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mime: RFC 2231 continuation / non-ASCII support
Fixes #1119. R=rsc, r CC=golang-dev https://golang.org/cl/4437052
This commit is contained in:
Brad Fitzpatrick
parent
23fc9c84bd
commit
98176b7760
@ -6,6 +6,8 @@ package mime
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import (
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"bytes"
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"fmt"
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"os"
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"strings"
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"unicode"
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)
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@ -46,11 +48,16 @@ func ParseMediaType(v string) (mediatype string, params map[string]string) {
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params = make(map[string]string)
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// Map of base parameter name -> parameter name -> value
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// for parameters containing a '*' character.
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// Lazily initialized.
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var continuation map[string]map[string]string
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v = v[i:]
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for len(v) > 0 {
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v = strings.TrimLeftFunc(v, unicode.IsSpace)
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if len(v) == 0 {
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return
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break
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}
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key, value, rest := consumeMediaParam(v)
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if key == "" {
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@ -62,12 +69,83 @@ func ParseMediaType(v string) (mediatype string, params map[string]string) {
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// Parse error.
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return "", nil
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}
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params[key] = value
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pmap := params
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if idx := strings.Index(key, "*"); idx != -1 {
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baseName := key[:idx]
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if continuation == nil {
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continuation = make(map[string]map[string]string)
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}
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var ok bool
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if pmap, ok = continuation[baseName]; !ok {
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continuation[baseName] = make(map[string]string)
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pmap = continuation[baseName]
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}
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}
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if _, exists := pmap[key]; exists {
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// Duplicate parameter name is bogus.
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return "", nil
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}
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pmap[key] = value
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v = rest
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}
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// Stitch together any continuations or things with stars
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// (i.e. RFC 2231 things with stars: "foo*0" or "foo*")
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var buf bytes.Buffer
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for key, pieceMap := range continuation {
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singlePartKey := key + "*"
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if v, ok := pieceMap[singlePartKey]; ok {
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decv := decode2231Enc(v)
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params[key] = decv
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continue
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}
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buf.Reset()
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valid := false
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for n := 0; ; n++ {
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simplePart := fmt.Sprintf("%s*%d", key, n)
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if v, ok := pieceMap[simplePart]; ok {
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valid = true
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buf.WriteString(v)
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continue
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}
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encodedPart := simplePart + "*"
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if v, ok := pieceMap[encodedPart]; ok {
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valid = true
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if n == 0 {
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buf.WriteString(decode2231Enc(v))
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} else {
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decv, _ := percentHexUnescape(v)
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buf.WriteString(decv)
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}
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} else {
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break
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}
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}
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if valid {
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params[key] = buf.String()
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}
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}
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return
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}
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func decode2231Enc(v string) string {
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sv := strings.Split(v, "'", 3)
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if len(sv) != 3 {
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return ""
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}
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// Ignoring lang in sv[1] for now.
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charset := strings.ToLower(sv[0])
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if charset != "us-ascii" && charset != "utf-8" {
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// TODO: unsupported encoding
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return ""
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}
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encv, _ := percentHexUnescape(sv[2])
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return encv
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}
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func isNotTokenChar(rune int) bool {
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return !IsTokenChar(rune)
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}
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@ -107,17 +185,14 @@ func consumeValue(v string) (value, rest string) {
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for idx, rune = range rest {
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switch {
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case nextIsLiteral:
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if rune >= 0x80 {
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return "", v
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}
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buffer.WriteRune(rune)
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nextIsLiteral = false
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case rune == leadQuote:
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return buffer.String(), rest[idx+1:]
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case IsQText(rune):
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buffer.WriteRune(rune)
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case rune == '\\':
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nextIsLiteral = true
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case rune != '\r' && rune != '\n':
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buffer.WriteRune(rune)
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default:
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return "", v
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}
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@ -137,6 +212,7 @@ func consumeMediaParam(v string) (param, value, rest string) {
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if param == "" {
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return "", "", v
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}
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rest = strings.TrimLeftFunc(rest, unicode.IsSpace)
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if !strings.HasPrefix(rest, "=") {
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return "", "", v
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@ -149,3 +225,66 @@ func consumeMediaParam(v string) (param, value, rest string) {
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}
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return param, value, rest
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}
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func percentHexUnescape(s string) (string, os.Error) {
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// Count %, check that they're well-formed.
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percents := 0
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for i := 0; i < len(s); {
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if s[i] != '%' {
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i++
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continue
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}
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percents++
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if i+2 >= len(s) || !ishex(s[i+1]) || !ishex(s[i+2]) {
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s = s[i:]
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if len(s) > 3 {
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s = s[0:3]
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}
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return "", fmt.Errorf("Bogus characters after %: %q", s)
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}
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i += 3
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}
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if percents == 0 {
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return s, nil
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}
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t := make([]byte, len(s)-2*percents)
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j := 0
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for i := 0; i < len(s); {
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switch s[i] {
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case '%':
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t[j] = unhex(s[i+1])<<4 | unhex(s[i+2])
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j++
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i += 3
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default:
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t[j] = s[i]
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j++
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i++
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}
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}
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return string(t), nil
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}
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func ishex(c byte) bool {
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switch {
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case '0' <= c && c <= '9':
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return true
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case 'a' <= c && c <= 'f':
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return true
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case 'A' <= c && c <= 'F':
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return true
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}
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return false
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}
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func unhex(c byte) byte {
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switch {
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case '0' <= c && c <= '9':
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return c - '0'
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case 'a' <= c && c <= 'f':
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return c - 'a' + 10
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case 'A' <= c && c <= 'F':
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return c - 'A' + 10
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}
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return 0
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}
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@ -114,6 +114,28 @@ func TestParseMediaType(t *testing.T) {
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"form-data",
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m("key", "value", "blah", "value", "name", "foo")},
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{`foo; key=val1; key=the-key-appears-again-which-is-bogus`,
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"", m()},
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// From RFC 2231:
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{`application/x-stuff; title*=us-ascii'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A`,
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"application/x-stuff",
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m("title", "This is ***fun***")},
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{`message/external-body; access-type=URL; ` +
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`URL*0="ftp://";` +
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`URL*1="cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar"`,
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"message/external-body",
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m("access-type", "URL",
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"URL", "ftp://cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar")},
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{`application/x-stuff; ` +
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`title*0*=us-ascii'en'This%20is%20even%20more%20; ` +
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`title*1*=%2A%2A%2Afun%2A%2A%2A%20; ` +
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`title*2="isn't it!"`,
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"application/x-stuff",
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m("title", "This is even more ***fun*** isn't it!")},
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// Tests from http://greenbytes.de/tech/tc2231/
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// TODO(bradfitz): add the rest of the tests from that site.
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{`attachment; filename="f\oo.html"`,
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@ -159,8 +181,41 @@ func TestParseMediaType(t *testing.T) {
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"attachment",
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m("creation-date", "Wed, 12 Feb 1997 16:29:51 -0500")},
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{`foobar`, "foobar", m()},
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// TODO(bradfitz): rest of them, including RFC2231 encoded UTF-8 and
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// other charsets.
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{`attachment; filename* =UTF-8''foo-%c3%a4.html`,
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"attachment",
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m("filename", "foo-ä.html")},
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{`attachment; filename*=UTF-8''A-%2541.html`,
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"attachment",
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m("filename", "A-%41.html")},
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{`attachment; filename*0="foo."; filename*1="html"`,
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"attachment",
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m("filename", "foo.html")},
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{`attachment; filename*0*=UTF-8''foo-%c3%a4; filename*1=".html"`,
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"attachment",
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m("filename", "foo-ä.html")},
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{`attachment; filename*0="foo"; filename*01="bar"`,
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"attachment",
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m("filename", "foo")},
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{`attachment; filename*0="foo"; filename*2="bar"`,
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"attachment",
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m("filename", "foo")},
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{`attachment; filename*1="foo"; filename*2="bar"`,
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"attachment", m()},
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{`attachment; filename*1="bar"; filename*0="foo"`,
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"attachment",
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m("filename", "foobar")},
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{`attachment; filename="foo-ae.html"; filename*=UTF-8''foo-%c3%a4.html`,
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"attachment",
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m("filename", "foo-ä.html")},
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{`attachment; filename*=UTF-8''foo-%c3%a4.html; filename="foo-ae.html"`,
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"attachment",
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m("filename", "foo-ä.html")},
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// Browsers also just send UTF-8 directly without RFC 2231,
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// at least when the source page is served with UTF-8.
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{`form-data; firstname="Брэд"; lastname="Фицпатрик"`,
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"form-data",
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m("firstname", "Брэд", "lastname", "Фицпатрик")},
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}
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for _, test := range tests {
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mt, params := ParseMediaType(test.in)
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