====== 測試建構 LINE BOT (Developer Trial 方案) ======

  * 環境 : CentOS Linux release 7.6.1810 (Core)
  * 語言 : PHP 7.2
  * Web : Nginx 1.12.2
  * DB : MariaDB 5.5.60

===== 申請Developer Trial帳號 =====
  * 參考 - http://at-blog.line.me/tw/create_developer_trial
  - https://developers.line.biz/en/
  - 使用自己的 LINE 帳號登入
  - Create new provider
  - Create new channel -> Messaging API -> Plan : Developer Trial

===== 建立開發環境 =====
  * 安裝 php 與 httpd 相關套件<code sh>
yum install epel-release
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
yum install composer mariadb mariadb-server nginx unzip php72w php72w-cli php72w-common php72w-curl php72w-fpm php72w-gd php72w-mbstring php72w-mysqlnd php72w-process php72w-snmp php72w-xml php72w-zip php72w-opcache
</code>
  * 設定 Web server - nginx <code sh>
vi /etc/php-fpm.d/www.conf
</code><file>
:
;user = apache
user = nginx
; RPM: Keep a group allowed to write in log dir.
group = apache

; The address on which to accept FastCGI requests.
; Valid syntaxes are:
;   'ip.add.re.ss:port'    - to listen on a TCP socket to a specific IPv4 address on
;                            a specific port;
;   '[ip:6:addr:ess]:port' - to listen on a TCP socket to a specific IPv6 address on
;                            a specific port;
;   'port'                 - to listen on a TCP socket to all addresses
;                            (IPv6 and IPv4-mapped) on a specific port;
;   '/path/to/unix/socket' - to listen on a unix socket.
; Note: This value is mandatory.
;listen = 127.0.0.1:9000
listen = /var/run/php-fpm/php7.2-fpm.sock

; Set listen(2) backlog.
; Default Value: 511 (-1 on FreeBSD and OpenBSD)
;listen.backlog = 511

; Set permissions for unix socket, if one is used. In Linux, read/write
; permissions must be set in order to allow connections from a web server. Many
; BSD-derived systems allow connections regardless of permissions.
; Default Values: user and group are set as the running user
;                 mode is set to 0660
;listen.owner = nobody
;listen.group = nobody
;listen.mode = 0660
listen.owner = nginx
listen.group = nginx
listen.mode = 0660

; When POSIX Access Control Lists are supported you can set them using
; these options, value is a comma separated list of user/group names.
:
</file><code sh>
systemctl enable php-fpm
systemctl restart php-fpm

vi /etc/nginx/nginx.conf
</code><file>
:
    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

 charset utf-8;
 gzip on;
 gzip_types text/css application/javascript text/javascript application/x-javascript image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon;
 location / {
  try_files $uri $uri/ /index.php?$query_string;
 }
 location /api/v0 {
  try_files $uri $uri/ /api_v0.php?$query_string;
 }
 location ~ \.php {
  include fastcgi.conf;
  fastcgi_split_path_info ^(.+\.php)(/.+)$;
  fastcgi_pass unix:/var/run/php-fpm/php7.2-fpm.sock;
 }
 location ~ /\.ht {
  deny all;
 }


        error_page 404 /404.html;
            location = /40x.html {
:
</file><code sh>
systemctl enable nginx
systemctl restart nginx
</code>

===== 驗證 Webhook 是否可以正確連上 =====

  * 假設 Channel 為 iChiaYi-Bot
  * Use webhooks -> Enable  
  * 假設 Webhook URL 為 https://www.ichiayi.com/linebot/Webhook.php -> 按下 Verify 後要能夠看到 Success
  * 如果想要讓 Bot 可以被邀請加入某群組中 Allow bot to join group chats -> Enable

===== 安裝 line-bot-sdk-php =====
  * 透過 composer 安裝 <code sh>
cd /usr/share/nginx/
composer require linecorp/line-bot-sdk
cd vendor/linecorp/line-bot-sdk/
composer install
</code>

===== 寫一個 LINE BOT 程式 =====
  * 至 https://developers.line.biz/console/ 選上面建立的 Provider -> channel Exp. iChiayi-Bot (Messaging API)
    * Channel settings :
        * QR Code : 可以讓手機 LINE 直接掃描加 BOT 當好友，也可以將 BOT 邀請到 LINE 群組內
        * Channel secret : 提供後續開發時重要的 KEY, 大概長的像這樣<file>629345c1d259db2e59c308e05b371f5x</file>
        * Channel access token(long-lived) : 提供後續開發時重要的 KEY, 大概長的像這樣<file>
U2nmqwuvXIA0h0JyDzeeSP/51YwnkbcCCw89BzCOCav9+cc+kTTWugtWdbw729e3VBfXt6B4NrCu9F3+yHWWC4Wx235D123+4J42IWSDrzj4PTiB68DkHN7W4dq4XQJi9kdpNpbw90EsdfrRqc3NtwdB04t89/1O/w1cDnyilFU=
</file>
  * 開始寫一個簡單的 BOT 程式 Webhook.php<code sh>
vi /usr/share/nginx/html/Webhook.php
</code><code php>
<?php
require '/usr/share/nginx/vendor/linecorp/line-bot-sdk/vendor/autoload.php';
$httpClient = new \LINE\LINEBot\HTTPClient\CurlHTTPClient('<channel access token>');
$bot = new \LINE\LINEBot($httpClient, ['channelSecret' => '<channel secret>']);
?>
</code>

===== 參考網址 =====
  * https://developers.line.biz/en/docs/messaging-api/building-bot/
  * https://developers.line.me/messaging-api/getting-started
  * https://github.com/line/line-bot-sdk-php
  * https://packagist.org/packages/linecorp/line-bot-sdk
  * https://webtatic.com/packages/php56/
  * http://www.agix.com.au/install-composer-on-centosredhat/
  * https://laracasts.com/discuss/channels/servers/problems-with-missing-php-extensions