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	Add "Allow edits from maintainer" feature (#18002)
Adds a feature [like GitHub has](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork) (step 7). If you create a new PR from a forked repo, you can select (and change later, but only if you are the PR creator/poster) the "Allow edits from maintainers" option. Then users with write access to the base branch get more permissions on this branch: * use the update pull request button * push directly from the command line (`git push`) * edit/delete/upload files via web UI * use related API endpoints You can't merge PRs to this branch with this enabled, you'll need "full" code write permissions. This feature has a pretty big impact on the permission system. I might forgot changing some things or didn't find security vulnerabilities. In this case, please leave a review or comment on this PR. Closes #17728 Co-authored-by: 6543 <6543@obermui.de>
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		@@ -283,6 +283,15 @@ func reqRepoWriter(unitTypes ...unit.Type) func(ctx *context.APIContext) {
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	}
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}
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// reqRepoBranchWriter user should have a permission to write to a branch, or be a site admin
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func reqRepoBranchWriter(ctx *context.APIContext) {
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	options, ok := web.GetForm(ctx).(api.FileOptionInterface)
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	if !ok || (!ctx.Repo.CanWriteToBranch(ctx.Doer, options.Branch()) && !ctx.IsUserSiteAdmin()) {
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		ctx.Error(http.StatusForbidden, "reqRepoBranchWriter", "user should have a permission to write to this branch")
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		return
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	}
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}
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// reqRepoReader user should have specific read permission or be a repo admin or a site admin
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func reqRepoReader(unitType unit.Type) func(ctx *context.APIContext) {
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	return func(ctx *context.APIContext) {
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@@ -1021,10 +1030,10 @@ func Routes() *web.Route {
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					m.Get("", repo.GetContentsList)
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					m.Get("/*", repo.GetContents)
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					m.Group("/*", func() {
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						m.Post("", bind(api.CreateFileOptions{}), repo.CreateFile)
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						m.Put("", bind(api.UpdateFileOptions{}), repo.UpdateFile)
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						m.Delete("", bind(api.DeleteFileOptions{}), repo.DeleteFile)
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					}, reqRepoWriter(unit.TypeCode), reqToken())
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						m.Post("", bind(api.CreateFileOptions{}), reqRepoBranchWriter, repo.CreateFile)
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						m.Put("", bind(api.UpdateFileOptions{}), reqRepoBranchWriter, repo.UpdateFile)
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						m.Delete("", bind(api.DeleteFileOptions{}), reqRepoBranchWriter, repo.DeleteFile)
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					}, reqToken())
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				}, reqRepoReader(unit.TypeCode))
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				m.Get("/signing-key.gpg", misc.SigningKey)
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				m.Group("/topics", func() {
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