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27 lines
1.2 KiB
Markdown
Executable file
27 lines
1.2 KiB
Markdown
Executable file
---
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title: Fingerprint
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linkTitle: Fingerprinting and SRI hashing
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description: Process a given resource, adding a hash string of the resource's content.
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categories: [asset management]
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keywords: []
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menu:
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docs:
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parent: hugo-pipes
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weight: 100
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weight: 100
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signature: ["resources.Fingerprint RESOURCE [ALGORITHM]", "fingerprint RESOURCE [ALGORITHM]"]
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---
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## Usage
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Fingerprinting and [SRI](https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity) can be applied to any asset file using `resources.Fingerprint` which takes two arguments, the resource object and an optional [hash algorithm](https://en.wikipedia.org/wiki/Secure_Hash_Algorithms).
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The default hash algorithm is `sha256`. Other available algorithms are `sha384` and (as of Hugo `0.55`) `sha512` and `md5`.
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Any so processed asset will bear a `.Data.Integrity` property containing an integrity string, which is made up of the name of the hash algorithm, one hyphen and the base64-encoded hash sum.
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```go-html-template
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{{ $js := resources.Get "js/global.js" }}
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{{ $secureJS := $js | resources.Fingerprint "sha512" }}
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<script src="{{ $secureJS.Permalink }}" integrity="{{ $secureJS.Data.Integrity }}"></script>
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```
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