118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package text
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import (
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"bytes"
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"html"
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"html/template"
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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"github.com/superseriousbusiness/gotosocial/internal/regexes"
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)
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// EmojifyWeb replaces emoji shortcodes like `:example:` in the given HTML
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// fragment with `<img>` tags suitable for rendering on the web frontend.
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func EmojifyWeb(emojis []apimodel.Emoji, html template.HTML) template.HTML {
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out := emojify(
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emojis,
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string(html),
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func(url, code string, buf *bytes.Buffer) {
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buf.WriteString(`<img src="`)
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buf.WriteString(url)
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buf.WriteString(`" title=":`)
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buf.WriteString(code)
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buf.WriteString(`:" alt=":`)
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buf.WriteString(code)
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buf.WriteString(`:" class="emoji" `)
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// Lazy load emojis when
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// they scroll into view.
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buf.WriteString(`loading="lazy" `)
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// Limit size to avoid showing
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// huge emojis when unstyled.
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buf.WriteString(`width="25" height="25"/>`)
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},
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)
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// If input was safe,
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// we can trust output.
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return template.HTML(out) // #nosec G203
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}
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// EmojifyRSS replaces emoji shortcodes like `:example:` in the given text
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// fragment with `<img>` tags suitable for rendering as RSS content.
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func EmojifyRSS(emojis []apimodel.Emoji, text string) string {
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return emojify(
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emojis,
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text,
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func(url, code string, buf *bytes.Buffer) {
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buf.WriteString(`<img src="`)
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buf.WriteString(url)
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buf.WriteString(`" title=":`)
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buf.WriteString(code)
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buf.WriteString(`:" alt=":`)
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buf.WriteString(code)
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buf.WriteString(`:" `)
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// Limit size to avoid showing
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// huge emojis in RSS readers.
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buf.WriteString(`width="25" height="25"/>`)
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},
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)
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}
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// Demojify replaces emoji shortcodes like `:example:` in the given text
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// fragment with empty strings, essentially stripping them from the text.
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// This is useful for text used in OG Meta headers.
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func Demojify(text string) string {
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return regexes.EmojiFinder.ReplaceAllString(text, "")
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}
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func emojify(
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emojis []apimodel.Emoji,
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input string,
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write func(url, code string, buf *bytes.Buffer),
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) string {
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// Build map of shortcodes. Normalize each
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// shortcode by readding closing colons.
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emojisMap := make(map[string]apimodel.Emoji, len(emojis))
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for _, emoji := range emojis {
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shortcode := ":" + emoji.Shortcode + ":"
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emojisMap[shortcode] = emoji
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}
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return regexes.ReplaceAllStringFunc(
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regexes.EmojiFinder,
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input,
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func(shortcode string, buf *bytes.Buffer) string {
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// Look for emoji with this shortcode.
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emoji, ok := emojisMap[shortcode]
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if !ok {
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return shortcode
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}
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// Escape raw emoji content.
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url := html.EscapeString(emoji.URL)
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code := html.EscapeString(emoji.Shortcode)
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// Write emoji repr to buffer.
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write(url, code, buf)
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return buf.String()
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},
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)
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}
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