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48 lines
1.1 KiB
Markdown
48 lines
1.1 KiB
Markdown
## Permissions
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<!-- TODO(lucacasonato): what are permissions -->
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<!-- TODO(lucacasonato): description of all permissions -->
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### Permissions whitelist
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Deno also allows you to control the granularity of permissions with whitelists.
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This example restricts file system access by whitelisting only the `/usr`
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directory:
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```shell
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$ deno run --allow-read=/usr https://deno.land/std/examples/cat.ts /etc/passwd
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error: Uncaught PermissionDenied: read access to "/etc/passwd", run again with the --allow-read flag
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► $deno$/dispatch_json.ts:40:11
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at DenoError ($deno$/errors.ts:20:5)
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...
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```
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Try it out again with the correct permissions by whitelisting `/etc` instead:
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```shell
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$ deno run --allow-read=/etc https://deno.land/std/examples/cat.ts /etc/passwd
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```
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`--allow-write` works the same as `--allow-read`.
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### Network access:
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_fetch.ts_:
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```ts
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const result = await fetch("https://deno.land/");
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```
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This is an example on how to whitelist hosts/urls:
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```shell
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$ deno run --allow-net=github.com,deno.land fetch.ts
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```
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Allow net calls to any host/url:
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```shell
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$ deno run --allow-net fetch.ts
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```
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