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Using content attachments

Content attachments allow a GitHub App to provide more information in GitHub for URLs that link to registered domains. GitHub renders the information provided by the app under the URL in the body or comment of an issue or pull request.

本文内容

注:内容附件 API 目前处于公测阶段,仅用于 GitHub 应用程序。 在此期间,功能和要求可能会随时更改。

About content attachments

A GitHub App can register domains that will trigger content_reference events. When someone includes a URL that links to a registered domain in the body or comment of an issue or pull request, the app receives the content_reference webhook. You can use content attachments to visually provide more context or data for the URL added to an issue or pull request. The URL must be a fully-qualified URL, starting with either http:// or https://. URLs that are part of a markdown link are ignored and don't trigger the content_reference event.

Before you can use the 内容附件 API, you'll need to configure content references for your GitHub App:

  • Give your app Read & write permissions for "Content references."
  • Register up to 5 valid, publicly accessible domains when configuring the "Content references" permission. Do not use IP addresses when configuring content reference domains. You can register a domain name (example.com) or a subdomain (subdomain.example.com).
  • Subscribe your app to the "Content reference" event.

Once your app is installed on a repository, issue or pull request comments in the repository that contain URLs for your registered domains will generate a content reference event. 应用程序必须在发布内容引用 URL 后六小时内创建内容附件。

Content attachments will not retroactively update URLs. It only works for URLs added to issues or pull requests after you configure the app using the requirements outlined above and then someone installs the app on their repository.

See "Creating a GitHub App" or "Editing a GitHub App's permissions" for the steps needed to configure GitHub App permissions and event subscriptions.

Implementing the content attachment flow

The content attachment flow shows you the relationship between the URL in the issue or pull request, the content_reference webhook event, and the REST API endpoint you need to call to update the issue or pull request with additional information:

Step 1. Set up your app using the guidelines outlined in About content attachments. You can also use the Probot App example to get started with content attachments.

Step 2. Add the URL for the domain you registered to an issue or pull request. You must use a fully qualified URL that starts with http:// or https://.

URL added to an issue

Step 3. Your app will receive the content_reference webhook with the action created.

{
  "action": "created",
  "content_reference": {
    "id": 17,
    "node_id": "MDE2OkNvbnRlbnRSZWZlcmVuY2UxNjA5",
    "reference": "errors.ai"
  },
  "repository": {...},
  "sender": {...},
  "installation": {
    "id": 371641,
    "node_id": "MDIzOkludGVncmF0aW9uSW5zdGFsbGF0aW9uMzcxNjQx"
  }
}

Step 4. The app uses the content_reference id, to Create a content attachment using the REST API. You'll also need the installation id to authenticate as a GitHub App installation.

注:要在预览期间访问 内容附件 API,您必须在 Accept 标头中提供自定义媒体类型

application/vnd.github.corsair-preview+json

警告: 在预览期间,API 可能会更改,恕不另行通知。 预览功能不支持用于生产。 如果遇到任何问题,请联系 your site administrator。

The body parameter can contain markdown:

<pre><code class="hljs language-shell">curl -X POST \
  https://api.github.com/content_references/1512/attachments \
  -H 'Accept: application/vnd.github.corsair-preview+json' \
  -H 'Authorization: Bearer $INSTALLATION_TOKEN' \
  -d '{
    "title": "[A-1234] Error found in core/models.py file",
    "body": "You have used an email that already exists for the user_email_uniq field.\n ## DETAILS:\n\nThe (email)=(Octocat@github.com) already exists.\n\n The error was found in core/models.py in get_or_create_user at line 62.\n\n self.save()"
}'</code></pre>

For more information about creating an installation token, see "Authenticating as a GitHub App."

Step 5. You'll see the new content attachment appear under the link in a pull request or issue comment:

Content attached to a reference in an issue

Using content attachments in GraphQL

We provide the node_id in the content_reference webhook event so you can refer to the createContentAttachment mutation in the GraphQL API.

注:要在预览期间访问 内容附件 API,您必须在 Accept 标头中提供自定义媒体类型

application/vnd.github.corsair-preview+json

警告: 在预览期间,API 可能会更改,恕不另行通知。 预览功能不支持用于生产。 如果遇到任何问题,请联系 your site administrator。

例如:

mutation {
  createContentAttachment(input: {
    contentReferenceId: "MDE2OkNvbnRlbnRSZWZlcmVuY2UxNjA1",
    title: "[A-1234] Error found in core/models.py file",
    body:"You have used an email that already exists for the user_email_uniq field.\n ## DETAILS:\n\nThe (email)=(Octocat@github.com) already exists.\n\n The error was found in core/models.py in get_or_create_user at line 62.\n\n self.save()"
  }) {
    contentAttachment {
      ... on ContentAttachment {
        id
        title
        body
      }
    }
  }
}

Example cURL:

curl -X "POST" "https://api.github.com/graphql" \
     -H 'Authorization: Bearer $INSTALLATION_TOKEN' \
     -H 'Accept: application/vnd.github.corsair-preview+json' \
     -H 'Content-Type: application/json; charset=utf-8' \
     -d $'{
  "query": "mutation {\\n  createContentAttachment(input:{contentReferenceId: \\"MDE2OkNvbnRlbnRSZWZlcmVuY2UxNjA1\\", title:\\"[A-1234] Error found in core/models.py file\\", body:\\"You have used an email that already exists for the user_email_uniq field.\n ## DETAILS:\n\nThe (email)=(Octocat@github.com) already exists.\n\n The error was found in core/models.py in get_or_create_user at line 62.\n\n\self.save()\\"}) {\\n    contentAttachment {\\n      id,\\n      title,\\n      body\\n    }\\n  }\\n}"
}'

For more information on node_id, see "Using Global Node IDs."

Example using Probot and GitHub App Manifests

To quickly setup a GitHub App that can use the 内容附件 API, you can use Probot. See "Creating GitHub Apps from a manifest" to learn how Probot uses GitHub App Manifests.

To create a Probot App, follow these steps:

  1. 生成新的 GitHub 应用程序

  2. 打开您创建的项目,自定义 app.yml 文件中的设置。 Subscribe to the content_reference event and enable content_references write permissions:

    
     default_events:
     - content_reference
     # The set of permissions needed by the GitHub App. The format of the object uses
     # the permission name for the key (for example, issues) and the access type for
     # the value (for example, write).
     # Valid values are `read`, `write`, and `none`
     default_permissions:
       content_references: write
    
     content_references:
     - type: domain
       value: errors.ai
     - type: domain
       value: example.org
    
  3. Add this code to the index.js file to handle content_reference events and call the REST API:

    module.exports = app => {
      // Your code here
      app.log('Yay, the app was loaded!')
       app.on('content_reference.created', async context => {
        console.log('Content reference created!', context.payload)
         // Call the "Create a content reference" REST endpoint
        await context.github.request({
          method: 'POST',
          headers: { accept: 'application/vnd.github.corsair-preview+json' },
          url: `/content_references/${context.payload.content_reference.id}/attachments`,
          // Parameters
          title: '[A-1234] Error found in core/models.py file',
          body: 'You have used an email that already exists for the user_email_uniq field.\n ## DETAILS:\n\nThe (email)=(Octocat@github.com) already exists.\n\n The error was found in core/models.py in get_or_create_user at line 62.\n\nself.save()'
        })
      })
    }
    
  4. Run the GitHub App locally. Navigate to localhost:3000, and click the Register GitHub App button:

    注册 Probot GitHub 应用程序

  5. Install the app on a test repository.

  6. Create an issue in your test repository.

  7. Add a comment to the issue you opened that includes the URL you configured in the app.yml file.

  8. Take a look at the issue comment and you'll see an update that looks like this:

    Content attached to a reference in an issue

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