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e395b4d9dc
Backport #40104 by @0xJacky Remove the `body {margin: 0; padding: 0}` reset from https://github.com/go-gitea/gitea/pull/38396, which left HTML mails flush against the edge in Apple Mail and Thunderbird. The devtest preview stops injecting its own padding, so it matches delivered mails. These clients render the mail as a document and apply the default 8px body margin again, as with GitHub and GitLab notifications. Webmail clients replace `<body>` and keep their own inset. Fixes: https://github.com/go-gitea/gitea/issues/40103 Assisted-by: Codex:GPT-6.1, Claude:Opus 5.5 Co-authored-by: Jacky <jacky-943572677@qq.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: silverwind <me@silverwind.io>
102 lines
3.3 KiB
Go
102 lines
3.3 KiB
Go
// Copyright 2025 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package devtest
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import (
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"errors"
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"io/fs"
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"net/http"
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"regexp"
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"strings"
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"gitea.dev/modules/setting"
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"gitea.dev/modules/templates"
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"gitea.dev/modules/util"
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"gitea.dev/services/context"
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"gitea.dev/services/mailer"
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"go.yaml.in/yaml/v4"
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)
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var mailDarkSchemeQuery = regexp.MustCompile(`@media\s*\(\s*prefers-color-scheme\s*:\s*dark\s*\)`)
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func mailPreviewMockData(tmplName string) (map[string]any, error) {
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mockData := map[string]any{}
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mockDataContent, err := templates.AssetFS().ReadFile(tmplName + ".devtest.yml")
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if err != nil {
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if errors.Is(err, fs.ErrNotExist) {
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return mockData, nil
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}
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return nil, err
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}
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return mockData, yaml.Unmarshal(mockDataContent, &mockData)
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}
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func MailPreviewRender(ctx *context.Context) {
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tmplName := ctx.PathParam("*")
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mockData, err := mailPreviewMockData(tmplName)
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if err != nil {
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http.Error(ctx.Resp, "Failed to parse mock data: "+err.Error(), http.StatusInternalServerError)
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return
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}
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mockData["locale"] = ctx.Locale
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var mailBody strings.Builder
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if err := mailer.LoadedTemplates().BodyTemplates.ExecuteTemplate(&mailBody, tmplName, mockData); err != nil {
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http.Error(ctx.Resp, err.Error(), http.StatusInternalServerError)
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return
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}
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body := mailBody.String()
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// emulate mail clients, which resolve "cid:" URIs to the mail's inline attachments
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body = strings.ReplaceAll(body, `src="cid:`, `src="`+setting.AppSubURL+`/devtest/mail-preview-embed/`)
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// a page can force "color-scheme" on an embedded document but never "prefers-color-scheme"
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if scheme := ctx.FormString("scheme"); scheme == "light" || scheme == "dark" {
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body = mailDarkSchemeQuery.ReplaceAllString(body, util.Iif(scheme == "dark", "@media all", "@media not all"))
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body = strings.Replace(body, "</head>", "<style>:root {color-scheme: "+scheme+"}</style></head>", 1)
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}
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// fragment templates like "mail/base/head" would be sniffed as text/plain otherwise
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ctx.Resp.Header().Set("Content-Type", "text/html; charset=utf-8")
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_, _ = ctx.Resp.Write([]byte(body))
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}
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func MailPreviewEmbed(ctx *context.Context) {
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content, err := mailer.LoadMailIcon(ctx.PathParam("*"))
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if err != nil {
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ctx.NotFound(err)
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return
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}
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ctx.Resp.Header().Set("Content-Type", "image/png")
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_, _ = ctx.Resp.Write(content)
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}
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func prepareMailPreviewRender(ctx *context.Context, tmplName string) {
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subject := "(default subject)"
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if mockData, err := mailPreviewMockData(tmplName); err == nil {
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if mockSubject, ok := mockData["Subject"].(string); ok {
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subject = util.IfZero(mockSubject, subject)
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}
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}
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tmplSubject := mailer.LoadedTemplates().SubjectTemplates.Lookup(tmplName)
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// FIXME: MAIL-TEMPLATE-SUBJECT: only "issue" related messages support using subject from templates
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if tmplSubject != nil {
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var buf strings.Builder
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err := tmplSubject.Execute(&buf, nil)
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if err != nil {
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subject = "ERROR: " + err.Error()
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} else {
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subject = util.IfZero(buf.String(), subject)
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}
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}
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ctx.Data["RenderMailSubject"] = subject
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ctx.Data["RenderMailTemplateName"] = tmplName
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}
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func MailPreview(ctx *context.Context) {
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ctx.Data["MailTemplateNames"] = mailer.LoadedTemplates().TemplateNames
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tmplName := ctx.FormString("tmpl")
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if tmplName != "" {
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prepareMailPreviewRender(ctx, tmplName)
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}
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ctx.HTML(http.StatusOK, "devtest/mail-preview")
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}
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