defmodule WeChat.WebPage do
@moduledoc """
网页开发
## API Docs
* [网页授权](https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html){:target="_blank"}
* [JS-SDK](https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/JS-SDK.html){:target="_blank"}
"""
alias WeChat.{Requester, Utils, Card, User, Storage.Cache}
@typedoc """
授权范围
* `"snsapi_base"` - 静默授权
* `"snsapi_userinfo"` - 用户的基本信息(无须关注)
"""
@type scope :: String.t()
@typedoc "重定向后会带上state参数，开发者可以填写a-zA-Z0-9的参数值，最多128字节"
@type state :: String.t()
@typedoc "授权后重定向的回调链接地址， 请使用 urlEncode 对链接进行处理"
@type redirect_uri :: String.t()
@type code :: String.t()
@type access_token :: String.t()
@type refresh_token :: String.t()
@type ticket :: String.t()
@type wx_card_ticket :: ticket
@type js_api_ticket :: ticket
@type url :: String.t()
@type signature :: String.t()
@type timestamp :: non_neg_integer
@type nonce_str :: String.t()
@type js_sdk_config :: %{
appId: WeChat.appid(),
signature: signature,
timestamp: timestamp,
nonceStr: nonce_str
}
@type card_ext :: String.t()
@type card_config :: %{cardId: Card.card_id(), cardExt: card_ext}
@typedoc """
JS API的临时票据类型
* `"jsapi"` - JS-SDK Config
* `"wx_card"` - 微信卡券
"""
@type js_api_ticket_type :: String.t()
@doc_link "https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps"
@component_doc_link "https://developers.weixin.qq.com/doc/oplatform/Third-party_Platforms/Official_Accounts/official_account_website_authorization.html"
@doc """
网页授权 - 请求`code`
官方文档:
* [Official Account](#{@doc_link}/Wechat_webpage_authorization.html#0){:target="_blank"}
* [Component](#{@component_doc_link}){:target="_blank"}
关于网页授权回调域名的说明
- 在微信公众号请求用户网页授权之前，开发者需要先到公众平台官网中的 “`开发` - `接口权限` - `网页服务` - `网页帐号` - `网页授权获取用户基本信息`” 的配置选项中，
修改授权回调域名。请注意，这里填写的是域名（是一个字符串），而不是URL，因此请勿加 `http://` 等协议头；
- 授权回调域名配置规范为全域名，比如需要网页授权的域名为：`www.qq.com`，配置以后此域名下面的页面 `http://www.qq.com/music.html`、
`http://www.qq.com/login.html` 都可以进行 `OAuth2.0` 鉴权。但 `http://pay.qq.com`、`http://music.qq.com` 、 `http://qq.com`
无法进行 `OAuth2.0` 鉴权
- 如果公众号登录授权给了第三方开发者来进行管理，则不必做任何设置，由第三方代替公众号实现网页授权即可
"""
@spec oauth2_authorize_url(WeChat.client(), redirect_uri, scope, state) :: url
def oauth2_authorize_url(client, redirect_uri, scope \\ "snsapi_base", state \\ "") do
[
"https://open.weixin.qq.com/connect/oauth2/authorize?",
["appid=", client.appid()],
["&redirect_uri=", URI.encode_www_form(redirect_uri)],
"&response_type=code",
["&scope=", scope],
if match?("", state) do
[]
else
["&state=", state]
end,
if client.by_component?() do
["&component_appid=", client.component_appid(), "#wechat_redirect"]
else
"#wechat_redirect"
end
]
|> IO.iodata_to_binary()
end
@doc """
网页授权 - 通过`code`换取`access_token`
官方文档:
* [Official Account](#{@doc_link}/Wechat_webpage_authorization.html#1){:target="_blank"}
* [Component](#{@component_doc_link}){:target="_blank"}
"""
@spec code2access_token(WeChat.client(), code) :: WeChat.response()
def code2access_token(client, code) do
if client.by_component?() do
component_appid = client.component_appid()
client.get(
"/sns/oauth2/component/access_token",
query: [
appid: client.appid(),
code: code,
grant_type: "authorization_code",
component_appid: component_appid,
component_access_token: Cache.get_cache(component_appid, :component_access_token)
]
)
else
client.get("/sns/oauth2/access_token",
query: [
appid: client.appid(),
secret: client.appsecret(),
code: code,
grant_type: "authorization_code"
]
)
end
end
@doc """
网页授权 - 刷新`access_token`
由于`access_token`拥有较短的有效期，当`access_token`超时后，可以使用`refresh_token`进行刷新，
`refresh_token`有效期为30天，当`refresh_token`失效之后，需要用户重新授权。
官方文档:
* [Official Account](#{@doc_link}/Wechat_webpage_authorization.html#2){:target="_blank"}
* [Component](#{@component_doc_link}){:target="_blank"}
"""
@spec refresh_token(WeChat.client(), refresh_token) :: WeChat.response()
def refresh_token(client, refresh_token) do
if client.by_component?() do
component_appid = client.component_appid()
client.get("/sns/oauth2/component/refresh_token",
query: [
appid: client.appid(),
grant_type: "refresh_token",
refresh_token: refresh_token,
component_appid: component_appid,
component_access_token: Cache.get_cache(component_appid, :component_access_token)
]
)
else
client.get("/sns/oauth2/refresh_token",
query: [
appid: client.appid(),
grant_type: "refresh_token",
refresh_token: refresh_token
]
)
end
end
@doc """
网页授权 - 拉取用户信息(需`scope`为`snsapi_userinfo`) -
[官方文档](#{@doc_link}/Wechat_webpage_authorization.html#3){:target="_blank"}
如果网页授权作用域为`snsapi_userinfo`,则此时开发者可以通过access_token和openid拉取用户信息了.
"""
@spec user_info(WeChat.openid(), access_token) :: WeChat.response()
def user_info(openid, access_token) do
Requester.OfficialAccount.get("/sns/userinfo",
query: [access_token: access_token, openid: openid]
)
end
@doc "See `user_info/2`"
@spec user_info(WeChat.requester(), WeChat.openid(), access_token) :: WeChat.response()
def user_info(requester, openid, access_token) when is_atom(requester) do
requester.get("/sns/userinfo",
query: [access_token: access_token, openid: openid]
)
end
@spec user_info(WeChat.openid(), access_token, User.lang()) :: WeChat.response()
def user_info(openid, access_token, lang) do
Requester.OfficialAccount.get("/sns/userinfo",
query: [
access_token: access_token,
openid: openid,
lang: lang
]
)
end
@doc "See `user_info/2`"
@spec user_info(WeChat.requester(), WeChat.openid(), access_token, User.lang()) ::
WeChat.response()
def user_info(requester, openid, access_token, lang) do
requester.get("/sns/userinfo",
query: [
access_token: access_token,
openid: openid,
lang: lang
]
)
end
@doc """
网页授权 - 检验授权凭证(`access_token`)是否有效 -
[官方文档](#{@doc_link}/Wechat_webpage_authorization.html#4){:target="_blank"}
"""
@spec auth(WeChat.openid(), access_token) :: WeChat.response()
def auth(requester \\ Requester.OfficialAccount, openid, access_token) do
requester.get("/sns/auth",
query: [access_token: access_token, openid: openid]
)
end
@doc """
生成 JS-SDK 配置 -
[官方文档](#{@doc_link}/JS-SDK.html#4){:target="_blank"}
返回 `maps` 包含: `appId/signature/timestamp/nonceStr`
"""
@spec js_sdk_config(WeChat.client(), url) :: js_sdk_config
def js_sdk_config(client, url) do
appid = client.appid()
appid
|> Cache.get_cache(:js_api_ticket)
|> sign_js_sdk(url, appid)
end
@doc """
生成 JS-SDK 配置(by ticket) -
[官方文档](#{@doc_link}/JS-SDK.html#4){:target="_blank"}
返回 `maps` 包含: `appId/signature/timestamp/nonceStr`
"""
@spec sign_js_sdk(js_api_ticket, url, WeChat.appid()) :: js_sdk_config
def sign_js_sdk(jsapi_ticket, url, appid) do
url = String.replace(url, ~r/\#.*/, "")
nonce_str = Utils.random_string(16)
timestamp = Utils.now_unix()
signature =
Utils.sha1(
"jsapi_ticket=#{jsapi_ticket}&noncestr=#{nonce_str}×tamp=#{timestamp}&url=#{url}"
)
%{appId: appid, signature: signature, timestamp: timestamp, nonceStr: nonce_str}
end
@doc """
生成微信卡券配置 - 添加卡券
## API Docs
* [微信卡券](#{@doc_link}/JS-SDK.html#53){:target="_blank"}
* [卡券扩展字段及签名生成算法](#{@doc_link}/JS-SDK.html#65){:target="_blank"}
"""
@spec add_card_config(WeChat.client(), Card.card_id(), outer_str :: String.t()) :: card_config
def add_card_config(client, card_id, outer_str) do
appid = client.appid()
card_ext =
appid
|> Cache.get_cache(:wx_card_ticket)
|> sign_card(card_id)
|> Map.merge(%{appid: client.appid(), outer_str: outer_str})
|> Jason.encode!()
%{cardId: card_id, cardExt: card_ext}
end
@doc """
生成微信卡券配置 - 添加卡券(绑定`openid`)
## API Docs
* [微信卡券](#{@doc_link}/JS-SDK.html#53){:target="_blank"}
* [卡券扩展字段及签名生成算法](#{@doc_link}/JS-SDK.html#65){:target="_blank"}
"""
@spec add_card_config(WeChat.client(), Card.card_id(), outer_str :: String.t(), WeChat.openid()) ::
map
def add_card_config(client, card_id, outer_str, openid) do
appid = client.appid()
card_ext =
appid
|> Cache.get_cache(:wx_card_ticket)
|> sign_card(card_id, openid)
|> Map.merge(%{appid: client.appid(), outer_str: outer_str, openid: openid})
|> Jason.encode!()
%{cardId: card_id, cardExt: card_ext}
end
@doc "See `sign_card/1`"
@spec sign_card(wx_card_ticket, Card.card_id()) :: map
def sign_card(wx_card_ticket, card_id), do: sign_card([wx_card_ticket, card_id])
@doc "See `sign_card/1`"
@spec sign_card(wx_card_ticket, Card.card_id(), WeChat.openid()) :: map
def sign_card(wx_card_ticket, card_id, openid), do: sign_card([wx_card_ticket, card_id, openid])
@doc """
卡券签名 -
[官方文档](#{@doc_link}/JS-SDK.html#65){:target="_blank"}
"""
@compile {:inline, sign_card: 1}
@spec sign_card(list :: [String.t()]) :: map
def sign_card(list) do
nonce_str = Utils.random_string(16)
timestamp = Utils.now_unix()
timestamp_str = Integer.to_string(timestamp)
signature = Utils.sha1([timestamp_str, nonce_str | list])
%{signature: signature, timestamp: timestamp, nonce_str: nonce_str}
end
@doc """
获取`api_ticket` -
[官方文档](#{@doc_link}/JS-SDK.html#62){:target="_blank"}
"""
@spec get_ticket(WeChat.client(), js_api_ticket_type) :: WeChat.response()
def get_ticket(client, type) do
client.get("/cgi-bin/ticket/getticket",
query: [type: type, access_token: client.get_access_token()]
)
end
end
