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parse_strings.go
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/
parse_strings.go
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package helpers
//
// GangGo Application Server
// Copyright (C) 2017 Lukas Matt <lukas@zauberstuhl.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
import (
"regexp"
"errors"
)
// Will contain following parts
// Index Match
// 0 @{ganggo@localhost; ganggo@localhost}
// 1 ganggo@localhost
// 2 ganggo
// 3 localhost
func ParseMentions(text string) [][]string {
r := regexp.MustCompile(`@\{\s*([^;]*?)[;\s]*([^@;\s]+?)@([^@;\s]+?)\s*\}`)
return r.FindAllStringSubmatch(text, -1)
}
func ParseTags(text string) [][]string {
r := regexp.MustCompile(`#([\w\d]{2,})`)
return r.FindAllStringSubmatch(text, -1)
}
func ParseHost(handle string) (string, error) {
parts, err := parseStringHelper(handle, `^.+?@(.+?)$`, 1)
if err != nil {
// fallback to links
parts, err = parseStringHelper(handle, `^https{0,1}://([^/]+).*$`, 1)
if err != nil {
return "", err
}
}
return parts[1], nil
}
func ParseUsername(handle string) (string, error) {
parts, err := parseStringHelper(handle, `^(.+?)@.+?$`, 1)
if err != nil {
// fallback to links
parts, err = parseStringHelper(handle,
`^https{0,1}://[^/]+/.*?([^/]+)/actor$`, 1)
if err != nil {
return "", err
}
}
return parts[1], nil
}
func ParseWebfingerHandle(handle string) (string, error) {
parts, err := parseStringHelper(handle, `^acct:(.+?)@.+?$`, 1)
if err != nil {
// being more open to legacy requests
parts, err = parseStringHelper(handle, `^(.+?)@.+?$`, 1)
if err != nil {
return "", err
}
}
return parts[1], nil
}
func parseStringHelper(line, regex string, max int) (parts []string, err error) {
r := regexp.MustCompile(regex)
parts = r.FindStringSubmatch(line)
if len(parts) < max {
err = errors.New("Cannot extract " + regex + " from " + line)
return
}
return
}