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author | Tilo Spannagel <development@tilosp.de> | 2020-08-30 14:01:52 +0200 |
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committer | GitHub <noreply@github.com> | 2020-08-30 14:01:52 +0200 |
commit | f9928c9e259fefee5bd049dbc8d8e5d98107f136 (patch) | |
tree | a593a2376ca4debdecb31b431e9d3928383d89e6 /vendor/github.com/matterbridge/gomatrix/userids.go | |
parent | a0741d99b80d7da1c063853382756b3a9689f6a7 (diff) | |
download | matterbridge-msglm-f9928c9e259fefee5bd049dbc8d8e5d98107f136.tar.gz matterbridge-msglm-f9928c9e259fefee5bd049dbc8d8e5d98107f136.tar.bz2 matterbridge-msglm-f9928c9e259fefee5bd049dbc8d8e5d98107f136.zip |
Switch to upstream gomatrix (#1219)
Signed-off-by: Tilo Spannagel <development@tilosp.de>
Diffstat (limited to 'vendor/github.com/matterbridge/gomatrix/userids.go')
-rw-r--r-- | vendor/github.com/matterbridge/gomatrix/userids.go | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/vendor/github.com/matterbridge/gomatrix/userids.go b/vendor/github.com/matterbridge/gomatrix/userids.go deleted file mode 100644 index 70002c5b..00000000 --- a/vendor/github.com/matterbridge/gomatrix/userids.go +++ /dev/null @@ -1,130 +0,0 @@ -package gomatrix - -import ( - "bytes" - "encoding/hex" - "fmt" - "strings" -) - -const lowerhex = "0123456789abcdef" - -// encode the given byte using quoted-printable encoding (e.g "=2f") -// and writes it to the buffer -// See https://golang.org/src/mime/quotedprintable/writer.go -func encode(buf *bytes.Buffer, b byte) { - buf.WriteByte('=') - buf.WriteByte(lowerhex[b>>4]) - buf.WriteByte(lowerhex[b&0x0f]) -} - -// escape the given alpha character and writes it to the buffer -func escape(buf *bytes.Buffer, b byte) { - buf.WriteByte('_') - if b == '_' { - buf.WriteByte('_') // another _ - } else { - buf.WriteByte(b + 0x20) // ASCII shift A-Z to a-z - } -} - -func shouldEncode(b byte) bool { - return b != '-' && b != '.' && b != '_' && !(b >= '0' && b <= '9') && !(b >= 'a' && b <= 'z') && !(b >= 'A' && b <= 'Z') -} - -func shouldEscape(b byte) bool { - return (b >= 'A' && b <= 'Z') || b == '_' -} - -func isValidByte(b byte) bool { - return isValidEscapedChar(b) || (b >= '0' && b <= '9') || b == '.' || b == '=' || b == '-' -} - -func isValidEscapedChar(b byte) bool { - return b == '_' || (b >= 'a' && b <= 'z') -} - -// EncodeUserLocalpart encodes the given string into Matrix-compliant user ID localpart form. -// See http://matrix.org/docs/spec/intro.html#mapping-from-other-character-sets -// -// This returns a string with only the characters "a-z0-9._=-". The uppercase range A-Z -// are encoded using leading underscores ("_"). Characters outside the aforementioned ranges -// (including literal underscores ("_") and equals ("=")) are encoded as UTF8 code points (NOT NCRs) -// and converted to lower-case hex with a leading "=". For example: -// Alph@Bet_50up => _alph=40_bet=5f50up -func EncodeUserLocalpart(str string) string { - strBytes := []byte(str) - var outputBuffer bytes.Buffer - for _, b := range strBytes { - if shouldEncode(b) { - encode(&outputBuffer, b) - } else if shouldEscape(b) { - escape(&outputBuffer, b) - } else { - outputBuffer.WriteByte(b) - } - } - return outputBuffer.String() -} - -// DecodeUserLocalpart decodes the given string back into the original input string. -// Returns an error if the given string is not a valid user ID localpart encoding. -// See http://matrix.org/docs/spec/intro.html#mapping-from-other-character-sets -// -// This decodes quoted-printable bytes back into UTF8, and unescapes casing. For -// example: -// _alph=40_bet=5f50up => Alph@Bet_50up -// Returns an error if the input string contains characters outside the -// range "a-z0-9._=-", has an invalid quote-printable byte (e.g. not hex), or has -// an invalid _ escaped byte (e.g. "_5"). -func DecodeUserLocalpart(str string) (string, error) { - strBytes := []byte(str) - var outputBuffer bytes.Buffer - for i := 0; i < len(strBytes); i++ { - b := strBytes[i] - if !isValidByte(b) { - return "", fmt.Errorf("Byte pos %d: Invalid byte", i) - } - - if b == '_' { // next byte is a-z and should be upper-case or is another _ and should be a literal _ - if i+1 >= len(strBytes) { - return "", fmt.Errorf("Byte pos %d: expected _[a-z_] encoding but ran out of string", i) - } - if !isValidEscapedChar(strBytes[i+1]) { // invalid escaping - return "", fmt.Errorf("Byte pos %d: expected _[a-z_] encoding", i) - } - if strBytes[i+1] == '_' { - outputBuffer.WriteByte('_') - } else { - outputBuffer.WriteByte(strBytes[i+1] - 0x20) // ASCII shift a-z to A-Z - } - i++ // skip next byte since we just handled it - } else if b == '=' { // next 2 bytes are hex and should be buffered ready to be read as utf8 - if i+2 >= len(strBytes) { - return "", fmt.Errorf("Byte pos: %d: expected quote-printable encoding but ran out of string", i) - } - dst := make([]byte, 1) - _, err := hex.Decode(dst, strBytes[i+1:i+3]) - if err != nil { - return "", err - } - outputBuffer.WriteByte(dst[0]) - i += 2 // skip next 2 bytes since we just handled it - } else { // pass through - outputBuffer.WriteByte(b) - } - } - return outputBuffer.String(), nil -} - -// ExtractUserLocalpart extracts the localpart portion of a user ID. -// See http://matrix.org/docs/spec/intro.html#user-identifiers -func ExtractUserLocalpart(userID string) (string, error) { - if len(userID) == 0 || userID[0] != '@' { - return "", fmt.Errorf("%s is not a valid user id", userID) - } - return strings.TrimPrefix( - strings.SplitN(userID, ":", 2)[0], // @foo:bar:8448 => [ "@foo", "bar:8448" ] - "@", // remove "@" prefix - ), nil -} |