mirror of
https://github.com/Rain-kl/OpenFlare.git
synced 2026-09-29 22:06:38 +08:00
ryan
68d8f786cc
Wire origin error page into OpenResty proxy route rendering: ConfigSnapshot fields, default HTML template SupportFile, proxy_intercept_errors + error_page with status-preserving internal Lua location, and Agent placeholder substitution for __OPENFLARE_ERROR_PAGE_TMPL__. Pages routes are excluded.
173 lines
5.2 KiB
Go
173 lines
5.2 KiB
Go
package openresty
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import (
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"fmt"
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"strconv"
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"strings"
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)
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const (
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// OriginErrorPageSupportPath is the SupportFile path for the origin error HTML template.
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OriginErrorPageSupportPath = "error_pages/origin_error.html.tmpl"
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// OriginErrorPageInternalLocation is the internal nginx location that serves the error body.
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OriginErrorPageInternalLocation = "/__openflare_origin_error"
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defaultOriginErrorPageStatusTag = "500-599"
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)
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// DefaultOriginErrorPageHTML is the built-in Cloudflare-style origin error page.
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// Placeholders {{status}} and {{host}} are substituted at request time by Lua.
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const DefaultOriginErrorPageHTML = `<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>{{status}} | 源站暂时无法提供服务</title>
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<style>
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:root { color-scheme: light dark; }
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* { box-sizing: border-box; }
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body {
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margin: 0;
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min-height: 100vh;
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display: flex;
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align-items: center;
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justify-content: center;
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
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background: #f6f7f9;
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color: #1f2937;
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}
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@media (prefers-color-scheme: dark) {
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body { background: #0f1419; color: #e5e7eb; }
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.card { background: #1a2332; border-color: #2d3a4d; box-shadow: none; }
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.status { color: #f3f4f6; }
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.muted { color: #9ca3af; }
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.host { background: #243044; color: #d1d5db; }
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}
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.card {
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width: min(32rem, calc(100% - 2rem));
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padding: 2.5rem 2rem;
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border-radius: 12px;
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background: #fff;
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border: 1px solid #e5e7eb;
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box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
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text-align: center;
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}
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.status {
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margin: 0;
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font-size: clamp(3.5rem, 12vw, 5.5rem);
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font-weight: 700;
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letter-spacing: -0.04em;
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line-height: 1;
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color: #111827;
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}
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h1 {
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margin: 1rem 0 0.5rem;
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font-size: 1.25rem;
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font-weight: 600;
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}
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p { margin: 0.4rem 0; line-height: 1.6; }
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.muted { color: #6b7280; font-size: 0.95rem; }
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.host {
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display: inline-block;
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margin-top: 1.25rem;
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padding: 0.35rem 0.75rem;
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border-radius: 999px;
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background: #f3f4f6;
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color: #374151;
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font-size: 0.85rem;
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font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
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word-break: break-all;
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}
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</style>
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</head>
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<body>
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<main class="card" role="main">
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<p class="status" aria-label="HTTP status">{{status}}</p>
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<h1>源站暂时无法提供服务</h1>
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<p class="muted">网关已拦截源站错误响应。请稍后重试；若问题持续，请联系站点管理员。</p>
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<p class="host">{{host}}</p>
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</main>
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</body>
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</html>
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`
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// EffectiveOriginErrorPageHTML returns custom HTML when set, otherwise the built-in default.
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func EffectiveOriginErrorPageHTML(cfg ConfigSnapshot) string {
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if strings.TrimSpace(cfg.OriginErrorPageHTML) == "" {
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return DefaultOriginErrorPageHTML
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}
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return cfg.OriginErrorPageHTML
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}
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func effectiveOriginErrorPageStatusTags(cfg ConfigSnapshot) []string {
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if len(cfg.OriginErrorPageStatusCodes) == 0 {
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return []string{defaultOriginErrorPageStatusTag}
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}
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return cfg.OriginErrorPageStatusCodes
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}
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func originErrorPageSupportFile(cfg ConfigSnapshot) SupportFile {
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return SupportFile{
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Path: OriginErrorPageSupportPath,
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Content: EffectiveOriginErrorPageHTML(cfg),
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}
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}
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func renderOriginErrorPageIntercept(cfg ConfigSnapshot) string {
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if !cfg.OriginErrorPageEnabled {
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return ""
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}
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if _, err := ExpandStatusCodeTags(effectiveOriginErrorPageStatusTags(cfg)); err != nil {
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return ""
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}
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return " proxy_intercept_errors on;\n"
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}
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// renderOriginErrorPageServerBits emits server-level error_page + internal location.
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// Returns empty string when disabled, expand fails, or no codes remain.
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func renderOriginErrorPageServerBits(cfg ConfigSnapshot) string {
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if !cfg.OriginErrorPageEnabled {
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return ""
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}
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codes, err := ExpandStatusCodeTags(effectiveOriginErrorPageStatusTags(cfg))
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if err != nil || len(codes) == 0 {
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return ""
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}
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parts := make([]string, len(codes))
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for i, code := range codes {
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parts[i] = strconv.Itoa(code)
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}
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var builder strings.Builder
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fmt.Fprintf(&builder, " error_page %s = %s;\n", strings.Join(parts, " "), OriginErrorPageInternalLocation)
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builder.WriteString(renderOriginErrorPageInternalLocation())
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return builder.String()
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}
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func renderOriginErrorPageInternalLocation() string {
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return fmt.Sprintf(` location = %s {
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internal;
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default_type text/html;
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charset utf-8;
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content_by_lua_block {
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local f = io.open("%s", "r")
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if not f then
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ngx.status = ngx.status
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ngx.say("Error ", ngx.status)
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return
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end
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local body = f:read("*a")
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f:close()
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local status = tostring(ngx.status)
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local host = ngx.var.host or ""
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body = body:gsub("{{status}}", status, 1)
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body = body:gsub("{{host}}", host, 1)
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body = body:gsub("{{status}}", status)
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body = body:gsub("{{host}}", host)
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ngx.header["Content-Type"] = "text/html; charset=utf-8"
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ngx.say(body)
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}
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}
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`, OriginErrorPageInternalLocation, ErrorPageTmplPlaceholder)
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}
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