Generate JSON schema of Flogo app descriptor (flogo.json)

Author: debovema

.gitignore

@@ -44,6 +44,7 @@ _testmain.go
 .vscode/
 tags
 .vscode/symbols.json
+.idea
 .build-cache
 submodules/flogo-cicd/.build-cache
 ./Dockerfile

go.mod

@@ -1,6 +1,7 @@
 module github.com/project-flogo/core
 
 require (
+	github.com/square-it/jsonschema v1.9.1 // indirect
 	github.com/stretchr/testify v1.2.2
 	go.uber.org/atomic v1.3.2 // indirect
 	go.uber.org/multierr v1.1.0 // indirect

go.sum

@@ -10,6 +10,8 @@ github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/project-flogo/core v0.9.0-alpha.3/go.mod h1:BHeB55AxPhvlNGd+it50rE977ag6xE3bD2RluSDeKBA=
+github.com/square-it/jsonschema v1.9.1 h1:0pYdNW+bvukTIBqcfal5XXHikgp/AbADeqcP7I0uV4M=
+github.com/square-it/jsonschema v1.9.1/go.mod h1:80WJHSuy3YnokzfFopfx+MAt5lVVnVpS6w2Avv+svHk=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

internal/schema/assets.go

@@ -0,0 +1,28 @@
+// +build ignore
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/square-it/jsonschema"
+	"github.com/project-flogo/core/app"
+)
+
+func main() {
+	reflector := &jsonschema.Reflector{ExpandedStruct: true}
+	schema := reflector.Reflect(&app.Config{})
+	schemaJSON, err := json.MarshalIndent(schema, "", "    ")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+	err = ioutil.WriteFile("schema.json", schemaJSON, 0644)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+}

internal/schema/generate/schema_generator.go

@@ -0,0 +1,47 @@
+//go:generate go run generate/schema_generator.go
+//go:generate go-bindata -pkg schema -o assets.go schema.json
+
+package schema
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+
+	"github.com/xeipuuv/gojsonschema"
+)
+
+var schema *gojsonschema.Schema
+
+func init() {
+	jsonSchema, err := Asset("schema.json")
+	if err != nil {
+		panic(err)
+	}
+	schemaLoader := gojsonschema.NewStringLoader(string(jsonSchema))
+	schema, err = gojsonschema.NewSchema(schemaLoader)
+	if err != nil {
+		panic(err)
+	}
+}
+
+// Validate validates the provided JSON against the v2 JSON schema.
+func Validate(JSON []byte) error {
+	JSONLoader := gojsonschema.NewStringLoader(string(JSON))
+	result, err := schema.Validate(JSONLoader)
+
+	if err != nil {
+		return err
+	}
+
+	if result.Valid() {
+		return err
+	}
+	var msg bytes.Buffer
+
+	msg.WriteString("The JSON is not valid. See errors:\n")
+	for _, desc := range result.Errors() {
+		msg.WriteString(fmt.Sprintf("- %s\n", desc))
+	}
+	return errors.New(msg.String())
+}