Migrate legacy routes¶

Introduced in InvenioRDM v11

This guide describes the process to migrate legacy routes using the redirector module.

Redirector module¶

The redirector module registers legacy routes (called source) and the redirection to a new target.

Redirection rules are retrieved by the application from the config REDIRECTOR_RULES.

Steps¶

• Identify the old endpoint url (e.g. /old_endpoint)
• Identify the new endpoint url (e.g. where to redirect a request to /old_endpoint).
• Add the config REDIRECTOR_RULES in the application (e.g. my_syte/config.py). E.g:

    REDIRECTOR_RULES = {
        "redirect_my_rule": {
            "source": "/old_endpoint",
            "target": "/new_endpoint"
        }
    }
  

Examples¶

Sometimes it is necessary to modify the request further (e.g. map old parameters to newer ones). The redirector module also accepts a function that returns a URL as the rule's target. Find below some examples

• Redirect a request to a new endpoint.

REDIRECTOR_RULES = {
  "redirect_my_rule": {
      "source": "/old_endpoint",
      "target": "/new_endpoint"
  }
}

• Redirect a request to a new endpoint whose view arguments have changed.

def redirect_function():
    # Anything is allowed here, as long as the function returns a valid url.
    from flask import url_for
    values = request.view_args
    # A new argument is injected
    values["new_argument"] = "foo"
    target = url_for("new_endpoint", **values)
    return target

REDIRECTOR_RULES = {
    "redirect_rule": {
        "source": "/old_endpoint",
        "target": redirect_function
    }
}

• Redirect a request to a new endpoint, specifying an HTTP code for the redirection.

def redirect_function():
    # Anything is allowed here, as long as the function returns a valid url.
    from flask import url_for
    values = request.view_args
    # A new argument is injected
    values["new_argument"] = "foo"
    target = url_for("new_endpoint", **values)
    return target, 302

REDIRECTOR_RULES = {
    "redirect_rule": {
        "source": "/old_endpoint",
        "target": redirect_function
    }
}