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

internal/autocert/provider.go

@@ -55,10 +55,20 @@ type (
 	}
 
 	CertExpiries map[string]time.Time
-	RenewMode    uint8
+
+	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
+
+	RenewMode uint8
 )
 
-var ErrNoCertificate = errors.New("no certificate found")
+var ErrNoCertificates = errors.New("no certificates found")
 
 const (
 	// renew failed for whatever reason, 1 hour cooldown
@@ -98,7 +108,7 @@ func NewProvider(cfg *Config, user *User, legoCfg *lego.Config) (*Provider, erro
 
 func (p *Provider) GetCert(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
 	if p.tlsCert == nil {
-		return nil, ErrNoCertificate
+		return nil, ErrNoCertificates
 	}
 	if hello == nil || hello.ServerName == "" {
 		return p.tlsCert, nil
@@ -109,6 +119,29 @@ func (p *Provider) GetCert(hello *tls.ClientHelloInfo) (*tls.Certificate, error)
 	return p.tlsCert, nil
 }
 
+func (p *Provider) GetCertInfos() ([]CertInfo, error) {
+	allProviders := p.allProviders()
+	certInfos := make([]CertInfo, 0, len(allProviders))
+	for _, provider := range allProviders {
+		if provider.tlsCert == nil {
+			continue
+		}
+		certInfos = append(certInfos, CertInfo{
+			Subject:        provider.tlsCert.Leaf.Subject.CommonName,
+			Issuer:         provider.tlsCert.Leaf.Issuer.CommonName,
+			NotBefore:      provider.tlsCert.Leaf.NotBefore.Unix(),
+			NotAfter:       provider.tlsCert.Leaf.NotAfter.Unix(),
+			DNSNames:       provider.tlsCert.Leaf.DNSNames,
+			EmailAddresses: provider.tlsCert.Leaf.EmailAddresses,
+		})
+	}
+
+	if len(certInfos) == 0 {
+		return nil, ErrNoCertificates
+	}
+	return certInfos, nil
+}
+
 func (p *Provider) GetName() string {
 	if p.cfg.idx == 0 {
 		return "main"