Detailed explanation of WeChat mini program login process

This article mainly explains in detail the relevant information about the WeChat Mini Program login process. Friends who need it can refer to

WeChat Mini Program Login Process

##1 ：What are session_key and openId? session_key

The official description is:

session_key is the key generated by the WeChat

service server to encrypt and sign user data

Purpose of session_key

(1) Decrypt the "ciphertext in user information" obtained by wx.getUserInfo()

interface. (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) Treat this random number as The key of session, session_key + openid is value.

That is: session[3rd_session]=session_key+openid

openIdopenId: the user’s unique identifier

That is: each WeChat user in your mini program unique identifier.

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

Getting steps:

(1) Get appid, secret, js_code

(2) Replace the APPID, SECRET, and JSCODE of the above interface address with appid, secret, and js_code respectively. Leave the others unchanged and assemble them into a complete address.

For example:

3: In "Open this address in the browser" or "Simulate the browser in the background" GET executes this address" to return the following JSONdata (including openid, sessionkey)

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

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

4: Obtain appid and secret

appid is the applet ID

secret is the applet key (AppSecret)

How to obtain: Mini program backend login URL: https://mp.weixin.qq.com/

After opening the mini program backend URL, register, and log in, you can find yours as shown below AppID and AppSecret.

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, use This way, individuals can also register.

Portal: http://www.wxapp-

union.com/forum.php?mod=viewthread&tid=495

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 for the WeChat applet, log in to the background and obtain the appId and secret in the settings (Key)

(2) Call the wx.login() interface to obtain the login credentials js_code
(3) Call the wx.request() interface to send the js_code to the server background
(4) In the server background, Known appId, secret, js_code

and then call the following official http interface, you can return to get openId, 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

Thank you for reading, I hope it can help everyone, thank you for your interest in this site support!

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