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5e2bf0bdca* [chore] Remove years from all license headers Years or year ranges aren't required in license headers. Many projects have removed them in recent years and it avoids a bit of yearly toil. In many cases our copyright claim was also a bit dodgy since we added the 2021-2023 header to files created after 2021 but you can't claim copyright into the past that way. * [chore] Add license header check This ensures a license header is always added to any new file. This avoids maintainers/reviewers needing to remember to check for and ask for it in case a contribution doesn't include it. * [chore] Add missing license headers * [chore] Further updates to license header * Use the more common // indentend comment format * Remove the hack we had for the linter now that we use the // format * Add SPDX license identifier
68 lines
3 KiB
Go
68 lines
3 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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"html"
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"regexp"
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"strings"
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"github.com/microcosm-cc/bluemonday"
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)
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// '[A]llows a broad selection of HTML elements and attributes that are safe for user generated content.
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// Note that this policy does not allow iframes, object, embed, styles, script, etc.
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// An example usage scenario would be blog post bodies where a variety of formatting is expected along with the potential for TABLEs and IMGs.'
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//
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// Source: https://github.com/microcosm-cc/bluemonday#usage
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var regular *bluemonday.Policy = bluemonday.UGCPolicy().
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RequireNoReferrerOnLinks(true).
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RequireNoFollowOnLinks(false). // remove the global default which adds rel="nofollow" to all links including local relative
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RequireNoFollowOnFullyQualifiedLinks(true). // add rel="nofollow" on all external links
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RequireCrossOriginAnonymous(true).
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AddTargetBlankToFullyQualifiedLinks(true).
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AllowAttrs("class", "href", "rel").OnElements("a").
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AllowAttrs("class").OnElements("span").
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AllowAttrs("class").Matching(regexp.MustCompile("^language-[a-zA-Z0-9]+$")).OnElements("code").
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SkipElementsContent("code", "pre")
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// '[C]an be thought of as equivalent to stripping all HTML elements and their attributes as it has nothing on its allowlist.
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// An example usage scenario would be blog post titles where HTML tags are not expected at all
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// and if they are then the elements and the content of the elements should be stripped. This is a very strict policy.'
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//
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// Source: https://github.com/microcosm-cc/bluemonday#usage
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var strict *bluemonday.Policy = bluemonday.StrictPolicy()
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// removeHTML strictly removes *all* recognized HTML elements from the given string.
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func removeHTML(in string) string {
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return strict.Sanitize(in)
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}
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// SanitizeHTML sanitizes risky html elements from the given string, allowing only safe ones through.
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func SanitizeHTML(in string) string {
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return regular.Sanitize(in)
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}
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// SanitizePlaintext runs text through basic sanitization. This removes
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// any html elements that were in the string, and returns clean plaintext.
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func SanitizePlaintext(in string) string {
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content := html.UnescapeString(in)
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content = removeHTML(content)
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content = html.UnescapeString(content)
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return strings.TrimSpace(content)
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}
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