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internal/handlers/resource_text.go

@@ -0,0 +1,49 @@
+package handlers
+
+import (
+	"net/http"
+	"strings"
+)
+
+// SQL fragment: nine i18n text columns on resources.
+const resourceI18nColsSQL = `
+	COALESCE(r.title_zh_tw,''), COALESCE(r.title_zh_cn,''), COALESCE(r.title_en,''),
+	COALESCE(r.description_zh_tw,''), COALESCE(r.description_zh_cn,''), COALESCE(r.description_en,''),
+	COALESCE(r.body_text_zh_tw,''), COALESCE(r.body_text_zh_cn,''), COALESCE(r.body_text_en,'')`
+
+type resourceTextI18n struct {
+	TitleZhTw, TitleZhCn, TitleEn string
+	DescZhTw, DescZhCn, DescEn    string
+	BodyZhTw, BodyZhCn, BodyEn    string
+}
+
+func pickLangField(r *http.Request, zhTW, zhCN, en string) string {
+	lang := strings.TrimSpace(r.URL.Query().Get("lang"))
+	if lang == "" {
+		lang = r.Header.Get("Accept-Language")
+	}
+	lang = strings.ToLower(strings.TrimSpace(strings.Split(lang, ",")[0]))
+	switch {
+	case strings.HasPrefix(lang, "zh-cn"), lang == "zh-hans":
+		if zhCN != "" {
+			return zhCN
+		}
+	case strings.HasPrefix(lang, "en"):
+		if en != "" {
+			return en
+		}
+	}
+	if zhTW != "" {
+		return zhTW
+	}
+	if zhCN != "" {
+		return zhCN
+	}
+	return en
+}
+
+func (t resourceTextI18n) pick(r *http.Request) (title, description, body string) {
+	return pickLangField(r, t.TitleZhTw, t.TitleZhCn, t.TitleEn),
+		pickLangField(r, t.DescZhTw, t.DescZhCn, t.DescEn),
+		pickLangField(r, t.BodyZhTw, t.BodyZhCn, t.BodyEn)
+}