150 lines
3.3 KiB
Go
150 lines
3.3 KiB
Go
package transport
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import (
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"net/http"
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"strings"
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)
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// Octet types from RFC 2616.
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type octetType byte
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// authorizationChallenge carries information
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// from a WWW-Authenticate response header.
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type authorizationChallenge struct {
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Scheme string
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Parameters map[string]string
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}
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var octetTypes [256]octetType
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const (
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isToken octetType = 1 << iota
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isSpace
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)
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func init() {
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// OCTET = <any 8-bit sequence of data>
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// CHAR = <any US-ASCII character (octets 0 - 127)>
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// CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
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// CR = <US-ASCII CR, carriage return (13)>
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// LF = <US-ASCII LF, linefeed (10)>
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// SP = <US-ASCII SP, space (32)>
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// HT = <US-ASCII HT, horizontal-tab (9)>
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// <"> = <US-ASCII double-quote mark (34)>
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// CRLF = CR LF
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// LWS = [CRLF] 1*( SP | HT )
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// TEXT = <any OCTET except CTLs, but including LWS>
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// separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <">
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// | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT
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// token = 1*<any CHAR except CTLs or separators>
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// qdtext = <any TEXT except <">>
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for c := 0; c < 256; c++ {
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var t octetType
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isCtl := c <= 31 || c == 127
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isChar := 0 <= c && c <= 127
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isSeparator := strings.IndexRune(" \t\"(),/:;<=>?@[]\\{}", rune(c)) >= 0
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if strings.IndexRune(" \t\r\n", rune(c)) >= 0 {
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t |= isSpace
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}
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if isChar && !isCtl && !isSeparator {
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t |= isToken
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}
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octetTypes[c] = t
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}
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}
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func parseAuthHeader(header http.Header) map[string]authorizationChallenge {
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challenges := map[string]authorizationChallenge{}
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for _, h := range header[http.CanonicalHeaderKey("WWW-Authenticate")] {
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v, p := parseValueAndParams(h)
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if v != "" {
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challenges[v] = authorizationChallenge{Scheme: v, Parameters: p}
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}
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}
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return challenges
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}
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func parseValueAndParams(header string) (value string, params map[string]string) {
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params = make(map[string]string)
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value, s := expectToken(header)
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if value == "" {
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return
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}
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value = strings.ToLower(value)
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s = "," + skipSpace(s)
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for strings.HasPrefix(s, ",") {
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var pkey string
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pkey, s = expectToken(skipSpace(s[1:]))
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if pkey == "" {
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return
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}
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if !strings.HasPrefix(s, "=") {
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return
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}
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var pvalue string
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pvalue, s = expectTokenOrQuoted(s[1:])
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if pvalue == "" {
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return
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}
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pkey = strings.ToLower(pkey)
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params[pkey] = pvalue
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s = skipSpace(s)
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}
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return
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}
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func skipSpace(s string) (rest string) {
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i := 0
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for ; i < len(s); i++ {
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if octetTypes[s[i]]&isSpace == 0 {
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break
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}
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}
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return s[i:]
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}
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func expectToken(s string) (token, rest string) {
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i := 0
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for ; i < len(s); i++ {
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if octetTypes[s[i]]&isToken == 0 {
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break
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}
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}
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return s[:i], s[i:]
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}
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func expectTokenOrQuoted(s string) (value string, rest string) {
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if !strings.HasPrefix(s, "\"") {
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return expectToken(s)
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}
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s = s[1:]
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for i := 0; i < len(s); i++ {
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switch s[i] {
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case '"':
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return s[:i], s[i+1:]
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case '\\':
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p := make([]byte, len(s)-1)
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j := copy(p, s[:i])
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escape := true
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for i = i + 1; i < len(s); i++ {
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b := s[i]
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switch {
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case escape:
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escape = false
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p[j] = b
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j++
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case b == '\\':
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escape = true
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case b == '"':
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return string(p[:j]), s[i+1:]
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default:
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p[j] = b
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j++
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}
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}
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return "", ""
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}
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}
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return "", ""
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}
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