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cdk/node_modules/aws-cdk-lib/region-info/README.md
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# AWS Region-Specific Information Directory
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## Usage
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Some information used in CDK Applications differs from one AWS region to
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another, such as service principals used in IAM policies, S3 static website
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endpoints, ...
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### The `RegionInfo` class
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The library offers a simple interface to obtain region specific information in
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the form of the `RegionInfo` class. This is the preferred way to interact with
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the regional information database:
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```ts
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// Get the information for "eu-west-1":
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const region = regionInfo.RegionInfo.get('eu-west-1');
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// Access attributes:
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region.s3StaticWebsiteEndpoint; // s3-website-eu-west-1.amazonaws.com
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```
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The `RegionInfo` layer is built on top of the Low-Level API, which is described
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below and can be used to register additional data, including user-defined facts
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that are not available through the `RegionInfo` interface.
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### Low-Level API
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This library offers a primitive database of such information so that CDK
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constructs can easily access regional information. The `FactName` class provides
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a list of known fact names, which can then be used with the `RegionInfo` to
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retrieve a particular value:
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```ts
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const staticWebsite = regionInfo.Fact.find(
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'ap-northeast-1',
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regionInfo.FactName.S3_STATIC_WEBSITE_ENDPOINT
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);
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// => s3-website-ap-northeast-1.amazonaws.com
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```
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## Supplying new or missing information
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As new regions are released, it might happen that a particular fact you need is
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missing from the library. In such cases, the `Fact.register` method can be used
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to inject FactName into the database:
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```ts
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class MyFact implements regionInfo.IFact {
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public readonly region = 'bermuda-triangle-1';
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public readonly name = regionInfo.FactName.S3_STATIC_WEBSITE_ENDPOINT;
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public readonly value = 's3-website.bermuda-triangle-1.nowhere.com';
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}
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regionInfo.Fact.register(new MyFact());
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```
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## Overriding incorrect information
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In the event information provided by the library is incorrect, it can be
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overridden using the same `Fact.register` method demonstrated above, simply
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adding an extra boolean argument:
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```ts
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class MyFact implements regionInfo.IFact {
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public readonly region = 'us-east-1';
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public readonly name = regionInfo.FactName.S3_STATIC_WEBSITE_ENDPOINT;
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public readonly value = 'the-correct-endpoint.amazonaws.com';
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}
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regionInfo.Fact.register(new MyFact(), true /* Allow overriding information */);
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```
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If you happen to have stumbled upon incorrect data built into this library, it
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is always a good idea to report your findings in a [GitHub issue], so we can fix
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it for everyone else!
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[GitHub issue]: https://github.com/aws/aws-cdk/issues
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---
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This module is part of the [AWS Cloud Development Kit](https://github.com/aws/aws-cdk) project.
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