Avoid double-unescaping of form value (go-gitea#26853)

1. The old `prepareQueryArg` did double-unescaping of form value.
2. By the way, remove the unnecessary `ctx.Flash = ...` in `MockContext`.

modules/context/utils.go

@@ -4,37 +4,27 @@
 package context
 
 import (
-	"net/url"
 	"strings"
 	"time"
 )
 
 // GetQueryBeforeSince return parsed time (unix format) from URL query's before and since
 func GetQueryBeforeSince(ctx *Base) (before, since int64, err error) {
-	qCreatedBefore, err := prepareQueryArg(ctx, "before")
+	before, err = parseFormTime(ctx, "before")
 	if err != nil {
 		return 0, 0, err
 	}
 
-	qCreatedSince, err := prepareQueryArg(ctx, "since")
-	if err != nil {
-		return 0, 0, err
-	}
-
-	before, err = parseTime(qCreatedBefore)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	since, err = parseTime(qCreatedSince)
+	since, err = parseFormTime(ctx, "since")
 	if err != nil {
 		return 0, 0, err
 	}
 	return before, since, nil
 }
 
 // parseTime parse time and return unix timestamp
-func parseTime(value string) (int64, error) {
+func parseFormTime(ctx *Base, name string) (int64, error) {
+	value := strings.TrimSpace(ctx.FormString(name))
 	if len(value) != 0 {
 		t, err := time.Parse(time.RFC3339, value)
 		if err != nil {
@@ -46,10 +36,3 @@ func parseTime(value string) (int64, error) {
 	}
 	return 0, nil
 }
-
-// prepareQueryArg unescape and trim a query arg
-func prepareQueryArg(ctx *Base, name string) (value string, err error) {
-	value, err = url.PathUnescape(ctx.FormString(name))
-	value = strings.TrimSpace(value)
-	return value, err
-}

tests/integration/api_issue_test.go

@@ -234,7 +234,7 @@ func TestAPISearchIssues(t *testing.T) {
 	DecodeJSON(t, resp, &apiIssues)
 	assert.Len(t, apiIssues, expectedIssueCount)
 
-	since := "2000-01-01T00%3A50%3A01%2B00%3A00" // 946687801
+	since := "2000-01-01T00:50:01+00:00" // 946687801
 	before := time.Unix(999307200, 0).Format(time.RFC3339)
 	query.Add("since", since)
 	query.Add("before", before)

tests/integration/issue_test.go

@@ -368,7 +368,7 @@ func TestSearchIssues(t *testing.T) {
 	DecodeJSON(t, resp, &apiIssues)
 	assert.Len(t, apiIssues, expectedIssueCount)
 
-	since := "2000-01-01T00%3A50%3A01%2B00%3A00" // 946687801
+	since := "2000-01-01T00:50:01+00:00" // 946687801
 	before := time.Unix(999307200, 0).Format(time.RFC3339)
 	query := url.Values{}
 	query.Add("since", since)