Added initial release

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

main.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+
+	"github.com/civo/civogo"
+)
+
+var (
+	client *civogo.Client
+	port   string
+)
+
+type ReleaseTemplate struct {
+	Releases []civogo.KubernetesVersion `json:"releases"`
+}
+
+func init() {
+	var err error
+
+	apiKey, ok := os.LookupEnv("API_KEY")
+	if !ok {
+		panic("API_KEY env var must be provided")
+	}
+
+	regionCode, ok := os.LookupEnv("REGION")
+	if !ok {
+		regionCode = "LON1"
+	}
+
+	client, err = civogo.NewClient(apiKey, regionCode)
+	if err != nil {
+		panic(err)
+	}
+
+	if p, ok := os.LookupEnv("PORT"); !ok {
+		port = ":8000"
+	} else {
+		port = fmt.Sprintf(":%s", p)
+	}
+}
+
+func main() {
+	http.HandleFunc("/", handler("", ""))
+	http.HandleFunc("/k3s/", handler("k3s", ""))
+	http.HandleFunc("/k3s/stable", handler("k3s", "stable"))
+	http.HandleFunc("/k3s/development", handler("k3s", "development"))
+	http.HandleFunc("/talos/", handler("talos", ""))
+	http.HandleFunc("/talos/stable", handler("talos", "stable"))
+	http.HandleFunc("/talos/development", handler("talos", "development"))
+
+	http.ListenAndServe(port, nil)
+}
+
+func handler(clusterType, versionType string) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		versions, err := getVersions(clusterType, versionType)
+		if err != nil {
+			w.WriteHeader(500)
+			return
+		}
+		b, err := json.Marshal(versions)
+		if err != nil {
+			w.WriteHeader(500)
+			return
+		}
+
+		w.Header().Add("Content-Type", "application/json")
+		w.Write(b)
+	}
+}
+
+func getVersions(clusterType string, versionType string) (ReleaseTemplate, error) {
+	releases := ReleaseTemplate{
+		Releases: []civogo.KubernetesVersion{},
+	}
+
+	allVersions, err := client.ListAvailableKubernetesVersions()
+	if err != nil {
+		return releases, err
+	}
+
+	for _, v := range allVersions {
+		if v.Type != "deprecated" &&
+			(versionType == "" || v.Type == versionType) &&
+			(clusterType == "" || v.ClusterType == clusterType) {
+			releases.Releases = append(releases.Releases, v)
+		}
+	}
+
+	return releases, nil
+}