Update dependencies
This commit is contained in:
bluepython508
197
vendor/tailscale.com/util/httphdr/httphdr.go
generated
vendored
Normal file
197
vendor/tailscale.com/util/httphdr/httphdr.go
generated
vendored
Normal file
@@ -0,0 +1,197 @@
|
||||
// Copyright (c) Tailscale Inc & AUTHORS
|
||||
// SPDX-License-Identifier: BSD-3-Clause
|
||||
|
||||
// Package httphdr implements functionality for parsing and formatting
|
||||
// standard HTTP headers.
|
||||
package httphdr
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// Range is a range of bytes within some content.
|
||||
type Range struct {
|
||||
// Start is the starting offset.
|
||||
// It is zero if Length is negative; it must not be negative.
|
||||
Start int64
|
||||
// Length is the length of the content.
|
||||
// It is zero if the length extends to the end of the content.
|
||||
// It is negative if the length is relative to the end (e.g., last 5 bytes).
|
||||
Length int64
|
||||
}
|
||||
|
||||
// ows is optional whitespace.
|
||||
const ows = " \t" // per RFC 7230, section 3.2.3
|
||||
|
||||
// ParseRange parses a "Range" header per RFC 7233, section 3.
|
||||
// It only handles "Range" headers where the units is "bytes".
|
||||
// The "Range" header is usually only specified in GET requests.
|
||||
func ParseRange(hdr string) (ranges []Range, ok bool) {
|
||||
// Grammar per RFC 7233, appendix D:
|
||||
// Range = byte-ranges-specifier | other-ranges-specifier
|
||||
// byte-ranges-specifier = bytes-unit "=" byte-range-set
|
||||
// bytes-unit = "bytes"
|
||||
// byte-range-set =
|
||||
// *("," OWS)
|
||||
// (byte-range-spec | suffix-byte-range-spec)
|
||||
// *(OWS "," [OWS ( byte-range-spec | suffix-byte-range-spec )])
|
||||
// byte-range-spec = first-byte-pos "-" [last-byte-pos]
|
||||
// suffix-byte-range-spec = "-" suffix-length
|
||||
// We do not support other-ranges-specifier.
|
||||
// All other identifiers are 1*DIGIT.
|
||||
hdr = strings.Trim(hdr, ows) // per RFC 7230, section 3.2
|
||||
units, elems, hasUnits := strings.Cut(hdr, "=")
|
||||
elems = strings.TrimLeft(elems, ","+ows)
|
||||
for _, elem := range strings.Split(elems, ",") {
|
||||
elem = strings.Trim(elem, ows) // per RFC 7230, section 7
|
||||
switch {
|
||||
case strings.HasPrefix(elem, "-"): // i.e., "-" suffix-length
|
||||
n, ok := parseNumber(strings.TrimPrefix(elem, "-"))
|
||||
if !ok {
|
||||
return ranges, false
|
||||
}
|
||||
ranges = append(ranges, Range{0, -n})
|
||||
case strings.HasSuffix(elem, "-"): // i.e., first-byte-pos "-"
|
||||
n, ok := parseNumber(strings.TrimSuffix(elem, "-"))
|
||||
if !ok {
|
||||
return ranges, false
|
||||
}
|
||||
ranges = append(ranges, Range{n, 0})
|
||||
default: // i.e., first-byte-pos "-" last-byte-pos
|
||||
prefix, suffix, hasDash := strings.Cut(elem, "-")
|
||||
n, ok2 := parseNumber(prefix)
|
||||
m, ok3 := parseNumber(suffix)
|
||||
if !hasDash || !ok2 || !ok3 || m < n {
|
||||
return ranges, false
|
||||
}
|
||||
ranges = append(ranges, Range{n, m - n + 1})
|
||||
}
|
||||
}
|
||||
return ranges, units == "bytes" && hasUnits && len(ranges) > 0 // must see at least one element per RFC 7233, section 2.1
|
||||
}
|
||||
|
||||
// FormatRange formats a "Range" header per RFC 7233, section 3.
|
||||
// It only handles "Range" headers where the units is "bytes".
|
||||
// The "Range" header is usually only specified in GET requests.
|
||||
func FormatRange(ranges []Range) (hdr string, ok bool) {
|
||||
b := []byte("bytes=")
|
||||
for _, r := range ranges {
|
||||
switch {
|
||||
case r.Length > 0: // i.e., first-byte-pos "-" last-byte-pos
|
||||
if r.Start < 0 {
|
||||
return string(b), false
|
||||
}
|
||||
b = strconv.AppendUint(b, uint64(r.Start), 10)
|
||||
b = append(b, '-')
|
||||
b = strconv.AppendUint(b, uint64(r.Start+r.Length-1), 10)
|
||||
b = append(b, ',')
|
||||
case r.Length == 0: // i.e., first-byte-pos "-"
|
||||
if r.Start < 0 {
|
||||
return string(b), false
|
||||
}
|
||||
b = strconv.AppendUint(b, uint64(r.Start), 10)
|
||||
b = append(b, '-')
|
||||
b = append(b, ',')
|
||||
case r.Length < 0: // i.e., "-" suffix-length
|
||||
if r.Start != 0 {
|
||||
return string(b), false
|
||||
}
|
||||
b = append(b, '-')
|
||||
b = strconv.AppendUint(b, uint64(-r.Length), 10)
|
||||
b = append(b, ',')
|
||||
default:
|
||||
return string(b), false
|
||||
}
|
||||
}
|
||||
return string(bytes.TrimRight(b, ",")), len(ranges) > 0
|
||||
}
|
||||
|
||||
// ParseContentRange parses a "Content-Range" header per RFC 7233, section 4.2.
|
||||
// It only handles "Content-Range" headers where the units is "bytes".
|
||||
// The "Content-Range" header is usually only specified in HTTP responses.
|
||||
//
|
||||
// If only the completeLength is specified, then start and length are both zero.
|
||||
//
|
||||
// Otherwise, the parses the start and length and the optional completeLength,
|
||||
// which is -1 if unspecified. The start is non-negative and the length is positive.
|
||||
func ParseContentRange(hdr string) (start, length, completeLength int64, ok bool) {
|
||||
// Grammar per RFC 7233, appendix D:
|
||||
// Content-Range = byte-content-range | other-content-range
|
||||
// byte-content-range = bytes-unit SP (byte-range-resp | unsatisfied-range)
|
||||
// bytes-unit = "bytes"
|
||||
// byte-range-resp = byte-range "/" (complete-length | "*")
|
||||
// unsatisfied-range = "*/" complete-length
|
||||
// byte-range = first-byte-pos "-" last-byte-pos
|
||||
// We do not support other-content-range.
|
||||
// All other identifiers are 1*DIGIT.
|
||||
hdr = strings.Trim(hdr, ows) // per RFC 7230, section 3.2
|
||||
suffix, hasUnits := strings.CutPrefix(hdr, "bytes ")
|
||||
suffix, unsatisfied := strings.CutPrefix(suffix, "*/")
|
||||
if unsatisfied { // i.e., unsatisfied-range
|
||||
n, ok := parseNumber(suffix)
|
||||
if !ok {
|
||||
return start, length, completeLength, false
|
||||
}
|
||||
completeLength = n
|
||||
} else { // i.e., byte-range "/" (complete-length | "*")
|
||||
prefix, suffix, hasDash := strings.Cut(suffix, "-")
|
||||
middle, suffix, hasSlash := strings.Cut(suffix, "/")
|
||||
n, ok0 := parseNumber(prefix)
|
||||
m, ok1 := parseNumber(middle)
|
||||
o, ok2 := parseNumber(suffix)
|
||||
if suffix == "*" {
|
||||
o, ok2 = -1, true
|
||||
}
|
||||
if !hasDash || !hasSlash || !ok0 || !ok1 || !ok2 || m < n || (o >= 0 && o <= m) {
|
||||
return start, length, completeLength, false
|
||||
}
|
||||
start = n
|
||||
length = m - n + 1
|
||||
completeLength = o
|
||||
}
|
||||
return start, length, completeLength, hasUnits
|
||||
}
|
||||
|
||||
// FormatContentRange parses a "Content-Range" header per RFC 7233, section 4.2.
|
||||
// It only handles "Content-Range" headers where the units is "bytes".
|
||||
// The "Content-Range" header is usually only specified in HTTP responses.
|
||||
//
|
||||
// If start and length are non-positive, then it encodes just the completeLength,
|
||||
// which must be a non-negative value.
|
||||
//
|
||||
// Otherwise, it encodes the start and length as a byte-range,
|
||||
// and optionally emits the complete length if it is non-negative.
|
||||
// The length must be positive (as RFC 7233 uses inclusive end offsets).
|
||||
func FormatContentRange(start, length, completeLength int64) (hdr string, ok bool) {
|
||||
b := []byte("bytes ")
|
||||
switch {
|
||||
case start <= 0 && length <= 0 && completeLength >= 0: // i.e., unsatisfied-range
|
||||
b = append(b, "*/"...)
|
||||
b = strconv.AppendUint(b, uint64(completeLength), 10)
|
||||
ok = true
|
||||
case start >= 0 && length > 0: // i.e., byte-range "/" (complete-length | "*")
|
||||
b = strconv.AppendUint(b, uint64(start), 10)
|
||||
b = append(b, '-')
|
||||
b = strconv.AppendUint(b, uint64(start+length-1), 10)
|
||||
b = append(b, '/')
|
||||
if completeLength >= 0 {
|
||||
b = strconv.AppendUint(b, uint64(completeLength), 10)
|
||||
ok = completeLength >= start+length && start+length > 0
|
||||
} else {
|
||||
b = append(b, '*')
|
||||
ok = true
|
||||
}
|
||||
}
|
||||
return string(b), ok
|
||||
}
|
||||
|
||||
// parseNumber parses s as an unsigned decimal integer.
|
||||
// It parses according to the 1*DIGIT grammar, which allows leading zeros.
|
||||
func parseNumber(s string) (int64, bool) {
|
||||
suffix := strings.TrimLeft(s, "0123456789")
|
||||
prefix := s[:len(s)-len(suffix)]
|
||||
n, err := strconv.ParseInt(prefix, 10, 64)
|
||||
return n, suffix == "" && err == nil
|
||||
}
|
||||
Reference in New Issue
Block a user