refactor: move request param extractors to utils

utils/request_helpers.go

@@ -0,0 +1,72 @@
+package utils
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func ParamString(r *http.Request, param string) string {
+	return r.URL.Query().Get(param)
+}
+
+func ParamStrings(r *http.Request, param string) []string {
+	return r.URL.Query()[param]
+}
+
+func ParamTimes(r *http.Request, param string) []time.Time {
+	pStr := ParamStrings(r, param)
+	times := make([]time.Time, len(pStr))
+	for i, t := range pStr {
+		ti, err := strconv.ParseInt(t, 10, 64)
+		if err == nil {
+			times[i] = ToTime(ti)
+		}
+	}
+	return times
+}
+
+func ParamTime(r *http.Request, param string, def time.Time) time.Time {
+	v := ParamString(r, param)
+	if v == "" {
+		return def
+	}
+	value, err := strconv.ParseInt(v, 10, 64)
+	if err != nil {
+		return def
+	}
+	return ToTime(value)
+}
+
+func ParamInt(r *http.Request, param string, def int) int {
+	v := ParamString(r, param)
+	if v == "" {
+		return def
+	}
+	value, err := strconv.ParseInt(v, 10, 32)
+	if err != nil {
+		return def
+	}
+	return int(value)
+}
+
+func ParamInts(r *http.Request, param string) []int {
+	pStr := ParamStrings(r, param)
+	ints := make([]int, 0, len(pStr))
+	for _, s := range pStr {
+		i, err := strconv.ParseInt(s, 10, 32)
+		if err == nil {
+			ints = append(ints, int(i))
+		}
+	}
+	return ints
+}
+
+func ParamBool(r *http.Request, param string, def bool) bool {
+	p := ParamString(r, param)
+	if p == "" {
+		return def
+	}
+	return strings.Index("/true/on/1/", "/"+p+"/") != -1
+}