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phpGACL汉语言手册（七）

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Jun 13, 2016 pm 01:04 PM

acl

phpGACL中文手册（七）

解决冲突

如果我们把 Chewie 加入到工程师组中会出现什么情况呢？缺省：全部拒绝
千年隼号乘客
├ ─ 船员 [ 允许：全部 ]
│├─Han
│├─Chewie [ 拒绝：发动机室 ]
│└─Lando
├─ 乘客 [ 允许：休息室 ]
│ ├─ 绝地战士 [ 允许：驾驶室 ]
││ ├─ Obi-wan
││ └─ Luke [ 允许：武器室 ]
│ ├─R2D2 [ 允许：发动机室 ]
│ └─C3PO
└─ 工程师 [ 允许：发动机室，武器室 ]
├─Han
├─R2D2
├─Hontook
└─Chewie

这就使 Chewie 到发动机室的权限产生了歧义，因为从根沿树遍历到 Chewie 出现两条路径。如果飞船的计算机沿其中一条路径（船员路径），将得到"拒绝进入发动机室"的结论。而沿另一条路径（工程师路径）则会得到"允许进入发动机室"的结论，那么他到底有没权进入发动机室呢？

当你添加或编辑分属多组的 ARO 对象使之对某个 ACO 对象的权限发生歧义时， phpGACL 系统将警告你。但它会最近优先以便解决冲突。

如果我们现在问 phpGACL"Chewie 有权进入发动机室吗？"那么返回的结果是最近 ACL 被修改的内容（这是 phpGACL 的策略）。在上面这个例子中，返回的结果是"允许"，因为被工程师组指定的"允许：发动机室，武器室"权限的时间要比被船员组指定的"拒绝：发动机室"权限时间要近。

当有歧义的权限设定在 ACL 列表中存在时，该 ACL 列表被称为不一致。不一致的 ACL 列表是非常危险的，如果你允许你的 ACL 列表保持在这种状况下的话，你可能会在不经意之下把权限赋给不恰当的人。当 phpGACL 警告你 ACL 列表不一致时，最好还是去解决冲突以尽可能恢复其一致性。

为解决上例的冲突，我们可以作以下任何一步：

删除在船员组中 Chewie 的"拒绝：发动机室"指令
添加在工程师组中 Chewie 的"拒绝：发动机室"指令
在工程师组中删除 Chewie ，因为 Han 无论如何不认为他作工程师是一件值得考虑的事

Han 选了第三种方案，将 Chewie 从工程师组中删除

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