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+---
+title: Design Proposals
+weight: 3
+---
+# Pipelines-as-Code Design proposals
+
+{{<section>}}
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+---
+title: Matching multiple URLs to the same Repository CR
+weight: 1
+---
+
+# Matching multiple URLs to the same Repository CR
+
+## Background
+
+The current implementation of the Repository CR allows specifying a single URL
+for the repository. This is limiting in cases where the repository is mirrored
+to multiple URLs. This document proposes a way to allow specifying multiple URLs
+for the same repository.
+
+## Goal
+
+The goal is to allows specifying multiple URLs for the same repository in the
+same namespace. All settings for all repositories are inside a single Repository
+CR.
+
+## Non Goals
+
+- Allowing multiple URLs for the same repository in different namespaces.
+
+## Proposal
+
+- Extend the Repository CR to allow specifying a regexp for the URL.
+- Extend the Repository CR to allow specifying a non-matching regexp.
+- Extend the Pipelines-as-Code webhook to ensure that no other Repo CR
+  configuration match the newly or updated Repository CR.
+
+```yaml
+spec:
+  url: https://github.com/foo/.*
+  non-url: https://github.com/foo/hello-*
+```
+
+This will match all repositories in the `foo` organization except the one
+starting with `hello-*`
+
+- Repository status will have a new field `url` that will show the
+  matched URL.
+
+## Discussion
+
+The full security model of Pipelines-as-Code is based on the assumption that the
+first one wins. Since we don't have a way (or we decided not to for the
+sake of making it simple) to know who is the real owner of a GitHub (or
+others) repository, we assume that the first one that creates the Repository
+is the owner of the repository. It is up to the cluster administrator to make
+sure which team that has access to a namespace have the proper Repository CR
+matching the GitHub Repository.
+
+If we start letting people making a regexp for the URL, we need to make sure
+they are not able to hijack other repositories.
+
+Example scenario:
+
+- User A creates a Repository CR with a regexp for the URL that matches
+  all repositories in the organization.
+- User B creates another Repository CR with a regexp for the URL that as well
+  matches all repositories in the organization with a different syntax (regexp
+  have many ways to express the same thing).
+
+The webhook will need to make sure that when User B create that Repository CR to
+deny it since User A had already have a match for it. It is up to the
+Users/Teams to communicate to have the regexps works (using `non-url` setting
+for example) for some repositories and not the others.
+
+Second scenario:
+
+- User A has created a Repository CR matching URL: <https://github.com/org/repos>
+- User B has a Repository CR matching URL: <https://github.com/org/otherrepos>
+- User A decide to update their Repo CR with: <https://github.com/org/.*>
+
+The webhook will deny User A since we have a repository CR in user B already
+matching the new update.
+
+## CLI
+
+- [ ] The CLI will probably not need to handle such advanced use case, this is up to
+  the user to directly edit the `Repository` CR Yaml.
+
+## UI
+
+- OpenShift Console will need to be updated I believe to be able to show a status for multiple URL match (TBC)
+
+## Tekton Results
+
+- TBD
+
+## Alternatives
+
+We could extend the global `ConfigMap` setting `auto-configure-new-github-repo` to
+only allows a certain regexps and have a `Repository` template.
+
+The problem with this is that:
+
+- It is specific to GitHub
+- The settings is admin level.
+- The Repository CR are not allowed to be customized by the user.
+- The regexps may need to be adjusted and it will only works for a specific
+  scenario.
+
+The advantages is that UI and tools would not need to be adjusted.