Show if a new version is available in the web interface

version/version.go

@@ -1,24 +1,47 @@
 package version
 
 import (
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
+	"net/http"
+	"time"
+
+	daulog "github.com/tardisx/discord-auto-upload/log"
 
 	"golang.org/x/mod/semver"
 )
 
-const CurrentVersion string = "v0.12.0"
+const CurrentVersion string = "v0.12.1"
 
-func NewVersionAvailable(v string) bool {
+type GithubRelease struct {
+	HTMLURL string `json:"html_url"`
+	TagName string `json:"tag_name"`
+	Name    string `json:"name"`
+	Body    string `json:"body"`
+}
+
+var LatestVersion string
+var LatestVersionInfo GithubRelease
+
+// UpdateAvailable returns true or false, depending on whether not a new version is available.
+// It always returns false if the OnlineVersion has not yet been fetched.
+func UpdateAvailable() bool {
 	if !semver.IsValid(CurrentVersion) {
 		panic(fmt.Sprintf("my current version '%s' is not valid", CurrentVersion))
 	}
-	if !semver.IsValid(v) {
-		// maybe this should just be a warning
-		log.Printf("passed in version '%s' is not valid - assuming no new version", v)
+
+	if LatestVersion == "" {
 		return false
 	}
-	comp := semver.Compare(v, CurrentVersion)
+
+	if !semver.IsValid(LatestVersion) {
+		// maybe this should just be a warning
+		log.Printf("online version '%s' is not valid - assuming no new version", LatestVersion)
+		return false
+	}
+	comp := semver.Compare(LatestVersion, CurrentVersion)
 	if comp == 0 {
 		return false
 	}
@@ -27,3 +50,38 @@ func NewVersionAvailable(v string) bool {
 	}
 	return false // they are using a newer one than exists?
 }
+
+func GetOnlineVersion() {
+
+	daulog.SendLog("checking for new version", daulog.LogTypeInfo)
+	LatestVersion = "v0.12.0"
+	LatestVersionInfo = GithubRelease{
+		HTMLURL: "https://github.com/tardisx/discord-auto-upload/releases/tag/v0.13.0",
+		TagName: "v0.13.0",
+		Name:    "v0.13.0",
+		Body:    "- cool things\n-wow things\n",
+	}
+	return
+
+	client := &http.Client{Timeout: time.Second * 5}
+	resp, err := client.Get("https://api.github.com/repos/tardisx/discord-auto-upload/releases/latest")
+	if err != nil {
+		daulog.SendLog(fmt.Sprintf("WARNING: Update check failed: %v", err), daulog.LogTypeError)
+		return
+	}
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatal("could not check read update response")
+	}
+
+	var latest GithubRelease
+	err = json.Unmarshal(body, &latest)
+
+	if err != nil {
+		log.Fatal("could not parse JSON: ", err)
+	}
+
+	LatestVersion = latest.TagName
+	LatestVersionInfo = latest
+}

version/version_test.go

@@ -4,8 +4,18 @@ import (
 	"testing"
 )
 
-func TestVersioning(t *testing.T) {
-	if !NewVersionAvailable("v1.0.0") {
-		t.Error("should be a version newer than v1.0.0")
+func TestVersioningUpdate(t *testing.T) {
+	// pretend there is a new version
+	LatestVersion = "v0.13.0"
+	if !UpdateAvailable() {
+		t.Error("should be a version newer than " + CurrentVersion)
+	}
+}
+
+func TestVersioningNoUpdate(t *testing.T) {
+	// pretend there is a new version
+	LatestVersion = "v0.12.1"
+	if UpdateAvailable() {
+		t.Error("should NOT be a version newer than " + CurrentVersion)
 	}
 }