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123 lines
2.9 KiB
123 lines
2.9 KiB
package thumb
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import (
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"context"
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"errors"
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"fmt"
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model "github.com/cloudreve/Cloudreve/v3/models"
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"github.com/cloudreve/Cloudreve/v3/pkg/util"
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"io"
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"os"
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"path/filepath"
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"reflect"
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"sort"
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"strconv"
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)
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// Generator generates a thumbnail for a given reader.
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type Generator interface {
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// Generate generates a thumbnail for a given reader. Src is the original file path, only provided
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// for local policy files.
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Generate(ctx context.Context, file io.Reader, src string, name string, options map[string]string) (*Result, error)
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// Priority of execution order, smaller value means higher priority.
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Priority() int
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// EnableFlag returns the setting name to enable this generator.
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EnableFlag() string
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}
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type Result struct {
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Path string
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Continue bool
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Cleanup []func()
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}
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type (
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GeneratorType string
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GeneratorList []Generator
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)
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var (
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Generators = GeneratorList{}
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ErrPassThrough = errors.New("pass through")
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ErrNotAvailable = fmt.Errorf("thumbnail not available: %w", ErrPassThrough)
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)
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func (g GeneratorList) Len() int {
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return len(g)
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}
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func (g GeneratorList) Less(i, j int) bool {
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return g[i].Priority() < g[j].Priority()
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}
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func (g GeneratorList) Swap(i, j int) {
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g[i], g[j] = g[j], g[i]
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}
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// RegisterGenerator registers a thumbnail generator.
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func RegisterGenerator(generator Generator) {
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Generators = append(Generators, generator)
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sort.Sort(Generators)
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}
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func (p GeneratorList) Generate(ctx context.Context, file io.Reader, src, name string, options map[string]string) (*Result, error) {
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inputFile, inputSrc, inputName := file, src, name
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for _, generator := range p {
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if model.IsTrueVal(options[generator.EnableFlag()]) {
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res, err := generator.Generate(ctx, inputFile, inputSrc, inputName, options)
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if errors.Is(err, ErrPassThrough) {
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util.Log().Debug("Failed to generate thumbnail using %s for %s: %s, passing through to next generator.", reflect.TypeOf(generator).String(), name, err)
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continue
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}
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if res.Continue {
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util.Log().Debug("Generator %s for %s returned continue, passing through to next generator.", reflect.TypeOf(generator).String(), name)
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// defer cleanup funcs
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for _, cleanup := range res.Cleanup {
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defer cleanup()
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}
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// prepare file reader for next generator
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intermediate, err := os.Open(res.Path)
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if err != nil {
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return nil, fmt.Errorf("failed to open intermediate thumb file: %w", err)
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}
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defer intermediate.Close()
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inputFile = intermediate
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inputSrc = res.Path
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inputName = filepath.Base(res.Path)
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continue
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}
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return res, err
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}
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}
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return nil, ErrNotAvailable
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}
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func (p GeneratorList) Priority() int {
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return 0
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}
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func (p GeneratorList) EnableFlag() string {
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return ""
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}
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func thumbSize(options map[string]string) (uint, uint) {
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w, h := uint(400), uint(300)
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if wParsed, err := strconv.Atoi(options["thumb_width"]); err == nil {
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w = uint(wParsed)
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}
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if hParsed, err := strconv.Atoi(options["thumb_height"]); err == nil {
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h = uint(hParsed)
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}
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return w, h
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}
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