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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package templates
import (
"context"
"encoding/hex"
"fmt"
"html/template"
"math"
"net/url"
"regexp"
"strings"
"unicode"
issues_model "code.gitea.io/gitea/models/issues"
"code.gitea.io/gitea/modules/emoji"
"code.gitea.io/gitea/modules/htmlutil"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/markup/markdown"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/translation"
"code.gitea.io/gitea/modules/util"
)
type RenderUtils struct {
ctx context.Context
}
func NewRenderUtils(ctx context.Context) *RenderUtils {
return &RenderUtils{ctx: ctx}
}
// RenderCommitMessage renders commit message with XSS-safe and special links.
func (ut *RenderUtils) RenderCommitMessage(msg string, metas map[string]string) template.HTML {
cleanMsg := template.HTMLEscapeString(msg)
// we can safely assume that it will not return any error, since there
// shouldn't be any special HTML.
fullMessage, err := markup.RenderCommitMessage(markup.NewRenderContext(ut.ctx).WithMetas(metas), cleanMsg)
if err != nil {
log.Error("RenderCommitMessage: %v", err)
return ""
}
msgLines := strings.Split(strings.TrimSpace(fullMessage), "\n")
if len(msgLines) == 0 {
return template.HTML("")
}
return renderCodeBlock(template.HTML(msgLines[0]))
}
// RenderCommitMessageLinkSubject renders commit message as a XSS-safe link to
// the provided default url, handling for special links without email to links.
func (ut *RenderUtils) RenderCommitMessageLinkSubject(msg, urlDefault string, metas map[string]string) template.HTML {
msgLine := strings.TrimLeftFunc(msg, unicode.IsSpace)
lineEnd := strings.IndexByte(msgLine, '\n')
if lineEnd > 0 {
msgLine = msgLine[:lineEnd]
}
msgLine = strings.TrimRightFunc(msgLine, unicode.IsSpace)
if len(msgLine) == 0 {
return ""
}
// we can safely assume that it will not return any error, since there
// shouldn't be any special HTML.
renderedMessage, err := markup.RenderCommitMessageSubject(markup.NewRenderContext(ut.ctx).WithMetas(metas), urlDefault, template.HTMLEscapeString(msgLine))
if err != nil {
log.Error("RenderCommitMessageSubject: %v", err)
return ""
}
return renderCodeBlock(template.HTML(renderedMessage))
}
// RenderCommitBody extracts the body of a commit message without its title.
func (ut *RenderUtils) RenderCommitBody(msg string, metas map[string]string) template.HTML {
msgLine := strings.TrimSpace(msg)
lineEnd := strings.IndexByte(msgLine, '\n')
if lineEnd > 0 {
msgLine = msgLine[lineEnd+1:]
} else {
return ""
}
msgLine = strings.TrimLeftFunc(msgLine, unicode.IsSpace)
if len(msgLine) == 0 {
return ""
}
renderedMessage, err := markup.RenderCommitMessage(markup.NewRenderContext(ut.ctx).WithMetas(metas), template.HTMLEscapeString(msgLine))
if err != nil {
log.Error("RenderCommitMessage: %v", err)
return ""
}
return template.HTML(renderedMessage)
}
// Match text that is between back ticks.
var codeMatcher = regexp.MustCompile("`([^`]+)`")
// renderCodeBlock renders "`…`" as highlighted "<code>" block, intended for issue and PR titles
func renderCodeBlock(htmlEscapedTextToRender template.HTML) template.HTML {
htmlWithCodeTags := codeMatcher.ReplaceAllString(string(htmlEscapedTextToRender), `<code class="inline-code-block">$1</code>`) // replace with HTML <code> tags
return template.HTML(htmlWithCodeTags)
}
// RenderIssueTitle renders issue/pull title with defined post processors
func (ut *RenderUtils) RenderIssueTitle(text string, metas map[string]string) template.HTML {
renderedText, err := markup.RenderIssueTitle(markup.NewRenderContext(ut.ctx).WithMetas(metas), template.HTMLEscapeString(text))
if err != nil {
log.Error("RenderIssueTitle: %v", err)
return ""
}
return template.HTML(renderedText)
}
// RenderLabel renders a label
func (ut *RenderUtils) RenderLabel(label *issues_model.Label) template.HTML {
locale := ut.ctx.Value(translation.ContextKey).(translation.Locale)
var extraCSSClasses string
textColor := util.ContrastColor(label.Color)
labelScope := label.ExclusiveScope()
descriptionText := emoji.ReplaceAliases(label.Description)
if label.IsArchived() {
extraCSSClasses = "archived-label"
descriptionText = fmt.Sprintf("(%s) %s", locale.TrString("archived"), descriptionText)
}
if labelScope == "" {
// Regular label
return htmlutil.HTMLFormat(`<div class="ui label %s" style="color: %s !important; background-color: %s !important;" data-tooltip-content title="%s">%s</div>`,
extraCSSClasses, textColor, label.Color, descriptionText, ut.RenderEmoji(label.Name))
}
// Scoped label
scopeHTML := ut.RenderEmoji(labelScope)
itemHTML := ut.RenderEmoji(label.Name[len(labelScope)+1:])
// Make scope and item background colors slightly darker and lighter respectively.
// More contrast needed with higher luminance, empirically tweaked.
luminance := util.GetRelativeLuminance(label.Color)
contrast := 0.01 + luminance*0.03
// Ensure we add the same amount of contrast also near 0 and 1.
darken := contrast + math.Max(luminance+contrast-1.0, 0.0)
lighten := contrast + math.Max(contrast-luminance, 0.0)
// Compute factor to keep RGB values proportional.
darkenFactor := math.Max(luminance-darken, 0.0) / math.Max(luminance, 1.0/255.0)
lightenFactor := math.Min(luminance+lighten, 1.0) / math.Max(luminance, 1.0/255.0)
r, g, b := util.HexToRBGColor(label.Color)
scopeBytes := []byte{
uint8(math.Min(math.Round(r*darkenFactor), 255)),
uint8(math.Min(math.Round(g*darkenFactor), 255)),
uint8(math.Min(math.Round(b*darkenFactor), 255)),
}
itemBytes := []byte{
uint8(math.Min(math.Round(r*lightenFactor), 255)),
uint8(math.Min(math.Round(g*lightenFactor), 255)),
uint8(math.Min(math.Round(b*lightenFactor), 255)),
}
itemColor := "#" + hex.EncodeToString(itemBytes)
scopeColor := "#" + hex.EncodeToString(scopeBytes)
return htmlutil.HTMLFormat(`<span class="ui label %s scope-parent" data-tooltip-content title="%s">`+
`<div class="ui label scope-left" style="color: %s !important; background-color: %s !important">%s</div>`+
`<div class="ui label scope-right" style="color: %s !important; background-color: %s !important">%s</div>`+
`</span>`,
extraCSSClasses, descriptionText,
textColor, scopeColor, scopeHTML,
textColor, itemColor, itemHTML)
}
// RenderEmoji renders html text with emoji post processors
func (ut *RenderUtils) RenderEmoji(text string) template.HTML {
renderedText, err := markup.RenderEmoji(markup.NewRenderContext(ut.ctx), template.HTMLEscapeString(text))
if err != nil {
log.Error("RenderEmoji: %v", err)
return ""
}
return template.HTML(renderedText)
}
// reactionToEmoji renders emoji for use in reactions
func reactionToEmoji(reaction string) template.HTML {
val := emoji.FromCode(reaction)
if val != nil {
return template.HTML(val.Emoji)
}
val = emoji.FromAlias(reaction)
if val != nil {
return template.HTML(val.Emoji)
}
return template.HTML(fmt.Sprintf(`<img alt=":%s:" src="%s/assets/img/emoji/%s.png"></img>`, reaction, setting.StaticURLPrefix, url.PathEscape(reaction)))
}
func (ut *RenderUtils) MarkdownToHtml(input string) template.HTML { //nolint:revive
output, err := markdown.RenderString(markup.NewRenderContext(ut.ctx).WithMetas(markup.ComposeSimpleDocumentMetas()), input)
if err != nil {
log.Error("RenderString: %v", err)
}
return output
}
func (ut *RenderUtils) RenderLabels(labels []*issues_model.Label, repoLink string, issue *issues_model.Issue) template.HTML {
isPullRequest := issue != nil && issue.IsPull
baseLink := fmt.Sprintf("%s/%s", repoLink, util.Iif(isPullRequest, "pulls", "issues"))
htmlCode := `<span class="labels-list">`
for _, label := range labels {
// Protect against nil value in labels - shouldn't happen but would cause a panic if so
if label == nil {
continue
}
htmlCode += fmt.Sprintf(`<a href="%s?labels=%d">%s</a>`, baseLink, label.ID, ut.RenderLabel(label))
}
htmlCode += "</span>"
return template.HTML(htmlCode)
}
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