feat(api/cert): enhance certificate info retrieval

- Introduced a new method `GetCertInfos` to fetch details of all available certificates.
- Updated the `Info` handler to return an array of `CertInfo` instead of a single certificate.
- Improved error handling for cases with no available certificates.
- Refactored related error messages for clarity.

internal/api/v1/cert/info.go

@@ -1,6 +1,7 @@
 package certapi
 
 import (
+	"errors"
 	"net/http"
 
 	"github.com/gin-gonic/gin"
@@ -8,46 +9,33 @@ import (
 	apitypes "github.com/yusing/goutils/apitypes"
 )
 
-type CertInfo struct {
-	Subject        string   `json:"subject"`
-	Issuer         string   `json:"issuer"`
-	NotBefore      int64    `json:"not_before"`
-	NotAfter       int64    `json:"not_after"`
-	DNSNames       []string `json:"dns_names"`
-	EmailAddresses []string `json:"email_addresses"`
-} // @name CertInfo
-
 // @x-id				"info"
 // @BasePath		/api/v1
 // @Summary		Get cert info
 // @Description	Get cert info
 // @Tags			cert
 // @Produce		json
-// @Success		200	{object}	CertInfo
-// @Failure		403	{object}	apitypes.ErrorResponse
-// @Failure		404	{object}	apitypes.ErrorResponse
-// @Failure		500	{object}	apitypes.ErrorResponse
-// @Router			/cert/info [get]
+// @Success		200	{array}	  autocert.CertInfo
+// @Failure		403	{object}	apitypes.ErrorResponse "Unauthorized"
+// @Failure		404	{object}	apitypes.ErrorResponse "No certificates found or autocert is not enabled"
+// @Failure		500	{object}	apitypes.ErrorResponse "Internal server error"
+// @Router		/cert/info [get]
 func Info(c *gin.Context) {
-	autocert := autocert.ActiveProvider.Load()
-	if autocert == nil {
+	provider := autocert.ActiveProvider.Load()
+	if provider == nil {
 		c.JSON(http.StatusNotFound, apitypes.Error("autocert is not enabled"))
 		return
 	}
 
-	cert, err := autocert.GetCert(nil)
+	certInfos, err := provider.GetCertInfos()
 	if err != nil {
+		if errors.Is(err, autocert.ErrNoCertificates) {
+			c.JSON(http.StatusNotFound, apitypes.Error("no certificate found"))
+			return
+		}
 		c.Error(apitypes.InternalServerError(err, "failed to get cert info"))
 		return
 	}
 
-	certInfo := CertInfo{
-		Subject:        cert.Leaf.Subject.CommonName,
-		Issuer:         cert.Leaf.Issuer.CommonName,
-		NotBefore:      cert.Leaf.NotBefore.Unix(),
-		NotAfter:       cert.Leaf.NotAfter.Unix(),
-		DNSNames:       cert.Leaf.DNSNames,
-		EmailAddresses: cert.Leaf.EmailAddresses,
-	}
-	c.JSON(http.StatusOK, certInfo)
+	c.JSON(http.StatusOK, certInfos)
 }

internal/api/v1/docs/swagger.json

@@ -328,23 +328,26 @@
           "200": {
             "description": "OK",
             "schema": {
-              "$ref": "#/definitions/CertInfo"
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/CertInfo"
+              }
             }
           },
           "403": {
-            "description": "Forbidden",
+            "description": "Unauthorized",
             "schema": {
               "$ref": "#/definitions/ErrorResponse"
             }
           },
           "404": {
-            "description": "Not Found",
+            "description": "No certificates found or autocert is not enabled",
             "schema": {
               "$ref": "#/definitions/ErrorResponse"
             }
           },
           "500": {
-            "description": "Internal Server Error",
+            "description": "Internal server error",
             "schema": {
               "$ref": "#/definitions/ErrorResponse"
             }

internal/api/v1/docs/swagger.yaml

@@ -1886,17 +1886,19 @@ paths:
         "200":
           description: OK
           schema:
-            $ref: '#/definitions/CertInfo'
+            items:
+              $ref: '#/definitions/CertInfo'
+            type: array
         "403":
-          description: Forbidden
+          description: Unauthorized
           schema:
             $ref: '#/definitions/ErrorResponse'
         "404":
-          description: Not Found
+          description: No certificates found or autocert is not enabled
           schema:
             $ref: '#/definitions/ErrorResponse'
         "500":
-          description: Internal Server Error
+          description: Internal server error
           schema:
             $ref: '#/definitions/ErrorResponse'
       summary: Get cert info