photoprism/internal/api/photo_thumb.go

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package api
import (
"net/http"
"path/filepath"
"time"
"github.com/gin-gonic/gin"
"github.com/photoprism/photoprism/internal/photoprism"
"github.com/photoprism/photoprism/internal/query"
"github.com/photoprism/photoprism/internal/service"
"github.com/photoprism/photoprism/internal/thumb"
"github.com/photoprism/photoprism/pkg/fs"
"github.com/photoprism/photoprism/pkg/txt"
)
// GET /api/v1/t/:hash/:token/:type
//
// Parameters:
// hash: string sha1 file hash
// token: string url security token, see config
// type: string thumb type, see thumb.Types
func GetThumb(router *gin.RouterGroup) {
router.GET("/t/:hash/:token/:type", func(c *gin.Context) {
if InvalidPreviewToken(c) {
c.Data(http.StatusForbidden, "image/svg+xml", brokenIconSvg)
return
}
start := time.Now()
conf := service.Config()
fileHash := c.Param("hash")
typeName := c.Param("type")
download := c.Query("download") != ""
thumbType, ok := thumb.Types[typeName]
if !ok {
log.Errorf("thumbs: invalid type %s", txt.Quote(typeName))
c.Data(http.StatusOK, "image/svg+xml", photoIconSvg)
return
}
if thumbType.ExceedsSize() && !conf.ThumbUncached() {
typeName, thumbType = thumb.Find(conf.ThumbSize())
if typeName == "" {
log.Errorf("thumbs: invalid size %d", conf.ThumbSize())
c.Data(http.StatusOK, "image/svg+xml", photoIconSvg)
return
}
}
cache := service.ThumbCache()
cacheKey := CacheKey("thumbs", fileHash, typeName)
if cacheData, ok := cache.Get(cacheKey); ok {
log.Debugf("api: cache hit for %s [%s]", cacheKey, time.Since(start))
cached := cacheData.(ThumbCache)
if !fs.FileExists(cached.FileName) {
log.Errorf("thumbs: %s not found", fileHash)
c.Data(http.StatusOK, "image/svg+xml", brokenIconSvg)
return
}
AddThumbCacheHeader(c)
if c.Query("download") != "" {
c.FileAttachment(cached.FileName, cached.ShareName)
} else {
c.File(cached.FileName)
}
return
}
// Return existing thumbs straight away.
if !download {
if fileName, err := thumb.Filename(fileHash, conf.ThumbPath(), thumbType.Width, thumbType.Height, thumbType.Options...); err == nil && fs.FileExists(fileName) {
c.File(fileName)
return
}
}
// Query index for file infos.
f, err := query.FileByHash(fileHash)
if err != nil {
c.Data(http.StatusOK, "image/svg+xml", photoIconSvg)
return
}
// Find fallback if file is not a JPEG image.
if f.NoJPEG() {
f, err = query.FileByPhotoUID(f.PhotoUID)
if err != nil {
c.Data(http.StatusOK, "image/svg+xml", fileIconSvg)
return
}
}
// Return SVG icon as placeholder if file has errors.
if f.FileError != "" {
c.Data(http.StatusOK, "image/svg+xml", brokenIconSvg)
return
}
fileName := photoprism.FileName(f.FileRoot, f.FileName)
if !fs.FileExists(fileName) {
log.Errorf("thumbs: file %s is missing", txt.Quote(f.FileName))
c.Data(http.StatusOK, "image/svg+xml", brokenIconSvg)
// Set missing flag so that the file doesn't show up in search results anymore.
logError("thumbs", f.Update("FileMissing", true))
if f.AllFilesMissing() {
log.Infof("thumbs: deleting photo, all files missing for %s", txt.Quote(f.FileName))
logError("thumbs", f.RelatedPhoto().Delete(false))
}
return
}
// Use original file if thumb size exceeds limit, see https://github.com/photoprism/photoprism/issues/157
if thumbType.ExceedsSizeUncached() && c.Query("download") == "" {
log.Debugf("thumbs: using original, size exceeds limit (width %d, height %d)", thumbType.Width, thumbType.Height)
AddThumbCacheHeader(c)
c.File(fileName)
return
}
var thumbnail string
if conf.ThumbUncached() || thumbType.OnDemand() {
thumbnail, err = thumb.FromFile(fileName, f.FileHash, conf.ThumbPath(), thumbType.Width, thumbType.Height, f.FileOrientation, thumbType.Options...)
} else {
thumbnail, err = thumb.FromCache(fileName, f.FileHash, conf.ThumbPath(), thumbType.Width, thumbType.Height, thumbType.Options...)
}
if err != nil {
log.Errorf("thumbs: %s", err)
c.Data(http.StatusOK, "image/svg+xml", brokenIconSvg)
return
} else if thumbnail == "" {
log.Errorf("thumbs: %s has empty thumb name - bug?", filepath.Base(fileName))
c.Data(http.StatusOK, "image/svg+xml", brokenIconSvg)
return
}
cache.SetDefault(cacheKey, ThumbCache{thumbnail, f.ShareBase(0)})
log.Debugf("cached %s [%s]", cacheKey, time.Since(start))
AddThumbCacheHeader(c)
if download {
c.FileAttachment(thumbnail, f.DownloadName(DownloadName(c), 0))
} else {
c.File(thumbnail)
}
})
}