add a new internal hook to save ssh log (#15787)

* add a new internal hook to save ssh log

as title, when a ssh error ocure like #15785.
only when switch ``RUN_MODE`` to dev can we
found which error is ocure. But this way is
not a good idea for production envirment.

this changes try save ssh error mesage to the
log file like other log by a new internal hook.
I think it's usefull for find error message
in production envirment. Thanks.

Signed-off-by: a1012112796 <1012112796@qq.com>

* rename and fix nit

* Update modules/private/hook.go

Co-authored-by: silverwind <me@silverwind.io>

Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

modules/private/hook.go

@@ -5,6 +5,7 @@
 package private
 
 import (
+	"encoding/json"
 	"fmt"
 	"net/http"
 	"net/url"
@@ -57,6 +58,12 @@ type HookOptions struct {
 	IsDeployKey                     bool
 }
 
+// SSHLogOption ssh log options
+type SSHLogOption struct {
+	IsError bool
+	Message string
+}
+
 // HookPostReceiveResult represents an individual result from PostReceive
 type HookPostReceiveResult struct {
 	Results      []HookPostReceiveBranchResult
@@ -146,3 +153,27 @@ func SetDefaultBranch(ownerName, repoName, branch string) error {
 	}
 	return nil
 }
+
+// SSHLog sends ssh error log response
+func SSHLog(isErr bool, msg string) error {
+	reqURL := setting.LocalURL + "api/internal/ssh/log"
+	req := newInternalRequest(reqURL, "POST")
+	req = req.Header("Content-Type", "application/json")
+
+	jsonBytes, _ := json.Marshal(&SSHLogOption{
+		IsError: isErr,
+		Message: msg,
+	})
+	req.Body(jsonBytes)
+
+	req.SetTimeout(60*time.Second, 60*time.Second)
+	resp, err := req.Response()
+	if err != nil {
+		return fmt.Errorf("unable to contact gitea: %v", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("Error returned from gitea: %v", decodeJSONError(resp).Err)
+	}
+	return nil
+}