feat: add new hook option keep-file-environment

docs/Hook-Definition.md

@@ -23,6 +23,7 @@ Hooks are defined as objects in the JSON or YAML hooks configuration file. Pleas
  * `trigger-rule` - specifies the rule that will be evaluated in order to determine should the hook be triggered. Check [Hook rules page](Hook-Rules.md) to see the list of valid rules and their usage
  * `trigger-rule-mismatch-http-response-code` - specifies the HTTP status code to be returned when the trigger rule is not satisfied
  * `trigger-signature-soft-failures` - allow signature validation failures within Or rules; by default, signature failures are treated as errors.
+* `keep-file-environment` - Keep all submitted files. Sending `curl -d 'pkg=@res.tar.gz'` will retrieve the environment variable `HOOK_FILE_PKG`, which contains the file path, and `HOOK_FILENAME_PKG`, which contains the file name as `res.tar.gz`. If `keep-file-environment` is true, the file will be preserved after the hook is executed. By default, the corresponding file will be removed after the webhook exits.
 
 ## Examples
 Check out [Hook examples page](Hook-Examples.md) for more complex examples of hooks.

internal/hook/hook.go

@@ -581,6 +581,7 @@ type Hook struct {
 	IncomingPayloadContentType          string          `json:"incoming-payload-content-type,omitempty"`
 	SuccessHttpResponseCode             int             `json:"success-http-response-code,omitempty"`
 	HTTPMethods                         []string        `json:"http-methods"`
+	KeepFileEnvironment                 bool            `json:"keep-file-environment,omitempty"`
 }
 
 // ParseJSONParameters decodes specified arguments to JSON objects and replaces the

webhook.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"log"
 	"net"
@@ -615,6 +616,52 @@ func handleHook(h *hook.Hook, r *hook.Request) (string, error) {
 		envs = append(envs, files[i].EnvName+"="+tmpfile.Name())
 	}
 
+	if h.KeepFileEnvironment && r.RawRequest != nil && r.RawRequest.MultipartForm != nil {
+		for k, v := range r.RawRequest.MultipartForm.File {
+			env_name := hook.EnvNamespace + "FILE_" + strings.ToUpper(k)
+			f, err := v[0].Open()
+			if err != nil {
+				log.Printf("[%s] error open form %s file [%s]", r.ID, k, err)
+				continue
+			}
+			if f1, ok := f.(*os.File); ok {
+				log.Printf("[%s] temporary file %s", r.ID, f1.Name())
+				_ = f1.Close()
+				files = append(files, hook.FileParameter{File: f1, EnvName: env_name})
+				envs = append(envs,
+					env_name+"="+f1.Name(),
+					hook.EnvNamespace+"FILENAME_"+strings.ToUpper(k)+"="+v[0].Filename,
+				)
+				continue
+			}
+			tmpfile, err := os.CreateTemp("", ".hook-"+r.ID+"-"+k+"-*")
+			if err != nil {
+				_ = f.Close()
+				log.Printf("[%s] error creating temp file [%s]", r.ID, err)
+				continue
+			}
+			log.Printf("[%s] writing env %s file %s", r.ID, env_name, tmpfile.Name())
+			if _, err = io.Copy(tmpfile, f); err != nil {
+				log.Printf("[%s] error writing file %s [%s]", r.ID, tmpfile.Name(), err)
+				_ = f.Close()
+				_ = tmpfile.Close()
+				_ = os.Remove(tmpfile.Name())
+				continue
+			}
+			if err := tmpfile.Close(); err != nil {
+				log.Printf("[%s] error closing file %s [%s]", r.ID, tmpfile.Name(), err)
+				_ = os.Remove(tmpfile.Name())
+				continue
+			}
+			_ = f.Close()
+			files = append(files, hook.FileParameter{File: tmpfile, EnvName: env_name})
+			envs = append(envs,
+				env_name+"="+tmpfile.Name(),
+				hook.EnvNamespace+"FILENAME_"+strings.ToUpper(k)+"="+v[0].Filename,
+			)
+		}
+	}
+
 	cmd.Env = append(os.Environ(), envs...)
 
 	log.Printf("[%s] executing %s (%s) with arguments %q and environment %s using %s as cwd\n", r.ID, h.ExecuteCommand, cmd.Path, cmd.Args, envs, cmd.Dir)