62 lines
1.8 KiB
Swift
62 lines
1.8 KiB
Swift
import Foundation
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protocol PageHeadInfoProvider {
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var author: String { get }
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var linkPreviewTitle: String { get }
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var linkPreviewDescription: String { get }
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var linkPreviewImage: String? { get }
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var customHeadContent: String? { get }
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}
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struct PageHeadInfo: PageHeadInfoProvider {
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let author: String
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let linkPreviewTitle: String
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let linkPreviewDescription: String
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let linkPreviewImage: String?
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let customHeadContent: String?
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}
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struct PageHeadGenerator {
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let template: PageHeadTemplate
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let imageProcessor: ImageProcessor
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init(factory: TemplateFactory, imageProcessor: ImageProcessor) {
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self.template = factory.pageHead
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self.imageProcessor = imageProcessor
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}
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func generate(page: PageHeadInfoProvider) throws -> String {
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var content = [PageHeadTemplate.Key : String]()
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content[.author] = page.author
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content[.title] = page.linkPreviewTitle
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content[.description] = page.linkPreviewDescription
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if let image = page.linkPreviewImage {
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// Note: Generate separate destination link for the image,
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// since we don't want a single large image for thumbnails.
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// Warning: Link preview source path must be relative to root
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let linkPreviewImagePath = image.insert("-link", beforeLast: ".")
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try imageProcessor.requireImage(
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source: image,
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destination: linkPreviewImagePath,
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width: Site.linkPreviewDesiredImageWidth)
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#warning("Make link preview image path absolute")
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content[.image] = "<meta property=\"og:image\" content=\"\(linkPreviewImagePath)\" />"
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}
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content[.customPageContent] = page.customHeadContent
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return template.generate(content)
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}
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}
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