WebClient: remove the default upload size limit

Users who want a limit can still set it.
By default, we want to allow uploads of any size

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

docs/full-configuration.md

@@ -362,7 +362,7 @@ The configuration file contains the following sections:
   - `ca_revocation_lists`, list of strings. Set a revocation lists, one for each root CA, to be used to check if a client certificate has been revoked. The revocation lists can be reloaded on demand sending a `SIGHUP` signal on Unix based systems and a `paramchange` request to the running service on Windows.
   - `signing_passphrase`, string. Passphrase to use to derive the signing key for JWT and CSRF tokens. If empty a random signing key will be generated each time SFTPGo starts. If you set a signing passphrase you should consider rotating it periodically for added security.
   - `token_validation`, integer. Define how to validate JWT tokens, cookies and CSRF tokens. By default all the available security checks are enabled. Set to 1 to disable the requirement that a token must be used by the same IP for which it was issued. Default: `0`.
-  - `max_upload_file_size`, integer. Defines the maximum request body size, in bytes, for Web Client/API HTTP upload requests. 0 means no limit. Default: 1048576000.
+  - `max_upload_file_size`, integer. Defines the maximum request body size, in bytes, for Web Client/API HTTP upload requests. `0` means no limit. Default: `0`.
   - `cors` struct containing CORS configuration. SFTPGo uses [Go CORS handler](https://github.com/rs/cors), please refer to upstream documentation for fields meaning and their default values.
     - `enabled`, boolean, set to `true` to enable CORS.
     - `allowed_origins`, list of strings.

internal/config/config.go

@@ -386,7 +386,7 @@ func Init() {
 			CARevocationLists:  nil,
 			SigningPassphrase:  "",
 			TokenValidation:    0,
-			MaxUploadFileSize:  1048576000,
+			MaxUploadFileSize:  0,
 			Cors: httpd.CorsConfig{
 				Enabled:              false,
 				AllowedOrigins:       []string{},

internal/httpd/httpd_test.go

@@ -313,6 +313,7 @@ func TestMain(m *testing.M) {
 	os.Setenv("SFTPGO_DEFAULT_ADMIN_PASSWORD", "password")
 	os.Setenv("SFTPGO_HTTPD__BINDINGS__0__WEB_CLIENT_INTEGRATIONS__0__URL", "http://127.0.0.1/test.html")
 	os.Setenv("SFTPGO_HTTPD__BINDINGS__0__WEB_CLIENT_INTEGRATIONS__0__FILE_EXTENSIONS", ".pdf,.txt")
+	os.Setenv("SFTPGO_HTTPD__MAX_UPLOAD_FILE_SIZE", "1048576000")
 	err := config.LoadConfig(configDir, "")
 	if err != nil {
 		logger.WarnToConsole("error loading configuration: %v", err)

sftpgo.json

@@ -336,7 +336,7 @@
     "ca_revocation_lists": [],
     "signing_passphrase": "",
     "token_validation": 0,
-    "max_upload_file_size": 1048576000,
+    "max_upload_file_size": 0,
     "cors": {
       "enabled": false,
       "allowed_origins": [],