1 files changed, 25 insertions, 0 deletions

diff --git a/util/util.go b/util/util.go
new file mode 100644
index 0000000..f3845c9
--- /dev/null
+++ b/util/util.go
@@ -0,0 +1,25 @@
+package util
+
+import (
+        "errors"
+        "strconv"
+
+        "github.com/julienschmidt/httprouter"
+)
+
+func ParseNumberFromParams(name string, p httprouter.Params, unsigned bool) (int, error) {
+        snum := p.ByName(name)
+        num, err := strconv.Atoi(snum)
+        if err != nil {
+                return 0, err
+        }
+
+        if unsigned && num < 0 {
+                return 0, errors.New("number is negative")
+        }
+        return num, err
+}
+
+func ParseIDFromParams(p httprouter.Params) (int, error) {
+        return ParseNumberFromParams("id", p, true)
+}