s3 api: get publish root list

api/router.go

@@ -140,6 +140,10 @@ func Router(c *ctx.AptlyContext) http.Handler {
 		api.POST("/gpg/key", apiGPGAddKey)
 	}
 
+	{
+		api.GET("/s3", apiS3List)
+	}
+
 	{
 		api.GET("/files", apiFilesListDirs)
 		api.POST("/files/:dir", apiFilesUpload)

api/s3.go

@@ -0,0 +1,14 @@
+package api
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+// GET /api/s3
+func apiS3List(c *gin.Context) {
+	keys := []string{}
+	for k := range context.Config().S3PublishRoots {
+		keys = append(keys, k)
+	}
+	c.JSON(200, keys)
+}