Add AddQueryParamToUrl function to strutil package

internal/util/strutil/add_query_param_to_url.go

@@ -0,0 +1,27 @@
+package strutil
+
+import (
+	"fmt"
+	nurl "net/url"
+	"strings"
+)
+
+func AddQueryParamToUrl(url, key, value string) string {
+	if url == "" {
+		return ""
+	}
+
+	if key == "" || value == "" {
+		return url
+	}
+
+	value = nurl.PathEscape(value)
+
+	if !strings.Contains(url, "?") {
+		return fmt.Sprintf("%s?%s=%s", url, key, value)
+	}
+	if strings.HasSuffix(url, "?") || strings.HasSuffix(url, "&") {
+		return fmt.Sprintf("%s%s=%s", url, key, value)
+	}
+	return fmt.Sprintf("%s&%s=%s", url, key, value)
+}

internal/util/strutil/add_query_param_to_url_test.go

@@ -0,0 +1,50 @@
+package strutil
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAddQueryParamToUrl(t *testing.T) {
+	assert := assert.New(t)
+
+	// Test case when url, key or value is empty
+	assert.Equal("", AddQueryParamToUrl("", "key", "value"))
+	assert.Equal("http://example.com", AddQueryParamToUrl("http://example.com", "", "value"))
+	assert.Equal("http://example.com", AddQueryParamToUrl("http://example.com", "key", ""))
+
+	// Test case when url does not contain "?"
+	assert.Equal("http://example.com?key=value", AddQueryParamToUrl("http://example.com", "key", "value"))
+
+	// Test case when url ends with "?"
+	assert.Equal("http://example.com?key=value", AddQueryParamToUrl("http://example.com?", "key", "value"))
+
+	// Test case when url ends with "&"
+	assert.Equal("http://example.com&?key=value", AddQueryParamToUrl("http://example.com&", "key", "value"))
+
+	// Test case when url contains "?" but does not end with "?" or "&"
+	assert.Equal("http://example.com/path?key=value", AddQueryParamToUrl("http://example.com/path?", "key", "value"))
+
+	// Test case when multiple query params are added
+	expected := "http://example.com/path?key1=value1&key2=value2"
+	got := AddQueryParamToUrl("http://example.com/path", "key1", "value1")
+	got = AddQueryParamToUrl(got, "key2", "value2")
+	assert.Equal(expected, got)
+
+	// Test case when value contains special characters
+	expected = "http://example.com/path?key1=value%20with%20spaces"
+	got = AddQueryParamToUrl("http://example.com/path", "key1", "value with spaces")
+	assert.Equal(expected, got)
+
+	// Test case when the key is empty
+	expected = "http://example.com/path"
+	got = AddQueryParamToUrl("http://example.com/path", "", "value")
+	assert.Equal(expected, got)
+
+	// Test case when the value is empty
+	expected = "http://example.com/path?key2=val2"
+	got = AddQueryParamToUrl("http://example.com/path", "key1", "")
+	got = AddQueryParamToUrl(got, "key2", "val2")
+	assert.Equal(expected, got)
+}