Summary of mini program login process

First of all, let me introduce the mini program to you.

A mini program is an application that can be used without downloading or installing. It realizes the dream of having an application "at your fingertips". Users can open the application by scanning or searching. It also embodies the concept of "use and go", and users do not need to worry about installing too many applications. Applications will be everywhere and available at any time, but there will be no need to install or uninstall them.

1: What are session_key and openId?

session_key

The official description is:
session_key is the key generated by the WeChat server for encrypting and signing user data
Purpose of session_key
(1) For wx. The getUserInfo() interface obtains the "ciphertext in user information" for decryption.
(2) "Process it slightly" and use it to maintain the login state of the applet.
"A little processing" is roughly as follows:
(1) Generate a random number (officially called it 3rd_session)
(2) Use this random number as the session key, and the session_key openid is value.
That is: session[3rd_session]=session_key openid

openIdopenId: user’s unique identifier
That is: the unique identifier of each WeChat user in your mini program.

2: How to obtain session_key and openId. The official HTTP interface is provided:
https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret =SECRET&js_code=JSCODE&grant_type=authorization_code
Obtaining steps:
(1) Obtain appid, secret, js_code
(2) Use appid, secret, js_code to replace the APPID, SECRET, and JSCODE of the above interface address respectively, and the others are not Change and assemble into a complete address.
For example:

WeChat applet obtains session_key and openId (encryption, decryption, signature series)


3: In "Open this address in a browser" or "Simulate a browser in the background" "GET execute this address" will return the following JSON data (including openid, sessionkey)

WeChat applet obtains session_key and openId (encryption, decryption, signature series)

Summary: From 1, It can be seen from steps 2 and 3 that as long as the appid, secret and js_code are obtained, the session_key and openId can be obtained

4: Obtaining the appid and secret

appid is the mini program ID
secret is the mini program key (AppSecret)
How to obtain: mini program background login URL: https://mp.weixin.qq.com/
Open the mini program background URL, After registering and logging in, you can find your AppID and AppSecret as shown below.

The WeChat mini program obtains session_key and openId (encryption, decryption, signature series)

Note: Currently, individuals cannot register for the mini program, and the scope of open registration is: enterprises, governments, media, and other organizations;
Of course, individuals can also register using this method.
Portal: http://www.moquu.com/v/372.html

5: How to obtain js_code by calling the wx.login() interface to obtain the login credentials (js_code)

WeChat applet obtains session_key and openId (encryption, decryption, signature series)

6: Summarize the entire session_key acquisition process (1) Register the WeChat applet, log in to the background and obtain the appId and secret (key) in the settings
(2) Call the wx.login() interface to obtain the login credentials js_code
(3) Call the wx.request() interface to send js_code to the server background
(4) In the server background, the appId, secret, js_code
are known and then call the following official http interface, that is You can return to get openId and session_key

The official http interface address is:
https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code

Related recommendations: Mini Program Development Tutorial

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