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    Authentication Method D

    Last updated: 2024-08-14 19:04:36
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      Format of Authentication URL

      http://Hostname/Filename?sign=md5hash&t=timestamp

      Parameter Description

      Field
      Description
      Hostname
      Site acceleration domain name.
      Path
      Resource access path, which must start with / during authentication.
      sign
      User-defined authentication parameter name.
      t
      User-defined timestamp parameter name
      timestamp
      Timestamp parameter.
      Format: Positive decimal integer Unix timestamp, which is the total number of seconds that have passed since 00:00:00, 1970.1.1 (UTC time) and is regardless of the time zone; or positive hexadecimal integer Unix timestamp, which is the total number of seconds that have passed since 00:00:00, 1970.1.1 (UTC time) and is regardless of the time zone.
      md5hash
      A string containing 32 characters calculated based on the MD5 algorithm:
      Algorithm: MD5 (key + Path + timestamp). Note: During calculation, the hexadecimal number identifier 0x of the hexadecimal timestamp must be filtered out.
      Authentication logic: If the request has not expired, the node will compare this string value with the md5hash value carried in the request URL. If the values are the same, the request will pass the authentication, and a response will be made to the request; if the values are different, the authentication will fail, and 403 will be returned.

      Configuration Example

      Assuming authentication method D is used for the requested URL https://www.example.com/foo.jpg, the configuration is as follows:
      

      Getting Authentication Parameters

      Path: /foo.jpg.
      timestamp: The time when the server generates the authentication URL is 15:51:47, July 15, 2024 (UTC+8), the decimal (Unix timestamp) value of which is 1721029907.
      Key: DvYmqE81E1F9R791H6lmht.
      md5hash: MD5 (key + Path + timestamp) = MD5 (DvYmqE81E1F9R791H6lmht/foo.jpg1721029907) = cadcec4a04e67b9c2abf4b61c642a0dd.

      Authentication URL Generated by a Client Request

      https://www.example.com/foo.jpg?sign=cadcec4a04e67b9c2abf4b61c642a0dd&t=1721029907.

      Node Authentication

      When the node server receives a client request via the encrypted URL, it will parse the timestamp parameter in the URL, and compare the sum of it and the configured validity period of ''1 second'' with the current time:
      1. If the current time is after the ''timestamp + validity period'' time, it indicates that the request has expired, and 403 will be returned directly. If the current time is before the ''timestamp + validity period'' time, it indicates that the request has not expired, and the node server will go to step 2.
      2. The node server calculates the md5hash value based on the obtained authentication parameters and compares it with the md5hash value carried in the request URL. If the values are the same, the request will pass the authentication, and a response will be made to the request; if the values are different, the authentication will fail, and 403 will be returned.
      
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