WeKnora deployment source with the reviewed wiki identity, summary and recovery fixes

internal/im/yunzhijia/sign.go

@@ -0,0 +1,32 @@
+package yunzhijia
+
+import (
+	"crypto/hmac"
+	"crypto/sha1"
+	"encoding/base64"
+	"fmt"
+	"strings"
+)
+
+// computeSignature builds the signature string from the callback fields
+// and returns the Base64(HMAC_SHA1(secret, signatureString)).
+//
+// The signature string is formed by joining the following fields in order
+// with commas: robotId, robotName, operatorOpenid, operatorName, time, msgId, content.
+func computeSignature(secret string, msg *callbackMessage) string {
+	// Build signature string: field1,field2,...,field7
+	parts := []string{
+		msg.RobotID,
+		msg.RobotName,
+		msg.OperatorOpenid,
+		msg.OperatorName,
+		fmt.Sprintf("%d", msg.Time),
+		msg.MsgID,
+		msg.Content,
+	}
+	signatureString := strings.Join(parts, ",")
+
+	mac := hmac.New(sha1.New, []byte(secret))
+	mac.Write([]byte(signatureString))
+	return base64.StdEncoding.EncodeToString(mac.Sum(nil))
+}