Short url redirector for Cloudflare Worker with D1 database.

Language: JavaScript

Platform: Cloudflare Worker with D1 database.

• Deploy in Cloudflare directly using Worker.
• Multiple host names supported.

See deployment file.

See management file.

When a request is received by ShortUrl, it will follow these steps.

1. Gets the host from the HTTP Header.
2. Gets the path segments from the HTTP Header as the access key.
3. Enters the Global Management page when
   • The access key equals to Global Management Key. And,
   • The host is allowed to enter Global Management page when
     • The host exists in Global Management Enabled Hosts. Or,
     • The list Global Management Enabled Hosts is empty.
4. Resolves by aliases when the host equals(*1) the Alias column of one record in Aliases from Global Management, choosing Target as the new value of host and restart this step. Aliases could be resolved recursively with 16 as the max depth.
5. Processes the request against the domain when the host equals(*1) Domain column of one record in Domains from Global Management.
   1. Enters the Domain Management page when access key equals to Domain Management Key.
   2. Resolves by redirects when the access key equals(*2) the address column of one record in Redirects from Domain Management of this domain.
      • When the Target from the record matched is starting with >, gets the text after > from Target as the new value of access key and restart this step. Redirects could be resolved recursively with 16 as the max depth. Or,
      • Redirects to Target specified of the record matched.
   3. Redirects to Default Redirect Target specified in Domain Management of this domain if it is not empty.
6. Redirects to Default Redirect Target specified in Global Management.

• Host name matching is case insensitive.
• Port number 443 should not present, but all others should and will be treated separately. For example:
  • The record example.com will be matched with the host example.com and example.com:443.
  • The record example.com:8080 will be matched with the host example.com:8080 only.
• The record with the key ends with :443 in domains or aliases will not be matched unless it's pointed by other matched alias records.

Name matching could be case sensitive or insensitive, based on the setting Ignore Case When Matching specified in the Domain Management of the related domain.

When redirecting:

• HTTP 308 will be used, when Use HTTP 308 instead of 307 or Use HTTP 308 is selected. Or HTTP 307 will be used.
• When Attach Query Process is enabled,
  • If the query string exists in the request:
    • When character ? presents in the target of the redirection record, the query string from the request will be appended to the target， using & as the connector.
    • When character ? absents from the target of the redirection, the query string from the request will be appended to the target， using ? as the connector.
  • If the query string absents from the request: The target of the redirection record will be used without modification.
  • Note: This function valids for redirection only. The value will be ignored for the record with target starting with >, < and ".
• When Attach Query Process is disabled, the query string, if exists, from the request will be dropped. The target of the redirection record will be used without modification.