From 82402749e6edecc46d06c06b867fe39b8a3968d6 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Sun, 26 Jan 2020 18:42:04 +0100
Subject: First ACL implementation

---
 util.go | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 util.go

(limited to 'util.go')

diff --git a/util.go b/util.go
new file mode 100644
index 0000000..30f9681
--- /dev/null
+++ b/util.go
@@ -0,0 +1,103 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"strings"
+
+	consul "github.com/hashicorp/consul/api"
+)
+
+func dnToConsul(dn string) (string, error) {
+	if strings.Contains(dn, "/") {
+		return "", fmt.Errorf("DN %s contains a /", dn)
+	}
+
+	rdns := strings.Split(dn, ",")
+
+	// Reverse rdns
+	for i, j := 0, len(rdns)-1; i < j; i, j = i+1, j-1 {
+		rdns[i], rdns[j] = rdns[j], rdns[i]
+	}
+
+	return strings.Join(rdns, "/"), nil
+}
+
+func consulToDN(key string) (string, string) {
+	path := strings.Split(key, "/")
+	dn := ""
+	for _, cpath := range path {
+		if cpath == "" {
+			continue
+		}
+		kv := strings.Split(cpath, "=")
+		if len(kv) == 2 && kv[0] == "attribute" {
+			return dn, kv[1]
+		}
+		if dn != "" {
+			dn = "," + dn
+		}
+		dn = cpath + dn
+	}
+	log.Printf("Consul key %s does not end with attribute=something", key)
+	panic("TODO don't panic handle this")
+}
+
+func parseValue(value []byte) ([]string, error) {
+	val := []string{}
+	err := json.Unmarshal(value, &val)
+	if err == nil {
+		return val, nil
+	}
+
+	val2 := ""
+	err = json.Unmarshal(value, &val2)
+	if err == nil {
+		return []string{val2}, nil
+	}
+
+	return nil, fmt.Errorf("Not a string or list of strings: %s", value)
+}
+
+func parseConsulResult(data []*consul.KVPair) (map[string]Entry, error) {
+	aggregator := map[string]Entry{}
+
+	for _, kv := range data {
+		log.Printf("(parseConsulResult) %s %s", kv.Key, string(kv.Value))
+		dn, attr := consulToDN(kv.Key)
+		if _, exists := aggregator[dn]; !exists {
+			aggregator[dn] = Entry{}
+		}
+		value, err := parseValue(kv.Value)
+		if err != nil {
+			return nil, err
+		}
+		aggregator[dn][attr] = value
+	}
+
+	return aggregator, nil
+}
+
+type DNComponent struct {
+	Type  string
+	Value string
+}
+
+func parseDN(dn string) ([]DNComponent, error) {
+	rdns := strings.Split(dn, ",")
+
+	ret := []DNComponent{}
+
+	for _, rdn := range rdns {
+		splits := strings.Split(rdn, "=")
+		if len(splits) != 2 {
+			return nil, fmt.Errorf("Wrong DN component: %s (expected type=value)", rdn)
+		}
+		ret = append(ret, DNComponent{
+			Type:  splits[0],
+			Value: splits[1],
+		})
+	}
+	return ret, nil
+}
-- 
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