From ad44f8d1eb7aa5cde5d3baced15c0bcbba799384 Mon Sep 17 00:00:00 2001
From: Sonja Happ <sonja.happ@eonerc.rwth-aachen.de>
Date: Wed, 21 Apr 2021 14:16:23 +0200
Subject: [PATCH] read static scenario/group mapping from JSON file #61

---
 configuration/config.go   | 43 ++++++++++++++++++++++++++++++++++++---
 configuration/groups.json |  3 +++
 2 files changed, 43 insertions(+), 3 deletions(-)
 create mode 100644 configuration/groups.json

diff --git a/configuration/config.go b/configuration/config.go
index aaaa4e0..f3a537b 100644
--- a/configuration/config.go
+++ b/configuration/config.go
@@ -22,7 +22,10 @@
 package configuration
 
 import (
+	"encoding/json"
 	"flag"
+	"fmt"
+	"io/ioutil"
 	"log"
 	"os"
 	"strings"
@@ -33,9 +36,7 @@ import (
 // Global configuration
 var GlobalConfig *config.Config = nil
 
-var ScenarioGroupMap = map[string][]int{
-	"moodle-l2pmanager@13306": {1, 2, 3},
-}
+var ScenarioGroupMap = map[string][]int{}
 
 func InitConfig() error {
 	if GlobalConfig != nil {
@@ -73,6 +74,7 @@ func InitConfig() error {
 		contactName              = flag.String("contact-name", "Steffen Vogel", "Name of the administrative contact")
 		contactMail              = flag.String("contact-mail", "svogel2@eonerc.rwth-aachen.de", "EMail of the administrative contact")
 		testDataPath             = flag.String("test-data-path", "database/testdata.json", "The path to the test data json file (used in test mode)")
+		groupsPath               = flag.String("groups-path", "configuration/groups.json", "The path to the JSON file that maps user groups to scenario IDs")
 	)
 	flag.Parse()
 
@@ -103,6 +105,7 @@ func InitConfig() error {
 		"contact.name":                *contactName,
 		"contact.mail":                *contactMail,
 		"test.datapath":               *testDataPath,
+		"groups.path":                 *groupsPath,
 	}
 
 	if *s3NoSSL == true {
@@ -162,5 +165,39 @@ func InitConfig() error {
 		}
 	}
 
+	gPath, err := GlobalConfig.String("groups.path")
+	if err != nil {
+		return err
+	}
+
+	if gPath != "" {
+		err = readGroupsFile(gPath)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func readGroupsFile(path string) error {
+
+	jsonFile, err := os.Open(path)
+	if err != nil {
+		return fmt.Errorf("error opening json file for groups: %v", err)
+	}
+	log.Println("Successfully opened json groups file", path)
+
+	defer jsonFile.Close()
+
+	byteValue, _ := ioutil.ReadAll(jsonFile)
+
+	err = json.Unmarshal(byteValue, &ScenarioGroupMap)
+	if err != nil {
+		return fmt.Errorf("error unmarshalling json into ScenarioGroupMap: %v", err)
+	}
+
+	log.Println("ScenarioGroupMap", ScenarioGroupMap)
+
 	return nil
 }
diff --git a/configuration/groups.json b/configuration/groups.json
new file mode 100644
index 0000000..e3f3c80
--- /dev/null
+++ b/configuration/groups.json
@@ -0,0 +1,3 @@
+{
+  "moodle-l2pmanager@13306": [1, 2, 3]
+}
\ No newline at end of file