Add support for remote validation services. (#185)

* Simple tool to test the remote validation

* Added remote validator support to provider.

* Added remote validation to aggregator.

* Calm golint

* Removed csaf_remote_validator tool as it was only for dev.

* Re-added csaf_remote_validator tool. Testing is not done.

* Embed the document entirely

* Include testing the remote validator in the Itests

* Change permission of the script

* Remove code for Itests

* As these will be done in another branch

Co-authored-by: Fadi Abbud <fadi.abbud@intevation.de>

cmd/csaf_remote_validator/main.go

@@ -0,0 +1,79 @@
+// This file is Free Software under the MIT License
+// without warranty, see README.md and LICENSES/MIT.txt for details.
+//
+// SPDX-License-Identifier: MIT
+//
+// SPDX-FileCopyrightText: 2022 German Federal Office for Information Security (BSI) <https://www.bsi.bund.de>
+// Software-Engineering: 2022 Intevation GmbH <https://intevation.de>
+
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/csaf-poc/csaf_distribution/csaf"
+)
+
+func loadJSONFromFile(fname string) (interface{}, error) {
+	f, err := os.Open(fname)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	var doc interface{}
+	err = json.NewDecoder(f).Decode(&doc)
+	return doc, err
+}
+
+func process(options *csaf.RemoteValidatorOptions, fnames []string) error {
+	validator, err := options.Open()
+	if err != nil {
+		return err
+	}
+	defer validator.Close()
+
+	for _, fname := range fnames {
+		doc, err := loadJSONFromFile(fname)
+		if err != nil {
+			return err
+		}
+		valid, err := validator.Validate(doc)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("%s: %t\n", fname, valid)
+	}
+	return nil
+}
+
+func main() {
+
+	var (
+		url     = flag.String("url", "", "URL to the validation service")
+		presets = flag.String("presets", "", "validation presets")
+		cache   = flag.String("cache", "", "cache")
+	)
+
+	flag.Parse()
+
+	var pres []string
+
+	if *presets != "" {
+		pres = strings.Split(*presets, ",")
+	}
+
+	options := csaf.RemoteValidatorOptions{
+		URL:     *url,
+		Presets: pres,
+		Cache:   *cache,
+	}
+
+	if err := process(&options, flag.Args()); err != nil {
+		log.Fatalf("error: %v\n", err)
+	}
+}