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101 lines
3.8 KiB
Markdown
101 lines
3.8 KiB
Markdown
# Config
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!!! info "Design Document"
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This is a design document, explaining the design and vision for a HedgeDoc 2
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feature. It is not a user guide and may or may not be fully implemented.
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The configuration of HedgeDoc 2 is handled entirely by environment variables.
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Most of these variables are prefixed with `HD_` (for HedgeDoc).
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NestJS - the framework we use - is reading the variables from the environment and also from
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the `.env` file in the root of the project.
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## How the config code works
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The config of HedgeDoc is split up into **nine** different modules:
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`app.config.ts`
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: General configuration of the app
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`auth.config.ts`
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: Which authentication providers are available and which options are set
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`csp.config.ts`
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: Configuration for [Content Security Policy][csp]
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`customization.config.ts`
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: Config to customize the instance and set instance specific links
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`database.config.ts`
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: Which database should be used
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`external-services.config.ts`
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: Which external services are activated and where can they be called
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`hsts.config.ts`
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: Configuration for [HTTP Strict-Transport-Security][hsts]
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`media.config.ts`
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: Where media files are being stored
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`note.config.ts`
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: Configuration for notes
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Each of those files (except `auth.config.ts` which is discussed later) consists of three parts:
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1. An interface
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2. A Joi schema
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3. A default export
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### Interface
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The interface just describes which options the configuration has and how the rest of HedgeDoc can
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use them. All enums that are used in here are put in their own files with the extension `.enum.ts`.
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### Joi Schema
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We use [Joi][joi] to validate each provided configuration to make sure the configuration of the user
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is sound and provides helpful error messages otherwise.
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The most important part here is that each value ends with `.label()`. This names the
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environment variable that corresponds to each config option. It's very important that each config
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option is assigned the correct label to have meaningful error messages that benefit the user.
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Everything else about how Joi works and how you should write schemas can
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be read in [their documentation][joi-doc].
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### A default export
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The default exports are used by NestJS to provide the values to the rest of the application.
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We mostly do four things here:
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1. Populate the config interface with environment variables, creating the config object.
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2. Validate the config object against the Joi schema.
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3. Polish the error messages from Joi and present them to the user (if any occur).
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4. Return the validated config object.
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## How `auth.config.ts` works
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Because it's possible to configure some authentication providers multiple times
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(e.g. multiple LDAPs or GitLabs), we use user defined environment variable names.
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With the user defined names it's not possible to put the correct labels in the schema
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or build the config objects as we do in every other file.
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Therefore, we have two big extra steps in the default export:
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1. To populate the config object we have some code at the top of the default export to gather all
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configured variables into arrays.
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2. The error messages are piped into the util method `replaceAuthErrorsWithEnvironmentVariables`.
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This replaces the error messages of the form `gitlab[0].providerName`
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with `HD_AUTH_GITLAB_<nameOfFirstGitlab>_PROVIDER_NAME`. For this the util function gets
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the error, the name of the config option (e.g `'gitlab'`), the approriate prefix
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(e.g. `'HD_AUTH_GITLAB_'`), and an array of the user defined names.
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## Mocks
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Some config files also have a `.mock.ts` file which defines the configuration for the e2e tests.
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Those files just contain the default export and return the mock config object.
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[csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
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[hsts]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
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[joi]: https://joi.dev/
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[joi-doc]: https://joi.dev/api
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