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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/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/util"
)
// RenderCommitMessage renders commit message with XSS-safe and special links.
func RenderCommitMessage(ctx context.Context, msg, urlPrefix string, metas map[string]string) template.HTML {
return RenderCommitMessageLink(ctx, msg, urlPrefix, "", metas)
}
// RenderCommitMessageLink renders commit message as a XXS-safe link to the provided
// default url, handling for special links.
func RenderCommitMessageLink(ctx context.Context, msg, urlPrefix, urlDefault 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.RenderContext{
Ctx: ctx,
URLPrefix: urlPrefix,
DefaultLink: urlDefault,
Metas: 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 template.HTML(msgLines[0])
}
// RenderCommitMessageLinkSubject renders commit message as a XXS-safe link to
// the provided default url, handling for special links without email to links.
func RenderCommitMessageLinkSubject(ctx context.Context, msg, urlPrefix, 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 template.HTML("")
}
// we can safely assume that it will not return any error, since there
// shouldn't be any special HTML.
renderedMessage, err := markup.RenderCommitMessageSubject(&markup.RenderContext{
Ctx: ctx,
URLPrefix: urlPrefix,
DefaultLink: urlDefault,
Metas: metas,
}, template.HTMLEscapeString(msgLine))
if err != nil {
log.Error("RenderCommitMessageSubject: %v", err)
return template.HTML("")
}
return template.HTML(renderedMessage)
}
// RenderCommitBody extracts the body of a commit message without its title.
func RenderCommitBody(ctx context.Context, msg, urlPrefix string, metas map[string]string) template.HTML {
msgLine := strings.TrimRightFunc(msg, unicode.IsSpace)
lineEnd := strings.IndexByte(msgLine, '\n')
if lineEnd > 0 {
msgLine = msgLine[lineEnd+1:]
} else {
return template.HTML("")
}
msgLine = strings.TrimLeftFunc(msgLine, unicode.IsSpace)
if len(msgLine) == 0 {
return template.HTML("")
}
renderedMessage, err := markup.RenderCommitMessage(&markup.RenderContext{
Ctx: ctx,
URLPrefix: urlPrefix,
Metas: 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, these containers should have styles for "<code>" elements
func RenderCodeBlock(htmlEscapedTextToRender template.HTML) template.HTML {
htmlWithCodeTags := codeMatcher.ReplaceAllString(string(htmlEscapedTextToRender), "<code>$1</code>") // replace with HTML <code> tags
return template.HTML(htmlWithCodeTags)
}
// RenderIssueTitle renders issue/pull title with defined post processors
func RenderIssueTitle(ctx context.Context, text, urlPrefix string, metas map[string]string) template.HTML {
renderedText, err := markup.RenderIssueTitle(&markup.RenderContext{
Ctx: ctx,
URLPrefix: urlPrefix,
Metas: metas,
}, template.HTMLEscapeString(text))
if err != nil {
log.Error("RenderIssueTitle: %v", err)
return template.HTML("")
}
return template.HTML(renderedText)
}
// RenderLabel renders a label
func RenderLabel(ctx context.Context, label *issues_model.Label) template.HTML {
labelScope := label.ExclusiveScope()
textColor := "#111"
r, g, b := util.HexToRBGColor(label.Color)
// Determine if label text should be light or dark to be readable on background color
if util.UseLightTextOnBackground(r, g, b) {
textColor = "#eee"
}
description := emoji.ReplaceAliases(template.HTMLEscapeString(label.Description))
if labelScope == "" {
// Regular label
s := fmt.Sprintf("<div class='ui label' style='color: %s !important; background-color: %s !important' title='%s'>%s</div>",
textColor, label.Color, description, RenderEmoji(ctx, label.Name))
return template.HTML(s)
}
// Scoped label
scopeText := RenderEmoji(ctx, labelScope)
itemText := RenderEmoji(ctx, 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.GetLuminance(r, g, b)
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)
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)
s := fmt.Sprintf("<span class='ui label scope-parent' 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>",
description,
textColor, scopeColor, scopeText,
textColor, itemColor, itemText)
return template.HTML(s)
}
// RenderEmoji renders html text with emoji post processors
func RenderEmoji(ctx context.Context, text string) template.HTML {
renderedText, err := markup.RenderEmoji(&markup.RenderContext{Ctx: ctx},
template.HTMLEscapeString(text))
if err != nil {
log.Error("RenderEmoji: %v", err)
return template.HTML("")
}
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)))
}
// RenderNote renders the contents of a git-notes file as a commit message.
func RenderNote(ctx context.Context, msg, urlPrefix string, metas map[string]string) template.HTML {
cleanMsg := template.HTMLEscapeString(msg)
fullMessage, err := markup.RenderCommitMessage(&markup.RenderContext{
Ctx: ctx,
URLPrefix: urlPrefix,
Metas: metas,
}, cleanMsg)
if err != nil {
log.Error("RenderNote: %v", err)
return ""
}
return template.HTML(fullMessage)
}
func RenderMarkdownToHtml(ctx context.Context, input string) template.HTML { //nolint:revive
output, err := markdown.RenderString(&markup.RenderContext{
Ctx: ctx,
URLPrefix: setting.AppSubURL,
}, input)
if err != nil {
log.Error("RenderString: %v", err)
}
return template.HTML(output)
}
func RenderLabels(ctx context.Context, labels []*issues_model.Label, repoLink string) template.HTML {
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/issues?labels=%d'>%s</a> ",
repoLink, label.ID, RenderLabel(ctx, label))
}
htmlCode += "</span>"
return template.HTML(htmlCode)
}
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