Générer une image mise en avant optimisée pour un article avec Stable Diffusion et TinyPNG

Cette Persisted GraphQL query utilise l'IA générative Stable Diffusion pour produire des images pour les articles sans image mise en avant.

Elle vérifie d'abord si un article a une image mise en avant. Si ce n'est pas le cas, elle en crée une en appelant le service d'IA générative de Stable Diffusion. Nous devons fournir la clé API pour l'utiliser.

Comme les images générées par l'IA générative ne sont pas optimisées pour le web, la requête peut également envoyer l'image nouvellement générée à TinyPNG pour la compresser. Nous devons fournir la clé API pour l'utiliser.

Enfin, la requête crée un nouvel élément média avec l'image et le définit comme image mise en avant de l'article.

query InitializeVariables(
  $tinyPngAPIKey: String
)
  @configureWarningsOnExportingDuplicateVariable(enabled: false)
{
  isFeaturedImageMissing: _echo(value: false)
    @export(as: "isFeaturedImageMissing")
    @remove
 
  isPostTitleNotEmpty: _echo(value: false)
    @export(as: "isPostTitleNotEmpty")
    @remove
 
  generatedImageURL: _echo(value: null)
    @export(as: "generatedImageURL")
    @remove
 
  isImageGenerated: _echo(value: false)
    @export(as: "isImageGenerated")
    @remove
 
  mimeType: _echo(value: null)
    @export(as: "mimeType")
    @remove
 
  isMediaItemCreated: _echo(value: false)
    @export(as: "isMediaItemCreated")
    @remove
 
  useTinyPng: _notEmpty(value: $tinyPngAPIKey)
    @export(as: "useTinyPng")
    @remove
}
 
query ExportPostData(
  $postID: ID!
)
  @depends(on: "InitializeVariables")
{
  post(by: { id: $postID }, status: any) {
    hasFeaturedImage
    isFeaturedImageMissing: hasFeaturedImage
      @boolOpposite
      @export(as: "isFeaturedImageMissing")
    title
      @export(as: "postTitle")
    rawTitle
      @remove
    isPostTitleNotEmpty: _notEmpty(value: $__rawTitle)
      @export(as: "isPostTitleNotEmpty")
    mediaItemFilename: rawTitle
      @default(value: "untitled", condition: IS_EMPTY)
      @strLowerCase
      @strSubstr(offset: 0, length: 20)
      @export(as: "filename")
      @remove
  }
}
 
query GenerateImageUsingStableDiffusion(
  $stableDiffusionAPIKey: String!
  $width: Int! = 1024
  $height: Int! = 1024
)
  @depends(on: "ExportPostData")
  @include(if: $isFeaturedImageMissing)
  @include(if: $isPostTitleNotEmpty)
{
  stableDiffusionResponse: _sendJSONObjectItemHTTPRequest(input: {
    url: "https://stablediffusionapi.com/api/v3/text2img",
    method: POST,
    options: {
      json: {
        key: $stableDiffusionAPIKey
        prompt: $postTitle,
        width: $width
        height: $height
        samples: 1
      }
    }
  })
    @underJSONObjectProperty(by: { key: "output" })
      @underArrayItem(index: 0)
        @export(as: "generatedImageURL")
  
  stableDiffusionImageCaption: _sprintf(
    string: "Image created by Stable Diffusion using prompt: '%s'",
    values: [$postTitle]
  )
    @export(as: "imageCaption")
  
  stableDiffusionMediaItemFilename: _sprintf(
    string: "%s.png",
    values: [$filename]
  )
    @export(as: "filename")
}
 
query CheckIsImageGenerated
  @depends(on: "GenerateImageUsingStableDiffusion")
  @include(if: $isFeaturedImageMissing)
  @include(if: $isPostTitleNotEmpty)
{
  isImageGenerated: _notEmpty(value: $generatedImageURL)
    @export(as: "isImageGenerated")
}
 
query MaybeCompressGeneratedImage(
  $tinyPngAPIKey: String
)
  @depends(on: "CheckIsImageGenerated")
  @include(if: $isImageGenerated)
  @include(if: $useTinyPng)
{
  compressedImageResponse: _sendHTTPRequest(input: {
    url: "https://api.tinify.com/shrink",
    method: POST,
    options: {
      auth: {
        password: $tinyPngAPIKey
      },
      headers: [
        {
          name: "Content-Type",
          value: "application/json"
        }
      ],
      json: {
        source: {
          url: $generatedImageURL
        }
      }
    }
  }) {
    body
      @remove
    bodyJSONObject: _strDecodeJSONObject(string: $__body)
 
    mimeType: _objectProperty(
      object: $__bodyJSONObject
      by: { path: "output.type" }
    )
      @export(as: "mimeType")
 
    generatedImageURL: header(name: "Location")
      @export(as: "generatedImageURL")
  }
}
 
mutation CreateMediaItemFromGeneratedImage
  @depends(on: "MaybeCompressGeneratedImage")
  @include(if: $isImageGenerated)
{
  createMediaItem(input: {
    from: {
      url: {
        source: $generatedImageURL
        filename: $filename
      }
    }
    title: $postTitle
    caption: $imageCaption
    altText: $postTitle
    mimeType: $mimeType
  }) {
    mediaItemID
      @export(as: "mediaItemID")
    isMediaItemCreated: _notNull(value: $__mediaItemID)
      @export(as: "isMediaItemCreated")
      @remove
 
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    mediaItem {
      altText
      caption
      mimeType
      slug
      src
      title
    }
  }
}
 
mutation GenerateOptimizedPostFeaturedImageUsingStableDiffusion(
  $postID: ID!
)
  @depends(on: "CreateMediaItemFromGeneratedImage")
  @include(if: $isMediaItemCreated)
{
  setFeaturedImageOnCustomPost(input: {
    customPostID: $postID
    mediaItemBy: { id: $mediaItemID }
  }) {
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    customPost {
      __typename
      ...on CustomPost {
        featuredImage {
          id
          altText
          caption
          mimeType
          slug
          src
          title
        }
      }
    }
  }
}