added ssr code

api/hooks/lib/utils.js

@@ -0,0 +1,53 @@
+/**
+ *
+ * @param {any} str
+ */
+function log(str) {
+    console.log(JSON.stringify(str, undefined, 4))
+}
+
+/**
+ * convert object to string
+ * @param {any} obj object
+ */
+function obj2str(obj) {
+    if (Array.isArray(obj)) {
+        return JSON.stringify(
+            obj.map(function (idx) {
+                return obj2str(idx)
+            })
+        )
+    } else if (typeof obj === "object" && obj !== null) {
+        var elements = Object.keys(obj)
+            .sort()
+            .map(function (key) {
+                var val = obj2str(obj[key])
+                if (val) {
+                    return key + ":" + val
+                }
+            })
+
+        var elementsCleaned = []
+        for (var i = 0; i < elements.length; i++) {
+            if (elements[i]) elementsCleaned.push(elements[i])
+        }
+
+        return "{" + elementsCleaned.join("|") + "}"
+    }
+
+    if (obj) return obj
+}
+
+/**
+ * clear SSR cache
+ */
+function clearSSRCache() {
+    var info = context.db.deleteMany("ssr", {})
+    context.response.header("X-SSR-Cleared", info.removed)
+}
+
+module.exports = {
+    log,
+    clearSSRCache,
+    obj2str,
+}