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https://issues.apache.org/jira/browse/SLING-10902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Norman closed SLING-10902.
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closing with the 2.2.16 release
> Add the ability to autogenerate a unique user/group principalName from a hint
> -----------------------------------------------------------------------------
>
> Key: SLING-10902
> URL: https://issues.apache.org/jira/browse/SLING-10902
> Project: Sling
> Issue Type: New Feature
> Reporter: Eric Norman
> Assignee: Eric Norman
> Priority: Major
> Fix For: JCR Jackrabbit User Manager 2.2.16
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> This is to support a use case where the user login form utilizes a field
> other than the principalName (i.e. email address or phone number) for
> authentication. For that use case, the exact principalName value isn't as
> important and a unique value can be auto-generated from some other hint. With
> a generated unique princpalName, the end user doesn't have to keep retrying
> to find a value that hasn't been used already.
> With this change the principalName value would be determined by the locating
> the first request parameter that is a match of one of the choices in the
> following order:
> 1. *":name"* - value is the exact name to use
> {code:java}
> curl -F:name=myuser -Fpwd=password -FpwdConfirm=password
> http://localhost:8080/system/userManager/user.create.html
> {code}
> 2. *":name@ValueFrom"* - value is the name of another submitted parameter
> whose value is the exact name to use
> {code:java}
> curl -F:name@ValueFrom=displayName -FdisplayName=myuser -Fpwd=password
> -FpwdConfirm=password
> http://localhost:8080/system/userManager/user.create.html{code}
> 3. *":nameHint"* - value is filtered, trimmed and made unique
> {code:java}
> curl -F:nameHint=myuser -Fpwd=password -FpwdConfirm=password
> http://localhost:8080/system/userManager/user.create.html{code}
> 4. *":nameHint@ValueFrom"* - value is the name of another submitted parameter
> whose value is filtered, trimmed and made unique
> {code:java}
> curl -F:nameHint@ValueFrom=displayName -FdisplayName=myuser -Fpwd=password
> -FpwdConfirm=password
> http://localhost:8080/system/userManager/user.create.html{code}
> 5. otherwise, try the value of any server-side configured
> *"principalNameHints"* parameters to treat as a hint that is filtered,
> trimmed and made unique
> {code:java}
> curl -FdisplayName=myuser -Fpwd=password -FpwdConfirm=password
> http://localhost:8080/system/userManager/user.create.html{code}
>
> One other benefit of having an extensible way of autogenerating the
> principalName values is that one could provide an implementation that
> generates randomized principalName values. This should make it more difficult
> to script the enumeration of the valid user names.
>
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