mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-25 13:16:40 +00:00
333 lines
6.9 KiB
Go
333 lines
6.9 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file or at
|
|
// https://developers.google.com/open-source/licenses/bsd.
|
|
|
|
// this file was taken from the github.com/golang/gddo repository
|
|
|
|
// Package header provides functions for parsing HTTP headers.
|
|
package header
|
|
|
|
import (
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
// Octet types from RFC 2616.
|
|
var octetTypes [256]octetType
|
|
|
|
type octetType byte
|
|
|
|
const (
|
|
isToken octetType = 1 << iota
|
|
isSpace
|
|
)
|
|
|
|
func init() {
|
|
// OCTET = <any 8-bit sequence of data>
|
|
// CHAR = <any US-ASCII character (octets 0 - 127)>
|
|
// CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
|
|
// CR = <US-ASCII CR, carriage return (13)>
|
|
// LF = <US-ASCII LF, linefeed (10)>
|
|
// SP = <US-ASCII SP, space (32)>
|
|
// HT = <US-ASCII HT, horizontal-tab (9)>
|
|
// <"> = <US-ASCII double-quote mark (34)>
|
|
// CRLF = CR LF
|
|
// LWS = [CRLF] 1*( SP | HT )
|
|
// TEXT = <any OCTET except CTLs, but including LWS>
|
|
// separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <">
|
|
// | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT
|
|
// token = 1*<any CHAR except CTLs or separators>
|
|
// qdtext = <any TEXT except <">>
|
|
|
|
for c := 0; c < 256; c++ {
|
|
var t octetType
|
|
isCtl := c <= 31 || c == 127
|
|
isChar := 0 <= c && c <= 127
|
|
isSeparator := strings.ContainsRune(" \t\"(),/:;<=>?@[]\\{}", rune(c))
|
|
if strings.ContainsRune(" \t\r\n", rune(c)) {
|
|
t |= isSpace
|
|
}
|
|
if isChar && !isCtl && !isSeparator {
|
|
t |= isToken
|
|
}
|
|
octetTypes[c] = t
|
|
}
|
|
}
|
|
|
|
// Copy returns a shallow copy of the header.
|
|
func Copy(header http.Header) http.Header {
|
|
h := make(http.Header)
|
|
for k, vs := range header {
|
|
h[k] = vs
|
|
}
|
|
return h
|
|
}
|
|
|
|
var timeLayouts = []string{"Mon, 02 Jan 2006 15:04:05 GMT", time.RFC850, time.ANSIC}
|
|
|
|
// ParseTime parses the header as time. The zero value is returned if the
|
|
// header is not present or there is an error parsing the
|
|
// header.
|
|
func ParseTime(header http.Header, key string) time.Time {
|
|
if s := header.Get(key); s != "" {
|
|
for _, layout := range timeLayouts {
|
|
if t, err := time.Parse(layout, s); err == nil {
|
|
return t.UTC()
|
|
}
|
|
}
|
|
}
|
|
return time.Time{}
|
|
}
|
|
|
|
// ParseList parses a comma separated list of values. Commas are ignored in
|
|
// quoted strings. Quoted values are not unescaped or unquoted. Whitespace is
|
|
// trimmed.
|
|
func ParseList(header http.Header, key string) []string {
|
|
var result []string
|
|
for _, s := range header[http.CanonicalHeaderKey(key)] {
|
|
begin := 0
|
|
end := 0
|
|
escape := false
|
|
quote := false
|
|
for i := 0; i < len(s); i++ {
|
|
b := s[i]
|
|
switch {
|
|
case escape:
|
|
escape = false
|
|
end = i + 1
|
|
case quote:
|
|
switch b {
|
|
case '\\':
|
|
escape = true
|
|
case '"':
|
|
quote = false
|
|
}
|
|
end = i + 1
|
|
case b == '"':
|
|
quote = true
|
|
end = i + 1
|
|
case octetTypes[b]&isSpace != 0:
|
|
if begin == end {
|
|
begin = i + 1
|
|
end = begin
|
|
}
|
|
case b == ',':
|
|
if begin < end {
|
|
result = append(result, s[begin:end])
|
|
}
|
|
begin = i + 1
|
|
end = begin
|
|
default:
|
|
end = i + 1
|
|
}
|
|
}
|
|
if begin < end {
|
|
result = append(result, s[begin:end])
|
|
}
|
|
}
|
|
return result
|
|
}
|
|
|
|
// ParseValueAndParams parses a comma separated list of values with optional
|
|
// semicolon separated name-value pairs. Content-Type and Content-Disposition
|
|
// headers are in this format.
|
|
func ParseValueAndParams(header http.Header, key string) (string, map[string]string) {
|
|
return parseValueAndParams(header.Get(key))
|
|
}
|
|
|
|
func parseValueAndParams(s string) (value string, params map[string]string) {
|
|
params = make(map[string]string)
|
|
value, s = expectTokenSlash(s)
|
|
if value == "" {
|
|
return
|
|
}
|
|
value = strings.ToLower(value)
|
|
s = skipSpace(s)
|
|
for strings.HasPrefix(s, ";") {
|
|
var pkey string
|
|
pkey, s = expectToken(skipSpace(s[1:]))
|
|
if pkey == "" {
|
|
return
|
|
}
|
|
if !strings.HasPrefix(s, "=") {
|
|
return
|
|
}
|
|
var pvalue string
|
|
pvalue, s = expectTokenOrQuoted(s[1:])
|
|
if pvalue == "" {
|
|
return
|
|
}
|
|
pkey = strings.ToLower(pkey)
|
|
params[pkey] = pvalue
|
|
s = skipSpace(s)
|
|
}
|
|
return
|
|
}
|
|
|
|
// AcceptSpec ...
|
|
type AcceptSpec struct {
|
|
Value string
|
|
Q float64
|
|
}
|
|
|
|
// ParseAccept2 ...
|
|
func ParseAccept2(header http.Header, key string) (specs []AcceptSpec) {
|
|
for _, en := range ParseList(header, key) {
|
|
v, p := parseValueAndParams(en)
|
|
var spec AcceptSpec
|
|
spec.Value = v
|
|
spec.Q = 1.0
|
|
if p != nil {
|
|
if q, ok := p["q"]; ok {
|
|
spec.Q, _ = expectQuality(q)
|
|
}
|
|
}
|
|
if spec.Q < 0.0 {
|
|
continue
|
|
}
|
|
specs = append(specs, spec)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// ParseAccept parses Accept* headers.
|
|
func ParseAccept(header http.Header, key string) []AcceptSpec {
|
|
var specs []AcceptSpec
|
|
loop:
|
|
for _, s := range header[key] {
|
|
for {
|
|
var spec AcceptSpec
|
|
spec.Value, s = expectTokenSlash(s)
|
|
if spec.Value == "" {
|
|
continue loop
|
|
}
|
|
spec.Q = 1.0
|
|
s = skipSpace(s)
|
|
if strings.HasPrefix(s, ";") {
|
|
s = skipSpace(s[1:])
|
|
for !strings.HasPrefix(s, "q=") && s != "" && !strings.HasPrefix(s, ",") {
|
|
s = skipSpace(s[1:])
|
|
}
|
|
if strings.HasPrefix(s, "q=") {
|
|
spec.Q, s = expectQuality(s[2:])
|
|
if spec.Q < 0.0 {
|
|
continue loop
|
|
}
|
|
}
|
|
}
|
|
|
|
specs = append(specs, spec)
|
|
s = skipSpace(s)
|
|
if !strings.HasPrefix(s, ",") {
|
|
continue loop
|
|
}
|
|
s = skipSpace(s[1:])
|
|
}
|
|
}
|
|
|
|
return specs
|
|
}
|
|
|
|
func skipSpace(s string) (rest string) {
|
|
i := 0
|
|
for ; i < len(s); i++ {
|
|
if octetTypes[s[i]]&isSpace == 0 {
|
|
break
|
|
}
|
|
}
|
|
return s[i:]
|
|
}
|
|
|
|
func expectToken(s string) (token, rest string) {
|
|
i := 0
|
|
for ; i < len(s); i++ {
|
|
if octetTypes[s[i]]&isToken == 0 {
|
|
break
|
|
}
|
|
}
|
|
return s[:i], s[i:]
|
|
}
|
|
|
|
func expectTokenSlash(s string) (token, rest string) {
|
|
i := 0
|
|
for ; i < len(s); i++ {
|
|
b := s[i]
|
|
if (octetTypes[b]&isToken == 0) && b != '/' {
|
|
break
|
|
}
|
|
}
|
|
return s[:i], s[i:]
|
|
}
|
|
|
|
func expectQuality(s string) (q float64, rest string) {
|
|
switch {
|
|
case len(s) == 0:
|
|
return -1, ""
|
|
case s[0] == '0':
|
|
// q is already 0
|
|
s = s[1:]
|
|
case s[0] == '1':
|
|
s = s[1:]
|
|
q = 1
|
|
case s[0] == '.':
|
|
// q is already 0
|
|
default:
|
|
return -1, ""
|
|
}
|
|
if !strings.HasPrefix(s, ".") {
|
|
return q, s
|
|
}
|
|
s = s[1:]
|
|
i := 0
|
|
n := 0
|
|
d := 1
|
|
for ; i < len(s); i++ {
|
|
b := s[i]
|
|
if b < '0' || b > '9' {
|
|
break
|
|
}
|
|
n = n*10 + int(b) - '0'
|
|
d *= 10
|
|
}
|
|
return q + float64(n)/float64(d), s[i:]
|
|
}
|
|
|
|
func expectTokenOrQuoted(s string) (value string, rest string) {
|
|
if !strings.HasPrefix(s, "\"") {
|
|
return expectToken(s)
|
|
}
|
|
s = s[1:]
|
|
for i := 0; i < len(s); i++ {
|
|
switch s[i] {
|
|
case '"':
|
|
return s[:i], s[i+1:]
|
|
case '\\':
|
|
p := make([]byte, len(s)-1)
|
|
j := copy(p, s[:i])
|
|
escape := true
|
|
for i++; i < len(s); i++ {
|
|
b := s[i]
|
|
switch {
|
|
case escape:
|
|
escape = false
|
|
p[j] = b
|
|
j++
|
|
case b == '\\':
|
|
escape = true
|
|
case b == '"':
|
|
return string(p[:j]), s[i+1:]
|
|
default:
|
|
p[j] = b
|
|
j++
|
|
}
|
|
}
|
|
return "", ""
|
|
}
|
|
}
|
|
return "", ""
|
|
}
|