49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
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package viewer
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import (
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"fmt"
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"math"
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"github.com/photoprism/photoprism/internal/thumb"
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)
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// DownloadUrl returns a download url based on hash, api uri, and download token.
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func DownloadUrl(h, apiUri, downloadToken string) string {
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return fmt.Sprintf("%s/dl/%s?t=%s", apiUri, h, downloadToken)
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}
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// ThumbUrl returns a thumbnail url based on hash, thumb name, cdn uri, and preview token.
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func ThumbUrl(h, name, contentUri, previewToken string) string {
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return fmt.Sprintf("%s/t/%s/%s/%s", contentUri, h, previewToken, name)
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}
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// Thumb represents a photo viewer thumbnail.
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type Thumb struct {
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W int `json:"w"`
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H int `json:"h"`
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Src string `json:"src"`
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}
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// NewThumb creates a new photo viewer thumb.
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func NewThumb(w, h int, hash string, s thumb.Size, contentUri, previewToken string) Thumb {
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if s.Width >= w && s.Height >= h {
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// Smaller
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return Thumb{W: w, H: h, Src: ThumbUrl(hash, s.Name.String(), contentUri, previewToken)}
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}
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srcAspectRatio := float64(w) / float64(h)
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maxAspectRatio := float64(s.Width) / float64(s.Height)
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var newW, newH int
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if srcAspectRatio > maxAspectRatio {
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newW = s.Width
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newH = int(math.Round(float64(newW) / srcAspectRatio))
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} else {
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newH = s.Height
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newW = int(math.Round(float64(newH) * srcAspectRatio))
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}
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return Thumb{W: newW, H: newH, Src: ThumbUrl(hash, s.Name.String(), contentUri, previewToken)}
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}
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