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    Blocking CDN Cache Based on Moderation Result

    Last updated: 2024-03-25 15:16:26
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      Overview

      The content moderation feature can automatically block non-compliant files. It only applies to data stored on COS origins rather than data cached on CDN nodes.
      This document describes how to promptly block non-compliant data cached in CDN through SCF and API Gateway.

      Directions

      1. Log in to the SCF console, select Functions, and click Create to create a function.
      2. Select Create from scratch and set the following basic configuration items:
      Function type: Select Event-triggered function.
      Function name: Enter a custom function name.
      Region: Select the region of the bucket with the moderation feature enabled.
      Runtime environment: Select Python 2.7.
      3. Configure the function code as follows:
      Submitting method: Select Local ZIP file or Upload a ZIP pack via COS. You can download the ZIP package here.
      Execution: Enter index.main_handler.
      4. Click Advanced configuration to configure Environment configuration. You can modify all configuration items except the environment variables as needed.
      Resource type: CPU
      MEM: 512 MB
      Initialization timeout period: 65
      Execution timeout period: 30
      Environment variable:
      CI_AUDITING_CALLBACK: Enter the callback address configured in the callback settings of content moderation here. The callback will be performed only if the callback address is set.
      CDN_URL: Set the required CDN address to purge the CDN cache.
      REGION: Set the required region where the bucket resides.
      BUCKET_ID: Set the required bucket ID (i.e., bucket name), which is used to query the image style. Entering an incorrect value will result in an error during style query.
      IMAGE_STYLE_SEPARATORS: Set the image style separator if you want to purge image style. You can enter multiple separators consecutively with no need to separate them.
      CDN_REFRESH_TYPE: Set the image object cache purge method, which is purge by URL by default (that is, only the style will be purged). If you set this variable to path, the cache accessed by image processing parameters will be purged. Note that purge by path will remove files with longer filenames containing this filename. Be sure to configure the above environment variables correctly so that cache purge can work as expected.
      5. Select Execution Role for Permission configuration and click Create execution role to enter the Create custom role page.
      6. Select Serverless Cloud Function (SCF) as the role entity and click Next.
      7. Select the QcloudCDNFullAccess and QcloudCIReadOnlyAccess role policies and click Next.
      8. Name the role and click Complete.
      9. After creating the custom role, go back to the function creation page, refresh the role drop-down list, and select the newly created role.
      10. Click Complete.
      11. Go to the API Gateway console to activate the API Gateway service.
      12. Create an API gateway as instructed in Creating APIs Connecting to the SCF Backend.
      13. Select Publish for Release Environment and click Publish service.
      14. On the content moderation page in the CI console, set callback parameters for image or other target types, and set the address of the API gateway created in the previous step as the callback URL.
      15. After the callback is configured, resource cache in CDN will be automatically purged based on the moderation callback result.
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