54 lines
1.7 KiB
Markdown
54 lines
1.7 KiB
Markdown
---
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title: "Browser libraries"
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description: "API documenttion for mCaptcha WASM library"
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lead: ""
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date: 2021-03-11
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lastmod: 2021-03-11 10:27
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draft: false
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images: []
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menu:
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docs:
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parent: "API"
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weight: 110
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toc: true
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---
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The browser part of mCaptcha is divided into three components.
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- Glue code
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- Widget program
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- Proof-of-Work libraries(WebAssembly and JavaScript polyfill)
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## Glue code
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This is the code that links mCaptcha with your website's frontend code.
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It creates an `iframe` containing the mCaptcha widget and injects the
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received verification proof token into a hidden input field.
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Support is available for various frameworks, see
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[`mCaptcha/glue`](https://github.com/mCaptcha/glue) for the full list.
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For frameworks without official support, a low-level library,
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[`@mcaptcha/core-glue`](https://www.npmjs.com/package/@mcaptcha/core-glue),
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can be used to implement support.
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## Widget Program
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This part is served by the mCaptcha backend. It fetches PoW config from
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the backend, generates proof and submits it for verification. If
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verification is successful, it sends a message containing the
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verification proof token to the parent window, assuming it's loaded as
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an `iframe`.
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- Source code:
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[`mCaptcha/mCaptcha/templates/widget`](https://github.com/mCaptcha/mCaptcha/tree/master/templates/widget)
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WebAssembly library which generates Proofs of Work for mCaptcha systems.
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## Proof-of-Work(PoW) library
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WebAssembly bindings([`mCaptcha/pow_wasm`](https://github.com/mCaptcha/pow_wasm)) are available for the main rust library([`mCaptcha/pow_sha256`](https://github.com/mCaptcha/pow_sha256)).
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For browsers without support WebAssembly, a
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polyfill([`pow_sha256-polyfill`](https://github.com/mCaptcha/pow_sha256-polyfill))
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is available.
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