137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
// Define the options for Open
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package fs
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import (
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"fmt"
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"net/http"
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"strconv"
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)
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// OpenOption is an interface describing options for Open
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type OpenOption interface {
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fmt.Stringer
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// Header returns the option as an HTTP header
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Header() (key string, value string)
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// Mandatory returns whether this option can be ignored or not
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Mandatory() bool
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}
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// RangeOption defines an HTTP Range option with start and end. If
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// either start or end are < 0 then they will be omitted.
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type RangeOption struct {
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Start int64
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End int64
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}
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// Header formats the option as an http header
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func (o *RangeOption) Header() (key string, value string) {
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key = "Range"
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value = "bytes="
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if o.Start >= 0 {
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value += strconv.FormatInt(o.Start, 64)
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}
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value += "-"
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if o.End >= 0 {
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value += strconv.FormatInt(o.End, 64)
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}
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return key, value
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}
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// String formats the option into human readable form
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func (o *RangeOption) String() string {
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return fmt.Sprintf("RangeOption(%d,%d)", o.Start, o.End)
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}
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// Mandatory returns whether the option must be parsed or can be ignored
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func (o *RangeOption) Mandatory() bool {
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return false
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}
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// SeekOption defines an HTTP Range option with start only.
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type SeekOption struct {
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Offset int64
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}
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// Header formats the option as an http header
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func (o *SeekOption) Header() (key string, value string) {
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key = "Range"
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value = fmt.Sprintf("bytes=%d-", o.Offset)
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return key, value
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}
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// String formats the option into human readable form
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func (o *SeekOption) String() string {
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return fmt.Sprintf("SeekOption(%d)", o.Offset)
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}
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// Mandatory returns whether the option must be parsed or can be ignored
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func (o *SeekOption) Mandatory() bool {
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return true
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}
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// HTTPOption defines a general purpose HTTP option
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type HTTPOption struct {
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Key string
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Value string
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}
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// Header formats the option as an http header
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func (o *HTTPOption) Header() (key string, value string) {
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return o.Key, o.Value
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}
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// String formats the option into human readable form
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func (o *HTTPOption) String() string {
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return fmt.Sprintf("HTTPOption(%q,%q)", o.Key, o.Value)
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}
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// Mandatory returns whether the option must be parsed or can be ignored
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func (o *HTTPOption) Mandatory() bool {
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return false
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}
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// OpenOptionAddHeaders adds each header found in options to the
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// headers map provided the key was non empty.
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func OpenOptionAddHeaders(options []OpenOption, headers map[string]string) {
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for _, option := range options {
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key, value := option.Header()
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if key != "" && value != "" {
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headers[key] = value
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}
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}
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}
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// OpenOptionHeaders adds each header found in options to the
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// headers map provided the key was non empty.
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//
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// It returns a nil map if options was empty
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func OpenOptionHeaders(options []OpenOption) (headers map[string]string) {
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if len(options) == 0 {
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return nil
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}
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headers = make(map[string]string, len(options))
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OpenOptionAddHeaders(options, headers)
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return headers
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}
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// OpenOptionAddHTTPHeaders Sets each header found in options to the
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// http.Header map provided the key was non empty.
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func OpenOptionAddHTTPHeaders(headers http.Header, options []OpenOption) {
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for _, option := range options {
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key, value := option.Header()
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if key != "" && value != "" {
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headers.Set(key, value)
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}
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}
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}
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// check interface
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var (
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_ OpenOption = (*RangeOption)(nil)
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_ OpenOption = (*SeekOption)(nil)
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_ OpenOption = (*HTTPOption)(nil)
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)
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