accountKey(id string) (*jose.JSONWebKey, error) {
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var raw []byte
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if err := s.db.QueryRow(`SELECT jwk FROM accounts WHERE id=?`, id).Scan(&raw); err != nil { return nil, err }
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var k jose.JSONWebKey; _ = json.Unmarshal(raw, &k); return &k, nil
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}
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// cert helpers
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func (s *mysqlStore) insertCert(id string, der []byte, serial *big.Int) { _, _ = s.db.Exec(`INSERT INTO certs(id,serial,der) VALUES (?,?,?)`, id, serial.String(), der) }
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func (s *mysqlStore) serialRevoked(sn string) (time.Time, bool) {
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var t sql.NullTime
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if err := s.db.QueryRow(`SELECT revoked_at FROM certs WHERE serial=?`, sn).Scan(&t); err != nil { return time.Time{}, true }
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return t.Time, !t.Valid
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}
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func (s *mysqlStore) revokeSerial(sn string) { _, _ = s.db.Exec(`UPDATE certs SET revoked_at=NOW() WHERE serial=?`, sn) }
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func (s *mysqlStore) revokedSerials() (map[string]time.Time, error) {
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rows, err := s.db.Query(`SELECT serial, revoked_at FROM certs WHERE revoked_at IS NOT NULL`)
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if err != nil { return nil, err }
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out := map[string]time.Time{}
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for rows.Next() {
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var sn string; var ts time.Time; _ = rows.Scan(&sn, &ts); out[sn] = ts
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}
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return out, nil
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}
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// generic helpers for orders/authzs/challenges (omitted for brevity – similar to earlier)
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// -----------------------------------------------------------------------------
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// DNS provider integration (simple REST)
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// -----------------------------------------------------------------------------
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func publishTXT(fqdn, token string, present bool) {
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if dnsAPI == "" { log.Printf("dns‑api noop for %s", fqdn); return }
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payload := map[string]string{"fqdn": fqdn, "token": token}
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body, _ := json.Marshal(payload)
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method := "POST"
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if !present { method = "DELETE" }
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req, _ := http.NewRequest(method, dnsAPI, bytes.NewReader(body))
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req.Header.Set("Authorization", "Bearer "+dnsAPIToken)
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req.Header.Set("Content-Type", "application/json")
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go func() {
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resp, err := http.DefaultClient.Do(req)
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if err != nil { log.Printf("dns‑api err: %v", err); return }
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resp.Body.Close()
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}()
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}
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// -----------------------------------------------------------------------------
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// ACME server – only changed parts shown (JWS verify & dns01 integration)
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// -----------------------------------------------------------------------------
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type server struct {
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ca *ca
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db *mysqlStore
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mgr *autocert.Manager
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}
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func newServer(ca *ca, db *mysqlStore, allowed string) *server {
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mgr := &autocert.Manager{Prompt: autocert.AcceptTOS, HostPolicy: autocert.HostWhitelist(allowed), Cache: autocert.DirCache("cert-cache")}
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return &server{ca: ca, db: db, mgr: mgr}
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}
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// --------------------- JWS verify wrapper ---------------------
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type jwsPayload struct {
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Data []byte
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Kid string
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}
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func (s *server) readJWS(w http.ResponseWriter, r *http.Request) (*jwsPayload, bool) {
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if !jwsVerify {
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p, _ := io.ReadAll(r.Body)
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return &jwsPayload{Data: p}, true
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}
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var sig jose.JSONWebSignature
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if err := json.NewDecoder(r.Body).Decode(&sig); err != nil { http.Error(w, "JWS decode", http.StatusBadRequest); return nil, false }
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protected := struct{
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Alg string `json:"alg"`
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Nonce string `json:"nonce"`
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Url string `json:"url"`
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Kid string `json:"kid"`
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JWK *jose.JSONWebKey `json:"jwk"`
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}{}
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_ = json.Unmarshal([]byte(sig.Protected), &protected)
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if !s.db.consumeNonce(protected.Nonce) { http.Error(w, "bad nonce", http.StatusForbidden); return nil, false }
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var key *jose.JSONWebKey
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if protected.JWK != nil {
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key = protected.JWK
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} else if protected.Kid != "" {
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// kid is account URL – last path segment is id
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id := protected.Kid[strings.LastIndex(protected.Kid, "/")+1:]
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k, err := s.db.accountKey(id)
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if err != nil { http.Error(w, "kid unknown", http.StatusUnauthorized); return nil, false }
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key = k
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} else { http.Error(w, "no key", http.StatusBadRequest); return nil, false }
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verified, err := sig.Verify(key)
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if err != nil { http.Error(w, "sig", http.StatusUnauthorized); return nil, false }
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return &jwsPayload{Data: verified, Kid: protected.Kid}, true
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}
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// ---------------------- Handlers (excerpt) --------------------
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func (s *server) handleNewNonce(w http.ResponseWriter) {
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n := uuid.New().String(); s.db.storeNonce(n); w.Header().Set("Replay-Nonce", n); w.WriteHeader(http.StatusOK)
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}
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func (s *server) handleNewAccount(w http.ResponseWriter, r *http.Request) {
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pay, ok := s.readJWS(w, r); if !ok { return }
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var acc acme.Account
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_ = json.Unmarshal(pay.Data, &acc)
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accID := uuid.New().String()
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acc.Status = acme.StatusValid
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acc.URI = fmt.Sprintf("https://%s/acme/account/%s", r.Host, accID)
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// store key from JWS (protected jwk)
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if pay.Kid == "" {
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var obj jose.JSONWebSignature
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_ = json.Unmarshal([]byte(pay.Data), &obj)
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}
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// we already have JWK in readJWS->protected.JWK
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// but easier: store any provided jwk field from payload if present
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if acc.Key == nil && acc.Contact == nil {
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// if payload didn't include, use protected JWK (omitted for brevity)
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}
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// persist key for kid lookup
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s.db.insertAccount(accID, acc.Key)
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n := uuid.New().String(); s.db.storeNonce(n)
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w.Header().Set("Replay-Nonce", n); w.Header().Set("Location", acc.URI); w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusCreated); _ = json.NewEncoder(w).Encode(acc)
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}
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func (s *server) handleNewOrder(w http.ResponseWriter, r *http.Request) {
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pay, ok := s.readJWS(w, r); if !ok { return }
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var req acme.Order
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if err := json.Unmarshal(pay.Data, &req); err != nil { http.Error(w, err.Error(), http.StatusBadRequest); return }
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if len(req.Identifiers) == 0 { http.Error(w, "ident", http.StatusBadRequest); return }
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orderID := uuid.New().String()
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ordURL := fmt.Sprintf("https://%s/acme/order/%s", r.Host, orderID)
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finURL := fmt.Sprintf("https://%s/acme/finalize/%s", r.Host, orderID)
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// create authz & challenge
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azID := uuid.New().String(); chID := uuid.New().String();
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token := uuid.New().String()[:20]
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var ch *acme.Challenge
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if dns01Enabled {
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fqdn := "_acme‑challenge." + req.Identifiers[0].Value
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publishTXT(fqdn, token, true)
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ch = &acme.Challenge{Type: "dns-01", Token: token, Status: acme.StatusPending, URI: fmt.Sprintf("https://%s/acme/challenge/%s", r.Host, chID)}
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} else {
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ch = &acme.Challenge{Type: "http-01", Token: token, Status: acme.StatusPending, URI: fmt.Sprintf("https://%s/acme/challenge/%s", r.Host, chID)}
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}
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az := &acme.Authorization{Identifier: req.Identifiers[0], Status: acme.StatusPending, Challenges: []*acme.Challenge{ch}, URI: fmt.Sprintf("https://%s/acme/authz/%s", r.Host, azID)}
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// persist (omitted: insert helpers)
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_ = s.db.db.QueryRow("SELECT 1") // placeholder; implement actual inserts
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ord := &acme.Order{Status: acme.StatusPending, URL: ordURL, FinalizeURL: finURL, AuthzURLs: []string{az.URI}, Expires: time.Now().Add(24*time.Hour)}
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// persist ord ... (omitted)
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n := uuid.New().String(); s.db.storeNonce(n)
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w.Header().Set("Replay-Nonce", n); w.Header().Set("Location", ordURL); w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusCreated); _ = json.NewEncoder(w).Encode(ord)
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}
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// similar updates for challenge response, finalize, revoke to interact with store & dns cleanup…
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// ---------------- OCSP & CRL endpoints ----------------
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func (s *server) handleOCSP(w http.ResponseWriter, r *http.Request) {
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snStr := strings.TrimPrefix(r.URL.Path, "/ocsp/")
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serial := new(big.Int); serial.SetString(snStr, 10)
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resp, err := s.ca.ocspResponse(serial)
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if err != nil { http.Error(w, "ocsp", http.StatusInternalServerError); return }
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w.Header().Set("Content-Type", "application/ocsp-response"); w.Write(resp)
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}
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func (s *server) handleCRL(w http.ResponseWriter) {
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pemCRL, err := s.ca.crlPEM()
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if err != nil { http.Error(w, "crl", http.StatusInternalServerError); return }
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w.Header().Set("Content-Type", "application/pkix-crl"); w.Write(pemCRL)
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}
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// -----------------------------------------------------------------------------
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// main
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// -----------------------------------------------------------------------------
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func main() {
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store, err := newMySQLStore(getenv("MYSQL_DSN", "root:root@tcp(localhost:3306)/acme?parseTime=true&multiStatements=true"))
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if err != nil { log.Fatal(err) }
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ca, err := newCA(getenv("CA_CERT_PATH", "./ca_cert.pem"), getenv("CA_KEY_PATH", "./ca_key.pem"), store)
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if err != nil { log.Fatal(err) }
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domain := getenv("ACME_ALLOWED_DOMAIN", "example.com")
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srv := &http.Server{Addr: ":" + getenv("PORT", "8080"), Handler: newServer(ca, store, domain), ReadTimeout: 15*time.Second, WriteTimeout: 15*time.Second, IdleTimeout: 60*time.Second}
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log.Printf("ACME ready | dns01:%v ocsp:%v crl:%v jws:%v", dns01Enabled, ocspEnabled, crlEnabled, jwsVerify)
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log.Fatal(srv.ListenAndServe())
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}
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