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之前看到網路上很多人都在玩LINE 的LIFF，尤其是看到官方文章這篇，感覺就超級有趣的，想說自己也來寫一個玩看看，因為之前比較少接觸JavaScript，所以花了一點時間研究一下，下面來簡單講一下實作過程吧~
* LIFF(Line Front-end Framework)是一個可以在 LINE app 內運作的 web app 平台，並且浮現在對話視窗中。
* 相關LIFF 官方介紹及可以使用的API文件 => Link
* 除了要會一些python寫Chatbot，還要學一下HTML與JavaScrip一下
Target:
目標是建一個可以畫圖並傳送出來的LIFF，同時想說也順便加上可以即時翻譯的LINE BOT， 練習兩樣功能的實作。最後呈現如下圖，我畫的有點醜請見諒XD
Step:
1. 建立draw連結對象
如果要用LIFF畫圖就要先建立一個可以連結畫圖的網站，所以首先要先用簡單的HTML與JavaScript來架一個給我LIFF畫圖的連結(link)，下面先放上我簡單寫的程式碼，很少在寫前端，所以有比較奇怪地方請告知一下。
我的後端是使用用Python的Flask框架，而前段就用HTML + Node.js
下面有幾點要注意一下
* 如果是使用Flask框架的話要注意資料夾的階層位置次序，因為Flask在跑的時候會依照資料夾名稱去抓要使用到的檔案，所以資料夾名稱也要正確才行，templates 與 static 都是相對應於主程式.py的位置，templates資料夾是存放副檔名為.html的檔案 ; 而 static 裡面分別有images 資料夾存放圖片檔案與js 資料夾存放副檔名為.js的檔案。
* 每次在push js檔案上去時候要記得在 <script src="..address...xxx.js?v=138"></script> 裡面更改v=後面的參數(亂打即可)，如果沒有更改的話，Chrome還是會去抓之前沒修改過的，我試過刪除cookie還是一樣。
* 把所有檔案都Push到Heroku後，測試過網址沒問題後，就要到Line Developers，找到你要使用的機器人 Channel，點選列表的LIFF，就可以加入了喔~
* 圖片如果要存起來需要另外加入資料庫，我這邊是使用Heroku來暫存，所以畫完的圖過沒多久就會在heroku的路徑上消失了
資料檔案階層結構
draw.js
window.onload = function() {
var canvas = document.getElementById('main');
var canvastop = canvas.offsetTop
var context = canvas.getContext("2d");
var lastx;
var lasty;
var color = "#000000"
var width_can = 1;
context.strokeStyle = color;
context.lineCap = 'round';
context.lineJoin = 'round';
context.lineWidth = width_can;
function colort() {
switch (this.id) {
case "green":
color = "green";
break;
case "blue":
color = "blue";
break;
case "red":
color = "red";
break;
case "yellow":
color = "yellow";
break;
case "orange":
color = "orange";
break;
case "black":
color = "black";
break;
case "white":
color = "white";
break;
case "gray":
color = "gray";
break;
case "lightgreen":
color = "#99FF99";
break;
case "lightblue":
color = "#99FFFF";
break;
case "lighgray":
color = "#DDDDDD";
break;
}
}
function clear() {
context.fillStyle = "#ffffff";
context.rect(0, 0, 350, 330);
context.fill();
}
function share() {
$.ajax({
type: 'POST',
url: '/fileupload',
data: {
'image': canvas.toDataURL('image/jpeg', 1.0)
},
success: function (res, status) {
liff.getProfile().then(function (profile) {
liff.sendMessages([
{
type: 'image',
originalContentUrl: 'https://yourURL......herokuapp.com/static/images/' + res + '.jpg',
previewImageUrl: 'https://yourURL.....herokuapp.com/static/images/' + res + '_240.jpg'
},
{
type: 'text',
text: '猜猜看這是什麼'
}
]).then(function () {
liff.closeWindow();
}).catch(function (error) {
alert('Error sending message: ' + error.message);
});
}).catch(function (error) {
alert("Error getting profile: " + error.message);
});
},
error: function (res) {
alert('Error saving image: ' + res.status);
},
complete: function(data) {
}
});
liff.sendMessages([
{
type: 'image',
originalContentUrl: imgData,
previewImageUrl: imgData,
}
]).then(()=> {
liff.closeWindow();
});*/
}
function showimage(){
switch (this.id) {
case "bear":
url = "yor pic url"
break;
}
var img = new Image();
img.onload = function(){
context.drawImage(img, 0, 0, 350, 330);
};
img.src = url;
}
function dot(x,y) {
context.beginPath();
context.lineWidth = width_can;
context.strokeStyle = color;
context.fillStyle = "#000000";
context.arc(x,y,1,0,Math.PI*2,true);
context.fill();
context.stroke();
context.closePath();
}
function line(fromx,fromy, tox,toy) {
context.strokeStyle = color;
context.lineWidth = width_can;
context.beginPath();
context.moveTo(fromx, fromy);
context.lineTo(tox, toy);
context.stroke();
context.closePath();
}
function show(){
num = document.getElementById("num");
num.innerHTML = "數值顯示：" + ran.value;
width_can = ran.value;
}
canvas.ontouchstart = function(event){
event.preventDefault();
lastx = event.touches[0].clientX;
lasty = event.touches[0].clientY - canvastop;
dot(lastx,lasty);
}
canvas.ontouchmove = function(event){
event.preventDefault();
var newx = event.touches[0].clientX;
var newy = event.touches[0].clientY - canvastop;
line(lastx,lasty, newx,newy);
lastx = newx;
lasty = newy;
}
......
......
......
......2. 建立Line bot
Line bot 相對來說就是提供上一步的URL，有很多種方式可以呈現，像是透過 richmenu 或 關鍵字等等，在我這邊是可以透過輸入 gaming 或在 richmenu 點選，感覺LIFF還可以有很多種應用，等之後有空再來仔細來研究還有沒有什麼其他有趣的應用!
* 我這邊資料庫是連結自己搭建的MongoDB
Line Bot.py
"""
Created on Tue Sep 17 20:25:25 2019
deploy this application to heroku at proposalbot
@author: kevin
"""
#....import your module........
app = Flask(__name__)
line_bot_api = LineBotApi(os.getenv('Channel_access_token',None))
handler = WebhookHandler(os.getenv('Channel_secret', None))
@app.route("/callback", methods=['POST'])
def callback():
print('----------in-------')
# get X-Line-Signature header value
signature = request.headers['X-Line-Signature']
# get request body as text
body = request.get_data(as_text=True)
app.logger.info("Request body: " + body)
# handle webhook body
try:
handler.handle(body,signature)
except LineBotApiError as e:
print("Catch exception from LINE Messaging API: %s\n" % e.message)
for m in e.error.details:
print("ERROR is %s: %s" % (m.property, m.message))
print("\n")
except InvalidSignatureError:
abort(400)
return 'OK'
# def init_richmenu(event):
# _id = os.getenv('first_richmenu', None)
# print(_id)
# line_bot_api.link_rich_menu_to_user(event.source.user_id, _id)
@handler.add(MessageEvent, message=TextMessage)
def handle_msg_text(event):
# init_richmenu(event)
message = event.message.text
profile = line_bot_api.get_profile(event.source.user_id)
mongo = MongoOperator(profile, message)
chat = mongo.checkChat() #沒有chat就return None
mongo.profileExist()
if message == 'getRiddle':
items = mongo.gettGuess()
print(len(items))
r = random.randint(0, len(items)-1)
print(r)
t = items[r]
line_bot_api.reply_message(
event.reply_token,
TextSendMessage(text=t)
)
if message == 'set menu':
_id = os.getenv('first_richmenu', None)
print(_id)
line_bot_api.link_rich_menu_to_user(event.source.user_id, _id)
line_bot_api.reply_message(
event.reply_token,
TextSendMessage(text = 'set')
)
elif event.message.text.lower() == 'all_richmenu':
t= ''
rich_menu_list = line_bot_api.get_rich_menu_list()
for rich_menu in rich_menu_list:
print(rich_menu.rich_menu_id)
t += rich_menu.rich_menu_id
line_bot_api.reply_message(
event.reply_token,
TextSendMessage(text=t)
)
elif event.message.text.lower() == 'gaming':
items = mongo.gettGuess()
# items = ["多拉a夢", "熊", "魚"]
r = random.randint(0, len(items) - 1)
item = items[r]
item = "多拉a夢"
buttons_template = TemplateSendMessage(
alt_text='play gmae with friend',
template=ButtonsTemplate(
title='Play gmae with friend',
text='Have fun drawing and guessing according to following topic',
thumbnail_image_url='https://i.imgur.com/TPELVeP.jpg',
actions=[
MessageTemplateAction(
label='需要畫的題目',
text= item
),
URITemplateAction(
label='開始畫',
uri='line://app/1622537665-your_URL'
)
]
)
)
line_bot_api.reply_message(event.reply_token, buttons_template)
else:
token = Token()
tk = token.calculate_token(message)
print(tk)
#sl是來源語言(Source language) ; tl是目標語言(Target language) 來源可以設定auto，但目標語言一定要設定一個特定語言->繁體中文為zh-TW 英文為en
url = 'https://translate.google.com/translate_a/single?client=webapp&sl=auto&tl=en&hl=zh-TW&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&source=bh&ssel=0&tsel=0&kc=1&tk={}&q={}'.format(tk, quote(message))
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36'}
req = requests.get(url=url, headers=headers)
data = req.json()
response = data[0][0][0]
line_bot_api.reply_message(
event.reply_token,
TextSendMessage(text = response)
)
if __name__ == "__main__":
port = int(os.environ.get('PORT', 5000))
app.run(host='0.0.0.0', port=port)
Demo:
畫畫部分:
翻譯部分:
Reference:
https://www.w3schools.com/jquery/jquery_get_started.asp
https://www.wibibi.com/info.php?tid=388
http://www.wibibi.com/info.php?tid=117
https://stackoverflow.com/questions/2368784/draw-on-html5-canvas-using-a-mouse
https://pydoing.blogspot.com/2011/09/javascript-onclick.html
Ajax相關:
https://ithelp.ithome.com.tw/articles/10200409
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