sparkles: Web UI schema validations (#934)

* Allow validator to receive a config-schema

It will try to process a URL first, otherwise a file and if the file
is not present it will try to read the source as a cloud-config

Signed-off-by: Mauro Morales <mauro.morales@spectrocloud.com>

* Validate cloud-config on WebUI

Signed-off-by: Mauro Morales <mauro.morales@spectrocloud.com>

---------

Signed-off-by: Mauro Morales <mauro.morales@spectrocloud.com>

internal/agent/validate.go

@@ -23,11 +23,11 @@ func JSONSchema(version string) (string, error) {
 }
 
 // Validate ensures that a given schema is Valid according to the Root Schema from the agent.
-func Validate(file string) error {
+func Validate(source string) error {
 	var yaml string
 
-	if strings.HasPrefix(file, "http") {
-		resp, err := http.Get(file)
+	if strings.HasPrefix(source, "http") {
+		resp, err := http.Get(source)
 		if err != nil {
 			return err
 		}
@@ -38,12 +38,17 @@ func Validate(file string) error {
 		//Convert the body to type string
 		yaml = string(body)
 	} else {
-		dat, err := os.ReadFile(file)
+		dat, err := os.ReadFile(source)
 		if err != nil {
+			if strings.Contains(err.Error(), "no such file or directory") {
+				yaml = source
+			} else {
 				return err
 			}
+		} else {
 			yaml = string(dat)
 		}
+	}
 
 	config, err := schema.NewConfigFromYAML(yaml, schema.RootSchema{})
 	if err != nil {

internal/webui/public/index.html

@@ -69,7 +69,22 @@
                   try {
                     // Parse the YAML
                     const yaml = YAML.parse(this.content);
+                    const formData = new FormData()
+                    formData.append('cloud-config', this.content)
+                    const settings = {
+                        method: 'POST',
+                        body: formData,
+                    };
+                    fetch(`/validate`, settings)
+                      .then((response) => response.text())
+                      .then((text) => {
+                        if (text === '') {
                           this.valid = true
+                        } else {
+                          this.error = text
+                          this.valid = false
+                        }
+                      })
                   } catch(error) {
                     this.error = error
                     this.valid = false

internal/webui/webui.go

@@ -161,6 +161,21 @@ func Start(ctx context.Context) error {
 
 	ec.GET("/*", echo.WrapHandler(http.StripPrefix("/", assetHandler)))
 
+	ec.POST("/validate", func(c echo.Context) error {
+		formData := new(FormData)
+		if err := c.Bind(formData); err != nil {
+			return err
+		}
+		cloudConfig := formData.CloudConfig
+
+		err := agent.Validate(cloudConfig)
+		if err != nil {
+			return c.String(http.StatusOK, err.Error())
+		}
+
+		return c.String(http.StatusOK, "")
+	})
+
 	ec.POST("/install", func(c echo.Context) error {
 
 		s.Lock()