85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package fs
|
|
|
|
import "context"
|
|
|
|
// Metadata represents Object metadata in a standardised form
|
|
//
|
|
// See docs/content/metadata.md for the interpretation of the keys
|
|
type Metadata map[string]string
|
|
|
|
// MetadataHelp represents help for a bit of system metadata
|
|
type MetadataHelp struct {
|
|
Help string
|
|
Type string
|
|
Example string
|
|
ReadOnly bool
|
|
}
|
|
|
|
// MetadataInfo is help for the whole metadata for this backend.
|
|
type MetadataInfo struct {
|
|
System map[string]MetadataHelp
|
|
Help string
|
|
}
|
|
|
|
// Set k to v on m
|
|
//
|
|
// If m is nil, then it will get made
|
|
func (m *Metadata) Set(k, v string) {
|
|
if *m == nil {
|
|
*m = make(Metadata, 1)
|
|
}
|
|
(*m)[k] = v
|
|
}
|
|
|
|
// Merge other into m
|
|
//
|
|
// If m is nil, then it will get made
|
|
func (m *Metadata) Merge(other Metadata) {
|
|
for k, v := range other {
|
|
if *m == nil {
|
|
*m = make(Metadata, len(other))
|
|
}
|
|
(*m)[k] = v
|
|
}
|
|
}
|
|
|
|
// MergeOptions gets any Metadata from the options passed in and
|
|
// stores it in m (which may be nil).
|
|
//
|
|
// If there is no m then metadata will be nil
|
|
func (m *Metadata) MergeOptions(options []OpenOption) {
|
|
for _, opt := range options {
|
|
if metadataOption, ok := opt.(MetadataOption); ok {
|
|
m.Merge(Metadata(metadataOption))
|
|
}
|
|
}
|
|
}
|
|
|
|
// GetMetadata from an ObjectInfo
|
|
//
|
|
// If the object has no metadata then metadata will be nil
|
|
func GetMetadata(ctx context.Context, o ObjectInfo) (metadata Metadata, err error) {
|
|
do, ok := o.(Metadataer)
|
|
if !ok {
|
|
return nil, nil
|
|
}
|
|
return do.Metadata(ctx)
|
|
}
|
|
|
|
// GetMetadataOptions from an ObjectInfo and merge it with any in options
|
|
//
|
|
// If --metadata isn't in use it will return nil
|
|
//
|
|
// If the object has no metadata then metadata will be nil
|
|
func GetMetadataOptions(ctx context.Context, o ObjectInfo, options []OpenOption) (metadata Metadata, err error) {
|
|
ci := GetConfig(ctx)
|
|
if !ci.Metadata {
|
|
return nil, nil
|
|
}
|
|
metadata, err = GetMetadata(ctx, o)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
metadata.MergeOptions(options)
|
|
return metadata, nil
|
|
}
|