第12 屆iT邦幫忙鐵人賽系列文章 (Day14)
在 Line 的官方帳號可以設定進入時的選單，讓使用者快速點選，設定方式可以從官方帳號後台(有既定的範本可以參考)，或者是用程式自己指定(可以自己控制圖片的座標&設定點選區塊)，以下分別介紹
從官方帳號後台
這應該是最方便的方式了，Line 已經提供了一些範本和設計規範，只要照著範本製作一個圖片，並設定每個區塊要觸發的事件，即可完成一個圖文選單
進入 https://manager.line.biz/ 選擇圖文選單 => 建立 => 設計規範 => 下載範本，(或者直接點此下載)，下載後會是一個壓縮檔，今天來用這個範例做修改
我們用 PhotoShop 改成我們要的圖片 (這就不介紹啦) https://imgur.com/ev4LQzp.jpg
上傳圖片，並設定 A.B.C 所要觸發的文字
這樣就完成了，是不是很方便阿
從程式指定 Rich Menu
程式就沒有用 Business 後台直接上傳圖片來得那麼方便，但程式可以做到極彈性，它可以自訂圖片的座標來設定 click 的範圍，可以針對使用者來動態的切換 Rich Menu 等等…。Rich Menu 所牽扯的 Api 有點多，故先整理今天會實作的 Api 清單如下
Get rich menu list：取得此 chatbot 已註冊的 Rich Menu 清單 Upload rich menu image：設定 Rich Menu 的圖片 Set default rich menu：設定所檢視的 Rich Menu
新增 LineRichMenuUtility.cs
之前 Message API 我們做了 一個 Utility ，Rich Menu 我們也新增一個
public class LineRichMenuUtility
{
private readonly string accessToken;
private static string lineMessageApiBaseUrl = "https://api.line.me/v2/bot/richmenu";
private static string lineMessageApiBaseUrlForAllUser = "https://api.line.me/v2/bot/user/all/richmenu";
public LineRichMenuUtility(IOptions<LineSetting> lineSetting)
{
accessToken = lineSetting.Value.ChannelAccessToken;
}
....
}
Get rich menu list：取得此 chatbot 已註冊的 Rich Menu 清單
RichMenuResponse 這個 class 內容來自於這個文件
public async Task<RichMenuResponse> GetRichMenuListAsync()
{
using (var httpClient = new HttpClient())
{
using (var request = new HttpRequestMessage(new HttpMethod("GET"), $"{lineMessageApiBaseUrl}/list"))
{
request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {accessToken}");
var response = await httpClient.SendAsync(request);
var result = await response.Content.ReadAsStringAsync();
var richMenuRes = JsonConvert.DeserializeObject<RichMenuResponse>(result);
return richMenuRes;
}
}
}
Upload rich menu image：設定 Rich Menu 的圖片
public async Task UploadRichMenuImage(string imgUrl, string richMenuId)
{
using (var httpClient = new HttpClient())
{
using (var request = new HttpRequestMessage(new HttpMethod("POST"), $"lineMessageApiBaseUrl/{richMenuId}/content"))
{
request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {accessToken}");
var imgBytes = GetImage(imgUrl);
request.Content = new ByteArrayContent(imgBytes);
request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json");
var response = await httpClient.SendAsync(request);
var results = await response.Content.ReadAsStringAsync();
};
}
}
private byte[] GetImage(string url)
{
var request = (HttpWebRequest)WebRequest.Create(url);
var response = (HttpWebResponse)request.GetResponse();
using (Stream dataStream = response.GetResponseStream())
{
if (dataStream == null)
return null;
using (var sr = new BinaryReader(dataStream))
{
byte[] bytes = sr.ReadBytes(100000000);
return bytes;
}
}
}
Set default rich menu：設定預設的 Rich Menu
CreateRichmenu 這個 class 內容來自於這個文件
自己用程式定義的麻煩點就在這，要設長寬和這種座標與Action，但未來可以考慮將一些常用範本用程式封裝起來，直接使用
public async Task<Richmenu> SetDefaultRichMenuAsync()
{
using (var httpClient = new HttpClient())
{
using (var request = new HttpRequestMessage(new HttpMethod("POST"), lineMessageApiBaseUrl))
{
request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {accessToken}");
var defaultRichMenu = new CreateRichmenu();
defaultRichMenu.size = new CreateSize(1200, 810);
defaultRichMenu.selected = true;
defaultRichMenu.name = "Default RichMenu";
defaultRichMenu.chatBarText = "Kyle's Wedding";
defaultRichMenu.areas = new List<CreateArea>()
{
new CreateArea(boundx:0,boundy:0,width:800,height:810, _action: new MessageAction("婚紗輪播"))
};
var postJson = JsonConvert.SerializeObject(defaultRichMenu, new JsonSerializerSettings
{
NullValueHandling = NullValueHandling.Ignore,
ContractResolver = new DefaultContractResolver
{
NamingStrategy = new CamelCaseNamingStrategy()
}
});
request.Content = new StringContent(postJson);
request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json");
var response = await httpClient.SendAsync(request);
var results = await response.Content.ReadAsStringAsync();
var richmenu = JsonConvert.DeserializeObject<Richmenu>(results);
return richmenu;
};
}
}
Set default rich menu：設定所"指定"的 Rich Menu
public async Task SetDefaultRichMenuAsync(string richId)
{
using (var httpClient = new HttpClient())
{
using (var request = new HttpRequestMessage(new HttpMethod("POST"), $"{lineMessageApiBaseUrlForAllUser}/{richId}"))
{
request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {accessToken}");
var response = await httpClient.SendAsync(request);
var results = await response.Content.ReadAsStringAsync();
}
}
}
回到 Api Controller，我們在 app 啟動的時候給設定 Rich Menu
InitRichMenu 實作
public async Task InitRickMenu()
{
var rickResponse = await lineRichMenuUtility.GetRichMenuListAsync();
if(rickResponse.richmenus.Count == 0)
{
// 沒有取到任何 Rich Menu，設定預設
var richMenu = await lineRichMenuUtility.SetDefaultRichMenuAsync();
await lineRichMenuUtility.UploadRichMenuImage("https://i.imgur.com/ev4LQzp.jpg", richMenu.richMenuId);
}
else
{
// 取得預設並設定該 Rich Menu
var defaultRich = rickResponse.richmenus.First(c => c.name == "Default RichMenu");
await lineRichMenuUtility.SetDefaultRichMenuAsync(defaultRich.richMenuId);
}