Make extra property in the signed textures response to be adjusted

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   which is compatible with [Mojang's endpoint](https://wiki.vg/Mojang_API#Username_-.3E_UUID_at_time) to exchange
   username to its UUID. It can be used with some load balancing software to increase throughput of Mojang's textures
   proxy by splitting the load across multiple servers with its own IPs.
+- Textures extra param is now can be configured via `TEXTURES_EXTRA_PARAM_NAME` and `TEXTURES_EXTRA_PARAM_VALUE`.
 
 - New StatsD metrics:
   - Counters:

README.md

@@ -129,6 +129,22 @@ docker-compose up -d app
         </td>
         <td><code>http://remote-provider.com/api/worker/mojang-uuid</code></td>
     </tr>
+    <tr>
+        <td>TEXTURES_EXTRA_PARAM_NAME</td>
+        <td>
+            Sets the name of the extra property in the
+            <a href="#get-texturessignedusername">signed textures</a> response.
+        </td>
+        <td><code>your-name</code></td>
+    </tr>
+    <tr>
+        <td>TEXTURES_EXTRA_PARAM_VALUE</td>
+        <td>
+            Sets the value of the extra property in the
+            <a href="#get-texturessignedusername">signed textures</a> response.
+        </td>
+        <td><code>your awesome joke!</code></td>
+    </tr>
 </tbody>
 </table>
 

cmd/serve.go

@@ -75,12 +75,14 @@ var serveCmd = &cobra.Command{
 		logger.Info("Mojang's textures queue is successfully initialized")
 
 		cfg := &http.Skinsystem{
-			ListenSpec:             fmt.Sprintf("%s:%d", viper.GetString("server.host"), viper.GetInt("server.port")),
-			SkinsRepo:              skinsRepo,
-			CapesRepo:              capesRepo,
-			MojangTexturesProvider: mojangTexturesProvider,
-			Logger:                 logger,
-			Auth:                   &auth.JwtAuth{Key: []byte(viper.GetString("chrly.secret"))},
+			ListenSpec:              fmt.Sprintf("%s:%d", viper.GetString("server.host"), viper.GetInt("server.port")),
+			SkinsRepo:               skinsRepo,
+			CapesRepo:               capesRepo,
+			MojangTexturesProvider:  mojangTexturesProvider,
+			Logger:                  logger,
+			Auth:                    &auth.JwtAuth{Key: []byte(viper.GetString("chrly.secret"))},
+			TexturesExtraParamName:  viper.GetString("textures.extra_param_name"),
+			TexturesExtraParamValue: viper.GetString("textures.extra_param_value"),
 		}
 
 		finishChan := make(chan bool)

http/skinsystem.go

@@ -87,7 +87,9 @@ type AuthChecker interface {
 }
 
 type Skinsystem struct {
-	ListenSpec string
+	ListenSpec              string
+	TexturesExtraParamName  string
+	TexturesExtraParamValue string
 
 	SkinsRepo              SkinsRepository
 	CapesRepo              CapesRepository
@@ -304,8 +306,8 @@ func (ctx *Skinsystem) SignedTextures(response http.ResponseWriter, request *htt
 	}
 
 	responseData.Props = append(responseData.Props, &mojang.Property{
-		Name:  "chrly",
-		Value: "how do you tame a horse in Minecraft?",
+		Name:  getStringOrDefault(ctx.TexturesExtraParamName, "chrly"),
+		Value: getStringOrDefault(ctx.TexturesExtraParamValue, "how do you tame a horse in Minecraft?"),
 	})
 
 	responseJson, _ := json.Marshal(responseData)
@@ -496,3 +498,11 @@ func findIdentity(repo SkinsRepository, identityId int, username string) (*model
 func parseUsername(username string) string {
 	return strings.TrimSuffix(username, ".png")
 }
+
+func getStringOrDefault(value string, def string) string {
+	if value != "" {
+		return value
+	}
+
+	return def
+}