68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
package photo
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import (
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"fmt"
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"os"
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"path/filepath"
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"code.nonshy.com/nonshy/website/pkg/config"
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"code.nonshy.com/nonshy/website/pkg/log"
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"github.com/google/uuid"
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)
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// Functions that deal with giving photos their:
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// - Filename
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// - URL prefix (/static/photos or maybe CDN?)
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/*
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NewFilename generates a Filename with an extension (".jpg").
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The filename is a random UUID string, with a couple of directory
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paths in front consisting of the first few characters (to keep
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directory sizes under control over time). Example:
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"91/b9/91b908db-4007-41b2-bbca-71a6526e59aa.jpg"
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*/
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func NewFilename(ext string) string {
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basename := uuid.New().String()
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first2 := basename[:2]
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next2 := basename[2:4]
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log.Debug("photo.NewFilename: UUID %s first2 %d next2 %d", basename, first2, next2)
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return fmt.Sprintf(
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"%s/%s/%s%s",
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first2, next2, basename, ext,
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)
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}
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// DiskPath returns the local disk path to a photo Filename.
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func DiskPath(filename string) string {
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return config.PhotoDiskPath + "/" + filename
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}
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// URLPath returns the public HTTP path to a photo. May be relative like "/static/photos" or could be a full CDN.
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func URLPath(filename string) string {
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return config.PhotoWebPath + "/" + filename
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}
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/*
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EnsurePath makes sure the local './web/static/photos/' path is ready
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to write an image to, taking into account path parameters in the
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image filename.
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The filename is like from NewFilename(), just the photo Filename portion.
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It is appended to the PhotoDiskPath.
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Returns the full path ("./web/static/photos/...") ready for the caller
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to use it for writing.
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*/
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func EnsurePath(filename string) (string, error) {
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fullpath := DiskPath(filename)
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dir := filepath.Dir(fullpath)
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log.Debug("photo.EnsurePath: check that %s exists", dir)
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if err := os.MkdirAll(dir, 0755); err != nil {
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return fullpath, fmt.Errorf("EnsurePath: %s", err)
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} else {
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return fullpath, nil
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}
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}
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