Wechat

Wechat API wrapper in Elixir.

Installation

defdepsdo[{:wechat,"~> 0.4.0"}]end

Configuration (optional)

config:wechat,adapter_opts: {Wechat.Adapters.Redis,["redis://localhost:6379/0"]},httpoison_opts: [recv_timeout: 300_000]

Create a client to call APIs

iex(1)>client=Wechat.Client.new(appid: "WECHAT_APPID",secret: "WECHAT_SECRET")%Wechat.Client{appid: "WECHAT_APPID",secret: "WECHAT_SECRET",endpoint: "https://api.weixin.qq.com/"}iex(2)>Wechat.User.get(client){:ok,%{"count"=>1,"data"=>%{"openid"=>["oi00OuKAhA8bm5okpaIDs7WmUZr4"]},"next_openid"=>"oi00OuKAhA8bm5okpaIDs7WmUZr4","total"=>1}}

Create a Wechat implementation

You can implement the Wechat module to simplify the usage.

First, create an implementation by use Wechat :

defmoduleMyApp.WechatdouseWechat,otp_app: :my_appdefusersdoclient()|>Wechat.User.get()endend

Config the implementation with Wechat credentials:

config:my_app,MyApp.Wechat,appid: "APP_ID",secret: "APP_SECRET",token: "TOKEN",encoding_aes_key: "ENCODING_AES_KEY"# Required if you enabled the encrypt mode

Wechat implementation examples

JS-SDK

https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/JS-SDK.html

<scripttype="text/javascript" src="//res.wx.qq.com/open/js/jweixin-1.4.0.js"></script><%= raw MyApp.Wechat.wechat_config_js(@conn, debug: false, api: ~w(previewImage closeWindow)) %><script>$(function(){varurls=[];$('img').map(function(){url=window.location.origin+$(this).attr('src'),urls.push(url);});$('img').click(function(e){wx.previewImage({current: window.location.origin+$(this).attr('src'),urls: urls});})});</script>

Process message in Phoenix

https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_standard_messages.html

• router.ex

defmoduleMyApp.Routerdoscope"/wechat",MyAppdoresources"/",WechatController,[:index,:create]endend

• wechat_controller.ex

defmoduleMyApp.WechatControllerdouseMyApp.Web,:controller# Validate signature paramplugWechat.Plugs.RequestValidator,module: MyApp.Wechat# Parse messageplugWechat.Plugs.MessageParser,[module: MyApp.Wechat]whenactionin[:create]defindex(conn,%{"echostr"=>echostr})dotextconn,echostrenddefcreate(conn,_params)do%{"ToUserName"=>to,"FromUserName"=>from,"Content"=>content}=conn.body_paramsreply=%{from: to,to: from,content: content}msg=Phoenix.View.render_to_string(EvercamWechatWeb.WechatView,"text.xml",reply: reply)# Return encrypted message if possiblecaseWechat.encrypt_message(msg)do{:ok,reply}->render(conn,"encrypt.xml",reply: reply){:error,_}->text(conn,msg)endendend

• text.xml.eex

<xml>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[<%= @reply.content %>]]></Content>
<ToUserName><![CDATA[<%= @reply.to %>]]></ToUserName>
<FromUserName><![CDATA[<%= @reply.from %>]]></FromUserName>
<CreateTime><%=DateTime.to_unix(DateTime.utc_now) %></CreateTime>
</xml>

• encrypt.xml.eex

<xml>
<Encrypt><![CDATA[<%= @reply.msg_encrypt %>]]></Encrypt>
<MsgSignature><![CDATA[<%= @reply.msg_signature %>]]></MsgSignature>
<TimeStamp><%=@reply.timestamp %></TimeStamp>
<Nonce><![CDATA[<%= @reply.nonce %>]]></Nonce>
</xml>

Users

• evercam_wechat